JPS60174642A - Laminated heat-insulating material made of synthetic resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin laminated heat insulating material.

Synthetic resin insulation materials have been widely used as insulation 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 boards have the disadvantage of being easily permeable to moisture, and that if they were used for building roofs, walls, etc., they would cause problems.

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 considered it necessary to improve these drawbacks. However, since water vapor permeability is based on the essence of polystyrene, and polystyrene has water vapor permeability several to 70 times higher than polyolefin or polyvinyl chloride, it is not easy to improve it. It was considered.

Foam boards that have been supplied as insulation materials up until now have mostly been made 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, the only processed products available were foam boards with non-foamed aluminum foil or synthetic resin films pasted on the surface. This has the effect of reducing water vapor permeability, but since aluminum foil and non-foamed film are harder to adhere to than foam board, leaving it exposed makes it difficult to adhere other materials to this surface. It showed the disadvantage of being difficult.

In the field of packaging films, laminated products with various materials are made, but laminated materials have hardly been considered for use as insulation boards. This is because synthetic resin foam boards break easily, and when attempting to bond them together, 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 a polystyrene foam board by laminating the polystyrene foam board with other materials. As a result, when a foamed film of polyethylene, polypropylene, polyvinyl chloride, and vinylidene chloride is made and this film is sandwiched between polystyrene foam boards, the polystyrene foam boards have improved water vapor permeability. I learned that. However, if a polystyrene foam board is brought into direct contact with a foamed film of polyethylene, polypropylene, polyvinyl chloride, or polyvinylidene chloride, even if the film is softened or melted to bond, it will not adhere strongly. However, during that time, polyvinyl acetate, polycyanoacrylate, epoxy polymers, styrene, etc.
When butadiene rubber, butyl rubber, or chloroprene rubber is interposed, the foamed polystyrene plate strongly adheres to the foamed film and becomes an integral part without crushing the air bubbles, reducing water vapor permeability as a whole and improving mechanical strength. I confirmed that it was reached. This invention was made based on such confirmation.

In this invention, a foamed film or sheet of a polymer mainly composed of ethylene, propylene, vinyl chloride, or vinylidene chloride is sandwiched between foamed styrenic resin sheets or boards.
This invention relates to a synthetic resin laminated heat insulating material that is bonded with an epoxy polymer, styrene-e-butadiene rubber, butyl rubber, or chloroprene rubber to form an integral structure.

The synthetic resin laminated heat insulating material according to the present invention has a foamed sheet or board made of styrenic resin located on the surface, and a foamed film or sheet made of a polymer mainly composed of ethylene, propylene, vinyl chloride, or vinylidene chloride between them. The films or sheets are sandwiched together and bonded together with vinyl acetate, cyanoacrylate, epoxy polymer, styrene-butadiene rubber, butyl rubber, or chloroprene rubber.

The foamed styrene resin sheet or board used in the present invention is no different from those used as synthetic resin heat insulating materials in isolation. This is made by pressurizing a foaming agent into a styrene-based resin and vaporizing or decomposing the foaming agent in the molten state of the styrene-based resin to generate gas. Here, a sheet refers to a relatively thin one having a thickness of one layer, and a board refers to a relatively thick one. Its thickness is 1.2W11
Anything within the range of 1+ to 700 mm can be used. The styrene resin is not limited to a styrene homopolymer, but may also be a copolymer thereof.

The foamed film or sheet used in this invention,
It is made from a polymer based on ethylene, propylene, vinyl mide, or vinylidene chloride.

The polymer is not limited to a homopolymer of these monomers, but may also be a copolymer. The copolymer contains 50% by weight of the above monomers.
It is necessary to account for at least the following.

Although extrusion mode is preferably used to make such polymeric foamed films or sheets, calendering rules can also be used. Here, a film is a relatively thin film, more specifically, a film with a thickness of approximately
7,000 microns, and a sheet is a relatively thick one, more specifically, the thickness is about / to /
It means the θ fin.

In this invention, the above synthetic resin or rubber is used as the styrene resin foam. As the synthetic resin or rubber, vinyl acetate polymers, cyanoacrylate polymers, epoxy polymers, styrene-butadiene rubber, butyl rubber, and chloroprene rubber are used.

Examples of vinyl acetate polymers include polyvinyl acetate,
Vinyl acetate/acrylic ester copolymer, ethylene/
Vinyl acetate copolymers and even polymer mixtures of polyethylene and polyvinyl acetate can also be used. In this case, even though it is called a vinyl acetate-based copolymer, the vinyl acetate content is small and the vinyl acetate is
Ethylene can be used even if it accounts for 50% by weight or more. This polymer may be applied as an emulsion to the surface of the styrenic resin foam or foamed film, or it may be formed into a film and then layered on the styrenic resin foam or foamed film. good.

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 harden. It is better.

Styrene-butadiene rubber, butyl rubber, and chloroprene rubber can be used for adhesion by coating the emulsion on a styrene-based resin foam or foamed film, but once formed into a film,
This can also be stacked on a styrenic resin foam or a foamed film for adhesion. Further, these rubbers can also be used for adhesion by dissolving the rubber in an organic solvent, applying it to the foamed film, volatilizing the solvent, and then pressing the styrenic resin foam thereon.

The laminated heat insulating material according to the present invention has the above-mentioned foamed film or sheet 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. They are all one. 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 styrenic 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 2θ or 5oKy/lr when expressed as density.
t is desirable. Further, the bubbles are preferably fine, with a diameter of about 0.2 to 2. Preferably, it is about the size of a θ fin.

