JP7149983B2 - Products containing base films, composite films, and composite films - Google Patents

Description

<Related application>
This application claims priority to a Chinese patent application entitled "Radiative Cooling Film, Radiative Cooling Composite Film, Radiative Cooling Product", filed on December 31, 2019, with Application No. 201911425218.0, and 2020 It claims priority from a Chinese patent application entitled "Radiative Cooling Film", application number 202010076462.7, filed on Jan. 23, 2009, the entire content of which is incorporated herein by reference. .

TECHNICAL FIELD The present application relates to the technical field of energy saving, and in particular to base films, composite films, and products containing composite films.

In the field of energy-saving technology, a film with radiative cooling function is usually attached to the surface of an object to reflect sunlight and transmit heat to outer space by radiating infrared rays in the wavelength range of windows in the atmosphere. to achieve the purpose of temperature reduction. However, the conventional thin film with radiative cooling function is usually made of a single polymer material, or a small amount of filler is added to the polymer material, and the haze is only around 1%, which is applied to the reflective layer. If so, the specular reflection is noticeable and tends to cause light pollution.

According to various embodiments of the present application, base films, composite films, and products including composite films are provided.

The base film includes a first layer and a first filler dispersed in the first layer, wherein n (1.3-1.7) is a refractive index of the material of the first layer, and where m is the refractive index and x is the difference between n and m, the absolute value of x is 0.0005 or more, and the base film has an emissivity of 80% or more at an atmospheric window of 7 μm to 14 μm, It has a heat reflectance of 10% or more in a wavelength range of 300 nm to 2500 nm and a glossiness of 20 GU or less.

In the above base film, by adjusting the refractive index relationship between the material of the first layer and the first filler, the incident light entering the inside of the base film can be refracted multiple times in the base film, thereby reducing the haze of the base film. can achieve the purpose of increasing , and further reduce the glossiness of the base film to avoid or reduce the occurrence of light pollution. It also ensures a high emissivity of the base film and an excellent temperature reduction effect.

In one embodiment, the base film further comprises a second layer and a third layer provided on opposite sides of the first layer, wherein the first layer, the second layer and the third layer are co-extruded, the thickness ratio of said second layer and said first layer is 1:1-1:20, and the thickness ratio of said third layer and said first layer is 1:1-1:20 is.

In one embodiment, the material of the first layer comprises at least one of polyesters, polyacrylates, polyamides, polyurethanes, polyolefins, fluoroplastics.

In one embodiment, the polyesters include at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene terephthalate glycol, polyethylene terephthalate-1,4-cyclohexanedimethanol ester, and the polyacrylates are acrylonitrile. -butadiene-styrene plastic, polymethyl methacrylate, said polyamides including at least one of nylon 6, nylon 66, nylon 12, nylon 1010, said polyolefins comprising polyethylene, polypropylene, At least one of poly(4-methyl-1-pentene) is included, and the fluororesin is selected from tetrafluoroethylene-hexafluoropropylene copolymer, polyvinylidene fluoride, and ethylene-chlorotrifluoroethylene copolymer. At least one type is included.

In one embodiment, both the material of the second layer and the material of the third layer are the same as the material of the first layer.

In one embodiment, the first filler includes at least one of an organic filler and an inorganic filler, and the mass percentage of the first filler in the first layer is 2%-20%.

In one embodiment, the first filler is an organic filler, the absolute value of x is greater than or equal to 0.05, and the mass percentage of the first filler in the first layer is 2%-5%. , the organic filler includes at least one of polyacrylate particles, polystyrene particles, polyurethane particles, polymethyl methacrylate particles, and epoxy resin particles.

In one embodiment, the melting point of the organic filler is higher than the melting point of the material of the first layer.

In one embodiment, the organic filler is a hollow filler.

In one embodiment, the first filler is an inorganic filler, the mass percentage of the first filler in the first layer is 3% or more, and the inorganic filler is titanium nitride particles, titanium dioxide particles, It contains at least one of silicon carbide particles, silica particles, barium sulfate particles, calcium sulfate particles, and calcium carbonate particles.

In one embodiment, the first layer includes cells.

In one embodiment, the particle size of the first filler is 1 μm-20 μm.

In one embodiment, the thickness of the first layer is 25 μm or more, and the thickness of each of the second layer and the third layer is 5 μm or more.

In one embodiment, the second layer further comprises a second filler dispersed therein, wherein the mass percentage of the second filler in the second layer is 0.5%-2% and/or the third A third filler is further dispersed in the layer, and the weight percentage of said third filler in said third layer is 0.5%-2%.

In one embodiment, the light transmittance of the second layer is 82% or more, the water vapor transmission rate of the second layer is 10 g/(m ² ·24 h) or less, and/or the third layer The light transmittance is 82% or more, and the water vapor transmission rate of the third layer is 10 g/(m ² ·24 h) or less.

In one embodiment, the second layer further includes an ultraviolet absorber, the second layer has an ultraviolet blocking rate of 80% or more, and the second layer further includes an antioxidant. The sum of the mass percentages of the antioxidant and the UV absorber in is 0.5%-4%.

In one embodiment, the base film has a light transmittance of 82% or more.

The composite film includes the base film, a reflective film, a second adhesive layer, and a substrate layer laminated in order on the base film, and the composite film has a glossiness of 70 GU or less, It has an emissivity of 80% or more at a 14 μm atmospheric window and a heat reflectance of 85% or more in the wavelength range of 300 nm to 2500 nm.

Based on the above base film, the reflective film can be combined to provide the resulting composite film with excellent reflectance and further improve the temperature reduction effect. Therefore, when the composite film is applied to the fields of energy-saving building materials, photovoltaic industry, outdoor products, etc., it not only has excellent temperature reduction effect, but also has low glossiness, effectively avoiding or reducing the occurrence of light pollution. be able to.

In one embodiment, the material of the reflective film is metallic material and/or ceramic material.

The product including the composite film includes a substrate, and a first adhesive layer and a composite film laminated in order on the surface of the substrate.

The product containing the above composite film has excellent temperature lowering effect, low glossiness, and can effectively avoid or reduce the occurrence of light pollution.

In one embodiment, the substrate comprises at least one of metal, plastic, glass, rubber, pitch, cement, fabric.

