JP5411024B2 - Waterproof material and waterproof layer repair method - Google Patents

Description

  The present invention relates to a waterproof material for a building and a method for repairing a waterproof layer.

In recent years, water-based coating materials have been required for waterproofing materials for outdoor buildings in consideration of environmental aspects.
The aqueous coating material is generally set to have a low glass transition temperature (hereinafter referred to as Tg) of an emulsion constituting the coating material in order to elongate at a low temperature.

  However, when the Tg is lowered, the coating material becomes sticky and the stain resistance is not satisfied. The coating film formed by applying a coating material for outdoor buildings is required to have the above-mentioned anti-contamination property to prevent adhesion and fixation of contaminants to the coating film. Such a low Tg is required. When using a coating material, a top coat is required. Furthermore, a primer is also required to satisfy the adhesive strength.

  There exists a coating material composition of patent document 1 as what solves such a problem.

JP 2009-249414 A

In the waterproof material of Patent Document 1, the Tg of the emulsion is set high in order to obtain contamination resistance. Furthermore, since the elongation of the paint is insufficient, a high boiling point solvent is added to impart plasticity.
However, it became clear by the present inventors that the coating film itself becomes soft when a high-boiling solvent is added to the waterproof material, but the heat stretchability deteriorates. Such a waterproof material is not suitable for repairing a waterproof layer made of a vinyl chloride sheet, and the vinyl chloride sheet breaks due to stress due to expansion and contraction.

  The present invention has been made in view of the above circumstances, and has a waterproof material that is excellent in stain resistance and weather resistance, has high adhesion, does not require a primer and a top coat, and is waterproofed by the waterproof material. The purpose is to provide a method for renovating the strata.

(1) The waterproof material of the present invention comprises a core-shell emulsion having a Tg of −40 ° C. to −20 ° C. and an extender pigment having an oil absorption of 10 to 40 mg / 100 g.
(2) The waterproof material of the present invention preferably contains 40 to 70% by mass of the emulsion and 10 to 40% by mass of the extender pigment.
(3) In the waterproof material of the present invention, the extender pigment preferably has an average particle diameter of 2 to 20 μm.
(4) The waterproof layer repair method of the present invention is characterized in that the waterproof material of the present invention is applied to the waterproof layer.
(5) In the waterproof layer repair method of the present invention, the waterproof layer is preferably made of a vinyl chloride sheet.
(6) In the waterproof layer repair method of the present invention, the waterproof layer is preferably made of FRP.
(7) In the waterproof layer refurbishing method of the present invention, the waterproof layer is preferably made of a urethane waterproof material.
(8) In the waterproof layer refurbishing method of the present invention, the waterproof layer is preferably made of a synthetic rubber sheet.

  According to the waterproof material of the present invention, it is excellent in stain resistance and weather resistance, so it does not require a top coat and has high adhesion, so it can be directly applied to various buildings without the need for a primer. Can do.

  According to the waterproof layer refurbishing method of the present invention, it is possible to reduce the construction process because a primer and a top coat are not required, and it is possible to finish with only the intermediate coating material in all construction processes, and the construction management is easy. It will be something. In addition, since the adhesion of the paint is particularly good, the waterproof layer constructed by other materials can be easily modified.

[Core-shell type emulsion]
The waterproof material of the present invention must contain a core-shell emulsion having a Tg (glass transition temperature) of −40 ° C. to −20 ° C. and an extender pigment having an oil absorption of 10 to 40 mg / 100 g.

  It is essential that the Tg of the entire synthetic resin constituting the waterproof material of the present invention is −40 ° C. to −20 ° C. If Tg is less than −40 ° C., sufficient contamination resistance cannot be obtained.

  Moreover, as a synthetic resin which comprises the waterproof material of this invention, it is essential that it is a core-shell type. When the synthetic resin is not a core-shell type, adhesion cannot be obtained at a Tg of -40 ° C to -20 ° C. In the waterproof material of the present invention, it is preferable to select the monomer component constituting the core-shell emulsion composition so that the Tg of the shell part of the core-shell emulsion is lower than the Tg of the core part. By such selection, the adhesion can be maintained without impairing the coating film strength.

  The waterproof material of the present invention preferably contains 40 to 70% by mass of the emulsion, and more preferably 55 to 60% by mass.

  Examples of the core-shell type emulsion include acrylic resin emulsion, acrylic silicon resin emulsion, urethane resin emulsion, fluororesin emulsion, epoxy resin emulsion, polyester resin emulsion, alkyd resin emulsion, melamine resin emulsion, etc., weather resistance, freedom of resin design Acrylic resin emulsions are preferred from the viewpoints of high degree and cost.

