JP2014028899A - Finishing agent for coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finishing agent for a coating film not spoiling a surface appearance when a composition for coating prepared without a selection of materials to be mixed is applied, and to provide a composition for coating and coating film using the same.SOLUTION: A finishing agent for a coating film contains a polymer having specific functional groups. A composition for coating containing the same and further a coating film prepared from the composition are provided.

Description

The present invention relates to a coating film finishing agent, a coating composition using the same, and a coating film obtained by coating the coating composition.

In the coatings field, there are coating compositions using various base polymers and solvents or dispersion media and other blends. However, the composition has various mixed states depending on the compatibility with components other than the relatively fluid base polymer, solvent, or dispersion medium. As a result, the appearance of the coating film appears in various states after the coating composition is applied and dried. Regardless of the choice of materials to be mixed, it is a very important issue in the design of paints, and a means for solving this problem has been demanded.

  Speaking of the conventional finishing agent in Patent Document 1, by providing stretchability to the coating, for the purpose of providing an excellent coating finish that does not cause cracks that occur after painting on the coated object, A plurality of components consisting of an acrylic resin, a defoaming agent, a fluid humidifying component, a moisture-proofing agent, water, a plasticizer, a mildew-proofing agent, a pigment dispersant, an inorganic material, and a dry coalescence component were prepared. The addition of things is known.

  Moreover, in the patent document 2, in the finishing method of the specific coating-film surface including the process of apply | coating a finishing agent to the coating-film surface, and the process of polishing the coating-film surface where the finishing agent was apply | coated, a finishing agent is water, Methods such as petroleum-based solvents and aqueous compositions containing a plurality of plastic particles are known.

JP-A-2-29467 JP, 2004-89907, A These mixture has specified the amount ratio, compatibility, etc. of a plurality of constituents, and is effective only for the finish of a coat in the range where material selection is very limited. Absent.

As a result of intensive studies, the inventor found that the surface appearance of the coating film using the coating material prepared by including a polymer containing a specific functional group as a finishing agent of the coating film in a general coating composition is superior. It was discovered that this was improved and the present invention was completed.

That is, the following formula (I):

A coating film finishing agent characterized by comprising a polymer containing a group represented by formula (1), a coating composition comprising the same, and a coating film prepared thereby.

By using the solving means of the present invention described in the above-mentioned solving means, the surface appearance of the coating film is significantly improved.

In one molecule, the following formula (I):

It is invention which uses the coating film finishing agent characterized by including the polymer containing the monomer unit represented by these as a basic component.

In the formula (I), R ¹ represents a methylene group (—CH ₂ —), an ethylene group (—CH ₂ CH ₂ —), a propylene group (—CH ₂ CH (CH ₃ ) —) or a butylene group (—CH ₂ CH _(CH 2 _CH 3) -) it is. Among these, an ethylene group is preferred for reasons such as availability. When it is an ethylene group, the repeating unit represented by (R ¹ —O) is ethylene oxide. R ¹ may be composed of a plurality of functional groups. For example, the above (R ¹ —O) _n may be a combination of ethylene oxide and propylene oxide.

n is the number of repeating units represented by (R ¹ —O). n is preferably 10 to 300, more preferably 10 to 100, still more preferably 20 to 80, particularly preferably 40 to 60, and most preferably 45 to 55. .

  X is a direct bond, —C (═O) —, or —C (═O) NH—.

R ² is a hydrocarbon group having 6 to 30 carbon atoms. Hydrocarbon groups include linear, branched or cyclic alkyl groups, aryl groups, alkylaryl groups, and the like. These hydrocarbon groups may be partially substituted as long as the association action by the monomer unit represented by the formula (I) is not inhibited. The straight chain alkyl group includes a hexyl group, a heptyl group, an octyl group, a nonyl group, a dodecyl group, an octadecyl group, and the like. The branched alkyl group includes a 3-methylhexyl group, a 4,4-diethyloctyl group, and the like. The cyclic alkyl group includes a cyclooctyl group, a cholestanyl group, a lanostannyl group, and the like. The aryl group includes a phenyl group, a naphthyl group, an anthryl group and the like. The alkylaryl group includes a nonylphenyl group, a dodecylphenyl group, a nonylphenyl group, and the like. In view of efficient association, R ² is preferably a hydrocarbon group having 8 to 30 carbon atoms, more preferably an alkyl group having 8 to 30 carbon atoms, and further preferably an alkyl group having 12 to 20 carbon atoms. Group, particularly preferably an alkyl group having 16 to 20 carbon atoms, and most preferably an alkyl group having 18 carbon atoms.

