JPH10217396A - Waterproof sheet laminate and its executing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce or solve a problem such as volatilization of organic solvent at the time of executing of an adhesive for solvent waterproof sheet heretofore used or insufficient adhesive force of the adhesive for the sheet. SOLUTION: The waterproof sheet laminate comprises an undercoating layer obtained by coating one surface of a waterproof sheet with undercoating agent containing polychloroprene latex as a main component and drying it in such a manner that the latex for constituting the agent is a mixture of gel type latex and sol type latex. The agent preferably contains at least one type of rosin, its derivatives, phenol resin, xylene resin, or phenolterpene resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of producing a waterproof sheet laminate and using the produced waterproof sheet laminate in a waterproofing method. More specifically, in the technical field of manufacturing a waterproof sheet laminate that can be suitably used when performing waterproofing work on a foundation mainly composed of cement such as concrete or mortar, and using the manufactured waterproof laminated sheet in a waterproofing method Belongs to.

[0002]

2. Description of the Related Art As a waterproofing method for a cementitious base such as a concrete structure, there are an asphalt waterproofing method, a mortar waterproofing method, a sheet waterproofing method, a paint film waterproofing method and the like.
Among these, the sheet waterproofing method has been remarkably popular in recent years because of its simple construction.

[0003] In the sheet waterproofing method, an adhesive or a metal fitting is used when the waterproof sheet is joined to a cementitious base. However, the adhesive is often used because of its excellent waterproof performance.

Conventionally, a solvent-based polychloroprene adhesive has been mainly used as the adhesive. Usually, a method of directly applying the polychloroprene adhesive to both a waterproof sheet and a cementitious substrate at a construction site. Used in

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

As a means for avoiding the use of a large amount of solvent-based adhesives at construction sites, for example, Japanese Patent Application Laid-Open No. Hei 7-97840 discloses a method in which an adhesive is applied to a waterproof sheet in advance.
A method of applying an adhesive only to a ground surface at a construction site is described.

Further, as an adhesive which does not use an organic solvent,
An aqueous waterproofing sheet adhesive in which a hydraulic inorganic powder and a tackifying resin are mixed with rubber latex has been proposed (JP-A-57-200468).

Further, in Japanese Patent Application Laid-Open No. Hei 7-166659, a water-dispersible adhesive mainly composed of a highly safe acrylic emulsion or rubber latex is used as a waterproof sheet-side adhesive (hereinafter, a primer). Is described.

Among latexes used as water-based adhesives for waterproof sheets, Japanese Patent Application Laid-Open No.
As shown in Example 2 of the publication, polychloroprene latex is excellent in that it has good adhesiveness to a waterproof sheet and a base-side adhesive.

[0010]

However, when an undercoat layer is formed on a waterproof sheet by the method described in JP-A-7-97840, a large amount of organic solvent is volatilized in a factory (indoor). The problem of fire and worker poisoning becomes more important, and additional equipment such as solvent recovery and explosion protection becomes costly.

In addition, when the waterproofing sheet adhesive described in Japanese Patent Application Laid-Open No. 57-200468 is used, the waterproofing sheet cannot be firmly bonded to the base, and the adhesive force is liable to peel off. There is a problem in the point.

Further, among the water-based adhesives disclosed in Japanese Patent Application Laid-Open No. Hei 7-16659 and the like, polychloroprene latex having good adhesiveness to the waterproof sheet and the base-side adhesive can be used outdoors for a long period of time. In the case of an acrylic emulsion that has insufficient overall performance when used, especially water resistance of adhesive strength, and good latex stability, the adhesive holding power is poor when attaching a waterproof sheet to the substrate. In addition, there is a problem that floating occurs partially and uniform adhesive strength cannot be obtained.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the problem in the case of using the conventionally used adhesive for waterproof sheets as described above. A waterproof sheet laminate having an undercoat layer formed by applying an undercoat agent containing chloroprene latex as a main component and drying the undercoat layer, wherein polychloroprene latex constituting the undercoat agent is a gel type latex or a sol type latex. Wherein the primer is at least one of rosin, a derivative thereof, an aromatic petroleum resin, a phenol resin, a xylene resin, and a phenol-terpene resin.
2. The waterproof sheet laminate according to claim 1 containing a seed (claim 2), rosin contained in a primer, a derivative thereof, an aromatic petroleum resin, a phenol resin, a xylene resin, and a phenol-terpene resin. Has a softening point of 11
The waterproof sheet laminate according to claim 2 which is 0 ° C. or higher (claim 3), the waterproof sheet laminate according to claim 1, 2 or 3, wherein the primer contains zinc white, and the waterproof sheet. The waterproof sheet laminate according to claim 1, which is made of an ethylene-propylene-diene terpolymer, wherein the waterproof sheet is adhered and fixed to a base mainly composed of concrete or mortar. In a construction method, an undercoat layer side of the waterproof sheet laminate according to any one of claims 1, 2, 3, 4, and 5 is attached after applying an adhesive to a base surface and drying. The present invention relates to a method for applying a sheet laminate (claim 6).

