JPH07316513A - Waterproof laminate - Google Patents

Abstract

PURPOSE:To obtain a waterproof laminate, having an undercoat layer formed by coating one surface of a resin sheet with a specific primer and drying the primer and capable of reducing the amount of an organic solvent used and firmly bonding the resultant sheet to a substrate and useful in waterproof works of buildings. CONSTITUTION:This laminate has an undercoating layer formed by coating one surface of (A) a resin sheet with (B) a primer containing (i) a tackifier and (ii) a polychloroprene latex and drying the primer. Furthermore, the sheet (A) preferably consists essentially of an ethylene-propylene-diene terpolymer and the component (i) is preferably rosin or its derivative. The component (B) preferably contains (iii) a heat-sensitive agent which is polyvinyl methyl ether, polypropylene glycol, a modified silicone or an ammonium salt and the component (ii) and the thickness of the primer layer is preferably 10-50mum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof sheet laminate. More specifically, it relates to a waterproof sheet laminate that can be suitably used when waterproofing a building or the like made of a cementitious base material.

[0002]

2. Description of the Related Art There are asphalt waterproofing method, mortar waterproofing method, sheet waterproofing method, coating film waterproofing method and the like as waterproofing methods for cementitious base materials such as concrete structures.
Among these, the sheet waterproofing method is a method that has become extremely popular in recent years due to its simple construction.

In the sheet waterproofing method, an adhesive or a metal fitting is used when joining the waterproof sheet to the cementitious base material, but the adhesive is often used because of its excellent waterproof performance. .

Conventionally, solvent-based polychloroprene adhesives have been mainly used as the adhesives. Usually, the polychloroprene adhesives are directly applied to both the waterproof sheet and the cementitious base material at the construction site. By this, it has been used.

However, since an organic solvent is used for the polychloroprene adhesive, the organic solvent is volatilized during construction, which is not preferable in terms of safety and hygiene for human body and environmental protection. Therefore, when attaching the waterproof sheet to the substrate, it is desirable to reduce the amount of the organic solvent used as much as possible.

As an adhesive agent which does not use an organic solvent, an adhesive agent for a water-based waterproof sheet in which a tackifying resin is mixed with a rubber latex has been proposed (Japanese Patent Laid-Open No. 57-200468).
Issue).

However, when the above-mentioned waterproof sheet adhesive is used, the waterproof sheet and the base material cannot be firmly bonded to each other, and peeling easily occurs, which is a problem in terms of adhesive strength.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned prior art. As in the case of using a conventional organic solvent-based adhesive, the organic solvent is applied to both the waterproof sheet and the base material. There is no need to apply a system adhesive, the amount of organic solvent used can be reduced, and it is stronger on the base material than when a conventional waterproof sheet is bonded using a water-based waterproof sheet adhesive. It is an object of the present invention to provide a waterproof sheet laminate which can be adhered to.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides a waterproof sheet laminate having an undercoat layer formed by applying an undercoat agent containing a tackifier and a polychloroprene latex on one surface of a resin sheet and drying the undercoat layer. Body (hereinafter referred to as the first invention), and a waterproof sheet laminate having an undercoat layer formed by applying a primer coating containing a heat-sensitizing agent and polychloroprene latex on one surface of a resin sheet and drying the coating (hereinafter , Second invention).

[0010]

OPERATIONS AND EXAMPLES As described above, the waterproof sheet laminates of the first and second inventions are formed by applying a primer having a specific composition on one surface of a resin sheet and drying the resin sheet. It is a laminate having an undercoat layer.

Since the waterproof sheet laminates of the first and second inventions are provided with an undercoat layer having a specific composition, the resin sheet is directly applied to a base material such as a cementitious base material to form an aqueous base material. The problem that the resin sheet is easily peeled off from the base material as in the case where the resin sheet is adhered using the adhesive agent for a waterproof sheet is solved. Furthermore, since the undercoat layer is excellent not only in adhesiveness to the resin sheet and the base material but also in water resistance, the waterproof sheet laminate of the first invention and the second invention is Can be widely and suitably used not only indoors but also outdoors.

