JP3088073B2 - Paint finishing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the finishing of paints on various objects such as buildings, civil engineering structures, and building materials used in them, and the renovation of the surface of the object to an existing coating film.
It relates to the renovation paint finish.

[0002]

2. Description of the Related Art Conventionally, the coating finish on a general building or civil engineering construction is to remove a deteriorated old paint film in the case of renovation, and then directly apply it to a base adjustment material in the case of a new construction. A method of applying a finish coating material (a sealer or a primer) and then applying a finish coating material after performing a smoothing treatment on the base material has been adopted. On the other hand, in recent years, the weather resistance of a coating film has been improved to some extent, and thus the number of times of repainting without removing the existing coating film has been increasing. However, even in the repainting work that left these existing coatings, in order to erase the texture pattern of the existing coatings, after applying the base coat after performing the base adjustment, apply the finishing coating material, Even in repainting that leaves the texture pattern of the existing coating film, a finish coating material is applied after applying a primer material. This is a finishing coating material for the purpose of aesthetics and protection of the object to be coated.
While the emphasis is on gloss, pattern, physical and chemical durability, the objects to be painted vary in type and surface condition, and all of them Close contact with
This is because it is difficult to maintain good appearance and protection of the object to be coated. Therefore, prior to finishing the coating on the object to be coated, apply a base adjustment material that is excellent in adhesion to the object and surface smoothness of the object to be coated, and further apply a primer to the surface. Thus, a method of applying a coating on the surface of such an undercoating material has come to be performed. In such a method, there is an advantage that the coating can be finished without being affected by the type and surface state of the object to be coated, but there is also a disadvantage that the number of steps of applying such a base adjustment material or an undercoat material increases. is there. Therefore, recently, a material called a surfacer, which adheres to an existing coating film with one material and has a role of a base adjustment material and a role of a primer, has been put on the market.

Examples of such a surfacer include an acrylic emulsion based on an aqueous acrylic emulsion, an epoxy based on a solvent-type two-component reaction-curable epoxy resin, an admixture of an aqueous emulsion and cement, and a powder. There are polymer-packaged and the like consisting of two packs of the body, and in particular, these surfacers are characterized in that they are made microelastic in order to follow cracks and expansion and contraction of the object to be coated.

On the other hand, in recent years, for the purpose of protecting the global environment,
Efforts are being made to reduce the organic solvents that cause air pollution and odors. Such a trend is not an exception in the paint and coating industry, and the surfacer as described above is actually converting to water. An aqueous synthetic resin emulsion is the basic technology of such aqueous conversion.

[0005] Such an aqueous synthetic resin emulsion is
High-molecular-weight synthetic resin particles are dispersed in an aqueous solvent by emulsion polymerization or the like.By evaporating water as a solvent, the synthetic resin particles come closer to each other, and eventually contact and fuse. It forms a film. Furthermore, glycidyl group and carboxyl group, hydrazide group and carbonyl group, as monomers of synthetic resin particles of this emulsion,
By including a monomer having a functional group that causes a cross-linking reaction such as an epoxy group and an amino group (hereinafter, referred to as a functional group monomer), the bond between the synthetic resin particles at the time of fusion is made stronger and formed. In some cases, the durability of the film is improved.

[0006] With respect to the surfacer using such an aqueous synthetic resin emulsion, the type of finish coating material has not yet been completely converted to an aqueous system, and when considering excellent weather resistance and coating in cold regions. At present, the use ratio of the solvent type is still high. As described above, an aqueous surfacer, particularly a crosslinked emulsion containing a functional group monomer, forms a coating by fusing and crosslinking of synthetic resin particles, so that the formed coating has such a solvent-type finish. Depending on the coating material, it is not easily dissolved, so on new foundations such as buildings, the surfacer is aqueous,
It has been considered that the finish coating material is coated by a combination of solvent type.

[0007]

However, the conventional aqueous surfacer has the following problems. In other words, conventional cross-linkable acrylic emulsion surfacers are insoluble in solvents, so when there is an existing coating that can be dissolved by the solvent on the surface of the object to be coated, repainting, that is, when renovating, finish When the solvent type is used as the coating material, the surface coating film is not dissolved by the solvent of the finishing coating material,
Since the solvent that has penetrated into the existing coating film dissolves the existing coating film, a phenomenon that the surfacer coating film gets stuck and rises (hereinafter, referred to as lifting) has occurred. For example,
As shown in FIG. 1, when the existing coating film is a one-component solvent-type acrylic resin coating film, after applying a cross-linking type acrylic emulsion-based surfacer to the surface thereof, when applying a solvent-type finishing coating material, While the one-component solvent-type acrylic resin coating film is redissolved by the solvent, the cross-linking type acrylic emulsion-based surfacer does not easily dissolve in the solvent, and thus appears as a blemishes at the interface. . For this reason, a solvent type finish coating material could not be used depending on the kind of the existing coating film.

Further, in the case of a conventional non-crosslinked type acrylic emulsion surfacer, particularly when a solvent type two-pack reaction hardening type finish coating material is used, the surface of the surfacer itself is redissolved. One application of the coating material does not cause any particular problem, but in the case of re-coating after curing of the finishing coating material (hereinafter referred to as recoating), the surfacer itself becomes the same state as the above-mentioned existing coating film. First, the first finish coating film had a lifting phenomenon. For example, as shown in FIG. 2, when the existing coating film is a one-component solvent-type acrylic resin coating film, a non-crosslinking type acrylic emulsion-based surfacer is applied to the surface thereof, and then a solvent-type two-component reaction-curable urethane resin coating material. Even if it is applied, the one-component solvent type acrylic resin coating film and the non-crosslinked type acrylic emulsion surfacer only re-dissolve in the solvent, respectively, there is no particular problem, but the solvent type two-component reaction curing type urethane resin paint After complete curing, if the solvent-based two-part reaction-curable urethane resin paint is recoated, the non-crosslinked type acrylic emulsion-based surfacer is redissolved, whereas the solvent-type two-part reaction-curable urethane resin is re-dissolved. Since the coating film is difficult to dissolve in the solvent, it appears as a dirt at the interface.

Further, in the case of an existing coating film or a coating film in which the finish coating material has elasticity, the adhesion to the surfacer may be insufficient and delamination may occur. Therefore, in any of the above-mentioned acrylic emulsion-based, epoxy-based, and polymer cement-based surfacers, it is usually necessary to use a special undercoating material for an elastic finish coating material.
Epoxy and polymer cement surfacers are of a two-part mixed type, and have problems in the time required for preparation and in the reaction curability at low temperatures.

