JPH0376664B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a waterproof sheet for preventing swelling that can be used for sheet waterproofing construction on the roofs of buildings, etc. [Prior Art] Typical conventional methods for preventing swelling are the degassing method and the heavy weight pressing method. However, with the above-mentioned deaeration method, since the waterproof layer is applied in a floating manner, if even one part of the waterproof layer is damaged, water will spread all over the entire surface, and because there is a lap part in the ventilation layer, the waterproof layer is likely to become uneven, and the adhesion between the base and the sheet will be impaired. Because it is weak, the waterproof layer is easily peeled off by negative pressure such as in a typhoon, so it is necessary to install the breathable layer and the waterproof layer twice. Further, in the heavy object pressing method, weight is applied to the substrate, and if a variable load is applied to the heavy object, the sheet may tear, making the construction work complicated and expensive. [Problems to be solved by the invention] In order to improve the deterioration of the swell prevention and waterproof performance in this swell prevention construction method, countermeasures such as coating the base surface with a hard resin layer and then providing a waterproof layer have been proposed. However, the construction work will be complicated. Therefore, it is an object of the present invention to provide a waterproof sheet which is easy to construct and which provides both swelling prevention and waterproof performance. [Means for Solving the Problems] For this reason, the inventors of the present invention conducted extensive research and found the following. In other words, when pasting a self-adhesive sheet onto a base surface such as concrete, providing a ventilation layer on the self-adhesion surface of the sheet allows water vapor generated from the base to escape through this ventilation layer, allowing the sheet to It was found that swelling was less likely to occur. As a result of further research, we found that when a mesh sheet with a specific shape is attached to a self-adhesive sheet,
It has been found that the adhesive force between the base surface and the self-adhesive sheet is strong and the anti-swelling performance is maintained for a long period of time. The present invention was made based on the above knowledge, and includes a base fabric laminated on one side of a self-adhesive rubber asphalt composition layer, and a filament, twisted yarn, flat yarn, etc. on the other side of the rubber asphalt composition layer. The present invention provides a waterproof sheet for preventing swelling, which is made by pasting together mesh sheets having a thickness of 50 to 2000 deniers and a mesh interval of 0.5 to 30 cm. The self-adhesive rubber-asphalt composition layer in the present invention refers to a sheet-like material that is mainly composed of rubber and asphalt and has self-adhesive properties. The above-mentioned self-adhesive rubber asphalt composition layer must have an adhesion force (180 degree peel) to the primer-coated mortar surface of 2 kg/2.5 cm or more at room temperature (approximately 25°C) as determined according to ASTM D903. preferable. As such a rubber asphalt composition layer, for example, 100 parts by weight of asphalt is mixed with 2 to 2 parts of rubber.
100 parts by weight, 0 to 15 parts by weight of thermoplastic resin, and 0 to 70 parts by weight of inorganic filler are added and mixed, and 0 to 0.25 parts by weight of sulfur is further blended to form a 120 to 200 part by weight mixture.
A rubber asphalt composition obtained by heating and mixing at a temperature of 1 to 10 hours is laminated on one side of a base fabric to form a layer. The thickness of the rubber asphalt composition layer is determined from the viewpoint of performance and ease of joining.
0.4 to 4 mm is preferred. Examples of the base fabric in the present invention include woven fabric, nonwoven fabric, felt, or paper made of organic fibers, and fabrics impregnated with asphalt.
For example, as the base fabric, a woven fabric or nonwoven fabric made of fibers such as polyolefin, polyamide, polyester, polyvinyl alcohol, or wool, felt or kraft paper, or a material obtained by impregnating these with asphalt can be used. In particular, as the base fabric, a nonwoven fabric made of continuous polyester fibers impregnated with asphalt is preferable from the viewpoint of maintaining resistance to cracking of the base, long-term waterproof performance, and anti-swelling performance. The thickness of the base fabric is preferably 0.1 to 3 mm from the viewpoint of ease of joining and performance. In the present invention, a mesh sheet is laminated to the self-adhesive layer surface of the rubber asphalt composition on which the base fabric is not laminated, and this mesh portion is used as a ventilation layer to transport water vapor generated from the base to a degassing tower or the edge of the sheet (usually with metal fittings). It can be guided to the outside from the presser foot. The mesh sheet is made of filament, twisted yarn, or flat yarn of polyester, nylon, polyethylene, polypropylene, polyurethane, vinylon, hemp, cotton, wool, etc., and blends thereof, and has a thickness of 50 to 2000 deniers, preferably.