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The waterproof sheet laminate of the present invention is applied to one surface of a waterproof sheet with an undercoating agent mainly composed of a blend of a gel type polychloroprene latex and a sol type polychloroprene latex, It is a laminate having an undercoat layer formed by drying.

The waterproof sheet used in the present invention includes:
For example, an unvulcanized waterproof sheet, a vulcanized waterproof sheet, a polychloroprene waterproof sheet, a chlorosulfonated polyethylene waterproof sheet, an ethylene-vinyl acetate resin waterproof sheet made of ethylene-propylene-diene terpolymer (EPDM), butyl rubber, a mixture thereof and the like. , A vinyl chloride resin waterproof sheet, a waterproof sheet obtained by laminating one of these waterproof sheets with another waterproof sheet, an asphalt-impregnated waterproof sheet obtained by impregnating asphalt into a base cloth made of a material constituting the waterproof sheet, and the like. Is raised.
Among these, a waterproof sheet made of ethylene-propylene-diene terpolymer, a waterproof sheet made of butyl rubber, and particularly a waterproof sheet made of ethylene-propylene-diene terpolymer have excellent mechanical strength such as durability and tensile strength. Is preferred.

The material constituting the waterproof sheet may include other components, for example, a softening agent such as process oil, a reinforcing agent such as carbon black, calcium carbonate, etc. in a range of not more than 50% (wt%). And the like may be contained.

The thickness of the waterproof sheet is not particularly limited, and may be appropriately selected according to the purpose and use. If the thickness of the waterproof sheet is too large, handling becomes inconvenient. Therefore, considering the use as the waterproof sheet, the thickness is preferably 3 mm or less, particularly preferably 2 mm or less.
Also, if the thickness of the waterproof sheet is too thin, it can be easily damaged during handling or use, so 0.5 mm or more,
In particular, it is preferably 1 mm or more.

The undercoating agent used in the present invention is an undercoating agent mainly composed of a blend of the gel type polychloroprene latex and the sol type polychloroprene latex as described above.

The main component in the above-mentioned undercoat means that the solid content of the undercoat is at least 50%, more preferably at least 60%, and the upper limit is sufficient tackiness without adding other components. If it is obtained, it is 100%, and if the tackiness is insufficient without adding other components, a tackifier is added, so that the content is 95% at this time. Agents, thickeners, stabilizers, crosslinking aids and the like.

The gel type polychloroprene latex contained in the undercoat has a high adhesive strength to the substrate of the waterproof sheet laminate of the present invention, and has a coefficient of thermal expansion with the substrate in an operating temperature range of about -30 to 90 ° C. It has a viscoelasticity that allows the difference, but has no fluidity,
It is a component used for imparting excellent properties such that the initial tack (adhesion) with the base required for fine adjustment of the attachment is not excessively large.

On the other hand, in the sol-type polychloroprene latex, the undercoat layer becomes a uniform and dense film, that is, the film strength of the undercoat layer does not vary from place to place, maintains a high strength, and smoothes the film surface. It is a component used to prevent the generation of pinholes.