The resin sheet used in the first and second inventions is, for example, an unvulcanized sheet or vulcanized sheet made of ethylene-propylene-diene terpolymer, butyl rubber, a mixture thereof, polychloroprene sheet, chlorosulfone. Polyethylene sheet, ethylene-
Examples include vinyl acetate resin sheets and vinyl chloride resin sheets, sheets obtained by laminating these sheets with other sheets, and asphalt-impregnated sheets obtained by impregnating a base fabric made of a resin component constituting the sheet with asphalt. Among these, ethylene-propylene-
A sheet containing a diene terpolymer as a main component, a sheet containing butyl rubber as a main component, and among them, a sheet made of an ethylene-propylene-diene terpolymer is excellent in mechanical strength such as durability and tensile strength. preferable. Here, the main component means that the content of the component in the resin and rubber components is 50% by weight or more.

The thickness of the resin sheet is not particularly limited and may be appropriately selected depending on the purpose, application and the like. If the thickness of the resin sheet is too large, handling becomes inconvenient. Therefore, considering the use as a waterproof sheet, it is preferably 3 mm or less, and particularly 2 mm or less. If the thickness of the resin sheet is too small, it tends to be damaged during handling or use, so 0.5 mm or more,
It is preferable that it is 1 mm or more.

The primer used in the first invention contains a tackifier and a polychloroprene latex, and the primer used in the second invention contains a heat-sensitizer and a polychloroprene latex. Is.

As described above, the undercoating agent used in the present invention contains polychloroprene latex, so that the waterproof sheet laminate of the present invention has a high adhesive strength with respect to the underlayer and is about -30 to 90 ° C. Although it has viscoelasticity that allows the difference in the coefficient of thermal expansion from the base material in the operating temperature range, it does not have fluidity, and it is initially necessary for the workability (re-sticking, fine adjustment of sticking, etc.). It has several excellent properties, such as that the tack is not too large.

The polychloroprene latex means 2
-Polychloroprene latex which is a polymer of chloro-1,3-butadiene, latex of a copolymer of 2-chloro-1,3-butadiene and 2,3-dichloro-1,3-butadiene, or a mixture thereof. .

If the resin solids content of the polychloroprene latex is too high, it tends to be unstable to mechanical stimuli, so 70% by weight or less, especially 60% by weight or less. If it is too small, it tends to require a large amount of energy to evaporate water when it is dried, so it is more than 35% by weight, especially 40% by weight.
The above is preferable.

When the content of the resin solid content of the polychloroprene latex in the undercoat layer is too small, the adhesiveness of the formed undercoat layer tends to be poor, so that the content is 35% by weight or more. In particular, it is preferably 40% by weight or more.

The first aspect of the present invention is greatly characterized in that the tackifier is mixed with the undercoat, and the undercoat containing the tackifier is applied on a resin sheet and dried. The undercoat layer not only firmly adheres to the resin sheet, but also firmly adheres to the base material and exhibits excellent water resistance.

Typical examples of the tackifier include rosins such as gum rosin, wood rosin and tall oil rosin, hydrogenated rosins, disproportionated rosins, rosin derivatives such as polymerized rosins, terpene resins and terpene-phenol compounds. Examples thereof include resins, coumarone resins, and aliphatic hydrocarbon resins. Of these, rosin and rosin derivatives are particularly preferable in the present invention because they have excellent affinity with polychloroprene latex. Thus, the reason why rosin and rosin derivatives have excellent affinity with polychloroprene latex is not clear, but probably both rosin and rosin derivatives have the property of being easily dispersed uniformly in polychloroprene latex. It is thought that this is due to that.

There is no particular limitation on the form of the tackifier when the tackifier is blended with the polychloroprene latex, and examples thereof include dispersion and emulsion.

The blending amount of the tackifier cannot be unconditionally determined because it varies depending on the type of the tackifier, but if it is too much, a primer is applied and dried. Since there is a tendency that the physical properties such as adhesiveness and water resistance of the undercoat layer formed by the above are adversely affected, 100 parts or less relative to 100 parts of the solid content of the polychloroprene latex (weight part, the same applies below), It is preferably 70 parts or less, and when it is too small, the effect of promoting the adhesion between latexes by using such a tackifier becomes small, and the adhesiveness of the formed undercoat layer is reduced. Since it tends to become difficult to add, it is necessary to add 5 to 100 parts of the solid content of polychloroprene latex.
It is preferable that the amount is 10 parts or more, especially 10 parts or more.