150-1000 denier, mesh spacing 0.5-30cm,
Preferably, the length is 1 to 20 cm. If the thickness of the mesh filament, etc. is smaller than 50 denier, it will not function as a ventilation layer, and if it is larger than 2000 denier, bulges will appear between the rubber asphalt adhesive layer and the underlying surface, reducing adhesiveness. Moreover, if the mesh spacing is smaller than 0.5 cm, it will become almost floating and the adhesion to the base will be poor, and if the mesh spacing is larger than 30 cm, swelling will occur, which is not preferable. The waterproof sheet of the present invention can be obtained, for example, by first laminating a heated rubber asphalt composition and a base fabric, and then laminating a mesh sheet to the surface of the rubber asphalt composition on which the base fabric is not laminated. be able to. The thickness of the waterproof sheet is preferably 0.8 to 5 mm. The waterproof sheet of the present invention can be waterproofed by applying a primer to a mortar (or concrete) base surface such as the roof of a building and then pasting the sheet. Examples of the present invention are shown below. Example 1 A rubber asphalt composition exhibiting self-adhesive properties at room temperature [adhesion strength at 25°C in a 180 degree peel test with a primer-coated mortar surface measured according to ASTM D903 is 8 kg/2.5 cm] was applied to asphalt. A rubber asphalt composition layer was laminated to a thickness of 1.2 mm on an impregnated polyester continuous filament nonwoven fabric [nonwoven fabric weight: 140 g/m ² , thickness: 0.8 mm], and then other rubber asphalt composition layers were laminated to a thickness of 1.2 mm. A waterproof sheet in which a mesh sheet made of polyester monofilament with a thickness (filament diameter) of 200 deniers and a mesh interval of 1 cm is attached to the surface, and the mesh sheet is about half buried in the rubber asphalt composition. 15m x 1m x 2mm) was obtained. Using this tarpaulin sheet with a mesh sheet, waterproofing to prevent swelling was carried out as follows. Apply asphalt primer (JASS-8 standard product) to the concrete base surface with a moisture content of approximately 15% by weight, which has been finished with a metal trowel for 3 days, at a concentration of 300g per ^1m2 , and after drying (leaving it for a while), The sheet was attached on top using a self-adhesive rubber asphalt composition. The sheets were observed for one year after installation, and the swell prevention performance was evaluated based on the presence or absence of swell, and the waterproof performance was evaluated based on the surface condition of the tarpaulin sheet. The results are summarized in Table 1. Example 2 A waterproof sheet (15 m x 1 m x 2 mm) was obtained in the same manner as in Example 1, except that a mesh sheet made of polyester monofilament with a thickness of 1000 denier and a mesh interval of 5 cm was used. Ta. Table 1 shows the results of anti-blister waterproofing using this waterproof sheet. Example 3 A tarpaulin sheet (15
m x 1 m x 2 mm) was obtained. Table 1 shows the results of anti-blister waterproofing using this waterproof sheet. Comparative Example 1 A waterproofing sheet (thickness: 2.0 mm) in which the self-adhesive rubber asphalt composition of Example 1 was simply laminated onto an asphalt-impregnated nonwoven fabric was used to perform waterproofing on a primer-coated concrete subsurface in the same manner. The results are summarized in Table 1. Comparative Example 2 A rubber sheet (JISA-6008 passed product) (thickness 1.2 mm) was attached to a primer-coated concrete base surface using an adhesive (chloroprene-based) for waterproofing. The results are summarized in Table 1.

〔Effect of the invention〕

As explained above, the waterproof sheet of the present invention can be easily applied, and when applied to a subsurface such as a concrete base, it does not swell and maintains excellent waterproof performance for a long period of time. is obtained.

Claims (1)

[Scope of Claims] 1. A base fabric is laminated on one side of the self-adhesive rubber asphalt composition layer, and the other side of the rubber asphalt composition layer is laminated with a filament, twisted yarn, flat yarn, etc. whose thickness is A waterproof sheet to prevent swelling, made by pasting together mesh sheets of 50 to 2000 deniers with mesh spacing of 0.5 to 30 cm. 2. The waterproof sheet according to claim 1, wherein the base fabric is a nonwoven fabric impregnated with asphalt.