JP2002102797A - Coating film forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating film forming method by which a film having excellent waterproofness, adhesion and contamination resistance and can maintain beautiful appearance for a long period of time is formed without the occurrence of crazing, peeling, or the like, with lapse of time. SOLUTION: After a coating material (A) for forming the coating film of 50 to 800% in an elongation rate at a 20 deg.C atmosphere is applied, a coating material (B) essentially consisting of a synthetic resin emulsion having a reactive silyl group and a polysiloxane compound having a polyoxylalkylene chain having OH group at one terminal and having hydroxyl valence of 5 to 150 KOHmg/g as essential components is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the finishing of paints on various types of objects such as buildings, civil engineering structures, and construction materials used in the same, and the renovation of the surface of the object to an existing coating film. The present invention relates to a method for forming an antifouling coating film that can be used for renovation painting and is mainly intended to protect a building such as a building or a civil engineering structure.

[0002]

2. Description of the Related Art Conventionally, various types of paint finishing have been performed to protect a vehicle body such as a building or a civil engineering structure, to impart designability and to improve aesthetics. Recently, changes in temperature, humidity,
Measures against deterioration of concrete due to carbon dioxide in the atmosphere and measures to prevent water leakage from the outer wall have been reviewed, and they have the ability to follow cracks (hereinafter referred to as "cracks") on the concrete outer wall and have the effect of preventing water leakage from the outer wall. Elastic coating materials have attracted attention and are widely used.

[0003] In addition, dry construction methods using dry building materials, such as siding boards and extruded boards, have been greatly increased in housing-related fields, etc., instead of the conventional wet construction method using plasterers. The joints (joints) of such dry building materials are joined by a sealing material, and when the entire outer wall including the sealing material is to be painted, the joints of the building materials, that is, the sealing material is cast. An elastic coating material that follows the movement of the part is used.

Further, elastic coating materials are often used for materials such as metals which have relatively large expansion and contraction, and also for substrates which are expected to have a structural movement.

[0005] However, the elastic coating film formed in this way has a drawback that the surface is generally inferior in stain resistance to the hard type coating film.

[0006] In general, techniques for improving the stain resistance include:
There is a method of increasing the glass transition temperature (hereinafter, referred to as “Tg”) of the resin constituting the coating material. However, this method causes a decrease in the ability to follow the base, and causes cracks and peeling over time, and A sufficient effect of improving stain resistance cannot be obtained, which is not preferable.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and does not cause cracking or peeling over time, and has excellent waterproofness, adhesion, and stain resistance. It is an object of the present invention to provide a method for forming a coating film that can maintain an aesthetic appearance over a long period of time.

[0008]

Means for Solving the Problems In order to solve these problems, the present inventors have made intensive studies, and as a result, the temperature of 20 ° C.
After coating a coating material that forms a coating film having an elongation of 50 to 800% under an atmosphere, a synthetic resin emulsion having a reactive silyl group and a coating material containing a polysiloxane compound having a specific side chain are prepared. It has been found that painting is effective, and the present invention has been completed.

That is, according to the present invention, the elongation percentage under a 20 ° C. atmosphere is 50 to 80 on the surface of a building or a civil engineering structure.
After coating the coating material (A) forming a 0% coating film, (B-
1) a synthetic resin emulsion having a reactive silyl group,
(B-2) a polysiloxane compound having a polyoxyalkylene chain having an -OH group at one end and a hydroxyl value of 5 to 150 KOHmg / g as a main component, and a solid content of 100% by weight of (B-1) (B-2) to 0.1-8.
A coating film forming method characterized by coating a coating material (B) containing 0 parts by weight.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail along with its embodiments.

[Coating material (A)] The coating material (A) in the present invention.
Is for forming a coating film having an elongation of 50 to 800%, preferably 75 to 500%, in a 20 ° C. atmosphere. If the elongation percentage is 50% or less, it is difficult to follow the displacement of the substrate, and cracks are likely to occur. If the elongation percentage is 800% or more, cracks occur in the coating material (B), resulting in poor waterproofness. The elongation percentage in the present invention is a value measured according to “Elongation test at 20 ° C.” in JIS A 6909 6.31 “Elongation test”.

The coating material (A) of the present invention is an aqueous type, a weak solvent type,
Although not particularly limited, such as a solvent type, an aqueous type coating material using a synthetic resin emulsion as a binder is particularly environmentally friendly,
It is preferably used from the viewpoint of measures against problems.

