JPH0239948B2 - FUTSUSOKEITORYONOTOSOHOHO - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for applying a room-temperature curing fluorine-based liquid paint. [Prior Art] Paints with excellent weather resistance and durability are required for the exterior of buildings, vehicles, ships, aircraft, etc., and high-quality polyester or acrylic exterior paints are used. However, existing paints have a short outdoor service life, and even the above-mentioned high-quality paints lose their aesthetic appearance and substrate protection effect within a few years. On the other hand, fluorine-based paints are extremely stable both thermally and chemically, and have excellent weather resistance, water resistance, chemical resistance, solvent resistance, mold release properties, multi-friction properties, and water repellency. Suitable as a surface treatment agent for various substrates. However, conventionally known fluorine-based polymers suffer from the above-mentioned properties and are difficult to dissolve in organic solvents, making it difficult to form a coating film, making them extremely difficult to use as paints. For example, most of the currently known fluoropolymer paints are powder paints, and only a few
PVdF (polyvinylidene fluoride) is simply used as an organic solvent-dispersed paint by taking advantage of its ability to dissolve in specific solvents at high temperatures. Moreover, these fluoropolymer paints require baking at a high temperature when forming a film, so their field of use is limited to cases where heating equipment is available. Furthermore, the presence of heating equipment and the baking process are not desirable from the viewpoint of the safety of workers and the environment of the workplace. Therefore, in recent years, attempts have been made to develop fluorine-based polymers that are soluble in solvents or do not require a baking process at high temperatures. For example, the patent application filed by the present applicant in Japanese Patent Application No. 59-263017 discloses a ternary copolymer consisting of a fluoroolefin, a vinyl ether, an organosilicon compound having an olefinic unsaturated bond, and a hydrolyzable group. This copolymer is soluble in organic solvents and can be cured at room temperature. However, when this fluoropolymer is dissolved in an organic solvent and used as a paint, the coating formed on the base material has excellent weather resistance, chemical resistance, and low friction, but on the contrary, these There is a problem in that various properties are poor and the adhesion to substrates, particularly to inorganic substrates such as metals, is poor. By the way, in order to improve the adhesion to the base material, there are two methods: modifying the fluorine-based paint itself and interposing a primer layer between the fluorine-based paint and the base material. The present invention provides for the latter method. [Problems to be Solved by the Invention] In other words, the problems to be solved by the present invention are to improve the adhesion between a solution-type fluorine-based paint that can be cured at room temperature and a base material, and to form a strong bond on the base material. The objective is to form a fluorine-based polymer film. [Means for Solving the Problems] That is, the present invention uses a fluorinated paint as a base material in which a solvent-soluble fluorinated polymer that can be cured at room temperature and has fluoroolefin and vinyl ether as essential components is dissolved in an organic solubilizer. When coating the substrate, a metal alkoxide solution or an epoxy resin containing at least 3 parts by weight of a silane coupling agent having an epoxy or amino group as an organic functional group per 100 parts by weight of the resin is applied to the surface of the substrate in advance. A method for applying a fluorine-based paint is characterized in that the primer layer is