JP6540105B2 - Decorative sheet and decorative board - Google Patents

Description

  The present invention relates to a decorative sheet and a decorative board.

  Conventionally, a decorative sheet using an olefin resin excellent in weather resistance as a base material layer is used for exterior members such as an entrance door, the same frame material, and a window frame (see Patent Document 1).

JP, 2013-22836, A

However, although the olefin resin is excellent in weather resistance, it has a heat storage function of storing heat of infrared light contained in sunlight. Therefore, in the decorative sheet using an olefin resin as the base material layer, a temperature difference occurs between the front surface and the back surface where sunlight is applied, and the thermal expansion amount of the surface is larger than the thermal expansion amount of the back surface due to this temperature difference. And warpage may occur.
This invention pays attention to the above points, and while it is excellent in weather resistance, it aims at providing a decorative sheet and a decorative board which can control generation | occurrence | production of the curvature by sunlight.

In order to solve the above-mentioned subject, the decorative sheet which is one mode of the present invention has a picture printed layer formed by printing on one side of a colored thermoplastic resin layer, and a transparent thermoplastic resin layer of two or more layers. In the transparent thermoplastic resin layer, the inner layer which is a layer other than the outermost layer is made of an acrylic resin, and the moisture permeability of the thermoplastic resin constituting the outermost layer is greater than the moisture permeability of the acrylic resin low picture pattern printed layer state, and are the transmittance of infrared light is 40% or more, the titanium oxide containing less than 50 wt% as the pigment, the colored thermoplastic resin layer, oxide relative to 100 parts by weight of the thermoplastic resin It is characterized in that titanium is contained in a range of 23 parts by mass or more and 50 parts by mass or less .

  According to one aspect of the present invention, since the inner layer of the transparent thermoplastic resin layer is made of an acrylic resin, it can be excellent in weather resistance. In addition, since the pattern printing layer transmits infrared light and the transmitted infrared light is reflected by the colored thermoplastic resin layer, the heat storage effect of the infrared light can be reduced and the infrared light (sunlight) hits The temperature difference between the front and back surfaces can be reduced, and the occurrence of warpage due to sunlight can be suppressed. Thereby, according to one aspect of the present invention, it is possible to provide a decorative sheet which is excellent in weather resistance and which can suppress the occurrence of warpage due to sunlight.

It is a sectional view showing a decorative board concerning an embodiment based on the present invention.

Next, embodiments of the present invention will be described with reference to the drawings.
Here, the drawings are schematic, and the relationship between the thickness and the planar dimension, the ratio of the thickness of each layer, and the like are different from actual ones. Moreover, the embodiment shown below exemplifies the structure for embodying the technical idea of this invention, Comprising: The technical idea of this invention is the material of a component, a shape, a structure, etc. Not specific to The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(Cosmetic panel 10)
The decorative board 10 of this embodiment is, as shown in FIG. 1, formed on one side of the colored thermoplastic resin layer 1 with a picture print layer 2, a transparent adhesive layer 3 and a transparent thermoplastic resin layer of two or more layers. 4 is laminated in this order to form the decorative sheet 20, and the base material 6 is bonded to the other surface side of the colored thermoplastic resin layer 1 via the primer layer 5. The decorative panel 10 of the present embodiment is particularly suitable for exterior applications such as entrance doors, roofs, outer walls, louvers, and the like.

(Colored thermoplastic resin layer 1)
The colored thermoplastic resin layer 1 is a sheet-like layer made of a thermoplastic resin. The thermoplastic resin is not particularly limited, and known thermoplastic resins can be used. For example, polypropylene resins such as homopolypropylene resins and random polypropylene resins, or polyethylene resins are preferable. In addition, a hindered phenol-based antioxidant, an ultraviolet light absorber, a hindered amine-based light stabilizer, or the like may be added to the thermoplastic resin of the colored thermoplastic resin layer 1.

