JPH03154675A - Finish painting method - Google Patents

Abstract

PURPOSE:To form a composite layer excellent in environmental maintenance and weatherability by providing a layer of a coating material containing pigment and/or aggregate to a base material and applying a top coating material based on an aqueous dispersion of a fluorine-containing copolymer thereon. CONSTITUTION:A layer composed of a coating material containing pigment such as titanium dioxide, iron oxide, zine oxide or chromate and/or aggregate such as heavy calcium carbonate, a silica powder, barium sulfate or a silicic acid fine powder is provided on a base material. A top coating material based on an aqueous dispersion of a fluorine-containing copolymer is applied on said layer to perform finish painting. As the fluorine-containing copolymer, one having a unit based on fluoroolefin and a unit based on a macromonomer having a hydrophilic region is pref. If necessary, a colorant, a film forming agent, a dispersent or a thickner can be mixed with the top coating material.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a finishing coating method.

[Prior Art] Conventionally, multilayer finishing coating materials have been the mainstay of architectural finishing materials and finishing coating materials, and have become representative of exterior wall finishing for boats, and their range of applications is expanding. This multi-layer finishing paint forms a pattern with a main layer containing pigment and/or aggregate, and a topcoat material protects the main layer, imparts weather resistance, gives luster and aesthetics, and the like. Conventionally, solvent-based acrylic resin paints and acrylic urethane resin paints have been mainly used as the top coat material.

[Problems to be solved by the invention] Topcoating materials used in conventional multi-layer finishing coating methods have a low degree of weather resistance, and repainting is required in response to recent demands in the building industry toward higher-class buildings and rising repainting costs. It is not sufficient to deal with issues such as longer cycles. Recently, an air-drying type fluororesin paint has been proposed as a top coat material to solve these problems. However, since this fluororesin paint is solvent-based, it does not meet the social trend for environmental conservation and improved safety.

The present invention aims to solve the problems of the above-mentioned prior art, and provides a multi-layer finishing coating method that is excellent in environmental protection, safety, and weather resistance.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and includes applying a topcoat material to a base material through a layer consisting of a coating material containing pigment and/or aggregate. The present invention provides a finishing coating method for applying a fluorine-containing copolymer, which is characterized in that the top coating material is a coating material containing an aqueous fluorine-containing copolymer dispersion as a main component.

The fluorine-containing copolymer in the present invention is preferably a fluorine-containing copolymer having as essential constituents a unit based on a fluoroolefin and a polymerized unit based on a macromonomer having a hydrophilic site. Such a suitable fluorine-containing copolymer has excellent mechanical and chemical stability of the aqueous dispersion, so the storage stability of the finishing material is excellent, and film-forming properties and
Because the coating film has excellent water resistance and pigment dispersibility, it is possible to mix a high amount of pigment and apply thick coatings.

In addition, since the pigment has excellent fractional properties, it is possible to obtain a dense coating film, which exhibits particularly excellent weather resistance and blocking properties against water and light. When the method of the present invention is applied to a cement-based base material, it becomes a remarkable effect in preventing carbonation, preventing deterioration, and preventing oozing out of alkaline components.

Moreover, such a suitable aqueous dispersion of a fluorine-containing copolymer is
Because it has excellent stability, pigment, and dispersibility, it can be used without the use of flammable organic solvents such as alcohol, so it has extremely excellent advantages in terms of environmental protection and safety. Furthermore, since such a suitable fluorine-containing copolymer has a hydrophilic moiety, it is more waterproof than when using an aqueous dispersion in which a conventionally known solvent-soluble fluorine-containing copolymer is dispersed in water. , a coating film with excellent moisture permeability can be obtained. Therefore, it is extremely useful as a finishing coating method for ceramic building materials built in locations exposed to wind and rain.

In the preferred fluorine-containing copolymer of the present invention, the fluoroolefin has about 2 to 4 carbon atoms, such as tetrafluoroethylene, chlorotrifluoroethylene, trifluoroethylene, vinylidene fluoride, hexafluoropropylene, and pentafluoropropylene. fluoroolefins are preferably employed. In particular, barhaloolefins are preferably employed because they provide extremely excellent weather resistance.