  A preferred specific embodiment of the monomer unit represented by the formula (I) is represented by the following formula (II):

It is. The monomer unit represented by the formula (II) has a functional group of the formula (I) in which R ¹ is an ethylene group in the side chain. In the formula (II), n, X, and R ² are as defined above, and thus description thereof is omitted.
More specifically, the present invention is a coating film finish comprising a polymer having a monomer unit represented by formula (I) and an acidic group monomer unit. The acidic group monomer unit is a monomer unit having an acidic functional group or a salt thereof. Examples of the acidic functional group include a carboxyl group (—COOH), a sulfonic acid group (—SO ₃ H), and a phosphoric acid group (—PO ₃ H ₂ ). Salts can be formed by neutralizing acidic functional groups with alkaline compounds and the like. Examples of the salt include sodium salt, potassium salt or ammonium salt of an acidic functional group. However, acidic functional groups and salts thereof are not limited to these. Of the acidic functional groups and salts thereof, carboxyl groups and salts thereof are preferred. This is because a monomer having a carboxyl group or a salt thereof is less hydrophilic than other acid group-containing monomers and has high stability during polymerization. Among the monomers having a carboxyl group or a salt thereof, acrylic acid and methacrylic acid having good copolymerizability with other monomers and salts thereof are preferable.

  The acidic group monomer unit consists only of a monomer unit having an acidic functional group, and there may be no monomer unit having a salt thereof, or only a monomer unit having a salt thereof, which has an acidic functional group. There may be no monomer unit to have. The acidic group monomer unit may include both a monomer unit having an acidic functional group and a monomer unit having a salt thereof.

  The acidic group monomer unit is formed by polymerization using a polymerizable monomer having these functional groups. The salt can be formed by neutralizing the acid contained in the acidic group monomer unit after forming the polymer. You may form a polymer using the monomer neutralized previously.

Monomers having a carboxyl group such as acrylic acid, methacrylic acid, acryloxypropionic acid, citraconic acid, itaconic acid, crotonic acid, maleic acid, maleic anhydride, etc .: vinyl sulfone Monomers having a sulfonic acid group such as acid, styrene sulfonic acid, sulfoethyl (meth) acrylate: mono (2-methacryloyloxyethyl) phosphate, mono (2-acryloyloxyethyl) phosphate, 2- (meth) acryloyloxypropyl phosphate, Monomers having a phosphoric acid group such as 2- (meth) acryloyloxy-3-chloropropyl phosphate and 2- (meth) acryloyloxyethyl phenyl phosphate are included. Also included are sodium, potassium or ammonium salts of these monomers. However, the monomer as a raw material of the acidic group monomer unit is not limited to these, and may be polymerizable and have an acidic functional group or a salt thereof. Moreover, the monomer as a raw material used may be 1 type, or 2 or more types.
The polymer used as the coating film finish may further have other monomer units. For example, a monomer unit represented by the formula (I), an acidic group monomer unit, and a monomer unit derived from a copolymerizable ethylenically unsaturated monomer (hereinafter referred to as “ethylene”). May also be referred to as a “unsaturated monomer unit”. When the polymer has an ethylenically unsaturated monomer unit, polymerization stability and water resistance are good.

