JP6845211B2 - Composite structure - Google Patents

Description

The present invention relates mainly to a composite structure which is a heat insulating material used for air-conditioning pipes such as ducts.

Conventionally, a duct attached to a building or the like is covered with a heat insulating material in order to prevent dew condensation caused by a temperature difference between the inside and outside of the duct. As the heat insulating material of the duct, for example, glass wool, glass wool with a coating material, urethane foam, rubber foam, etc. are commercially available, and when these heat insulating materials are wrapped or glass wool with a coating material is fastened to the inside with a welding pin. Method is used.

However, urethane foam has poor workability and is used infrequently because the appearance after work is dirty. Therefore, most of the heat insulation of air conditioning ducts and the like is made of glass wool, and the current situation is that some rubber foams are used.

However, since glass wool has a high hygroscopicity, it may absorb a large amount of moisture in the outside air to increase the amount of moisture in the main body and increase the thermal conductivity. As the thermal conductivity increases, the heat insulating effect decreases, so it is necessary to provide moisture-proof protection. For example, it is necessary to cover the outside of glass wool with a vinyl sheet or aluminum foil, and further cover it with a moisture-proof cover such as a wire mesh, an iron plate, or a highly moisture-proof cloth. Therefore, there is a problem that there are many work processes and the efficiency is low.

In addition, since the moisture-proof cover is very fragile, it is not possible to keep the outer circumference of the duct warm at the time of shipment from the factory. Therefore, it is necessary to install the heat insulation structure after piping the duct shipped from the factory to the ceiling in the site room. However, the installation work of the heat insulating material is dangerous due to the work at a high place, and uncertain work occurs in a narrow place such as the ceiling, so it takes a long time to install the heat insulating material, and the duct piping construction cost. There is a problem of raising the price.

Furthermore, glass wool dust pierces the skin and causes itching and pain, and inhalation of the dust may cause a health hazard of respiratory diseases. Therefore, there is a problem that there is a risk of harming the health of not only workers but also people.

On the other hand, when the method of attaching the glass wool with a covering material to the inside of the duct with a welding pin is used, the above-mentioned problems are alleviated. However, since the wind is constantly flowing inside the duct, the covering material and the welding pin are liable to deteriorate, and the material is liable to fall off inside the duct. Once the material falls off, it may get on the wind of the air conditioner and flow into the room, so the above phenomenon is regarded as a problem.

As a method focusing on prevention of falling off, for example, a method has been proposed in which an outer cover material is attached to both sides of a mat-like fibrous heat insulating material and then attached to the outer peripheral surface or the inner peripheral surface of the duct (Patent Document 1). .. However, in Patent Document 1, since an adhesive is used, it takes an extra time to stand until the adhesive solidifies, and since an aluminum tape or the like is used, it takes time and effort, so that a remarkable effect of improving construction efficiency is not easily exhibited.

Further, a heat insulating duct has been proposed in which metal plates are combined to form a tubular shape and a heat insulating material is placed on the inner wall thereof (Patent Document 2). However, in an environment such as an air-conditioning duct where a strong wind always blows on the inner surface, the surface deterioration and the deterioration of the adhesive progress with ordinary resin foams and the rubber foams mentioned above, and they decompose, scatter, or fall off in the ducts. There is a risk of doing it. In fact, there have been reports of cases of glass wool and rubber foam lining down in the wind tunnel. Once the heat insulating material falls off in the duct, it cannot be removed without disassembling the duct. Therefore, when installing the heat insulating material in the duct wind tunnel, the most care must be taken to prevent it from falling off.

Further, when connecting ducts to each other when constructing ducts, a method of sandwiching packing such as rubber is mainly adopted in order to prevent air leakage from the connecting portion. All of the above-mentioned documents assume that the packing is used, and when considering the reduction of the construction man-hours at the site, it was necessary to provide a material that can reduce the packing man-hours.

Furthermore, it is preferable that the heat insulating material for ducts has a level of flame retardancy that can obtain the non-combustible certification of the Minister of Land, Infrastructure, Transport and Tourism due to the restrictions of the Building Standard Law. This is because the duct may pass through the section penetration part, and legally, in order to ensure the fire resistance of the building, the vicinity of the section penetration part must be made of non-combustible material for both the duct and the heat insulating material.

