JP2002364128A - Urethane-based paint film waterproofing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a urethane paint film waterproofing method restrained emit odor in construction, having drying property, hardening property, adhesive property, mechanical property and weatherability almost equivalent to a paint film system of a conventional solvent system. SOLUTION: In this waterproofing method, (a) water primer, (b) a non-solvent type urethane paint film waterproofer containing a plasticizer at 5 mass% or more to the whole quantity of the paint film waterproofer, and (c) water topcoat are applied in this order to the surface of a building skeleton. The plasticizer is one or more kinds selected from phthalic ester-based, aliphatic dibasic acid ester-based, phosphoric ester-based, epoxy fatty acid ester-based, glycol ester-based, chlorinated paraffin-based, and petroleum-based plasticizers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a urethane-based waterproofing method suitable for all waterproofing applications, such as a rooftop having a large area in a building, a veranda close to a living environment, a balcony, and an open corridor.

[0002]

2. Description of the Related Art Conventionally, a urethane-based coating waterproofing method applied to waterproofing of a building includes, as a primer, an isocyanate-terminated prepolymer obtained by a reaction between polyoxypropylene polyether polyol and tolylene diisocyanate. One-pack solvent urethane-based primer consisting of a solution having a viscosity of 10 to 100 mPa · s (20 ° C.) diluted by adding a solvent such as xylene, toluene or ethyl acetate at 40 to 80% by mass, or a bisphenol A type epoxy resin A two-component solvent-based epoxy primer comprising a main agent comprising a solution and a curing agent comprising an aliphatic polyamine solution is used.

[0003] As a waterproofing material applied on the primer layer, a main component mainly composed of an isocyanate group-terminated polyurethane prepolymer obtained by a reaction between polyoxypropylene polyol and tolylene diisocyanate; And 4,
A two-part urethane coating waterproofing material that cures at room temperature and is composed of a curing agent containing 4'-methylenebis (2-chloroaniline) as a main component is used.

[0004] Since 4,4'-methylenebis (2-chloroaniline) contained in the above curing agent is solid at normal temperature, the melt is usually used as a plasticizer such as polyoxypropylene polyol, dioctyl phthalate and butylbenzyl phthalate. It is used after being dissolved in a concentration of 30 to 50% by mass. However, since the viscosity of the solution itself is high, and since the curing agent contains a filler such as calcium carbonate, it is necessary to reduce the viscosity. Therefore, an organic solvent such as xylene is further added in an amount of 1 to 8% by mass. To some extent.

[0005] Further, a top coat is further laminated on the waterproof layer. The top coat may be formed of a solvent such as xylene, toluene, ethylene glycol monoethyl ether acetate or butyl acetate for 30 to 60 hours.
An acrylic urethane-based two-pack type top coat or the like was mainly used.

[0006]

The above-mentioned conventional primer, waterproofing material, and top coat all contain a solvent and generate an odor at the time of construction, so that the contractor or resident needs to pay attention. there were. In addition, when the solvent is frequently used in the waterproof material, the mechanical properties of the cured coating film may become unstable.

Accordingly, an object of the present invention is to provide a urethane-based coating which is less likely to emit an odor at the time of construction and which has almost the same dryness, curability, adhesiveness, mechanical properties and weather resistance as a conventional solvent-based coating system. An object of the present invention is to provide a membrane waterproofing method.

[0008]

In order to achieve the above object, the urethane coating waterproofing method according to the present invention comprises: (a) an aqueous primer;
In a waterproofing method in which a solvent-free urethane coating waterproofing material containing 5% by mass or more of a plasticizer relative to the total amount of the coating waterproofing material, and (c) a waterproofing method for sequentially applying an aqueous top coat, the plasticizer is a phthalate ester-based fat. It is characterized by being one or more members selected from the group consisting of dibasic acid esters, phosphate esters, epoxy fatty acid esters, glycol esters, chlorinated paraffins, and petroleum.

According to the present invention, it is possible to provide a urethane-based waterproofing method which is free from odor due to a solvent at the time of construction and is suitable for waterproofing work on a large-area rooftop or a veranda close to a house which is used in large quantities. . In addition, by containing a specific plasticizer in an amount of 5% by mass or more based on the total amount of the waterproof coating material, a waterproof layer having sufficiently low viscosity and good workability without using a solvent, and having excellent appearance of the coated film after curing. Can be formed.