  Examples of ethylenically unsaturated monomers include styrene-based polymerizable monomers such as styrene, vinyl toluene, α-methyl styrene, ethyl vinyl benzene, and chloromethyl styrene; (meth) acrylamide, N-monomethyl (meth) acrylamide, N-monoethyl ( (Meth) acrylamide, N, N-dimethyl (meth) acrylamide and other (meth) acrylamide polymerizable monomers; (meth) acrylic such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate (Meth) acrylic acid ester-based polymerizable monomer that is an ester of an acid and an alcohol having 1 to 8 carbon atoms; a cyclohexyl group-containing polymerizable monomer such as cyclohexyl (meth) acrylate; 2-hydroxyethyl (meth) acrylate; (Meth) acrylic acid 2-hydroxypropiate Hydroxyl group-containing (meth) acrylic acid ester-based polymerizable monomer such as polyethylene glycol (meth) acrylic ester and other (meth) acrylic acid and polyalkylene glycol monoesters of polyethylene glycol chain-containing polymerizable monomers; vinyl acetate N-vinyl pyrrolidone, dimethylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, vinyl pyridine, vinyl imidazole, and other basic polymerizable monomers; N -Crosslinkable (meth) acrylamide polymerizable monomers such as methylol (meth) acrylamide, N-butoxymethyl (meth) acrylamide; vinyltrimethoxysilane, vinyltriethoxysilane, γ- (meta Hydrolyzable silicon group-containing polymerizable monomer having a functional group directly bonded to a silicon atom such as acryloylpropyltrimethoxysilane, vinyltris (2-methoxyethoxy) silane, and allyltriethoxysilane; glycidyl (meth) acrylate, acrylglycidyl ether Epoxy group-containing polymerizable monomers such as 2-isopropenyl-2-oxazoline, 2-vinyloxazoline and other oxazoline group-containing polymerizable monomers; (meth) acrylic acid-2-aziridinylethyl, (meth) acryloylaziridine Aziridine group-containing polymerizable monomers such as vinyl fluoride, vinylidene fluoride, vinyl chloride, vinylidene chloride and the like. Two or more ethylenically unsaturated monomers may be used. Other monomers may be used as a raw material. Among these, a (meth) acrylic acid ester-based polymerizable monomer that is an ester of (meth) acrylic acid and an alcohol having 1 to 8 carbon atoms is more preferable.

  The polymer used as a coating film finishing agent may have a crosslinkable monomer unit. The crosslinkable monomer unit can be formed from a polyfunctional monomer having two or more polymerizable unsaturated groups in the molecule. Such polyfunctional monomers include (meth) acrylic acid, ethylene glycol, 1,3-butylene glycol, diethylene glycol, 1,6-hexanediol, neopentyl glycol, polyethylene glycol, propylene glycol, polypropylene glycol, trimethylol. (Meth) acrylic acid ester monomers such as esterified products with polyhydric alcohols such as propane, pentaerythritol and dipentaerythritol; (meth) acrylic acid amide monomers such as methylene (meth) acrylamide; diallyl phthalate, diallylmer Allyl polymerizable monomers such as rate and diallyl fumarate; allyl (meth) acrylate and divinylbenzene are included. Two or more of these may be used in combination. However, the crosslinkable monomer unit is not limited to these as long as it crosslinks between polymer chains.

  The coating film finish of the present invention preferably comprises a polymer having an acidic group monomer unit and a monomer unit represented by the formula (I). Therefore, the “film finish” includes not only a polymer alone but also a solution such as an emulsion containing the polymer in its concept. Moreover, the coating film finishing agent of the present invention is usually used in an aqueous system.

  Next, the constitution ratio of each monomer unit of the polymer used as the coating film finishing agent of the present invention will be described. The polymer used as the finishing agent essentially contains an acidic group monomer unit and a monomer unit represented by the formula (I). Moreover, the polymer may contain other monomer units, such as a monomer unit resulting from an ethylenically unsaturated monomer.

  The blending ratio of the monomer unit represented by the formula (I) is preferably 0.1% to 10% with respect to all the monomer units, and is 0.1% or more from the viewpoint of improving the coating film smoothness, and more Preferably it is 0.5%, more preferably 1%. From the viewpoint of improving water resistance, it is preferably 10% or less, more preferably 7% or less, and still more preferably 5% or less.

  The blending ratio of the acidic group monomer unit is preferably 10 to 60% with respect to all the monomer units, preferably 10% or more, more preferably 15% or more, and further preferably 20% or more from the viewpoint of improving the appearance of the coating film. It is. From the viewpoint of improving water resistance, it is preferably 60% or less, more preferably 50% or less, and still more preferably 40% or less. In addition, when using 2 or more types of acidic group monomer units, it is preferable that the total amount of each acidic group monomer unit satisfy | fills the said range.