The gel type polychloroprene latex is a small amount of chloroprene (usually 0.1 to 5.0%, preferably 0.3 to 1.3% based on chloroprene).
Polymerized by adding a cross-linkable monomer such as 2,3-dichlorobutadiene. The formed film is sticky and has an appropriate tensile strength, so it has excellent mechanical properties and an appropriate tack. And has a characteristic of exhibiting good adhesiveness to a waterproof sheet such as an inactive EPDM sheet.

The sol-type polychloroprene latex is obtained by polymerizing chloroprene without adding a crosslinkable monomer such as 2,3-dichlorobutadiene, and has a low molecular weight and a high strength. To obtain a coating, vulcanization is necessary, but the coating has features such as denseness and excellent adhesion to an adherend.

Specific examples of the polychloroprene latex include 2-chloro-1,3-butadiene and 2,3-
Latex of copolymer with dichloro-1,3-butadiene (gel type latex) and 2-chloro-1,3-butadiene
Examples thereof include a mixture with a polychloroprene latex (a sol type latex) that is a polymer of butadiene.

If the resin solids content in the polychloroprene latex is too high, it tends to be unstable to mechanical stimuli, so that it is 70% or less, especially 60% or less. Is preferred, and
If it is too low, a large amount of energy will be required to evaporate water during drying.
Preferably, it is at least 40%.

Since the undercoat layer of the present invention is formed from a mixture of a gel type polychloroprene latex and a sol type polychloroprene latex, the mechanical properties when the gel type polychloroprene latex is used are excellent, and An undercoat layer with high tack strength and high tensile strength is formed. When attaching a waterproof sheet to a mortar base surface, it has the characteristics of good workability, etc. A waterproof sheet laminate is obtained which has the disadvantage that the film is made of a sol-type polychloroprene latex, which has the disadvantage that the adhesion to the body is not sufficient. That is, by blending the two, the inferior density of the gel type polychloroprene is covered by the sol type polychloroprene, and while maintaining high adhesiveness and appropriate film strength, the denseness of the film, A waterproof sheet laminate having improved adhesiveness to the agent and improved adhesive water resistance is obtained.

When the mixture of the gel type polychloroprene latex and the sol type polychloroprene latex is used, the mixing ratio is such that the undercoat layer gradually undergoes a crosslinking reaction after the waterproof sheet is attached to the base. When zinc white is used in combination, the solid content ratio is 30/70 to 90/10, and the sol content is crosslinked after film formation, so that sufficient adhesive strength can be obtained even with a high sol content. And more preferably 50/50 to 90/10. If the proportion of the gel-type polychloroprene latex is too small, the tack becomes small, and the workability is reduced. If the proportion is too large, the effect of using the sol-type polychloroprene latex tends to be insufficient. When zinc white is not used in combination, the ratio of gel type polychloroprene latex / sol type polychloroprene latex is 30 / solid content ratio.
70-90 / 10 is preferable, and 50 / 50-90 / 10 is preferable.
Is more preferred.

