JPH0637423U - Tarpaulin with ventilation layer - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Waterproof film made by applying a waterproof film to a subbing waterproof sheet mainly composed of non-woven cloth or woven cloth coated with modified asphalt at the perforated portion. To prevent layer swelling. [Composition] An underlayment sheet obtained by laminating a nonwoven fabric 2 having a perforation or a woven fabric with a modified asphalt 3 or a nonwoven fabric obtained by laminating a woven fabric and a plastic film with a modified asphalt layer.

Description

[Detailed description of the device]

[0001]

[Industrial field]

[0002] It relates to a waterproof layer that is breathable by partial adhesion and does not swell.

[Prior art]

Conventionally, in order to prevent swelling by providing air permeability by partially adhering to the waterproof layer, in the urethane coating and polyester coating construction methods, the embossed rubber asphalt sheet and nonwoven fabric are attached to the back surface. It is customary to use a combined underlay sheet, but when a rubber asphalt sheet with an embossed back surface is bonded to the substrate, the convex parts will adhere and the concave parts will be non-adhesive, but it has air permeability. When a long-term load is applied from the surface, the convex portion becomes depressed and the groove of the concave portion is closed, and the air permeability is easily lost, and the function of preventing swelling is lost. Since it contacts with rubber asphalt and undergoes molecular migration, it has the drawback of poor swelling prevention function such as deterioration of modified asphalt.

[Problems to be solved by the device]

The waterproof layer is generally adhered over the entire surface. However, due to the water content, smoothness and processing technique of the base, adhesion failure is likely to occur, and when a void is formed at the interface with the base, the water content of the base is reduced. When the temperature rises from the surface of the waterproof layer, such as solar radiation, it changes to steam that equilibrates to that temperature and exhibits vapor pressure, which pushes up the waterproof layer, causing swelling. The saturated vapor pressure of water with temperature is shown below. Even with a waterproof layer that is applied by a full-scale adhesion method such as a urethane coating waterproof layer, there is a high probability that adhesion defects will occur due to the water content of the substrate, drying, construction errors, etc., so moisture in the substrate concrete will not adhere well. When a pressure near the vapor pressure that evaporates in the space and equilibrates to the temperature is shown, the surroundings are adhered at the interface and a closed state is presented, so the adhesion between the base and the sheet creates a waterproof layer due to the vapor pressure behavior in the void at the interface. If the adhesive surface between the substrate and the sheet is pushed up, and the adhesive surface between the substrate and the sheet is partially bonded, the interface between the substrate and the sheet shows a semi-closed state because the non-adhesive part has air permeability, so it is unsaturated even if water evaporates. The vapor pressure diffuses to the non-adhesive part to reach the vapor pressure, and the vapor pressure becomes a very small value.Therefore, there is no pressure to push up the waterproof layer, so it can be determined from the appearance that there is swelling. I can not do it, but Breathable adhesive portion is to be held in the long-term air permeability is temporary blistering prevention function rubber asphalt sheet having been subjected to embossing is a conventional part adhesive is thin expected disadvantages. When a waterproof layer is formed on the upper surface of the subbing sheet with a reactive resin as in the urethane coating method, if the upper layer of the subbing sheet is only the nonwoven fabric, the urethane resin is a fluid at the time of application, so it penetrates into the nonwoven fabric and is improved. There is a drawback that the asphalt deteriorates due to the molecular migration that occurs when it comes into contact with high quality asphalt. An underlay waterproof sheet that compensates for the above-mentioned drawbacks and secures air permeability for a long period of time by non-adhesive parts by partial adhesion, and maintains the adhesiveness of the modified asphalt so that it does not turn up even in partial adhesion with the base under strong wind. Is to develop.

[Means for Solving the Problems]

The urethane resin waterproof layer ensures the air permeability of the non-adhesive part of the partial adhesion method that prevents swelling for a long period of time, and the modified asphalt of the subbing sheet comes into contact with the waterproofing material of the upper layer. We considered the performance required for the underlaying sheet that maintains the function to prevent the following from occurring as follows.