  The blending ratio of the ethylenically unsaturated monomer is preferably in the range of 30 to 80% with respect to the total monomer units. From the viewpoint of improving the appearance of the coating film, it is preferably 80% or less, more preferably 70% or less, and still more preferably 60% or less. Further, from the viewpoint of improving water resistance, it is preferably 30% or more, more preferably 35% or more, and further preferably 40% or more.

  The weight average molecular weight of the polymer used as the finishing agent in the coating film finishing agent of the present invention is preferably 3,000 or more, more preferably 10,000 or more, and still more preferably 100,000 or more. However, when a crosslinkable monomer is used, the molecular weight becomes very high, and it is difficult to measure the molecular weight by GPC.

  A polymer as a finishing agent is obtained by polymerizing monomer components. The polymerization method of the monomer component is not particularly limited. Polymerization can be performed using emulsion polymerization, reverse phase suspension polymerization, suspension polymerization, solution polymerization, aqueous solution polymerization, bulk polymerization, and the like. Among these polymerization methods, emulsion polymerization is preferable. In emulsion polymerization, a high molecular weight copolymer can be polymerized at a high concentration, the handling viscosity is low, and the production cost is low. Even when the polymer is produced by emulsion polymerization, the procedure is not particularly limited. For example, an aqueous solution in which a predetermined amount of monomer is dissolved may be prepared, a pre-emulsion may be formed using an emulsifier, and then a polymerization initiator may be added to advance the polymerization reaction. The blending ratio of each monomer is determined according to the blending ratio of the monomer units in the polymer described above.

  For the acidic group monomer unit, the ethylenically unsaturated monomer, etc., commercially available drugs may be used, or raw materials may be prepared by themselves. The monomer unit represented by the formula (I) may be a commercially available drug, or may be synthesized according to a known method described in JP-A No. 2001-240630.

  Hereinafter, the emulsifier, the polymerization initiator, and the polymerization conditions used in the case of obtaining a polymer as a finishing agent by emulsion polymerization will be described.

  Emulsion polymerization can be performed in an aqueous medium. The aqueous medium is not particularly limited, and examples thereof include water, a mixed solvent of one or more kinds of solvents that can be mixed with water, a mixed solvent in which water is a main component in such a solvent, and the like. Can be mentioned. Of these, water is preferred.

  The emulsifier is not particularly limited, and various emulsifiers can be used. For example, anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, polymer surfactants, reactive surfactants thereof and the like can be used as emulsifiers. These may be used in combination.

  Examples of anionic surfactants include alkyl sulfate salts such as sodium dodecyl sulfate, potassium dodecyl sulfate, and ammonium alkyl sulfate; sodium dodecyl polyglycol ether sulfate; sodium sulforicinoate; alkyl sulfonate such as sulfonated paraffin salt; sodium dodecylbenzene Alkyl sulfonates such as sulfonates and alkali metal sulfates of alkali phenol hydroxyethylene; high alkyl naphthalene sulfonates; naphthalene sulfonic acid formalin condensates; fatty acid salts such as sodium laurate, triethanolamine oleate, triethanolamine abietate; poly Oxyalkyl ether sulfate ester salt; Polyoxyethylene carboxylate sulfate ester Le salts; polyoxyethylene phenyl ether sulfate; dialkyl succinate sulfonate; and the like polyoxyethylene alkyl aryl sulfate salts. However, the anionic surfactant is not limited to these. Two or more anionic surfactants may be used.

  Nonionic surfactants include polyoxyethylene alkyl ethers; polyoxyethylene alkyl aryl ethers; sorbitan aliphatic esters; polyoxyethylene sorbitan aliphatic esters; aliphatic monoglycerides such as monolaurate of glycerol; polyoxyethyleneoxypropylene Copolymer; Condensation products of ethylene oxide and aliphatic amines, amides or acids are included. However, the nonionic surfactant is not limited to these. Two or more nonionic surfactants may be used.