Reference may be made to one or more of the accompanying drawings to better describe and illustrate the inventive embodiments and/or examples disclosed herein. Additional details or examples used to explain the accompanying drawings limit the scope of the disclosed invention, the presently described embodiments and/or examples, and one of the best modes of understanding these inventions. should not be considered as
1 is a structural schematic diagram of a first embodiment of a base film of the present application; FIG. FIG. 4 is a structural schematic diagram of the second embodiment of the base film of the present application; FIG. 3 is a structural schematic diagram of the third embodiment of the base film of the present application; 1 is a structural schematic diagram of a composite film of the present application; FIG. 1 is a structural schematic diagram of a product containing the composite film of the present application; FIG. FIG. 4 is a comparison diagram of a temperature test of the central portion of the high-voltage cabinet in the box-type electric transformer of Industrial Application Example 1 of the present application; FIG. 4 is a comparison diagram of a temperature test of the central portion of the box type electric transformer of Industrial Application Example 1 of the present application. FIG. 4 is a comparison diagram of the temperature test of the central part of the low-voltage distribution cabinet in the box-type electric transformer of Industrial Application Example 1 of the present application; It is a schematic diagram of the model house of the industrial application example 2 of this application. It is a comparison diagram of the temperature test of the industrial application example 2 of this application.

The base films, composite films, and products containing the composite films provided by the present application are further described below.

In the present application, gloss measurements are based on surface reflection of light using polished glass as a reference standard. Light reflected from a surface depends on the angle of incidence and the nature of the surface. Gloss is classified as low gloss, semi-gloss or high gloss.

In this application, we test the gloss of each product or sample according to the national standard GB/T13891-2008, test the sample at 60° geometric condition, and if the test result is greater than 70GU, 20° geometric further test in scientific conditions to improve its resolution. Accordingly, if the test result is less than 10 GU, further test at 85° geometric condition to improve its resolution. If the sample is tested at 60° geometry and the result is 10GU-70GU, it is called "semi-gloss" and if the result is less than 10GU, it is called "low gloss" and the result is less than 70GU. If it is large, it is called "high gloss".

As shown in FIG. 1 , the base film 21 of the first embodiment provided by the present application includes a first layer 211 and a first filler 212 dispersed in the first layer 211 . If the refractive index of the material of the first layer 211 is n (1.3-1.7), the refractive index of the first filler 212 is m, and the difference between n and m is x, the absolute value of x is 0. 0.0005 or greater. The base film 21 has an emissivity of 80% or more at an atmospheric window of 7 μm to 14 μm, a heat reflectance of 10% or more in a wavelength range of 300 nm to 2500 nm, and a glossiness of 20 GU or less.

The refractive index n of the material of the first layer 211 may be larger than the refractive index m of the first filler 212 or smaller than the refractive index m of the first filler 212. The value must be greater than or equal to 0.0005.

Therefore, by adjusting the refractive index relationship between the material of the first layer 211 and the first filler 212, the incident light entering the inside of the base film 21 can be refracted multiple times in the base film 21, thereby The purpose of increasing the haze of the film 21 can be achieved, and the glossiness of the base film 21 can be reduced to avoid or reduce the occurrence of light pollution. In addition, a high emissivity of the base film 21 and an excellent temperature lowering effect can be guaranteed.

In one or more embodiments, by further selecting the refractive index relationship between the material of the first layer 211 and the first filler 212, the matching effect is better, and the glossiness of the base film 21 is 9 GU- It becomes 20 GU.

From the viewpoint of the light transmittance, emissivity, film-forming property, etc. of the base film 21, the material of the first layer 211 is at least one of polyesters, polyacrylates, polyamides, polyurethanes, polyolefins, and fluororesins. Contains seeds. Specifically, polyesters include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyethylene terephthalate glycol (PETG), and polyethylene terephthalate-1,4-cyclohexanedimethanol ester (PCTG). Polyacrylates include at least one of acrylonitrile-butadiene-styrene plastic (ABS) and polymethyl methacrylate (PMMA), and polyamides include nylon 6 (PA6), nylon 66 (PA66 ), nylon 12 (PA12), nylon 1010 (PA1010), and polyolefins are polyethylene (PE), polypropylene (PP), poly (4-methyl-1-pentene) (TPX) , and the fluororesin includes at least one of tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polyvinylidene fluoride (PVDF), and ethylene-chlorotrifluoroethylene copolymer (ECTFE). include.

In one or more embodiments, the first filler 212 includes at least one of an organic filler and an inorganic filler, and the weight percentage in the first layer 211 is 2%-20%.

In one or more embodiments, the first filler 212 is an organic filler, the absolute value of x is greater than or equal to 0.05, and the greater the x, the greater the ability to refract incident light and reduce the haze. increase becomes more pronounced.

In one or more embodiments, the organic filler comprises at least one of polyacrylate particles, polystyrene particles, polyurethane particles, polymethylmethacrylate particles, epoxy resin particles.

Considering that the haze limit of the base film 21 is 90%-95%, if the content of the organic filler in the base film 21 is too high, the haze of the base film 21 will be significantly increased and the Affects surface roughness and light transmittance. Moreover, if the content of the organic filler is too high, the workability of the base film 21 is also affected. Therefore, the weight percentage of the organic filler in the base film 21 is 2%-5%.

In one or more embodiments, the base film 21 is manufactured by a melt mixing method, and the specific steps include mixing the material of the first layer 211 and the organic filler in a mixing device to melt and mix. The base film 21 is manufactured.

In addition, in the base film 21, since light rays are refracted at the base film 21 multiple times, the organic filler must exist in the form of particles. Therefore, the melting point of the organic filler should be higher than the melting point of the material of the first layer 211 in order to ensure that the organic filler does not melt when the base film 21 is manufactured by the melt mixing method.

Specifically, the melt-mixing temperature must satisfy (1) that the material of the first layer 211 can be completely melted but not decomposed, and (2) that the organic filler is not melted.

Molecular materials are selected as much as possible for the material of the first layer 211 and the organic filler so as to simultaneously satisfy the relationship between the refractive index and the melting point. However, in the polymer material, it is affected by factors such as molecular weight, degree of polymerization, etc., or after modifying the polymer material, the polymer material of the same monomer can also be the material of the first layer 211 in this application and the organic filler. The material of the first layer 211 and the organic filler can also be selected from the same monomer polymer material if the relationship between the modulus and the melting point is satisfied.