In the present invention, it is important to have a polymerized unit based on a macromonomer having a suitable fluorine-containing copolymer hydrophilic site. Since this unit is included as an essential component of the fluorine-containing copolymer, it not only improves the mechanical and chemical stability of the aqueous dispersion (film-forming properties, water resistance of coatings, pigment In particular, even with a fluorine-containing copolymer having a functional group such as a hydroxyl group, extremely excellent aqueous dispersion stability can be achieved.

The macromonomer having a hydrophilic site in the present invention,
The hydrophilic site refers to a site having a hydrophilic group, a site having a hydrophilic bond, and a site consisting of a combination thereof. This hydrophilic group may be ionic, nonionic, amphoteric, or a combination thereof, but in the case where the above hydrophilic site consists only of a site having an ionic hydrophilic group, This is not preferable since there is a problem with the chemical stability of the aqueous dispersion, and it is desirable to combine it with a moiety having a nonionic or amphoteric hydrophilic group, or a moiety having a hydrophilic bond. Moreover, a macromonomer refers to a low molecular weight polymer or oligomer having a radically polymerizable unsaturated group at one end. That is, it is a compound having a radically polymerizable unsaturated group at one end and at least two repeating units.

Although it varies depending on the type of repeating unit, those having 100 or less repeating units are usually preferably employed from the viewpoint of polymerizability, weather resistance, etc.

As a macromonomer having a hydrophilic site, for example, (1) CHz=CHO(CHz)+[0(CH2)
-),,OX (l is 1 to l01m is 1 to 4, n is 2
(2) CHz: CHCHzO(CH2) l [0(
CH2)-)nOX (1, m, n.

X is the same as that in formula (1)) (1 is 1-10, m is 2-20, n is an integer from o to 2o,
X is H or a lower alkyl group, and the oxyethylene units and oxypropylene units may be arranged in either block or random form) (1, m, n, and X are the same as in formula (3) and
Examples include polyethers having a radically polymerizable unsaturated group at one end, such as (oxyethylene units and oxypropylene units may be arranged in either a block or random arrangement). Among these, those having a vinyl ether type structure at one end are preferably employed because they have excellent copolymerizability with fluoroolefins. In particular, polyether chain portions consisting of oxyethylene units or oxyethylene units and oxypropylene units are preferred because they have excellent hydrophilicity. In addition, properties such as stability cannot be achieved unless the number of oxyethylene units is small (two units at a time).Also, if the number of oxyalkylene units is too large, the water resistance and weather resistance of the coating film will be poor. Such a macromonomer having a hydrophilic moiety can be produced by polymerizing formaldehyde or diol with a vinyl ether or allyl ether having a hydroxyl group, or by ring-opening polymerization of an alkylene oxide or a compound having a lactone ring. It is possible to do so.

In addition, as a macromonomer having a hydrophilic site, a macromonomer having a chain formed by radical polymerization of a hydrophilic ethylenically unsaturated monomer and having a radically polymerizable unsaturated group such as vinyl ether or allyl ether at the end may be used. good. Such macromonomers can be produced by the method described by Yamano et al. in Polym, Bull, 5.335 (1981). That is,
A polymer having a condensable functional group is produced by radically polymerizing an ethylenically unsaturated monomer having a hydrophilic group in the presence of an initiator having a condensable functional group and a chain transfer agent; Examples include a method in which a compound such as glycidyl vinyl ether or glycidyl allyl ether is reacted with a functional group to be combined to introduce a radically polymerizable unsaturated group at the end.

Ethylenically unsaturated monomers used in the production of this macromonomer include acrylamide, methacrylamide, N-methylol acrylamide, N-methylol methacrylamide, 2-methoxyethyl acrylate, 2-
Methoxyethyl methacrylate, diacetone acrylamide, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, acrylic ester of polyhydric alcohol and methacrylic ester of polyhydric alcohol, and vinylpyrrolidone and so on. In addition, copolymerizable monomers include acrylamide and its derivatives, methacrylamide and its derivatives, N
-Methyloacrylamide derivative, ethyl calpitol acrylate, methyl triglycol acrylate, 2-
Examples include hydroxyethyl acryloyl phosphate and butoxyethyl acrylate.

In addition, 4.4-azobis-4-cyanovaleric acid, 2.
Examples include 2-azobis-2-amidinopropane hydrochloride, potassium peroxide, ammonium peroxide, azobisisobutyronitrile, and benzyl peroxide.