  As the acrylic resin emulsion, those obtained by radical copolymerization of an acrylic monomer and a monomer copolymerizable with the acrylic monomer can be used.

The monomer that can be used is not particularly limited, but is a (meth) acrylate monomer, an aromatic hydrocarbon vinyl monomer, a vinyl ester or an allyl compound, a nitrile group-containing vinyl monomer, Examples thereof include an epoxy group-containing vinyl monomer and a hydroxyl group-containing vinyl monomer.
In the present specification, “(meth) acrylate” means one or both of an acrylate having a hydrogen atom bonded to the α-position and a methacrylate having a methyl group bonded to the α-position.

  (Meth) acrylate monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert-butyl (meth) acrylate, benzyl (meth) ) Acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, stearyl (meth) acrylate, isobornyl (meth) acrylate, and the like. .

Examples of the aromatic hydrocarbon vinyl monomer include styrene, α-methylstyrene, chlorostyrene, 4-hydroxystyrene, vinyltoluene and the like.
Examples of vinyl esters and allyl compounds include vinyl acetate, vinyl propionate, and diallyl phthalate.
Examples of the nitrile group-containing vinyl monomer include (meth) acrylonitrile.
Examples of the epoxy group-containing vinyl monomer include glycidyl (meth) acrylate.
Examples of the hydroxyl group-containing vinyl monomer include 2-hydroxypropyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl vinyl ether, hydroxystyrene, Aronics 5700 (manufactured by Toagosei Co., Ltd.), and plaqueFA-1. , PlaccelFA-4, placcelFM-1, placcelFM-4 (manufactured by Daicel Chemical Co., Ltd.), HE-10, HE-20, HP-10, HP-20 (manufactured by Nippon Shokubai Co., Ltd.), BLEMMER PEP series, BLEMMER NKH -5050, BLEMMER GLM (manufactured by Nippon Oil & Fats Co., Ltd.), hydroxyl group-containing vinyl-based modified hydroxyalkyl vinyl monomers, and the like.
As other monomers, compounds such as AS-6, AN-6, AA-6, AB-6, AK-5, etc., which are macromonomers manufactured by Toagosei Co., Ltd., vinyl methyl ether, propylene, butadiene, etc. Is mentioned.

Moreover, you may use the vinyl-type monomer which has the hydrophilic property which can improve stability of an emulsion.
Examples of the vinyl monomer include sodium styrenesulfonate, sodium 2-sulfoethyl methacrylate, 2-sulfoethyl methacrylate ammonium, and vinyl monomers having a polyoxyalkylene chain.
Examples of the vinyl monomer having a polyoxyalkylene chain include (meth) acrylic acid esters having a polyoxyalkylene chain.

  As the (meth) acrylic acid ester having a polyoxyalkylene chain, Nippon Oil & Fats Co., Ltd. Bremer PE-90, PE-200, PE-350, AE-90, AE-200, AE-350, PP-500, PP- 800, PP-1000, AP-400, AP-550, AP-800, 700PEP-350B, 10PEP-550B, 55PET-400, 30PET-800, 55PET-800, 30PPT-800, 50PPT-800, 70PPT-800, PME-100, PME-200, PME-400, PME-1000, PME-4000, AME-400, 50POEP-800B, 50AOEP-800B, AEP, AET, APT, PLE, ALE, PSE, ASE, PKE, AKE, PNE, ANE, PNP, AN PNEP-600, Kyoeisha Chemical Co., Ltd. light ester 130MA, 041MA, MTG, light acrylate EC-A, MTG-A, 130A, DPM-A, P-200A, NP-4EA, NP-8EA, EHDG-A, Japan Emulsifier MA-30, MA-50, MA-100, MA-150, RMA-1120, RMA-564, RMA-568, RMA-506, MPG130-MA, Antox MS-60, MPG-130MA, RMA- 150M, RMA-300M, RMA-450M, RA-1020, RA-1120, RA-1820, Shin-Nakamura Chemical Co., Ltd. NK-ESTER M-20G, M-40G, M-90G, M-230G, AMP-10G , AMP-20G, AMP-60G, AM-90G, LA, Elemi manufactured by Sanyo Chemical Lumpur RS-30, and the like.

  Even if a monomer having two or more polymerizable unsaturated bonds such as polyethylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, triallyl cyanurate, allyl (meth) acrylate, divinylbenzene is used. Good. In this case, the generated particles have a structure having cross-linking, and the water resistance of the formed coating film is improved.