In one or more embodiments, if the organic filler is a hollow filler, incident light can be refracted multiple times when passing through the organic filler, thereby further increasing the haze of the base film 21; The glossiness of the base film 21 is further reduced.

Similarly, if the first layer 211 contains cells, the incident light will be refracted multiple times in the first layer 211, which can further increase the haze of the base film 21 and reduce the glossiness.

In one or more embodiments, the cell size is 2 μm-6 μm, preferably 3 μm-5 μm.

In one or more embodiments, the cells are obtained by adding a pore-forming agent during the manufacturing process, the pore-forming agent comprising a readily degradable material such as ammonium carbonate, ammonium bicarbonate, etc., which decomposes during melt mixing. And the cells are reserved in the first layer 211 .

In one or more embodiments, first filler 212 is an inorganic filler and the absolute value of x is greater than 0.2.

In one or more embodiments, the inorganic filler includes at least one of titanium nitride particles, titanium dioxide particles, silicon carbide particles, silica particles, barium sulfate particles, calcium sulfate particles, calcium carbonate particles.

When the first filler 212 in the first layer is an inorganic filler, the ability of the incident light to refract in the first layer is higher than the organic filler, but the incident light cannot pass through the inorganic filler, thereby Since the scattered light in the base film 21 is reduced and the haze is the ratio of the scattered light to the luminous flux, the degree of increase in the haze of the base film 21 is correspondingly attenuated.

To ensure the haze of the base film 21, in one or more embodiments, the weight percentage of the inorganic filler in the base film 21 is 3% or more, and the haze of the base film 21 is 35% or more. Furthermore, the mass percentage of the inorganic filler in the base film 21 is preferably 5% or more so that the base film 21 has a haze of 50% or more.

When the haze of the base film 21 is increased by increasing the mass percentage of the inorganic filler, the heat absorption of the base film 21 is reduced, thereby reflecting more heat and increasing the reflectance. The light transmittance at 21 must be 82% or more.

However, if the content of the inorganic filler is too high, the fluidity of the substrate material is affected, and the film-forming properties of the first layer 211 are considered to be reduced. More preferably 5%-20%.

In addition, when the amount of the first filler 212 added is high, particularly when the first filler 212 is an inorganic filler, the mechanical properties of the base film 21, especially the impact resistance, are lowered, and the base film 21 is in the process of being processed. It is easy to break easily, the processing difficulty is high, and the manufacturing efficiency is low. The main reason for this is that if the materials of the first filler 212 and the first layer 211 are incompatible, defects will occur in the base film 21 during the processing process, and cracks will occur during the rapid stretching process. That is, the base film 21 breaks. In particular, when the amount of the first filler 212 added is 5% or more, the problem that the base film 21 breaks during the processing process becomes serious.

On the other hand, as shown in FIG. 2, the base film 21 of the second embodiment provided by the present application has second layers provided on both opposing surfaces of the first layer 211 based on the first embodiment. 213 and a third layer 215, wherein the first layer 211, the second layer 213 and the third layer 215 are co-extruded.

To enable the first layer 211, the second layer 213, and the third layer 215 to be primarily coextruded, the material of the second layer 213, the material of the third layer 215, and the material of the first layer 211 are all are the same.

Therefore, the first layer 211 is the main functional layer of the base film 21 and determines the radiative cooling effect and haze of the base film 21 . The second layer 213 and the third layer 215 support the first layer 211 during the coextrusion process, improve the mechanical properties of the base film 21, and ensure that the base film 21 does not break during the process. do.

It should be noted that the first layer 211 still cracks during the co-extrusion process, but the second layer 20 and the third layer 30 do not crack, supporting the first layer 211 during the rapid drawing process. .

It can be understood that the material of the first layer 211 and the first filler 212 are first granulated in order to evenly distribute the first filler 212 in the first layer 211 .

The selection of the thicknesses of the second layer 213 and the third layer 215 is such that the second layer 213 and the third layer 215 sufficiently support the first layer 211 without affecting the performance of the base film 21. It can be varied independently by changing the thickness of 211 . They are within the range of 1:1-1:20, preferably within the range of 1:1.5-1:20, respectively.

Considering that if the first layer 211 is too thin, the haze and radiative cooling effect of the base film 21 are not greatly improved, the thickness of the first layer 211 is preferably 25 μm or more. On the other hand, if the first layer 211 is too thick, the flexibility of the base film 21 is affected, and creases are likely to occur during use, thus affecting the effect. Therefore, the thickness of the first layer 211 is more preferably 25 μm-100 μm.

Accordingly, if the second layer 213 and the third layer 215 are too thin, the effect of supporting the first layer 211 cannot reach a better state, so the thickness of the second layer 213 and the third layer 215 are both It is preferably 5 μm or more. On the other hand, when the second layer 213 and the third layer 215 have a predetermined thickness, the effect of supporting the first layer 211 does not improve so much, but the radiative cooling effect and flexibility of the base film 21 are affected. The thickness of the layer 213 and the third layer 215 is more preferably 5 μm-25 μm, and the thickness ratio with the first layer 211 is in the range of 1:1-1:20, preferably 1:1.5-1:20. It is in the range of 1:20.

In addition, the second layer 213 and the third layer 215 co-extruded in the present application play a role of covering the surface roughness of the first layer 211 . Specifically, the addition of the first filler 212 causes the surface roughness of the first layer 211 to be around 0.8 μm, and further increases with an increase in the amount of the first filler 212 added. 213 and the third layer 215, the surface roughness of the base film 21 is reduced to around 0.04 μm, thereby providing excellent processability and appearance during subsequent processing steps such as coating. provides the base film 21 with the advantages of

The surface roughness of first layer 211 is further related to the grain size of first filler 212 . It can be understood that the surface roughness of the first layer 211 increases as the particle size of the first filler 212 increases. However, the smaller the particle size of the first filler 212, the more likely it is to agglomerate in the first layer 211, reducing the effect of increasing the haze. Therefore, the particle size of the first filler is preferably 0.1 μm-20 μm, more preferably 0.5 μm-10 μm, even more preferably 2 μm-6 μm, even more preferably 3 μm-5 μm.

It should be noted that the particle size of the first filler 212 in the present application is the average particle size.

In one or more embodiments, the first filler 212 is a mixture of organic and inorganic fillers, which combine the advantages of these two to improve the base film 21 while also improving the reflectance of the base film 21 . and increase emissivity.