In a preferred embodiment of the present invention, the solvent-free type urethane coating waterproofing material comprises a two-component type comprising a main component having an isocyanate group-terminated prepolymer as a main component and a curing agent having an aromatic polyamine as a main component. It is a waterproofing material, as a more preferred embodiment, the solvent-free urethane coating waterproofing material, the main component isocyanate group-terminated prepolymer obtained by the reaction of polyoxypropylene polyol and tolylene diisocyanate as a main component, diethyl It is a two-pack type waterproof material made of a curing agent containing toluenediamine. According to this aspect, since the composition is cured at room temperature, the workability is good, and the mechanical properties of the obtained cured coating film are excellent.

In another preferred embodiment of the present invention, the solvent-free type urethane coating waterproofing material is a moisture-curable one-pack waterproofing material containing an isocyanate group-terminated prepolymer as a main component. According to this embodiment, the curability at room temperature is sufficiently satisfied, and the obtained coating film has excellent mechanical strength and elongation performance, and further, the amount of carbon dioxide gas generated in the process of moisture curing is reduced, so that the cured coating film Is less likely to foam.

In the above invention, the aqueous primer is preferably one or a mixture of two or more selected from an aqueous epoxy resin primer, an aqueous urethane resin primer, and an aqueous acrylic resin primer. According to this aspect, there is no odor due to the solvent, and excellent in dryness and curability after being applied to the concrete base,
In addition, a primer layer having good adhesion to the base and the urethane coating waterproofing material can be formed.

Further, in the above invention, it is preferable that the top coat is one or more selected from an aqueous acrylic resin-based top coat and a fluoropolymer-based top coat. According to this aspect, it is possible to form a top coat layer which has no odor due to a solvent, has excellent adhesion to a urethane coating waterproofing material having a large amount of a plasticizer, and has good long-term weather resistance.

The urethane coating waterproofing method of the present invention is preferably applied to the construction or repair of all waterproof layers such as a building roof, a veranda, a balcony or an open corridor.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The materials used in the urethane coating waterproofing method of the present invention will be described below. First, the aqueous primer (a) used in the present invention will be described.

The aqueous primer is not particularly limited, and for example, an epoxy resin-based, urethane resin-based, vinyl acetate resin-based, acrylic resin-based, styrene-butadiene rubber-based, and chloroprene rubber-based emulsion-type aqueous primer can be used. One or more selected from epoxy resin, urethane resin, and acrylic resin are preferred from the viewpoint of drying properties and adhesiveness.

The epoxy resin-based emulsion-type aqueous primer includes a main component comprising an emulsion containing a bisphenol A type, a novolak type, a brominated type, an alicyclic type or an aliphatic type epoxy resin as a main component, an aliphatic polyamine, Preferred are those containing two components: a curing agent composed of an emulsion containing an aromatic polyamine, an alicyclic polyamine, or a polyamide. Further, those containing a hydraulic cement component such as Portland cement are also preferable.

The urethane resin-based emulsion-type aqueous primer includes a main agent composed of an emulsion containing a polyol as a main component, a curing agent composed of a liquid MDI such as crude MDI and a modified carbodiimide, and a hydraulic material such as Portland cement and white cement. Those containing a cement component are preferred.

In the present invention, among the above-mentioned aqueous primers, an epoxy resin emulsion type aqueous primer is particularly preferably used. Specifically, a main component comprising a bisphenol A type epoxy resin emulsion, a curing agent comprising an aliphatic polyamine emulsion, and a component comprising three components of Portland cement are particularly preferred. The water-based epoxy resin-based primer has no odor due to a solvent, has excellent dryability and curability after being applied to a concrete base, and has good adhesion to the base and a urethane-based waterproofing material.

In the present invention, one of the above-mentioned aqueous primers may be used alone, two or more aqueous primers may be used as a plurality of layers, and two or more aqueous primers may be used. May be used in combination.

Next, the solventless urethane coating waterproofing material used in the present invention will be described. (B) used in the present invention
The non-solvent type urethane coating waterproofing material refers to a urethane-based coating waterproofing material which does not contain a solvent which is usually added for the purpose of reducing viscosity. That is, in the present invention, the solvent-free type means that when the additive used at the time of compounding contains a small amount of a solvent contained in advance, the content of the solvent in the entire urethane-based waterproofing material including the main agent and the curing agent is 3%. It means that the content is not more than 1% by mass, more preferably not more than 1% by mass, and most preferably not containing.

