JPH0213152Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a synthetic resin laminated heat insulating material.

Synthetic resin heat insulating materials are widely used as heat insulating materials near room temperature or at low temperatures. For example, they were attached to the walls, ceilings, or floors of houses to increase the efficiency of heating and cooling systems. It was also used to construct the walls, ceilings, and doors of cold storage warehouses to improve insulation.

A heat insulating material suitable for such uses is one made of synthetic resin foam. A synthetic resin foam is made by producing a large number of small bubbles in a molten synthetic resin so that the bubbles are independent. As the synthetic resin, styrene resin was preferably used. This is because it has high compressive strength and is easy to install. Such a foam was cut into plates and supplied as plates of a constant thickness.

The inventor found that polystyrene foam board has the disadvantage of being easily permeable to moisture, and that this would cause problems if used for the roofs, walls, etc. of buildings. For example, a polystyrene foam board is attached to the roof of a building overlapping a waterproof sheet, but when water droplets come into contact with it due to rain, water vapor permeates into the polystyrene foam board, reducing its insulation properties. Therefore, the inventor thought that it was necessary to improve these shortcomings. However, since water vapor permeability is based on the essence of polystyrene, and polystyrene has water vapor permeability several to ten times higher than polyolefins or polyvinyl chloride, it is not easy to improve it. It was considered.

Foam boards that have been supplied as insulation materials until now are
The majority consisted of foam only. In other words, there has been little effort to combine foam with other materials and process it into a structure suitable for use as a heat insulating material. However, there were some products that were simply made by pasting aluminum foil or non-foamed synthetic resin film on the surface of a foam board. This has the effect of reducing water vapor permeability, but since aluminum foil and non-foamed film are harder to adhere to than foamed boards, leaving this exposed makes it difficult to adhere other materials to this surface. It showed the disadvantage of being difficult. In addition, in the case of those with aluminum foil pasted on the surface, the aluminum foil itself has good thermal conductivity, so the overall insulation properties are impaired.
Therefore, it was considered unsuitable for insulation.

In the field of packaging films, laminated materials with various materials are made, but laminated materials have hardly been considered as insulation materials. it is,
This is because synthetic resin foam boards break easily, and when attempting to bond them, the bubbles are crushed by heat or solvent, making it difficult to bond them together properly.

The inventor attempted to improve the water vapor permeability of the polystyrene foam board by laminating the polystyrene foam board with other materials. As a result, they learned that when aluminum foil is sandwiched between polystyrene foam plates in a sandwich pattern, the polystyrene foam plates have improved water vapor permeability. In addition, the inventor found that if a polystyrene foam board is made thicker than about 2 mm and aluminum foil is sandwiched between it, the sandwiched aluminum foil will not impede the insulation properties of the polystyrene foam board as a whole. It was confirmed. Furthermore, polystyrene foam board will not adhere to aluminum foil if it is brought into direct contact with aluminum foil, and if you try to adhere it with adhesive, the adhesive will crush the air bubbles in the polystyrene foam, impairing its insulation properties. . However, when a polyvinyl acetate-based, polycyanoacrylate-based, epoxy-based polymer, butadiene rubber-based, butyl rubber-based, or chloroprene rubber-based adhesive is interposed between the adhesives, the bubbles in the foamed polystyrene plate are not crushed, and the foamed polystyrene plate is not crushed. It was confirmed that the material strongly adheres to the film and becomes one, reducing overall water vapor permeability and improving mechanical strength. This idea was made based on such confirmation.

This idea involves sandwiching aluminum foil between foamed styrene resin sheets or boards with a thickness of 2 mm or more.
The present invention relates to a synthetic resin laminated heat insulating material that is bonded with a vinyl acetate-based, cyanoacrylate-based, epoxy-based polymer, butadiene rubber-based, butyl rubber-based, or chloroprene rubber-based adhesive to form an integral structure.

The synthetic resin laminated insulation material according to this invention has a foamed sheet or board of styrene resin placed on the surface, aluminum foil sandwiched between them, and the aluminum foil is made of vinyl acetate, cyanoacrylate, or epoxy polymer. , butadiene rubber, butyl rubber, or chloroprene rubber adhesive.

