JPS588809Y2 - Composite sheet building material - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a composite sheet-like building material that has excellent heat insulation and dew resistance, and is also easy to process and handle during construction.

More specifically, the intermediate layer is a flexible and moisture-absorbing layer composed of gypsum trihydrate or an inorganic powder and fibrous material mainly composed of gypsum trihydrate and a small amount of a water-resistant binder, and one of the layers is This invention relates to the structure of a composite sheet-like building material in which a sheet-like reinforcing layer made of woven fabric, non-woven fabric, net material, or paper is laminated on one side, and a heat-sealable hydrophobic thermoplastic resin film layer is laminated on the other side. .

Conventionally, organic foams such as polyethylene, polyurethane, and polystyrene, and inorganic insulation materials such as rock wool, glass mats, and asbestos have been used for construction and other purposes.

Although these heat insulating materials are effective against heat, they cause condensation when the temperature on the surface concerned reaches a temperature below the saturated vapor pressure.

This can occur if there is a larger than expected temperature difference between the two sides of the insulation, or if one side becomes extremely humid.

As a result, water droplets may adhere to or run off the surface, causing problems.

In addition, inorganic insulation materials such as rock wool cannot be bent, so they can only be used in flat sheets, and furthermore, when these insulation materials are bonded to other materials, it is usually necessary to use adhesives. However, the use of solvent-based adhesives poses problems such as the danger of odor and ignition during processing operations, and the adhesion speed is also limited by the adhesive coating method.

In particular, in the case of inorganic heat insulating materials, the bonding surface is not smooth and porous, so the adhesive is absorbed, and a large amount of adhesive is required, making it uneconomical.

As a result of intensive studies to obtain a sheet-like building material free from the various drawbacks mentioned above, the inventors of the present invention have developed a method that combines gypsum trihydrate or an inorganic powder and fibrous material mainly composed of gypsum trihydrate and a small amount of a water-resistant binder. The intermediate layer is a flexible and moisture-absorbing layer composed of woven fabric,
A composite sheet made by laminating a sheet-like reinforcing layer made of nonwoven fabric, net-like material, or paper and a heat-sealable hydrophobic thermoplastic resin film layer on the other side has the above-mentioned intermediate layer and sheet-like reinforcing layer. Not only does it have excellent heat insulation and dew-proofing properties, it also has sufficient flexibility and strength to withstand bending, and the presence of a hydrophobic thermoplastic resin film layer allows for safe and easy thermal bonding to objects to be bonded. Furthermore, even after thermal bonding to the adherend, it is possible to peel it off without contaminating the adhesive surface in any way. They found that it is excellent as a building material in both aspects, and completed the present invention.

In particular, when the composite sheet-shaped building material of the present invention is combined with a metal plate such as an iron plate to form a building material, the following significant effects can be obtained in terms of both manufacturing and product properties.

That is, the adhesion between the hydrophobic thermoplastic resin film layer and the metal plate of the composite sheet-like building material of the present invention is achieved by simply heating the metal plate to a temperature at which the resin film layer melts and then pressing the two together. This can be done extremely easily and in a short time without any risk of ignition, and the adhesive strength obtained is sufficient for practical use.On the other hand, the resin film layer interposed on the adhesive surface is not water resistant. Therefore, moisture absorption or dew condensation on the surface of the sheet layer of the present invention is blocked by the resin film layer and does not cause corrosion of the metal plate.

Furthermore, although the adhesion strength of the resin layer to the metal surface is sufficient for practical use, it is conveniently lower than the tensile strength of the composite sheet of the present invention. The sheet-like material of the present invention can be peeled off from the metal surface by pulling it with a corresponding force even afterwards, without contaminating the adhesive surface in any way. This is desirable not only because it facilitates the peeling and removal work, but also because it provides a beautiful finish.

One of the constituent materials of the intermediate layer of the composite sheet-like building material of the present invention
Examples of trihydrate gypsum include naturally occurring gypsum, phosphoric acid byproduct gypsum,
Gypsum obtained by any of the production methods, such as titanium by-product gypsum and flue gas desulfurization by-product gypsum, can be used. Furthermore, a part of these trihydrate gypsum can be mixed with other inorganic substances such as calcium carbonate, clay, aluminum hydroxide, It is possible to replace it with perlite, shirasu balloon, hollow glass, etc.