[Action]

(1). To fill the perforated part of a non-woven fabric or woven fabric with a perforated area of about 20% or more with the modified asphalt, and to keep the adhesive strength of about 0.2 kg / cm ^{2 at} 20 ° C on the base, the modified asphalt is used. since the adhesive strength at 20% bonding area and to use a vertical peeling strength 1.0 kg / cm ² of concrete surface is 0.2 kg / cm ² was obtained coercive bract calculated value, urethane coating It was estimated that the waterproof layer ends would not be flipped up by strong winds after the construction because it was sufficiently adhered to the base (2). In order to maintain the air permeability of the non-bonded part by the partial bonding method for a long period of time, use a nonwoven fabric of polyester fiber layer that does not sag under the load from the surface of the waterproof layer. The urethane resin adheres strongly to the non-woven fabric used for the surface layer, but prevents it from coming into contact with the modified asphalt of the subbing sheet so that it will not be penetrated by the low molecular weight compounds contained in the urethane resin of the material. Then, a non-woven fabric laminated with a plastic film and a non-woven fabric whose surface is treated with modified asphalt so as to fill the perforated part are laminated to form a subbing waterproof sheet. A laminated waterproof layer using a subbing waterproof sheet having the above performance will be described with reference to examples.

【Example】

FIG. 1 of the attached sheet shows that the holes of the perforated portion are the non-woven fabric 2 having a perforation area of 20% and having a basis weight of 100 g / m ² and a thickness of 0.8 mm, which are arranged at intervals of 20 mm, and the modified asphalt 3 is perforated. FIG. 3 is a plan view of the sheet 4 having a structure in which a part is filled and a surface is coated with a thickness of 1 mm, the perforated part is adhered, and the other non-adhered part is a ventilation layer. FIG. 2 shows a construction in which a sheet 5 made of a nonwoven fabric 7 obtained by laminating a polyester film 6 on a sheet 4 is attached to a base 11 coated with a primer 10 and partially bonded with a modified asphalt 3 filled in perforations. FIG. 3 is a cross-sectional view of a laminated waterproof layer 9 obtained by applying a urethane resin to the surface of the subbing sheet 1 that has been applied, permeating the nonwoven fabric 7 and reinforcing the fiber with a urethane coating film layer 8 bonded together. The construction is carried out by applying the primer 10 on the underlayer 11 and partially adhering the underlaying waterproof sheet 1 by pressure bonding, and applying urethane resin on the surface thereof to form the urethane coating film layer 8 containing fibers that has penetrated into the nonwoven fabric 7. The laminated waterproof layer 9 is applied. As a waterproof material forming the upper layer of the underlay waterproof sheet, a polyester waterproof resin may be laminated on the urethane resin to form a laminated waterproof layer.

[Effect of device]

A waterproof layer that is directly adhered to a substrate, such as a waterproof film formed of a urethane resin, is likely to swell. Therefore, partial adhesion can prevent swelling temporarily, but in the present proposal, the surface is prevented. Has the effect of forming a ventilation layer that prevents the swelling of the waterproof layer over a long period of time, so that the breathable fiber layer can withstand the load from .

[Brief description of drawings]

FIG. 1 is a plan view of the back surface of a waterproof sheet used for underlayment.

FIG. 2 is a cross-sectional view of a laminated waterproof layer formed by laminating a urethane coating waterproof layer on the upper surface of a subbing sheet.

[Explanation of symbols] 1: Underlay waterproof sheet). 2: Non-woven fabric with perforations 3: Modified asphalt 4: Non-woven fabric with perforated parts filled with perforated parts with modified asphalt and coated on the surface 5: Polyester that prevents deterioration of the modified asphalt by applying urethane resin Non-woven fabric laminated with film. 6: Polyester film 7: Nonwoven fabric 8: Urethane coating layer 9: Laminated waterproof layer 10: Primer 11: Base

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshikazu Uchida 1-29-18 Adachi, Adachi-ku, Tokyo (72) Inventor Takeo Inaba 729-4 Karasuyama-cho, Kohoku-ku, Yokohama-shi, Kanagawa Japan Constec Co., Ltd.

Claims (1)

[Claims for utility model registration] A sheet of non-woven fabric or woven fabric having a perforation area of 15 to 40%, the surface of which is treated with modified asphalt so that the perforations are filled, and a waterproof layer for forming an upper waterproof layer. An underlay tarpaulin with a fiber ventilation layer that has a structure in which a non-woven fabric or a woven fabric laminated with a plastic film is laminated so as to prevent the material from penetrating through the fiber layer and coming into contact with the modified asphalt to deteriorate. 1.