Moreover, the resin which comprises the coloring thermoplastic resin layer 1 contains the titanium oxide as a pigment. Thereby, when infrared light permeate | transmits the pattern printing layer 2, the colored thermoplastic resin layer 1 reflects the transmitted infrared light. Moreover, the titanium oxide is included in the range of 23 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the thermoplastic resin. Thereby, the infrared light which the pattern printing layer 2 permeate | transmitted can be reflected more appropriately, and the colored thermoplastic resin layer 1 can be formed more appropriately (film formation).
In addition, although the example which includes the titanium oxide which is a pigment in resin of the coloring thermoplastic resin layer 1 was shown in this embodiment, another structure is also employable. For example, a paint containing titanium oxide as a pigment may be applied to the surface of the colored thermoplastic resin layer 1 on the pattern printing layer 2 side.

(Pattern print layer 2)
The picture print layer 2 is a layer formed by printing a picture for providing design. As the pattern, for example, a pattern suitable for a place using the decorative sheet 20, such as wood, stone, abstract pattern, etc. can be selected. In addition, the printing ink contains, for example, isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide, or a mixture thereof as a pigment. Thereby, the transmissivity of the infrared light of the printing ink is 40% or more. Therefore, since the pattern printing layer 2 transmits infrared light and the transmitted infrared light is reflected by the colored thermoplastic resin layer 1, the heat storage effect by the heat of the infrared light is reduced.

Here, as the method for measuring the transmittance of the printing ink, to a biaxially stretched PET film Thickness 25 [mu] m (Toray Co. Lumirror S50), printed with inks containing dispersed pigment so that the weight 1 g / m @ 2, The transmittance of 860 measurement points was measured every 2 nm in the region of wavelengths 782 nm to 2500 nm with a spectrophotometer UV 3600 manufactured by Shimadzu Corporation, and the total value of transmittance (% T) of each wavelength was divided by the number of measurement points A method is used in which the division result is the transmittance of infrared light. That is, it is calculated by the formula “infrared light transmittance = measurement transmittance of each infrared wavelength (782 nm or more and 2500 nm or less) (% T) / total number of measurement points / (the number of measurement points (860))”.
Moreover, as for the thickness of the pattern printing layer 2, 5 micrometers or more and 10 micrometers or less are preferable. Furthermore, it is preferable that the ratio of the titanium oxide in resin which comprises the pattern printing layer 2 shall be 50% or less.

(Transparent adhesive layer 3)
The transparent adhesive layer 3 is a transparent sheet-like layer made of a urethane adhesive having a polyester resin as a main chain. As a urethane adhesive having a polyester resin as a main chain, for example, a two-component urethane resin adhesive composed of polyester polyol etc. and hexamethylene diisocyanate, tolylene diisocyanate or a mixture thereof can be used.
Moreover, according to the use of the decorative sheet 20, the urethane adhesive constituting the transparent adhesive layer 3 may be an antioxidant, an ultraviolet light absorber, a light stabilizer, a heat stabilizer, a plasticizer, a lubricant, an antistatic agent. Additives such as flame retardants and fillers may be added.

(Transparent thermoplastic resin layer 4)
The transparent thermoplastic resin layer 4 is composed of an outermost layer 4 b and an inner layer 4 a inside the outermost layer 4 b. The inner layer 4a may have two or more layers. However, in consideration of processability and nonflammability, the total thickness of the transparent thermoplastic resin layer 4 is preferably 20 to 80 μm. In particular, in consideration of the weather resistance, 30 to 60 μm is preferable.
(Inner layer 4a)
The inner layer 4a is a transparent sheet-like layer made of an acrylic resin. The acrylic resin is not particularly limited, and known acrylic resins can be used. For example, methyl methacrylate resin and polymethyl methacrylate resin (Tg is about -20 ° C) can be used. The thickness of the inner layer 4a is preferably 85% or more and 90% or less of the total thickness of the transparent thermoplastic resin layer 4 in consideration of weatherability. Furthermore, to the acrylic resin, known ultraviolet light absorbers and light stabilizers may be added.

