Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
  • C08G18/6275—Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double bonds
  • C08G18/6279—Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double bonds containing fluorine atoms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
  • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
  • B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
  • B32B15/095—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyurethanes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
  • C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
  • C08G18/3821—Carboxylic acids; Esters thereof with monohydroxyl compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
  • C08G18/78—Nitrogen
  • C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
  • C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
  • C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/10—Esters; Ether-esters
  • C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
  • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
  • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
  • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
  • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
  • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D201/00—Coating compositions based on unspecified macromolecular compounds
  • C09D201/02—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
  • C09D201/04—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing halogen atoms
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/08—Anti-corrosive paints
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/65—Additives macromolecular

Definitions

• the invention relates to compositions, coating films, fluorine-containing coating films, and laminates.
• Coatings containing polyaspartic acid esters are known for their ability to form coating films having high hardness and excellent solvent resistance.
• Patent Literature 1 discloses a coating containing: a) a polyisocyanate component; b1) a polyaspartic acid ester; and b2) a polyaldimine or polyketimine.
• Patent Literature 2 discloses a coating composition capable of forming a thick coating film that has excellent adhesiveness, is not cracked even by heating, and has excellent weather resistance.
• This coating composition contains: A) a polyisocyanate component; B) a polyaspartic acid ester; C) a polyaldimine or polyketimine; D) an acetal; E) castor oil; F) an organic solvent; and G) a pigment.
• Patent Literature 1 JP H07-305025 A
• Patent Literature 2 JP 2000-26799 A
• Offshore structures or port facilities require not only reduction of damages due to sunlight or rainwater but also reduction of damages due to salt.
• Some offshore structures or port facilities are installed far away from the land, and are not easy to repair in such cases.
• coating films formed to protect them cannot be easily repainted.
• coatings currently used therefor need repainting every three to five years. This unfortunately causes an increase in the maintenance cost and, in the cases of offshore structures contributing to petroleum production, a reduction in the productivity due to suspension of the production for maintenance.
• coating films applied thereto need to enable a shorter working time and to have high salt water resistance and weather resistance. In order to achieve these requirements, improvement is required in conventional coatings containing polyaspartic acid esters.
• the invention aims to provide a composition capable of forming a coating film that is excellent in salt water resistance and weather resistance and is less likely to deteriorate for a long time.
• the invention relates to a composition containing a polyaspartic acid ester and a fluoropolymer.
• the polyaspartic acid ester is preferably represented by the following formula (1):
• X is an n-valent group obtainable from an organic polyamine that contains n primary amino groups bonding to an acyclic or cyclic aliphatic structure and that has a number average molecular weight of 88 to 400 by removing the primary amino groups therefrom;
• R 1 and R 2 are the same as or different from each other, and are each a C1-C18 organic group; and n is an integer of 2 or greater.
• the fluoropolymer is preferably a curable functional group-containing fluoropolymer.
• the fluoropolymer is preferably a hydroxy-containing fluoropolymer.
• the polyaspartic acid ester and the fluoropolymer preferably have a mass ratio of 5/95 to 95/5.
• composition preferably further contains a curing agent, and the curing agent is preferably a polyisocyanate compound.
• composition preferably further contains a solvent.
• the composition preferably serves as a coating.
• the composition preferably serves as a coating to be applied to an offshore structure or a port facility.
• the invention also relates to a coating film obtainable from the above composition.
• the coating film preferably has a thickness of 100 to 1000 ⁇ m.
• the invention also relates to a fluorine-containing coating film containing a urethane bond and a urea bond and exhibiting a corrosion from scribe of 1 mm or shorter.
• the fluorine-containing coating film preferably has a thickness of 100 to 1000 ⁇ m.
• the invention also relates to a laminate including a base and the above coating film or fluorine-containing coating film.
• the laminate preferably further includes a layer formed of epoxy resin.
• the base is preferably formed of iron.
• the composition of the invention Since the composition of the invention has the above configuration, it is capable of forming a coating film that is excellent in salt water resistance and weather resistance and that is less likely to deteriorate for a long time. Also, the composition can form a thick coating film by a single coating process. Thus, the working is completed in a short time even when a thick coating film is required.
• the coating film of the invention has the above configuration, it is excellent in salt water resistance and weather resistance and is less likely to deteriorate for a long time.
• the fluorine-containing coating film of the invention has the above configuration, it is excellent in salt water resistance and weather resistance and is less likely to deteriorate for a long time.
• the laminate of the invention Since the laminate of the invention has the above configuration, it is excellent in salt water resistance and weather resistance and is less likely to deteriorate for a long time.
• composition of the invention contains a polyaspartic acid ester and a fluoropolymer.