The synthetic resin emulsion is not particularly restricted but includes, for example, acrylic resin emulsion, urethane resin emulsion, vinyl acetate resin emulsion,
Ethylene-vinyl acetate copolymer resin emulsion, styrene-acrylate copolymer resin emulsion, vinyl acetate-acrylate copolymer resin emulsion,
Ethylene-vinyl chloride copolymer resin emulsion, vinyl acetate-veova copolymer resin emulsion, acrylate-vinyl chloride copolymer resin emulsion, epoxy resin emulsion, silicon-modified acrylic resin emulsion, fluororesin emulsion, etc. can be used, and can be mixed appropriately. It is also possible to use. Such an emulsion may be of a type that self-crosslinks inside the emulsion particles, or a two-part curing type in which a crosslinking agent is added to cause a crosslinking reaction. Further, a powder type emulsion can also be used.

Further, it is preferable to have a functional group capable of binding to a reactive silyl group after the formation of the coating film, since the adhesion to the base and the coating material (B), the conformability, and the waterproofness are improved.

Examples of the functional group capable of binding to the reactive silyl group after forming the coating film include a hydroxyl group, an amide group, a carbonyl group, a carboxyl group, a silanol group and an alkoxysilyl group. The method for introducing these functional groups is not particularly limited, and a known method can be used. Examples thereof include a method of polymerizing the functional group-containing monomer and a method of generating the functional group after the reaction.

The method of polymerizing the functional group-containing monomer can be carried out by a general emulsion production method such as emulsion polymerization, and is not particularly limited. As such a monomer, the following exemplified monomers can be used.

Examples of the hydroxyl group-containing monomer include, for example, 2
-Hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, polypropylene glycol mono (meth) acrylate, 1,6-hexanediol mono (Meth) acrylates and the like, and one or more of these can be used.

Examples of the amide group-containing monomer include:
Acrylamide, methacrylamide, N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate, N, N-diethylaminoethyl acrylate, N, N-diethylaminomethacrylate, N, N-dimethylaminopropyl acrylate,
N, N-dimethylaminopropyl methacrylate, N-
Examples include vinyl monomers having an acid amide group as a hydrophilic group such as methylolacrylamide, diacetoneacrylamide, and diacetonemethacrylamide, and one or more of these monomers can be used.

Examples of the carbonyl group-containing monomer include acrolein, diacetone acrylamide, diacetone methacrylamide, formylstyrene, vinyl methyl ketone, vinyl ethyl ketone, vinyl isobutyl ketone, acryloxyalkylpropanals, and methacryloxyalkylpropanal. , Diacetone acrylate, diacetone methacrylate, acetonyl acrylate, 2-hydroxypropyl acrylate acetyl acetate, butanediol acrylate acetyl acetate, and the like, and one or more of these can be used.

Examples of the carboxyl group-containing monomer include, for example, acrylic acid, methacrylic acid, crotonic acid, maleic acid, a monoalkyl ester thereof, fumaric acid or a monoalkyl ester thereof containing a carboxyl group.
Examples include ethylenically unsaturated carboxylic acids such as itaconic acid or its monoalkyl ester, fumaric acid or its monoalkyl ester, and one or more of these can be used.

Examples of the monomer containing a silanol group or an alkoxysilyl group include vinyltrimethoxysilane and
Vinyltriethoxysilane, vinyltri-n-butoxysilane, vinyltris (β-methoxyethoxy) silane, allyltrimethoxysilane, trimethoxysilylethylvinylether, triethoxysilylethylvinylether, trimethoxysilylpropylvinylether, triethoxysilylpropylvinylether, γ-
(Meth) acryloyloxypropyltrimethoxysilane, γ- (meth) acryloyloxypropyltriethoxysilane, γ- (meth) acryloyloxypropylmethyldimethoxysilane, vinylmethyldimethoxysilane, methyldimethoxysilylethylvinylether, methyldimethoxysilylpropylvinylether And one or more of these can be used.