As shown in FIG. 3, the base film 21 of the third embodiment provided by the present application also has a second filler 214 dispersed in the second layer 213 according to the second embodiment, and the second filler 214 is A blocking net is formed on the second layer 213 to block and extend the passage of moisture entering the first layer 211, thereby effectively blocking moisture penetration and extending the service life of the base film 21. .

In one or more embodiments, the third layer 215 is further dispersed with a third filler 216 to also form an isolation net in the third layer 215 and further extend the service life of the base film 21 .

Of course, the second filler 214 and the third filler 216 block the penetration of moisture into the first layer 211 and also prevent part of the light from entering the first layer 211 through the second layer 213 . block and affect the radiative cooling effect of the base film 21 . Therefore, in order to balance the two, the second layer 213 and the third layer 215 are controlled by controlling the addition amount of the second filler 214 and the third filler 216 and the conditions such as the shielding net formed dispersedly. The light transmittance of 82% or more and the water vapor transmission rate of 10 g/(m ² ·24 h) or less.

In an actual processing step, preferably, by controlling the addition amount of the second filler 214 and the third filler 216, the light transmittance and the water vapor transmission rate of the second layer 213 and the third layer 215 are controlled, and the processing is performed. Reduce difficulty. In addition, in order to ensure the surface roughness of the second layer 213 and the third layer 215, the mass percentage of the second filler 214 in the second layer 213 and the mass percentage of the third filler 216 in the third layer 215 are both Preferably 0.5%-2%.

In one or more embodiments, second filler material 214 and third filler material 216 are at least one of nanoscale aluminum hydroxide particles, calcium hydroxide particles, zirconium oxide particles, cerium oxide particles, and alumina particles. and the shape is at least one of sheet-like and rod-like, preferably sheet-like. Additionally, the size of the second filler 214 and the third filler 216 are independently selected from 10 nm-750 nm.

Similarly, the material of the second layer 213 and the third filler 216 may be uniformly distributed in the second layer 213 and the third filler 216 in the third layer 215 during the processing steps. Two fillers 214 need to be granulated, and third layer 215 material and third filler 216 need to be granulated.

Therefore, when using the base film 21, the second layer 213 or the third layer 215 can be optionally selected as the irradiation surface.

In one or more embodiments, the second layer 213 further includes a UV absorber, and the UV absorber is controlled to make the UV blocking rate of the second layer 213 80% or more, and prevent photoaging of the base film 21. is suppressed, and further, the second layer 213 blocks ultraviolet light by 90% or more.

In addition, the second layer 213 may further include an antioxidant to enhance the UV blocking rate of the second layer 213 together with the UV absorber. Specifically, the sum of the weight percentages of the antioxidant and UV inhibitor in the second layer 213 is 0.5%-4%.

In addition, the second layer 213 may include the second filler 214, the UV absorber, and the antioxidant at the same time. At this time, when the base film 21 is used, the second layer 213 is used as the irradiation surface.

As shown in FIG. 4, the composite film 2 provided by the present application includes the base film 21, a reflective film 22 laminated on the base film 21 in order, a second adhesive layer 23 and a base layer 24. The composite film 2 has a glossiness of 70 GU or less, an emissivity of 80% or more at an atmospheric window of 7 μm-14 μm, and a heat reflectance of 85% or more in a wavelength range of 300 nm-2500 nm.

In one or more embodiments, the change in gloss of base film 21 results in a gloss of composite film 2 of 50 GU or less. Therefore, based on the base film 21, the composite film 2 with excellent radiative cooling effect and low surface roughness can be obtained.

In some preferred embodiments, the glossiness of the base film 21 varies so that the composite film 2 has a glossiness of 30 GU or less, specifically, the preferred glossiness of the composite film 2 is 10GU-30GU.

In one or more embodiments, the thickness of the reflective film 22 is 50 nm-400 nm, the thickness of the base layer 24 is 15 μm-50 μm, and the thickness of the second adhesive layer 2 is 2 μm-15 μm.

In one or more embodiments, the material of reflective film 22 is a metallic material and/or a ceramic material. The metal material is at least one of silver, silver alloys, aluminum, aluminum alloys, gold, gold alloys, copper, copper alloys, and the ceramic material is metal oxides, metal nitrides, non-metal nitrides, semiconductor doping compounds. wherein the metal oxide includes at _{least one} of _Y2O3 , ZnO, SnO, _Ta2O5 , _{Nb2O5 , ZrO2} , _HfO2 , and the metal nitride is Ti ₃ N ₄ , AlN, the non-metallic nitride comprising Si ₃ N ₄ , and the semiconductor doping compound comprising at least one of AZO, ITO, IZO, ZTO, GZO.

In one or more embodiments, the material of substrate layer 24 is polyethylene naphthalate, polycyclohexanedimethylene terephthalate, polyethylene terephthalate glycol, polyethylene terephthalate-acetic acid ester, polycarbonate, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene. It contains at least one of terpolymer, polyvinyl chloride, ethylene propylene rubber, polyolefin, polyamide, ethylene-vinyl acetate copolymer, and ethylene-methyl acrylate copolymer.

As shown in FIG. 5, a product including a composite film provided by the present application includes a substrate 1, a first adhesive layer 3 and a composite film 2 which are laminated in order on the surface of the substrate 1, and the composite film 2 The base material layer 24 in is attached to the first adhesive layer 3 .

Substrate 1 includes at least one of metal, plastic, glass, rubber, pitch, cement, and fabric.

In one or more embodiments, the materials of the first adhesive layer 3 and the second adhesive layer 23 are ethylene acrylic acid copolymer, ethylene-vinyl acetate copolymer, polymethyl methacrylate, maleic anhydride graft, Hydrogenated styrene-butadiene block copolymer, styrene-isoprene-styrene block copolymer, polystyrene/butadiene copolymer, polyurethane, hydrogenated petroleum resin, rosin resin, ethylene-butene copolymer, ethylene-octene copolymer , polyurethanes, polyacrylates, organosilicones, rubbers, and epoxy resins.

Therefore, in accordance with the test standard of the national standard GB/T13891-2008, the product containing the composite film 2 has a semi-gloss level, which effectively reduces the light pollution of the product in the use process, and also has a radiative cooling effect. Excellent.

The following specific examples further illustrate the base film, the composite film, and the products comprising the composite film.