• the polyaspartic acid ester is preferably a polyaspartic acid ester represented by the following formula (1):
• X is an n-valent group obtainable from an organic polyamine that contains n primary amino groups bonding to an acyclic or cyclic aliphatic structure and that has a number average molecular weight of 88 to 400 by removing the primary amino groups therefrom;
• R 1 and R 2 are the same as or different from each other, and are each a C1-C18 organic group; and n is an integer of 2 or greater.
• n is 2.
• X is preferably a C6-C30 divalent hydrocarbon group, preferably a group obtainable by removing the amino groups from 1-amino-3,3,5-trimethyl-5-aminomethylcyclohexane, 4,4′-diaminodicyclohexylmethane, 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane, hexahydro-2,4-diaminotoluene, hexahydro-2,6-diaminotoluene, isomeric C-monomethyl diaminodicyclohexylmethane, or 3(4)-aminomethyl-1-methylcyclohexylamine, more preferably a divalent hydrocarbon group obtainable by removing the amino groups from 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane.
• R 1 and R 2 are each preferably a methyl group, an ethyl group, an n-butyl group, or a 2-ethylhexyl group, more preferably an ethyl group.
• the polyaspartic acid ester can be produced by a known method in which a primary polyamine represented by the formula: X—(—NH 2 ) n (wherein n and X are defined as mentioned above) is reacted with a maleic acid ester or fumaric acid ester represented by the formula: R 1 OOC—CH ⁇ CH—COOR 2 (wherein R 1 and R 2 are defined as mentioned above).
• the polyaspartic acid ester, the production method thereof, and the polyamine and the maleic acid ester or fumaric acid ester used in the production may be those disclosed in JP H07-305025 A and JP H10-87583 A.
• the fluoropolymer may be either a resin polymer having a clear melting point or an elastomeric polymer exhibiting rubber elasticity, or may be a thermoplastic elastomeric polymer between them.
• the fluoropolymer is preferably a curable functional group-containing fluoropolymer.
• the curable functional group include a hydroxy group, a carboxy group, a group represented by —COOCO—, an amino group, a glycidyl group, a silyl group, a silanate group, and an isocyanate group.
• the curable functional group is selected as appropriate in accordance with the easiness of producing the polymer and the curing system. From the viewpoint of good curing reactivity, preferred is a hydroxy group, a carboxy group, a group represented by —COOCO—, an amino group, or a silyl group. From the viewpoints of easy availability of the polymer and good reactivity, particularly preferred is a hydroxy group.
• These curable functional groups are usually introduced into fluoropolymers by copolymerizing monomers containing the curable functional groups.
• the fluoropolymer is preferably a hydroxy-containing fluoropolymer.
• the hydroxy group can be introduced into the fluoropolymer by copolymerizing a hydroxy-containing monomer.
• the fluoropolymer preferably has a hydroxyl value of 1 to 600 mgKOH/g.
• the hydroxyl value is more preferably 30 mgKOH/g or more, still more preferably 40 mgKOH/g or more.
• the hydroxyl value is more preferably 400 mgKOH/g or less, still more preferably 200 mgKOH/g or less.
• the hydroxyl value is a value determined by the method in conformity with JIS K0070.
• the fluoropolymer preferably contains a polymerized unit derived from a fluorine-containing monomer and a polymerized unit derived from a hydroxy-containing monomer.
• fluorine-containing monomer examples include tetrafluoroethylene, chlorotrifluoroethylene, vinylidene fluoride, vinyl fluoride, and fluorovinyl ether. One of them or two or more of them may be used.
• Preferred among these is at least one selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, and vinylidene fluoride, and more preferred is at least one selected from the group consisting of tetrafluoroethylene and chlorotrifluoroethylene.
• the polymerized unit derived from a fluorine-containing monomer preferably represents 15 to 50 mol % of all the polymerized units of the fluoropolymer.
• the lower limit of this value is more preferably 20 mol %, still more preferably 30 mol %, particularly preferably 40 mol %.
• the upper limit thereof is more preferably 49 mol %, still more preferably 47 mol %.
• hydroxy-containing monomer examples include hydroxy-containing vinyl ethers such as 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 2-hydroxypropyl vinyl ether, 2-hydroxy-2-methylpropyl vinyl ether, 4-hydroxybutyl vinyl ether, 4-hydroxy-2-methylbutyl vinyl ether, 5-hydroxypentyl vinyl ether, and 6-hydroxyhexyl vinyl ether; and hydroxy-containing allyl ethers such as 2-hydroxyethyl allyl ether, 4-hydroxybutyl allyl ether, and glycerol monoallyl ether.
