JPH08337766A - Adhesive for waterproof sheet and method of constructing waterproof sheet using the same - Google Patents

Abstract

PURPOSE: To obtain the subject adhesive mainly composed of a rubber latex and a viscosity enhancer, which is safe and highly resistant to water, and useful when executing waterproof constructions for buildings or the like made of a cement material. CONSTITUTION: This adhesive is mainly composed of (A) a rubber latex (preferably a polychloroprene latex) and (B) a viscosity enhancer (preferably a rosin, a rosin derivative or an aromatic petroleum resin). The amount of the component B is preferably 30-80 pts.wt. based on 100 pts.wt. of the solid content of the component A. The adhesive preferably contains (C) a heat sensitizer in addition to the main components. The execution of a waterproof sheet can be carried out by applying the adhesive for the waterproof sheet onto a cement material, and bonding the waterproof sheet (preferably a vuulcanized rubber sheet mainly composed of an ethylene-propylene-diene terpolymer) thereto.

Description

Detailed Description of the Invention

[0001]

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

[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 very popular in recent years because of 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, there has been proposed an adhesive agent for water-based waterproof sheets, which comprises an inorganic hydraulic powder as a main component and a rubber latex mixed with a tackifier resin (JP-A-57-57). No. 200488).

However, when the above-mentioned waterproof sheet adhesive is used, the waterproof sheet and the substrate cannot be firmly adhered to each other, and there is a problem in terms of adhesive strength that peeling easily occurs. There is also a problem in terms of water resistance.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, in which a waterproof sheet is adhered by using a water-based waterproof sheet adhesive agent without using any organic solvent. It is an object of the present invention to provide a waterproof sheet adhesive that can be firmly bonded to a cementitious base material and is excellent in water resistance, and a waterproof sheet construction method using the same.

[0009]

The present invention provides a waterproof sheet adhesive comprising a rubber latex and a tackifier as main components, and a waterproof sheet after the waterproof sheet adhesive is applied to a cementitious base material. The present invention relates to a method for constructing a waterproof sheet, which comprises bonding

[0010]

FUNCTION AND EXAMPLE The adhesive for a waterproof sheet of the present invention is
It is mainly composed of rubber latex and a tackifier. In addition, in this invention, having rubber latex and a tackifier as a main component means that both are contained 50 weight% or more in total solid content in the adhesive agent for waterproof sheets.

Since no organic solvent is used in the waterproof sheet adhesive of the present invention, the organic solvent does not evaporate during construction. Further, since the adhesive layer applied and formed on the cementitious base material has appropriate viscoelasticity by using the rubber latex and the tackifier together, for example, the cementitious base material and the waterproof sheet. The stress generated due to the difference in the coefficient of thermal expansion is relaxed and the concentration of stress at the interface between the cementitious base material and the adhesive layer and at the interface between the adhesive layer and the waterproof sheet is eliminated, providing excellent adhesive strength. It has the feature of holding it.

Typical examples of the rubber latex include natural rubber (isoprene rubber) latex, styrene-butadiene rubber latex, nitrile rubber tex, chloroprene rubber latex and the like. These may be used alone or in admixture of two or more. Can be used. Of these, chloroprene rubber latex is particularly preferably used in the present invention because it has good adhesiveness to the cementitious base material and the waterproof sheet and forms an adhesive layer having excellent mechanical strength. It is profitable.

As the polychloroprene latex, for example, polychloroprene latex of 2-chloro-1,3-butadiene, and co-weight of 2-chloro-1,3-butadiene and 2,3-dichloro-1,3-butadiene. Examples thereof include a combined latex, and these may be used alone or in admixture of two or more.

If the resin solid content in the rubber latex typified by the polychloroprene latex is too large, it tends to be unstable with respect to mechanical stimulation. Above all, it is preferably 60% by weight or less, and if it is too small, it tends to require a large amount of energy to evaporate water at the time of drying.
Above all, it is preferably 40% by weight or more.

One of the major features of the present invention is that a tackifier is incorporated in the waterproof sheet adhesive. When the tackifier is mixed with the waterproof sheet adhesive, not only can the waterproof sheet and the cementitious base material be firmly bonded, but also excellent water resistance can be imparted.