Example 1
In the base film of this example, the material of the first layer is PMMA, and the first filler is PS microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.49, the refractive index m of the first filler is 1.58 and the absolute value of the refractive index difference x is 0.09. The thickness of the base film is 50 μm, and the first filler in the base film has a particle size of 3 μm and a mass percentage of 2%.

Example 2
In the base film of this example, the material of the first layer is PETG and the first filler is PMMA microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.48 and the absolute value of the refractive index difference x is 0.06. The base film has a thickness of 50 μm, and the first filler in the base film has a particle size of 5 μm and a mass percentage of 5%.

Example 3
In the base film of this example, the material of the first layer is PETG and the first filler is polyacrylate microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.43 and the absolute value of the refractive index difference x is 0.11. The base film has a thickness of 50 μm, and the first filler in the base film has a particle size of 3 μm and a mass percentage of 3%.

Example 4
In the base film of this example, the material of the first layer is PMMA, and the first filler is PS microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.49, the refractive index m of the first filler is 1.59 and the absolute value of the refractive index difference x is 0.10. The thickness of the base film is 50 μm, and the first filler in the base film has a particle size of 3 μm and a mass percentage of 2%.

Example 5
In the base film of this example, the material of the first layer is PETG and the first filler is PMMA microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.48 and the absolute value of the refractive index difference x is 0.06. The base film has a thickness of 25 μm, and the first filler in the base film has a particle size of 3 μm and a mass percentage of 3%.

Example 6
In the base film of this example, the material of the first layer is PETG and the first filler is PMMA microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.48 and the absolute value of the refractive index difference x is 0.06. The base film has a thickness of 75 μm, and the first filler in the base film has a particle size of 3 μm and a mass percentage of 3%.

Example 7
In the base film of this example, the material of the first layer is PETG and the first filler is PMMA microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.48 and the absolute value of the refractive index difference x is 0.06. The base film has a thickness of 100 μm, and the first filler in the base film has a particle size of 3 μm and a mass percentage of 3%.

Example 8
In the base film of this example, the material of the first layer is PETG and the first filler is PMMA microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.48 and the absolute value of the refractive index difference x is 0.06. The thickness of the base film is 50 μm, the first filler in the base film has a particle size of 3 μm and a mass percentage of 3%, and the base film contains cells of 3 μm size.

Example 9
In the base film of this example, the material of the first layer is PETG and the first filler is PMMA microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.48 and the absolute value of the refractive index difference x is 0.06. The thickness of the base film is 50 μm, the first filler in the base film has a particle size of 3 μm, a mass percentage of 3%, and the first filler is a hollow filler.

Example 10
In the base film of this example, the material of the first layer is PETG and the first filler is PMMA microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.48 and the absolute value of the refractive index difference x is 0.06. The thickness of the base film is 50 μm, the first filler in the base film has a particle size of 3 μm, the mass percentage is 3%, the first filler is a hollow filler, and the base film further has a size of 3 μm. cells are included.

Example 11
In the base film of this example, the material of the first layer is PETG and the first filler is polyacrylate microspheres, which are manufactured by melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.43 and the absolute value of the refractive index difference x is 0.11. The thin film has a thickness of 15 μm, and the first filler in the thin film has a particle size of 3 μm and a mass percentage of 3%.

Comparative example 1
The material of the base film of this comparative example is 100% PETG, and the thickness is 50 μm.

Comparative example 2
In the base film of this comparative example, the material of the first layer is PC and the first filler is PS microspheres, which are manufactured by a melt mixing method. The refractive index n of the material of the first layer is 1.59, the refractive index m of the first filler is 1.58 which is 97 and the absolute value of the refractive index difference x is 0.0003. The thickness of the thin film is 50 μm, and the first filler in the thin film has a particle size of 3 μm and a mass percentage of 2%.

Comparative example 3
In the base film of this comparative example, the material of the first layer is PETG, and the first filler is PS microspheres, which are manufactured by a melt mixing method. The refractive index n of the material of the first layer is 1.54, the refractive index m of the first filler is 1.5404 and the absolute value of the refractive index difference x is 0.0004. The thickness of the thin film is 50 μm, and the first filler in the thin film has a particle size of 3 μm and a mass percentage of 2%.

Performance tests were performed on the base films of Examples 1-11 and Comparative Examples 1-3, and the results are shown in Table 1.

Example 12
This example is a composite film comprising the base film of Example 1, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 100 nm.

Example 13
This example is a composite film comprising the base film of Example 2, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 100 nm.

Example 14
This example is a composite film comprising the base film of Example 3, a reflective film, a second adhesive layer and a substrate layer which are laminated in this order, and the material of the reflective film is a metallic silver material. , with a thickness of 100 nm.

Example 15
This example is a composite film comprising the base film of Example 4, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 200 nm.

Example 16
This example is a composite film comprising the base film of Example 5, a reflective film, a second adhesive layer and a substrate layer which are laminated in this order, and the material of the reflective film is a metallic silver material. , with a thickness of 100 nm.

Example 17
This example is a composite film comprising the base film of Example 6, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material, Its thickness is 150 nm.

Example 18
This example is a composite film comprising the base film of Example 7, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the reflective film is made of metallic silver material. , and a thickness of 400 nm.

Example 19
This example is a composite film comprising the base film of Example 8, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , and a thickness of 400 nm.

Example 20
This example is a composite film comprising the base film of Example 9, a reflective film, a second adhesive layer and a substrate layer which are laminated in this order, and the material of the reflective film is a metallic silver material. , with a thickness of 250 nm.

Example 21
This example is a composite film comprising the base film of Example 10, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 250 nm.

Example 22
This example is a composite film comprising the base film of Example 11, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 250 nm.

Comparative example 4
This comparative example is a composite film including the base film of Comparative Example 1, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 250 nm.

Comparative example 5
This comparative example is a composite film including the base film of Comparative Example 2, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 250 nm.

Comparative example 6
This comparative example is a composite film including the base film of Comparative Example 3, a reflective film, a second adhesive layer and a substrate layer which are laminated in order, and the material of the reflective film is a metallic silver material. , with a thickness of 250 nm.

Performance tests were performed on the composite films of Examples 12-22 and Comparative Examples 4-6, and the results are shown in Table 2.