• hydroxy-containing vinyl ethers such as 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 2-hydroxypropyl vinyl ether, 2-hydroxy-2-methylpropyl vinyl ether, 4-hydroxybutyl vinyl ether, 4-hydroxy-2-methylbutyl vinyl ether, 5-hydroxypentyl vinyl ether, and 6-hydroxyhexyl vinyl ether
• hydroxy-containing allyl ethers such
• hydroxy-containing vinyl ethers preferred are hydroxy-containing monomers represented by the formula (2): CH 2 ⁇ CH—(CH 2 ) 1 —O—(CH 2 ) m —OH (wherein 1 is 0 or 1; and m is an integer of 2 or greater), and still more preferred is at least one monomer selected from the group consisting of 4-hydroxybutyl vinyl ether, 2-hydroxyethyl vinyl ether, 2-hydroxyethyl allyl ether, and 4-hydroxybutyl allyl ether.
• hydroxy-containing monomers examples include hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate.
• the polymerized unit derived from a hydroxy-containing monomer preferably represents 8 to 30 mol % of all the polymerized units constituting the fluoropolymer.
• the lower limit of this value is more preferably 10 mol % while the upper limit thereof is more preferably 20 mol %.
• the fluoropolymer also preferably further contains a polymerized unit of at least one selected from the group consisting of carboxy-containing monomers, amino-containing monomers, and silyl-containing monomers. These polymerized units preferably represent 8 to 30 mol % of all the polymerized units constituting the fluoropolymer. The lower limit of this value is more preferably 10 mol %, while the upper limit thereof is more preferably 20 mol %.
• the carboxy-containing monomers are each preferably at least one monomer selected from the group consisting of carboxy-containing monomers represented by the following formula (3):
• R 3 , R 4 , and R 5 are the same as or different from each other, and are each a hydrogen atom, an alkyl group, a carboxy group, an acyloxy group, or an alkoxycarbonyl group; and n is an integer of 0 or greater), and esters and acid anhydrides thereof, and carboxy-containing vinyl ether monomers represented by the following formula (4):
• R 6 and R 7 are the same as or different from each other, and are each a saturated or unsaturated linear, branched, or cyclic alkylene group; n is 0 or 1; and m is 0 or 1).
• carboxy-containing monomers include acrylic acid, methacrylic acid, vinylacetic acid, crotonic acid, pentenoic acid, hexenoic acid, heptenoic acid, octenoic acid, nonenoic acid, decenoic acid, undecylenic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, octadecenoic acid, nonadecenoic acid, eicosenoic acid, 22-tricosenoic acid, cinnamic acid, itaconic acid, itaconic acid monoesters, maleic acid, maleic acid monoesters, maleic anhydride, fumaric acid, fumaric acid monoesters, vinyl phthalate, vinyl pyromellitate, 3-allyloxypropionic acid, 3-(2-allyloxyethoxycarbonyl
• At least one acid selected from the group consisting of crotonic acid, undecylenic acid, itaconic acid, maleic acid, maleic acid monoesters, fumaric acid, fumaric acid monoesters, 3-allyloxypropionic acid, and 3-(2-allyloxyethoxycarbonyl)propionic acid.
• silyl-containing monomers examples include silicone vinyl monomers.
• silicone vinyl monomers include (meth)acrylic acid esters such as CH 2 ⁇ CHCO 2 (CH 2 ) 3 Si(OCH 3 ) 3 , CH 2 ⁇ CHCO 2 (CH 2 ) 3 Si(OC 2 H 5 ) 3 , CH 2 ⁇ C(CH 3 )CO 2 (CH 2 ) 3 Si(OCH 3 ) 3 , CH 2 ⁇ C(CH 3 )CO 2 (CH 2 ) 3 Si(OC 2 H 5 ) 3 , CH 2 ⁇ CHCO 2 (CH 2 ) 3 SiCH 3 (OC 2 H 5 ) 2 , CH 2 ⁇ C(CH 3 )CO 2 (CH 2 ) 3 SiC 2 H 5 (OCH 3 ) 2 , CH 2 ⁇ C(CH 3 )CO 2 (CH 2 ) 3 SiC 2 H 5 (OCH 3 ) 2 , CH 2 ⁇ C(CH 3 )CO 2 (CH 2 ) 3 Si(CH 3 ) 2 (OC 2
• the fluoropolymer preferably contains a polymerized unit derived from at least one fluorine-free vinyl monomer selected from the group consisting of vinyl carboxylates, alkyl vinyl ethers, and non-fluorinated olefins.
• the vinyl carboxylates have an effect of improving the compatibility.
• examples of the vinyl carboxylates include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl pivalte, vinyl caproate, vinyl versatate, vinyl laurate, vinyl stearate, vinyl cyclohexylcarboxylate, vinyl benzoate, and vinyl para-t-butylbenzoate.