Further, as a method for generating a functional group after the reaction, for example, a cross-linking reaction of a synthetic resin emulsion can be used. Examples of such a combination of crosslinking functional groups include a carboxyl group-carbodiimide group, a carboxyl group-epoxy group, a carboxyl group-aziridine group, a carboxyl group-oxazoline group, a carbonyl group-hydrazide group, an epoxy group-amino group. In the present invention, a carboxyl group-
Epoxy group, carboxyl group-oxazoline group crosslinking is preferably used. An example of a monomer having an epoxy group and an oxazoline group will be described below.

Examples of the epoxy group-containing monomer include epoxy derivatives such as glycidyl acrylate, glycidyl methacrylate and allyl glycidyl ether. One compound selected from these groups can be used alone, or two or more compounds can be used as a mixture. The carboxyl group-epoxy group crosslinking can be appropriately selected from these and used within a range that does not impair the effects of the present invention.

Examples of the oxazoline group-containing monomer include 2-vinyl-2-oxazoline and 2-vinyl-4
-Methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-ethyl- 2-oxazoline, 2-isopropenyl-4,5-dimethyl-2-
Oxazoline and the like can be mentioned, and one compound selected from these groups can be used alone, or two or more compounds can be used as a mixture. The carboxyl group-oxazoline group bridge can be appropriately selected from these and used within a range that does not impair the effects of the present invention.

The method for producing such a synthetic resin emulsion can be carried out by a general method for producing an emulsion, such as emulsion polymerization, and is not particularly limited. Also, the molecular weight of the manufactured synthetic resin emulsion,
The particle size is not particularly limited.

In the coating material (A), in addition to the above-mentioned components, an inorganic coloring pigment box, an organic coloring pigment, an extender and the like which are usually used for a coating material can be blended as required. In addition, a film-forming aid that does not affect the present invention, a plasticizer, a preservative, an antifungal agent, an alga-proofing agent, an antifoaming agent, a thickener, a leveling agent,
Additives such as pigment wetting agents, pigment dispersants, color separation inhibitors, emulsifiers, viscosity modifiers, anti-settling agents, anti-sag agents, curing catalysts, matting agents, flame retardants, etc. can be used alone or in combination. it can.

Examples of the inorganic color pigments include, for example, titanium oxide, zinc oxide, carbon black, ferric oxide (bengara), molybdate orange, graphite, yellow iron oxide, ocher, ultramarine, cobalt green, and the like. Examples of color pigments include, for example, azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone,
Disazo type, isoindolinone type, benzimidazole type, phthalocyanine type, quinophthalone type and the like can be used.

Examples of extenders include calcium carbonate, clay, kaolin, porcelain clay, diatomaceous earth, hydrous fine silica powder,
Talc, barite powder, barium sulfate, precipitated barium sulfate, barium carbonate, quartz sand, quartz powder, wollastonite,
White carbon or the like can be used.

[Coating Material (B)] The coating material (B) of the present invention is a synthetic resin emulsion having a reactive silyl group (hereinafter referred to as "B").
-1 ". ), And a polysiloxane compound having one end having an —OH group (hereinafter referred to as “B-2”) as an essential component.

In "B-1", the method for introducing a silyl group is not particularly limited, and various methods can be employed. For example, a reactive silyl group-containing vinyl monomer is copolymerized. Method, a method of reacting a silane compound after copolymerizing a reactive silyl group-containing vinyl monomer, a method of reacting a functional group in a resin with a coupling agent having a functional group capable of reacting with the functional group A method in which a functional group in a resin is reacted with a coupling agent having a functional group capable of reacting with the functional group, and then a silane compound is reacted.

As the reactive silyl group, an alkoxyl group, a phenoxy group, a mercapto group, an amino group,
Halogen and the like are bonded.

Examples of the reactive silyl group-containing vinyl monomer in the above are compounds containing a reactive silyl group and a polymerizable double bond, such as vinyltrimethoxysilane, vinyltriethoxysilane, and vinyltri-n. -Butoxysilane, vinyl tris (β-methoxyethoxy)
Silane, allyltrimethoxysilane, trimethoxysilylethyl vinyl ether, triethoxysilylethyl vinyl ether, trimethoxysilylpropyl vinyl ether, triethoxysilylpropyl vinyl ether, γ
-(Meth) acryloyloxypropyltrimethoxysilane, γ- (meth) acryloyloxypropyltriethoxysilane, γ- (meth) acryloyloxypropylmethyldimethoxysilane, vinylmethyldimethoxysilane, methyldimethoxysilylethyl vinyl ether,
Methyl dimethoxysilylpropyl vinyl ether and the like can be mentioned, and one or more of these can be used.