dried or cured to form a primer layer, and then the fluorine-based paint is applied. [Function] The fluorine-based polymer, which is the main component of the fluorine-based paint of the present invention, can be cured at room temperature and has the property of being soluble in organic solvents. Fluorinated polymers with such properties contain fluoroolefin and vinyl ether as essential monomer components, and can be cured by a crosslinking reaction at room temperature in the presence or absence of a curing agent or curing accelerator catalyst. It also contains monomer components with organic functional groups. More specific examples of such fluorine-based polymers include the following polymers. That is, a copolymer consisting essentially of (a) a fluoroolefin, (b) a vinyl ether, and (c) an organosilicon compound having an olefinic unsaturated bond and a hydrolyzable group; (a) in the middle
(a): 30 to 70 mol% relative to the total number of moles of (c),
(b): 20 to 60 mol%, (c): 1 to 25 mol%,
Number average molecular weight (n) measured by gel permeation chromatography is 3000 to 200000
It is a fluorine-based polymer. Here, this fluoropolymer is a random copolymer consisting of at least the three types of monomer component units described above (a), (b) and (c). However, a small amount of other copolymerizable monomer components such as α-olefins, cycloolefins, unsaturated carboxylic acids, etc. may be copolymerized as long as the object of the present invention is not impaired. Fluoroolefin (a), which is a monomer component constituting the fluorine-based polymer, contains at least one
Perhalo-olefins having at least 3 fluorine atoms, preferably all hydrogen atoms of the olefin, are substituted with fluorine atoms and other halogen atoms. Furthermore, from the viewpoint of polymerizability and properties of the produced polymer, fluoroolefins having 2 or 3 carbon atoms are preferred. Examples of such fluoroolefins include _CF2 = _CF2 , CHF= _CF2 , _CH2 =CF2, _CH2 = _CHF , CClF=CF2, CHCl= _CF2 , _CCl2 = _{CF2 ,} CClF=CClF, CHF= _CCl2 , _CH2 =CClF, _CCl2 =fluoroethylene such as CClF, _CF3CF = _CF2 , _CF3CF =CHF, _CF3CH =
CF ₂ , CF ₃ CF=CH ₂ , CH ₃ CF=CHF, CHF ₂ CF
=CHF, _CF3CH = _CH2 , _CH3CF = _CF2 ,
CH ₃ CH=CF ₂ , CF ₃ CF=CH ₂ , CF ₂ ClCF=CF ₂ , CF ₃ CCl=CF ₂ ,
CF ₃ CF=CFCl, CF ₂ ClCCl=CF ₂ , CF ₂ ClCF=CFCl, CFCl ₂ CF=CF ₂ , CF ₃ CCl=CClF, CF ₃ CCl=CCl ₂ , CClF ₂ CF=CCl ₂ , CCl ₃ CF= CF ₂ , CF ₂ ClCCl=CCl ₂ , CFCl ₂ CCl=CCl ₂ , CF ₃ CF=
CHCl, CClF ₂ CF=CHCl, CH ₃ CCl=CHCl, CHF ₂ CCl=CCl ₂ , CF ₂ ClCH=CCl ₂ , CF ₂ ClCCl=CHCl, CCl ₃ CF=CHCl, CF ₂ ICF=CF ₂ , CF ₂ BrCH = CF ₂ , CF ₃ CBr = CHBr, CF ₂ ClCBr = CH ₂ , CH ₂ BrCF = CCl ₂ , CF ₃ CBr = CH ₂ , CF ₂ CH = CHBr, CF ₂ BrCH = CHF, CF ₂ BrCF = CF ₂ , etc. Fluoropropene series, CF ₃ CF ₂ CF=CF ₂ , CF ₃ CF=
CFCF ₃ , CF ₃ CH=CFCF ₃ , CF ₂ = CFCF ₂ CHF ₂ , CF ₃ CF ₂ CF=CH ₂ , CF ₃ CH=CHCF ₃ , CF ₂ = CFCF ₂ CH ₃ , CF ₂ = CFCH ₂ CH ₃ , CF ₃ CH ₂ CH=CH ₂ , CF ₃ CH=CHCH ₃ , CF ₂ = CHCH ₂ CH ₃ , CH ₃ CF 2 CH=CH ₂ , CFH ₂ CH=CHCFH ₂ , CH ₃ CF ₂ CH= _{CF 2 ,} CH Examples include fluoroolefin systems having 4 or more carbon atoms, such as ₂ = CFCH ₂ CH ₃ , CF ₃ (CF ₂ ) ₂ CF = CF ₂ , CF ₃ (CF ₂ ) ₃ CF = CF ₂ . Among these, as mentioned above, fluoroethylene and fluoropropene are preferred, particularly tetrafluoroethylene (CF ₂ = CF ₂ ), chlorotrifluoroethylene (CFCl = CF ₂ ) and hexafluoropropene (CF ₂ = CFCF _{3 )} . ) are preferred, and from the standpoint of safety and ease of handling, hexafluoropropene and chlorotolylfluoroethylene are more preferred. Further, in the present invention, it goes without saying that the fluoroolefin may be used alone or in combination. Vinyl ether (b) is a vinyl group, an alkyl (including cycloalkyl) group, an aryl group,
It is a compound in which an aralkyl group or the like is bonded to an ether, and among them, an alkyl vinyl ether, in particular, the number of carbon atoms is 8 or less, preferably 2 to 2.