(The outermost layer 4b)
The outermost layer 4 b is a transparent sheet-like layer made of a thermoplastic resin. The moisture permeability of the thermoplastic resin constituting the outermost layer 4b was lower than the relative humidity of the acrylic resin constituting the inner layer 4a. Thereby, the moisture contained in the outermost layer 4b can be reduced, the acrylic resin in the inner layer 4a can be prevented from being deteriorated by the moisture, and the deterioration of the acrylic resin in the inner layer 4a can be suppressed for a long time. The deterioration includes, for example, chalking whitening and crack whitening.
As the thermoplastic resin, a fluorine resin can be used in consideration of various resistances. As the fluorine resin, for example, polyvinylidene fluoride (PVDF), tetrafluoroethylene resin (PTFE), tetrafluoroethylene perfluoroalkoxyvinylether copolymer (PFA), tetrafluoroethylene · hexafluoropropylene copolymer ( FEP), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-ethylene copolymer (ETFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE) and polyvinyl fluoride (PVF) are preferred. In particular, polyvinylidene fluoride resin (the Tg of PVDF is -39 ° C) is more preferable in consideration of the bending whitening property and the adhesiveness with the inner layer 4a. The thickness of the outermost layer 4b is preferably 5% or more and 15% or less of the total thickness of the transparent thermoplastic resin layer 4 in consideration of weatherability.

(Primer layer 5)
The primer layer 5 is a sheet-like layer made of a primer agent. The primer agent is not particularly limited, and known primer agents can be used. For example, various primer agents such as urethane type, acrylic type, ethylene-vinyl acetate copolymer type, and vinyl chloride-vinyl acetate copolymer type can be used. In addition, powders such as silica, alumina, calcium carbonate and barium sulfate may be added to the primer agent constituting the primer layer 5. As a result, the surface of the primer layer 5 can be roughened, blocking of the decorative sheet 20 during winding and storage can be prevented, and adhesion to the laminating adhesive can be improved by the anchoring effect.

(Base 6)
The base 6 is a plate-like member made of metal or wood. As a metal system, aluminum, steel, stainless steel, and a composite panel can be used, for example. As a composite panel, for example, there are panels provided with a resin layer as a core material and metal plates (aluminum, galvanium, stainless steel, etc.) attached to both sides of the resin layer. Moreover, as a woody system, MDF (medium density fiberboard), plywood, particle board can be used.

(Effect of this embodiment)
The invention which concerns on this embodiment has the following effects.
(1) In the decorative sheet 20 according to the present embodiment, a design print layer 2 formed by printing and two or more transparent thermoplastic resin layers 4 are formed in this order on one side of the colored thermoplastic resin layer 1 It is laminated and constituted. In the transparent thermoplastic resin layer 4, the inner layer 4a other than the outermost layer is made of an acrylic resin, and the moisture permeability of the thermoplastic resin constituting the outermost layer 4b is lower than the moisture permeability of the acrylic resin, The thermoplastic resin layer 1 uses titanium oxide as a pigment, and the pattern printing layer 2 uses an ink having an infrared light transmittance of 40% or more as a printing ink.

According to such a configuration, since the inner layer 4a of the transparent thermoplastic resin layer 4 is made of an acrylic resin, it can be excellent in weather resistance. Moreover, since the pattern printing layer 2 transmits infrared light and the transmitted infrared light is reflected by the colored thermoplastic resin layer 1, the heat storage effect of infrared light can be reduced, and infrared light (sunlight) It is possible to reduce the temperature difference between the front surface and the back surface, and to suppress the occurrence of warpage due to sunlight. Thereby, the decorative sheet 20 which concerns on this embodiment can provide the decorative sheet 20 which can suppress generation | occurrence | production of the curvature by sunlight while it is excellent in a weather resistance.
Further, the moisture contained in the outermost layer 4b of the transparent thermoplastic resin layer 4 can be reduced, and the degradation of the acrylic resin of the inner layer 4a due to the moisture can be prevented. Thereby, the deterioration of the acrylic resin of the inner layer 4a can be suppressed for a long time.