As the silane compound in (1), those having two or more reactive silyl groups in one molecule are used. For example, tetrafunctional alkoxysilanes such as tetraethoxysilane, tetramethoxysilane and tetrabutoxysilane; methyl Trimethoxysilane, methyltriethoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltributoxysilane, propyltrimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, phenyl Trifunctional alkoxysilanes such as trimethoxysilane, phenyltriethoxysilane, phenyltributoxysilane; dimethyldimethoxysilane, dimethyldiethoxysilane, dimethyldibutoxysilane, diethyldisilane Toxysilane, diethyldiethoxysilane, dipropyldimethoxysilane, dipropyldiethoxysilane, dibutyldimethoxysilane, dibutyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, diphenyldibutoxysilane, methylphenyldimethoxysilane, methylphenyldiethoxy Bifunctional alkoxysilanes such as silane; tetrachlorosilane, methyltrichlorosilane, ethyltrichlorosilane, propyltrichlorosilane, phenyltrichlorosilane, vinyltrichlorosilane, dimethyldichlorosilane, diethyldichlorosilane, diphenyldichlorosilane, methylphenyldichlorosilane, etc. Chlorosilanes: tetraacetoxysilane, methyltriacetoxysilane, phenyltriacetoxy Orchids, dimethyldiacetoxysilane, acetoxy silanes such as diphenyl diacetoxy silane and the like, can be used one or two or more thereof. Further, a compound having one reactive silyl group in one molecule can be used in combination.

Examples of the combination of the functional groups include a hydroxyl group and an isocyanate group, an amino group and an isocyanate group, a carboxyl group and an epoxy group, an amino group and an epoxy group, and an alkoxysilyl group. The coupling agent is, for example, a compound having at least one or more reactive silyl groups and other substituents in one molecule. Specifically, β- (3,4 epoxycyclohexyl) ethyltrimethoxysilane Γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, N- (β-aminoethyl)
-Γ-aminopropylmethyldimethoxysilane, N-
(Β-aminoethyl) -γ-aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ
-Aminopropyltriethoxysilane, isocyanate-functional silane and the like, and one or more of these can be used.

The "B-1" weight ratio of the silyl group in will usually be 0.1 to 70 wt% in terms of SiO ₂ to the resin solid content of the "B-1", particularly in the present invention, 0 .3
It is effective when it is 〜30% by weight. When the weight ratio of the silyl group in “B-1” is less than 0.1% by weight, the stain resistance tends to be poor, and when it is more than 70% by weight, cracks tend to occur.

The term "SiO ₂ equivalent" means that a compound having a Si--O bond is completely hydrolyzed and then converted to silica (SiO ₂ ) when calcined at 900 ° C., and is expressed in terms of the weight remaining. It is. In general, alkoxysilane, silicate, and the like have a property of reacting with water to cause a hydrolysis reaction to form silanol, and to cause a condensation reaction between silanols or silanol and alkoxy. When this reaction is performed to the ultimate, silica (SiO ₂ ) is obtained. These reactions are represented by the general formula: RO (Si (OR) ₂ O) _n R + (n + 1) H ₂ O → n
It is represented by a reaction formula of SiO ₂ + (2n + 2) ROH, and is obtained by converting the amount of the remaining silica component based on the reaction formula.

The copolymerization monomer of "B-1" is not particularly limited, but an acrylic monomer can be suitably used. Examples of the acrylic monomer include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, and 2-ethylhexyl (meth).
Alkyl-containing (meth) acrylic monomers such as acrylate and cyclohexyl (meth) acrylate; hydroxyl-containing (meth) acrylic monomers such as 2-hydroxyethyl (meth) acrylate; ethylene such as (meth) acrylic acid Unsaturated carboxylic acids; Amino group-containing (meth) acrylic monomers such as dimethylaminoethyl (meth) acrylate and dimethylaminopropyl (meth) acrylate; and amides such as (meth) acrylamide and ethyl (meth) acrylamide ( (Meth) acrylic monomers; nitrile group-containing (meth) acrylic monomers such as acrylonitrile; and epoxy group-containing (meth) acrylic monomers such as glycidyl (meth) acrylate.