Specific examples of the gel type polychloroprene latex include Neoprene latex 400 (solid content: about 15%) manufactured by Showa Denko DuPont.
%, PH 11.5 or higher, latex specific gravity 1.15, polymer specific gravity 1.45, B-type viscosity (No. 1 spindle,
Measured at 30 rpm) 9 cps, surface tension 37 dynes / c
m, average particle diameter 0.12 μm, type of polymer intermediate gel), 750 (solid content about 50%, pH 12 or more, latex specific gravity 1.11, polymer specific gravity 1.25, B-type viscosity (No. 1 spindle, Measured at 30 rpm) 10 cp
s, surface tension 39 dyne / cm, average particle size 0.12μ
650 (solid content: about 60%, pH 12 or more, latex specific gravity 1.12, polymer specific gravity 1.25, B-type viscosity (No. 2 spindle,
465 cps, surface tension of 39 dynes / cm, average particle diameter of less than 0.12 μm, type of polymer intermediate gel), 842-A (solid content: about 50%, pH)
12 or more, specific gravity of latex 1.11, specific gravity of polymer 1.
23, B type viscosity (No. 1 spindle, measured at 30 rpm) 15 cps, surface tension 38 dynes / cm, average particle diameter 0.12 μm, polymer type advanced gel), 60
1-A (solid content: about 60%, pH 11.5 or more, specific gravity of latex 1.12, specific gravity of polymer 1.23, viscosity of type B (No. 2 spindle, measured at 30 rpm) 140 cp
s, surface tension 36 dynes / cm, average particle size 0.12μ
m, polymer type advanced gel), 671A (solid content about 59%, pH 12 or more, latex specific gravity 1.1)
3, polymer specific gravity 1.23, B-type viscosity (No. 1 spindle, measured at 30 rpm) 45 cps, surface tension 41 dynes / cm, average particle diameter 0.21 μm, polymer type intermediate gel), 572 (solid content: approx. 50%, pH 1
1.5 or more, specific gravity of latex 1.11, specific gravity of polymer 1.23, B-type viscosity (No. 1 spindle, 30 rpm
10 cps, surface tension 38 dyne / cm, average particle diameter 0.12 μm, polymer type advanced gel), Denkachloroprene latex L manufactured by Denki Kagaku Kogyo Co., Ltd.
A-50 (solid content 50%, pH (immediately after production) 12 or more,
Viscosity 10 cps or more, charge type anion, polymer type gel), LM-50 (solid content 50%, pH
(Immediately after production) 12 or more, viscosity 10 cps or more, charge type anion, polymer type gel), LM-60
(Solid content 60%, pH (just after production) 12 or more, viscosity 20)
0 to 400 cps, charge type anion, polymer type gel), and LV-60 (solid content 60%, pH (immediately after production) 12 or more, viscosity 200 to 400 cps, charge type anion, polymer type gel) and the like. . Among them, a type having a relatively low crystallization rate, that is, neoprene latex 750, 650,
842-A, 601-A, 671A, Denkachloroprene latex LM-50, LM-60, LV-60 are preferable because they show stable tack.

Specific examples of the sol-type polychloroprene latex include Neoprene latex 635 manufactured by Shoden DuPont (solid content: about 58%, pH:
11 or more, specific gravity of latex 1.12, specific gravity of polymer 1.
23, Type B viscosity (No. 2 spindle, measured at 30 rpm) 450 cps, surface tension 38 dynes / cm, average particle diameter less than 0.12 μm, polymer type sol), 7
36 (solid content about 34.5%, pH 11.5 or more, latex specific gravity 1.06, polymer specific gravity 1.23, B-type viscosity (No. 1 spindle, measured at 30 rpm) 6 cps,
Surface tension 41 dyne / cm, average particle diameter 0.12 μm,
Polymer type sol), Denka chloroprene latex LP-30 (solid content 35%, manufactured by Denki Kagaku Kogyo Co., Ltd.)
pH (immediately after production) 10 or more, viscosity 10 cps or less, charge type anion, polymer type sol), and the like.

The undercoating agent contains at least one of rosin, a so-called tackifier, a derivative thereof, an aromatic petroleum resin, a phenol resin, a xylene resin, and a phenol-terpene resin (hereinafter also referred to as rosin, etc.). However, the tackiness can be increased without lowering the mechanical strength of the undercoat layer containing a large amount of the gel type polychloroprene latex and the adhesive strength to a sheet such as EPDM. As a result, the adhesion between the waterproof sheet and the undercoat layer is further improved. Further, when the softening temperature of the rosin or the like is 110 ° C. or more, the dispersion stability of the obtained undercoat is improved, and the undercoat containing rosin or the like is applied to a waterproof sheet and dried. The formed undercoat layer not only strongly adheres to the waterproof sheet,
It is more preferable from the viewpoint of firmly adhering to the base. The softening temperature of rosin or the like is preferably about 140 ° C. or lower in order to impart sufficient tackiness. The softening temperature is a temperature determined by the ring and ball method.

Specific examples of the rosin include, for example, gum rosin, wood rosin and tall oil rosin, and specific examples of the rosin derivative include hydrogenated rosin, disproportionated rosin, and polymerized rosin. On the other hand, examples of the aromatic petroleum resin include a so-called aromatic petroleum resin such as Nisseki Neopolymer 120. Of these, rosin and rosin derivatives can be suitably used because they have excellent affinity with polychloroprene latex. The reason why rosin and rosin derivatives have a good affinity for polychloroprene latex is not clear, but it is probably because both rosin and rosin derivatives have properties that facilitate their uniform dispersion in polychloroprene latex. It is thought that it is. In addition, aromatic petroleum resins, phenolic resins, xylene resins, and phenol-terpene resins have good compatibility with petroleum hydrocarbon compounds generally used as softeners for waterproof sheets, and have good adhesion to waterproof sheets. This is also preferred because it improves.