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-based resins and terpene-phenol-based resins. Examples thereof include resins, coumarone resins, aliphatic petroleum resins, aromatic petroleum resins, and the like, which may be used alone or in admixture of two or more.

Among the above tackifiers, rosin, rosin derivatives and aromatic petroleum resins, especially when used in combination with rubber latex, especially chloroprene rubber latex, form an adhesive layer formed. It can be used particularly preferably because it further enhances the adhesive strength between the waterproof sheet and the cementitious base material without lowering the excellent mechanical strength peculiar to chloroprene rubber and imparts further excellent water resistance and heat resistance. It is a thing.

There is no particular limitation on the form of the tackifier when blending the tackifier with rubber latex,
Examples of the form include dispersion and emulsion.

The amount of the tackifier blended cannot be unconditionally determined because it varies depending on the type of the tackifier, but in order to impart a sufficient adhesive force, the solid content of the rubber latex is required. It is preferably 30 parts or more, especially 40 parts or more with respect to 100 parts (parts by weight, the same hereinafter), and in order not to reduce the mechanical strength and water resistance of the formed adhesive layer, 80 parts or less per 100 parts of solid content, especially 7
It is preferably 0 part or less.

In the present invention, it is preferable to add a heat sensitive agent to the waterproof sheet adhesive.

The addition of the heat-sensitive agent has a great advantage that the drying speed of the adhesive after coating can be increased and the time required for the construction can be shortened.

The heat sensitizer dehydrates at its own cloud point by heating, deposits water and adsorbs it on the surface of the latex particles to cause fusion of the latex particles, its ionic solubility and its The interaction of the electric double layer between the ions and the surface of the latex particles causes the fusion of the latex particles, resulting in the physical elimination of water and the promotion of the adhesion between the latex particles.

Typical examples of the heat sensitizer include polyvinyl methyl ether, polypropylene glycol, modified silicone, ammonium salt, and the like.
These 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.

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

The blending amount of the heat-sensitizer cannot be unconditionally determined because it varies depending on the kind of the heat-sensitizer, but if it is too much, the adhesiveness of the adhesive layer, water resistance, etc. Since it tends to adversely affect the physical properties of the rubber latex, it is preferably 30 parts or less, especially 10 parts or less, relative to 100 parts of the solid content of the rubber latex. Since the effect of promoting the adhesion of the latexes to each other due to the use of the agent tends to be small, it is preferably 0.5 part or more, especially 1 part or more with respect to 100 parts of the solid content of the rubber latex.

To the waterproof sheet adhesive of the present invention, a compounding agent generally used in latex can be added in order to impart desired coating properties and adhesive properties.

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, when zinc white is used, an adhesive layer having more excellent mechanical strength is formed, so in the present invention, the zinc white can be particularly preferably used. Is.

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 compounding agent cannot be unconditionally determined because it varies depending 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.

The waterproof sheet adhesive of the present invention contains no organic solvent at all, and is a cementitious base material rather than the case where the waterproof sheet is adhered using a conventional water-based waterproof sheet adhesive. It can be firmly adhered to and has excellent water resistance.

According to the waterproof sheet construction method of the present invention,
The waterproof sheet can be constructed by applying the waterproof sheet adhesive to the cementitious base material and then bonding the waterproof sheet.

The waterproof sheet is not particularly limited, but typical examples thereof include an unvulcanized rubber sheet and a vulcanized rubber sheet made of ethylene-propylene-diene terpolymer, butyl rubber, a mixture thereof, and a poly. Chloroprene rubber sheets, chlorosulfonated polyethylene rubber sheets, ethylene-vinyl acetate resin sheets, vinyl chloride resin sheets, sheets obtained by laminating other sheets on these sheets, and base fabric made of resin components constituting the sheets. Examples include asphalt-impregnated sheets impregnated with asphalt. Among these, a sheet containing ethylene-propylene-diene terpolymer as a main component, a sheet containing butyl rubber as a main component, and among them, a vulcanized rubber sheet containing an ethylene-propylene-diene terpolymer as a main component, It is preferable because it has excellent mechanical strength such as durability and tensile strength. 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 waterproof sheet is not particularly limited and may be appropriately selected depending on the purpose, application, etc. If the thickness of the waterproof sheet is too large, the handling becomes inconvenient. Therefore, considering the application as a waterproof sheet, it is preferably 3 mm or less, particularly 2 mm or less. If the thickness of the waterproof 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.