An alkyl vinyl ether bonded to the alkyl group of No. 4 is preferred. Furthermore, alkyl vinyl ethers in which the alkyl group is in the form of a chain are most preferred. Examples of such vinyl ethers include ethyl vinyl ether, propyl vinyl ether, isopropyl vinyl ether, butyl vinyl ether,
tert-butyl vinyl ether, pentyl vinyl ether, hexyl vinyl ether, isohexyl vinyl ether, octyl vinyl ether, 4-
Chain alkyl vinyl ethers such as methyl-1-pentyl vinyl ether, cycloalkyl vinyl ethers such as cyclopentyl vinyl ether and cyclohexyl vinyl ether, aryl vinyl ethers such as phenyl vinyl ether, o-, m-, and p-tolyl vinyl ether, benzyl vinyl ether, Aralkyl vinyl ethers such as enethyl vinyl ether can be mentioned. Among these, linear alkyl vinyl ethers and cycloalkyl vinyl ethers are particularly preferred, and ethyl vinyl ether, propyl vinyl ether, and butyl vinyl ether are particularly preferred. Further, in the present invention, it goes without saying that the vinyl ether may be used alone or in a mixture of two or more vinyl ethers. The organosilicon compound (c) may be one having an olefinic unsaturated bond and a hydrolyzable group in the molecule, and specifically, those shown in the following general formulas (1) to (3) are exemplified. can do. R ¹ R ² SiY ¹ Y ² (1) R ¹ XSiY ¹ Y ² (2) R ¹ SiY ¹ Y ² Y ³ (3) (wherein, R ¹ and R ² have an olefinic unsaturated bond, They are ^the same or different groups consisting of carbon, ^hydrogen and optionally ^oxygen . ) More specific examples of R ¹ and R ² include vinyl,
Examples include allyl, butenyl, cyclohexenyl, and cyclopentadienyl, and terminal olefinic unsaturated bond groups are particularly preferred. Other preferred examples include _CH2 =CH-O-( _CH2 ) _3- , _CH2 =C( _CH3 )COO( _CH2 ) _3- , _CH2 =C( _CH3 )COO( _CH2 ) ₂ -O-( _CH2 ) _3- , Examples include groups such as. Among these, vinyl groups are most suitable. Specific examples of X include monovalent hydrocarbon groups such as methyl, ethyl, propyl, tetradecyl, octadecyl,
Groups include phenyl, benzyl, tolyl, etc., and these groups may also be halogen-substituted hydrocarbon groups. Specific examples of Y ¹ , Y ² and Y ³ include alkoxy groups such as methoxy, ethoxy, butoxy and methoxyethoxy, alkoxyalkoxy groups, acyloxy groups such as formyloxy, acetoxy and propionoxy, oximes such as -ON
=C( _CH3 ) ₂ , _-ON = _CHCH2C2H5 and -ON ₌
C( _{C6H5 ) 2} , or substituted amino and arylamino groups such as _-NHCH3 , _{-NHC2H5 and -NH} ( _C6H5 ), and any other hydrolyzable organic group. be. The organosilicon compound preferably used in the present invention is a compound represented by the general formula (3), and an organosilicon compound in which the groups Y ¹ , Y ² , and Y ³ are the same is particularly suitable. Among these, it is preferable that R ¹ is a vinyloxyalkyl group (CH ₂ =CH-O-(CH ₂ )n-) or a vinyl group, and Y ¹ to ^{Y 3} are an alkoxy group or an alkoxyalkoxy group. Examples include roxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, and vinyltris(methoxyethoxy)silane. However, vinylmethyldiethoxysilane, vinylphenyldimethoxysilane, etc. can be used as well. The content ratio of monomer components (a) to (c) in the fluorine-based polymer is based on the total number of moles of (a) to (c).
(a): 30-70 mol%, (b): 20-60 mol%, (c): 1-
25 mol%, ((a) + (b) + (c) = 100), mostly
(a): 40-60 mol%, (b): 20-50 mol%, (c): 5-
It is in the range of 20 mol%. The molecular weight is determined by gel permeation chromatography (GPC) using tetrahydrofuran as a solvent and monodisperse polystyrene of known molecular weight as a standard substance, and the number average molecular weight (n) is usually 3000 to 200000, often 5000
~100000 range. By adopting such a composition ratio and molecular weight, it becomes solvent soluble and has excellent film coating properties, and after being cured by the method described below, it has excellent solvent resistance, chemical resistance, weather resistance, heat resistance, and mechanical resistance. It has excellent physical properties. Another property of fluorine-based polymers is that they are amorphous or have low crystallinity, and many are amorphous. In general, the degree of crystallinity measured by X-rays is 0%, and in many cases no melting point is observed using a differential scanning calorimeter (DSC). Therefore, transparency is good. The glass transition temperature (Tg) is usually -60 to +20°C, often -40 to +5 when measured by DSC at a heating rate of 10°C/min after cooling the sample to -120°C.