• alkyl vinyl ethers examples include methyl vinyl ether, ethyl vinyl ether, butyl vinyl ether, and cyclohexyl vinyl ether.
• non-fluorinated olefins examples include ethylene, propylene, n-butene, and isobutene.
• fluoropolymer examples include: (1) perfluoroolefin polymers mainly composed of a perfluoroolefin unit; (2) chlorotrifluoroethylene (CTFE) polymers mainly composed of a CTFE unit; (3) vinylidene fluoride (VdF) polymers mainly composed of a VdF unit; (4) fluoroalkyl-containing polymers mainly composed of a fluoroalkyl unit; and (5) vinyl acetate polymers mainly composed of a vinyl acetate unit.
• CTFE chlorotrifluoroethylene
• VdF vinylidene fluoride
• the fluoropolymer is preferably any of the polymers (1), (2), and (5) among the above fluoropolymers (1) to (5).
• the perfluoroolefin polymers mainly composed of a perfluoroolefin unit each preferably contain a perfluoroolefin unit.
• the perfluoroolefin unit preferably represents 20 to 49 mol % of all the polymerized units of the perfluoroolefin polymer.
• the lower limit of this value is more preferably 30 mol %, still more preferably 40 mol %.
• the upper limit thereof is more preferably 47 mol %.
• perfluoroolefin examples include tetrafluoroethylene (TFE), hexafluoropropylene (HFP), and perfluoro(alkyl vinyl ethers) (PAVEs). From the viewpoints of excellent pigment dispersibility, weather resistance, copolymerizability, and chemical resistance, preferred among these is TFE.
• the perfluoroolefin polymer preferably contains a unit of a different monomer copolymerizable with the perfluoroolefin.
• Examples of the copolymerizable monomer include, but are not limited to, vinyl carboxylates such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl caproate, vinyl versatate, vinyl laurate, vinyl stearate, vinyl cyclohexylcarboxylate, vinyl benzoate, and vinyl para-t-butylbenzoate; alkyl vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, butyl vinyl ether, and cyclohexyl vinyl ether; non-fluoroolefins such as ethylene, propylene, n-butene, and isobutene; and fluoromonomers such as vinylidene fluoride (VdF), chlorotrifluoroethylene (CTFE), vinyl fluoride (VF), and fluorovinyl ether.
• VdF vinylidene fluoride
• CTFE chlorotrifluoroethylene
• Examples of the perfluoroolefin polymer mainly composed of a perfluoroolefin unit include copolymers of TFE/isobutylene/hydroxybutyl vinyl ether/different monomer, copolymers of TFE/vinyl versatate/hydroxybutyl vinyl ether/different monomer, and copolymers of TFE/VdF/hydroxybutyl vinyl ether/different monomer. Particularly preferred is at least one copolymer selected from the group consisting of copolymers of TFE/isobutylene/hydroxybutyl vinyl ether/different monomer and copolymers of TFE/vinyl versatate/hydroxybutyl vinyl ether/different monomer.
• Examples of coatings of such curable polymers include Zeffle® GK series (Daikin Industries, Ltd.).
• CTFE Polymers Mainly Composed of a Chlorotrifluoroethylene (CTFE) Unit
• CTFE polymers mainly composed of a CTFE unit include copolymers of CTFE/hydroxybutyl vinyl ether/different monomer.
• curable polymer coatings of the CTFE polymers include Lumiflon® (Asahi Glass Co., Ltd.), Fluonate® (DIC Corp.), and Cefral Coat® (Central Glass Co., Ltd.).
• VdF Polymers Mainly Composed of a Vinylidene Fluoride (VdF) Unit
• VdF polymers mainly composed of a VdF unit examples include copolymers of VdF/TFE/hydroxybutyl vinyl ether/different monomer.
• Fluoroalkyl-Containing Polymers Mainly Composed of a Fluoroalkyl Unit
• fluoroalkyl-containing polymers include Unidyne® and Ftone® (Daikin Industries, Ltd.), and Zonyl® (DuPont).
• Examples of the vinyl acetate polymers mainly composed of a vinyl acetate unit include copolymers of fluorine-containing monomer/vinyl acetate/hydroxy-containing monomer represented by the formula (2)/carboxy-containing monomer represented by the formula (3).
• the copolymers each preferably satisfy that the mole ratio of fluorine-containing monomer/vinyl acetate/hydroxy-containing monomer represented by the formula (2)/carboxy-containing monomer represented by the formula (3) is (15 to 50)/(20 to 75)/(5 to 22)/(0.1 to 5).
• the hydroxy-containing monomer represented by the formula (2) is preferably at least one monomer selected from the group consisting of hydroxyethyl vinyl ether (HEVE), hydroxybutyl vinyl ether (HBVE), 2-hydroxyethyl allyl ether, and 4-hydroxybutyl allyl ether.