  In addition, trifluoro (meth) acrylate, pentafluoro (meth) acrylate, perfluorocyclohexyl (meth) acrylate, 2,2,3,3-tetrafluoropropyl (meth) acrylate, β- (perfluorooctyl) ethyl (meth) ) A fluorine-containing vinyl monomer such as acrylate may be used. As a result, a fluorine-containing acrylic resin emulsion having a high degree of water and oil repellency can be produced.

  Moreover, you may use a carbonyl group containing vinyl-type monomer for the said monomer. Thereby, a crosslinked acrylic resin emulsion in which a compound containing hydrazine and / or a hydrazide group is blended can be produced.

  The acrylic resin emulsion can be obtained by adopting an ordinary synthesis method. In consideration of reducing the particle size and stability of the emulsion and further reducing the content of the organic solvent in the coating composition, the emulsion polymerization method can be used. preferable.

  The emulsion polymerization method is not particularly limited, and can be appropriately selected from various emulsion polymerization methods such as a batch polymerization method, a monomer dropping polymerization method, and an emulsion monomer dropping polymerization method.

  In emulsion polymerization, commonly used ionic or nonionic surfactants can be used.

  Examples of the ionic surfactant include an anionic surfactant having a polyoxyethylene chain, a sulfonate, and an ammonium salt.

  Examples of the anionic surfactant having a polyoxyethylene chain include polyoxyethylene nonylphenyl ether sulfate, polyoxyethylene allyl ether sulfate, octylphenoxyethoxyethyl sulfonate, polyoxyethylene tridecyl ether sulfate and the like.

Examples of the sulfonate include sodium lauryl sulfonate, sodium dodecyl benzene sulfonate, and sodium isooctyl benzene sulfonate.
Examples of the ammonium salt include imidazoline laurate and ammonium hydroxide.

  Examples of the nonionic surfactant include polyethylene glycol nonylphenyl ether; polyoxyethylenes such as polyoxyethylene nonylphenyl ether and polyoxyethylene lauryl ether; L-77, L-720, L-5410, Examples thereof include nonionic surfactants containing silicone such as L-7602 and L-7607 (manufactured by Union Carbide).

  In the present invention, it is preferable to use a reactive surfactant having a polymerizable double bond in one molecule as the surfactant in terms of water resistance and weather resistance. In particular, when a reactive surfactant having a polyoxyalkylene group in the molecule is used, the mechanical stability can be improved.

  The resin solid content concentration in the acrylic resin emulsion is preferably 20 to 70% by weight, and more preferably 30 to 60% by weight. 50 to 55% by weight is particularly preferred.

  The acrylic resin emulsion is not particularly limited as long as the total Tg (glass transition temperature) is −40 ° C. to −20 ° C., DIC's Boncoat, Watersol, Nippon Shokubai Co., Ltd. Molecol Polysol, Nippon SC Co., Ltd. Yodosol, Kanebinol, Asahi Kasei Kogyo Polytron, Polydurex, Chuo Rika Kogyo Rikabond, Nippon Acrylic Primal, BASF Japan Acronal, Clariant Polymer Movinyl, Kaneka Examples include Zemlack and Kanebirak.

[External pigment]
In the waterproof material of the present invention, since a core-shell type emulsion having a Tg of −40 ° C. to −20 ° C. is used, an extender pigment is added for the purpose of increasing the tensile strength. It is also necessary to secure growth.

  Therefore, it is essential that the waterproof material of the present invention contains an extender having an oil absorption of 10 to 40 mg / 100 g.

The oil absorption of the extender pigment is essentially 10 to 40 mg / 100 g, preferably 10 to 40 mg / 100 g, and more preferably 22 to 27 mg / 100 g. When the oil absorption is 10 to 40 mg / 100 g, the strength of the coating material is sufficiently ensured. When the average particle size is 10 mg / 100 g or more, the average particle size of the extender pigment is not excessive, and a smooth coating film can be maintained. When the average particle size is 40 mg / 100 g or less, the viscosity does not increase excessively and the coating property is improved. Maintained.
In addition, the oil absorption amount of the extender pigment in the present invention is determined by measuring by the oil method in accordance with the JIS K5101 standard.

  The waterproof material of the present invention preferably contains 10 to 40% by mass of the extender pigment, more preferably 25 to 30% by mass, and particularly preferably 25 to 28% by mass.

  The average particle diameter of the extender pigment is preferably one that satisfies the above oil absorption range, more preferably 2 to 20 μm, and particularly preferably 3 to 10 μm.

  Examples of extender pigments used in the waterproof material of the present invention include clay (such as kaolin), talc, aluminum silicate, calcium carbonate, aluminum oxide, mica, barium sulfate and silica, and calcium carbonate is preferred.