  Cationic surfactants include dialkyldimethylammonium salts, ester-type dialkylammonium salts, amide-type dialkylammonium salts, dialkylimidazolinium salts, and the like. However, the cationic surfactant is not limited to these. Two or more cationic surfactants may be used.

  Amphoteric surfactants include alkyldimethylaminoacetic acid betaines, alkyldimethylamine oxides, alkylcarboxymethylhydroxyethyl imidazolinium betaines, alkylamidopropyl betaines, alkylhydroxysulfobetaines, and the like. However, the amphoteric surfactant is not limited to these. Two or more amphoteric surfactants may be used.

  Polymeric surfactants include polyvinyl alcohol and modified products thereof; (meth) acrylic acid-based water-soluble polymers; hydroxyethyl (meth) acrylic acid-based water-soluble polymers; hydroxypropyl (meth) acrylic acid-based water-soluble polymers Molecule; polyvinylpyrrolidone and the like are included. However, the polymer surfactant is not limited to these. Two or more kinds of polymer surfactants may be used.

  Among the emulsifiers, it is preferable to use a reactive emulsifier. From the environmental viewpoint, it is preferable to use a non-nonylphenyl emulsifier.

  The polymerization initiator is not particularly limited as long as it is a substance that decomposes by heat and generates radical molecules. In emulsion polymerization, a water-soluble initiator is preferably used. Examples of the polymerization initiator include persulfates such as potassium persulfate, ammonium persulfate, and sodium persulfate; 2,2′-azobis (2-amidinopropane) dihydrochloride, 4,4′-azobis (4-cyanopentanoic acid) Water-soluble azo compounds such as hydrogen peroxide; thermal decomposition initiators such as hydrogen peroxide; hydrogen peroxide and ascorbic acid, t-butyl hydroperoxide and rongalite, potassium persulfate and metal salts, ammonium persulfate and sodium bisulfite, etc. Redox polymerization initiators and the like are included. However, the polymerization initiator is not limited to these. Two or more polymerization initiators may be used.

  The usage-amount of a polymerization initiator is not specifically limited, What is necessary is just to set suitably according to the kind etc. of polymerization initiator. For example, when the total amount of all monomers is 100 parts by mass, it is preferably 0.1 to 2 parts by mass, more preferably 0.2 to 1 part by mass.

  The emulsion polymerization for producing the coating film finishing agent is performed in the presence of a chelating agent such as sodium ethylenediaminetetraacetate, a dispersing agent such as sodium polyacrylate, an inorganic salt, or the like, if necessary. Examples of the method for adding a monomer, a polymerization initiator, and the like include a batch addition method, a continuous addition method, a multistage addition method, and the like. You may combine these addition methods suitably.

  The polymerization temperature in emulsion polymerization is not particularly limited. The polymerization temperature is preferably 0 to 100 ° C, more preferably 40 to 95 ° C. The polymerization time is not particularly limited. The polymerization time is preferably 3 to 15 hours. When emulsion polymerization is performed, a hydrophilic solvent, an additive, or the like may be added as long as the physical properties of the obtained polymer are not adversely affected. The method for adding the monomer component to the emulsion polymerization reaction system is not particularly limited, and a batch addition method, a monomer component dropping method, a pre-emulsion method, a power feed method, a seed method, a multistage addition method, or the like may be used. it can.

  The nonvolatile content in the emulsion obtained after the emulsion polymerization reaction, that is, the polymer as the finishing agent is preferably 60% by mass or less. If the non-volatile content exceeds 60% by mass, the viscosity of the emulsion is too high, so that the dispersion stability cannot be maintained and aggregation may occur. Although there is no limitation in particular about the average particle diameter of the said emulsion, Preferably it is 10 nm-1 micrometer, More preferably, it is 20-500 nm. If the average particle size of the emulsion is less than 10 nm, the viscosity of the emulsion becomes too high, and the dispersion stability may not be maintained and aggregation may occur. On the other hand, when it exceeds 1 μm, it is no longer an emulsion.

