JPH0834085A - Heat insulating material - Google Patents

Abstract

PURPOSE:To provide a heat insulating material high in the bonding strength to the surface of a concrete floor, suppressed in thermal expansion and contraction, prevented from the peeling or shift from the surface of the concrete floor and excellent in execution properties. CONSTITUTION:A heat insulating material 1 is obtained by providing a two-pack type curable primer layer on the single surface of a crosslinked foamed polyethylene sheet 11 (foaming magnification; 30 times, thickness; 25mm).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material used together with a waterproof structure for a concrete floor surface on a roof of a building or the like.

[0002]

2. Description of the Related Art On a rooftop of a building, a heat insulating layer is provided on a concrete floor, and a sheet waterproof, a coating waterproof, an asphalt waterproof, etc. are provided thereon. As a heat insulation layer, apply a rubber adhesive on the site to a sheet-like polyethylene foam or polystyrene foam, and dry it, and also apply a similar adhesive to the concrete floor surface and dry it, and then add the above foam to concrete. The one adhered to the floor is often used.

[0003]

In the heat insulating layer as described above, since the heat insulating material expands and contracts more greatly than the floor concrete due to heat, the adhesive portion may peel off due to repeated cold and heat, and the heat insulating material may float. . In particular, when a rubber sheet is used as the waterproof layer, as shown in FIG. 2, for example, the heat insulating material 6 shrinks at a low temperature, so that the shrinking portion 60 of the heat insulating material 6 separates from the adhesive 3 and rises to the wall surface. (Parapet) 20
Therefore, the rubber sheet 4 may be broken. Such a problem is caused by the heat insulating material 6 of the adhesive 3 applied to the concrete floor surface 2.
This is due to the weak adhesion to the.

When the waterproof layer is of a black type that easily absorbs heat, the temperature of the waterproof layer and the heat insulating material becomes high, the adhesive softens and the adhesive strength is lowered, and the heat insulating material and the concrete floor surface are separated from each other. It may shift or peel off.

Further, when the adhesive is applied to the heat insulating material in the field, a space for the application work is required, and work for temporarily fixing it so as not to be blown by the wind and drying time are also required. In addition, when applied on site, the application and drying tend to be uneven.

The present invention solves the above-mentioned conventional problems and has a large adhesive force to the concrete floor surface, whereby the expansion and contraction of the heat insulating material due to heat is suppressed, and the heat insulation material is not peeled or displaced from the concrete floor surface. The purpose is to provide a heat insulating material with excellent workability.

[0007]

The heat insulating material of the present invention is characterized in that a crosslinkable polyethylene sheet is provided with a curable primer layer on at least one surface thereof.

In the present invention, the curable primer may be a polyester-based, epoxy-based or urethane-based adhesive, and may be used as a one-part, two-part emulsion or an emulsion, but it does not soften due to high temperatures in summer. You should choose one.

When the curable primer layer is applied and cured on at least one surface of a crosslinked foamed polyethylene sheet which is a heat insulating material in advance, it is laminated on the foamed polyethylene sheet with a strong adhesive force due to anchoring property. However, the surface after curing is non-adhesive. In order to apply the curable primer to the crosslinked foamed polyethylene sheet, a coater such as a gravure roll or a reverse roll may be used to apply the curable primer by an ordinary coating technique.

[0010]

[Function] The curable primer layer exhibits anchoring property to the foamed polyethylene sheet and is strongly bonded. As a result, the polyethylene sheet is adhered to the concrete floor surface with an excellent adhesive force by the adhesive applied to the concrete floor surface, the expansion and contraction of the heat insulating material is suppressed even if the temperature is repeated, and it does not peel off or slip from the concrete floor surface. . In addition, since it is non-adhesive after being hardened on the polyethylene sheet surface, handling is easy and workability is excellent.

[0011]

Embodiments of the heat insulating material of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the heat insulating material of the present invention. The heat insulating material 1 is a cross-linked expanded polyethylene sheet 11
The two-component curing type primer layer 12 is provided on one surface (foaming ratio 30 times, thickness 25 mm). The curable primer layer 12 is formed as follows.

As the main agent, viscosity 700 cps, solid content 3
Toluene solution containing 0% of polyester resin as main component (Sekisui Chemical Co., Ltd., trade name: Esdyne 580G)
And an isocyanate-based curing agent (solid content 20%, manufactured by Sekisui Chemical Co., Ltd., trade name: Esdyne UX-RE) at a weight ratio of 15: 0.75 were used as an adhesive using a gravure roll (60 mesh). 10 to 50 g / m ^{2 on} one side of the cross-linked foamed polyethylene sheet 1 at 60 ° C.
It was dried for 30 seconds.

Dust and dust on the surface of the concrete slab 2 are removed, and the same adhesive 3 as described above is applied to the surface of the concrete slab 50 using an application roller.
After coating at 0 g / m ² and drying at room temperature for 1 hour, the curable primer layer 1 of the crosslinked foamed polyethylene sheet 11
2 were stuck together and pressed by a pressing roller to be pressure bonded.

On the upper surface of the heat insulating material 1 attached to the concrete slab 2, 100 g of the same adhesive 5 as described above is applied.
/ M ² , and dried for 1 hour. Then, the rubber sheet 4 was attached and pressure-bonded with a pressing roller.

In order to evaluate the performance of the heat insulating material 1 of the above-mentioned example, this heat insulating material was adhered to a slate plate by the same method as in the example and allowed to stand at 80 ° C for 72 hours and then at -30 ° C for 24 hours. After repeating this heating and cooling 10 times,
When a 180 ° peel test was performed at ℃, the heat insulating material could not be peeled from the slate plate, and the polyethylene foam was broken.

(Comparative Example) A rubber-based adhesive (viscosity 400 cps, solid content 30%, manufactured by Sekisui Chemical Co., Ltd.) prepared by dissolving SBS in the same cross-linked foamed polyethylene sheet as that used in the Examples in toluene. , Product name: Esdyne 2
A heat-insulating material obtained by coating and drying 80) at a coating amount (thickness) of 30 g / m ² was subjected to a peeling test in the same manner as in the examples. This product was easily peeled off from the interface between the slate plate and the heat insulating material by hand.

[0017]

Since the heat insulating material of the present invention has the above constitution,
It has a large adhesive force to the concrete floor surface, which suppresses expansion and contraction of the heat insulating material due to heat, and does not peel off or shift from the concrete floor surface. Further, since the cured primer layer is non-adhesive, it is easy to handle and has excellent workability.

[0018]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a heat insulating material of the present invention.

FIG. 2 is a sectional view showing a conventional heat insulating material in use.

[Explanation of symbols]

 1: Heat insulating material 2: Concrete slab 3, 5: Adhesive 4: Rubber sheet 11: Cross-linked expanded polyethylene sheet 12: Primer layer

Claims (1)

[Claims] 1. A heat insulating material comprising a crosslinked foamed polyethylene sheet and a curable primer layer provided on at least one surface thereof.