• HEVE hydroxyethyl vinyl ether
• HBVE hydroxybutyl vinyl ether
• 2-hydroxyethyl allyl ether 2-hydroxyethyl allyl ether
• 4-hydroxybutyl allyl ether 4-hydroxybutyl allyl ether.
• n in the carboxy-containing monomer represented by the formula (3) is preferably as great as possible.
• n is 2 or greater, more preferably 4 or greater, still more preferably 8 or greater.
• the upper limit thereof may be 20, for example.
• the carboxy-containing monomer represented by the formula (3) is preferably at least one selected from the group consisting of pentenoic acid, hexenoic acid, heptenoic acid, octenoic acid, nonenoic acid, decenoic acid, undecylenic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, octadecenoic acid, nonadecenoic acid, eicosenoic acid, and 22-tricosenoic acid, more preferably undecylenic acid.
• the copolymer may contain a different monomer unit.
• the different monomer unit preferably represents either 0 mol % or 25 mol % or less of all the structural units constituting the copolymer.
• Examples of the different monomer include non-aromatic vinyl esters other than vinyl acetate.
• Examples of the non-aromatic vinyl esters include vinyl versatate, vinyl laurate, vinyl stearate, and vinyl cyclohexylcarboxylate.
• the vinyl acetate polymer preferably has a number average molecular weight of 3000 to 100000.
• the number average molecular weight is more preferably 5000 or more, still more preferably 8000 or more, while more preferably 50000 or less, still more preferably 35000 or less.
• the number average molecular weight can be determined by gel permeation chromatography (GPC) using tetrahydrofuran as an eluent.
• the vinyl acetate polymer preferably has a glass transition temperature (second run) of 10° C. to 70° C., more preferably 14° C. to 60° C., determined with a differential scanning calorimeter (DSC).
• second run 10° C. to 70° C., more preferably 14° C. to 60° C., determined with a differential scanning calorimeter (DSC).
• DSC differential scanning calorimeter
• the vinyl acetate polymer preferably has an acid value of 0.6 to 28.8 mgKOH/g, more preferably 2 to 12 mgKOH/g.
• the acid value is determined in conformity with JIS K5601.
• the vinyl acetate polymer preferably has a hydroxyl value of 29 to 120 mgKOH/g, more preferably 100 mgKOH/g or less.
• the hydroxyl value can be calculated from the actual amount and solid content of the hydroxy monomers used in the polymerization.
• the fluoropolymer can be produced by the method disclosed in JP 2004-204205 A or JP 2013-177536 A, for example.
• the composition of the fluoropolymer can be determined by techniques such as elemental analysis and NMR analysis.
• the polyaspartic acid ester and the fluoropolymer preferably have a mass ratio of 5/95 to 95/5, more preferably 20/80 to 80/20. Too small an amount of the polyaspartic acid ester tends to cause a failure in thickening each layer, while too small an amount of the fluoropolymer tends to cause a failure in imparting sufficient weather resistance and salt water resistance.
• the mass ratio of the polyaspartic acid ester and the fluoropolymer is preferably lower than 50/50.
• the composition preferably further contains a curing agent.
• the curing agent include polyisocyanate compounds, melamine resins, silicate compounds, and isocyanate group-containing silane compounds. Preferred are polyisocyanate compounds.
• polyisocyanate compounds include, but are not limited to, 2,4-tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate, xylylene diisocyanate, isophorone diisocyanate, lysine methyl ester diisocyanate, methyl cyclohexyl diisocyanate, trimethyl hexamethylene diisocyanate, hexamethylene diisocyanate, n-pentane-1,4-diisocyanate, trimers thereof, adduct products, biuret products, or isocyanurate products thereof, polymers thereof containing two or more isocyanate groups, and block isocyanates.
• Preferred as the polyisocyanate compounds is hexamethylene diisocyanate.
• One example of the polyisocyanate compounds is Desmodur N3900 (available from Bayer).
• the amount of the curing agent is preferably 10 to 75 mass %, more preferably 20 mass % or more, while more preferably 65 mass % or less, relative to the polyaspartic acid ester and the fluoropolymer.
• the composition may further contain a solvent.
• the solvent is preferably an organic solvent, and examples thereof include esters such as ethyl acetate, butyl acetate, isopropyl acetate, isobutyl acetate, cellosolve acetate, methoxypropyl acetate, and propylene glycol methyl ether acetate; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; cyclic ethers such as tetrahydrofuran and dioxane; amides such as N,N-dimethyl formamide and N,N-dimethyl acetamide; aromatic hydrocarbons such as xylene, toluene, and solvent naphtha; glycol ethers such as propylene glycol methyl ether and ethyl cellosolve; diethylene glycol esters such as carbitol acetate; aliphatic
• composition when containing a solvent, preferably contains 5 to 95 mass %, more preferably 10 to 70 mass %, of the polyaspartic acid ester and the fluoropolymer in total.