  In emulsion polymerization, a chain transfer agent may be used in an amount of 0.001 to 2 parts by mass per 100 parts by mass of the monomer component in order to reduce the molecular weight. Chain transfer agents include halogen-substituted alkanes such as carbon tetrachloride, bromoform, bromotrichloroethane; alkyl mercaptans such as n-dodecyl mercaptan, tert-dodecyl mercaptan, octyl mercaptan, tetradecyl mercaptan, hexadecyl mercaptan; butyl thioglycolate, Examples include thioesters such as alkyl monothioglycolate such as isooctyl thioglycolate and dodecyl thioglycolate; alcohols such as methanol, ethanol and isopropanol; α-methylstyrene dimer, terpinol, terpinene and dipentene. However, the chain transfer agent is not limited to these. Two or more chain transfer agents may be used.

  As shown in the examples, the coating film finish of the present invention is blended with other components to form a coating composition, for example, a building exterior coating. Other ingredients to be blended are: solvent; aqueous copolymer latex; plasticizer; film-forming aid; stabilizer; wetting agent; preservative; antifoaming agent; inorganic filler; colorant; An antifoaming agent, an anti-aging agent, an antifungal agent, an ultraviolet absorber, a flame retardant, and an antistatic agent. Preferably, the coating composition contains at least the aqueous coating film finish of the present invention, the aqueous copolymer latex, and the inorganic filler, and the coating film appearance is good.

A preferable range of the amount of the coating film finishing agent of the present invention is 0.01 to 5% as a coating film finishing agent solid content with respect to the total solid content of the coating composition. From the viewpoint of improving the smoothness of the coating film, it is preferably 0.01% or more, more preferably 0.1% or more, and further preferably 0.3% or more. From the viewpoint of improving water resistance, it is preferably 5% or less, more preferably 4% or less, and still more preferably 3% or less.

<Production Examples 1-3>
Synthesis of copolymer containing monomer unit represented by formula (I) [Production Example 1: Synthesis of polymer containing monomer unit represented by formula (I)]
In a four-necked separable flask equipped with a stirrer, thermometer, condenser, nitrogen inlet tube, and dropping funnel, ion-exchanged water (115 parts), polyoxyethylene dodecyl ether sulfonate ammonium salt (1.5 parts) Was introduced. While stirring at an internal temperature of 68 ° C., nitrogen was gently flowed to completely replace the inside of the reaction vessel with nitrogen. Next, ammonium sulfonate (1.5 parts) of polyoxyethylene dodecyl ether was dissolved in ion-exchanged water (92 parts).

Here, methacrylic acid (40 parts), octadecyl polyoxyethylene (3-methyl-3-butenyl) ether ester bond (ethylene oxide 50 mol adduct) (10 parts), and ethyl acrylate as a polymer monomer (50 parts) of the mixture was added and stirred to prepare a pre-emulsion. Incidentally, methacrylic acid is a raw material for alkali-soluble monomer units, octadecyl polyoxyethylene (3-methyl-3-butenyl) ether is a raw material for associative monomer units, and ethyl acrylate is a raw material for ethylenically unsaturated monomer units. It is. In addition, the structure of the ester bond (ethylene oxide 50 mol addition product) of octadecyl polyoxyethylene (3-methyl-3-butenyl) ether is shown below.

5% of the pre-emulsion containing the polymer monomer was put into a reaction vessel and stirred for 5 minutes, and then sodium bisulfite (0.017 part) was added. Separately, ammonium persulfate (0.23 parts) was mixed with ion-exchanged water (23 parts) to prepare a polymerization initiator aqueous solution. 5% of this polymerization initiator aqueous solution was put into the reaction vessel and stirred for 20 minutes to carry out initial polymerization. The internal temperature of the reaction vessel was maintained at 72 ° C., and the remaining pre-emulsion and initiator aqueous solution were uniformly added dropwise over 2 hours. After completion of dropping, the dropping tank was washed with ion-exchanged water (8 parts) and then charged into the reaction vessel. The internal temperature was kept at 72 ° C., and stirring was continued for another hour, followed by cooling to complete the reaction. A coating film finishing agent 1 having a nonvolatile content of 30% was obtained.