The second aspect of the present invention is greatly characterized in that a heat-sensing agent is incorporated in the undercoating agent.

The heat sensitizer dehydrates at its cloud point by heating, deposits water and adsorbs it on the surface of the latex particles, thereby causing fusion of the latex particles, its ionic solubility and its ionic solubility. The interaction between the ions and the electrical double layer surrounded by the surface of the latex particles causes the fusion of the latex particles, resulting in the physical exclusion of water and the adhesion of latex particles to each other. .

Typical examples of the heat sensitizer include polyvinyl methyl ether, polypropylene glycol,
Examples include modified silicones and ammonium salts, which may be used alone or in admixture of two or more.

The weight average molecular weight of the polyvinyl methyl ether or polypropylene glycol is not particularly limited.

Representative examples of the modified silicone include functional polysiloxanes, modified silicone oils such as alcohol-modified silicone oils, silicone-glycol copolymers, and the like. There is no limit.

Representative examples of the ammonium salt include ammonium acetate and ammonium sulfate. When such an ammonium salt and zinc oxide are used in combination, the effect of promoting the adhesion between the latexes due to the ionic solubility and the interaction between the ions and the electric double layer surrounded by the surface of the latex particles. Is large, which is preferable.

The blending amount of the heat-sensitizer cannot be unconditionally determined because it depends on the kind of the heat-sensitizer and the like, but if it is too much, it is formed by applying a primer and drying it. Since there is a tendency that the physical properties such as the adhesiveness and water resistance of the prepared undercoat layer are adversely affected, the ratio of 3 to 100 parts of the solid content of the polychloroprene latex is
It is preferably 0 part or less, especially 10 parts or less, and when it is too small, the effect of promoting the adhesion between latexes due to the use of such a heat-sensitizing agent tends to be small, so that polychloroprene is preferred. It is preferably 0.5 part or more, especially 1 part or more per 100 parts of the solid content of the latex.

The undercoat used in the second invention is
In order to further improve the adhesiveness, the same tackifier as contained in the undercoating agent used in the first invention may be blended. In this case, the compounding amount of the tackifier may be the same as the compounding amount of the tackifier in the first invention.

To the undercoating agent used in the first and second inventions, a compounding agent generally used in latex can be added in order to impart desired coating properties and properties relating to adhesion.

Typical examples of the compounding agent include vulcanizing agents such as zinc white and sulfur, vulcanization accelerators, antioxidants,
Examples include softeners, colorants such as carbon black, fillers, dispersants, emulsifiers, stabilizers, thickeners, and crosslinking agents such as isocyanate compounds, but the present invention is not limited to these examples. Absent. Among the above-mentioned compounding agents, in particular, when zinc white is used, an undercoat layer having more excellent mechanical strength is formed, so in the present invention, zinc white is particularly preferably used. It is profitable.

Among these compounding agents, those which are not soluble in water are pulverized by using, for example, a ball mill, a homogenizer or the like to prepare an aqueous dispersion, or after being dispersed by using a surfactant, they are used. You can

The addition amount of the above-mentioned compounding agent cannot be unconditionally determined because it depends on the kind of the compounding agent,
It is preferable to make an appropriate adjustment within a range that does not impair the object of the present invention.

Examples of the method for applying the undercoating agent to the resin sheet include the commonly used methods such as curtain flow coater method, bar coater method and roll coater method, but the present invention is not limited to these examples. Not something.

After applying the above-mentioned undercoat onto a resin sheet,
An undercoat layer is formed by drying. In this case, if the thickness of the formed undercoat layer is too small, the adhesiveness tends to be poor, and if it is too large, the adhesiveness is poor and a uniform undercoat layer is formed. It tends to be difficult to form. Therefore, the thickness of the undercoat layer is usually 10 to 50 μm, especially 20
It is preferable to adjust the coating amount of the undercoating agent so that it is about 30 μm. The term "drying" as used herein means removing about 93% or more of water from the formed undercoat layer.

When the undercoating agent applied to one side of the resin sheet is dried, the heating temperature is usually a temperature at which the polychloroprene latex particles gel,
If the heating temperature is too high, the undercoat tends to be modified by heat, resulting in poor adhesion.
Usually, it is preferably about 50 to 200 ° C.

