JP2018039983A - Aqueous coating material, and coating film formation method - Google Patents
Aqueous coating material, and coating film formation method Download PDFInfo
- Publication number
- JP2018039983A JP2018039983A JP2017138895A JP2017138895A JP2018039983A JP 2018039983 A JP2018039983 A JP 2018039983A JP 2017138895 A JP2017138895 A JP 2017138895A JP 2017138895 A JP2017138895 A JP 2017138895A JP 2018039983 A JP2018039983 A JP 2018039983A
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- JP
- Japan
- Prior art keywords
- meth
- hydroxyl group
- acrylate
- containing monomer
- coating material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 238000000576 coating method Methods 0.000 title claims abstract description 51
- 239000011248 coating agent Substances 0.000 title claims abstract description 48
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 16
- 230000015572 biosynthetic process Effects 0.000 title 1
- -1 isocyanate compound Chemical class 0.000 claims abstract description 82
- 239000000178 monomer Substances 0.000 claims abstract description 65
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 50
- 239000000839 emulsion Substances 0.000 claims abstract description 28
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 26
- 239000000057 synthetic resin Substances 0.000 claims abstract description 26
- 239000012948 isocyanate Substances 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 claims abstract description 19
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- 239000001257 hydrogen Substances 0.000 claims abstract description 9
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 9
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 81
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 18
- 239000003795 chemical substances by application Substances 0.000 description 13
- 239000000049 pigment Substances 0.000 description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 9
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 8
- 239000003995 emulsifying agent Substances 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 7
- 125000000217 alkyl group Chemical group 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 239000003999 initiator Substances 0.000 description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 6
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000012965 benzophenone Substances 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920001451 polypropylene glycol Polymers 0.000 description 4
- 239000000344 soap Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N 1,4-butanediol Substances OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 3
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 3
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000007259 addition reaction Methods 0.000 description 3
- 239000008199 coating composition Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000005056 polyisocyanate Substances 0.000 description 3
- 229920001228 polyisocyanate Polymers 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N propylene glycol Substances CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- DSTUKHPLWATFCG-UHFFFAOYSA-N (2-benzoylphenyl) prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1C(=O)C1=CC=CC=C1 DSTUKHPLWATFCG-UHFFFAOYSA-N 0.000 description 2
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 2
- JLIDVCMBCGBIEY-UHFFFAOYSA-N 1-penten-3-one Chemical compound CCC(=O)C=C JLIDVCMBCGBIEY-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- BQBSIHIZDSHADD-UHFFFAOYSA-N 2-ethenyl-4,5-dihydro-1,3-oxazole Chemical compound C=CC1=NCCO1 BQBSIHIZDSHADD-UHFFFAOYSA-N 0.000 description 2
- GRNHZMGFVFTJHF-UHFFFAOYSA-N 2-hydroxyacetic acid;prop-2-enamide Chemical compound NC(=O)C=C.OCC(O)=O GRNHZMGFVFTJHF-UHFFFAOYSA-N 0.000 description 2
- QOXOZONBQWIKDA-UHFFFAOYSA-N 3-hydroxypropyl Chemical group [CH2]CCO QOXOZONBQWIKDA-UHFFFAOYSA-N 0.000 description 2
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 description 2
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- YAQXJPBLJAFSFJ-UHFFFAOYSA-N acetyl acetate;prop-2-enoic acid Chemical compound OC(=O)C=C.CC(=O)OC(C)=O YAQXJPBLJAFSFJ-UHFFFAOYSA-N 0.000 description 2
- 125000005907 alkyl ester group Chemical group 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000012964 benzotriazole Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 238000002296 dynamic light scattering Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 2
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- DTGKSKDOIYIVQL-WEDXCCLWSA-N (+)-borneol Chemical group C1C[C@@]2(C)[C@@H](O)C[C@@H]1C2(C)C DTGKSKDOIYIVQL-WEDXCCLWSA-N 0.000 description 1
- QEQBMZQFDDDTPN-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy benzenecarboperoxoate Chemical compound CC(C)(C)OOOC(=O)C1=CC=CC=C1 QEQBMZQFDDDTPN-UHFFFAOYSA-N 0.000 description 1
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical compound C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 description 1
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- MJYFYGVCLHNRKB-UHFFFAOYSA-N 1,1,2-trifluoroethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(F)(F)CF MJYFYGVCLHNRKB-UHFFFAOYSA-N 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
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- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
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- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
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- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
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- 239000004014 plasticizer Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- JEXVQSWXXUJEMA-UHFFFAOYSA-N pyrazol-3-one Chemical compound O=C1C=CN=N1 JEXVQSWXXUJEMA-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- IZMJMCDDWKSTTK-UHFFFAOYSA-N quinoline yellow Chemical compound C1=CC=CC2=NC(C3C(C4=CC=CC=C4C3=O)=O)=CC=C21 IZMJMCDDWKSTTK-UHFFFAOYSA-N 0.000 description 1
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- 239000011342 resin composition Substances 0.000 description 1
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- 229960004889 salicylic acid Drugs 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
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- 239000000758 substrate Substances 0.000 description 1
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- 239000000454 talc Substances 0.000 description 1
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、新規な水性被覆材、及び被膜形成方法に関する。 The present invention relates to a novel aqueous coating material and a film forming method.