In "B-1", in addition to the above monomers, aromatic hydrocarbon vinyl monomers such as styrene, methylstyrene, chlorostyrene and vinyltoluene; maleic acid, itaconic acid, crotonic acid, fumaric acid Α, β-ethylenically unsaturated carboxylic acids such as acetic acid and citraconic acid; sulfonic acid-containing vinyl monomers such as styrene sulfonic acid and vinyl sulfonic acid; acid anhydrides such as maleic anhydride and itaconic anhydride; vinyl chloride; Chlorine-containing monomers such as vinylidene and chloroprene; hydroxyl-containing alkyl vinyl ethers such as hydroxyethyl vinyl ether and hydroxypropyl vinyl ether; alkylene glycols such as ethylene glycol monoallyl ether and propylene glycol monoallyl ether diethylene glycol monoallyl ether Α-olefins such as ethylene, propylene and isobutylene; vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate and vinyl pivalate; vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, butyl vinyl ether and cyclohexyl vinyl ether; ethyl allyl Allyl ethers such as ether and butyl allyl ether can also be used. In addition, an ultraviolet absorber containing an ethylenically unsaturated double bond, a light stabilizer containing an ethylenically unsaturated double bond, and the like can also be used.

The emulsifier used in the polymerization is appropriately selected from anionic, cationic, nonionic, amphoteric, nonionic-cationic, nonionic-anionic, non-reactive, and reactive. Use alone or in combination. Among them, the use of a reactive emulsifier having a polyoxyalkylene chain and an unsaturated double bond is preferable because cracking prevention, water resistance and storage stability can be improved.

As the polymerization initiator, ordinary radical initiators can be used, such as persulfates such as ammonium persulfate, redox initiators comprising a combination of hydrogen peroxide and sodium hydrogen sulfite, and furthermore, Examples thereof include a system in which an inorganic initiator such as iron salt and silver nitrate is mixed, a dibasic acid peroxide such as disuccinic peroxide and diglutaric peroxide, and an organic initiator such as azobisbutyronitrile. The amount of the polymerization initiator is usually 0.01 to 100 parts by weight of the monomer.
It is about 5 parts by weight.

The weight average molecular weight of "B-1" is 30,000.
More preferably, it is more preferably 50,000 or more.
When the molecular weight is 30,000 or more, stain resistance,
Water resistance, weather resistance and the like can be improved. Also,
The minimum film formation temperature of “B-1” is preferably 0 to 80 ° C. When the minimum film forming temperature is lower than 0 ° C., the stain resistance tends to be inferior, and when the minimum film forming temperature is higher than 80 ° C., cracks tend to occur.

"B-2" is a component that imparts crack prevention, stain resistance and adhesion to the coating film formed from the composition of the present invention.
In the present invention, since a specific amount of “B-2” having a specific hydroxyl value is contained, the terminal —OH group of “B-2” is changed to “B-
It is presumed that it interacts moderately with the reactive silyl group of 1) and controls the rapid reaction between the reactive silyl groups. As a result, the occurrence of cracks in the coating film can be prevented. Further, in the present invention, the surface of the coating film is hydrophilized by the polyoxyalkylene chain of "B-2" so that stain resistance can be imparted. Further, the wettability is excellent, and the adhesion to the coating material (A) is improved. It is also effective.

“B-2” is a compound having a polyoxyalkylene chain having an —OH group at one side chain and / or at the end of a polysiloxane main chain. One or both.

[0044]

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[0045]

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(R ¹ and R ² are an alkyl group or a phenyl group, R ³ is an alkylene group or a phenylene group, R ⁴ is an alkylene group having 1 to ⁴ carbon atoms, and may have the same or different carbon atoms. An integer greater than or equal to 1.)

"B-2" can be produced, for example, by a hydrosilylation reaction of an allylated polyether compound and methyl hydrogen silicone oil.

The hydroxyl value of "B-2" is from 5 to 150 KO.
Hmg / g, and 10-100 KOHmg / g
g, more preferably 40 to 80 KOH mg / g.
If the hydroxyl value is less than 5 KOHmg / g, cracks are likely to occur, and the stain resistance tends to decrease over time. If it is greater than 150 KOHmg / g, cracks tend to occur.

Examples of the alkylene oxide include methylene oxide, ethylene oxide, propylene oxide, butylene oxide and the like. Of these, ethylene oxide and / or propylene oxide are preferably used.