[0010] Therefore, the problem to be solved by the present invention is to select the type of the object to be coated, the existing coating film on the surface of the object to be coated, and the finish coating material in spite of being an aqueous system in line with the recent environmental protection trend. In addition, no lifting occurs even in solvent-type finish coating materials. To reduce the
An object of the present invention is to establish an excellent coating finish method in which a surface finish coating material is not affected even by cracking or expansion / contraction of a coating object.

[0011]

In order to solve such a problem, the present inventors use an aqueous synthetic resin emulsion having a specific monomer composition and a surfacer containing a specific aqueous latex containing chlorine. With this in mind, the present invention has been completed. That is, the present invention provides: On the surface of the object to be coated or the existing coating surface of the surface of the object
(A) It contains an alkyl acrylate and / or an alkyl methacrylate, does not contain other functional group monomers, and has a glass transition temperature (hereinafter, referred to as Tg) of-.
Aqueous synthetic resin emulsion characterized by being at 20 ° C. to 10 ° C., (B) containing vinyl chloride, vinylidene chloride, alkyl acrylate and / or alkyl methacrylate, containing no other functional group monomer, and having a weight average molecular weight Is a vinylidene chloride-based aqueous latex having a molecular weight of 30,000 to 200,000, an inorganic powder (C) having a solid content of (B) of 5 to 40 parts by weight with respect to 100 parts by weight of a solid content of (A), and (A) and (B) are mixed so that the chlorine amount becomes 2.5 to 15.0% by weight based on the solid content weight, and the pigment volume concentration (hereinafter, referred to as PVC) is 15.
A paint finishing method, further comprising applying a finish coating material after applying a surfacer mixed with (C) so as to be 60% or less. 2. The functional monomer of (A) and (B) is characterized by containing not more than 5% by weight of either or both of a hydroxyl group-containing monomer and a carboxyl group-containing monomer. The paint finishing method described. 3. 1. The hydroxyl group-containing monomer is 2-hydroxyethyl methacrylate. The paint finishing method described in 1. 4. (B) The ratio of vinyl chloride to vinylidene chloride is 1
00:20 to 100: 180. From 3. The method for finishing coating according to any one of the above. 5. The finish coating material is a water-based silicone-modified acrylic paint containing cycloalkyl acrylate and / or cycloalkyl methacrylate. From 4. The method for finishing a super-weatherproof aqueous coating according to any one of the above. 6. The finish coating material is a non-staining paint containing an alkyl silicate. From 4. The method for finishing a non-contaminated coating according to any one of the above. 7. The existing coating film is an elastic coating material having an elongation of 50 to 500%. From 6. The refinish finish coating method according to any of the above. 8. The existing coating film is made of a non-crosslinked type one-pack type synthetic resin, and the finish coating material is a solvent type. From 4. Refinishing method according to any of the above.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The aqueous synthetic resin emulsion (A) of the present invention (hereinafter referred to as the component (A)) contains an alkyl acrylate and / or an alkyl methacrylate as a constituent monomer. Here, as the alkyl acrylate, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-pentyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-methylpentyl acrylate, n-octyl acrylate, 2- Ethylhexyl acrylate, n-
Decyl acrylate, n-dodecyl acrylate, n-
One or more selected from octadecyl acrylate and the like, as alkyl methacrylate, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-pentyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, 2-methyl One or more selected from pentyl methacrylate, n-octyl methacrylate, 2-ethylhexyl methacrylate, n-decyl methacrylate, n-dodecyl methacrylate, n-octadecyl methacrylate and the like can be used. In addition, known monomers such as styrene can be appropriately used within a range that does not impair the effects of the present invention.

In the present invention, the Tg is -20.degree. C. in order to exhibit a sufficient function as an undercoating material even when an elastic coating film is present on the object to be coated or on the surface thereof.
It is necessary that the temperature be 10 ° C. to 10 ° C., and particularly for such a purpose, it is desirable to contain 2-ethylhexyl acrylate. At this time, when Tg is lower than −20 ° C., when a hard material is used as the finish coating material, cracks are generated in the finish coating material. When the surfacer according to the present invention is used, cracks occur in the coating film itself.

Next, the component (A) in the present invention is characterized in that it does not contain a functional group monomer. Such a functional group monomer is conventionally used for improving the physical properties of a film formed from an aqueous synthetic resin emulsion. , Which has been actively used. In the present invention, it has been found that an aqueous synthetic resin emulsion containing such a functional group monomer has rather narrowed the suitability as an undercoat material. Such a functional monomer includes, as described above, a glycidyl group and a carboxyl group, a hydrazide group and a carbonyl group, an epoxy group and an amino group, a hydroxyl group and a carboxyl group, a tertiary amine-epichlorohydrin adduct that self-condenses, Weakly reactive isocyanates and amino groups,
Carboxyl group and aziridine group, self-condensing alkoxysilyl group, carboxyl group and carbodiimide group, acetoacetate group and ketimine group, ester group and amino group having hetero atom at α-position, etc., and improvement of stability of aqueous synthetic resin emulsion And the like used for this purpose.

However, since the reactivity between a carboxyl group and a hydroxyl group is not so high, it is not possible to contain a hydroxyl group-containing monomer, a carboxyl group-containing monomer, or both alone as a functional group monomer in an amount of 5% by weight or less. Permissible. Further, by containing these monomers, the sealing property of the solvent is improved. Examples of such a hydroxyl group-containing monomer include 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and hydroxypropyl methacrylate, and examples of the carboxyl group-containing monomer include acrylic acid and methacrylic acid. Among them, particularly, 2-hydroxyethyl methacrylate can make the surface of a film formed from an aqueous synthetic resin emulsion using the same hydrophilic without relatively lowering the water resistance, so that the sealing property of the solvent is further improved. This has the effect.

The method for producing the component (A) can be carried out by emulsion polymerization, which is a general method for producing an emulsion, and is not particularly limited. The molecular weight of the produced aqueous synthetic resin emulsion is also not particularly limited, but a high molecular weight such that a film formed from such an aqueous synthetic resin emulsion is not easily dissolved in a solvent such as toluene. It is necessary to be. Therefore, as a guide, it is desirable that the weight average molecular weight is 300,000 or more. The weight average molecular weight in the present invention is a value measured by GPC (gel permeation chromatography) and converted into polystyrene.

