JP2723896B2 - Laminated tarpaulin - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a laminated waterproof sheet used for waterproofing works of general buildings and the like.

[Conventional technology]

In general, waterproofing on a rooftop of a building is performed by applying a liquid composition to the underlayer surface of the rooftop, drying or curing the liquid composition to form a coating film, and obtaining a waterproofing effect by the resulting coating film. It has been practiced to attach a waterproof sheet formed in a factory to a base surface using an adhesive. Further, casting molten asphalt on a substrate has also been performed. The method of waterproofing by forming a coating film on the rooftop surface of the building has the advantage that it can be easily applied to a complicated ground surface, but has the advantage that the ground surface is uneven (the ground surface has irregularities). This has the drawback that if the thickness of the coating film becomes extremely thin due to the above, and a crack occurs in the construction base such as concrete, the coating film breaks from the thin portion and causes water leakage. In addition, the asphalt waterproofing method has a problem in that there is a risk of a fire occurring due to heating and melting, a problem in working such as an odor, and there is a drawback that the concrete substrate is easily damaged if a crack is formed. For this reason, recently, a sheet waterproofing method in which a sheet formed in a factory is adhered to a base surface with an adhesive has been used.

[Problems to be solved by the invention]

In the above sheet waterproofing method, after applying an adhesive to the ground surface on the roof of a building, a band-shaped sheet is laid from one end to the other end of the ground, and the next band-shaped sheet is further laid along the laid band-shaped sheet. The sheet is laid on the entire substrate by repeating the step of laying the sheet. In this case, when laying the belt-like sheet, the belt-like sheet is laid while being pressed from one end to the other end to prevent air from being entrained. However, this does not prevent air entrapment, and the adhesive strength of the air entrapment part is reduced. After about one day has passed after the installation, the entrained air gathers and the gathered parts swell. This causes a problem that the part does not adhere to the base. When such a swollen portion occurs, a small hole is made in the swollen portion to evacuate air, and at the same time, an adhesive is injected and re-adhered, but such work is extremely difficult. It is complicated.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a laminated waterproof sheet that does not swell due to air entrainment and that is not affected by cracks in a substrate.

[Means for solving the problem]

In order to achieve the above object, the laminated waterproof sheet of the present invention is characterized in that a porous sponge layer made of a chemical material having a strong affinity for an undercoat material or an adhesive is directly and on the back surface of the sheet substrate, on the surface to be bonded to the base. It takes a configuration formed integrally.

[Action]

That is, the laminated waterproof sheet of the present invention has a porous material sponge layer having a strong affinity for the undercoat material or the adhesive, so that the undercoat material or the adhesive penetrates the porous material sponge layer during construction. The base and the waterproof sheet can be firmly adhered. In addition, when the present waterproof sheet is extended and bonded, the porous material sponge layer sucks up the undercoat material or adhesive on the lower surface and pushes out the air, so that an air pocket which causes swelling is formed. Does not cause any serious phenomena. Further, when the present waterproof sheet is laid while being pressed from one end of the base to the other end according to the above-described sheet waterproofing method, air entrapment can be prevented. For this reason, a decrease in the adhesive strength at the portion where air is engulfed does not occur, and it is possible to firmly adhere to the base. Therefore, in the conventional sheet, it is necessary to make a small hole in the swollen portion generated after laying, to bleed air, and at the same time to inject an adhesive and bond it, while this waterproof sheet does not need it. Become.

 Next, examples will be described.

〔Example〕

FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 denotes a sheet substrate, which is obtained by impregnating and curing a polyester nonwoven fabric 1a with urethane rubber asphalt. Reference numeral 2 denotes a layer made of a porous urethane sponge, which is integrated with the sheet substrate 1 by utilizing the adhesive force of urethane rubber asphalt. Reference numeral 1c denotes a sand layer, which is made of sand adhered to one surface of the sheet substrate 1 by utilizing the adhesive force of urethane rubber asphalt.
Here, the thickness of the sheet substrate 1 is set to about 0.5 to 10 mm, preferably 1 to 5 mm. Further, the thickness of the porous urethane sponge layer 2 is preferably 0.5 to 4.0 mm or less,
It is preferably about 1 to 2 mm. The expansion ratio of the porous urethane sponge layer 2 is set to 7 to 100 times, and more preferably 20 to 70 times.

As shown in FIG. 2, this laminated waterproof sheet is laid while applying a base adhesive 4 in a layer form on a base 3 such as a roof of a building, and then pressing from one end to the other end.
In this case, the thickness of the coating layer made of the base adhesive 4 is set to be substantially the same as or slightly larger than the thickness of the porous urethane sponge layer 2. In order to firmly adhere the laminated waterproof sheet, the base adhesive is passed through the porous urethane sponge layer 2 and reaches the back surface of the sheet base 1 so that the sheet base 1 is bonded to the base. Therefore, the thickness of the coating layer made of the base adhesive 4 is set as described above.