The number average molecular weight of “B-2” is 1000 to 5
0000 is desirable. Of these, the number average molecular weight of the alkylene oxide chain is preferably from 40 to 30,000. When the number average molecular weight of the alkylene oxide chain is less than 40, sufficient physical properties cannot be obtained in crack prevention and stain resistance. Conversely, if it is greater than 30,000, the water resistance, stain resistance, and weather resistance will decrease.

The content of “B-2” is 0.1 to 8.0 parts by weight based on 100 parts by weight of the solid content of “B-1”.
When the content of "B-2" is smaller than 0.1 part by weight,
Sufficient physical properties are not obtained in crack prevention, stain resistance, and adhesion. If the amount is more than 8.0 parts by weight, crack prevention, water resistance, weather resistance, and recoating properties are reduced.

In the coating material (B), in addition to the above-mentioned components, if necessary, inorganic coloring pigments, organic coloring pigments, extender pigments and the like which are usually used in paints can be blended. Also,
Film-forming aids that do not affect the present invention, plasticizers, preservatives,
Antifungal agent, antialgal agent, defoamer, thickener, leveling agent, pigment wetting agent, pigment dispersant, color separation inhibitor, emulsifier, viscosity modifier, anti-settling agent, anti-sag agent, curing catalyst, gloss Eraser,
Additives such as a flame retardant, an ultraviolet absorber, a light stabilizer and an antioxidant may be used alone or in combination.

Examples of the inorganic color pigments include, for example, titanium oxide, zinc oxide, carbon black, ferric oxide (bengara), molybdate orange, graphite, yellow iron oxide, ocher, ultramarine, cobalt green, and the like. Examples of color pigments include, for example, azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone,
Disazo type, isoindolinone type, benzimidazole type, phthalocyanine type, quinophthalone type and the like can be used.

Examples of extenders include calcium carbonate, clay, kaolin, porcelain clay, diatomaceous earth, hydrous fine silica powder,
Talc, barite powder, barium sulfate, precipitated barium sulfate, barium carbonate, quartz sand, quartz powder, wollastonite,
White carbon or the like can be used.

The dispersant used when the pigment is used is not particularly limited, but an anionic dispersant having a polyoxyalkylene chain may be used to secure crack prevention, storage stability, and high gloss in a glossy paint. It is preferably used.

[Construction Method] The present invention is intended to finish painting various kinds of objects such as buildings, civil engineering structures and construction materials used in them, and to renovate the surface of the object to an existing coating film.
Can be used for renovation painting. As a base,
It is not particularly limited as long as it is used as a general building material, for example, metal, glass, porcelain tile, gypsum board, calcium silicate board, plywood, asbestos slate board, concrete, siding board, extruded board, plastic, etc. Can be used for surface finishing of various materials.

In the present invention, the coating material (A) is first applied to such a base. The coating material (A) can be applied directly to the base, or can be applied after some surface treatment (eg, base treatment with a sealer, filler, or the like). The coating material (A) has an elongation percentage of 5 at 20 ° C.
Although it is necessary to form a coating film of 0 to 800%, coating is usually performed at a coating amount of 0.4 to 4.0 kg / m ² . The drying time is 3 hours or more. As a painting instrument, a ricin gun, a tile gun, a universal gun, a spray gun, a trowel, a roller, a brush, and the like are used.

Next, the coating material (B) is applied. Coating material (B)
Is usually applied at a coating amount of 0.2 to 0.5 kg / m ² . The drying time is 16 hours or more. A spray gun, a roller, a brush, or the like is used as a coating device. As the shape of the coating film obtained by the present invention, citron skin,
Various shapes such as rippled, stucco, lysine, stone, rock face, staple, crater, fiber, and irregularities are possible.

[0059]

EXAMPLES Examples and comparative examples are shown below to further clarify the features of the present invention.

[Preparation of paint] Using the raw materials shown in Tables 1 and 2, paints were prepared according to the formulations shown in Table 3, and each test was conducted.