従来より、水酸基含有化合物とイソシアネート化合物から形成されるウレタン被覆材は、硬化性や、耐候性等の物性において優れた性能を示すことから、汎用的に用いられている。
近年、溶剤系から水系への転換が進むなか、ウレタン被覆材分野においても例外ではなく、溶剤系から水系への転換が求められている。例えば、特許文献１には、アクリル共重合体の水溶液又は水分散体、及びウレタンディスパージョンを含有する水系樹脂組成物の主剤に、自己乳化型ポリイソシアネートを配合した二液型水系上塗り塗料組成物が記載されている。
Conventionally, a urethane coating material formed from a hydroxyl group-containing compound and an isocyanate compound has been widely used because it exhibits excellent performance in physical properties such as curability and weather resistance.
In recent years, as the transition from solvent-based systems to water-based systems progresses, there is no exception in the urethane coating material field, and conversion from solvent-based systems to aqueous systems is required. For example, Patent Document 1 discloses a two-part water-based top coating composition in which a self-emulsifying polyisocyanate is blended with an aqueous resin composition containing an aqueous solution or dispersion of an acrylic copolymer and a urethane dispersion. Is described.
しかしながら、特許文献１等に記載の塗料組成物を塗装して被膜を乾燥させた後、被膜上に再度同じ塗料組成物を塗装しても、十分な密着性が得られ難い場合があった。 However, even when the coating composition described in Patent Document 1 is applied and the film is dried and then the same coating composition is applied again on the coating, it may be difficult to obtain sufficient adhesion.
本発明者らは、上記問題を解決するために鋭意検討した結果、特定の水酸基含有アクリル樹脂エマルションと水分散性イソシアネート化合物を用いることによって、水性被覆材を重ね塗りして被膜形成する場合において、相互の被膜密着性を十分に確保することができることに想到し、本発明の完成に至った。 As a result of intensive studies to solve the above problems, the present inventors have used a specific hydroxyl group-containing acrylic resin emulsion and a water-dispersible isocyanate compound to form a film by recoating an aqueous coating material. The inventors have conceived that mutual film adhesion can be sufficiently secured, and have completed the present invention.
すなわち、本発明は以下の特徴を有するものである。
１．（Ａ）水酸基含有合成樹脂エマルション、
（Ｂ）水分散性イソシアネート化合物、
を含有する水性被覆材であって、
（Ａ）水酸基含有合成樹脂エマルションは、酸価５ｍｇＫＯＨ／ｇ以下であり、
該合成樹脂を構成する水酸基含有モノマーとして、下記（式１）で示される１級水酸基含有モノマー（ａ）を、水酸基含有モノマー中６０重量％以上含むことを特徴とする水性被覆材。
（式１）
ＣＨ２＝Ｃ−Ｒ１
│
Ｏ＝Ｃ
＼
Ｏ−Ｒ２−ＯＨ
（Ｒ１は水素またはメチル基、Ｒ２は炭素数３以上１２以下の直鎖状または分岐状アルキレン鎖。）
２．同種の水性被覆材を重ね塗りする被膜形成方法であって、当該水性被覆材は、
（Ａ）水酸基含有合成樹脂エマルション、
（Ｂ）水分散性イソシアネート化合物、
を含有し、
（Ａ）水酸基含有合成樹脂エマルションは、酸価５ｍｇＫＯＨ／ｇ以下であり、
該合成樹脂を構成する水酸基含有モノマーとして、下記（式１）で示される１級水酸基含有モノマー（ａ）を、水酸基含有モノマー中６０重量％以上含むことを特徴とする被膜形成方法。
（式１）
ＣＨ２＝Ｃ−Ｒ１
│
Ｏ＝Ｃ
＼
Ｏ−Ｒ２−ＯＨ
（Ｒ１は水素またはメチル基、Ｒ２は炭素数３以上１２以下の直鎖状または分岐状アルキレン鎖。）
That is, the present invention has the following characteristics.