An undercoat layer containing polychloroprene as a main component may be provided on one surface of the waterproof sheet. In this way, when the undercoat layer is provided on one surface of the waterproof sheet, the amount of adhesive applied at the construction site can be reduced, and the drying time of the adhesive can be greatly shortened. There are advantages.

As a method for forming an undercoat layer on one surface of the waterproof sheet, for example, a method of applying a polychloroprene solution, chloroprene rubber latex or the like to one surface of the waterproof sheet and drying it, a method of laminating a dry film of polychloroprene, etc. can give. Incidentally, these polychloroprene solution, chloroprene rubber latex, etc., additives that are compounded in ordinary rubber and adhesives, such as tackifiers, plasticizers, reinforcing agents, vulcanizing agents, vulcanization aids, aging You may add an inhibitor etc. suitably.

The resin (rubber) components and additives used in the undercoat layer and those used in the adhesive for waterproof sheets have the same composition and physical properties as much as possible from the viewpoint of improving the adhesive strength. Or it is preferable that they are similar.

If the thickness of the undercoat layer is too small, the adhesion tends to be poor, and if it is too large, the adhesion is poor and a uniform undercoat layer is formed. Tends to be difficult. Therefore, the thickness of the undercoat layer is usually 10 to 50 μm, especially 2
It is preferable to adjust the coating amount of the undercoat agent so as to be about 0 to 30 μm.

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

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

When the waterproof sheet is attached to the cementitious base material, the adhesive material for waterproof sheet of the present invention is applied to the cementitious base material, and the solvent contained in the adhesive agent is evaporated.
The waterproof sheet may be attached while the adhesive is tacky.

Among the adhesives for waterproof sheets of the present invention, particularly, the polychloroprene latex is compared with other rubber latex or solvent-based adhesive, and the tackiness of the adhesive layer obtained by coating. Since it does not grow unnecessarily, it is extremely excellent in workability, which is often a problem at construction sites, such as walking on the adhesive layer and reattaching the sheet.

As described above, when the adhesive for waterproof sheet of the present invention is used, it is only necessary to use the adhesive for the cementitious base material, and the adhesive is used for the waterproof sheet at the construction site. Since it is not necessary, there is an advantage that the amount of adhesive can be substantially halved.

The coating amount of the waterproof sheet adhesive of the present invention is
Although it cannot be unconditionally determined because it depends on the type of cementitious base material, it is usually about 150 to 500 g / m ² .

Next, the adhesive for a waterproof sheet of the present invention and the method for constructing a waterproof sheet using the same will be described in more detail based on examples, but the present invention is not limited to these examples. Absent.

Examples 1 to 7 Polychloroprene latex as a rubber latex (Neoprene latex 40 manufactured by Showa Denko DuPont Co., Ltd.)
0, solid content: 58% by weight, modified rosin ester (super ester E730-55 manufactured by Arakawa Chemical Industry Co., Ltd.) as a tackifier, or aromatic petroleum resin (Neopolymer 120 manufactured by Nippon Petrochemical Co., Ltd.) Of the emulsified product (solid content: 50% by weight), and an acrylic acid ester-based emulsion polymerized resin emulsion (Lacstar 9429A.H manufactured by Dainippon Ink and Chemicals, Inc., solid content: 30% by weight) as a thickener. An adhesive for a waterproof sheet was prepared by mixing in the proportions shown in.

[0048]

[Table 1]

Production Examples 1 and 2 (Preparation of Undercoating Agent for Waterproof Sheet) Polychloroplan latex as a rubber latex (Neoprene latex 40 manufactured by Showa Denko DuPont Co., Ltd.)
0, solid content: 58% by weight, modified rosin ester (super ester E730-55 manufactured by Arakawa Chemical Industry Co., Ltd.) as a tackifier, or aromatic petroleum resin (Neopolymer 120 manufactured by Nippon Petrochemical Co., Ltd.) Of the emulsified product, solid content: 50% by weight, and an acrylic acid ester emulsion polymerized resin emulsion (Lacstar 9429A.H manufactured by Dainippon Ink and Chemicals, Inc., solid content: 30% by weight) as a thickener. The mixture was mixed in the proportion shown in to prepare a primer for a waterproof sheet.