A suitable fluorine-containing copolymer in the present invention can contain a polymerized unit containing a hydroxyl group in addition to the above two types of units. The stability of the aqueous dispersion in the present invention is not impaired even if the fluorine-containing copolymer has a hydroxyl group. In addition, when the fluorine-containing copolymer has hydroxyl groups, it has the advantage that when used as a base coating material, a coating film with extremely excellent water and solvent resistance can be obtained by using a curing agent. be. Further, the polymerized unit containing a hydroxyl group can be formed by copolymerizing a hydroxyl group-containing monomer or by subjecting a polymer to a polymer reaction to form a unit containing a hydroxyl group. Here, hydroxyalkyl vinyl ethers such as hydroxybutyl vinyl ether, hydroxyalkyl allyl ethers such as hydroxyethyl allyl ether, hydroxyalkyl esters and hydroxyalkyl vinyl esters of acrylic acid or methacrylic acid such as hydroxyethyl acrylate, hydroxyethyl methacrylate, Examples include alkylallyl nys-7-ter. In addition, as a method for forming a unit containing a hydroxyl group by polymerizing a polymer, a method is to copolymerize a vinyl ester that can be hydrolyzed after polymerization, and then hydrolyze it to form a hydroxyl group. Examples include.

In addition to the above units, the fluorine-containing copolymer suitable for the present invention may contain units based on monomers copolymerizable with these units.

Examples of such monomers include olefins such as ethylene and propylene, vinyl ethers such as ethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, and cyclohexyl vinyl ether, and butyl vinyl ester.

Vinyl esters such as octyl vinyl ester, vinyl compounds such as aromatic vinyl compounds such as styrene and vinyltoluene, allyl ethers such as ethyl allyl ether, and allyl compounds such as butyl allyl ester,
Examples include acryloyl compounds such as butyl acrylate, and methacryloyl compounds such as ethyl methacrylate. In particular, olefins, vinyl ethers, vinyl esters, allyl ethers, and allyl esters are preferably employed.

Here, the olefins preferably have about 2 to IO carbon atoms, such as vinyl ethers, vinyl esters,
As the allyl ethers and allyl esters, those having a linear, branched or alicyclic alkyl group having about 2 to 15 carbon atoms are preferably employed. In such a monomer, at least a portion of hydrogen bonded to carbon may be replaced with fluorine.

In the preferred fluorine-containing copolymer of the present invention, the proportion of polymerized units based on fluoroolefins is 20 to 80 mol%, and the proportion of polymerized units based on macromonomers having a hydrophilic site is 0.1 to 25 mol%. It is preferable. If the amount of polymerized units based on fluoroolefins is too small, weather resistance will not be sufficiently exhibited, and if it is too large, the water dispersibility will be extremely poor, which is undesirable. In particular, 30 to 70 mol % is preferable. If the polymerized unit based on a macromonomer having a hydrophilic moiety is too small, the water dispersibility will be extremely poor, and if it is too large, the weather resistance and water resistance of the coating film will be poor. In order to achieve a very good effect, this unit should be 0.
It is preferably contained in a proportion of 3 to 20 mol%. Moreover, when a polymerized unit containing a hydroxyl group is included, it is preferably 25 mol % or less. If the proportion of this unit is too large, water dispersibility will decrease, and when the coating film is cured, it will become hard and brittle, and water resistance may decrease due to the influence of residual hydroxyl groups. I don't like it because there is. In addition, if this unit includes a polymerized unit based on a macromonomer having a hydrophilic site and a hydroxyl group, the unit is a polymerized unit based on a macromonomer having a hydrophilic site and a hydroxyl group. Both polymerized units containing groups are included in the calculation. Units other than the polymerized units based on the above-mentioned fluoroolefins and the polymerized units based on macromonomers having a hydrophilic site are:
It is preferably 0 to 70 mol%. Too much of this unit results in poor weather resistance, which is not preferable.

The top coating material in the present invention has an aqueous dispersion of the above-mentioned fluorine-containing copolymer as a main component. Here, the aqueous dispersion of the fluoropolymer is free of emulsifiers and hydrophilic organic solvents that are normally used in aqueous fluoropolymer dispersions (both of which exhibit excellent mechanical and chemical stability). Of course, either or both of an emulsifier and a hydrophilic organic solvent may be added.However, emulsifiers reduce the water resistance of the coating film, and hydrophilic organic solvents have environmental protection and safety concerns. It is preferable that no emulsifier is added.When using an emulsifier, anionic,
Cationic, nonionic, amphoteric, nonionic-cationic, nonionic-anionic, and those having reactive groups can be used alone or in combination.