1. (A) a hydroxyl group-containing synthetic resin emulsion,
(B) a water-dispersible isocyanate compound,
An aqueous coating material containing
(A) The hydroxyl group-containing synthetic resin emulsion has an acid value of 5 mgKOH / g or less,
An aqueous coating material comprising a primary hydroxyl group-containing monomer (a) represented by the following (formula 1) as a hydroxyl group-containing monomer constituting the synthetic resin in an amount of 60% by weight or more in the hydroxyl group-containing monomer.
(Formula 1)
CH 2 = C-R 1
│
O = C
\
O—R 2 —OH
(R 1 is hydrogen or a methyl group, and R 2 is a linear or branched alkylene chain having 3 to 12 carbon atoms.)
2. A method of forming a film by repeatedly applying the same type of aqueous coating material,
(A) a hydroxyl group-containing synthetic resin emulsion,
(B) a water-dispersible isocyanate compound,
Containing
(A) The hydroxyl group-containing synthetic resin emulsion has an acid value of 5 mgKOH / g or less,
A film-forming method comprising, as a hydroxyl group-containing monomer constituting the synthetic resin, a primary hydroxyl group-containing monomer (a) represented by the following (formula 1): 60% by weight or more in the hydroxyl group-containing monomer.
(Formula 1)
CH 2 = C-R 1
│
O = C
\
O—R 2 —OH
(R 1 is hydrogen or a methyl group, and R 2 is a linear or branched alkylene chain having 3 to 12 carbon atoms.)
本発明の水性被覆材は、重ね塗りして被膜を得る場合に、相互の被膜密着性を十分に確保することができる。 The aqueous coating material of the present invention can sufficiently secure mutual film adhesion when it is overcoated to obtain a film.
以下、本発明を実施するための形態について説明する。 Hereinafter, modes for carrying out the present invention will be described.
本発明の水性被覆材は、（Ａ）水酸基含有合成樹脂エマルションと（Ｂ）水分散性イソシアネート化合物を含有するものである。 The aqueous coating material of the present invention contains (A) a hydroxyl group-containing synthetic resin emulsion and (B) a water-dispersible isocyanate compound.
本発明の（Ａ）水酸基含有合成樹脂エマルション（以下「（Ａ）成分」ともいう。）は、酸価５ｍｇＫＯＨ／ｇ以下（好ましくは３ｍｇＫＯＨ／ｇ以下、より好ましくは０．８ｍｇＫＯＨ／ｇ以下、さらに好ましくは０ｍｇＫＯＨ／ｇ以上０．３ｍｇＫＯＨ／ｇ以下）であることを特徴とする。また、酸価を有さない態様も好適である。このような範囲を満たす場合、本発明の水性被覆材を重ね塗りして被膜形成した場合、相互の被膜密着性を十分に確保することができる。なお、本発明において「酸価」は、樹脂１ｇ中に含まれる酸基が全て遊離した酸であると仮定して、それを中和するために必要な水酸化カリウムのｍｇ数の計算値で表す。これは、酸基（例えば、カルボキシル基等）を含有しエチレン性二重結合を有するモノマー（以下、単に「酸基含有モノマー」ともいう）が含む酸基と対応する。本発明に係る「酸価」は、下記式で求めることができる。
酸価（ｍｇＫＯＨ／ｇ）＝（酸基含有モノマーの重量／酸基含有モノマーの分子量）×酸基含有モノマー１モルに含まれる酸基のモル数×ＫＯＨの分子量（５６．１）×１０００／（Ａ）水酸基含有合成樹脂エマルションの重量（固形分）
The (A) hydroxyl group-containing synthetic resin emulsion of the present invention (hereinafter also referred to as “component (A)”) has an acid value of 5 mgKOH / g or less (preferably 3 mgKOH / g or less, more preferably 0.8 mgKOH / g or less, Preferably, it is 0 mgKOH / g or more and 0.3 mgKOH / g or less). Moreover, the aspect which does not have an acid value is also suitable. When satisfying such a range, when the aqueous coating material of the present invention is repeatedly applied to form a film, mutual film adhesion can be sufficiently ensured. In the present invention, the “acid value” is a calculated value of the number of mg of potassium hydroxide necessary to neutralize the acid group, assuming that the acid group contained in 1 g of the resin is all free. Represent. This corresponds to an acid group contained in a monomer containing an acid group (for example, a carboxyl group) and having an ethylenic double bond (hereinafter, also simply referred to as “acid group-containing monomer”). The “acid value” according to the present invention can be determined by the following formula.