Next, the vinylidene chloride-based aqueous latex (B) (hereinafter referred to as the component (B)) comprises vinyl chloride,
Except for using vinylidene chloride as a copolymerization monomer, the same copolymerization monomer as the component (A) described above is used, and the use of the same functional group monomer is allowed.

The method for producing the component (B) is also as follows:
As described above, it is possible to use a method such as emulsion polymerization. However, in consideration of the stability of the latex, it is preferable to perform seed polymerization in which only a copolymer monomer excluding vinyl chloride and vinylidene chloride is first polymerized as a seed polymer.

The molecular weight of component (B) must be in the range of 30,000 to 200,000 in terms of weight average molecular weight. When the molecular weight is smaller than 30,000, the solvent resistance is insufficient. In particular, when a two-pack reaction hardening type finish coating material is used, the surface of the surfacer itself is redissolved. The application does not cause any particular problem, but in the case of recoating after curing of the finish coating material, the first finish coating material coating film causes a lifting phenomenon. 200,000
When it is larger, it is difficult to stably produce the component (B) by a general polymerization method.

In the present invention, (A)
The component (B) and the component (C) to be described later are mixed. First, the mixing ratio of the components (A) and (B) is (A)
The solid content of the component (B) is 5 to 40 parts by weight based on 100 parts by weight of the solid content of the component. At this time, the amount of chlorine is 2.5 to 15.0% by weight based on the total weight of the resin solids.
It is necessary to be. By using such an amount of chlorine, an object to be coated having elasticity, or an existing coating on the surface of the object to be coated, exhibiting excellent adhesion including an elastic coating film and a finishing coating material including an elastic coating material. It is. When the solid content of the component (B) is less than 5 parts by weight, the effect of adhesion is insufficient because the chlorine content is less than the above range, and the solid content of the component (B) is less than 40 parts by weight. When the amount is large, the chlorine amount exceeds the upper limit and discoloration due to chlorine occurs, and even when the chlorine amount is within the specified range, the relative ratio of the component (B) having a lower molecular weight as compared with the component (A). Is increased, and as a result, the sealing property of the solvent is reduced.

Here, in the component (B), the ratio of vinyl chloride to vinylidene chloride is 100: 20 to 100: 1.
Preferably, it is 80. This is because when vinyl chloride is less than 100: 180, vinylidene chloride is relatively increased, and as a result, Tg of the component (B) is increased,
This is because, when the surfacer of the present invention is used for a substrate having elasticity, cracks will be generated in the coating film itself. Also, when the vinyl chloride content is greater than 100: 20, the vinylidene chloride content is relatively small,
In the component (B), the amount of chlorine per unit weight is relatively small. Therefore, as described above, the amount of chlorine contained in the resin solid content in the surfacer is 2.5 to 15.0 in order to improve adhesion. In order to make the weight%, the blending amount of the component (B) increases. This causes an increase in the relative ratio of the component (B) having a lower molecular weight as compared with the component (A), and as a result, the sealing property of the solvent is reduced.

Next, the inorganic powder of (C) is heavy calcium carbonate, kaolin, clay, clay, china clay, diatomaceous earth, white carbon, talc, barite, precipitated barium sulfate, barium carbonate, silica sand, quartz Powder, wollastonite and the like. Further, known coloring pigments can also be used. In the present invention, such (A),
In producing a surfacer in which the components (B) and (C) are mixed, the mixing ratio of the component (C) is 15-60 PVC.
Adjust to be%.

The surfacer of the present invention includes, in addition to the above,
It is possible to mix various additives that can be mixed with the coating material to such an extent that the effects of the present invention are not affected. Such additives include plasticizers, preservatives, fungicides, anti-algal agents, defoamers, leveling agents, dispersants, anti-settling agents, anti-sag agents, film-forming auxiliaries, thickeners, Adjusting agents, drying adjusting agents and the like.

The finish coating material used in the present invention is not particularly limited. For example, JIS A6021 (1995) roof coating waterproofing material, JIS A6909 (1995) architectural finish coating material, JIS K5654 (19)
92) Acrylic resin enamel, JIS K5656 (1992) Architectural polyurethane resin paint, JIS K5658 (1992) Fluorine resin paint for architecture, JIS K5660 (1995) Tsuya synthetic resin emulsion paint, JIS K5663 (1995) Synthetic resin emulsion paint, JIS K5667 (1995) Colorful paint, JIS K5668 (199
5) Synthetic resin emulsion pattern paints and the like are listed.

In particular, a finish coating material having physical properties specified in JIS K5658 (1992) fluororesin paint for construction, or a silicon-modified acrylic resin paint containing a hydrolyzable silyl group (commonly called acrylic silicone paint) was used. In such a case, in combination with these effects of the super-weather-resistant finish coating material, a process-shortened ultra-weather-resistant coating method using a surfacer and a super-weather-resistant finish material is provided.

In the case of using a water-based finishing material having physical properties defined by one type of weathering type of a multi-layered finishing material in JIS A6909 (1995) for architectural finishing materials, the surfacer and the super weatherproof It becomes a complete water-based coating method of a process shortening type using a water-based finishing material. An example of such a super-weather-resistant paint is as follows.

Ultra-weather resistant paint (D) Polymerizable monomer having (D) cycloalkyl acrylate and / or cycloalkyl methacrylate as main component (E) Alkoxysilane compound (F) (Meth) acrylic acid having chain alkyl group An ultra-weather-resistant aqueous finish paint containing an aqueous resin dispersion obtained by emulsion polymerization of an alkyl ester monomer (G) and other polymerizable monomers.

The components will be described below. (D) a polymerizable monomer having cycloalkyl acrylate and / or cycloalkyl methacrylate (D) a polymerizable monomer having cycloalkyl acrylate and / or cycloalkyl methacrylate (hereinafter, referred to as
(D) It is called a component. ) Is an essential component for imparting excellent weather resistance, discoloration resistance, crack resistance, water resistance, gloss and gloss retention to the obtained ultra-weather-resistant water-based paint, and examples thereof include cyclopentyl acrylate and cyclopentyl. Methacrylate, cyclohexyl acrylate,
Cyclohexyl methacrylate, methylcyclohexyl acrylate, methylcyclohexyl methacrylate,
t-butylcyclohexyl acrylate, t-butylcyclohexyl methacrylate, cyclooctyl acrylate, cyclooctyl methacrylate, cyclododecyl acrylate, cyclododecyl methacrylate, and the like, and one or more of these can be used.