The aqueous dispersion in the present invention can be produced by emulsion polymerization of a fluoroolefin, a macromonomer having a hydrophilic moiety, and, if necessary, other monomers in an aqueous medium. The initiation of emulsion polymerization is carried out by adding a polymerization initiator in the same manner as the initiation of ordinary emulsion polymerization. As such a polymerization initiator, an ordinary radical initiator can be used, but a water-soluble initiator is preferably employed, and specifically, a persulfate such as ammonium persulfate, hydrogen peroxide, or a combination of these and sodium bisulfite is used. , a redox initiator consisting of a combination with a reducing agent such as sodium thiosulfate,
In addition, inorganic initiators made by coexisting small amounts of iron, ferrous salts, silver sulfate, etc., or dibasic acid peroxides such as disuccinic acid peroxide and diglutaric acid peroxide,
Organic initiators such as azobisisobutyramidine hydrochloride and azobisbutyronitrile are exemplified. The amount of the polymerization initiator used can be changed as appropriate depending on the type, emulsion polymerization conditions, etc., but it is usually preferably about 0.005 to 0.5 parts by weight per 100 parts by weight of the monomer to be emulsion polymerized. Adopted. Further, these polymerization initiators may be added all at once, or may be added in portions as necessary.

In addition, for the purpose of increasing the pH of the emulsion, p! (Adjusting agents may be used. Such pH adjusting agents include inorganic bases such as sodium carbonate, potassium carbonate, sodium 0-hydrogen phosphate, sodium thiosulfate, and sodium tetraborate, and organic bases such as triethylamine and triethanolamine. The amount of the pH adjuster added is usually about 0.05 to 5 parts by weight, preferably about 0.1 to 1 part by weight, per 100 parts by weight of the emulsion polymerization medium.

In addition, the emulsion polymerization initiation temperature is appropriately selected depending on the type of polymerization initiator, but is usually 0 to 100°C,
In particular, a temperature of about 10 to 90°C is preferably employed. In addition, the reaction pressure can be selected as appropriate, but is usually 1 to 100
kg/ca+", particularly about 2 to 50 kg/cm" is desirable.

In such a production method, additives such as monomers, solvents, and initiators may be added all at once and polymerized. For the purpose of improving various physical properties, the polymerization may be pre-emulsified using a stirrer such as a homogenizer before adding the polymerization initiator, and then the initiator may be lowered and polymerized.Also, the monomer may be divided or They may be added continuously (in that case, the monomer composition may be different).

The top coating material in the present invention may contain extender pigments and/or pigments. Such extender pigments are not particularly limited. For example, heavy calcium carbonate, silica powder,
Calcium carbonate, barium sulfate, silicic acid fine powder, crushed stone, natural stone, pottery stone, kansui stone, raw stone mae, mica, plastic chips, etc. are used. The pigment may be a pigment commonly used in paints, and is not particularly limited. Examples include titanium dioxide (rutile or anatase), iron oxide, zinc oxide, and various colored pigments such as chromates and organic pigments that impart the desired color to the composition.

Furthermore, the top coating material in the present invention may optionally contain a colorant,
Film-forming agents, dispersants, thickeners, preservatives, anti-fungal agents, plasticizers, ultraviolet absorbers, leveling agents, anti-cissing agents, anti-scald agents, hardening agents, antifoaming agents, etc. may be mixed. Examples of the coloring agent include dyes, organic pigments, and inorganic pigments. As the film-forming auxiliary agent, a film-forming auxiliary agent commonly used in emulsion paints is used. For example, liquid organic compounds can be used, but preferred ones are glycol compounds such as ethylene glycol, propylene glycol, and their ether derivatives, ester derivatives, dibutyl phthalate, and dioctyl phthalate. 2,2,4-trimethyl-1,3-pentane glycol monobutyrate, which is used as a plasticizer, is used. In addition to these, general organic solvents can also be used.

Examples of the plasticizer include conventionally known ones, such as high molecular weight plasticizers such as the above-mentioned low molecular weight plasticizers, vinyl polymer plasticizers, and polyester plasticizers. Examples of the curing agent include blocked isocyanates such as hexamethylene isocyanate trimer, melamine resins such as methylated melamine, methylolated melamine, and butyrolated melamine, and urea resins such as methylated urea and butylated urea. .

