JPH047200Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a waterproof sheet for use with water-based adhesives, particularly to a synthetic polymer roofing sheet that prevents the use of water-based adhesives.

[Conventional technology]

Conventionally, in waterproofing work for synthetic polymer roofing, organic solvent-based adhesives are usually used to adhere to the substrate, but the use of such organic solvent-based adhesives poses a risk of fire or poisoning. Due to safety and health issues, the use of solvent-free adhesives is required. By the way, this kind of solvent-free adhesive can be roughly divided into reactive type and water-based type, and both can be used, but the former has the problem of poor initial adhesion, so the latter is currently used. is becoming common.

[Problems that the invention attempts to solve]

However, since such water-based adhesives are water-based, they do not dry well when the base is wet or humid, which often causes problems in the work. In addition, when a water-based material is used, the base contains moisture, and as the surface temperature of the tarpaulin sheet rises, the vapor pressure of the base water increases, which causes the waterproof layer to swell and reduces the adhesive strength of the tarpaulin sheet. . The present invention addresses the above-mentioned facts and aims to improve the initial adhesion strength by absorbing the moisture of the adhesive and the moisture of the base when using the above-mentioned water-based adhesive, and to solve the above-mentioned drawbacks. It is.

[Means to solve the problem]

Therefore, the feature of the present invention that solves the above problems is that it focuses on the use of super absorbent polymers and impregnates or blends super absorbent polymers into the lower layer of conventional synthetic polymer roofing sheets. The point is that the layered bodies are laminated. Here, super absorbent polymers include polyacrylic acid,
polyacrylamide, polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone,
Polystyrene sulfonic acid, poly-2-acrylamido-2-methylpropanesulfonic acid, carboxyl polymer

[Maleic anhydride-olefin copolymer, acrylic acid-acrylic acid ester copolymer, etc.] Or water-soluble polymers such as saponified copolymers of ethylene, vinyl ester, and ethylenically unsaturated carboxylic acid or its derivatives. (a) Self-crosslinked (b) A small amount of divinyl compound

[Ethylene glycol diacrylate, divinylbenzene, NN′-
Copolymerized with methylene bisacrylamide, N-methylol acrylamide, etc. (c) Radiation crosslinked (d) Epoxy compounds, metal compounds

[Polyvalent metal ion, Ca(OH) _2, etc.], poly-N-methylol acrylamide, urea-formamide resin, bisoxazoline compound, epichlorohydrin-1.3
-dichloroisopropanol, dialdehyde

[Glyoxal, glutaraldehyde], bishalogen

[Dichlorohydrin] refers to those chemically post-crosslinked with isocyanates, etc. On the other hand, the layered material impregnated with or blended with the above-mentioned superabsorbent polymer means a woven fabric, non-woven fabric, fiber layer, or compound layer blended with a superabsorbent polymer. This is a preferred layered body. This nonwoven fabric preferably has a thickness of about 0.15 to 1.2 mm, and is made of polyester, polyamide, polyolefin, polyvinyl alcohol, aromatic polyamide,
It is made of glass fiber, can be obtained by known means, and has good moisture absorption performance. Then, as a method of adhering and impregnating the layered body with the superabsorbent polymer, the superabsorbent polymer is dispersed in an organic solvent, and the nonwoven fabric or the like is adhered and impregnated with the superabsorbent polymer. At this time, the preferable amount of the above polymer attached is
It is 0.1-20g/ ^m2 . Examples of synthetic polymer roofing sheets used in the present invention include vulcanized rubber sheets, non-vulcanized rubber sheets, polyvinyl chloride resins, polyethylene resins, and rubberized asphalt sheets, and the thickness thereof is usually as follows: It is about 0.5 to 3.0 mm. 0.5
If it is less than 3.0 mm, the impact resistance will be poor, while if it is 3.0 mm or more, the difference in level between the joints of the sheets will become large. Thus, by laminating the fabric, non-woven fabric, fiber or blended layered material containing a super absorbent polymer impregnated with a super absorbent polymer as described above on the lower layer of a polymer roofing sheet, super absorbent material can be obtained. The action of the polymer allows it to absorb moisture and improve the initial adhesion strength, making it effective for areas that are subject to stress such as walls, and at the same time being effective in preventing the waterproof layer from blistering as it is immune to the effects of underlying moisture. Demonstrate. Therefore, this eliminates the conventional concept that water-based adhesives cannot be applied to outdoor exposed construction work, and
make the application possible.