The base adhesive is not particularly limited as long as it has a strong affinity for the porous urethane sponge layer, but is preferably made of the same or similar material as the porous urethane sponge layer.

For example, when laying the laminated waterproof sheet of the present invention using a solventless two-part curable urethane-based liquid composition as an adhesive, first, after mixing and stirring the two parts, the resulting liquid composition, The application is performed by applying an appropriate means such as a gold trowel or a squeezer to the base surface, and then attaching and laying the waterproof sheet on the application surface before curing. At this time, the thickness of the coating film of the liquid composition is set on the basis of the thickness of the porous urethane layer of the waterproof sheet.
It is set to 0.5 mm or more, more preferably 1.0 mm or more.

The laminated waterproof sheet of the present invention can be manufactured continuously, for example, as shown in FIG. That is,
From the roll 10 around which the polyester non-woven fabric 1a is wound, the above-mentioned non-woven fabric 1a is unwound in a belt shape, the surface thereof is impregnated by flowing down from the tank 11 into the urethane rubber asphalt solution 12, and is passed through the heating tunnel 13 to penetrate to the back surface. At the same time, the sand bed is hardened moderately and then filled with sand
15 while being in contact therewith, sand is adhered to the entire surface (surface) of the urethane rubber asphalt-impregnated polyester nonwoven fabric 1a. Next, the urethane sponge sheet 2 is supplied from the roll 16 around which the urethane sponge sheet 2 is wound to the back surface of the nonwoven fabric 1a, and is bonded and integrated by the adhesive force of the impregnated urethane rubber asphalt. After the urethane sponge sheet 2 is integrated in this manner, the cooling roll 19 is passed in multiple stages, the urethane rubber asphalt is cured, and the urethane sponge sheet 2 and the sheet base 1 are further pressed by the press roll 20. It is manufactured continuously by being integrated and wound up on a winding roll 21.

The laminated waterproof sheet obtained in this manner has the structure shown in FIG. 1 and is firmly adhered to the ground surface by the porous urethane sponge layer 2 on the back surface without involving air, Moreover, it is not affected by cracks in the base.

In place of the polyester nonwoven fabric 1a in FIG. 1, a woven fabric using natural or synthetic fibers such as cotton, hemp, polyester fiber, and nylon fiber may be used. Absent. Further, instead of the sheet base, an ethylene / vinyl acetate copolymer resin,
A synthetic resin sheet made of a polyolefin resin such as an acrylic copolymer resin, a vinylidene chloride / vinyl copolymer resin may be used, and non-vulcanization of a synthetic rubber made of polyurethane, butyl rubber, chloroprene rubber, etc. Alternatively, a vulcanized sheet or the like may be used. By integrally forming a porous sheet having a strong affinity for an undercoat material or an adhesive on the back surface of such a sheet,
The same effect as the laminated waterproof sheet shown in the figure can be obtained. In place of the porous urethane sponge layer in FIG. 1, a sponge sheet of natural or synthetic rubber may be used, or other foamable sheets may be used. In such a case, it is preferable to use an adhesive or undercoating material made of the same or similar material as the porous urethane sponge.

Next, a specific example will be described. First, a laminated waterproof sheet was manufactured as follows.

<Waterproof sheet 1> Polybutadiene rubber (Poly bd R-4 manufactured by Idemitsu Kosan Co., Ltd.)
5HT) 100 parts, straight asphalt (made by Idemitsu Kosan Co., Ltd., A
-80) 100 parts, process oil (Etsuso Chemical Co., Flexon 110) 50 parts, N, N-bis (2-hydroxypropyl) aniline 15 parts, dibutyltin dilaurate 0.02 part, and liquid MDI (Chemical Appizion Co., Isonate143L) ) 33 parts were mixed to make a mixture. This mixed solution is supplied from the tank 11 shown in FIG. 3, and at the same time, a polyester nonwoven fabric is supplied as the sheet substrate 1a, and the laminated waterproof sheet is formed using the urethane sponge sheet 2 having a thickness of 2 mm in the same manner as in FIG. Tsutatsu.

<Waterproof sheet 2> In an autoclave equipped with a stirrer, 140 parts of water, 20 parts of methanol, 12 parts of methylcellulose, 1 part of alkylbenzol sulfonate, 0.5 part of ammonium persulfate and 0.0002 part of colloidal palladium were mixed. The pH value of the mixture was adjusted to about 3 with dilute hydrochloric acid. Then add 60 parts of vinyl acetate and press in 60 parts of ethylene at a temperature of + 10 ° C.
Atmospheric pressure was reached. From that state, hydrogen was further injected at about 1 gauge pressure, and during polymerization, the temperature was increased to about + 10 ° C and the pressure was increased.
It was kept at 40 ± 3 atm. After 20 hours, unreacted ethylene was released to terminate the polymerization. As a result, a dispersion having a solid content of 40% was obtained. This dispersion was aggregated to obtain 90 parts of a rubbery product (VAE- (1)). The product has a vinyl acetate content of 65%, a melt index of 0.1, a Mooney viscosity of 65,
The gel content was 35%.