Examples of such a solventless urethane coating waterproofing material include a main component mainly composed of an isocyanate group-terminated prepolymer obtained by reacting a polyoxypropylene polyol with a polyisocyanate such as tolylene diisocyanate; Hand-painted two-pack waterproofing material that cures at room temperature, consisting of a curing agent mainly composed of aromatic polyamine such as toluenediamine, and one-component urethane coating waterproofing material that cures by reacting with moisture in the air Is particularly preferred.

In the present invention, the water-curable one-pack waterproofing material which is forcibly added with water and hardened is very difficult to mix water, and when applied at a high temperature, pinholes are easily generated. Excess water volatilizes and thins the cured coating,
Since the mechanical properties tend to be unstable and impractical, it is excluded from the solventless urethane coating waterproofing material used in the present invention.

As the two-pack type waterproofing material, the polyisocyanate used as the main component is preferably tolylene diisocyanate in view of the viscosity and curability of the prepolymer. Especially two
Tolylene diisocyanate having a 4-isomer content of 95% by mass or more is particularly preferred.

The active hydrogen compound in the curing agent component is substantially only an aromatic polyamine. The aromatic polyamine is diethyltoluenediamine alone or diethyltoluenediamine, and only one of the ortho positions to each amino group is alkyl. 4,4′-methylenedianiline substituted with a group,
A mixture comprising two or more of 4,4'-methylenedianiline, bismethylthiotoluenediamine, 4,4'-methylenebis (2-chloroaniline), etc., wherein both ortho positions to each amino group are substituted with an alkyl group. Is preferred. As described above, in the present invention, the curing agent component consists essentially of only a polyamine as an active hydrogen compound.
It is possible to use a small amount of a low-reactivity component such as polyoxyalkylene polyols as a plasticizer, but if used in large amounts, the balance between the reactivity with the main component becomes poor and the curability becomes slow, especially The curability at low temperatures becomes extremely poor. However, an amine polyol having 3 to 4 hydroxyl groups obtained by adding an alkylene oxide to an amine compound having relatively high reactivity with isocyanate can also be mixed.

On the other hand, in the case of a one-pack type waterproof material, the polyisocyanate used for the isocyanate-terminated urethane prepolymer as a curing component is 4,4′-
Diphenylmethane diisocyanate is preferred.

Next, in the present invention, a large amount of a plasticizer is added to the urethane component. Accordingly, a low-viscosity urethane-based coating film waterproofing material can be obtained without using a solvent, so that workability during coating is improved.

As the plasticizer, one or two selected from phthalic acid ester type, aliphatic dibasic acid ester type, phosphate ester type, epoxy fatty acid ester type, glycol ester type, chlorinated paraffin type and petroleum type The above plasticizers can be used.Examples of phthalate esters include dioctyl phthalate, dibutyl phthalate, dinonyl phthalate, diisononyl phthalate, butylbenzyl phthalate, and the like. Dioctyl acid can be used. In addition, the said plasticizer may be used independently and may be used in mixture of 2 or more types.

The content of the plasticizer must be 5% by mass or more based on the total amount of the coating composition, and is preferably 1% by mass.
0 mass% or more and 25 mass% or less are preferable. If the amount of the plasticizer is less than 5% by mass, a sufficient viscosity reducing effect cannot be obtained. On the other hand, if the content exceeds 25% by mass, the cured coating film is liable to bleed, and the adhesion of the top coat is undesirably reduced.

The above-mentioned plasticizer can be added to either the main agent or the curing agent. For example, in the case of a hand-painted two-pack type urethane coating waterproofing material, it is necessary to add the plasticizer to the curing agent. Is preferred. By adding a plasticizer to the curing agent, the filler can be more uniformly and efficiently kneaded, and the surface appearance of the cured coating film is significantly improved. The addition amount is preferably 10% by mass or more in the curing agent.
40 mass% is more preferable. On the other hand, the above-mentioned plasticizer can be similarly used for a moisture-curable one-part urethane coating waterproofing material, and the amount of addition is required to be 5% by mass or more, preferably 5 to 25% by mass.