(2) In the decorative sheet 20 which concerns on this embodiment, the thermoplastic resin which comprises the outermost layer 4b is a fluororesin.
According to such a configuration, it has weather resistance, stain resistance, processability, and noncombustibility.
(3) In the decorative sheet 20 according to the present embodiment, the fluorine resin is a polyvinylidene fluoride resin.
According to such a configuration, by using a polyvinylidene fluoride resin, it is possible to further improve the whitening property for bending and the adhesion with the inner layer 4a.

(4) In the decorative sheet 20 according to the present embodiment, the printing ink of the pattern printing layer 2 is any of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide, or a mixture thereof As a pigment.
According to such a configuration, the colored thermoplastic resin layer 1 and the picture print layer 2 can be appropriately formed.
(5) In the decorative sheet 20 which concerns on this embodiment, the coloring thermoplastic resin layer 1 contains a titanium oxide in 23 mass parts or more and 50 mass parts or less with respect to 100 mass parts of thermoplastic resins.
According to such a configuration, it is possible to more appropriately reflect the infrared light transmitted through the pattern printing layer 2 and to form (film formation) the colored thermoplastic resin layer 1 appropriately.
(6) The decorative board 10 which concerns on this embodiment bonds the decorative sheet 20 to the base material 6, and is formed.
According to such a configuration, the occurrence of warping of the decorative sheet 20 due to infrared light can be suppressed.

Next, an embodiment based on the present invention will be described.
Example 1
In Example 1, 3 parts by mass of a hindered phenol-based antioxidant, 1 part by mass of a UV absorber, 1 part by mass of a hindered amine light stabilizer, and 23 parts by mass of titanium oxide with respect to 100 parts by mass of a polypropylene resin The colored thermoplastic resin layer 1 was provided using the added mixture. The thickness of the colored thermoplastic resin layer 1 was 70 μm. Subsequently, 100 parts by mass of a mixture of urethane resin and vinyl chloride = vinyl acetate copolymer resin mixed at 7: 3 on the surface of the colored thermoplastic resin layer 1 with hexamethylene diisocyanate and isophorone diisocyanate at 2: 8 Using an ink to which 3 parts by mass of a mixed curing agent and 3 parts by mass of a pigment consisting of isoindolinone, polyazo and phthalocyanine are added, a pattern (grain pattern) is printed by gravure printing to provide a pattern printing layer 2 The The transmittance of infrared light of the printing ink of the pattern print layer 2 was 40%.

Subsequently, an acrylic-polyester-salt-and-vinyl acetate type heat-adhesive resin (acrylic resin: polyester resin: vinyl acetate = 30: 30: 30) is coated on the pattern print layer 2 by a gravure coating method. The transparent adhesive layer 3 was formed. The application amount of the transparent adhesive layer 3 (application amount after drying) was 1.5 g / m ² .
Subsequently, a polyvinylidene fluoride resin having a thickness of 5 μm and a moisture permeability of 5.0 g / m ² · 24 hours (according to JIS-K-7129-1992) and a thickness of 45 μm and a moisture permeability of 200 g / m ² · 24 hours (JIS- K-7129-1992) and a laminate comprising the outermost layer 4b and the inner layer 4a by melt extrusion using a methyl methacrylate resin (according to K-7129-1992) and extruded onto the transparent adhesive layer 3 formed above Superposing, a decorative sheet 20 was provided.

(Example 2)
In Example 2, in place of the polypropylene resin, a colored thermoplastic resin layer 1 was provided using a polyethylene resin. A decorative sheet 20 of Example 2 was produced in the same manner as in Example 1 except for the above.
(Comparative example)
In the comparative example, the pigment used for the pattern print layer 2 is carbon black. A decorative sheet 20 of a comparative example was produced in the same manner as in Example 1 except for the above.