The waterproof sheet laminates of the first and second inventions thus obtained can be firmly adhered to a base material such as a cementitious base material, and the undercoat layer has heat resistance and water resistance. Since it has excellent properties, it can be suitably used for indoor and outdoor structures.

Typical examples of the base material to which the waterproof sheet laminate of the first and second inventions can be suitably applied include, for example, cement, mortar, concrete, cement materials made of various materials such as slate and the like. Examples include base materials. A typical example of the cementitious base material applied is a building or the like.

Adhesion of the waterproof sheet laminate of the present invention to the cementitious base material can usually be carried out at a construction site.

When the waterproof sheet laminate of the present invention is attached to a substrate, an adhesive is applied to the substrate, the organic solvent contained in the adhesive is volatilized and removed, and the adhesive is tacked. The waterproof sheet laminate may be attached during the generation.

Examples of the adhesive include B-75,
A chloroprene rubber adhesive such as Banply 80 ^-N (trade name, manufactured by Bando Kako Co., Ltd.) can be preferably used. The amount of such an adhesive applied cannot be unconditionally determined because it varies depending on the type of the base material, but usually 3
It may be about 00 to 500 g / m ² .

As described above, when the waterproof sheet laminate of the present invention is used, it is sufficient to use the adhesive only on the base material, and it is not necessary to use the adhesive on the waterproof sheet laminate. Therefore, the amount of organic solvent can be substantially halved by using the adhesive, so while the drying speed during on-site construction is almost the same as before, it is possible to significantly improve the effects on the human body and environmental problems. You can

Next, the waterproof sheet laminate of the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1 As a resin sheet, a vulcanized rubber waterproof sheet made of ethylene-propylene-diene terpolymer (band-sheet manufactured by Bando Kagaku KK, width 40 mm × length 200 mm)
X thickness 1.2 mm) was used.

Polychloroprene latex (Showa Denko
Stabilized rosin ester dispersion (super ester E-720 manufactured by Arakawa Chemical Industries Co., Ltd., solid content: 100 parts of DuPont Neoprene latex 400, solid content: 58% by weight) as a tackifier. 5
0% by weight) 40 parts, 2,2-methylenebis (4-methyl-6-t-butylphenol) dispersion as an anti-aging agent (solid content: 50% by weight) 2 parts, and acrylic acid ester emulsion polymerization as a thickener. Resin emulsion (Lacstar 94 manufactured by Dainippon Ink and Chemicals, Inc.)
29 A. 2 parts by weight (H, solid content: 30% by weight) were mixed to prepare an undercoating agent.

On one surface of the vulcanized rubber waterproof sheet, the obtained undercoating agent was adjusted using a roll coater so that the thickness of the undercoating layer after drying was 5, 10, 20, 30, 40 or 45 μm. Then, it was applied, heated to 80 ° C. and dried to obtain a waterproof sheet laminate.

Next, a slate plate (width 40 mm × length 2)
(00 mm × thickness 1.2 mm), one side of which is coated with a polychloroprene-based organic solvent type adhesive at a basis weight of 300 g / m ² and left as it is for about 30 minutes. The sheet laminate was overlaid with the undercoat layer surface, pressed by a pressing roller, and then cut into a test piece having a width of 25 mm.

Using the obtained test piece, the normal-state adhesive force was examined according to the following method. The result is shown in FIG.

(A) Adhesion under normal conditions After the obtained test piece was aged for one week, the peeling force of the waterproof sheet was 180 °, the peeling speed was 200 mm / min, and the peeling force was 25 ° C. (N / 25 mm width) was measured using an autograph.

From the results shown in FIG. 1, it is found that the adhesive strength of the waterproof sheet laminate is stable and excellent when the thickness of the undercoat layer is within the range of about 10 to 50 μm, and particularly within the range of 20 to 30 μm. Recognize.

Next, using a test piece formed so that the thickness of the undercoat layer was 30 μm, (b) the initial adhesive force,
(C) Water resistance and (D) heat resistance were examined according to the following methods. The results are shown in Table 1 together with the normal adhesive strength.

(B) Initial adhesive strength The obtained test pieces were aged for 1 hour and then measured in the same manner as in (a) above.

(C) Water-resistant adhesive strength The obtained test piece was dipped in a saturated aqueous solution of calcium hydroxide at 80 ° C. for 2 weeks and then measured in a wet state in the same manner as in (A) above.