• the composition may further contain various additives in accordance with the characteristics required.
• the additives include a curing accelerator, a curing retarder, a pigment, a pigment dispersant, an antifoam, a leveling agent, an ultraviolet absorber, a photostabilizer, a thickening agent, an adhesion promoter, and a flatting agent.
• the composition preferably contains the pigment.
• the pigment include titanium oxide, talc, and barium sulfate.
• the composition is capable of forming a coating film that is excellent in salt water resistance and weather resistance and that is less likely to deteriorate for a long time, it can suitably be used as a coating, especially as a coating to be applied to offshore structures or port facilities.
• a coating film obtainable by applying the composition to a base is also excellent in adhesion to the base. Thus, the coating film can restrain corrosion of the base due to permeation of salt.
• Applying the composition to a base or to a layer disposed on the base provides a coating film.
• the composition can form a coating film having a thickness of 100 ⁇ m or greater by a single coating process.
• a coating film formed by a single coating process has a thickness of at most smaller than 100 ⁇ m.
• a coating film obtainable from the composition is also one aspect of the invention.
• the coating film of the invention is excellent in salt water resistance and weather resistance and is less likely to deteriorate for a long time.
• the coating film of the invention is also excellent in adhesion to a base, and can restrain corrosion of the base due to permeation of salt.
• composition may be applied by, for example, spray coating, roll coating, dip (immersion) coating, impregnation coating, spin-flow coating, curtain-flow coating, or coating with a roller, a brush, or a doctor blade.
• the composition applied to the base may be dried.
• the polyaspartic acid ester is one represented by the formula (1)
• the fluoropolymer contains a hydroxy group
• the composition contains a curing agent
• the polyaspartic acid ester, the fluoropolymer, and the curing agent undergo a curing reaction during the drying to provide a coating film that has much better salt water resistance and weather resistance and is much less likely to deteriorate for a long time.
• the curing reaction sufficiently proceeds even at room temperature.
• the coating film preferably has a hardness of H or higher.
• the hardness may be 4H or lower.
• the hardness is determined with a pencil hardness tester in conformity with JIS K5600.
• the coating film preferably has a thickness of 10 ⁇ m or greater, more preferably 30 ⁇ m or greater, still more preferably 100 ⁇ m or greater, while preferably 1000 ⁇ m or smaller, more preferably 800 ⁇ m or smaller.
• the coating film preferably exhibits a corrosion from scribe of 1 mm or shorter.
• a fluorine-containing coating film containing a urethane bond and a urea bond and exhibiting a corrosion from scribe of 1 mm or shorter is also one aspect of the invention.
• the fluorine-containing coating film contains a urethane bond and a urea bond and exhibits a corrosion from scribe of 1 mm or shorter, it is excellent in salt water resistance and weather resistance and is less likely to deteriorate for a long time.
• the fluorine-containing coating film refers to a coating film containing a fluorine atom.
• the presence of a fluorine atom in the coating film can be confirmed by techniques such as elemental analysis and NMR analysis.
• the presence of the urethane bond and urea bond in the fluorine-containing coating film can be confirmed by an infrared absorption spectrum.
• the corrosion from scribe refers to a degree of progress of rusting.
• the corrosion from scribe can be determined as follows. First, a laminate including a base and the coating film or fluorine-containing coating film is prepared. Next, a scribe is made in the coating film or fluorine-containing coating film such that the scribe reaches the base, and salt water is sprayed on the laminate for 1440 hours. Then, the coating film or fluorine-containing coating film is peeled off the base, and the length of the rust extending from the scribe on the base surface (the maximum length thereof in the direction perpendicular to the scribe) is measured.
• the base used may be a base made of metal, and is preferably a base made of iron, more preferably a base made of steel.
• the fluorine-containing coating film preferably has a hardness of H or higher.
• the hardness may be 4H or lower.
• the hardness is determined using a pencil hardness tester in conformity with JIS K5600.
• the fluorine-containing coating film preferably has a thickness of 10 ⁇ m or greater, more preferably 30 ⁇ m or greater, still more preferably 100 ⁇ m or greater, while preferably 1000 ⁇ m or smaller, more preferably 800 ⁇ m or smaller.
• the fluorine-containing coating film can be produced from the aforementioned composition.
• the invention also relates to a laminate including a base and the aforementioned coating film or the aforementioned fluorine-containing coating film.
• the coating film or fluorine-containing coating film may be disposed directly on the base, or may be disposed on the base with a different layer in between.
• the different layer is preferably a primer layer.