On the other hand, a composite composed of a resin foam attached to a metal plate, a reinforcing layer attached to the resin foam, and a metal foil attached to the reinforcing layer has been proposed (Patent Document 3). .. In order to prevent surface deterioration of the foam, perform construction without using rubber packing, and have a level of flame retardancy that can obtain the non-combustibility certification of the Minister of Land, Infrastructure, Transport and Tourism, foaming is performed as in Patent Document 3. It is considered effective to use a material in which a reinforcing layer and a metal foil are laminated on the body surface.

JP 2000-171085 JP-A-2007-212114 Japanese Patent No. 6190731

However, as described in Patent Document 3, since materials having different physical characteristics are used for each layer, when such a laminated body is attached to the inner surface of the duct, the duct of the composite structure is used. It is not possible to accurately grasp the adhesive stability and peeling behavior.

On the other hand, the inventors have used such a composite structure and when it is attached to the inner wall surface of the duct, the adhesive strength between the duct and the composite structure and the apparent flexural modulus of the composite structure. It has been found that if the relationship with and does not satisfy a predetermined relationship, a gap is created between the composite structure and the duct, and various problems occur.

The present invention has been made in view of such a problem, and it is possible to improve the efficiency of heat insulation construction of the duct and to satisfactorily adhere the composite structure to the duct, so that the material is scattered or dropped inside the duct. The purpose is to provide a non-existent composite structure.

The present invention for achieving the above-mentioned object is a composite structure for a building, which is a resin foam layer, a reinforcing layer attached to the resin foam layer, and a metal leaf attached to the reinforcing layer. A layer and an adhesive layer provided on a surface of the resin foam layer opposite to the reinforcing layer are provided, and the adhesive strength (A) (N / 10 mm) of the adhesive layer and the adhesive layer are excluded. The apparent flexural modulus (B) (MPa) of the composite structure when the metal foil layer is arranged on the surface and the bending test is performed along the processing direction of the resin foam layer is the resin foam. It is a composite structure characterized by satisfying (B) / (A) ≤ 4.0 at a flexural modulus of the layer or higher.

Here, the apparent flexural modulus (B) is set to be equal to or higher than the flexural modulus of the resin foam layer because the resin foam layer of the composite structure is reinforced by a reinforcing layer, a metal foil layer, or the like. Therefore, the apparent flexural modulus of the composite structure is larger than the flexural modulus of the resin foam. Therefore, the apparent flexural modulus of the composite structure of the present invention is equal to or higher than the flexural modulus of the resin foam layer, and the value varies depending on the thickness and material type of the reinforcing layer and the metal foil layer, but further. The ratio of the apparent flexural modulus to the adhesive force of the adhesive layer is 4.0 times or less.

Further, it is desirable that the upper limit of the adhesive strength (A) of the adhesive layer is equal to or less than the tear strength of the resin foam used. If the adhesive strength is equal to or greater than the tear strength of the resin foam, the material of the foam will break instead of peeling the adhesive when the material is to be peeled off. In that case, for example, when the foam is easily broken when it is applied once and then reattached, it can be said that an excessively high adhesive force is not practically preferable. Actually, the upper limit of the adhesive strength is 4.00 N / 10 mm even if the difference in the type of resin foam to be applied is taken into consideration. Further, the lower limit of the adhesive force is as long as the adhesive force for stably adhering the composite structure can be secured. Therefore, for example, the lower limit of the adhesive force is 0.80 N / 10 mm, but 1.00 N / 10 mm or more. Is preferable.

Further, the bending strength of the composite structure in this case is preferably 0.01 MPa or more and 0.2 MPa or less. The resin foam layer may be a stack of a plurality of resin foams.

It is desirable that the dimensional change rate at the time of heating at 100 ° C. for 10 minutes in the plane direction of the laminated body of the reinforcing layer and the metal foil layer to be attached to the resin foam layer is 5.0% or less.