(E) Alkoxysilane Compound The (E) alkoxysilane compound (hereinafter referred to as “component (E)”) provides excellent weather resistance to the resulting aqueous resin dispersion.
It is an essential component for providing gloss retention, water resistance, and excellent adhesion to inorganic substrates. Vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tris (β-methoxy ethoxy) silane, vinyl methyl dimethoxy silane Γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-acryl Loxypropylmethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β
-(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, N- (β
-Aminoethyl) -γ-aminopropyltrimethoxysilane, and one or two of these.
More than one species can be used.

(F) Alkyl (meth) acrylate monomer having chain alkyl group (F) Alkyl (meth) acrylate monomer having chain alkyl group (hereinafter referred to as component (F)) For example, methyl (meth) acrylate, ethyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, t-butyl (meth) acrylate,
Examples thereof include 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, and stearyl (meth) acrylate, and one or more of these can be used.

(G) Other polymerizable monomers (G) Other polymerizable monomers (hereinafter referred to as component (G)) include, for example, (meth) acrylic acid, itaconic acid, fumaric acid, Maleic acid, ethylenically unsaturated carboxylic acids such as crotonic acid, styrene, α-methylstyrene, aromatic vinyl compounds such as vinyltoluene, (meth) acrylamide, ethylenically unsaturated carboxylic acid alkylamides such as N-methylolacrylamide, Carboxylic acid vinyl esters such as vinyl acetate and vinyl propionate; ethylenically unsaturated carboxylic acid aminoalkyl esters such as aminoethyl acrylate, dimethylaminoethyl acrylate and butylaminoethyl acrylate; aminoethyl acrylamide; dimethylaminomethyl methacrylamide; methylaminopropyl Examples include ethylenically unsaturated carboxylic acid aminoalkylamides such as pill methacrylamide, vinyl cyanide monomers such as (meth) acrylonitrile and α-chloroacrylonitrile, and unsaturated aliphatic glycidyl esters such as glycidyl (meth) acrylate. And one or more of these can be used.

On the other hand, recently, since a coating film formed from a synthetic resin paint containing an alkyl silicate becomes hydrophilic on the surface, even if lipophilic pollutants in the air adhere to the water droplets, the raindrops cause water droplets to form. It has become known to infiltrate into the gap between the film and the coating film, thereby floating and washing away the contaminants. Use of such an alkyl silicate-containing paint as a finish coating material results in a non-contamination coating finish method with a shortened process. An example of such a non-staining paint is as follows.

Non-staining paint composition (H) Polyol (I) Alkoxysilane compound containing alkylene oxide chain (J) Alkyl silicate and / or condensate thereof (K) Polyisocyanate

Non-staining paint composition (L) Fluorine-containing copolymer (I) Alkoxysilane compound containing alkylene oxide chain (J) Alkyl silicate and / or condensate thereof (K) Polyisocyanate .

Non-staining paint composition (M) Hydrolyzable alkoxysilyl group-containing acrylic copolymer (I) Alkoxysilane compound containing alkylene oxide chain (J) Alkyl silicate and / or condensate thereof thing.

The components will be described below. (H) Polyol The polyol (H) (hereinafter referred to as the (H) component) is
It means an oligomer polyol generally used in the polyurethane technical field, and becomes a main component of a coating material of a finishing material by mixing and reacting with a polyisocyanate as a curing agent. This polyol includes polyether polyol, polyester polyol, acrylic polyol and the like.

(I) Alkoxysilane Compound Containing Alkylene Oxide Chain (I) An alkoxysilane compound containing an alkylene oxide chain (hereinafter referred to as “component (I)”) comprises a repeating unit of an alkylene oxide group and at least one or more alkylene oxide groups. It is a compound having an alkoxysilyl group. In the component (I), both terminals may be alkoxysilyl groups, one end may be an alkoxysilyl group, and the other end may be another functional group. Examples of such a functional group that can be present at one terminal include a vinyl group, a hydroxyl group, an epoxy group, an amino group, an isocyanate group,
And a mercapto group. The functional group may be bonded to an alkoxysilyl group via a urethane bond, a urea bond, a siloxane bond, an amide bond, or the like. As the component (I), for example, a compound synthesized by reacting a compound containing a polyalkylene oxide chain with a compound containing an alkoxysilyl group (hereinafter, referred to as a coupling agent) can be used.

Examples of the polyalkylene oxide chain-containing compound include polyethylene glycol, polyethylene-propylene glycol, polyethylene-tetramethylene glycol, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether,
Polyoxyethylene diglycolic acid, polyethylene glycol vinyl ether, polyethylene glycol divinyl ether, polyethylene glycol allyl ether,
And polyethylene glycol diallyl ether. The polyalkylene oxide chain-containing compound can be selected from one kind or a combination of two or more kinds.

On the other hand, the coupling agent is, for example, a compound having at least one or more alkoxysilyl groups and other substituents in one molecule. Specific examples of the coupling agent include β- (3,4 epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, and N-β (Aminoethyl) γ-aminopropylmethyldimethoxysilane, N-
β (aminoethyl) γ-aminopropylmethyltrimethoxysilane, γ-aminopropyltrimethoxysilane,
Examples include γ-aminopropyltriethoxysilane, isocyanate-functional silane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, and γ-methacryloxypropyltriethoxysilane.

(J) Alkyl silicate (J) Alkyl silicate and / or a condensate thereof (hereinafter referred to as component (J)) may be, for example, tetramethyl silicate, tetraethyl silicate, tetra-n
One or more selected from -propyl silicate and tetra-i-propyl silicate, and examples of the condensate include one or more selected from those obtained by condensing the above tetraalkyl silicate under hydrolysis conditions. Can be
In particular, use of at least one of tetramethyl silicate and tetraethyl silicate or a condensate thereof is preferred from the viewpoint of the balance between flexibility and denseness of the formed coating film.

(K) Isocyanate (K) Isocyanate (hereinafter referred to as component (K))
Are toluene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (pure-MD
I), polymeric MDI, xylylene diisocyanate (XDI), hexamethylene diisocyanate (HM)
DI), isophorone diisocyanate (IPDI), hydrogenated XDI, hydrogenated MDI, etc., with isocyanate monomers such as allohanate, biuret, dimerization (uretidione), 3
In addition to quantification (isocyanurate), adduct formation, and carbodiimide reaction, those derivatized by a reaction with polyester polyol or caprolactam and the like, and mixtures thereof can be used.