[Coloring pigments]
The waterproof material of the present invention may contain a color pigment.
Examples of coloring pigments include white pigments such as titanium dioxide; black pigments such as carbon black, acetylene black, lamp black, bone black, graphite, iron black, and aniline black; yellow iron oxide, titanium yellow, monoazo yellow, and condensation. Yellow pigments such as azo yellow, azomethine yellow, bismuth vanadate, benzimidazolone, isoindolinone, isoindoline, quinophthalone, benzidine yellow, permanent yellow; orange pigments such as permanent orange; red iron oxide, naphthol AS azo red, ansan Red pigments such as throne, anthraquinonyl red, perylene maroon, quinacridone red pigment, diketopyrrolopyrrole, watching red, permanent red; cobalt purple, quinacridone violet, dioxa Violet pigments such as emissions Violet; cobalt blue, phthalocyanine blue, blue pigments such as vat blue; etc. green pigments such as phthalocyanine green and the like.
Examples of glitter pigments include metallic pigments such as aluminum powder, bronze powder, copper powder, tin powder, iron phosphide and zinc powder; pearlescent pigments such as metal oxide-coated mica powder and mica-like iron oxide Can be mentioned.

  These color pigments and glitter pigments can be used alone or in any combination of two or more.

  In this invention, it is preferable to contain 2-20 mass% as a using ratio of the said color pigment, and it is especially preferable to contain 5-10 mass%.

[High boiling point solvent]
In the present invention, a high boiling point solvent may be added as a plastic component.
Examples of the high boiling point solvent include 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, ethylene glycol monopropyl ether, polyether polyol, ethylene glycol, diethylene glycol monobutyl ether, and dipropylene glycol normal butyl ether. , Propylene glycol monomethyl ether acetate, propylene glycol monoester and the like, and those having a boiling point of 200 ° C. or higher are preferable, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, ethylene glycol, diethylene glycol monobutyl ether Dipropylene glycol normal butyl ether is more preferable, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate is particularly preferable
Such a high-boiling solvent may be used from the viewpoint of imparting plasticity to the waterproof material, but should not be used from the viewpoint of heating and stretching.

[Defoaming agent]
In the present invention, it is preferable to contain an antifoaming agent for the purpose of, for example, finishing the formed coating film and suppressing or breaking bubbles generated in the paint production stage.
In the present invention, examples of the antifoaming agent include hydrophobic silica or an aliphatic amide antifoaming agent, and an aliphatic amide antifoaming agent is preferable.

  Hydrophobic silica is obtained by organically modifying silica. For example, organohalosilane, dimethylsiloxane, hexamethyldisilazane, dimethyldichlorosilane, trisilane are added to silanol groups on the surface of mineral-derived or synthetic silica fine particles. Compound obtained by reaction bonding of methoxyoctylsilane, trimethylsilane, etc .; silica fine particles and dimethylpolysiloxane or dimethylhydropolyene polysiloxane having a hydroxyl group at the end are mixed and heat-treated at 200 to 300 ° C. to produce silica Compounds obtained by bonding alkylpolysiloxane to the surface of the fine particles; compounds obtained by vapor-phase adsorbing silicone oil on the surface of the silica fine particles, and the like. These may be used alone or in combination of two or more. it can.

  In this invention, it is preferable that the said antifoamer exists in the range of 0.01-5 mass%, and it is more preferable that it exists in the range of 0.1-1.0 mass%.

[Viscosity modifier]
Moreover, in this invention, it is preferable that a viscosity modifier is included from viewpoints, such as coating workability | operativity and pigment sedimentation prevention.

  Examples of the viscosity modifier include inorganic compounds such as water-soluble alkali silicate, montmorillonite and colloidal alumina; fibrin derivative compounds such as methyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose; pluronic polyether, polyether dialkyl ester and polyether Polyether compounds such as dialkyl ether, polyether urethane modified products, polyether epoxy modified products; polyacrylic acid compounds such as polyacrylic acid soda and polyacrylic acid (meth) acrylic acid ester copolymers; polyvinylpyrrolidone, polyvinyl Polyvinyl compounds such as alcohol and polyvinylbenzyl alcohol copolymer; protein derivatives such as sodium caseinate and ammonium caseinate; vinyl methyl ether-maleic anhydride Partial esters copolymer, drying oil fatty allyl alcohol ester - half ester-maleic anhydride copolymers such as such as the reaction product of maleic acid. Anhydride, which may be used singly or in combination of two or more.

  The amount of the viscosity modifier used is preferably in the range of 0.1 to 5% by mass, and more preferably in the range of 0.2 to 1.5% by mass.