According to the present invention, since the relationship between the adhesive strength between the duct and the composite structure and the apparent flexural modulus of the composite structure has a predetermined relationship, a gap is generated between the composite structure and the duct. Can be suppressed. For example, if the apparent flexural modulus of the composite structure is too high, the composite structure may peel off on the inner surface of the duct when the composite structure is bent from the inner surface of the duct to a portion related to the flange portion. In particular, since high-temperature wind may always flow in the duct or vibration may be transmitted at all times, there is a risk that the composite structure may fall off in the duct. However, if the composite structure in the present invention is used, the composite structure may be used. Since the apparent flexural modulus of the body and the adhesive layer provided on one surface of the composite structure have a predetermined relationship, peeling of the composite structure can be more reliably suppressed.

The bending strength of the composite structure is preferably 0.01 MPa or more. This is because if the bending strength is too low, buckling of the resin foam occurs when the composite structure is bent, and as a result, a gap is generated between the duct and the composite structure.

Further, if the bending strength of the composite structure is 0.2 MPa or less, the repulsive force is small and the composite structure can be easily bent when the composite structure is bent from the inner surface of the duct to the flange portion.

Further, if a plurality of resin foams are laminated to form a resin foam layer, the heat insulating property inside the duct can be further improved.

Further, if the heating dimension change rate in the surface direction of the reinforcing layer and the metal foil layer attached to the resin foam layer is 5.0% or less, the laminated structure of the resin foam and the reinforcing layer is used during heating. Warpage and the like are unlikely to occur, and it is possible to suppress peeling of the composite structure and formation of a gap between the composite structure and the duct.

According to the present invention, it is possible to improve the efficiency of heat insulation construction of the duct, to satisfactorily bond the composite structure to the duct, and to provide a composite structure in which the material does not scatter or fall off inside the duct. ..

The figure which shows the duct heat insulation structure 1. FIG. 3 is a cross-sectional view of the composite structure 7.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a duct heat insulating structure 1. The duct heat insulating structure 1 includes a duct 3 and a composite structure 7 and the like.

The duct 3 has a flange portion 5. The flange portion 5 is formed so as to bend outward at an angle of approximately 90 degrees with respect to the main body portion of the duct 3. The ducts 3 are connected to each other by facing the flange portions 5 of the pair of ducts 3 and fixing them with a fixing member (not shown).

FIG. 2 is an enlarged view of part A of FIG. 1 and is a diagram showing details of the composite structure 7. The composite structure 7 is a member used for heat retention of a duct attached to a building or the like, and is mainly composed of an adhesive layer 9, a resin foam layer 11, a reinforcing layer 13, a metal leaf layer 15, and the like. An adhesive layer or another layer may be present between the configurations.

The resin foam constituting the resin foam layer 11 is produced by using, for example, a polyolefin-based resin foam, a nitrile resin-based rubber foam, an olefin-based resin copolymerized rubber foam, or the like. For example, the resin foam is produced into a sheet by extrusion or roll processing after extrusion. In this case, since the extrusion direction and the roll processing direction are almost the same, the extrusion direction is defined as the processing direction. Further, the resin foam can be used without particular limitation as long as it satisfies the above-mentioned mechanical properties. A polyethylene resin is desirable from the viewpoint of workability and shape followability.

The polyethylene-based resin used may be a homopolymer or a copolymer of an ethylene-based monomer, and is not particularly limited. For example, low-density polyethylene, high-density polyethylene, or linear low-density. Preferably used is polyethylene or the like, or an ethylene-based copolymer such as an ethylene-propylene copolymer, an ethylene-butene copolymer, an ethylene-vinyl acetate copolymer, or an ethylene-acrylic acid ester copolymer. Be done. Of these, polyethylene and ethylene-vinyl acetate copolymers are particularly preferably used. These polyolefin-based resins may be used alone or in combination of two or more.

Further, the resin foam may contain a bubble nucleating agent, a heat stabilizer, a processing aid, a lubricant, an impact modifier, a flame retardant, a filler, an antioxidant, an ultraviolet absorber, a light stabilizer, and a pigment, if necessary. Etc. may be added as appropriate. Further, the resin foam may or may not be crosslinked, but the crosslinked foam is more preferable in consideration of the dimensional change.