(L) Fluorine-containing copolymer (L) Fluorine-containing copolymer (hereinafter, referred to as component (L))
Generally encompasses all fluorine-containing resins having a hydroxyl group, which are generally used in cold-setting fluororesin paints. The fluorinated copolymer is obtained by copolymerizing a fluorine monomer and a copolymerized monomer. Examples of the fluorine monomer include tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene, vinylidene fluoride, vinyl fluoride, and trifluoroethylene. Ethylene and the like. As the copolymerization monomer, a vinyl monomer is used.

(M) Alkoxy Silyl Group-Containing Acrylic Copolymer (M) Alkoxy silyl group-containing acrylic copolymer (hereinafter referred to as component (M)) contains at least one hydrolyzable alkoxysilyl group per molecule. And preferably two or more. This alkoxysilyl group is
The component (M) may be contained in the terminal or side chain of the main chain, or may be contained in both components. The component (M) can be obtained from a copolymer of an acrylic monomer such as acrylic acid, methacrylic acid, or a derivative thereof, and an alkoxysilyl group-containing monomer.

In the non-staining paint composition used in the present invention, it is possible to incorporate pigments and various additives that can be usually added to the paint to such an extent that the effects of the present invention are not affected. Examples of such additives include plasticizers, preservatives, fungicides, anti-algal agents, defoamers, leveling agents, pigment dispersants, anti-settling agents, anti-sag agents, matting agents, ultraviolet absorbers and the like. can give.

In addition, a catalyst for hydrolysis / condensation of (N) alkoxysilyl group (hereinafter, referred to as (N) component) can be added to the non-staining paint composition.
Specific examples of the (N) component include organic tin compounds such as dibutyltin dilaurate, dibutyltin dimaleate, dioctyltin dilaurate, dioctyltin dimaleate, tin octylate, phosphoric acid, monomethyl phosphate,
Phosphate esters such as monoethyl phosphate, monobutyl phosphate, monooctyl phosphate, monodecyl phosphate, dimethyl phosphate, diethyl phosphate, dibutyl phosphate, dioctyl phosphate and didecyl phosphate, propylene oxide, butylene oxide, cyclohexene oxide,
Glycidyl methacrylate, glycidol, acrylic glycidyl ether, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, epoxy compound and phosphoric acid and / or monoacid phosphorus Addition reaction products with acid esters, maleic acid, adipic acid, azelaic acid, sebacic acid, itaconic acid, citric acid, succinic acid, phthalic acid, trimetic acid, pyrometic acid, acid anhydrides thereof, p-toluenesulfonic acid, etc. And acidic compounds of Also included are mixtures or reactants of these acidic catalysts with amines. For example, hexylamine, N.P. Examples include amines such as N-dimethyldodecylamine and dodecylamine.

The procedure of the coating method of the present invention is to apply (A), (B), and (C) directly to the object to be coated in the case of new construction, or to the existing coating on the surface of the object in the case of renovation and renovation. The surfacer to be contained is applied by spraying with a spray or by a roller, and then a finish coating material is applied. In this case, it is desirable to apply the surfacer in an amount of about 300 to 2000 g / m2. At this time, by adjusting the amount of the surfacer to be applied, it is possible to finish the coating while leaving the concavo-convex pattern of the existing coating film. Furthermore, the surfacer may itself be a method of forming a texture of a concavo-convex pattern, and applying a finish coating material thereon. In such a method, in the case of spraying, after performing smooth coating, it is performed by a method of coating in a ball shape, and in the case of a roller, the coating is performed by a pattern roller or the like.

On the other hand, the coating amount and coating specifications of the finishing coating material may be in accordance with the standard specifications of each finishing coating material. In particular, when the above-mentioned super weather-resistant finishing coating material or non-staining paint is used, In addition, the excellent physical properties of these finish coating materials are sufficiently exhibited even on the surface of an aqueous surfacer.

The coating method of the present invention can be applied to a modified coating in which an existing coating film is present on the surface of an object to be coated. In the case of such refurbishment or refurbishment, the existing coating film may be of various types, but the coating method of the present invention can be applied regardless of the type. In particular, the elongation rate, which is a problem of the conventional aqueous surfacer, is 50 to 500.
%, Even in the case where there is an existing coating film having elasticity such as%. This is JIS A6021 (199
5) Waterproof coating material for roof, JIS A6909 (1995) Waterproof thin coating material E for construction finish coating material, JIS A6909 (1995) Elastic coating material such as waterproof multi-layer coating material E for construction finish coating material The same applies to the case where the coating is applied. When such a finishing material is used, a comprehensive elastic waterproof coating film is formed.

Further, when the existing coating film is made of a non-crosslinked type one-pack type synthetic resin, the lifting phenomenon due to the solvent type finish coating material which is a problem of the conventional aqueous surfacer does not occur. Irrespective of the type, a solvent type finish coating material can be freely selected for painting. Therefore, there is an advantage that even when a solvent type finish coating material has to be used due to environmental conditions and demands for weather resistance, the base preparation and the undercoat material can be made of one material and can be applied in an aqueous system.

[0050]

According to the coating finishing method of the present invention, a high-molecular-weight aqueous acrylic synthetic resin emulsion containing no functional group monomer or containing at most 5% by weight of either a hydroxyl group or a carboxy group is obtained. Since a surfacer mixed with a vinylidene chloride aqueous latex containing no functional group monomer or containing 5% by weight or less of either a hydroxyl group or a carboxyl group is used, the polarity of chlorine It adheres well to the surface of various coating materials and has excellent adhesion to the aqueous elastic finishing coating material, which is prone to peeling, and the aqueous synthetic resin emulsion and vinylidene chloride aqueous latex particles have an appropriate distribution state. Because it is difficult to dissolve itself by the solvent type finish coating material, even if the existing coating and the surface of the object to be coated are dissolved, It appears to form a coating film having conformability to these.

[0051]

【Example】

(Example 1) Using the raw materials shown in Table 1, additives such as a dispersant, a film-forming aid, a thickener, and an antifoaming agent were added as in the basic formulation shown in Table 2, A surfacer was manufactured by the same manufacturing method as that of a normal paint. Using this surfacer, the finish coating materials shown in Table 3 were laminated and applied in combinations as shown in Table 4, and the following tests were carried out. As a result, the finish coating material was a solvent type two-pack reaction hardening type urethane resin enamel. Nevertheless, no lifting was generated and the appearance of the coating film was good. In addition, the initial adhesion was excellent, and no abnormality was observed in the resistance test for the repeated action of heating and cooling.

(Method of preparing test piece) 300 × 300 × 6 m
m, the existing coating films shown in Table 3 were applied as shown in Table 4 in the following manner.