The foamed sheet or board of styrene resin used in this invention is as follows:
It is no different from the synthetic resin insulation materials that have been used up until now. This is made by pressurizing a blowing agent into a styrene-based resin and vaporizing or decomposing the blowing agent in the molten state of the styrene-based resin to generate gas. Here, the sheet is
It refers to something relatively thin, and board refers to something relatively thick. Its thickness is 2mm
Anything within the range of 100mm to 100mm can be used. The styrene resin is not limited to a styrene homopolymer, but may also be a copolymer thereof.

This idea uses aluminum foil. Aluminum foil is easily torn, so it is sometimes supplied sandwiched between or attached to synthetic resin films, sheets, or paper; however, the aluminum foil used in this invention is Alternatively, it can be bonded to paper and integrated and used as is. Further, the aluminum foil used in this invention may be a vapor-deposited aluminum layer, for example, a polyethylene film or a polyester film with aluminum vapor-deposited on one side. Here, film is something that is relatively thin, more specifically, about 50mm thick.
1000 microns, and a sheet is a relatively thick one, more specifically, a thickness of about 1 to 100 microns.
It means 10mm.

Aluminum foil with a thickness of 5 to 150 microns can be used, but in reality it is 20 microns thick.
to 50 microns is preferred.

This idea uses synthetic resin or rubber to bond the styrene resin foam to the aluminum foil. As the synthetic resin or rubber, vinyl acetate polymers, cyanoacrylate polymers, epoxy polymers, butadiene rubbers, butyl rubbers, and chloroprene rubbers are used. These are synthetic resin adhesives in a broad sense.

As the vinyl acetate polymer, in addition to polyvinyl acetate, vinyl acetate/acrylic acid ester copolymers, ethylene/vinyl acetate copolymers, and even polymer mixtures of polyethylene and polyvinyl acetate can be used. . In this case, even though it is called a vinyl acetate-based copolymer, it can be used even if the vinyl acetate content is small and vinyl acetate accounts for 5 to 50% by weight, and ethylene is 50% by weight or more. It may be hot. This polymer may be applied as an emulsion to the surface of a styrenic resin foam or a foamed film,
Alternatively, the film may be made into a film and then laminated onto a styrene resin foam or a foamed film.

For cyanoacrylate polymers or epoxy polymers, the monomer or prepolymer is applied onto a styrene resin foam or foamed film, and after these are bonded together, polymerization or condensation is performed to cure them. It is better.

For butadiene rubber-based, butyl rubber-based, or chloroprene rubber-based adhesives, the emulsion is applied to styrene resin foam, aluminum foil, or a synthetic resin film or sheet that supports aluminum foil for adhesion. However, it is also possible to form the film into a film, and then layer it on a styrene resin foam, aluminum foil, or other supporting film or sheet for adhesion. In addition, these rubbers can be dissolved in an organic solvent and applied onto aluminum foil or other films or sheets that support it.
After volatilizing the solvent, the styrenic resin foam can be pressed onto the foam for adhesion.

The laminated insulation material according to this invention has an aluminum foil sandwiched in the middle, a foamed styrene resin sheet or board is placed on the surface, and these are bonded together with the above-mentioned adhesive polymer or rubber. . The styrenic resin sheets or boards located on both sides preferably have the same thickness, but may have different thicknesses. Furthermore, it is desirable that the styrene resin foams located on the surface have the same expansion ratio, but they may have slightly different expansion ratios.
The styrene resin foam preferably has a skin layer on its surface, but may not have one. The foaming ratio is
In terms of density, it is desirable to have a density of 20 to 50 kg/m ³ . Further, the bubbles are preferably fine, and preferably have a diameter of about 0.2 to 2.0 mm.

One example of the laminated heat insulating material according to this invention is shown in partially cutaway perspective views in FIGS. 1 and 2. Figures 1 and 2
In the figure, 1 is aluminum foil, 2 is paper or plastic film that supports the aluminum foil 1,
3 is an adhesive layer, 4 is a foamed styrene resin board, and 5 is a skin layer of the resin board 4. The foamed styrene resin board is the second
As shown in the figure, three or more layers may be present.