Further, the foaming ratio of the resin foam is preferably 20 to 70 times, more preferably 30 to 50 times, and when the foaming ratio is less than 20 times, the heat insulating property is insufficient and exceeds 70 times. The repulsive force is reduced, and the sealing performance of the flange portion may be reduced. For example, considering both the heat insulating property and the sealing property of the flange portion, 20 to 50 times is more preferable.

The thickness of the resin foam layer 11 is preferably 4 mm to 15 mm. If the thickness of the resin foam layer 11 is less than 4 mm, the heat insulating property is insufficient, and if it exceeds 15 mm, when the resin foam layer 11 is attached to the inside of the duct 3, the flow path in the duct 3 is significantly blocked and the pressure loss increases. Therefore, the original ventilation function cannot be exhibited.

The resin foam layer 11 may be a stack of a plurality of resin foams. At this time, the resin foam may have two or three layers. The resin foam layer can be laminated by adhesion. By doing so, the foaming ratio and the thickness of the foam layer can be appropriately changed. For example, by increasing the foaming ratio from the inner layer and providing a foam layer with a thin foam layer on the outer layer, the inner layer is a high-strength layer and the outer layer is a low-strength layer, so that the composite structure has higher heat insulation. A balance between performance and strength can be obtained.

A reinforcing layer 13 is attached to one surface of the resin foam layer 11. The material of the reinforcing layer 13 is not particularly limited, and for example, a polyethylene resin cloth sheet, a polyester resin cloth sheet, a glass cloth sheet, a polyethylene resin sheet, a polyethylene resin film, a vinyl chloride resin sheet, etc. Examples thereof include a vinyl chloride resin film, a polyethylene resin sheet, and a polyethylene resin film. For the present invention, a polyethylene-based resin cloth sheet, a vinyl chloride-based resin sheet, a polyester-based resin film, or the like is desirable in consideration of flexibility.

A metal foil layer 15 is further attached to the surface of the reinforcing layer 13. The material of the metal foil layer 15 is not particularly limited, and examples thereof include aluminum foil, titanium alloy foil, nickel alloy foil, bronze foil, tin foil, zinc alloy foil, and brass foil. Aluminum foil is preferable from the viewpoint of actual usage conditions, material price, and the like.

The total thickness of the metal foil layer 15 and the reinforcing layer 13 is preferably 20 μm to 300 μm, more preferably 20 to 150 μm. If the total thickness is less than 20 μm, it is easily broken in terms of strength and is easily damaged during handling after being attached to the duct 3. On the contrary, if the total thickness exceeds 300 μm, the rigidity becomes too large and it becomes difficult to bend and bond.

Considering the adhesive stability when the temperature changes, the dimensional change after heating by allowing the reinforcing layer 13 and the metal foil layer 15 to stand in a constant temperature bath for 100 ° C. for 10 minutes in the surface direction of the laminated body. The rate is preferably 5.0% or less, and more preferably 4.0% or less.

To change the dimensions, prepare a laminate of only the reinforcing layer 13 and the metal foil layer 15, measure the dimensions before heating, allow the laminate to stand in a constant temperature bath at 100 ° C. for 10 minutes, and then place the laminate. It can be obtained by taking it out, measuring the dimensions, and calculating the dimensional change rate with respect to the dimensions before heating. By setting the dimensional change rate of the laminated body of the reinforcing layer and the metal foil layer to a predetermined value or less, the dimensional change rate of the laminated body and the foam can be reduced, so that it was used at a high temperature in the duct 3. At this time, the deformation (warping) of the composite structure 7 can be suppressed.

For example, if the dimensional change rate of the laminated body of the reinforcing layer 13 and the metal foil layer 15 is large, the entire composite structure 7 may warp due to shrinkage at a high temperature, and the adhesion to the duct 3 may be peeled off.