The solvent-free urethane-based coating film waterproofing material of the present invention comprises a filler, a pigment,
It may contain a catalyst, various stabilizers, a surfactant and the like. Especially, it is preferable to contain a filler. Fillers include calcium carbonate, silicic anhydride, hydrous silicic acid, carbon black, magnesium carbonate, magnesium hydroxide, diatomaceous earth, calcined clay, clay, talc, titanium oxide, bentonite, ferric oxide, zinc oxide, active Zinc white, shirasu balloon, glass fiber, and the like. Among them, calcium carbonate is particularly preferred. The amount of the filler used is 10 to 60% by mass in the urethane coating waterproofing material.
Is preferred.

Next, the water-based top coat (c) used in the present invention will be described. The aqueous topcoat in the present invention is not particularly limited, but preferably includes an aqueous acrylic resin-based topcoat, a fluoropolymer-based topcoat, and a mixture thereof. In particular, when long-term weather resistance is required, a fluoropolymer-based topcoat alone or a mixture of an aqueous acrylic resin-based topcoat and a fluoropolymer-based topcoat is preferred. This makes it possible to form a top coat layer having excellent adhesion even with a urethane coating waterproofing material having no odor due to a solvent and having a large amount of a plasticizer.

Examples of the aqueous acrylic resin-based top coat include a one-pack type in which a mixture of a urethane resin and an acrylic resin is emulsified, and a curing agent comprising an emulsion containing an acrylic polyol as a main component having an isocyanate group-terminated prepolymer as a main component. Can be used, but from the viewpoint of film forming properties and mechanical properties of the cured coating film, the two-pack type is more preferable.

Examples of the isocyanate group-terminated prepolymer include polyether polyols such as polyoxypropylene polyol and polyoxytetramethylene diol, polyester polyols such as adipate and lactone, and aromatic rings such as hexamethylene diisocyanate and isophorone diisocyanate. Those obtained by reaction with unreacted polyisocyanates are preferred. in this case,
The base may be diluted with a thickening agent such as propylene glycol monomethyl ether acetate.

As the acrylic polyol, an acrylic monomer such as (meth) acrylic acid or an alkyl (meth) acrylate and an acrylic monomer having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate; Those obtained by polymerizing other ethylenically unsaturated monomers are preferred. In addition, this curing agent is
It may contain pigments, fillers, catalysts, various stabilizers, surfactants and the like.

On the other hand, the fluoropolymer-based topcoat is preferably a topcoat composed of a main component having the same isocyanate group-terminated prepolymer as a main component and a curing agent composed of an emulsion containing a fluorinated polyol. As the fluorinated polyol, those obtained by polymerizing a fluoroolefin and an ethylenically unsaturated monomer having a hydroxyl group, and optionally other ethylenically unsaturated monomers are preferable. As the fluoroolefin, a compound represented by the following chemical formula (1) is preferably exemplified. CF ₂ = CFX (1) (where X is a hydrogen atom, a chlorine atom, a fluorine atom, a perfluoroalkyl group having 1 to 3 carbon atoms or a 1 to 3 carbon atom)
Is a perfluoroalkoxy group. ) Specific examples include tetrafluoroethylene (TFE), chlorotrifluoroethylene (CTFE), hexafluoropropylene, and perfluoropropylvinyl ether.
The fluoroolefin may be used alone,
Two or more kinds may be used as a mixture.

Examples of the ethylenically unsaturated monomer having a hydroxyl group include hydroxyalkyl vinyl ethers such as hydroxybutyl vinyl ether (HBVE) and hydroxyethyl vinyl ether, and hydroxyalkyl (meth) acrylates such as 2-hydroxyethyl (meth) acrylate. Examples thereof include acrylates, hydroxyalkyl allyl ethers such as hydroxyethyl allyl ether, allyl alcohol, and hydroxyalkyl isopropenyl ethers such as hydroxybutyl isopropenyl ether.

On the other hand, other ethylenically unsaturated monomers are not particularly limited, and vinyl esters, vinyl ethers, isopropenyl ethers, allyl ethers, olefins and the like can be used. Vinyl ethers are preferred from the viewpoints of solvent solubility, control of coating film hardness, weather resistance, and alternate copolymerizability and polymerization yield. Specific examples of the vinyl ethers include alkyl vinyl ethers having an alkyl group / cycloalkyl group having about 2 to 8 carbon atoms, such as ethyl vinyl ether (EVE), butyl vinyl ether (BVE), and cyclohexyl vinyl ether (CHVE). And cycloalkyl vinyl ethers.