There is no particular limitation on the form of the rosin or the like when the rosin or the like is blended with the polychloroprene latex, and for example, those in the form of a dispersion or an emulsion may be used.

Since the amount of rosin and the like varies depending on the type and the like, it cannot be specified unconditionally. However, if the amount is too large, the adhesive strength between the waterproof sheet laminate and the base after construction, water resistance, etc. Of polychloroprene latex, since it tends to adversely affect the physical properties of
100 parts or less for 0 parts (solid content), especially 80
Or less, more preferably 40 parts or less in order to further improve the adhesion between the waterproof sheet laminate and the undercoat layer. When the amount of rosin or the like is too small, the effect of promoting the adhesion of latex due to the use of rosin or the like is reduced, and the adhesiveness of the formed undercoat layer is sufficiently improved by using the rosin or the like. Since it is not improved, it is preferable to use 5 parts or more, especially 20 parts or more, per 100 parts of polychloroprene latex.

When the resin solid content of the polychloroprene latex in the undercoat layer is too low,
Since the adhesive strength of the formed undercoat layer tends to be inferior, it is preferably 35% or more, particularly preferably 40% or more.

The undercoating agent used in the present invention may contain a compounding agent generally used in latex in order to impart desired coating properties and adhesion-related properties.

Representative examples of the compounding agents include vulcanizing agents such as zinc white and sulfur, vulcanization accelerators, antioxidants,
Softeners, coloring agents such as carbon black, fillers, dispersants, emulsifiers, stabilizers, thickeners, crosslinking agents such as isocyanate compounds, and the like, but the present invention is not limited only to such examples. Absent.

[0037] When zinc white is used among the above-mentioned components, an undercoat layer having more excellent mechanical strength is formed, so that it can be used particularly preferably. When zinc white is used, the undercoat layer gradually undergoes a cross-linking reaction, so that a high adhesive strength can be obtained even if the gel content is high.

Among the above-mentioned compounding agents, those which do not dissolve in water may be used after being pulverized using, for example, a ball mill, a homogenizer or the like to form an aqueous dispersion or dispersed using a surfactant.

Since the amount of the compounding agent varies depending on the type of the compounding agent, it cannot be specified unconditionally, but may be appropriately adjusted within a range that does not impair the object of the present invention.

For example, when zinc white is used, 0.5 to 10 parts, more preferably 1 to 5 parts, of 100 parts (solid content) of the primer is excellent in mechanical strength and has sufficient water-resistant adhesiveness. It is preferable in terms of holding.

As a method of applying the above-mentioned undercoat agent to the waterproof sheet, a commonly used method, for example, a curtain flow coater method, a bar coater method, a roll coater method and the like can be mentioned, but the present invention is not limited to such examples. Not something.

After applying the primer to a waterproof sheet,
By drying, an undercoat layer is formed. In this case, if the thickness of the formed undercoat layer is too thin, the adhesiveness tends to be inferior, and if it is too thick, the adhesiveness is poor and a uniform undercoat layer is formed. It tends to be difficult. Therefore, it is preferable to adjust the application amount of the undercoat so that the thickness of the undercoat layer is usually about 10 to 50 μm, especially about 20 to 30 μm. In addition, the drying means that about 93% or more of water is removed from the formed undercoat layer so that the coating film is integrated.

When the undercoating agent applied to one side of the waterproof sheet is dried, the heating temperature may usually be a temperature at which the latex particles gel, but if the heating temperature is too high, Since the primer and the waterproof sheet tend to be denatured by heat and have a poor adhesive strength, the
The temperature is preferably about 0 to 200 ° C.