[0050]

[Table 2]

Examples 8 to 17 As a resin sheet, a vulcanized rubber waterproof sheet made of ethylene-propylene-diene terpolymer (a band sheet manufactured by Bando Kagaku KK, width 40 mm x length 200 mm)
X thickness 1.2 mm) was used.

On one surface of the vulcanized rubber waterproof sheet, the undercoating agent I, the undercoating agent II obtained in Production Examples 1 or 2 or the chloroprene rubber as an organic solvent-based undercoating agent III (Vanply Co., Ltd. Bumply Co., Ltd.) was used. 80- ^N , solid content 25% by weight, solvent toluene) was applied by using a roll coater to adjust the thickness of the undercoat layer after drying to 30 μm.
It was heated to 80 ° C. and dried to obtain a waterproof sheet having an undercoat layer.

Next, a slate plate (width 40 mm × length 2)
The adhesives A to G obtained in Examples 1 to 7 were applied on one side (00 mm × thickness 1.2 mm) at a basis weight of 300 g / m ² and left as it was for about 30 minutes at a temperature of 28 ° C. under a slight breeze. After that, the adhesion surface of the adhesive and the undercoat layer surface of the waterproof sheet are overlapped and pressed by a pressing roller, and the width is 2
A test piece was obtained by cutting it to 5 mm.

The obtained test pieces were used to examine the adhesive strength according to the following method. Table 3 shows the results.

(A) Initial adhesive strength After the obtained test piece is aged for 1 hour, the force when peeling the waterproof sheet at a peeling angle of 180 °, a peeling speed of 200 mm / min, and a measuring temperature of 25 ° C ( (N / 25 mm width) was measured using an autograph.

(B) Normal adhesive strength The obtained test piece was aged for 1 week and then measured in the same manner as in (a) above. (C) Water-resistant adhesive strength The obtained test piece was immersed 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 left in an oven at 80 ° C. for 2 weeks, cooled to room temperature, and then measured in the same manner as in (a) above.

Example 18 A test piece was prepared in the same manner as in Example 12 except that the waterproof sheet to which the undercoating agent was not applied was used.

As the physical properties of the obtained test piece, the adhesive strength was examined in the same manner as above. Table 3 shows the results.

Example 19 In Example 11, polyvinyl methyl ether (Lutto manufactured by BASF) was used as a heat-sensing agent in the adhesive for waterproof sheet.
aqueous solution of nal M40, resin solid content: 15% by weight)
A test piece was prepared in the same manner as in Example 11 except that the one to which 3 parts was added (hereinafter referred to as adhesive H) was used.

As the physical properties of the obtained test piece, the adhesive strength was examined in the same manner as described above. Table 3 shows the results.

Comparative Example 1 In Example 10, as a waterproof sheet adhesive, a chloroprene rubber organic solvent-based adhesive (B manufactured by Bando Kako Co., Ltd.)
A test piece was prepared in the same manner as in Example 10, except that -75, solid content 26% by weight, solvent toluene, hereinafter referred to as adhesive X) was used.

As the physical properties of the obtained test piece, the adhesive strength was examined in the same manner as described above. Table 3 shows the results.

[0064]

[Table 3]

Example 11 and Example 1 shown in Table 3
From the results of No. 6, when the undercoating agent for a waterproof sheet and the adhesive for a waterproof sheet are of the same kind (Example 11), the adhesive strength is larger than that of the other case (Example 16). I understand.

From the results of Examples 8 to 12, the solid content of the tackifier is 100% of the rubber latex.
When the amount is 30 to 70 parts with respect to the parts (Examples 9 to 1)
It can be seen that 1), in particular, has excellent adhesive strength.

Examples 20 to 21 Polychloroprene latex as a rubber latex (Neoprene latex 40 manufactured by Showa Denko DuPont Co., Ltd.)
0, solid content: 58% by weight), modified rosin ester (super ester E730-55 manufactured by Arakawa Chemical Industry Co., Ltd.) as a tackifier, acrylic acid ester emulsion polymerization resin emulsion (Dai Nippon Ink Chemical Co., Ltd.) as a thickener. Industrial Co., Ltd. Lacstar 9429 AH, solid content: 30% by weight, and a 15% aqueous solution of polyvinyl methyl ether (Lutonal M ₄₀ manufactured by BASF) as a heat-sensing agent are mixed at the ratio shown in Table 4 for a waterproof sheet. An adhesive was prepared.