An adhesive layer 9 is provided on the surface of the resin foam layer 11 opposite to the reinforcing layer 13. The types of the adhesive layer 9 include, for example, solvent-based, hot-melt-based, emulsion-based, and butyl rubber, chloroprene rubber, styrene-butadiene rubber, nitrile-butadiene rubber, acrylic, silicon-based, polyamide-based, and urethane-based. , Polyester and other resin types, but are not particularly limited. However, in consideration of ensuring the adhesiveness at the time of heating, an acrylic-based to silicon-based adhesive material is preferably used. Acrylic adhesives are the most suitable, especially from the viewpoint of material cost.

In addition, based on the method described in JIS Z 0237, the adhesive strength of the adhesive layer 9 when measured under the conditions of using a polypropylene plate for the adherend, a peeling angle of 90 °, and a peeling speed of 50 mm / min is 1. It is desirable that it is 0N / 10mm or more. By doing so, it is possible to secure the minimum adhesive force required for adhering the composite structure 7 to the duct 3.

Here, since the heat insulating material used for the duct 3 must have the fire resistance performance specified by the Ministry of Land, Infrastructure, Transport and Tourism, when an organic material-based foam is used as the heat insulating material, its performance is one of the problems.

On the other hand, in the composite structure 7, since the reinforcing layer 13 and the metal foil layer 15 are attached to the outer surface of the resin foam layer 11, the resin foam layer 11 is not exposed to the outer surface, and the resin foam layer is not exposed. It is possible to suppress the burning of 11. That is, the metal foil layer 15 plays a role of dispersing heat and a role of breaking the contact between the internal resin foam layer 11 and the outside air. Therefore, even if the resin foam layer 11 inside is shrunk or deteriorated by heat, it is possible to suppress the occurrence of combustion (exothermic reaction). Further, the reinforcing layer 13 and the metal foil layer 15 have an effect of suppressing contamination and deterioration of the resin foam layer 11, and suppress the detachment of the resin foam layer 11.

As shown in FIG. 2, the composite structure 7 is attached to the inner wall surface of the duct 3 so that the metal leaf layer 15 is on the flow path surface side. Further, as shown in FIG. 1, the composite structure 7 is a sheet forming the resin foam layer 11 with the metal foil layer 15 as the flow path surface side in order to reduce the number of seams when the resin foam layer 11 is attached. Along with the processing direction of the shaped resin foam along the flow path surface, it is attached to the inner wall surface of the duct 3 to cover the entire flow path surface of the duct 3, and the flange portion 5 is bent along the flange portion 5 to form a flange. It is sandwiched between the parts 5. At this time, in many cases, the resin foam layer 11 is not bent in the width direction but is bent in the processing direction. If the reinforcing layer 13 is a resin cloth sheet, unevenness is formed by the reinforcing layer 13, and the metal foil layer 15 has an uneven shape corresponding to the unevenness of the reinforcing layer 13. Therefore, when bent, the metal leaf layer 15 easily follows the deformation and is hard to break.

Here, if a gap is formed between the composite structure 7 and the inner surface of the duct 3, there is a risk that the composite structure 7 may fall off. Therefore, it is necessary to securely bond the composite structure 7 and the duct 3. However, in the bent portion of the composite structure 7, a gap is likely to be generated between the composite structure 7 and the duct 3 due to the restoring force (repulsive force) against the bending of the composite structure 7. Therefore, even in such a portion, the composite structure 7 needs to be securely adhered without being peeled off from the duct 3.

Here, as described above, the composite structure 7 is a laminate having a resin foam layer 11, a reinforcing layer 13, and a metal foil layer 15, and the interfaces of the respective layers are heat-sealed or fused to each other. It is glued. Further, the flexural modulus of the materials constituting the composite structure 7 is different from each other. Therefore, the bending deformation behavior of the composite structure 7 is determined by the flexural modulus of each material, the thickness of each material, or the stacking order of each material. The inventors have found that the peeling behavior of the composite structure 7 with respect to the duct 3 can be evaluated by the elastic rebound force at the time of bending deformation of the composite structure 7.