The thus obtained waterproof sheet laminate of the present invention can be firmly adhered to a base material mainly composed of cement such as concrete or mortar, and the undercoat layer is conventionally used. It is excellent in heat resistance and water resistance as compared with an undercoat layer made of only gel type polychloroprene latex, and thus can be suitably used for indoor and outdoor buildings.

Representative examples of the base to which the waterproof sheet laminate of the present invention can be suitably applied include bases mainly composed of cement made of various materials such as concrete, mortar and slate. Can be. As a typical example of the groundwork containing cement as a main component, there is, for example, a building.

Adhesion of the waterproof sheet laminate of the present invention to a substrate is usually performed at a construction site.

When the waterproof sheet laminate of the present invention is adhered to a base and applied, an adhesive is applied to the base, the solvent contained in the adhesive is removed, and the adhesive is dried (adhesive). After that, the undercoat layer of the waterproof sheet laminate may be adhered to the base surface while the adhesive has the tack.

As the adhesive, for example, B-75,
Adhesives containing polychloroprene as a main component, such as chloroprene rubber solvent-based adhesives such as Bumply 80- ^N (trade names, manufactured by Bando Kozai Co., Ltd.) and polychloroprene latex-based adhesives are preferably used.

It is preferable to add a tackifier to the adhesive in order to firmly adhere the waterproof sheet laminate and the base.

Examples of the tackifier include rosin and its derivatives, aromatic petroleum resins, phenol resins, xylene resins, phenol terpene resins, terpene resins, and terpene-phenols used in the undercoat layer of a waterproof sheet laminate. Resin, coumarone resin, aliphatic hydrocarbon resin, aromatic hydrocarbon resin (however, excluding aromatic petroleum resin)
And the like. In particular, rosin and the like used in the undercoat layer of the waterproof sheet laminate are used in order to improve the affinity between the adhesive and the undercoat layer of the waterproof sheet laminate and to enhance the adhesion between the waterproof sheet laminate and the base. It is preferably the same or the same. The same kind here means that the kind of the rosin and the like and the tackifier are the same, for example, their molecular weight, softening temperature and the like may be the same or different, and particularly limited. Absent.

The amount of the tackifier added to the adhesive is set so that the adhesive has a certain degree of tack when the adhesive is applied to a substrate and semi-dried or dried. The amount is preferably 20 to 80 parts, more preferably 25 to 70 parts, based on 100 parts (solid content) of polychloroprene.

The amount of the adhesive to be applied cannot be specified unconditionally because it varies depending on the type of the base material.
What is necessary is just about 00-500 g / m < ² >.

As described above, when the waterproof sheet laminate of the present invention is used, it is only necessary to use an adhesive for the base, and it is not necessary to apply the adhesive to the waterproof sheet laminate. Even when a system-based adhesive is used, the amount of solvent by using the solvent-based adhesive can be substantially reduced by half, so that even if the drying speed at the time of on-site construction is almost the same as the conventional one, the The impact and environmental problems can be greatly improved.

[0054]

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these. It is not something to be done.

Table 1 shows main components used in Examples and Comparative Examples.

[0056]

[Table 1]

Examples 1 to 8 and Comparative Examples 1 to 4 A gel type polychloroprene latex and a sol type polychloroprene latex were respectively CR
2 (neoprene latex 400) and CR1 (neoprene latex 635) were used at the ratio (solid content) shown in Table 3 so that the total amount was 100 parts (solid content), and A (Superester E730) was used as a tackifier. -55) 30 parts (solid content), La as a thickener
A base coat was prepared by adding 2 parts (solid content) of cstar (Lacstar 9429A) and the amount of zinc white shown in Table 3.

EPDM vulcanized rubber sheet (Bando sheet manufactured by Bando Chemical Co., Ltd., width 40 mm × length 200 m)
mx 1.2 mm) on one side, using a roll coater to apply the obtained primer to a thickness of 30 μm after drying, and heat to 80 ° C to dry and remove 97% of water. Thus, a waterproof sheet laminate was manufactured.

Next, a slate plate (width 40 mm × length 2)
Chloroprene rubber solvent-based adhesive (Bundo Koki Co., Ltd. B)
-75, solid content 26%, solvent toluene), basis weight 300
g / m ² , and left as it is for about 30 minutes. Then, the surface to which the adhesive is applied and the undercoat layer surface of the waterproof sheet laminate are overlapped and pressed with a pressing roller. A test piece was obtained by cutting to obtain a test piece.