[Dispersant]
Moreover, in this invention, it is preferable that a dispersing agent is included.
As the usage-amount of the said dispersing agent, it is preferable to exist in the range of 0.1-5 mass%, and it is more preferable to exist in the range of 0.5-1.5 mass%.

[Alcohol solvent]
Examples of the organic solvent that can be blended in the waterproof material of the present invention include esters, ethers, ketones, alcohols, and the like, with alcohols being preferred.

  Esters include ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol diacetate, ethyl acetate, butyl acetate. 2,2,4-trimethylpentadiol-1,3-monoisobutyrate (manufactured by Chisso Corporation, CS-12), and the ethers include ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, diethylene glycol dimethyl Ether, diethylene glycol dibutyl ether, dipropylene glycol di Chill ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, ethyl ether, butyl ether, dioxane Examples of ketones include acetone and methyl ethyl ketone, and examples of alcohols include methanol, ethanol, n-propanol, isopropanol, butanol, octanol, ethylene glycol, propylene glycol, and benzyl alcohol.

  These organic solvents may be used alone or in combination of two or more. The amount of the organic solvent used is preferably in the range of 0.1 to 5% by mass, and more preferably in the range of 1 to 2% by mass.

[Others]
The waterproofing material of the present invention is, as necessary, a curing catalyst, a fragrance, a deodorant, an antibacterial agent, a neutralizing agent, a surfactant, an aqueous water repellent, an antiseptic, an antifungal agent, an antifreezing agent, and an ultraviolet absorber. Additives for paints such as an agent and a light stabilizer can be contained.

[Construction method]
The material to which the waterproof material of the present invention can be applied is not particularly limited. Specifically, mortar, concrete, ALC (lightweight cellular concrete), urethane, acrylic urethane, vinyl chloride, FRP And various plastics including, synthetic rubber, roofing with sand, and the like.

  Since the waterproof material of the present invention is excellent in adhesiveness, as a construction method using the waterproof material of the present invention, the method of constructing the waterproof material without a primer on the material, For example, a method of directly applying the waterproof material without a primer on a material or an existing coating film may be used.

  As the finish coating material constituting the existing coating film, a single layer elastic coating material, synthetic resin emulsion paint, urethane resin paint, acrylic resin enamel paint, vinyl chloride resin paint, spray tile, resin lysine paint, and other publicly known There are various organic paints, and inorganic paints such as cement lysine, cement stucco, and siliceous.

  Moreover, since the waterproof material of this invention is excellent in weather resistance, the construction method using the waterproof material of this invention includes the method of constructing the said waterproof material without a top coat. Furthermore, by using a white coating film made of titanium dioxide or the like contained in the waterproof material, a heat shielding effect of the building on which the waterproof material of the present invention is applied is obtained, and thermal deterioration of the building and the coating film is prevented. be able to.

  Examples of the application method include known methods using brushes, roller brushes, air sprays, airless sprays, and the like. In the present invention, since a paint having excellent adhesion is used, when applying to a raw material or an existing coating film, it is not necessary to perform sealer or primer treatment, and it can be applied directly.

The coating amount is preferably changed as appropriate according to the solid content concentration and density of the paint, the type and use of the material, the existing coating film or the intermediate coating material layer, the presence or absence of a pattern, and the like. Usually, in order to form a coating film having a uniform thickness, the coating viscosity is 80 to 120 KU, and the coating amount is 0.8 to 2.0 kg / m ² divided into several times.

  Since the construction method using the waterproof material of the present invention has the above-mentioned characteristics, it is suitable for the waterproof layer repair method.

[Repair method of waterproofing layer of vinyl chloride sheet]
The waterproof layer repair method of the present invention is a method in which the waterproof material of the present invention is directly applied to the surface of a waterproof layer made of a vinyl chloride sheet (hereinafter, vinyl chloride sheet waterproof layer).

The vinyl chloride sheet waterproofing layer is constructed by applying a vinyl chloride resin roofing sheet by an adhesive method, an insulation method or a heat insulation method.
As a method of repairing a waterproofing layer of a vinyl chloride sheet that has deteriorated over time due to rainwater, wind, solar radiation, etc., a new method of constructing a vinyl chloride sheet on an existing waterproofing layer, or a new chloride after removing a deteriorated vinyl chloride sheet The method of constructing a vinyl sheet is mentioned.
In the method of newly constructing a vinyl chloride sheet on the existing waterproof layer, there is a difficulty in considering the swelling generated between the new waterproof layer and the existing waterproof layer.
In the method of constructing a new vinyl chloride sheet after removing the deteriorated vinyl chloride sheet, it is necessary to perform surface treatment such as smoothing the surface to be repaired with polymer cement or polymer mortar after removal. Requires skill.
Furthermore, when construction is performed using an adhesive, the odor of the adhesive is a problem from the environmental aspect.