Examples of the fibrous material include organic fibrous materials such as vinylon or polyester, and inorganic fibrous materials such as rock wool, asbestos, and glass fiber.

Examples of binders used with the above-mentioned gypsum trihydrate or the inorganic powder and fibrous material containing it as a main component include polyvinyl alcohol, polyethylene oxide, sodium polyacrylate, carboxymethyl cellulose polymer, vinyl acetate, and acrylic ester. Thermoplastic polymer emulsions, typified by emulsions of homopolymers and copolymers of vinyl-based monomers, etc., are used.

Examples of the heat-sealable hydrophobic thermoplastic resin film laminated on one side of the intermediate layer constituting the composite sheet-like building material of the present invention include polyvinyl acetate, polyvinyl butyral, polyamide, polyethylene, polypropylene, and polyester. , polystyrene, ethylene-vinyl acetate copolymer, ethylene-(meth)acrylic acid copolymer,
Examples include films made of ionic copolymers or these resins to which rosin and its derivatives, coumaron-indene resin, phenol resin, terpene resin, petroleum wax, chlorinated paraffin, diphenyl chloride, etc. are added. A film of an ionic copolymer known as an ionomer resin is preferred from the viewpoint of adhesiveness and processability.

Further, as a sheet-like reinforcing layer laminated on the other side of the intermediate layer, for reinforcing the above-mentioned intermediate layer and making the sheet-like building material resistant to bending processing, a woven fabric,
Examples include non-woven fabrics, net-like materials, and paper.
The perforated nonwoven fabrics described in No. 6-7274 and Utility Model Publication No. 39-4194 are used not only from the viewpoint of moisture permeability, but also because they have appropriate elasticity due to the large number of pores present in the nonwoven fabric. Therefore, it is particularly preferable not only for its effect as a mere reinforcing material but also for its bending process as a composite sheet-like building material.

Hereinafter, the composite sheet-like building material of the present invention will be explained with reference to the drawings.

That is, FIG. 1 shows an enlarged cross-sectional view in the thickness direction of the composite sheet-like building material of the present invention, where 1 is a sheet-like reinforcing layer, 2 is a gypsum trihydrate or an inorganic powder and fibrous material mainly composed of gypsum trihydrate. and a small amount of a water-resistant binder, the intermediate layer has flexibility and moisture absorbing and desorbing properties, and 3 represents a heat-sealable hydrophobic thermoplastic resin film layer.

The composite sheet-like building material of the present invention can be manufactured, for example, as follows.

That is, first, an ethylene-vinyl acetate copolymer emulsion is selected as a binder, and trihydrate gypsum and an inorganic fibrous material having an appropriate particle size distribution are gradually added to an aqueous solution of the emulsion at an appropriate concentration while stirring. Prepare stock slurry.

After defoaming or regulating the foam, the slurry is poured onto a sheet-like reinforcing material such as a perforated nonwoven fabric spread on a Teflon-coated carrier sheet and dried at an appropriate temperature for a certain period of time.

After drying, a heat-sealable hydrophobic thermoplastic film is laminated on the surface opposite to the surface on which the nonwoven fabric layer is laminated to obtain the object of the present invention.

The sheet-shaped building material of the present invention can be bonded to, for example, a steel plate of an appropriate thickness using a heat fusion method and then bent.
Moreover, since it can be easily peeled off in parts as necessary, it can be used as roofing or wall materials.

[Brief explanation of the drawing]

FIG. 1 shows an enlarged sectional view in the thickness direction of the composite sheet-like building material of the present invention.

Claims (1)

[Scope of utility model registration request] The middle layer is a flexible and moisture-absorbing layer composed of gypsum trihydrate or an inorganic powder and fibrous material mainly composed of gypsum trihydrate and a small amount of a water-resistant binder. A composite sheet-like building material comprising a sheet-like reinforcing layer made of woven fabric, non-woven fabric, net or paper, and a heat-sealable hydrophobic thermoplastic resin film layer laminated on the other side.