Using the obtained test pieces, the adhesive force was examined according to the following method. Table 2 shows the results.

(A) Adhesive Strength After the obtained test piece was cured for 1 hour, it was peeled off under the conditions of a peeling angle of the waterproof sheet of 180 °, a peeling speed of 200 mm / min, and a measuring temperature of 25 ° C. The force (N / 25 mm width) at that time was measured using an autograph.

(B) Normal adhesive strength After the obtained test pieces were cured for one week, they were measured in the same manner as in the above (a).

(C) Adhesion Resistance to Water After the obtained test piece was immersed in a saturated aqueous solution of calcium hydroxide at 80 ° C. for 2 weeks, it was measured in the wet state in the same manner as in (a).

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

[0065]

[Table 2]

Examples 9 to 11 Each of a gel type polychloroprene latex and a sol type polychloroprene latex was CR
3 (neoprene latex 750) and CR1 (neoprene latex 635) in the ratio (solid content) shown in Table 3 so that the total amount becomes 100 parts (solid content), and A (Superester E730) was used as a tackifier. -55) 30 parts (solid content) and thickener Las
tar (Lacstar 9429A) 2 parts (solid content)
Was prepared.

The adhesive strength was evaluated in the same manner as in Example 1 except that the obtained undercoat was used. Table 3 shows the results.

Comparative Example 5 CR3 was used as a gel type polychloroprene latex.
100 parts (solid content) and A as tackifier
An adhesive was prepared by adding 2 parts of a thickener (Lacstar) to 30 parts (solid content).

The adhesive strength was evaluated in the same manner as in Example 1 except that the obtained undercoat was used. Table 3 shows the results.

[0070]

[Table 3]

[0071]

When the waterproof sheet laminate of the present invention is used, the waterproof sheet and the base material mainly composed of concrete or mortar, for example, are coated with a solvent-based polychloroprene adhesive and adhered during construction. The problem of safety and health and environmental protection due to volatilization of the organic solvent is reduced. In addition, since the undercoat layer contains gel-type polychloroprene, the undercoat layer has excellent mechanical strength when formed into a film and has an appropriate tack.
As a result, it shows good adhesiveness even to an inert waterproof sheet on the surface. Also, the sol-type polychloroprene latex used together has the effect of increasing the adhesion between the waterproof sheet and the undercoat layer and increasing the density of the undercoat layer, and has the effect of increasing the water-resistant adhesive strength. Furthermore, since the undercoat layer is formed by applying a water-based adhesive, the solvent to be volatilized is mainly water, and there is little fear of fire or poisoning of workers as in the case of volatilizing an organic solvent. The cost of ancillary equipment such as collection and explosion proof is reduced.

Claims (6)

[Claims] 1. A waterproof sheet laminate having an undercoat layer formed by applying a primer having polychloroprene latex as a main component to one surface of a waterproof sheet and drying the same, wherein A waterproof sheet laminate in which chloroprene latex is a mixture of a gel type latex and a sol type latex. 2. The waterproof sheet laminate according to claim 1, wherein the primer comprises at least one of rosin, a derivative thereof, a phenol resin, a xylene resin, and a phenol-terpene resin. 3. Rosin contained in a primer, a derivative thereof,
The waterproof sheet laminate according to claim 2, wherein at least one softening point of an aromatic petroleum resin, a phenol resin, a xylene resin, and a phenol-terpene resin is 110C or higher. 4. The method according to claim 1, wherein the primer contains zinc white.
Or the waterproof sheet laminate according to 3. 5. The waterproof sheet laminate according to claim 1, wherein the waterproof sheet is made of an ethylene-propylene-diene terpolymer. 6. A construction method for bonding and fixing a waterproof sheet to a base material mainly composed of concrete or mortar, wherein an adhesive is applied to the base surface and dried, and then, A method for constructing a waterproof sheet laminate, characterized in that the undercoat layer side of the waterproof sheet laminate according to 5 is bonded.