Examples of the mixture of the aqueous acrylic resin-based top coat and the fluoropolymer-based topcoat include a mere mixture of the above-mentioned aqueous acrylic resin-based topcoat and the fluoropolymer-based topcoat, and the same isocyanate group-terminated terminal coat as described above. Examples include those comprising a main agent mainly composed of a prepolymer and a curing agent containing a mixture of the above-mentioned acrylic polyol and fluorine-containing polyol. The mixing ratio of the acrylic polyol and the fluorinated polyol is preferably from 20/80 to 80/20 in mass ratio.

By using the mixture of the water-based acrylic resin-based topcoat and the fluoropolymer-based topcoat, a topcoat layer excellent in balance between long-term weather resistance and mechanical properties such as elongation can be formed. Further, there is no odor due to the solvent, and even if the urethane-based coating film waterproofing material contains a large amount of a plasticizer, the adhesiveness is excellent, and the long-term weather resistance is also good.

Next, a waterproofing method using the urethane coating film of the present invention will be described. The waterproofing method of the present invention can be implemented, for example, as follows.

1) The above-mentioned water-based primer is applied on the building frame and sufficiently cured. The coating amount of the aqueous primer is preferably 0.1 to 0.5 kg / m ² . In addition, a coating method is not particularly limited, and a general method such as a roller, a brush, a trowel, and a lake is employed.

2) The solvent-free urethane coating waterproofing material is applied on the sufficiently cured aqueous primer layer and cured sufficiently. The amount of one application of the solventless urethane-based waterproof film is not particularly limited, but may be 2.0 to 3.5 kg / m.
² is preferred. Further, it is preferable to apply the waterproof material once or twice. The application method is not particularly limited. For example, in the case of a two-part or one-part type waterproof material, a method similar to the above-described method of applying the primer is employed.

3) The above-mentioned water-based top coat is applied on the layer of the fully cured urethane-based coating waterproofing material, and sufficiently cured. The coating amount of the aqueous top coat is 0.1 to 0.3
kg / m ² is preferred. In addition, the top coat is
It is preferable to apply it once. The method of application is the same as the method of applying the primer.

The urethane-based coating film waterproofing method of the present invention as described above is preferably applied to the construction of a waterproof layer such as the roof of a building, a veranda, a balcony or an open corridor, or the repair of a waterproof layer.

[0046]

EXAMPLES The urethane-based coating film waterproofing method of the present invention will be specifically described below with reference to Examples 1 to 4 and Comparative Examples 1 and 2, but the present invention is not limited thereto. In the following description, “parts” represents “parts by mass”.

Example 1 The following primers, urethane-based waterproof coating materials, and top coats were sequentially applied to a 900 mm square slate plate base in a room at 23 ° C. and a relative humidity of 50%, respectively, and cured.
The coating waterproof layer of the example was formed.

As a primer, a main agent (solid content: 45% by mass) obtained by emulsifying a bisphenol A epoxy resin (epoxy equivalent: 190) and an aliphatic polyamine (amine value: 220 mgKOH / g) were emulsified by a hardening agent (solid content: 35% by mass) and Portland cement were mixed at a mass ratio of 1/1/2 using a roller to apply (application amount: 0.3 kg /
m ² ) and fully cured.

Next, 17.04 parts of polypropylene triol (molecular weight: 3,000) and 68.14 parts of polypropylene diol (molecular weight: 2,000) were added as a waterproofing material to tolylene diisocyanate (95% by mass of 2,4-isomer).
An isocyanate group-terminated prepolymer (isocyanate group content: 3.5% by mass) obtained by reacting 14.82 parts of (NCO / OH ratio = 2.0) was used as a main component, and 4,4 ′
-Methylenebis (2,6-diethylaniline) 1.61
Part, 4,4'-methylenebis (2-ethylaniline)
A liquid obtained by dissolving 1.32 parts and 1.24 parts of diethyltoluenediamine in 32.83 parts of dioctyl phthalate was mixed with 60 parts of calcium carbonate and 3 parts of a pigment paste as a curing agent. Mass ratio of curing agent = 1/2
(NCO / (NH2 + OH) ratio = 1.2) was applied using a gold trowel (application amount: 2.5 kg / m ² ) and was sufficiently cured.