In the laminated heat insulating material shown in FIG. 1, an aluminum foil 1 and a paper or plastic film 2 supporting the aluminum foil 1 are sandwiched between boards 4, and are bonded together by an adhesive layer 3. . The aluminum foil 1 and the paper or film 2 are spread over the entire seam of the board 4, and the adhesive 3 is present over the entire surface or scattered, and the adhesive 3 is bonded to the board 4 and the aluminum. Foil 1 and paper or film 2 are firmly adhered. Therefore, even if an attempt is made to peel off the board 4 from now on, the laminated heat insulating material will not be easily peeled off.

For example, the laminated heat insulating material of this invention shown in FIG. 1 can be made as follows. First, aluminum foil 1
A bonded product is prepared by pasting on paper, and butyl rubber is fed into a first extruder to coat both the front and back surfaces of the bonded product with a butyl rubber film 3. A foamed polystyrene board 4 extruded from a second extruder is brought into contact with both the front and back surfaces of the thus obtained coating, and the foamed polystyrene board 4 is bonded with butyl rubber to form an integral piece. In this way, the synthetic resin laminated heat insulating material according to this invention is obtained.

In the laminated heat insulating material according to this invention shown in FIG. 2, the aluminum foil 1 is divided into two layers and included in the heat insulating material. An adhesive layer 3 is applied over the entire surface of both the front and back surfaces of each aluminum foil 1, and a polystyrene foam board 4 is further adhered to the surface of the adhesive layer 3, creating a strong laminated insulation material as a whole. It is configured.

In the laminated insulation material of this invention, aluminum foil is sandwiched between foamed styrene resin sheets or boards, and adhesive is interposed between them to form a single piece. It is a styrene resin sheet or board. Therefore, the surface can be processed more easily than the case where aluminum foil or non-foamed synthetic resin film is attached to the surface. That is, it can be attached as is by applying an adhesive such as asphalt to the surface, and plywood, plasterboard, cloth, etc. can be easily attached to the surface with adhesive.

Furthermore, in the laminated heat insulating material according to this invention, since the aluminum foil is sandwiched between foamed styrene resin sheets or boards, the aluminum foil prevents water vapor from permeating. Moreover, although the aluminum foil itself has good thermal conductivity, it is interposed between foamed styrene resin sheets or boards with a thickness of 2 mm or more that have good heat insulation properties, so the aluminum foil has good heat insulation properties as a whole. It has become a thing. In addition, since aluminum is highly stretchable, it can be made into thin and tear-resistant foil, and it is also cheap and light, so aluminum foil is more suitable for use with styrene resin foam sheets than other metal foils such as iron or lead. Or suitable for sandwiching between boards. In addition, although aluminum foil and styrene resin do not adhere strongly as they are, vinyl acetate-based, cyanoacrylate-based, epoxy-based polymers, butadiene rubber-based, butyl rubber-based, or chloroprene rubber-based with adhesive,
Since the foam and the aluminum foil were bonded together in this manner, the foam and the aluminum foil were firmly bonded, and the whole formed a strong laminate. This adhesive is so strong that if you try to force it off, pieces of foamed styrene resin will always stick to the aluminum foil. In this way, the laminated insulation material of this invention has the characteristics of low water vapor permeability and heat insulation properties due to the aluminum foil, and the surface is easy to process, so it has practical value. big.

[Brief explanation of the drawing]

1 and 2 are partially cutaway perspective views of a synthetic resin laminated heat insulating material according to this invention. In the figure, 1 is an aluminum foil, 2 is a paper or plastic film or sheet, 3 is an adhesive layer, 4 is a foamed styrene resin sheet or board, and 5 is a skin layer.

Claims (1)

[Scope of utility model registration request] Aluminum foil is sandwiched between foamed styrene resin sheets or boards with a thickness of 2 mm or more, and vinyl acetate, cyanoacrylate, or epoxy polymers,
A synthetic resin laminated insulation material that is bonded together with a butadiene rubber, butyl rubber, or chloroprene rubber adhesive.