in the range of ℃. An optical property is the refractive index ( _nD ), which is usually
1.48-1.34, mostly in the 1.44-1.36 range. The above-mentioned fluorine-based polymer can be produced by copolymerizing each of the monomers (a) to (c) detailed above in the presence of a well-known radical initiator. Here, each component (a) to (c) is important. For example, copolymerization does not occur with components (a) and (c) alone, but by adding component (b), ), (b), and (c) are copolymerized. Various known radical initiators can be used for copolymerization. Specifically, organic peroxides, organic peresters such as benzoyl peroxide, dichlorobenzoyl peroxide,
Dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di(peroxybenzoate) hexyne-3,1,4-bis(tert-butylperoxyisopropyl)benzene, lauroyl peroxide, tert-butyl Peracetate, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3,2,
5-dimethyl-2,5-di(tert-butylperoxy)hexane, tert-butyl perbenzoate, tert-butyl perphenylacetate, tert
-butyl perisobutyrate, tert-butyl per-sec-octoate, tert-butyl perpivalate, cumyl perpivalate, tert-butyl perdiethyl acetate, etc., and other azo compounds such as azobis-isobutylnitrile, dimethyl azoisobutyrate. and so on. Among these, dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3,2,5-dimethyl-2,5-di(tert- Dialkyl peroxides such as butylperoxy)hexane and 1,4-bis(tert-butylperoxyisopropyl)benzene are preferred. The copolymerization takes place in a reaction medium consisting of an organic solvent. The solvents used here include aromatic hydrocarbons such as benzene, toluene, and xylene, aliphatic hydrocarbons such as n-hexane, cyclohexane, and n-heptane, and chlorobenzene, bromobenzene, iodobenzene, and o-bromotoluene. Examples include halogenated aromatic hydrocarbons, halogenated aliphatic hydrocarbons such as tetrachloromethane, 1,1,1-trichloroethane, tetrachloroethylene, and 1-chlorobutane. Copolymerization is carried out by adding a radical initiator to the above solvent in a molar ratio of 10 ^-2 to 2 x 10 ^-3 based on the total number of moles of monomers. Also, the polymerization temperature is -30 to 200
℃, preferably 20~100℃, polymerization pressure 0~100℃
Kg/cm ² ·G, preferably 0 to 50 kg/cm ² ·G. The fluorine-based paint of the present invention is obtained by dissolving a fluorine-based polymer that is curable at room temperature and soluble in solvents in an organic solvent. Examples of organic solvents include aromatic hydrocarbons such as benzene, toluene, and xylene, ketones such as acetone and methyl ethyl ketone, ethers such as diethyl ether and dipropyl ether, alcohols such as ethanol, and trichloro. Examples include halogenated hydrocarbons such as methane, dichloroethane, and chlorobenzene. For example, when the above-mentioned polymer is used as a component of a fluorine-based paint, since it has a hydrolyzable organic group derived from the organosilicon compound (c), the molecular chain of the polymer breaks down when exposed to moisture. A cross-linking reaction occurs during this time, resulting in curing. Therefore, as a matter of course, moisture in the atmosphere can also cause crosslinking. Although it is clear that crosslinking progresses even when the fluoropolymer is used alone, it is preferable to add a silanol condensation catalyst so that the fluoropolymer film applied to the substrate is rapidly cured. In this case, a silanol condensation catalyst is added in advance to an organic solvent solution in which a fluoropolymer is dissolved. When this is applied to a substrate, the organic solvent evaporates and a curing reaction occurs at the same time as it comes into contact with moisture in the air, causing the film to harden. Therefore, it is a one-component fluorine-based paint. Known silanol catalysts can be used, but
For example, dibutyltin dilaurate, stannous acetate,
Carboxylic acid metal salts such as stannous octoate, lead naphthenate, iron 2-ethylhexanoate, cobalt naphthenate, organic bases such as ethylamine, hexylamine, dibutylamine, piperidine, etc.