30 parts of the above VAE- (1) was added to 70 parts of EVA- (1) (vinyl acetate content 15%, melt index 1.5) similarly obtained by the high pressure polymerization method to obtain a composition.

Next, this composition was cut with two rolls at various temperatures to obtain a sheet. And on the back of the obtained sheet,
A urethane rubber sponge sheet having a thickness of 1 mm was adhered using a urethane-based adhesive to obtain a laminated waterproof sheet.

 Next, a base adhesive was attached as follows.

<Adhesive> 100 parts of polybutadiene rubber having an OH equivalent of 0.83 meq / g (manufactured by Idemitsu Petrochemical Co., Ltd., trade name: Poly bd R-45HT), 100 parts straight asphalt (manufactured by Idemitsu Kosan Co., trade name: A-80) 100
Parts, 100 parts of process oil (manufactured by Etsuso Chemical Co., trade name: Flexon 110) and 300 g of agent A consisting of 0.02 parts of dibutyltin dilaurate, and 13 g of agent B made of liquid MDI (manufactured by Kasei Application Corp., trade name: Isonate143L) were added. The mixture was mixed uniformly to obtain a liquid rubber composition, which was used as an adhesive.

Next, using the laminated waterproof sheet and the adhesive obtained as described above, the laminate was applied to the substrate as follows.

[Example 1] An asbestos slate board was prepared, and a 200 g / m ² one-component urethane primer (Kanebo Kasei Co., Ltd., trade name: Belfurt Primer) was applied to the surface of the base and dried for 2 hours. The adhesive obtained by mixing the agent and the agent B was applied with a gold iron to form a coating film. Subsequently, the waterproof sheet 1 was pressure-adhered on the coating film to form a waterproof layer.

Construction Example 2 A waterproof layer was formed in exactly the same manner as in Construction Example 1, except that the waterproof sheet 2 was used instead of the waterproof sheet 1.

[Comparative Example 1] In Construction Example 1, a sand layer was attached instead of the porous urethane sponge layer of the waterproof sheet 1 (the sand tank in FIG. 3).
Sand was adhered to the entire back surface of the sheet at step 17), and a sheet having a sand layer on both sides was used. Otherwise, a waterproof layer was formed in the same manner as in Working Example 1.

[Comparative Example 2] In Working Example 1, a chloroprene solvent-based adhesive (solid content: 20%) was used as the adhesive. Otherwise, construction example 1
A waterproof layer was formed in the same manner as described above.

The swollen state and adhesive strength of the waterproof layers obtained in the above working examples 1 and 2 and comparative examples 1 and 2 are collectively shown in Table 1.

From the results shown in Table 1, in the working examples 1 and 2 according to the present invention, no swelling occurred in the waterproof layer, and the adhesive strength of the waterproof sheet was large and good. However, in Comparative Example 1 using a sheet without a porous urethane sponge layer, a large number of blisters were generated in the waterproof layer, and the adhesive strength of the waterproof sheet was lower than that of Examples 1 and 2, especially in the initial stage (room temperature × 2 days). In, this tendency is large. On the other hand, in Comparative Example 2 using a porous urethane sponge laminated sheet, since air was uniformly involved in the entire waterproof layer, no swelling was observed, but an adhesive with poor affinity was used. Is extremely low and does not rise over time, so that it cannot be used practically.

〔The invention's effect〕

As described above, the laminated waterproof sheet of the present invention has a structure in which the porous sponge layer having a strong affinity for the undercoat material or the adhesive is integrally formed on the back surface of the sheet substrate and the surface to be bonded to the base material. The effect of pushing out air when wearing is great, and the waterproof layer does not swell. Further, since the porous sponge layer is present, an adhesive layer having a uniform thickness can be formed, and a waterproof layer having good adhesiveness can be formed. And, since the porous laminate sheet is more flexible than the double-sided sanded sheet, the workability is good, and the porous body layer is formed by the sheet winding work at the time of production like a single-sided sandless sheet. Since it functions as a release paper, there is an advantage that it is not necessary to wrap the release paper therebetween.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is an explanatory view of the construction state, and FIG. 3 is an explanatory view of the manufacture of FIG. 1 ... sheet base, 1a ... polyester non-woven fabric, 1c ...
Sand layer, porous urethane sponge layer

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-55-158961 (JP, A)

Claims (2)

(57) [Claims] The present invention is characterized in that a porous sponge layer made of a chemical material having a high affinity for an undercoat material or an adhesive is directly and integrally formed on the surface of the back surface of the sheet substrate, which is to be bonded to the base. And laminated waterproof sheet. 2. The laminated waterproof sheet according to claim 1, wherein the porous sponge layer is composed of a urethane porous body.