• the different layer is preferably a layer formed of epoxy resin, urethane resin, acrylic resin, silicone resin, or polyester resin, more preferably a layer formed of epoxy resin.
• the base may be formed of a material such as metallic material, plastic, or concrete.
• the material is preferably the metallic material, more preferably iron, aluminum, stainless steel, or copper, still more preferably iron, particularly preferably steel.
• a pencil hardness test was performed in conformity with JIS K5600.
• a cross-hatch test (1 mm ⁇ 1 mm ⁇ 100 squares) was performed in conformity with JIS K5600, and the adhesion was evaluated by the number of remaining squares.
• An accelerated weathering test was performed for 50 hours and 80 hours using an accelerated weathering tester with hydrogen peroxide.
• the number of blisters generated and the average area thereof were determined, and the blistering area relative to the whole area of the coated sample plate was calculated.
• the thickness was measured using an overcurrent thickness meter.
• a scribe was made in the coating film of the coated plate formed in each example, and salt water was sprayed thereon for 1440 hours.
• the coating film was peeled off, and the length of the rust extending from the scribe (the maximum length thereof in the direction perpendicular to the scribe) was measured.
• the quantity and size of the blisters in the coating film were measured in conformity with ISO 4628-2 (JIS K5600-8-2).
• the rusting was determined in conformity with ISO 4628-3 (JIS K5600-8-3).
• the cracking was determined in conformity with ISO 4628-4 (JIS K5600-8-4).
• the flaking was determined in conformity with ISO 4628-5 (JIS K5600-8-5).
• An epoxy primer base resin, an epoxy primer curing agent, and an epoxy thinner were mixed at a ratio shown in Table 1 to provide a coating composition.
• This coating composition was sprayed on an aluminum plate and a blast plate (SS400), and then cured and dried at room temperature for one day. Thereby, 30- ⁇ m cured coating films (1st Coats) were obtained.
• a polyaspartic acid ester (Desmophen NH1520, Bayer), Zeffle GK-570 (solid content: 65%, Daikin Industries, Ltd.), R960 (DuPont), and butyl acetate were mixed in amounts shown in Table 1, and Desmodur N3900 (Bayer) serving as a curing agent was mixed therewith to provide a coating composition.
• This coating composition was sprayed on the cured coating films (1st Coats) which were formed in advance.
• the coating compositions were dried at room temperature for two hours. Thereby, a coated plate (aluminum plate) and a coated plate (blast plate) each having a cured coating film (2nd Coat) were obtained.
• the coated plate (aluminum plate) the pencil hardness, the cross-hatch test, the gloss, and the accelerated weathering resistance (blistering area) were assessed.
• the salt water resistance was assessed.
• the peak derived from a urea bond was observed around 1720 cm ⁇ 1 and the peak derived from a urethane bond was observed around 1650 cm ⁇ 1 .
• Table 1 The other results are shown in Table 1.
• a coating composition was prepared in the same manner as in Example 1 except that the quantity ratio of the polyaspartic acid ester (Desmophen NH1520, Bayer) and Zeffle GK-570 (solid content: 65%, Daikin Industries, Ltd.) was changed.
• the coating composition was applied in the same manner as in Example 1 and dried at room temperature for two hours. Thereby, a coated plate (aluminum plate) and a coated plate (blast plate) each having a cured coating film (2nd Coat) were obtained.
• the coated plate (aluminum plate) the pencil hardness, the cross-hatch test, the gloss, and the accelerated weathering resistance (blistering area) were assessed.
• the salt water resistance was assessed. In the infrared absorption spectrum, the peak derived from a urea bond was observed around 1720 cm ⁇ 1 and the peak derived from a urethane bond was observed around 1650 cm ⁇ 1 .
• Table 1 The other results are shown in Table 1.
• a polyaspartic acid ester (Desmophen NH1520, Bayer), Zeffle GK-570 (solid content: 65%, Daikin Industries, Ltd.), R960 (DuPont), and butyl acetate were mixed in amounts shown in Table 1, and Desmodur N3900 (Bayer) serving as a curing agent was mixed therewith to provide a coating composition.
• This coating composition was sprayed on an aluminum plate and a blast plate (SS400). The coating compositions were dried at room temperature for two hours. Thereby, a coated plate (aluminum plate) and a coated plate (blast plate) each having a 300- ⁇ m cured coating film were obtained.
• the infrared absorption spectrum For the coated plate (aluminum plate), the infrared absorption spectrum, the pencil hardness, the cross-hatch test, the gloss, and the accelerated weathering resistance (blistering area) were assessed.
• the coated plate for the coated plate (blast plate), the salt water resistance was assessed.
• the peak derived from a urea bond was observed around 1720 cm ⁇ 1 and the peak derived from a urethane bond was observed around 1650 cm ⁇ 1 .