Acids such as mineral acids and organic fatty acids. Suitable catalysts are alkyl tin salts of carboxylic acids,
Examples include dibutyltin dilaurate, dibutyltin dioctoate, and dibutyltin diacetate. The cross-linking reaction is carried out at room temperature, that is, around room temperature (0 to 40
The reaction proceeds satisfactorily at temperatures (°C), but the reaction may be carried out under heating if necessary. To use fluorocarbon paint, apply it to surfaces such as metal, wood, plastic, ceramic, paper, and glass using a brush, spray, or roller coater in the same way as regular liquid paints. The film after curing is weather resistant,
It has excellent chemical resistance, solvent resistance, water resistance, heat resistance, and low friction, as well as excellent transparency and gloss. In the present invention, when applying a fluorine-based paint onto a base material, the following is coated on the surface of the base material to be coated in advance to form a primer layer, and then the fluorine-based paint is applied on top of the primer layer. do. That is, one is a metal alkoxide solution, which is applied to the surface of the base material and air-dried to form a primer layer. The metal alkoxide may be any alkoxide of a transition metal, but alkoxides of Al, Ti, and Zr are preferred, and alkoxides of Ti are particularly preferred. Specifically, those represented by the general formula Al(OR) ₃ , Zr(OR) ₄ , Ti(OR) ₄ , where R is methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-
Examples include alkoxides consisting of at least one selected from butyl, tert-butyl, pentyl, isopentyl, hexyl, 2-ethylhexyl, and the like. The metal alkoxide solution is obtained by dissolving these metal alkoxides in an organic solvent, and preferably has a concentration of about 2% or less. To form a primer layer using a metal alkoxide solution, the solution is applied to the surface of a base material and dried by air drying or heating to form a primer layer. Another means of forming the primer layer is an epoxy resin formulated with a specific silane coupling agent. That is, it is an epoxy resin containing at least 3 parts by weight of a silane coupling agent having an epoxy group or an amino group as an organic functional group based on 100 parts by weight of the resin. Examples of the above-mentioned silane coupling agents include γ-glycidoxypropyltrimethoxysilane, β-(3,4epoxycyclohexyl)ethyltrimethoxysilane,
γ-aminopropyltriethoxysilane, N-
Examples include (β-aminoethyl)-γ-aminopropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane. Various known epoxy resins can be mentioned, but silane coupling agents are
It is blended in an amount of at least 3 parts by weight or more, preferably 8 parts by weight or more. If the amount is less than this, the adhesion to the fluoropolymer will be poor and it will not be able to function as a primer layer. To form a primer layer using an epoxy resin, a mixture of an epoxy resin and a known curing agent for epoxy resins is applied to the surface of the base material, and a crosslinking reaction is performed to cure the primer layer.
Form a primer layer. [Example] The content of the present invention will be explained below using preferred examples, but unless otherwise specified, the present invention is not limited to these examples, and any embodiments may be modified without impairing the purpose of the present invention. is also possible. [Reference Experiment] Fluorine-based polymers used in Examples were polymerized in the following manner. 80 g of benzene, 25.2 g of ethyl vinyl ether (EVE), 7.1 g of trimethoxy vinyl silane (TMVS), and 1 g of dilauroyl peroxide were placed in a stainless steel autoclave with an internal volume of 300 c.c., and solidified with acetone and dry ice, followed by deaeration. to remove oxygen from the system. Thereafter, 45 g of hexafluoropropene (HFP) was introduced into the autoclave and the temperature was raised. When the temperature inside the autoclave reached 65°C, the pressure was 8.1 Kg/cm ² . The reaction continued for 8 hours with stirring until the pressure reached 4.6
When the temperature reached Kg/cm ² , the autoclave was cooled with water to stop the reaction. After cooling, unreacted monomers were expelled, the autoclave was opened, and the reaction solution was taken out. After concentration, the mixture was washed with a benzene-methanol mixed solvent, concentrated again, and dried. The number average molecular weight of the obtained polymer by GPC was 0.7×10 ⁴ . In addition, compositional analysis was performed using elemental analysis and NMR, and HFP/BVE/TMVS = 48/40/12
(molar ratio). Example 1 A 1% tetrabutoxytitanium toluene solution (primer) was applied to a steel plate using a 50μ applicator and left at room temperature for 0 to 24 hours. A solution consisting of 100 parts by weight of the fluoropolymer of the experimental example, 66 parts by weight of toluene, and 0.3 parts by weight of dibutyltin dilaurate was applied onto this using a 100μ applicator.