[Production Example 2: Synthesis of polymer containing monomer unit represented by formula (I)]
As monomers of the polymer, methacrylic acid (40 parts), ester bond of octadecyl polyoxyethylene (3-methyl-3-butenyl) ether (ethylene oxide 50 mol adduct) (10 parts), and ethyl acrylate (50 parts) ), Except that methacrylic acid (40 parts), octadecyl polyoxyethylene acrylate ester bond (ethylene oxide 50 mol adduct) (10 parts), and ethyl acrylate (50 parts) were used. The coating film finishing agent 2 was obtained by the same method.

[Comparative Example 1: Synthesis of polymer having no monomer unit represented by formula (I)]
As monomers of the polymer, methacrylic acid (40 parts), ester bond of octadecyl polyoxyethylene (3-methyl-3-butenyl) ether (ethylene oxide 50 mol adduct) (10 parts), and ethyl acrylate (50 parts) ) Was used in the same manner as in Example 1 except that methacrylic acid (35 parts) and ethyl acrylate (65 parts) were used.

<Example 1>
[Composition of paint for evaluation]
・ Acrylic resin emulsion [made by Nippon Shokubai Co., Ltd., trade name: Acre Reset EX-35] 300 parts ... Em1
-White paste 60 parts In addition, a white paste is a dispersing agent [The Kao Corporation make, brand name: Demol EP] 60 parts, A dispersing agent [Daiichi Kogyo Seiyaku Co., Ltd. brand name: DISCOAT N-14] 50 parts, wetting agent [trade name: Emulgen LS-106, manufactured by Kao Corporation], 10 parts, propylene glycol, 60 parts, deionized water, 210 parts, titanium oxide [Ishihara Sangyo Co., Ltd., product number: CR-97] It was prepared by dispersing 1000 parts, 10 parts of a foam suppressor [manufactured by San Nopco, trade name: Nopco 8034L] and 500 parts of glass beads (diameter: 1 mm) with a homodisper at a rotational speed of 3000 min-1 for 60 minutes. .
Film-forming auxiliary (butyl cellosolve 15 parts, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate [manufactured by Chisso Corporation, product number: CS-12] 15 parts]
・ 10 parts of black paste (manufactured by Yokohama Chemical Co., Ltd., trade name: UNILANT 88)
-Antifoaming agent [San Nopco Co., Ltd., trade name: Nopco 8034L] 1.5 parts-Water 40 parts-Thickener [Adeka Co., Ltd., trade name: Adecanol UH-550] 0.5 parts Film finishing agent [Production Example 1] A coating for evaluation was prepared by stirring 3 parts or more with a homodisper at a rotational speed of 1500 min-1 for 20 minutes.

<Example 2>
The same procedure as in Example 1 was performed except that the coating film finishing agent of Example 1 was changed to Production Example 2.

<Example 3>
The same operation as in Example 1 was performed except that the white paste of Example 1 was changed to 120 parts and changed to 60 parts of water.

<Example 4>
The same operation as in Example 1 was performed except that the white paste of Example 1 was changed to 10 parts and changed to 20 parts of water.

<Example 5>
The same procedure as in Example 1 was carried out except that the emulsion of Example 1 was changed to Nippon Shokubai Co., Ltd. acrylic silicon emulsion, trade name: Udouble E-771SI ... Em2.

<Example 6>
The same operation as in Example 1 was performed except that the amount of the coating film finishing agent in Example 1 was changed to 1 part.

<Coating conditions>
15 parts of water was added to 100 parts of the obtained paint, and various substrates were coated by air spray so that the coating amount was 100 g / m2. Immediately after coating, the coating film was dried for 10 minutes with a 150 ° C. jet dryer.

<Evaluation>

<Coating smoothness>
The surface smoothness of the coating film on each substrate was measured with “VG2000 manufactured by Nippon Denshoku Industries Co., Ltd.” and evaluated based on the following criteria.
(Evaluation criteria)
5: 60 ° specular value 82 or more 4: 60 ° specular value 80 or more and less than 82 3: 60 ° specular value 75 or more and less than 80 2: 60 ° specular value 70 or more and less than 75 1: 60 ° specular value 70

Claims (3)

In one molecule, the following formula (I):

The coating-film finish characterized by including the polymer containing the monomer unit represented by these. A coating composition comprising the coating film finish according to claim 1. A coating film formed by applying the coating composition according to claim 2.