As the resin sheet, a vulcanized rubber waterproof sheet made of ethylene-propylene-diene terpolymer (Bando sheet manufactured by Bando Kagaku KK, width 400 mm x length 20 mm x thickness 1.2 mm) was used.

On one surface of the vulcanized rubber waterproof sheet, the undercoating agent I obtained in Production Example 1 was applied using a roll coater by adjusting so that the thickness of the undercoating layer after drying was 30 μm. It was heated to 80 ° C. and dried to obtain a waterproof sheet having an undercoat layer.

Next, a slate plate (width 40 mm × length 2)
(0 mm × thickness 1.2 mm), the waterproof sheet adhesive obtained above was applied at a basis weight of 300 g / m ^{2 on} one side, and a dry breeze was carried out in an atmosphere at a temperature of 25 ° C. as shown in Table 4. After being left as it was under the condition of (3), the adhesive surface and the undercoat layer surface of the waterproof sheet were overlapped and pressed by a pressing roller, and then cut into a width of 25 mm to obtain a test piece.

Using the test pieces thus obtained, the adhesive strength was examined in the same manner as in Examples 8 to 17. The results are shown in Table 4.

[0072]

[Table 4]

From the results shown in Table 4, as in Example 21, when the heat-sensitizing agent was blended, a short drying time was obtained after applying the waterproof sheet adhesive to the cementitious base material. However, it can be seen that the waterproof sheet can be firmly adhered to the coated surface of the adhesive.

[0074]

The adhesive for a waterproof sheet of the present invention is not applied to both the waterproof sheet and the cementitious base material when the waterproof sheet is bonded to the cementitious base material, and is applied to the cementitious base material side. Since the waterproof sheet can be firmly adhered to the cementitious base material only by using it, the amount of the adhesive used can be significantly reduced as compared with the conventional case. Further, since the organic solvent is not used in the method of applying the waterproof sheet of the present invention, safety against fire,
This is an excellent method for human safety and environmental hygiene.

The method of applying the waterproof sheet of the present invention is as follows.
Since it can be firmly adhered to the cementitious base material and the adhesive layer has excellent water resistance, it can be suitably applied when waterproofing construction such as a building.

Claims (12)

[Claims] 1. A waterproof sheet adhesive comprising rubber latex and a tackifier as main components. 2. The adhesive for a waterproof sheet according to claim 1, wherein the rubber latex is polychloroprene latex. 3. The adhesive for a waterproof sheet according to claim 1, wherein the tackifier is rosin, a rosin derivative or an aromatic petroleum resin. 4. The adhesive for a waterproof sheet according to claim 1, wherein the amount of the tackifier is 30 to 80 parts by weight based on 100 parts by weight of the solid content of the rubber latex. 5. A heat-sensitizing agent is contained in claim 1, 2.
The adhesive for a waterproof sheet according to 3 or 4. 6. A method of constructing a waterproof sheet, comprising applying a waterproof sheet adhesive containing rubber latex and a tackifier as main components to a cementitious base material, and then bonding the waterproof sheet. 7. The method for applying a waterproof sheet according to claim 6, wherein the rubber latex is polychloroprene latex. 8. The method for applying a waterproof sheet according to claim 6, wherein the tackifier is rosin, a rosin derivative or an aromatic petroleum resin. 9. The method for applying a waterproof sheet according to claim 6, wherein the amount of the tackifier is 30 to 80 parts by weight with respect to 100 parts by weight of the solid content of the rubber latex. 10. The method for applying a waterproof sheet according to claim 6, 7, 8 or 9, wherein the waterproof sheet adhesive contains a heat-sensitive agent. 11. The waterproof sheet is ethylene-propylene-
The method for applying a waterproof sheet according to claim 6, which is a vulcanized rubber sheet containing a diene terpolymer as a main component. 12. The waterproof sheet has an undercoat layer containing polychloroprene as a main component on one surface thereof.
The method for applying the waterproof sheet according to 9, 10, or 11.