(A) Application of existing coating film In the case of one-component solvent type acrylic resin enamel "SK Acrylic Color" (manufactured by SK Kaken Co., Ltd.), brush coating is performed at a coating amount of 200 g / m 2, and then at room temperature.
After curing for a period of time, brushing was applied again at a coating amount of 200 g / m 2, followed by drying and curing at room temperature for 7 days.

Waterproof exterior synthetic resin emulsion-based thin finish coating material (generic name: single-layer elastic coating material) "Elastic Topless Soft" (manufactured by SK Chemical Co., Ltd.) One-component solvent-type chlorinated rubber sealer "EX""Sealer" (manufactured by SK Kaken Co., Ltd.) with a coating amount of 200 g / m2, and after drying at room temperature for 2 hours, "Elastic Topless Soft"
Was applied twice using a wool roller at a coating amount of 800 g / m @ 2 and an interval time of 4 hours in the process, and then dried and cured at room temperature for 7 days.

(B) Coating of the surfacer Each of the surfacers of Formulation Examples 1 to 9 in Table 2 was applied to the coated surface of the coated plate thus prepared at a coating amount of 1 kg / After spray coating at m2, the film was dried and cured at room temperature for 24 hours.

(C) Coating of finish coating material Further, the finished coating material shown in Table 3 was applied to the prepared coated plate in Table 4.
Was painted in the following manner, like the combination of

In the case of a solvent-type two-pack reaction-curable urethane resin enamel "Urethane Color" (manufactured by SK Chemical Co., Ltd.), brush-coat at a coating amount of 150 g / m2, dry cure at room temperature for 2 hours, and apply further. Brush with a quantity of 150 g / m2,
Cured at normal temperature for 24 hours.

In the case of a waterproof type exterior synthetic resin emulsion-based thin finish coating material (generic name: single-layer elastic coating material) "New Top Rescreen" (manufactured by SK Kaken Co., Ltd.) "New Top Rescreen" without using a base coating material Directly
The coating was performed twice using a wool roller at a coating amount of 800 g / m 2 and an interval time in the process of 4 hours, and dried and cured at room temperature for 7 days. In the case of one-component solvent-type acrylic resin enamel "SK Acrylic Color" (manufactured by SK Chemical Co., Ltd.), brush with 200 g / m2 of coating amount, and then apply
After curing for a period of time, brushing was applied again at a coating amount of 200 g / m 2, followed by drying and curing at room temperature for 7 days.

(Evaluation Method) (1) Lifting (Initial) After the finish coating material was applied, it was dried at room temperature for 24 hours, and the occurrence of lifting was visually observed. (○: no lifting, ×: lifting) (2) Initial adhesion After applying the finish coating material, dry at room temperature for 48 hours, immerse in warm water of 50 ° C for 24 hours, pull up and dry at room temperature, taping test (JIS K 5400 8.5.2 grid tape method) It was confirmed whether the finish coating material was peeled off. (○: no peeling, ×: peeling) (3) Recoatability (implemented only in Examples 5, 6, 7 and Comparative Example 6) After applying a finish coating material, the same finish was applied to a test specimen that was dried at room temperature for 1 week at room temperature. The coating material “urethane color” (manufactured by SK Chemical Co., Ltd.) was brush-coated at a coating amount of 150 g / m 2, cured at room temperature for 2 hours, further brush-coated at a coating amount of 150 g / m 2, and cooled at room temperature. For 24 hours, and the occurrence of lifting was visually observed. (○: no lifting, ×:
(4) Resistance to repeated action of heating and cooling (JIS A 6909 (199
5) Conform to 6.11) After the finish coating material is applied and dried at room temperature for 7 days, the test specimen is immersed in water at 20 ± 2 ° C for 18 hours, and then immediately cooled to −20.
After cooling in a thermostat at ± 3 ° C. for 3 hours, and then heating in another thermostat at 50 ± 3 ° C. for 3 hours, this cycle of 24 hours was repeated 10 times and then returned to the test room. After standing for 2 hours, the coating film is visually inspected for peeling, cracking and blistering. (O: No peeling, no cracking, no blistering,
×: Any of peeling, cracking and blistering)

(Examples 2 and 3) A surfacer was produced using the raw materials shown in Table 1 and in the composition shown in Table 2. Using this surfacer, the finish coating materials shown in Table 3 were applied in combinations as shown in Table 4, and evaluations were made in the same manner as in Example 1. As a result, as shown in Table 5, Example 1
In the same manner as in Example 1, the finishing coating material did not generate lifting at all, and showed a good appearance of the coating film despite the solvent-type two-component reaction-curable urethane resin enamel. In addition, the initial adhesion was excellent, and no abnormality was observed in the resistance test for the repeated action of heating and cooling.

Example 4 Using the raw materials shown in Table 1, a surfacer was produced with the composition shown in Table 2.
Using this surfacer, the non-staining paint shown in Table 3 was applied in a combination as shown in Table 4 and evaluated in the same manner as in Example 1. As a result, as shown in Table 5, despite the use of the aqueous single-layer elastic coating material as the finish coating material, no abnormality was observed in the resistance test against the repeated action of heating and cooling, and the adhesiveness was excellent. I understand.

(Examples 5, 6, 7) Using the raw materials shown in Table 1, a surfacer was produced in the composition shown in Table 2. Using this surfacer, the finish coating material shown in Table 3 was applied in a combination as shown in Table 4, and after checking the presence or absence of lifting, the “urethane color” of the finish coating material 2 for the recoat test was further confirmed. SK Chemicals Co., Ltd.)
After confirming the lifting by recoating,
Initial adhesion and resistance test to repeated action of heating and cooling were performed. As a result, as shown in Table 5, none of the test specimens exhibited initial adhesion and lifting due to recoating.
In addition, no abnormality was found in the initial adhesion and the resistance test against the repeated action of heating and cooling.

Example 8 Using the raw materials shown in Table 1, a surfacer was produced with the composition shown in Table 2.
Using this surfacer, the following super-weather-resistant paint and the paint shown in Table 3 were applied in a laminate as shown in Table 4, and a test was conducted in the same manner as in Example 1. As a result,
As shown in Table 5, the existing coating film was formed of an aqueous single-layer elasticity (elongation of 37).
Despite swelling and peeling, it shows sufficient adhesion despite the fact that the finish coating material is water-based and super-weather-resistant. did. The super-weatherproof paint was manufactured by the following method.

