JPH0132064B2 - - Google Patents

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 a compound resin foam. A compound resin foam is made by producing a large number of small bubbles in a molten compound 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, polystyrene foam boards are attached to the rooftops of buildings overlapping with waterproof sheets, but when rain comes into contact with water vapor, water vapor permeates into the polystyrene foam boards, reducing their 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 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, the only processed materials available were foam boards with non-foamed aluminum foil or synthetic resin films attached to 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 foamed boards, leaving this 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 heat insulating plates. it is,
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 foamed films of polyethylene, polypropylene, polyvinyl chloride, and polyvinylidene chloride were made, and this film was sandwiched between polystyrene foam plates in a sandwich-like manner, the polystyrene foam plates had improved water vapor permeability. I knew. 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, when polyvinyl acetate, polycyanoacrylate, epoxy polymer, styrene-butadiene rubber, butyl rubber, or chloroprene rubber is interposed between them, the foamed polystyrene plate strongly adheres to the foamed film without crushing the air bubbles. It was confirmed that, as a whole, water vapor permeability decreased and mechanical strength improved. 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. epoxy polymer,
The present invention relates to a synthetic resin laminated thermal material that is bonded with styrene-butadiene rubber, butyl rubber, or chloroprene rubber to form a single unit.

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 in between. 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 sheet or board of styrene resin used in this invention includes the following:
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.

The expanded film or sheet used in this invention is made of polymers based on ethylene, propylene, vinyl chloride, or vinylidene chloride. The polymer is not limited to a homopolymer of these monomers, but may also be a copolymer. It is necessary that the above monomer accounts for 50% by weight or more of the copolymer. Although extruders are preferably used to make foamed films or sheets of such polymers, calender rolls may also be used. Here, film refers to something relatively thin, more specifically, about 50 to 1000 microns thick, and sheet refers to something relatively thick, more specifically, about 1 to 10 mm thick. It means something.

In this invention, synthetic resin or rubber is used to bond the styrene resin foam to the foamed film or sheet. Synthetic resins or rubbers include vinyl acetate polymers, cyanoacrylate polymers, epoxy polymers, styrene, etc.
Uses butadiene rubber, butyl rubber, and chloroprene rubber.

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's okay to 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 bonding these 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 resin foam or a foamed film, but it is also possible to use the emulsion after forming it into a film. It is also possible to superimpose it on a styrenic resin foam or a foamed film and use it for adhesion. In addition, these rubbers
It is also possible to dissolve this in an organic solvent, apply it on a foamed film, volatilize the solvent, and then press-bond a styrene resin foam thereto for adhesion.

The laminated heat insulating material according to the present invention has the above-mentioned foamed film or sheet sandwiched in a vacuum, a foamed styrene resin sheet or board is placed on the surface, and these are adhered with the above-mentioned adhesive polymer or rubber. They are united. 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 expressed as the density:
20 to 50 kg/m ³ is preferable. In addition, the bubbles are preferably fine, with a diameter of approximately 0.2
A thickness of about 2.0 mm to 2.0 mm is preferable.

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. Figures 1 and 2
In the figure, 1 to 3 are foamed styrene resin boards, 4 and 5 are their skin layers, and 6 and 7 are foamed films of polymers mainly composed of ethylene, propylene, vinyl chloride, or vinylidene chloride. and 8 is a layer of adhesive polymer or rubber. The foamed styrene resin board may be present in three or more layers, as shown in FIG.

In the laminated insulation material according to the present invention, the foam board 1
Foamed films 6 and 7 are sandwiched between 3 and 3, and are bonded together by an adhesive layer 8 to form a single piece. More specifically, the foamed films 6 and 7 are spread over the entire seam of the foam boards 1 to 3, and the adhesive layer 8 is spread over the entire surface or in spots to form an adhesive. The agent layer 8 firmly adheres the surfaces of the foamed boards 1 to 3 and the foamed films 6 and 7. Therefore, the laminated insulation material cannot be easily peeled off even if an attempt is made to peel it off into the boards 1 to 3.

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 extruders, connect them to the same nozzle, and
A polystyrene foam board is made using the extruder, a foamed polyethylene film is made using the second extruder, and an ethylene/vinyl acetate copolymer film is made using the third extruder. guide it and paste it together.

More specifically, the first extruder is supplied with polystyrene mixed with a flame retardant, a cell control agent, and a colorant, and dichlorodifluoromethane and metal chloride as blowing agents at a weight ratio of 1. vs 1
Using a mixture of 100% foaming agent and 100% foaming agent,
The mixture is mixed under pressure at a ratio of 10 parts by weight to 10 parts by weight, and this mixture is supplied to the nozzle at 120°C. The resin extruded from the die is adjusted to obtain a foam with a skin layer having a thickness of 25 mm, a width of 250 mm, and a density of 40 Kg/m ³ . This is called material A.

feeding high density polyethylene to a second extruder;
To do this, mix 1 part by weight of Cellmic CAP500 as a foaming agent with 100 parts by weight of polyethylene in advance, feed this into the nozzle for making material A, and place it in the middle of the slit for extruding material A in this nozzle. It was extruded through a 60 micron wide slit and expanded to about 4 times its size to produce a film 200 microns thick and 250 mm wide. This is called material B.

The third extruder contains about 10% vinyl acetate by weight.
ethylene vinyl acetate copolymer of material A.
and B into a nozzle, and in this nozzle feed material A.
Extrusion from the gap located between and material B, thickness
I made two films of 15 microns and 250 mm wide.
This is called material C.

In the extruded state, three types of resin are extruded from one die, and in order from the top, material A, material C, material B, material C, and material A are extruded in an overlapping state. These materials A, B,
When brought into 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.
Water vapor permeability of material A and laminated insulation material
When measured according to JIS Z0208, material A is 0.28
g/m ²・hr, and the laminated insulation material is 0.12 g/m2・hr.
It showed m ² ·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, processing on the surface is easier than when an aluminum foil or polyolefin 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 insulation material according to the present invention, a polymer mainly composed of ethylene, propylene, vinyl chloride, or vinylidene chloride is used as the foamed film material, which prevents water vapor from permeating. , constitutes a lightweight and strong film. These polymers have poor adhesion to styrene resins, and if left as is, they will quickly peel off from the styrenic resin foam even if they are fused. However, in the laminated insulation material according to the present invention, vinyl acetate, cyanoacrylate,
Since we decided to use an epoxy polymer, styrene-butadiene rubber, butyl rubber, or chloroprene rubber for adhesion, the foam and the foamed film adhere firmly, creating a strong laminate as a whole. It consists of This adhesive force is so strong that if you forcefully remove it, pieces of foamed styrene resin will definitely stick to the entire surface of the foamed film. Moreover, because of the foamed film,
Its water vapor permeability is reduced, its insulation properties are improved, and its overall strength is increased, making it less likely to break when bent, and therefore less likely to break. The laminated heat insulating material of the present invention provides such advantages and has great practical value.

[Brief explanation of drawings]

1 and 2 are partially cutaway perspective views of a synthetic resin laminated heat insulating material according to the present invention. In the figure, 1 to 3 are foamed styrene resin sheets or boards, 4 and 5 are their skin layers, 6 and 7 are foamed films, and 8 is an adhesive layer.

Claims (1)

[Claims] 1 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, and a vinyl acetate-based, cyanoacrylate-based, or epoxy-based polymer is Combined, styrene
A synthetic resin laminated insulation material that is bonded with butadiene rubber, butyl rubber, or chloroprene rubber.