Example 23
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded molded. The first layer comprises a polyethylene terephthalate (PET) layer and silicon carbide particles with an average particle size of 3 μm dispersed in the polyethylene terephthalate (PET) layer, the mass percentage of the silicon carbide particles in the first layer being 3%, Both the second layer and the third layer are polyethylene terephthalate (PET) layers, the thickness of the first layer is 75 μm, and the thickness of both the second layer and the third layer is 25 μm.

Example 24
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded be done. The first layer includes a polymethyl methacrylate (PMMA) layer and barium sulfate particles with an average particle size of 5 μm dispersed in the polymethyl methacrylate (PMMA) layer, and the mass percentage of the barium sulfate particles in the first layer is 5%. Both the second and third layers are polymethyl methacrylate (PMMA), the thickness of the first layer is 75 μm, and the thickness of both the second and third layers is 25 μm.

Example 25
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded be done. The first layer contains a polyethylene terephthalate glycol (PETG) layer and silica particles with an average particle size of 6 μm dispersed in the polyethylene terephthalate glycol (PETG) layer, the mass percentage of the silica particles in the first layer is 10%, Both the second layer and the third layer are polyethylene terephthalate glycol (PETG) layers, the thickness of the first layer is 75 μm, and the thickness of both the second layer and the third layer is 25 μm.

Example 26
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded be done. the first layer comprises a polypropylene (PC) layer and titanium dioxide particles with an average particle size of 0.8 μm dispersed in the polypropylene (PC) layer, the mass percentage of the titanium dioxide particles in the first layer being 15%; Both the second layer and the third layer are polypropylene (PC), the thickness of the first layer is 75 μm, and the thickness of both the second layer and the third layer is 25 μm.

Example 27
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded be done. the first layer comprises a poly(4-methyl-1-pentene) (TPX) layer and calcium carbide particles with an average particle size of 2 μm dispersed in the poly(4-methyl-1-pentene) (TPX) layer; The mass percentage of calcium carbide particles in the first layer is 20%, the second and third layers are both poly(4-methyl-1-pentene) (TPX) layers, and the thickness of the first layer is 75 μm. and the thickness of each of the second layer and the third layer is 25 μm.

Example 28
This example differs from Example 25 in that the thickness of the first layer is 25 μm, the thickness of the second layer is 5 μm, and the thickness of the third layer is 15 μm.

Example 29
This example differs from Example 25 in that the thickness of the first layer is 50 μm, the thickness of the second layer is 10 μm, and the thickness of the third layer is 20 μm.

Example 30
This example differs from Example 25 in that the thickness of the first layer is 100 μm, the thickness of the second layer is 5 μm, and the thickness of the third layer is 25 μm.

Comparative example 7
This comparative example is a conventional single-layer base film comprising a polyethylene naphthalate (PEN) layer and titanium nitride particles with an average particle size of 3 μm dispersed in the polyethylene naphthalate (PEN) layer, wherein the titanium nitride particles are is 1% and the thickness is 75 μm.

Comparative example 8
The difference between this comparative example and Example 25 is that the mass percentage of silica particles having an average particle size of 6 μm in the first layer is 1%.

Comparative example 9
The difference between this comparative example and Example 25 is that the thickness of the first layer is 75 μm, and the thickness of each of the second and third layers is 3 μm.

Performance tests were performed on the base films of Examples 23-30 and Comparative Examples 7-9, and the results are shown in Table 3.

Example 31
The difference between this example and Example 25 is that both the second layer and the third layer are polyethylene terephthalate glycol (PETG) and polyethylene terephthalate glycol (PETG) layers dispersed in a sheet-like sheet having an average particle size of 100 nm. Calcium hydroxide particles are included, and the mass percentage of the calcium hydroxide particles is 0.5%.

Example 32
The difference between this example and Example 25 is that both the second layer and the third layer are polyethylene terephthalate glycol (PETG) and polyethylene terephthalate glycol (PETG) layers dispersed in a sheet-like sheet having an average particle size of 200 nm. containing alumina particles, the mass percentage of alumina particles is 0.5%, the second layer further contains UV-P ultraviolet absorber, antioxidant 1010, and antioxidant 168, The total weight percentage of the ultraviolet absorber, antioxidant 1010, and antioxidant 168 is 2%.

Example 33
The difference between this example and Example 25 is that both the second layer and the third layer are polyethylene terephthalate glycol (PETG) and polyethylene terephthalate glycol (PETG) layers dispersed in a sheet-like sheet having an average particle size of 300 nm. containing cerium oxide particles, the mass percentage of the cerium oxide particles being 1%; the second layer further comprising UV531 UV absorber, antioxidant 1010, and antioxidant 168; The total mass percentage of antioxidant 1010 and antioxidant 168 is 1.5%.

Example 34
The difference between this example and Example 25 is that the second layer is a polyethylene terephthalate glycol (PETG) layer, a sheet-like aluminum hydroxide with an average particle size of 300 nm dispersed in the polyethylene terephthalate glycol (PETG) layer, and UV531 ultraviolet rays. Absorber, antioxidant 1010, and antioxidant 168, with a weight percentage of aluminum hydroxide of 1%, and a sum of weight percentages of UV531 ultraviolet absorber, antioxidant 1010, and antioxidant 168 of 1 %, and the third layer contains a polyethylene terephthalate glycol (PETG) layer and sheet-like zirconium oxide with an average particle diameter of 300 nm dispersed in the polyethylene terephthalate glycol (PETG) layer, and the mass percentage of zirconium oxide is 2 %.

Example 35
The difference between this example and Example 25 is that the second layer is a polyethylene terephthalate glycol (PETG) layer, sheet-like calcium hydroxide particles with an average particle size of 600 nm dispersed in the polyethylene terephthalate glycol (PETG) layer, UV -P UV absorber, antioxidant 1010, and antioxidant 168, with a mass percentage of calcium hydroxide particles of 1%, and UV-P UV absorber, antioxidant 1010, and antioxidant 168 The total mass percentage is 0.5%, and the third layer contains a polyethylene terephthalate glycol (PETG) layer and sheet-like alumina particles with an average particle size of 750 nm dispersed in the polyethylene terephthalate glycol (PETG) layer. , the mass percentage of alumina particles is 1%.