• Table 1 The other results are shown in Table 1.
• a coating composition was prepared in the same manner as in Example 1 except that the formulation was changed as shown in Table 1.
• the coating composition was applied in the same manner as in Example 1 and dried at room temperature for two hours. Thereby, a coated plate (aluminum plate) and a coated plate (blast plate) each having a cured coating film (2nd Coat) were obtained.
• a coated plate aluminum plate
• a coated plate a coated plate
• a coated plate each having a cured coating film (2nd Coat) were obtained.
• the coated plate (aluminum plate) the pencil hardness, the cross-hatch test, the gloss, and the accelerated weathering resistance (blistering area) were assessed.
• the coated plate (blast plate) the salt water resistance was assessed.
• the peak derived from a urea bond was observed around 1720 cm ⁇ 1 and the peak derived from a urethane bond was observed around 1650 cm ⁇ 1 .
• Table 1 The other results are shown in Table 1.
• a coating composition was prepared in the same manner as in Example 1 except that Lumiflon LF200 (solid content: 60%, Asahi Glass Co., Ltd.) was used and the formulation was changed as shown in Table 1.
• the coating composition was applied in the same manner as in Example 1 and dried at room temperature for two hours. Thereby, a coated plate (aluminum plate) and a coated plate (blast plate) each having a cured coating film (2nd Coat) were obtained.
• the coated plate (aluminum plate) the pencil hardness, the cross-hatch test, the gloss, and the accelerated weathering resistance (blistering area) were assessed.
• the salt water resistance was assessed. In the infrared absorption spectrum, the peak derived from a urea bond was observed around 1720 cm ⁇ 1 and the peak derived from a urethane bond was observed around 1650 cm ⁇ 1 .
• Table 1 The other results are shown in Table 1.
• An epoxy primer base resin, an epoxy primer curing agent, and an epoxy thinner were mixed at a ratio shown in Table 1 to provide a coating composition.
• This coating composition was sprayed on an aluminum plate and a blast plate (SS400), and then cured and dried at room temperature for one day. Thereby, 30- ⁇ m cured coating films (1st Coats) were obtained.
• a polyaspartic acid ester (Desmophen NH1520, Bayer), R960 (DuPont), and butyl acetate were mixed and Desmodur N3900 (Bayer) serving as a curing agent was mixed therewith to provide a coating composition.
• This coating composition was sprayed on the cured coating films (1st Coats) which were formed in advance.
• the coating compositions were dried at room temperature for two hours. Thereby, a coated plate (aluminum plate) and a coated plate (blast plate) each having a cured coating film (2nd Coat) were obtained.
• a coated plate aluminum plate
• a coated plate a coated plate
• a coated plate a coated plate (blast plate) each having a cured coating film (2nd Coat) were obtained.
• the coated plate aluminum plate
• the pencil hardness, the cross-hatch test, the gloss, and the accelerated weathering resistance (blistering area) were assessed.
• the coated plate (blast plate) the salt water resistance was assessed.
• the peak derived from a urea bond was observed around 1720 cm ⁇ , but no peak derived from a urethane bond was observed. The other results are shown in Table 1.
• a polyaspartic acid ester (Desmophen NH1520, Bayer), R960 (DuPont), and butyl acetate were mixed and Desmodur N3900 (Bayer) serving as a curing agent was mixed therewith to provide a coating composition.
• This coating composition was sprayed on an aluminum plate and a blast plate (SS400). The coating compositions were dried at room temperature for two hours. Thereby, a coated plate (aluminum plate) and a coated plate (blast plate) each having a cured coating film were obtained.
• the coated plate (aluminum plate)
• Example 6 Example 7 Example 1 ative ponents Unit 1st Coat 2nd Coat 1st Coat 2nd Coat 1st Coat 2nd Coat Example 2
• Epoxy phr 80.0 80.0 mu- primer lation base resin Epoxy phr 20.0 20.0 20.0 primer curing agent poly- phr 22.2 14.8 37.9 37.9 aspartic acid ester Zeffle phr GK570 (65% solid) Lumiflon phr 15.6 57.5 LF200 (60% solid) R960 phr 26.2 37.6 31.8 31.8 Butyl phr 26.7 45.1 21.4 21.4 acetate Desmodur phr 16.7 16.4 25 25 N3900 Epoxy phr 60.0 60.0 60.0 thinner Thickness ⁇ m 30 220 30 220 30 205 230 Hardness Pencil B B H H hardness Adhesion Cross- 100/100 100/100 100/100 20/100 hatch test Accelerated Gloss Initial 89 90 92 90 weather
• Table 1 demonstrates that the coating films containing both a urethane bond and a urea bond exerted the effects.

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