The film thickness after drying was 22μ. After curing at room temperature for 10 days, checkered peel test, acetone
A 24-hour immersion test and a 24-hour toluene immersion test were conducted. The results are shown in Table 1. Note that the checkerboard peel test was conducted in the following manner. That is, cuts were made on the surface of the coating film applied to the steel plate according to "JIS K 5400-1979 Paint General Test Method 6.15 Grid Test". Next, apply cellophane adhesive tape with a width of 20 mm to the surface of the paint film in the grid area, rub it strongly with a spatula of 7 mm width to bring the tape into close contact with the surface of the paint film, and then rapidly move the cellophane tape vertically upward. I pulled it up and peeled it off. The cellophane tape was adhered and peeled off a total of four times from each direction of the four sides of the grid, and the number of grids that remained without being removed was determined, and the test results were indicated by that number.

[Table] Example 2 Di-n-butyltin dilaurate in Example 1 was mixed with n-butoxytitanium bisoctylene glycolate 70% butanol solution (Orgatics).
TC200 (manufactured by Matsumoto Pharmaceutical Co., Ltd.) (11 parts by weight), and a resin liquid was applied 2 hours after applying the primer. As a result, the cross-cut peel test was 100/100, and no abnormality was observed in either acetone immersion or toluene immersion. Example 3 The same procedure as in Example 1 was conducted except that a 1% toluene solution of tetrabutoxyzirconium was used instead of the 1% tetrabutoxytitanium solution in Example 1, and the steel plate was left to stand for 4 hours after the primer was applied.
As a result, the cross-cut peel test was 100/100, and there were no abnormalities in both acetone immersion and toluene immersion. Example 4 100 parts by weight of epoxy resin Epomiku R301,
A solution consisting of γ-glycidoxypropyltrimethoxysilane (Shin-Etsu Chemical KBM403) in the amount shown in Table 2 (parts by weight) and 100 parts by weight of methyl ethyl ketone was used as the main ingredient, and Epomic Q635 was added as a hardening agent to form a steel plate. It was applied and used as a primer. After 24 hours, apply 150μ of the resin solution shown in Example 1.
It was applied using an applicator. After curing at room temperature for 10 days, a test was conducted and the results shown in Table 2 were obtained.

【table】

〔Effect of the invention〕

According to the method of the present invention, optical properties such as transparency, weather resistance, chemical resistance, mechanical properties, low friction properties,
A fluorine-based film with excellent water repellency can be firmly adhered to various base materials, and the adhesion to the base material is not affected whether the fluorine-based film is thin or thick. . Therefore, coating agents for metals, wood, plastics, ceramics, paper, etc.
It can be used as a surface coating for optical fibers, optical disks, and liquid crystal display substrates.

Claims (1)

[Scope of Claims] 1. When coating a base material with a fluorine-based paint prepared by dissolving a solvent-soluble fluorine-based polymer which can be cured at room temperature and which contains fluoroolefin and vinyl ether as essential components in an organic solvent, a metal alkoxide solution, Or, an epoxy resin containing at least 3 parts by weight of a silane coupling agent having an epoxy group or an amino group as an organic functional group per 100 parts by weight of the resin is coated on the surface of the base material in advance and dried or cured to form a primer layer. 1. A method for applying a fluorine-based paint, the method comprising: forming a fluorine-based paint, and then applying the fluorine-based paint. 2 The fluorine-based polymer is (a) fluoroolefin, (b)
A copolymer consisting essentially of vinyl ether and (c) an organosilicon compound having an olefinic unsaturated bond and a hydrolyzable group, the total of (a) to (c) in the copolymer. (a): 30 to 70 mol%, (b): 20 to 60 mol%, and (c): 1 to 25 mol% based on the number of moles, measured by gel permeation chromatography. The number average molecular weight (n) is 3000~
200000. A method for applying a fluorine-based paint according to claim 1, which is a fluorine-based polymer defined by 200,000. 3. Claim 1, wherein the metal alkoxide is a metal alkoxide selected from Ti, Zr, and Al.
The method for applying a fluorine-based paint according to item 1 or 2. 4 Silane coupling agents blended into epoxy resins include γ-glycidoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(β-amino ethyl)-γ
-aminopropyltrimethoxysilane, N-(β
Claim 1 selected from -aminoethyl)-γ-aminopropylmethyldimethoxysilane
The method for applying a fluorine-based paint according to item 1 or 2.