JPH0820087A - Waterproof heat insulating sheet - Google Patents

Abstract

PURPOSE:To reduce the danger of the generation of a fire caused by the discharge of static electricity at the time of the execution to a building or the like to a large extent because a heat insulating sheet is not charged because a conductive film is laminated to the heat insulating sheet. CONSTITUTION:A conductive film 2 is laminated to at least the single surface of polyolefin resin foam 1 to form a heat insulating sheet and a waterproof sheet 4 is laminated to the surface of the conductive film to obtain a waterproof heat insulating sheet 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved waterproof heat insulating sheet used in a waterproof sheet construction method applied to, for example, a concrete building.

[0002]

2. Description of the Related Art A sheet waterproofing method is a method for waterproofing a building, for example, by attaching a rubber sheet to the roof of a concrete building with an adhesive. In the sheet waterproofing method, a foamed material such as a sheet-shaped or plate-shaped polyolefin resin is used as a heat insulating sheet.

Conventionally, a method of providing a heat insulating sheet as shown in FIG. 3 and laminating a waterproof sheet thereon, and a method of previously laminating a heat insulating sheet and a waterproof sheet as shown in FIG. There are ways to do it.

[0004]

When a solvent-based adhesive is applied to a polyolefin resin foam by this method, a roller brush or a polyethylene cushite is generally used. However, when applying an adhesive using these, static electricity is easily generated, and since the polyolefin resin foam is also easily charged, when the static electricity is discharged, the solvent of the adhesive during work is ignited. There was a risk of fire.

Therefore, on a dry day, it may be necessary to blow away the solvent with a fan or the like to prevent the solvent from staying, or it may be necessary to carry out the charging while flowing the charge to the earth, which makes the work difficult. is there.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a waterproof heat insulating sheet using a heat insulating sheet for preventing generation of static electricity.

[0007]

In order to achieve the above object, in the present invention, a heat insulating sheet having a conductive film laminated on at least one side of a polyolefin resin foam, a waterproof sheet is attached on the conductive film side. There is provided a waterproof heat insulating sheet characterized by the above.

FIG. 1 is an explanatory view for explaining the structure of the waterproof heat insulating sheet 5 of the present invention. 1 is a polyolefin resin foam, 2 is a conductive film, and 4 is a waterproof sheet.

The heat insulating sheet 3 of the waterproof heat insulating sheet 5 according to the present invention includes a polyolefin resin foam 1 and a conductive film 2.
It is composed of a laminated body of. The conductive film is laminated on one side or both sides of the polyolefin foam. The heat insulating sheet having conductive films on both sides of a polyolefin resin foam may be produced by laminating two laminates having conductive films on one side.

As a method for laminating a polyolefin resin foam and a conductive film, a polyolefin resin foam mother plate (hereinafter simply referred to as a mother plate) and a conductive film are adhered and integrated by extrusion lamination or thermal lamination, and then heated and foamed. There are ways. In the case of thermal lamination, when heating the mother board or conductive film,
It is necessary to set the temperature lower than the decomposition temperature of the foaming agent contained in the mother board.

The polyolefin resin foam is obtained by extruding a resin composition obtained by mixing and kneading a base resin with a crosslinking agent and a foaming agent to form a mother board, which is further heated and foamed.

Examples of the base resin include polyethylene, polypropylene, chlorinated polyethylene, ethylene-
At least one selected from the group of polyolefin resins such as propylene copolymer and ethylene-vinyl acetate copolymer, or a mixture of two or more thereof can be used.

As the crosslinking agent, an organic peroxide such as dicumyl peroxide can be preferably used. The amount of the crosslinking agent is usually 100 parts by weight of the polyolefin resin, considering that if the degree of crosslinking is too small, bubbles are likely to burst during foaming, and if the degree of crosslinking is too large, foaming becomes difficult. To 0.5 to 1.2 parts by weight, preferably 0.7 to 1 part by weight.

The foaming agent is not particularly limited, but for example, azodicarbonamide, dinitrosopentamethylenetetramine and the like can be used. The blending amount of these foaming agents is appropriately determined in relation to the foaming ratio of the desired foam, but is usually 11 to 28 parts by weight, preferably 11 to 21 parts by weight with respect to 100 parts by weight of the polyolefin resin. To do.

The resin composition is composed of the above components, but if necessary, known additives such as colorants, antioxidants, ultraviolet absorbers, flame retardants and antistatic agents may be added in appropriate amounts. Not inconvenient.