An example of the laminated heat insulating material according to the present invention is shown in partially cutaway perspective views in FIGS. 1 and 2. In Figures 1 and 3, / to 3 are foamed styrene-based resin boards, d and j are their skin layers, and Hz, , h, 7, and 3 are mainly made of ethylene, propylene, vinyl chloride, or vinylidene chloride. F is a foamed film of a polymer, and F is a layer of adhesive polymer or rubber. The foamed styrene resin board is
As shown in FIG. 2, it may exist in three or more layers.

In the laminated heat insulating material according to the present invention, foam board/3
The foamed film GS 7 is sandwiched between them, and they are the adhesive layer! They are glued together and become one piece. More specifically, the foamed film g12 spreads over the entire seam of the foamed board/3, the adhesive layer g spreads over the entire surface or in spots, and the adhesive layer ♂ The surface of the foamed film g12 is firmly adhered to the foamed film g12. Therefore, even if you try to peel off the laminated insulation material into a board/3,
Does not peel off easily.

To make the laminated heat insulating material of the present invention shown in FIG. 1, it is desirable to proceed as follows. First, prepare three extrusion machines and connect them to the same nozzle.The first extruder makes a polystyrene foam plate, the second extruder makes a polyethylene foam film, and the third extruder An ethylene/vinyl acetate copolymer film is made using a machine, and these are introduced into a single mouthpiece and bonded together.

More specifically, the first extruder is supplied with polystyrene mixed with a flame retardant, a cell regulator, and a colorant, and dichlorodifluorop-methane and methyl chloride as blowing agents in a weight ratio. A blowing agent was mixed in a ratio of 70 parts by weight to 10 θ parts by weight of the resin, and this mixture was supplied to the die at 7.20°C. Adjust the resin extruded from the nozzle to a thickness of 2.5ta.
A foam with skin shoulders having a width of n, a width of 2jθ fins, and a density of daθKgld is obtained.

This is called material A.

High-density polyethylene is supplied to the second extruder, in which Cellmic 0APjO (7 parts by weight) as a foaming agent is mixed in advance with parts by weight of polyethylene 10θ. In this nozzle, material A is extruded from a 1° micron wide slit located in the middle of the extrusion slit, and foamed to about 7 times its thickness to a thickness of 2θO microns and a width of 2.5 microns.
I made 7 sheets of 0m film. This is called material B.

An ethylene-vinyl acetate copolymer with a vinyl acetate content of approximately 70% by weight is supplied to the third extruder, and is fed into a nozzle where materials A and B are made. Extruded from a slit located at , thickness 75 microns, width 2.5
I made two films of 0txs. Let this be material 0.

In the extruded state, three types of resin are extruded from the seven nozzles, and in order from the top: material A1 material 0, material B1 material 01
Material A is extruded in this order, overlapping each other. These materials A and B.

0 in contact with each other, these materials are strongly adhered to each other, resulting in a strong foam.

This is the laminated heat insulating material according to the present invention. The water vapor permeability of material A and the laminated insulation material is J engineering SZθ2θ! When measured according to , Material A showed 0.2♂2/m'-hr, and the laminated heat insulating material showed θ,/, 2y/-·hr.

The laminated heat insulating material according to the present invention is made by sandwiching a foamed film or sheet between foamed styrene resin sheets or boards, and interposing an adhesive layer between them so that the laminated insulation material is not exposed on both the front and back sides. The material used is a styrene resin sheet or board.

Therefore, the surface can be processed more easily than the case where aluminum foil or polyoleain film is attached to the surface.

That is, it can be attached by applying an adhesive such as asphalt to the surface as it is, and plywood, gypsum board, cloth, etc. can be easily attached to the surface with the adhesive.

In addition, in the laminated heat insulating material according to the present invention, the materials of the foamed film include ethylene, propylene, vinyl mide,
Or, since a polymer mainly composed of vinylidene chloride was used,
This prevents water vapor from permeating and creates a lightweight and strong film. These polymers are
It has poor adhesion to styrene resin, and if left untreated, it will quickly peel off from the styrene resin foam even if it is fused. However, in the laminated insulation material according to the present invention, between the styrene resin foam and the foamed film, a vinyl acetate-based, cyanoacrylate-based, or epoxy-based polymer,
Since styrene-butadiene rubber, butyl rubber, or chloroprene rubber was used for adhesion, the foam and the foamed film were firmly adhered to each other, and the whole formed a strong laminate. This adhesive strength is so strong that if you forcefully peel it off, pieces of foamed styrene resin will definitely stick to the entire surface of the foamed film. Moreover, because of the foamed film, the water vapor permeability is reduced, the heat insulation properties are improved, the whole is strong, and it is less likely to break when bent, so it is less likely to break. Since the laminated heat insulating material of the present invention brings such advantages, both practical values are large.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are partially cutaway perspective views of a synthetic resin laminated heat insulating material according to the present invention. In the figure, / to 3 are foamed styrene resin sheets or boards, Da and J are the skin layers, 2 and 2 are foamed films, and ♂ is an adhesive layer.

Claims (1)

[Claims] A foamed film or sheet of a polymer mainly composed of ethylene, propylene, vinyl chloride, or vinylidene chloride is sandwiched between foamed styrene-based resin sheets or boards, and a foamed film or sheet of a polymer mainly composed of ethylene, propylene, vinyl chloride, or vinylidene chloride is sandwiched between foamed styrene-based resin sheets or boards, and a vinyl acetate-based, cyanoacrylate-based, or epoxy-based polymer is A synthetic resin laminated insulation material that is bonded with , styrene-butadiene rubber, butyl rubber, or polypropylene rubber.