Performance tests were performed on the base films of Examples 31-35. For the light transmittance, water vapor transmittance, and UV blocking rate of the second layer and the third layer, refer to the parameters such as the components and thickness of the second layer and the third layer in Examples 31-35. Table 4 shows the results of the data measured by extruding the second and third layers, which are monolayers, by the same method.

Example 36
This example provides a composite film comprising the base film of Example 25, a reflective film, a second adhesive layer and a substrate layer laminated in order, wherein the reflective film is made of metallic silver material. and has a thickness of 100 nm.

Example 37
This example provides a composite film comprising the base film of Example 32, a reflective film, a _second adhesive layer and a base layer laminated in order, wherein the material of the reflective film is ZrO2. , with a thickness of 200 nm.

Example 38
This example provides a composite film comprising the base film of Example 32, a reflective film, a second adhesive layer and a substrate layer laminated in order, wherein the reflective film is made of silver alloy. , with a thickness of 50 nm.

The composite films of Examples 36-38 were subjected to performance tests including thermal reflectance, 7 μm-14 μm atmospheric window emissivity, UV blocking rate, and service life.

Example 39
In the base film of this example, the material of the first layer is PMMA, and the first filler is a mixture of PS microspheres and silicon carbide particles, which is produced by melt mixing method. The refractive index n of the material of the first layer is 1.49, the refractive index m of the PS microspheres is 1.58, and the absolute value of the refractive index difference x is 0.09. The thickness of the base film is 50 μm, the particle size of the first filler in the base film is 3 μm, the mass percentage of PS microspheres in the first filler is 2%, and the mass percentage of silicon carbide particles is 1%. is.

Example 40
In the base film of this example, the material of the first layer is PMMA, and the first filler is a mixture of PS microspheres and silicon carbide particles, which is produced by melt mixing method. The refractive index n of the material of the first layer is 1.49, the refractive index m of the PS microspheres is 1.58, and the absolute value of the refractive index difference x is 0.09. The thickness of the base film is 50 μm, the particle size of the first filler in the base film is 3 μm, the mass percentage of PS microspheres in the first filler is 1%, and the mass percentage of silicon carbide particles is 1%. is.

Example 41
In the base film of this example, the material of the first layer is PMMA, and the first filler is a mixture of PS microspheres and silicon carbide particles, which is produced by melt mixing method. The refractive index n of the material of the first layer is 1.49, the refractive index m of the PS microspheres is 1.58, and the absolute value of the refractive index difference x is 0.09. The thickness of this base film is 50 μm, the particle size of the first filler in the base film is 3 μm, the mass percentage of PS microspheres in the first filler is 2%, and the mass percentage of silicon carbide particles is 2%. %.

Example 42
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded be done. The first layer comprises a polyethylene terephthalate (PET) layer, and PS microspheres with an average particle size of 3 μm and silicon carbide particles dispersed in the polyethylene terephthalate (PET) layer, and the mass percentage of the silicon carbide particles in the first layer is 3%, the mass percentage of PS microspheres is 2%, the second and third layers are both polyethylene terephthalate (PET) layers, the thickness of the first layer is 75 μm, the second layer and Each third layer has a thickness of 25 μm.

Example 43
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded be done. The first layer comprises a polyethylene terephthalate (PET) layer, and PS microspheres with an average particle size of 3 μm and silicon carbide particles dispersed in the polyethylene terephthalate (PET) layer, and the mass percentage of the silicon carbide particles in the first layer is 5%, the mass percentage of PS microspheres is 2%, the second and third layers are both polyethylene terephthalate (PET) layers, the thickness of the first layer is 75 μm, the second layer and Each third layer has a thickness of 25 μm.

Example 44
The base film comprises a first layer and second and third layers provided on opposite sides of the first layer, wherein the first, second and third layers are three-layer coextruded be done. The first layer is a polyethylene terephthalate (PET) layer, and PS microspheres with an average particle size of 3 μm and silicon carbide particles dispersed in the polyethylene terephthalate (PET) layer, and the mass percentage of the silicon carbide particles in the first layer is 8%, the mass percentage of PS microspheres is 1%, the second and third layers are both polyethylene terephthalate (PET) layers, the thickness of the first layer is 75 μm, the second layer and Each third layer has a thickness of 25 μm.

Performance tests were performed on the base films of Examples 39-44 and the results are shown in Table 6.

Example 45
The difference of this example from Example 12 is that the base film is the base film of Example 39.

Example 46
The difference of this example from Example 12 is that the base film is the base film of Example 40. FIG.

Example 47
The difference of this example from Example 12 is that the base film of Example 41 is used.

Example 48
The difference of this example from Example 12 is that the base film is the base film of Example 42.

Example 49
The difference of this example from Example 12 is that the base film is the base film of Example 43.

Example 50
The difference of this example from Example 12 is that the base film is the base film of Example 44.

Performance tests were performed on the composite films of Examples 45-50 and the results are shown in Table 7.

<Industrial Application Example 1>

A box of 5.58 m × 2.38 m × 2.68 m (length × width × height) was used to simulate the temperature reduction effect on the inside of the box type substation when the composite film is applied to the box type substation. Type substations A and B were provided. The composite film of Example 38 was applied to the 5 outer surfaces of A, while the outer surface of B was left untreated.

A temperature measurement point for environmental temperature was set at the center of a high-voltage cabinet inside a box-type substation, and temperature data at temperature measurement points A1 and B1 were continuously collected. As shown in the temperature curve in FIG. 6, C1 is the temperature difference curve, as can be seen from FIG. 6, the composite film can effectively reduce the temperature of the high pressure cabinet of the box substation.

A temperature measurement point for environmental temperature was set at the center of the transformer inside the box-type substation, and temperature data at temperature measurement points A2 and B2 were continuously collected. As shown in the temperature curve in FIG. 7, C2 is the temperature difference curve, as can be seen from FIG. 7, the composite film can effectively reduce the temperature of the transformer of the box substation.

A temperature measurement point for environmental temperature was set in the middle of the low-voltage distribution cabinet inside the box-type substation, and the temperature data of temperature measurement points A3 and B3 were continuously collected. As shown in the temperature curve in FIG. 8, C3 is the temperature difference curve, as can be seen from FIG. 8, the composite film can effectively reduce the temperature of the low voltage equipment of the box substation.