(D) Heat-resistant adhesive strength The obtained test piece was allowed to stand in an oven at 80 ° C. for 2 weeks, cooled to room temperature, and then measured in the same manner as in (a) above.

Comparative Example 1 The same as Example 1 except that the same resin sheet as that used in Example 1 having no undercoat layer was used in place of the waterproof sheet laminate in Example 1. A test piece was prepared in the same manner.

Using the obtained test piece, the adhesive strength was examined in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 2 A test piece was prepared in the same manner as in Example 1 except that the undercoating agent used in Example 1 contained no tackifier.

Using the obtained test piece, the adhesive strength was examined in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 3 In Example 1, instead of the undercoat, a chloroprene rubber adhesive was used as a solvent-based adhesive (Vanply 80 ^-N manufactured by Bando Kako Co., Ltd., resin solid content: 25% by weight, main organic solvent: A test piece was prepared in the same manner as in Example 1 except that toluene was used.

As the physical properties of the obtained test piece, the adhesive strength was examined in the same manner as described above. The results are shown in Table 1.

[0062]

[Table 1]

From the results shown in Table 1, the following can be seen.

The test piece obtained in Comparative Example 1 was not provided with an undercoat layer, and any adhesion was compared with the test piece provided with the undercoat layer in Example 1. You can see that it is also inferior in strength.

The test piece obtained in Comparative Example 2 was prepared by using the undercoating agent without the tackifier added, and the tackifier obtained in Example 1 was added. It can be seen that the prepared undercoating agent is inferior in any adhesive force as compared with the test piece using the prepared undercoating agent. From this, it is understood that the adhesive force between the resin sheet and the slate plate can be increased by adding the tackifier to the undercoat.

The test piece obtained in Comparative Example 3 was one in which a conventional organic solvent-based adhesive was used for both the resin sheet and the slate plate. The test piece obtained in Example 1 was excellent in comparison with the test piece obtained in Comparative Example 3 even though no organic solvent-based adhesive was used on the resin sheet surface. It can be seen that it exhibits adhesive strength. From this, since the test piece obtained in Example 1 does not use the solvent-based adhesive in the resin sheet, the test piece obtained in Comparative Example 3 using the solvent-based adhesive was used. By comparison, it is clear that it is superior in terms of safety.

Example 2 In Example 1, zinc oxide dispersion (Radixex manufactured by Higashi Chemical Co., Ltd., solid content: 50% by weight) as a curing accelerator was added to 100 parts of polychloroprene latex as a primer. A test piece was prepared in the same manner as in Example 1 except that the mixture further mixed in a ratio of 6 parts was used instead of the undercoating agent used in Example 1.

When the adhesive strength of the obtained test piece was examined in the same manner as in Example 1, the initial adhesive strength was 23 N / 25 mm.
Width, normal adhesive strength is 35N / 25mm width, water resistant adhesive strength is 3
The width was 0 N / 25 mm and the heat resistant adhesive strength was 30 N / 25 mm.

From this, it is understood that the initial, normal state, water resistance and heat resistant adhesive strength can be improved by adding a curing accelerator to the undercoat.

Example 3 As a primer, 100 parts of polychloroprene latex (solid content: 50% by weight) was used as a tackifier, and stabilized rosin ester dispersion (Superester E- manufactured by Arakawa Chemical Industry Co., Ltd.) was used. 710, solid content:
50% by weight) 30 parts, 2,2-methylenebis (4-methyl-6-t-butylphenol) dispersion (solid content: 50% by weight) 2 parts as an anti-aging agent, polyvinyl methyl ether (BASF Corporation) as a heat-sensing agent. Made Lut
A mixture of an aqueous solution of onal M40, a resin solid content of 15 parts by weight (3 parts) and a zinc oxide dispersion (solid content: 33% by weight) of 5 parts as a curing accelerator was used.

On one surface of the same vulcanized rubber waterproof sheet used in Example 1, the undercoating agent was adjusted using a roll coater so that the thickness of the undercoating layer after drying was 30 μm. After forming the layer, it was heated to 80 ° C. and dried to obtain a waterproof sheet laminate. The change in water content of the undercoat layer at this time was examined. The result is shown by the curve A in FIG.