(Evaluation judgment)
The following evaluation was implemented about the decorative sheet 20 of each above Example and each comparative example.
(Weatherability)
After conducting the test using a metal halide lamp type super accelerated weathering tester (manufactured by Daipla Wintess Co., Ltd.) with an illuminance of 650 W / m ² and a black panel temperature of 53 ° C., the presence or absence of cracks or peeling of the appearance by visual confirmation It was confirmed. At that time, a case where there was no crack or peeling in the appearance was taken as “good”, and a case where the appearance was cracked or peeling was given as “not good”.

(Heat insulation)
The sunshine reflectance of the coating film was measured in accordance with JIS K 5602. The measurement was performed using a spectrophotometer UV3600 manufactured by Shimadzu Corporation. In that case, the case where the solar radiation reflectance of a coating film is 40% or more was made into pass "O", and the case where it is 40% or less was made into rejection "x".
(Thermal storage capacity)
A single-sided decorative sheet 20 was bonded to an unpainted steel plate having a length of 21 cm, a width of 29.7 cm, and a thickness of 0.5 mm using an adhesive. And halogen bulbs were installed at a position 15 cm away from the decorative sheet 20, light was continuously irradiated from the halogen spheres to the decorative sheet 20 for 120 minutes, and the temperatures of the front and back of the steel plate were recorded every minute The maximum value was measured.

  The evaluation results are shown in Table 1.

From Table 1, the inner layer 4a of the transparent thermoplastic resin layer 4 is made of an acrylic resin, the colored thermoplastic resin layer 1 uses titanium oxide as a pigment, and the pattern printing layer 2 has a transmittance of 40% or more of infrared light In Examples 1 and 2 that satisfy the range of the present invention using the ink as the printing ink, it was found that the weather resistance, the heat shielding property, and the heat storage property are all good. That is, it turned out that while being excellent in weather resistance, generation | occurrence | production of the curvature by sunlight can be suppressed.
On the other hand, in the comparative example, although the weatherability is acceptable "o", the thermal barrier property is unacceptable "x", the temperature of the steel plate represented by the heat storage property is about 10 ° C than in the first embodiment and the second embodiment. It has become expensive.
In Example 1, the inner layer 4a of the transparent thermoplastic resin layer 4 is made of an acrylic resin, the colored thermoplastic resin layer 1 has titanium oxide as a pigment, and the pattern printing layer 2 has an infrared light transmittance. When the ink which is 40% or more was adjusted and implemented in the range of the present invention as printing ink, the same effect as Example 1 and Example 2 was acquired.

DESCRIPTION OF SYMBOLS 1 Colored thermoplastic resin layer 2 Pattern printing layer 3 Transparent adhesive layer 4 Transparent thermoplastic resin layer 4a Inner layer 4b Outermost layer 5 Primer layer 6 Base material 10 Decorative plate 20 Decorative sheet

Claims (5)

On one side of the colored thermoplastic resin layer, a picture print layer formed by printing, and two or more transparent thermoplastic resin layers are laminated in this order,
In the transparent thermoplastic resin layer, the inner layer other than the outermost layer is made of an acrylic resin, and the moisture permeability of the thermoplastic resin constituting the outermost layer is lower than the moisture permeability of the acrylic resin ,
Before Symbol picture-printed layer state, and are the transmittance of infrared light is more than 40%, containing 50 wt% or less of titanium oxide as a pigment,
The decorative sheet characterized in that the colored thermoplastic resin layer contains titanium oxide in a range of 23 parts by mass to 50 parts by mass with respect to 100 parts by mass of the thermoplastic resin .   The decorative sheet according to claim 1, wherein the thermoplastic resin constituting the outermost layer is a fluorine resin.   The decorative sheet according to claim 2, wherein the fluorine resin is a polyvinylidene fluoride resin.   The printing ink according to any one of claims 1 to 3, wherein the printing ink comprises isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, titanium oxide, or a mixture thereof as a pigment. The decorative sheet described in 1. A decorative board comprising the decorative sheet according to any one of claims 1 to 4 bonded to a base material.

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