In addition, as another repair method, there is a repair method in which a urethane coating waterproof material is applied to a waterproof layer for construction. In the repair method, since the adhesiveness between the urethane coating film waterproof material and the vinyl chloride sheet is poor, it is necessary to use a primer having excellent adhesiveness with the vinyl chloride sheet.
In addition, the vinyl chloride sheet used for the waterproof layer is often constructed by floating tension, and excessive stress is applied to the vinyl chloride sheet due to shrinkage due to aging deterioration of the urethane coating waterproofing and heating during liquid super fast curing urethane application. There is a problem that the vinyl chloride sheet tends to swell and break after construction.

The waterproof layer refurbishing method of the present invention is a method in which the waterproof material of the present invention is directly applied to the surface of the vinyl chloride sheet waterproof layer and then applied to newly install the waterproof layer.
The waterproof material of the present invention is excellent in adhesion, weather resistance, and heat stretchability. Therefore, according to the waterproof layer refurbishing method of the present invention, it is not necessary to apply a primer before the application waterproofing material is applied. Moreover, a top coat is unnecessary, and physical stress does not arise in a vinyl chloride sheet after construction.
Furthermore, since the waterproof material of the present invention is water-based, there is no possibility of deteriorating the vinyl chloride sheet.

[FRP waterproofing layer repair method]
The waterproof layer repair method of the present invention is a method in which the waterproof material of the present invention is directly applied to the surface of a waterproof layer made of FRP (hereinafter referred to as FRP waterproof layer).

FRP waterproofing construction is a method for obtaining a waterproof coating by impregnating an unsaturated polyester resin, vinyl ester resin or urethane (meth) acrylate resin into a reinforcing material such as a glass mat or organic fiber and curing it.
In recent years, the FRP waterproofing construction has been applied to the rooftops, verandas, and the like of buildings. When the FRP waterproof layer applied to such a building deteriorates with age, it is common to newly apply FRP on the existing FRP waterproof layer.
However, since FRP waterproofing construction is a construction method having the above-described configuration, the construction method has problems such as odor, trouble of mixing and stirring, and poor curing, and further requires skill in the work.
Since the waterproof material of the present invention is a one-pack type aqueous coating material and can be applied by a roller brush, all the above problems can be solved by the method for repairing the FRP waterproof layer of the present invention.

Moreover, when using a conventional waterproofing membrane as another modification method, since the FRP waterproofing layer has wax on the surface of the layer, the waterproofing membrane cannot be adhered to the waterproofing layer surface.
As a countermeasure, after applying a primer having excellent adhesion to the surface of the waterproof layer, a method of adhering the waterproof layer of the coating film, or after roughening the surface of the waterproof layer by sanding, The method of making it adhere | attach is mentioned.
However, when an aqueous primer is used in consideration of environmental pollution, the aqueous primer does not sufficiently satisfy adhesiveness. Moreover, when roughening, since glass fiber is scattered, there is a difficulty in construction.

The method for repairing the FRP waterproof layer according to the present invention is a method in which the waterproof material according to the present invention is directly applied to the surface of the FRP waterproof layer and applied, and a waterproof layer is newly provided.
Since the waterproof material of the present invention is excellent in adhesion and weather resistance, according to the method for repairing the FRP waterproof layer of the present invention, the primer is applied before the waterproof coating material is applied and the top after the waterproof coating material is applied. No coating treatment is required. Furthermore, since the waterproof material of the present invention is water-based, it can be safely operated even in renovation in a living environment.

  The method for repairing the FRP waterproof layer of the present invention is not particularly limited, but is used on a rooftop, veranda, balcony, roof or the like where FRP waterproofing is applied.

[Repair method of urethane coating waterproof layer]
The waterproof layer refurbishing method of the present invention is a method in which the waterproof material of the present invention is directly applied to the surface of a waterproof layer made of a urethane coating film waterproof material (hereinafter, urethane coating film waterproof layer).
As described above, the waterproof material of the present invention is excellent in adhesion to an existing urethane coating film. Therefore, according to the repair method of the urethane coating film waterproof layer of the present invention, it is not necessary to apply a primer before construction of the coating film waterproof material.

[Repair method of waterproofing layer of synthetic rubber sheet]
The waterproof layer repair method of the present invention is a method in which the waterproof material of the present invention is directly applied to the surface of a waterproof layer made of a synthetic rubber sheet (hereinafter referred to as a synthetic rubber sheet waterproof layer).
As described above, the waterproof material of the present invention is excellent in adhesion to synthetic rubber. Therefore, according to the method for repairing the waterproof layer of the synthetic rubber sheet of the present invention, it is not necessary to apply a primer prior to the construction of the waterproof coating material.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited to a following example.