The conductive film used in the present invention may be such that, when it is laminated with the mother plate by extrusion lamination or thermal lamination and then heated and foamed, it extends to the same extent as the mother plate while being in close contact with the mother plate. From this viewpoint, it is preferably the same material as the mother board and has the same melt viscosity, and polyethylene, polypropylene, chlorinated polyethylene, ethylene-polypropylene copolymer, ethylene-
Examples thereof include polyolefin resins such as vinyl acetate copolymer. The melt index of the base resin is preferably adjusted so that the melt viscosity is the same as that of the mother board.

The conductive film is generally provided with conductivity by adding conductive carbon black, carbon fiber, graphite, a conductive filler such as a surfactant or the like, or an antistatic agent alone or in combination of two or more kinds. The typical one is used.

The surface specific resistance value of the conductive film is preferably 10 ⁸ Ω or less, though it depends on the thickness of the conductive film and the expansion ratio of the polyolefin resin. When the surface specific resistance value is 10 ⁸ Ω or more, it becomes difficult to obtain the antistatic effect during lamination when laminating with the mother board and foaming to form a waterproof heat insulating sheet.

The thickness of the conductive film is not particularly limited,
Although it is appropriately selected depending on the expansion ratio of the polyolefin resin foam, it is preferably 50 to 250 μm. If the thickness is less than 50 μm, the film laminated on the mother board may be stretched and broken during foaming of the mother board. Thickness is 2
If it exceeds 50 μm, the workability during construction tends to be poor.

The expansion ratio of the polyolefin resin foam of the present invention may be any as long as it can be produced.
When used as a heat-insulating waterproof sheet, it is preferably 20 to 40 times that in consideration of physical properties such as thermal conductivity and workability. The reason is that if the expansion ratio is less than 20 times, the thermal conductivity is low and the heat insulating effect is not sufficient, and if the expansion ratio is 40 times or more, the skin peeling strength becomes small and the wind pressure resistance becomes small. This is because

The heat insulating sheet is produced as described above, and the waterproof sheet is laminated on the side of the heat insulating sheet on which the conductive film is provided.

In the present invention, a normal vinyl chloride-based or rubber-based sheet can be preferably used as the waterproof sheet.

[0023]

In the waterproof heat insulating sheet of the present invention, since the heat insulating sheet is formed by laminating the polyolefin resin foam and the conductive film, the chargeability of the heat insulating sheet is reduced and the generation of static electricity is prevented.

[0024]

EXAMPLES The present invention will be specifically described below with reference to examples. A mother plate for a polyethylene resin foam was prepared by mixing 17 parts by weight of azodicarbonamide and 0.8 part by weight of dicumyl peroxide with 100 parts by weight of a high-pressure polyethylene resin and mixing them uniformly, and then using an extruder. Create
150 μm thick on one side of the mother board, surface specific resistance value (AST
A 1.4 × 10 ⁸ Ω conductive film (according to MD257) was heat laminated. This mother plate with a conductive film was placed on a wire mesh conveyor and heated in a heating furnace with hot air at a temperature of 220 ° C. for 5 minutes to continuously foam a length of 50 m. The heat insulating sheet obtained has a density (according to JIS K6767) of 3
5g / l, thickness 8-9mm, surface resistivity is 10 ⁹
It was ~ ¹⁰ .

For comparison, a heat insulating sheet without a conductive film was prepared and the surface resistivity was measured to be 10 ¹⁶
It was -10 ¹⁷ Ω.

A rubber waterproof sheet 4 having a thickness of 1 mm was attached to the obtained heat insulating sheet 3 with a margin from one side edge of the heat insulating sheet as shown in FIG. At this time, no static electricity was generated.

[0027]

EFFECTS OF THE INVENTION The waterproof heat insulating sheet of the present invention does not become charged because the conductive film is laminated on the heat insulating sheet, so there is no risk of fire due to electrostatic discharge during construction on a building or the like. Can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a structure of a waterproof heat insulating sheet of the present invention.

FIG. 2 is a schematic sectional view showing an embodiment of the waterproof heat insulating sheet of the present invention.

FIG. 3 is a cross-sectional perspective view showing a construction example of a waterproof heat insulating sheet.

FIG. 4 is a cross-sectional perspective view showing a construction example of a waterproof heat insulating sheet.

[Explanation of symbols]

 1 Polyolefin resin foam 2 Conductive film 3 Thermal insulation sheet 4 Waterproof sheet 5 Waterproof thermal insulation sheet 6 Concrete base

Claims (1)

[Claims] 1. A waterproof heat insulating sheet comprising a polyolefin resin foam and a conductive film laminated on at least one surface thereof, wherein a waterproof sheet is attached on the conductive film surface.