Finally, as a top coat, 95 parts of an isocyanate group-terminated prepolymer (isocyanate group content: 7.0% by mass) obtained by reacting polyoxytetramethylenediol (molecular weight: 850) with hexamethylene diisocyanate; A main agent consisting of a mixture of 5 parts of propylene glycol monomethyl ether acetate and styrene, n-butyl acrylate and 2-hydroxyethyl methacrylate obtained by copolymerization,
Acrylic polyol (having a molecular weight of 200 per hydroxyl group)
0) 45 parts of a coloring pigment was mixed with 25 parts of a coloring pigment, and a curing agent (solid content: 70% by mass) obtained by emulsifying the mixture and water as a diluent were mixed so that the weight ratio became 2/10/3. Mix and apply using a roller (application amount 0.1 kg
/ M ² ) and fully cured.

Example 2 After the same primer as in Example 1 was applied and sufficiently cured, the same isocyanate group-terminated prepolymer as in Example 1 (isocyanate group content: 3.5) was used as a waterproof material.
Mass%) as the main ingredient and 3.0 parts of diethyltoluenediamine.
9 parts in 33.91 parts of dioctyl phthalate are dissolved in 60 parts of calcium carbonate and 3 parts of pigment paste.
Using the partially mixed liquid as a curing agent, the mass ratio of the main agent / curing agent =
1/2 (NCO / (NH2 + OH) ratio = 1.2) blended and applied using a gold iron (coating amount 2.5 kg / m ² )
And fully cured.

Finally, as a top coat, 95 parts of an isocyanate group-terminated prepolymer (isocyanate group content: 7.0% by mass) obtained by reacting polyoxytetramethylenediol (molecular weight: 850) with hexamethylene diisocyanate; Fluorine-containing polyol obtained by copolymerizing a main agent consisting of a mixture of 5 parts of propylene glycol monomethyl ether acetate and ethyl vinyl ether, chlorotrifluoroethylene and hydroxybutyl vinyl ether (fluorine content about 24% by mass, per hydroxyl group) 45 parts of (molecular weight: 1600), 25 parts of a coloring pigment are mixed, and a curing agent (solid content: 70% by mass) obtained by emulsifying the mixture is mixed so as to have a mass ratio of 1/4, respectively, and applied using a roller. (Coating amount 0.1
kg / m ² ).

Example 3 As primers, 30 parts of water, 1 part of sodium lauryl sulfate, 35 parts of dioctyl phthalate, and castor oil (hydroxyl value 160 mg KOH / g, average number of functional groups 2.7) 3
100 parts emulsion mixed with 4 parts, Crude MD
100 parts of I and 135 parts of white cement were uniformly mixed, and this composition was applied using a roller to a thickness of 0.6 mm and sufficiently cured.

Next, the same isocyanate group-terminated prepolymer as in Example 1 (isocyanate group content: 3.5% by mass) was used as the main component, and 4,4'-methylenebis (2,6-diethylaniline) was 0.98. Part, 4,4'-
0.75 parts of methylenebis (2-ethylaniline), 1.41 parts of diethyltoluenediamine, propylene oxide adduct of monoethanolamine (hydroxyl value 480 mgK
OH / g, average number of functional groups 3) A molten mixture obtained by dissolving 0.77 part of dioctyl phthalate in 33.09 parts of 60 parts of calcium carbonate and 3 parts of pigment paste was used as a curing agent. Mass ratio of curing agent = 1/2 (NCO /
(NH2 + OH) ratio = 1.2), and the composition was applied (applied amount: 2.5 kg / m ² ) using a gold trowel and cured sufficiently.

Finally, as a top coat, 95 parts of an isocyanate group-terminated prepolymer (isocyanate group content: 7.0% by mass) obtained by reacting polyoxytetramethylene diol (molecular weight: 850) with hexamethylene diisocyanate; Acrylic polyol (molecular weight per hydroxyl group: 2000) obtained by copolymerizing styrene, n-butyl acrylate and 2-hydroxyethyl methacrylate with a main agent consisting of a mixture of 5 parts of propylene glycol monomethyl ether acetate and styrene, n-butyl acrylate
20 parts of a fluorinated polyol obtained by copolymerizing ethyl vinyl ether, chlorotrifluoroethylene and hydroxybutyl vinyl ether (fluorine content of about 24
% By mass, molecular weight per hydroxyl group: 1600), and 25 parts by weight of a color pigment were mixed and emulsified to obtain a curing agent (solid content: 70% by mass), each having a mass ratio of 1%.
/ 4, and applied using a roller (application amount: 0.1 kg / m ² ).