More specifically, the adhesive strength (A) (N / 10 mm) of the adhesive layer 9 and the processing direction of the resin foam layer 11 by arranging the metal leaf layer 15 of the composite structure 7 excluding the adhesive layer 9 on the surface. The apparent flexural modulus (B) (MPa) when the bending test is performed according to the above is equal to or higher than the flexural modulus of the resin foam layer 11, and further satisfies (B) / (A) ≤ 4.0. In this case, it was found that the composite structure 7 can be adhered without a gap without peeling even when the composite structure 7 is bent and attached to the bent portion of the duct 3. At this time, the adhesive strength of the adhesive layer is preferably in the range of 0.80 N / 10 mm to 4.00 N / 10 mm. The upper limit of the flexural modulus of the composite structure is preferably 8.0 MPa or less. By setting the adhesive strength of the composite structure and the apparent flexural modulus within the above range, the resin composite of the present invention can be appropriately adhered to the flange portion of the duct with an adhesive to prevent peeling. it can.

As described above, the adhesive strength of the adhesive layer 9 is measured under the conditions of a polypropylene plate as the adherend, a peeling angle of 90 °, and a peeling speed of 50 mm / min, based on the method described in JIS Z 0237. Will be done.

The flexural modulus is usually measured based on the method of JIS K 7221-2. Here, the apparent flexural modulus of the composite structure 7 differs depending on which layer is arranged on the outer surface of the composite structure 7 because the thickness and rigidity of each material constituting each layer are different. Conceivable. Therefore, when the bending test of the composite structure 7 is performed, the bending portion is arranged parallel to the processing direction of the resin foam layer 11 of the composite structure 7 in order to arrange the composite structure 7 in the same manner as the actual usage. It is necessary to arrange the metal foil layer 15 so as to be arranged on the outer peripheral side of the bent portion and perform the bending test.

The bending strength of the composite structure 7 when the metal leaf layer 15 is arranged so as to be arranged on the outer peripheral side of the bent portion and the bending test is performed is preferably 0.2 MPa or less. When the bending strength of the composite structure 7 is large, the repulsive force when bent is large, and when bent, a gap is likely to be generated between the composite structure 7 and the duct 3.

As described above, according to the present embodiment, by covering the inner surface of the duct 3 with the composite structure 7 over the entire surface, dew condensation in the duct 3 can be suppressed. Further, by bending the composite structure 7 and sandwiching the composite structure 7 between the flange portions 5, a gap is not formed between the flange portions 5 and leakage can be prevented.

Further, the adhesive strength (A) (N / 10 mm) of the adhesive layer 9 and the apparent flexural modulus (B) (MPa) of the composite structure 7 excluding the adhesive layer 9 are the bending elastic modulus of the resin foam layer. Even if the composite structure 7 is bent and attached to the flange portion 5 in order to further satisfy (B) / (A) ≤ 4.0, the composite structure 7 is peeled off from the duct 3 and both are formed. It is possible to prevent the formation of a gap between the two. Further, by setting the adhesive force (A) of the adhesive layer 9 within a predetermined range, the composite structure 7 can be stably adhered to the flange portion of the duct or the like. It is desirable that the upper limit of the adhesive strength (A) of the adhesive layer is equal to or less than the tear strength of the resin foam used. If the adhesive strength is equal to or greater than the tear strength of the resin foam, the material of the foam will break instead of peeling the adhesive when the material is to be peeled off. In that case, for example, when the foam is easily broken when it is applied once and then reattached, it can be said that an excessively high adhesive force is not practically preferable. Actually, the upper limit of the adhesive strength is 4.00 N / 10 mm even if the difference in the type of resin foam to be applied is taken into consideration. Further, the lower limit of the adhesive force is as long as the adhesive force for stably adhering the composite structure can be secured. Therefore, for example, the lower limit of the adhesive force is 0.80 N / 10 mm, but 1.00 N / 10 mm or more. Is preferable.