<Industrial Application Example 2>
Two model houses D and E as shown in FIG. 9 were provided in order to simulate the temperature reduction effect on the inside of the building when the solar reflective film is applied to the building. The model house has a occupied area of 4m x 3m, a roof height of 2m and a roof ridge height of 2.5m, and the main building materials mainly include steel and plastic plates. The exterior surface of model house D was completely covered with the composite film of Example 38, and the exterior surface of model house E was left untreated.

A temperature measurement point was set at an intermediate position 1.2 m from the ground in the model house, and temperature change information in the two model houses was collected. The obtained data are shown in FIG. 10, where F is a temperature difference curve. As can be seen from FIG. 10, the composite film can effectively reduce the internal temperature of the model house.

In the test results of the present application, "light transmittance" means transmittance for visible wavelengths of 400 nm to 760 nm, and heat reflectance means reflectance for a wavelength range of 300 nm to 2500 nm.

Each technical feature of the above embodiments may be combined arbitrarily. In order to simplify the description, not all possible combinations of each technical feature of the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, all should be considered within the scope of this specification.

Although the above examples merely represent some embodiments of the present application, and the description thereof is more specific and detailed, they should not be construed as limiting the scope of the present patent application. It should be noted that those skilled in the art may make some modifications and improvements without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the present invention shall be restricted by the attached claims.

In the figure: 1, substrate 2, composite film 3, first adhesive layer 21, base film 22, reflective film 23, second adhesive layer 24, substrate layer 211, first layer 212, first filler 213, Second layer 214, second filler 215, third layer 216, third filler

Claims (21)

A base film comprising a first layer and a first filler, the first filler dispersed in the first layer, wherein the refractive index of the material of the first layer is n(1.3-1.7 ), the refractive index of the first filler is m, the difference between n and m is x, the absolute value of x is 0.0005 or more, and the base film has a refractive index of 7 μm to 14 μm at an atmospheric window. It has an emissivity of 80% or more, a heat reflectance of 10% or more in the nm wavelength range of 300 nm to 2500, and a glossiness of 20 GU or less, and the base film is provided on both opposite sides of the first layer. Further comprising a second layer and a third layer provided on the surface, the second layer further dispersed with a second filler , the third layer further dispersed with a third filler , the second filler and The third filler is capable of blocking moisture from penetrating the first layer, the second filler blocks a portion of moisture penetration in the second layer, and the third filler is blocks a portion of the penetration of moisture in said third layer . The first layer, the second layer, and the third layer are co-extruded, the thickness ratio of the second layer to the first layer is 1:1-1:20, and the third layer and The base film of claim 1, wherein the first layer has a thickness ratio of 1:1-1:20. 3. The base film according to claim 1, wherein the material of the first layer contains at least one of polyesters, polyacrylates, polyamides, polyurethanes, polyolefins and fluororesins. The polyesters include at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene terephthalate glycol, polyethylene terephthalate-1,4-cyclohexanedimethanol ester, and the polyacrylates are acrylonitrile-butadiene-styrene plastics. , polymethyl methacrylate, said polyamides comprising at least one of nylon 6, nylon 66, nylon 12, nylon 1010, said polyolefins comprising polyethylene, polypropylene, poly(4-methyl -1-pentene), and the fluorine resin contains at least one of tetrafluoroethylene-hexafluoropropylene copolymer, polyvinylidene fluoride, and ethylene-chlorotrifluoroethylene copolymer. The base film according to claim 3, characterized in that: 4. The base film of claim 3, wherein the material of the second layer and the material of the third layer are the same as the material of the first layer. The first filler comprises at least one of an organic filler and an inorganic filler, and the mass percentage of the first filler in the first layer is 2%-20%. 3. The base film according to 1 or 2. The first filler is an organic filler, the absolute value of x is 0.05 or more, the mass percentage of the first filler in the first layer is 2%-5%, and the organic filler is 7. The base film of claim 6, wherein the base film comprises at least one of polyacrylate particles, polystyrene particles, polyurethane particles, polymethylmethacrylate particles, epoxy resin particles. 8. The base film of claim 7, wherein the melting point of the organic filler is higher than the melting point of the material of the first layer. 8. The base film of claim 7, wherein the organic filler is a hollow filler. The first filler is an inorganic filler, the mass percentage of the first filler in the first layer is 3% or more, and the inorganic filler is titanium nitride particles, titanium dioxide particles, silicon carbide particles, silica 7. The base film of claim 6, comprising at least one of particles, barium sulfate particles, calcium sulfate particles, calcium carbonate particles. 3. The base film of claim 1 or 2, wherein the first layer comprises cells. 3. The base film according to claim 1, wherein the particle size of the first filler is 0.1 μm-20 μm. 3. The base film according to claim 2, wherein the thickness of the first layer is 25 [mu]m or more, and the thickness of the second layer and the thickness of the third layer are both 5 [mu]m or more. The mass percentage of the second filler in the second layer is 0.5%-2%,
and/or wherein the mass percentage of said third filler in said third layer is 0.5%-2%. The light transmittance of the second layer is 82% or more, and the water vapor transmission rate of the second layer is 10 g/(m ² ·24 h) or less,
and/or, the third layer has a light transmittance of 82% or more and a water vapor transmission rate of 10 g/(m ² ·24 h) or less, according to claim 2. base film. The second layer further contains an ultraviolet absorber, and the ultraviolet blocking rate of the second layer is 80% or more,
And, the second layer further comprises an antioxidant, and the sum of the mass percentages of the antioxidant and the ultraviolet absorber in the second layer is 0.5%-4%. 2. The base film according to 2. The base film of claim 1, wherein the base film has a light transmittance of 82% or more. A composite film comprising the base film according to any one of claims 1 to 17, and a reflective film, a second adhesive layer, and a base layer laminated in order on the base film, The composite film has a glossiness of 70 GU or less, an emissivity of 80% or more at an atmospheric window of 7 μm to 14 μm, and a heat reflectance of 85% or more in a wavelength range of 300 nm to 2500 nm. A composite film characterized by: 19. The composite film according to claim 18, characterized in that the material of said reflective film is metallic material and/or ceramic material. A product comprising the composite film according to any one of claims 18 to 19, comprising a substrate, and a first adhesive layer and a composite film laminated in order on the surface of the substrate, wherein the composite A product, wherein a base layer of a film is attached to the first adhesive layer. 21. The article of manufacture, including composite film, of claim 20, wherein the substrate comprises at least one of metal, plastic, glass, rubber, pitch, cement, and fabric.

Images