Example 1
Dispersant (Rohm and Haas Co., Ltd .; Primal 850FF) 0.8 parts, titanium dioxide 7.6 parts, calcium carbonate (average particle size 5.4 μm, oil absorption 24 mg / 100 g) 24.3 parts by mass and water 2 parts A dispersion paste was prepared by mixing and dispersing. 54.7 parts of core-shell type emulsion composition (Rohm and Haas, Elastin 2885), 0.5 part of SN deformer as antifoaming agent, 0.3 part of thickener and dispersion paste are mixed and stirred to prepare the coating material. Obtained.

The paint of Example 1 was measured by the following adhesion test method, and the results are shown in Table 1.
(1) Adhesion after standard curing After the coating material of Example 1 was applied to a substrate, it was cured in 23 ° C. and 50% RH for 24 hours, and the adhesion test shown in (3) was performed.
(2) After the adhesion (1) test after the water resistance test, the substrate coated with the paint of Example 1 was immersed in water for 24 hours, taken out, and then cured at 23 ° C. and 50% RH for 24 hours. The adhesion test shown in 3) was performed.
(3) Adhesion test method (conforms to JISK5600-5-6)
A grid pattern of 2 mm width was cut into the coating film formed on the base material by 100 squares by a cutter. A cellophane tape (registered trademark) was affixed on the cut, and the cellotape (registered trademark) was peeled off quickly to confirm how many cells were peeled out of 100 cells. In the table, the number of cells peeled / 100 cells was described.

  As shown in Table 1, the waterproof material of the present invention exhibits excellent adhesion to mortar, concrete, ALC (lightweight cellular concrete), acrylic urethane, vinyl chloride, synthetic rubber, sanding roofing, and further excellent water resistance. Indicated.

(Comparative Example 1)
As Comparative Example 1, Atoleine aqueous top L manufactured by Atomics Co., Ltd. was used.

(Comparative Example 2)
As Comparative Example 2, Aron Coat manufactured by Toa Gosei Co., Ltd. was used.

The paints of Example 1 and Comparative Examples 1 and 2 were measured by the following contamination test method, and the results are shown in Table 2.
(1) Contamination test
The paints of Example 1 and Comparative Examples 1 and 2 were applied with a 30 mil applicator and cured at each temperature for 1 week. Thereafter, carbon paper was placed on the coating film, and a weight of 500 g was placed thereon for 24 hours, and the sticking condition of the carbon paper was visually evaluated according to the following criteria.
○: No sticking △: Sticking is inconspicuous ×: Sticking is conspicuous

  As shown in Table 2, the waterproof material of the present invention obtained in Example 1 showed excellent contamination resistance as compared with Comparative Examples 1 and 2.

(Comparative Example 3)
A paint was obtained in the same manner as in Example 1 except that a resin having a structure having no core and having a Tg of about 20 ° C. (Boncoat YG-609 (manufactured by DIC) Tg 19 ° C.) was used.

(Comparative Example 4)
A paint was obtained in the same manner as in Example 1 except that a resin having a structure without a core and having a Tg of about 0 ° C. (Boncoat 550EF (manufactured by DIC) Tg 0 ° C.) was used.

(Comparative Example 5)
A paint was obtained in the same manner as in Example 1 except that a resin having no core and Tg of about -20 ° C (Acronal YJ-2741D (manufactured by BASF Japan) Tg-14 ° C) was used.

(Comparative Example 6)
A paint was obtained in the same manner as in Example 1 except that a resin having no core and having a Tg of about −40 ° C. or less (Polysol AP-5575 (manufactured by Showa Polymer Co., Ltd.) Tg-60 ° C.) was used. .

The paints of Example 1 and Comparative Examples 3 to 6 were measured by the following test methods, and the results are shown in Table 3.
(1) Coating film strength
The coating film tensile strength was evaluated according to the following criteria.
○: Ratio of −20 ° C. tensile measurement value to 23 ° C. tensile test measurement value is 100% or more and 400% or less, and ratio of 60 ° C. tensile measurement value to 23 ° C. tensile test measurement value is 30% or more Δ: 23 ° C. tensile test The ratio of the −20 ° C. tensile measurement value to the measurement value is 401% or more and 500% or less, and the ratio of the 60 ° C. tensile measurement value to the 23 ° C. tensile test measurement value is 30% or more. X: −20 ° C. to the 23 ° C. tensile test measurement value The ratio of the tensile measurement value is 501% or more, and the ratio of the 60 ° C. tensile measurement value to the 23 ° C. tensile test measurement value is 30% or more.