* Method for producing super-weather resistant paint * 65 parts of cyclohexyl methacrylate, 10 parts of γ-methacryloxypropyltrimethoxysilane, 23 parts of 2-ethylhexyl acrylate, 2 parts of acrylic acid, Eleminol JS-2 [manufactured by Sanyo Chemical Co., Ltd.] , Reactive emulsifier] 10
Parts, 0.5 part of t-butylperoxy (2-ethylhexanoate), 54 parts of water and 6 parts of methanol were added, and the mixture was stirred and emulsified. A dispersion containing the body was prepared. Next, 63 parts of water and 7 parts of methanol were charged into a reaction vessel equipped with a stirrer, a reflux condenser, a dropping funnel, a nitrogen inlet, and a thermometer, and the temperature was raised to 80 ° C. while stirring. The dispersion containing the monomer was dropped into the above reaction vessel over 4 hours to carry out a reaction. During the dropwise addition, the reaction was carried out at 80 ° C. while introducing nitrogen, and the pH was maintained at 6 to 8 by appropriately adding a 25% aqueous solution of ethylamine.
After completion of the dropwise addition, aging was performed for 2 hours, and the mixture was cooled to room temperature to obtain an aqueous resin dispersion. Next, a super-weatherproof paint using the obtained aqueous resin dispersion as a binder was prepared with the following composition. Aqueous dispersion 67.0 parts Titanium oxide paste (70%) 29.3 parts Texanol 2.7 parts Thickener (polyacrylic acid type) 0.5 parts Antifoaming agent (silicone type) 0.5 parts合計 100.0 parts in total Also, this laminated super weather resistant coating film was JIS A 6909 (1995)
When tested by the weather resistance B method, it was found that it had the performance of one type of weather resistance.

Example 9 Using the raw materials shown in Table 1, a surfacer was produced in the composition shown in Table 2.
Using this surfacer, the following non-staining paints and Table 3
Using the paint shown in Table 2, the coating was carried out in the form of a combination as shown in Table 4, and a test was conducted in the same manner as in Example 1. As a result, as shown in Table 5, despite the finish coating material forming a solvent-based hard coating, there was no lifting and no cracking, and the effect of the non-staining paint was a one-part solvent coating of the existing coating. A surface with excellent non-staining properties, which cannot be obtained with an acrylic resin enamel, was formed. The non-staining paint was manufactured by the following method.

* Method for producing non-contaminated paint * (Synthesis of coupling agent containing polyalkylene oxide chain) A polyethylene glycol 200 (weight average molecular weight 200) was placed in a reaction vessel equipped with a heating device, a stirrer, a reflux device, a dehydration device, and a thermometer. : 20 parts by weight, manufactured by Wako Pure Chemical Industries, Ltd.), 54.3 parts by weight of Y-9030 (manufactured by Nippon Unicar Co., Ltd.), which is an isocyanate-containing silane, and 0.05 part by weight of dibutyltin laurylate. For 8 hours to obtain a pale yellow polyethylene oxide chain-containing coupling agent. The weight average molecular weight of this polyethylene oxide chain-containing coupling agent was 800 as measured by gel permeation chromatography (hereinafter referred to as GPC) in terms of polystyrene.

(Blending) Weight average molecular weight: 30,000, hydroxyl value: 40 KOH mg / g, monomer composition: methyl methacrylate / n-butyl acrylate / styrene / 2-hydroxyethyl methacrylate. Parts by weight, 6 parts by weight of the polyethylene oxide chain-containing coupling agent shown in Synthesis Example, and methyl silicate 2 having a weight average molecular weight of 500.
0 parts by weight and 84 parts by weight of titanium oxide were uniformly kneaded to prepare a base material of a white paint. OH / NCO
Hexamethylene diisocyanate having an NCO ratio of 23.1% is converted to a solid content of 15.1 so that the ratio becomes 0.9.
By adding 0 parts by weight, a non-staining paint was obtained.

The laminated non-contaminated coating film had a surface hardness of 2H (JIS K 5400 (1990) 8.4 pencil scratch value), and was exposed outdoors at a 45 ° southward inclination in Ibaraki City, Osaka Prefecture. The lightness difference between the initial and six months later (ΔL
Value) was measured using a TC-1800 type color difference meter manufactured by Tokyo Denshoku Co., Ltd., showing a value of -1.0 to -2.0,
Excellent stain resistance.

(Comparative Example 1) A surfacer was produced using the raw materials shown in Table 1 and in the composition shown in Table 2.
Using this surfacer, the finish coating materials shown in Table 3 were laminated and applied in combinations as shown in Table 4 and tested in the same manner as in Example 1. As shown in Table 5, the existing coating film was coated as shown in Table 5. ,
A one-component solvent-type acrylic resin enamel. Since the aqueous synthetic resin emulsion 3 of the surfacer contains a functional group monomer (acrylamide), the surfacer is lifted by the solvent of the solvent-type two-component reaction-curable urethane resin enamel of the finishing coating material. Awakened.

(Comparative Example 2) A surfacer was produced using the raw materials shown in Table 1 and in the composition shown in Table 2.
Using this surfacer, the finish coating materials shown in Table 3 were laminated and applied in combinations as shown in Table 4 and tested in the same manner as in Example 1. As shown in Table 5, the existing coating film was coated as shown in Table 5. ,
It is a one-component solvent-type acrylic resin enamel, and the vinylidene chloride-based latex 3 of the surfacer contains a functional group monomer (acrylamide).
The surfacer has lifted.

(Comparative Example 3) A surfacer was produced using the raw materials shown in Table 1 and in the composition shown in Table 2.
Using this surfacer, the finish coating materials shown in Table 3 were laminated and applied in combinations as shown in Table 4 and tested in the same manner as in Example 1. As shown in Table 5, the finish coating materials were as shown in Table 5. ,
Due to the aqueous single-layer elasticity (elongation of 392%), the finish coating material film was peeled off in a taping test after immersion in warm water at 50 ° C. for 24 hours.

(Comparative Example 4) A surfacer was produced using the raw materials shown in Table 1 and in the composition shown in Table 2.
Using this surfacer, the finish coating materials shown in Table 3 were laminated and applied in combinations as shown in Table 4 and tested in the same manner as in Example 1. As shown in Table 5, there was a problem with the lifting properties. However, the PVC of the surfacer was high, the coating film was too hard, and the existing coating film had an aqueous single-layer elasticity (elongation of 373%), and cracks occurred in both the surfacer and the finish coating material film.