Example 4 After the same primer as in Example 1 was applied and sufficiently cured, 28.6 parts of polyoxypropylene triol (molecular weight: 6000) was added as a waterproofing material to 4,4'-diphenylmethane diisocyanate. 3.4 parts (NCO / O
(H ratio = 1.9), and the isocyanate group-terminated prepolymer (isocyanate group content: 1.65% by mass) was added to 15 parts of dioctyl adipate, 47 parts of calcium carbonate, 6 parts of pigment paste, and One-part urethane waterproofing material mixed with 0.3 part of (2-morpholinoethyl) ether is applied using a gold iron (a coating amount of 2.5 kg / m).
² ) Then, after fully curing, the same top coat as in Example 1 was applied and fully cured.

Comparative Example 1 As a primer, 16.0 parts of polyoxypropylene triol (molecular weight: 420) and 8.0 parts of polyoxypropylene diol (molecular weight: 1000) were added with tolylene diisocyanate (80 mass% of 2,4 isomer) 18 .0 parts (N
(CO / OH ratio = 4.55), and the isocyanate group-terminated prepolymer was diluted with 58 parts of xylene to obtain a prepolymer solution (isocyanate group content: 3.1% by mass). The prepolymer solution was applied using a roller (application amount: 0.25 kg / m ² ) and sufficiently cured.

Next, as a waterproofing material, 17 parts of polypropylene triol (molecular weight: 3,000), 68 parts of polypropylene diol (molecular weight: 2,000), 15 parts of tolylene diisocyanate (80 mass% of 2,4-isomer) and 15 parts (NC
(4 / 4′-methylenebis (2-chloroaniline)), with the isocyanate group-terminated prepolymer (isocyanate group content: 3.6% by mass) obtained by the reaction of O / OH ratio = 2.03) as the main ingredient. In a molten mixture obtained by dissolving 3 parts in 21.04 parts of polypropylene diol (molecular weight: 2,000), 2.66 parts of dioctyl phthalate, 10 parts of xylene, 55 parts of calcium carbonate, 3 parts of pigment paste, and 2-ethylhexane Lead acid (lead content 24% by mass) 1
The mixture obtained by mixing the parts is used as a curing agent and mixed at a mass ratio of main agent / curing agent = 1/1 (NCO / (NH2 + OH) ratio = 1.1) and applied using a gold iron (application amount: 2.5 kg) /
m ² ) and fully cured.

Finally, as a top coat, 40 parts of an isocyanate-terminated prepolymer (isocyanate group content: 6.0% by mass) obtained by reacting polyoxytetramethylene diol (molecular weight: 850) with hexamethylene diisocyanate was used. A main ingredient consisting of a mixture of 60 parts of toluene, styrene, n-butyl acrylate and 2
-Acrylic polyol obtained by copolymerizing hydroxyethyl methacrylate (having a molecular weight of 25
00) A curing agent composed of a solution obtained by mixing 20 parts of a coloring pigment and 40 parts of toluene in 40 parts (solid content: 60% by mass)
Were mixed so as to have a mass ratio of 2/3, respectively, and were applied using a roller (application amount: 0.2 kg / m ² ) and sufficiently cured.

Comparative Example 2 After the same primer as in Comparative Example 1 was applied and sufficiently cured, the same waterproofing material as in Example 1 was used as a waterproofing material.
It was applied using a gold iron (application amount: 2.5 kg / m ² ), and was sufficiently cured. Finally, the same top coat as in Comparative Example 1 was applied using a roller (application amount: 0.2 kg / m ² ).
And fully cured.

Test Examples The coating film waterproof layers obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were evaluated for performance by the following methods. The results are shown in Tables 1 and 2.

<Odor> The odor at the time of applying each of the primer, the urethane-based coating waterproofing material, and the top coat was examined organoleptically. In the table, ○ indicates no solvent odor and X indicates solvent odor.

<Curability> In a laboratory at 23 ° C. and 50% RH, the time required for walking (unit: hours) after the primer, the urethane-based coating waterproofing material and the top coat were applied, respectively, after being applied. Was examined.

<Adhesiveness of top coat> 23 ° C., 50% R
In the laboratory H, a top coat was applied 5 days after the application of the waterproof material, and the tack and adhesion of the top coat 24 hours later were observed.