Acid value (mg KOH / g) = (weight of acid group-containing monomer / molecular weight of acid group-containing monomer) × number of moles of acid group contained in 1 mole of acid group-containing monomer × molecular weight of KOH (56.1) × 1000 / (A) Weight of hydroxyl group-containing synthetic resin emulsion (solid content)
本発明の（Ａ）水酸基含有合成樹脂エマルションは、水酸基含有モノマーを他の共重合可能なモノマーと共重合して得られるものである。
本発明では、水酸基含有モノマーとして、下記（式１）で示される１級水酸基含有モノマー（ａ）（「（ａ）成分」ともいう。）を、水酸基含有モノマー中６０重量％以上（好ましくは８０重量％以上、より好ましくは９０重量％以上１００重量％以下）を含むことを特徴とする。また、（ａ）成分が水酸基含有モノマー中１００重量％の態様も好適である。このような比率であれば、本発明の水性被覆材を重ね塗りして被膜形成した場合、相互の被膜密着性をより一層高めることができる。
（式１）
ＣＨ２＝Ｃ−Ｒ１
│
Ｏ＝Ｃ
＼
Ｏ−Ｒ２−ＯＨ
（Ｒ１は水素またはメチル基、Ｒ２は炭素数３以上１２以下（好ましくは３以上５以下）の直鎖状または分岐状アルキレン鎖。）
The (A) hydroxyl group-containing synthetic resin emulsion of the present invention is obtained by copolymerizing a hydroxyl group-containing monomer with another copolymerizable monomer.
In the present invention, the primary hydroxyl group-containing monomer (a) (also referred to as “component (a)”) represented by the following (formula 1) is used as the hydroxyl group-containing monomer in an amount of 60% by weight or more (preferably 80%). Wt% or more, more preferably 90 wt% or more and 100 wt% or less). Moreover, the aspect whose (a) component is 100 weight% in a hydroxyl-containing monomer is also suitable. If it is such a ratio, when the aqueous coating material of this invention is applied repeatedly and a film is formed, mutual film adhesiveness can be improved further.
(Formula 1)
CH 2 = C-R 1
│
O = C
\
O—R 2 —OH
(R 1 is hydrogen or a methyl group, and R 2 is a linear or branched alkylene chain having 3 to 12 carbon atoms (preferably 3 to 5 carbon atoms).)