Here, the apparent flexural modulus of the composite is larger than the flexural modulus of the resin foam because it is reinforced by the reinforcing layer and the metal foil layer, but the upper limit of the apparent flexural modulus is the composite. From the viewpoint of peeling of the structure, 8.0 MPa or less is preferable, and 6.0 MPa or less is more preferable. The lower limit value is not particularly limited, and may be appropriately set within a range that satisfies (B) / (A) in relation to the adhesive strength. The adhesive strength can also be adjusted by changing the thickness of the pressure-sensitive adhesive layer, changing the type of pressure-sensitive adhesive or the type of curing agent, or the like. The thickness of the adhesive layer is preferably about 10 μm to 100 μm. If it is too thin, the desired adhesive strength cannot be exhibited, and if it is too thick, the solvent tends to remain during processing, making it difficult to control the manufacturing method, and the shear adhesive strength decreases, causing the heat insulating material to shift after pasting. The adhesive type is not particularly limited as long as the above conditions are satisfied, and for example, urethane-based, olefin rubber-based, acrylic-based, and silicon-based can be used. The optimum curing agent type may be selected for the pressure-sensitive adhesive type, and isocyanate-based, urethane-based, epoxy-based, and the like can be used.

A composite structure under various conditions was formed, and the adhesive strength, the apparent flexural modulus, the apparent thermal conductivity, the heat insulating performance, and the adhesiveness to the inside of the duct were evaluated. The adhesiveness to the inside of the duct was evaluated using the same structure as in FIG.

The foaming ratio of the resin foam used in the composite structure was determined by the underwater substitution method (JISK7112). Further, an electronic balance AG204 manufactured by Metradredo Co., Ltd. was used for measuring the weight of the resin foam.

The adhesive strength was measured based on the method described in JIS Z 0237 under the conditions of using a polypropylene plate as an adherend, a peeling angle of 90 °, and a peeling speed of 50 mm / min.

Regarding the apparent flexural modulus and bending strength, a three-point bending test was carried out on the composite structure before forming the adhesive layer based on the method of JIS K 7221-2. Specifically, the test piece is cut out parallel to the processing direction of the resin foam constituting the composite structure, the distance between the fulcrums is 100 mm, the width of the test piece is 25 mm, and the metal foil layer is arranged on the outer peripheral side of the bent portion. The thickness of the test piece was measured using the total thickness of the test piece under the condition of a test speed of 10 mm / min.

Regarding the thermal conductivity of the heat insulating material, any material showing 0.023 to 0.045 (W / m · K) in the JIS A 1412 measurement method at room temperature can be used without particular limitation. It is not realistic to use a heat insulating material of 0.023 (W / m · K) or less because it is costly to manufacture a heat insulating material having a thermal conductivity lower than that of air for a long period of time. If the thermal conductivity is too high, the desired heat insulating performance cannot be exhibited as a heat insulating material for ducts. Regarding the thermal conductivity, the thickness of the composite structure as a composite structure at a measurement temperature of 23 ° C. based on the method of JIS A 1412-2 (heat flow meter method) with respect to the composite structure before forming the adhesive layer. The apparent thermal conductivity in the vertical direction was measured.

Regarding the heat insulation performance, after laminating the composite structure and the duct, connect ASE-100 (manufactured by Espec Co., Ltd., air volume: 10.3 m ³ / min) as a blower, and the duct to which the composite structure is pasted. The inside of the duct was set to 12 ° C and the outside of the duct was set to 25 ° C, and the surface temperature of the outer surface of the duct was measured. If there is, it was judged as ×.

For adhesiveness, prepare a co-plate type square duct with a side of 300 mm square, and attach the composite structure from the lower end of the flange on one side to the flange end on the other side through the duct body, and at that time, the bent part floats. , It was evaluated whether there was any peeling.
The test results for the combination of various materials are shown in Tables 1 and 2.

(Example 1)
As the resin foam layer, a cross-linked polyethylene foam with a foaming ratio of 40 times (Furukawa Denki Kogyo Co., Ltd. Funen Ace (registered trademark): thickness 4 mm) is used, and the surface is heated with an infrared heater while polycloth Polyethylene aluminum foil (manufactured by Plastic Industry Co., total thickness 110 μm) was laminated. Further, a release paper coated with BPS6080TFK (manufactured by Toyochem Co., Ltd .: acrylic adhesive) was attached to the back surface of the resin foam layer and transferred to produce a composite structure.