<Mechanical Physical Properties> The mechanical properties of the waterproof layer were measured according to JIS-A6021. In the table, Ts is the tensile strength (unit: N / mm ² ), and E is the elongation at break (unit:
%).

<Gloss Retention> The above 900 mm square coated plate piece was exposed outdoors for a certain period (one month or two months).
Gloss was measured by a 60-degree specular gloss measurement method in accordance with IS-Z8741, and the gloss retention (%) was determined by the following equation. (Gloss retention ratio) = 100 × (Gloss after a certain period of time)
/ (Initial gloss)

[0067]

[Table 1]

[0068]

[Table 2]

From the results shown in Tables 1 and 2, the waterproof coating layers of Examples 1 to 4 did not generate odor, had sufficient strength and gloss retention of the coating layer, and exhibited mechanical strength and weather resistance. It turns out that it is excellent. Further, the urethane waterproofing material was firmly adhered to the slate base, and the top coat was also sufficiently adhered to the urethane waterproofing material.

On the other hand, in Comparative Example 1 in which a solvent was used for the primer, the waterproof material, and the top coat, an odor due to the solvent was generated. Also, in Comparative Example 2 in which a solvent was used for the primer and the top coat, an odor due to the solvent was generated, and the waterproof material was firmly adhered to the slate substrate. Was insufficient and could not be subjected to a gloss retention test.

[0071]

As described above, according to the present invention,
Waterproofing can be performed under very favorable conditions for environmental hygiene without emitting strong odor. In addition, the formed coating waterproof layer is as dry as the conventional solvent-based coating waterproof layer,
Curable, adhesive, mechanical properties, and has weather resistance, especially in the urethane waterproof layer with a large amount of plasticizer, the adhesion of the top coat does not decrease, the waterproofing method of the present invention,
It can be suitably used for the construction of a waterproof layer such as the roof of a building, a veranda, a balcony or an open corridor or the repair of a waterproof layer.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 175/04 C09D 175/04 175/08 175/08 175/12 175/12 E04F 15/12 E04F 15 / 12 C (72) Inventor Yukio Akimoto No. 23 Kawaramachi, Kuki-shi, Saitama F-term in Asahi Glass Polyurethane Construction Materials Co., Ltd. PA07 PB05

Claims (7)

[Claims] 1. A solvent-free urethane coating waterproofing material containing (a) an aqueous primer and (b) a plasticizer in an amount of 5% by mass or more based on the total amount of the coating waterproofing material on the surface of the building in order from the surface of the building. (C) In a waterproofing method of sequentially applying an aqueous top coat, the plasticizer is a phthalate ester, an aliphatic dibasic ester, a phosphate ester, an epoxy fatty acid ester, a glycol ester, a chlorinated paraffin, A urethane-based coating film waterproofing method, which is one or more selected from petroleum-based ones. 2. The non-solvent type urethane coating waterproofing material is a two-pack type waterproofing material comprising a main component having an isocyanate group-terminated prepolymer as a main component and a curing agent having an aromatic polyamine as a main component. Item 7. The urethane-based coating film waterproofing method according to Item 1. 3. The solvent-free urethane coating waterproofing material according to claim 1, wherein a main agent mainly composed of an isocyanate group-terminated prepolymer obtained by a reaction between polyoxypropylene polyol and tolylene diisocyanate, and a curing agent containing diethyltoluenediamine The urethane-based coating waterproofing method according to claim 1 or 2, which is a two-part waterproofing material comprising: 4. The urethane coating waterproofing method according to claim 1, wherein the solvent-free urethane coating waterproofing material is a moisture-curable one-pack waterproofing material containing an isocyanate group-terminated prepolymer as a main component. 5. The water-based primer according to claim 1, wherein the water-based primer is one or more selected from a water-based epoxy resin-based primer, a water-based urethane resin-based primer, and a water-based acrylic resin-based primer. The described urethane coating waterproofing method. 6. The urethane according to claim 1, wherein the aqueous topcoat is one or a mixture of two or more selected from an aqueous acrylic resin-based topcoat and a fluoropolymer-based topcoat. Waterproof coating method. 7. The urethane-based waterproofing method according to claim 1, wherein the method is applied to construction or repair of a waterproof layer on a rooftop, a veranda, a balcony, or an open corridor of a building.