【Example】

Embodiments of the present invention will be further described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an example of a water-based adhesive waterproof sheet according to the present invention. In the figure, 1 indicates the entire waterproof sheet, and a nonwoven fabric 3 is laminated in contact with a synthetic polymer roofing sheet 2. This nonwoven fabric 3
is impregnated with the above-mentioned super absorbent polymer 4 to form a waterproof sheet. Such a waterproof sheet 1, as shown in FIG.
It is applied by laying it on a base 5 impregnated with a relatively high amount of water such as concrete or mortar, but in this case, a water-based adhesive made of a modified emulsion such as a rubber asphalt emulsion or an acrylic ester copolymer is applied to the surface of the base 5. Agent 6 is applied. Therefore, the nonwoven fabric 3 of the waterproof sheet 1 actively absorbs the water-based adhesive 6, and the superabsorbent polymer 4 impregnated in the nonwoven fabric 3 absorbs the moisture of the water-based adhesive for a short period of time. A waterproof layer 7 having a strong water-blocking film is formed by retaining the water absorbed by the water. In this way, the water absorption and curing reaction of the superabsorbent polymer makes it possible to bond the waterproof sheet to the substrate in a short period of time, and even in high-temperature environments, the water impregnated in the substrate does not evaporate. However, the superabsorbent polymer immediately reacts with water vapor, so the waterproof sheet does not blister. Next, specific examples of application of the water-based adhesive waterproof sheet of the present invention will be described. Asbestos straight plate is used as a base, and rubber asphalt emulsion is applied to the base.

[PH10.5, solid content 60
%] and impregnated a highly water-absorbing polymer of polyacrylamide-acrylic acid copolymer (trade name, Aqua Keep 4S, manufactured by Seitetsu Kagaku Kogyo Co., Ltd.) into a nonwoven fabric made of polyester long fibers of various basis weights. It was attached to an EPT vulcanized rubber sheet, and a waterproof sheet was laid so that the nonwoven fabric faced the base. In order to investigate the reaction results between the water-based adhesive and the superabsorbent polymer, a peel test was conducted between the base and the waterproof sheet. The peel test was conducted using a tensile tester at a peel rate of 200 mm/mm. The results were as shown in the table below. Date amount Polymer adhesion amount Time

[hr]

[g/m ² ] 1 2 3 0 0.4 1.3 20 0.4 1.0 1.9 Destruction of nonwoven fabric g/m ² 5.0 1.6 2.3 0 0.8 1.0 3.0 50 0.4 1.1 2.3 3.0 g/m ² 5.0 2.2 3.5 4.0

[Effect of the idea]

As mentioned above, since the waterproof sheet for water-based adhesives of the present invention is used for water-based adhesives, it has inherent risks such as fire and poisoning compared to cases where conventional organic solvent-based adhesives are used. Moreover, it increases the adhesive strength with the substrate in a shorter time than the table above, and has an excellent effect of preventing the occurrence of blistering of the waterproof sheet due to the vaporization of the water impregnated in the substrate. ing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a waterproof sheet according to the present invention, and FIG. 2 is a cross-sectional view showing a state in which the waterproof sheet is installed. 1... Waterproof sheet, 2... Synthetic polymer roofing sheet, 3... Nonwoven fabric

[Layered body], 4...Super absorbent polymer.

Claims (1)

[Scope of utility model registration request] A water-based waterproof sheet that is adhered to a substrate via a water-based adhesive, characterized in that it is formed by laminating a layered body impregnated with or blended with a highly water-absorbing polymer on the lower layer of a synthetic polymer roofing sheet. Tarpaulin for adhesives.