(Example 2)
The same as in Example 1 except that the resin foam layer was made into Funen Ace (registered trademark) having a thickness of 10 mm.

(Example 3)
The same as in Example 1 except that the reinforcing layer was made of glass cloth and the thickness of the resin foam layer was 6 mm.

(Example 4)
The same as in Example 1 except that the resin foam layer was Foam Ace (registered trademark) manufactured by Furukawa Electric Co., Ltd. with a foaming ratio of 30 times and the thickness was 8 mm.

(Example 5)
The same as in Example 1 except that the reinforcing layer was a PET film (total thickness 20 μm) and the foam was a rubber foam (K-FLEX (registered trademark) manufactured by Lisolante K-Flex).

(Example 6)
The same as in Example 2 except that the pressure-sensitive adhesive was SK Dyne 1717DT (manufactured by Soken Chemical Co., Ltd .: acrylic pressure-sensitive adhesive).

Here, as a result of carrying out each of the above evaluations on the samples shown in Table 1, the adhesive strength (A) of the adhesives of Examples 1 to 6 was 1.14 to 3.5 N / 10 mm, which was 0.8. Satisfies the range of ~ 4.0N / 10mm. Further, the apparent flexural modulus (B) was 1.45 to 5.50 MPa, which satisfied 8.0 MPa or less. (B) / (A) showing the relationship between the apparent flexural modulus (B) and the adhesive force (A) of the adhesive layer when the metal foil layer is placed on the surface and the bending test is performed are all 4 It was 0.0 or less, and the apparent flexural modulus and the adhesive strength of the adhesive layer were obtained to satisfy the provisions of the present invention for each of the materials of the examples. In all the examples, the adhesiveness was acceptable, which was consistent with the results of (B) / (A) showing the relationship between the apparent flexural modulus and the adhesive force of the adhesive layer.
Furthermore, all the heat insulating properties were acceptable, and it was excellent as a composite structure for duct heat insulating.

(Comparative Example 1)
The same as in Example 1 except that the resin foam was Foam Ace (registered trademark) manufactured by Furukawa Electric Co., Ltd. with a foaming ratio of 20 times and the thickness was 10 mm. As a result, the apparent flexural modulus increased and the (B) / (A) values deviated from the target values. As a result, the bent portion of the flange was lifted, and the adhesiveness evaluation was rejected. became. In addition, the heat insulation was also unacceptable due to the deterioration of the apparent thermal conductivity.

(Comparative Example 2)
The same procedure as in Example 4 was carried out except that the amount of the adhesive material applied was reduced. As a result, the adhesive strength was reduced, and the adhesive strength was peeled off at the bent portion near the flange portion, resulting in a failure in the adhesiveness.

Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1 ………… Duct heat insulation structure 3 ………… Duct 5 ………… Flange part 7 ………… Composite structure 9 ………… Adhesive layer 11 ………… Resin foam layer 13 ………… Reinforcing layer 15 ………… Metal Foil layer

Claims (4)

It is a composite structure for buildings,
Adhesion provided on the surface of the resin foam layer opposite to the reinforcing layer, the reinforcing layer attached to the resin foam layer, the metal foil layer attached to the reinforcing layer, and the reinforcing layer. Layer and
Equipped with
The adhesive strength (A) (N / 10 mm) of the adhesive layer and the metal leaf layer of the composite structure excluding the adhesive layer are arranged on the surface and a bending test is performed along the processing direction of the resin foam layer. The apparent flexural modulus (B) (MPa) of the resin foam layer is equal to or higher than the flexural modulus of the resin foam layer, and (B) / (A) ≤ 4.0.
A composite structure characterized by satisfying. The composite structure according to claim 1, wherein the bending strength of the composite structure is 0.2 MPa or less. The composite structure according to claim 1 or 2, wherein the resin foam layer is a stack of a plurality of resin foams. The feature is that the dimensional change rate at the time of heating at 100 ° C. for 10 minutes in the plane direction of the laminated body of the reinforcing layer and the metal foil layer to be attached to the resin foam layer is 5.0% or less. The composite structure according to any one of claims 1 to 3.

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