Example 4 An undercoating agent was prepared in the same manner as in Example 3 except that polyvinyl methyl ether was not used.
Then, after forming an undercoat layer in the same manner as in Example 1,
It was heated to 80 ° C. and dried to obtain a waterproof sheet laminate. The change in water content of the undercoat layer at this time was examined. The result is shown by the curve B in FIG.

As is clear from the curves A to B shown in FIG. 2, when the waterproof sheet laminate obtained in Example 3 is produced, the water contained in the undercoating agent should be quickly removed. You can see that

Next, using the undercoating agents obtained in Examples 3 and 4, a waterproof sheet laminate was prepared according to the following method, and the adhesive strength was used as the physical property of the waterproof sheet laminate of Example 1. I examined it in the same way. The results are shown in Table 2.

First, on one surface of the same resin sheet as used in Example 1, the undercoat layer obtained in Example 3 or Example 4 was dried using a roll coater so that the thickness of the undercoat layer was 30.
After adjusting so that it becomes μm, apply it at 90 ° C for 20
It was dried for a minute to obtain a waterproof sheet laminate.

On the other hand, a slate plate having the same size as the waterproof sheet laminate was prepared, and a chloroprene rubber adhesive (B-75 manufactured by Bando Kako Co., Ltd., a resin solid) was used as a solvent adhesive on one surface of the slate plate. Amount: 25% by weight, main organic solvent: toluene) was adjusted with a roller brush so that the weight per unit area after drying was 60 g / m ^2, and then applied.
It was dried at 5 ° C. for 30 minutes.

After that, the adhesive layer of the waterproof sheet was superposed on the coated surface of the chloroprene rubber adhesive, and was lightly pressed by a pressing roller to be bonded to obtain a test piece.

The adhesive strength of the obtained test piece was examined in the same manner as in Example 1. The results are shown in Table 2.

[0079]

[Table 2]

From the results shown in Table 2, the test piece obtained in Example 4 was prepared by using the undercoating agent containing no heat-sensitive agent, and the test piece obtained in Example 3 was used. It can be seen that the adhesive strength is slightly inferior to any of the test pieces using the undercoating agent containing the heat-sensitive agent.

[0081]

When the waterproof sheet laminate of the present invention is adhered to a base material, the organic solvent-based adhesive is not used for both the waterproof sheet laminate and the base material, but only on the base material side. Since the organic solvent-based adhesive can be firmly bonded to the base material only by using the organic solvent-based adhesive, it is possible to significantly reduce the amount of the organic solvent-based adhesive used as compared with the conventional case.
Accordingly, since the waterproof sheet of the present invention does not contain an organic solvent, it is excellent in fire safety, human safety and environmental hygiene.

Further, the waterproof sheet laminate of the present invention has an effect that it can be more firmly adhered to the base material as compared with the conventional waterproof sheet.

Further, since the waterproof sheet laminate of the present invention can be firmly adhered to the cementitious base material and the undercoat layer has excellent water resistance, it can be used for waterproofing construction such as buildings. It has an effect that it can be suitably applied to the above.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the undercoat layer thickness of the waterproof sheet laminate obtained in Example 1 of the present invention and the normal-state adhesive strength.

FIG. 2 is a graph showing changes with time in water content of an undercoat layer formed from an undercoat when obtaining a waterproof sheet laminate in Examples 3 and 4 of the present invention.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location C09J 7/02 JLF E04D 5/10 D 5/14 F

Claims (7)

[Claims] 1. A waterproof sheet laminate having an undercoat layer formed by applying an undercoating agent containing a tackifier and a polychloroprene latex on one surface of a resin sheet and drying. 2. The waterproof sheet laminate according to claim 1, wherein the tackifier is rosin or a derivative thereof. 3. An undercoating agent containing a heat-sensitizing agent and polychloroprene latex is applied to one side of a resin sheet,
A waterproof sheet laminate having an undercoat layer formed by drying. 4. The heat-sensing agent is polyvinyl methyl ether,
The waterproof sheet laminate according to claim 3, which is polypropylene glycol, modified silicone or ammonium salt. 5. The waterproof sheet laminate according to claim 3, wherein the undercoat layer contains a tackifier. 6. The waterproof sheet laminate according to claim 1, wherein the resin sheet contains ethylene-propylene-diene terpolymer as a main component. 7. The waterproof sheet laminate according to claim 1, wherein the undercoat layer has a thickness of 10 to 50 μm.