Further, when the finishing material of the present invention is blended with another aqueous dispersion such as acrylic, the physical properties of the coating film may be improved and it may be advantageous in terms of cost.

In the present invention, coating materials containing pigments and/or aggregates that are commonly used as main materials for multilayer finishing coating materials can be suitably used. Specifically, J.
A main material as shown in IS A6910-1988 is exemplified. In addition, as such a layer, JIS A6915
-1984. It may be formed using a coating material as shown in JIS A6021-1989.

Aggregates that can be used in the present invention include aggregates used as the main material of finishing coating materials (there are no particular limitations, for example, heavy calcium carbonate, silica powder, calcium carbonate, barium sulfate, silicate fine powder, crushed stone). , natural stone, pottery stone, kansui stone, raw stone mae, mica, plastic chips, etc. are used.

By selecting and combining these aggregates and configuring the fluorine-containing copolymer as a binding material, the grooved type can be used as a finishing coating material (so-called lysine-like finishing coating material), and the thick type can be used as a finishing coating material (so-called stucco). In addition to synthetic resin emulsion-based multi-layer finish coating materials, there are also uneven, convex-treated, and crater-like finish coating materials, and finishing coating materials for roller coating, as well as astronomical pattern finish coating materials. The finishing coating material that forms the
A thick finish can be obtained.

Pigments that can be used in the present invention may be pigments that are commonly used in paints, and are not particularly limited. Examples include titanium dioxide (rutile or anatase), iron oxide, zinc oxide, and various colored pigments such as chromates and organic pigments that impart the desired color to the composition.

[Example] Synthesis example: Production volume of fluorine-containing copolymer aqueous dispersion 25
354 parts of ethyl vinyl ether 24 parts of hydroxybutyl vinyl ether A macromonomer having a hydrophilic moiety CH,=CH0(CH2)4(OCH
2CH2) 55 parts of nOH (number average molecular weight 500), 980 parts of ion-exchanged water, 10.4 parts of perfluorophthanic acid ammonium salt, 13 parts of the emulsifier Newcol 293 manufactured by Nippon Nyukazai Co., Ltd.
40 to 18 parts Potassium carbonate 2.1 parts Disodium hydrogen phosphate to 1014 parts of hydrate, Ammonium persulfate 0.7
After cooling with water, add 3.5 kg of nitrogen gas/
After repeating this process twice and degassing to 120 mmHg to remove dissolved air, 243 parts of chlorotrifluroethylene was added, and 30
Start the reaction at °C. At this time, the pressure in the autoclave was 3 kg/cm2G in gauge pressure, and as the reaction progressed, the pressure decreased, but an additional 365 parts of chlorotrifluoroethylene was added to keep the pressure constant (3 kg/cm2G).After that, The reaction was carried out until the gauge pressure reached approximately 0 kg/cm"G. Total reaction time was 26 hours.

The resulting aqueous dispersion was adjusted to have a fluorine-containing copolymer concentration of about 40% by weight, and used in the following examples.

Example 1 A water-based fluororesin paint having the following composition was prepared.

Fluorine-containing copolymer aqueous dispersion 89.0 parts Rutile titanium dioxide pigment 5.3 parts Additives 2.4 parts (dispersant, antifoaming agent, film forming aid, thickener) 100.0 parts (
(parts by weight) Using the obtained paint, make a multi-layer finish coating material and uniformly spray-paint a board using an asbestos slate board as a base material at 20°C and 65°C.
After being left to cure for 14 days under standard conditions of %R-H, a 2000-hour accelerated weathering test was conducted using a sunshine weather meter, and changes in appearance were observed with the naked eye and gloss retention was measured. The test results are also listed in Table-1.

The main material of the multi-layer finishing coating material used in this test is JIS
It is the main material of the multi-layer coating material RE of A6910-1988.

Comparative Example 1 In Example 1, an accelerated weathering test specimen was prepared in the same manner as in Example 1 using a commercially available solution-type acrylic resin paint and a commercially available solution-type acrylic urethane resin paint as the top coating materials, and the test specimens were tested using a sunshine weather meter. Accelerated weathering was performed for 2000 hours, and changes in appearance were observed with the naked eye and gloss retention was measured.

The test results are also listed in Table-1.