[0061]

[Table 1]

[0062]

[Table 2]

[0063]

[Table 3]

[Test Method] Resistance to Wet / Cool Heat Repeatability Between two slate plates of 300 × 100 × 6 mm, 3
After applying a coating material (A) to a test material on which a sealing material of 00 × 10 × 6 mm was cast by a roller so as to have a coating amount of 1.0 kg / m ^2, and drying for 24 hours in a standard state,
Further, a test body was prepared by spray coating the coating material (B) so that the coating amount was 0.3 kg / m ² . According to JIS K5660 4.13, the prepared specimen was immersed in water at 20 ± 2 ° C for 18 hours, immediately cooled in a thermostat kept at −20 ± 3 ° C for 3 hours, and then cooled to 50 ± 3 ° C. The mixture was heated in another kept constant temperature bath for 3 hours. After repeating this operation 10 times,
After leaving it in the standard state for about 1 hour, the state of the coating film surface was visually observed. The evaluation is as follows. ：: No crack or peeling ×: Crack or peeling is observed

Rain streak stain resistance The coating material (A) was roller-coated on a 300 × 100 × 3 mm flexible plate so as to have a coating amount of 1.0 kg / m ^2, and dried for 24 hours in a standard state. Further, the coating material (B) was spray-coated so as to have a coating amount of 0.3 kg / m ² to prepare a test body. After the prepared test body was dried and cured in a standard state for 7 days, a groove inclined at 10 degrees with respect to a horizontal plane and having a length of 600 mm and a depth of 10 mm was 35 mm.
Mounted vertically on a pedestal with a roof carved with pitch so that the rain falling on the roof runs down streaks on the coating surface,
In this state, exposure was performed for 6 months, and the state of rain streak stain was visually evaluated. The evaluation is as follows. ○: Almost no rain streak contamination △: Slight rain streak contamination observed ×: Rain streak contamination clearly observed

Soil penetration resistance A flexible material of 300 × 100 × 3 mm was coated with the coating material (A) by a roller so as to have a coating amount of 1.0 kg / m ² and dried for 24 hours in a standard state. Thereafter, the coating material (B) was further spray-coated so as to have a coating amount of 0.3 kg / m ² to prepare a test body. After the prepared test body was dried and cured in a standard state for 7 days, a 15% by weight aqueous solution of carbon black was dropped on the coating film surface so as to have a diameter of 20 mm and a height of 5 mm. Left for 2 hours. Thereafter, the film was washed in running water, and the degree of contamination on the coating film surface was visually evaluated. The evaluation is as follows. ：: almost no trace △: slight trace ×: obvious trace

JIS K5
Adhesion was evaluated by the crosscut tape method according to 400 8.5. The evaluation is as follows. ◎: No peeling ○: The area of the peeled defective part is less than 15% Δ: The area of the peeled defective part is 15% or more and less than 35% ×: The area of the peeled defective part is 35% or more

[Test Results]

[Table 4]

Table 4 shows the test results. In Examples 1 to 6, which are the compositions of the present invention, good results were obtained in all tests. In particular, Examples 4 to 6 in which the coating material (A) contains an emulsion obtained by copolymerizing a hydroxyl group- or amide group-containing monomer or has a crosslinking reaction, results in further excellent adhesion to the coating material (B). I got On the other hand, Comparative Examples 1 and 2, in which the elongation percentage of the coating material (A) is out of the range of the present invention,
Comparative Example 3 in which the hydroxyl value of the polysiloxane compound of the coating material (B) is out of the range, Comparative Example 4 in which the coating material (B) does not contain the polysiloxane compound, and a coating material (B) in which the emulsion contains a silyl group and polysiloxane. In Comparative Example 5 containing no compound, sufficient results could not be obtained.

[0070]

According to the coating method of the present invention, the coating material (A) and the coating material (B) are laminated to prevent the occurrence of cracks or peeling over time, and to provide waterproofness, adhesion and It is possible to provide a coating film which is excellent in stain resistance and can maintain an aesthetic appearance for a long time.

Claims (2)

[Claims] 1. The surface of a building or a civil engineering structure is set at 20 ° C.
After coating a coating material (A) that forms a coating film having an elongation percentage of 50 to 800% under an atmosphere, (B-1) a synthetic resin emulsion having a reactive silyl group, (B-2) one end is -O
A polysiloxane compound having a polyoxyalkylene chain as an H group and a hydroxyl value of 5 to 150 KOH mg / g as a main component, and (B-2) based on 100 parts by weight of a solid content of (B-1) A coating material containing 0.1 to 8.0 parts by weight of a coating material (B). 2. The coating material according to claim 1, wherein the binder of the coating material (A) is a synthetic resin emulsion having a functional group capable of binding to a reactive silyl group of the coating material (B). Film formation method.