(2) Coating film elongation rate The coating film tensile elongation rate at -20 ° C was evaluated according to the following criteria.
(Circle): 70% or more (triangle | delta): 60% or more and less than 70% x: Less than 60% (3) Adhesiveness with respect to an adhesive vinyl chloride sheet was evaluated using the adhesion test method mentioned above.
○: The number of cells removed is 10 cells or less / 100 cells Δ: The number of cells removed is 11 cells or more and 30 cells or less / 100 cells ×: The number of cells removed is 31 cells or more / 100 cells (4) Contamination Resistance Table 2 Since it is the same as the description of the test items shown in Fig. 1, it is omitted.

  As shown in Table 3, the waterproof material of the present invention obtained in Example 1 showed excellent contamination resistance as compared with Comparative Example 6 having a low Tg. Furthermore, the waterproof material of the present invention obtained in Example 1 showed excellent coating strength and adhesion as compared with Comparative Example 5 having a high Tg.

(Example 2)
A paint was obtained in the same manner as in Example 1 except that 30.3 parts by mass of calcium carbonate (average particle size 5.4 μm, oil absorption 24 mg / 100 g) was used.

(Comparative Example 7)
A coating material was obtained in the same manner as in Example 2, except that 2 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate was used.

The paints of Examples 1 and 2 and Comparative Example 7 were measured by the following test methods, and the results are shown in Table 4.
(1) Heat stretchability test In accordance with JIS A6021, the length of the resin was measured with a length measuring instrument after heating at 80 ° C. for 168 hours, and the stretch ratio relative to the length of the resin before the heat treatment was calculated.

  As shown in Table 4, since the waterproofing material of the present invention obtained in Example 1 and Example 2 excludes the high boiling point solvent, the stretch rate after heating has a JIS A 6021 coating waterproofing material for building waterproof acrylic rubber system It was within the standard range.

(Comparative Example 8)
A paint was obtained in the same manner as in Comparative Example 7, except that 1 part of an aliphatic amino acid and 1 part of polysiloxane were used as an antifoaming agent.

The paints of Examples 1-2 and Comparative Examples 7-8 were measured by the test methods shown below, and the results are shown in Table 5.
(1) The container containing the thickening test paint is cured at 55 ° C. for 14 days. Thereafter, the viscosity was measured.

  As shown in Table 5, the waterproofing material of the present invention obtained in Example 1 and Example 2 containing an antifoaming aliphatic amide system did not thicken. On the other hand, in Comparative Example 8 containing an antifoaming polysiloxane, the viscosity was increased.

(Comparative Example 9)
A paint was obtained in the same manner as in Comparative Example 8, except that 30.3 parts by mass of calcium carbonate (average particle size 1.0 μm, oil absorption 27 mg / 100 g) was used.

The paints of Examples 1 and 2 and Comparative Example 9 were measured by the following test methods, and the results are shown in Table 6.
(1) Tensile performance test after alkali treatment According to JIS A6021 architectural waterproofing membrane waterproof acrylic rubber for roof, after alkali treatment, the tensile strength of the resin is measured with a tensile tester, and the tensile strength of tensile performance The average value of the ratio (percentage) to the thickness is shown.

  As shown in Table 6, the waterproofing material of the present invention obtained in Example 1 and Example 2 containing calcium carbonate (average particle size 5.4 μm, oil absorption 24 mg / 100 g) has a tensile strength ratio after alkali treatment. However, it was within the standard range of acrylic rubber-based roofing paint waterproofing material for JIS A 6021.

Claims (8)

  A waterproofing material comprising a core-shell emulsion having a Tg of -40 ° C to -20 ° C and an extender pigment having an oil absorption of 10 to 40 mg / 100 g.   The waterproofing material according to claim 1, comprising 40 to 70% by mass of the emulsion and 10 to 40% by mass of the extender pigment.   The waterproof material according to claim 1 or 2, wherein the extender has an average particle diameter of 2 to 20 µm.   A waterproof layer refurbishing method comprising applying the waterproof material according to claim 1 to the waterproof layer.   The method for repairing a waterproof layer according to claim 4, wherein the waterproof layer is made of a vinyl chloride sheet.   The method for repairing a waterproof layer according to claim 4, wherein the waterproof layer is made of FRP.   The method for repairing a waterproof layer according to claim 4, wherein the waterproof layer is made of a urethane coating waterproof material.   The method for repairing a waterproof layer according to claim 4, wherein the waterproof layer is made of a synthetic rubber sheet.