Table 1 Example 2 Fluorine-containing copolymer aqueous dispersion 93.1 parts Rutile titanium dioxide pigment 2.0 parts Additives
2.2 parts (dispersant, antifoaming agent, film forming aid, thickener) water
2.7 Part 1
00,0 parts (parts by weight) The same procedure as in Example 1 was carried out except for the above composition.

The obtained paint was used to create a multi-layer finish coating material, and a board was evenly spray-painted using an asbestos slate board as a base material, and then heated at 20°C and 65°C.
%R-)1 under standard conditions for 14 days to cure, a 2000 hour accelerated weathering test was conducted using a sunshine weather meter, and changes in appearance were observed with the naked eye and gloss retention was measured. The test results are also listed in Table-2.

The main material of the multi-layer finishing coating material used in this test is JIS
It is the main material of multilayer coating material E of A6910-1988.

Comparative Example 2 In Example 2, an accelerated weathering test specimen was prepared in the same manner as in Example 2 using a commercially available solution-type acrylic resin paint and a commercially available solution-type acrylic urethane resin paint as the top coating materials, and the test specimens were tested using a sunshine weather meter. Accelerated weathering was performed for 2000 hours, and changes in appearance were observed with the naked eye and gloss retention was measured.

The test results are also listed in Table-2.

Table 2 Example 3 A paint having the same composition as the paint prepared in Example 1 was used as the water-based fluororesin paint.

Fluorine-containing copolymer aqueous dispersion 89.0 parts Rutile titanium dioxide pigment 5.3 parts Additives
2.4 parts (dispersant, antifoaming agent, film forming aid, thickener) water
3.3 Part 1
00, 0 parts (parts by weight) Using the obtained paint, point upward to the south and make an angle of 30° with the horizontal plane. Various types of paint exposed outdoors for 3 years so that the lower end of the test piece is at least 700 mm above the ground. Adhesion tests with composite finishing coating materials and accelerated weathering tests were conducted. The various composite finish coating materials used in this test that were exposed outdoors for three years included the main material of JISA 6910-1988 multi-layer coating material GE, and the top coating materials included the respective main materials. Painted with solution type acrylic resin paint, solution type acrylic urethane resin paint, or water-based acrylic resin paint. In addition, before applying water-based fluororesin paint, wash with water and use water-resistant sandpaper #180 to prepare the surface to be painted.
The site was vandalized. A water-based fluororesin paint was spray-painted uniformly on the substrate after these preparations.
After being left to cure for 14 days under the standard conditions of ℃ and 65% R-H, we conducted an adhesion test using a tape goblin test and an accelerated weathering test for 2000 hours using a sunshine weather meter, and observed changes in appearance with the naked eye. and measured the gloss and luster retention rate. The test results are also listed in Table-3.

Comparative Example 3 In Example 3, a commercially available solution-type acrylic resin paint and a commercially available solution-type acrylic urethane resin paint were used instead of the water-based fluororesin paint, and the adhesion test by the tape goblin test and sunshine test were conducted in the same manner as in Example 3. A 2000 hour accelerated weathering test was conducted using a weather meter, and changes in appearance were observed with the naked eye and gloss retention was measured. The test results are also listed in Table-3.

As is clear from the above results, the multi-layer finishing coating material composed of water-based fluororesin paint as the top coating material is different from the conventional multi-layer finishing coating material using solution-type acrylic resin paint or solution-type acrylic urethane resin paint as the top coating material. It was confirmed that it has superior weather resistance compared to other materials.

[Effects of the invention] The method of the present invention can be used in places where solvent restrictions are imposed, or on-site.
A highly durable paint finish is possible even in urban areas. In particular, when a fluorine-containing copolymer having a unit based on a fluoroolefin and a unit based on a macromonomer having a hydrophilic site is used as the fluorine-containing copolymer.

Since it can be applied thickly and a dense coating film can be obtained, it exhibits particularly excellent weather resistance and water and light blocking properties, so it has extremely high utility value in the field of ceramic building materials.

Claims (1)

[Claims] 1. A finishing coating method in which a top coat is applied to a base material through a layer of a coating material containing pigment and/or aggregate, the top coat being a fluorine-containing copolymer. A finishing coating method characterized by using a paint whose main component is an aqueous dispersion. 2. The finishing coating method according to claim 1, wherein the fluorine-containing copolymer is a fluorine-containing copolymer having a unit based on a fluoroolefin and a unit based on a macromonomer having a hydrophilic site.