(Comparative Example 5) Using the raw materials shown in Table 1, a surfacer was produced in the composition shown in Table 2.
Using this surfacer, the finish coating materials shown in Table 3 were laminated and applied in combinations as shown in Table 4. At this time, the first finish coating material was applied and a test was performed in the same manner as in Example 1. As a result, no lifting occurred. Thereafter, the test specimen was dried and cured for one week, and then a solvent-based two-pack reaction-curable urethane resin enamel “Urethane Color” (manufactured by SK Chemical Co., Ltd.) of the finishing coating material 2 was applied at a coating amount of 150 g /
After brushing at m2, drying and curing at room temperature for 2 hours, brushing at a coating amount of 150 g / m2 and curing at room temperature for 24 hours, the same test as in Example 1 was carried out. As described above, since the molecular weight of the vinylidene chloride-based latex 4 of the surfacer was low, the surfacer was redissolved, and lifting of the first finish coating material film occurred. That is, it was found that the recoating property was poor.

(Comparative Example 6) Using the raw materials shown in Table 1, a surfacer was produced with the composition shown in Table 2.
Using this surfacer, 300 × 300 × 6mm
The finish coating material shown in Table 3 was applied to the flexible board of
Were applied in a combination as described above. At this time, the first finish coating material was applied and a test was performed in the same manner as in Example 1. As a result, no lifting occurred. Then, after the test specimen is dried and cured for one week, the solvent type two-pack reaction hardening type urethane resin enamel “urethane color” of the finishing coating material 2 is used.
(Manufactured by SK Chemical Co., Ltd.) at a coating amount of 150 g / m 2, dried and cured at room temperature for 2 hours, further brushed at a coating amount of 150 g / m 2, and cured at room temperature for 24 hours. When a test was conducted in the same manner as in Example 1, as shown in Table 5, a vinylidene chloride-based latex 4 of a surfacer was obtained.
Due to its low molecular weight, the surfacer was redissolved and lifting of the first finish coating film occurred. That is, it was found that the recoating property was poor.

[0075]

[Table 1]

[0076]

[Table 2]

[0077]

[Table 3]

[0078]

The effect of the present invention is that the surfacer used in the present invention has both the effect of a base adjustment material and the effect of a sealer, as well as the conventional solvent type and aqueous surfacer, and the surface of the conventional solvent type. This is caused by solving the problems of the aqueous surfacer. That is, the surfacer of the present invention has a lifting phenomenon even in the case of using a solvent type finish coating material in repainting when an existing coating film that is dissolved by a solvent is present on the surface of the object to be coated. No lifting phenomenon occurs even in recoating when a solvent-type two-component reaction-curing type finish coating material is used. Furthermore, even when the existing coating film or the finishing coating material is a coating film having elasticity, the adhesion is sufficient and delamination does not occur. Therefore, the coating material, the existing coating film on the surface of the coating material, and the type of finishing coating material are not selected, so that a comprehensive coating film using a solvent-type finishing coating material with excellent non-staining effect and weather resistance, a multifunctional type It is possible to form a complete water-based comprehensive coating film using a water-based single-layer elastic finishing material or a super-weather-resistant water-based finishing material on an object to be coated or an existing coating on the surface of the object to be coated. Further, when forming the coating film, it is also possible to use a finishing method in which a concavo-convex pattern is left on the existing coating film, or a concavo-convex pattern is imparted to the surfacer itself, depending on the amount of the surfacer applied.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a lifting phenomenon of a crosslinked acrylic emulsion surfacer on a one-component solvent-type acrylic resin coating film by a solvent-type finish coating material.

FIG. 2 is a cross-sectional view showing a lifting phenomenon when a non-crosslinked type acrylic emulsion surfacer is recoated with a solvent type two-part reaction-curable urethane resin paint on a one-part solvent type acrylic resin coating film.

[Explanation of symbols]

a Base material b One-part solvent type acrylic resin coating film (existing coating film) c Cross-linking type acrylic emulsion surfacer d Solvent type finishing coating material coating e Lifting phenomenon f Resolved part by solvent g Non-cross-linking type Acrylic emulsion-based surfacer h Solvent-type two-component reaction-curable urethane resin paint film

[Table 4]

[Table 5]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification symbol FI C09D 127/04 C09D 127/04 133/06 133/06 (58) Fields surveyed (Int.Cl. ⁷ , DB name) B05D 1 / 00-7/26 C09D 127/04 C09D 133/06

Claims (8)

(57) [Claims] 1. A monomer containing (A) an alkyl acrylate and / or an alkyl methacrylate and having another functional group capable of causing a cross-linking reaction (hereinafter referred to as a monomer). , A functional group monomer), and an aqueous synthetic resin emulsion having a glass transition temperature (hereinafter, referred to as Tg) of -20 ° C to 10 ° C, (B) vinyl chloride, chloride A vinylidene chloride-based aqueous latex containing vinylidene, alkyl acrylate and / or alkyl methacrylate, containing no other functional group monomer, and having a weight average molecular weight of 30,000 to 200,000; (C) an inorganic powder;
The solid content of (B) is 5 to 40 parts by weight based on 100 parts by weight of the solid content of (A), and the chlorine content is 2.5 to 15.0% by weight based on the total resin solid weight. (A) and (B) are mixed to obtain a pigment volume concentration (hereinafter, referred to as PVC).
That. ) Is 15 to 60%, and further (C)
A coating finish method, comprising applying a finish coating material after applying a surfacer in which is mixed. 2. A method according to claim 1, wherein the functional monomer of (A) or (B) contains not more than 5% by weight of either or both of a hydroxyl group-containing monomer and a carboxyl group-containing monomer. The method of finishing the coating according to 1. 3. The method according to claim 2, wherein the hydroxyl group-containing monomer is 2-hydroxyethyl methacrylate. 4. The method according to claim 1, wherein the ratio of vinyl chloride to vinylidene chloride in (B) is from 100: 20 to 100: 180. 5. The ultra-weather resistant coating according to claim 1, wherein the finish coating material is a silicon-modified acrylic water-based paint containing cycloalkyl acrylate and / or cycloalkyl methacrylate. Water-based paint finishing method. 6. The method for finishing a non-staining coating according to claim 1, wherein the finishing coating material is a non-staining coating containing an alkyl silicate. 7. The method according to claim 1, wherein the existing coating is an elastic coating having an elongation of 50 to 500%. 8. The renovation according to claim 1, wherein the existing coating film is made of a non-crosslinked type one-pack type synthetic resin, and the finishing material is a solvent type. Finishing method.