（ａ）成分としては、例えば、３−ヒドロキシプロピル（メタ）アクリレート、４−ヒドロキシブチル（メタ）アクリレート、１−メチル−４−ヒドロキシブチル（メタ）アクリレート、５−ヒドロキシペンチル（メタ）アクリレート、６−ヒドロキシヘキシル（メタ）アクリレート、７−ヒドロキシヘプチル（メタ）アクリレート、８−ヒドロキシオクチル（メタ）アクリレート、２−メチル−８−ヒドロキシオクチル（メタ）アクリレート、７−メチル−８−ヒドロキシオクチル（メタ）アクリレート、９−ヒドロキシノニル（メタ）アクリレート、１０−ヒドロキシデシル（メタ）アクリレート等が挙げられ、本発明では特に、３−ヒドロキシプロピル（メタ）アクリレート、４−ヒドロキシブチル（メタ）アクリレート、５−ヒドロキシペンチル（メタ）アクリレートから選ばれる１種以上が、さらには４−ヒドロキシブチル（メタ）アクリレートが好適に用いられる。 Examples of the component (a) include 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1-methyl-4-hydroxybutyl (meth) acrylate, 5-hydroxypentyl (meth) acrylate, 6 -Hydroxyhexyl (meth) acrylate, 7-hydroxyheptyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 2-methyl-8-hydroxyoctyl (meth) acrylate, 7-methyl-8-hydroxyoctyl (meth) Acrylate, 9-hydroxynonyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, and the like. In the present invention, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 5-hydro One or more selected from Shipenchiru (meth) acrylate, more 4-hydroxybutyl (meth) acrylate is preferably used.
上記（ａ）成分以外の水酸基含有モノマーとして、下記（式２）で示される水酸基含有モノマー及び／又は下記（式３）で示される２級または３級水酸基含有モノマーを使用することができる。
（式２）
ＣＨ２＝Ｃ−Ｒ１
│
Ｏ＝Ｃ
＼
Ｏ−ＣＨ２−ＣＨ２−ＯＨ
（Ｒ１は水素またはメチル基。）
（式３）
ＣＨ２＝Ｃ−Ｒ１
│
Ｏ＝Ｃ Ｒ４
＼ │
Ｏ−Ｒ３−ＣＨ２−ＯＨ
│
Ｒ５
（Ｒ１は水素またはメチル基、Ｒ３は炭素数１以上９以下の直鎖状アルキレン鎖、Ｒ４、Ｒ５は水素または炭素数１以上１０以下の直鎖状及び／または分岐状アルキル基でありＲ４とＲ５の炭素数の合計が１以上１０以下。）
As the hydroxyl group-containing monomer other than the component (a), a hydroxyl group-containing monomer represented by the following (Formula 2) and / or a secondary or tertiary hydroxyl group-containing monomer represented by the following (Formula 3) can be used.
(Formula 2)
CH 2 = C-R 1
│
O = C
\
O—CH 2 —CH 2 —OH
(R 1 is hydrogen or a methyl group.)
(Formula 3)
CH 2 = C-R 1
│
O = C R 4
\ │
O—R 3 —CH 2 —OH
│
R 5
(R 1 is hydrogen or a methyl group, R 3 is a linear alkylene chain having 1 to 9 carbon atoms, R 4 and R 5 are hydrogen or a linear and / or branched alkyl group having 1 to 10 carbon atoms. And the total number of carbon atoms of R 4 and R 5 is 1 or more and 10 or less.)
（式２）で示される水酸基含有モノマーとしては、２−ヒドロキシエチル（メタ）アクリレートが挙げられる。
（式３）で示される２級または３級水酸基含有モノマーとしては、例えば、２−ヒドロキシプロピル（メタ）アクリレート、２−ヒドロキシブチル（メタ）アクリレート、２−ヒドロキシペンチル（メタ）アクリレート、４−ヒドロキシペンチル（メタ）アクリレート、１−メチル−４−ヒドロキシペンチル（メタ）アクリレート、３−エチル−３−ヒドロキシヘキシル（メタ）アクリレート、２−ヒドロキシデシル（メタ）アクリレート等が挙げられる。
Examples of the hydroxyl group-containing monomer represented by (Formula 2) include 2-hydroxyethyl (meth) acrylate.
Examples of the secondary or tertiary hydroxyl group-containing monomer represented by (Formula 3) include 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxypentyl (meth) acrylate, and 4-hydroxy. Examples include pentyl (meth) acrylate, 1-methyl-4-hydroxypentyl (meth) acrylate, 3-ethyl-3-hydroxyhexyl (meth) acrylate, and 2-hydroxydecyl (meth) acrylate.
本発明の（Ａ）水酸基含有合成樹脂エマルションは、水酸基含有モノマー（上記（式１）、（式２）及び（式３）を含む）を全モノマーに対し好ましくは１０重量％以上４０重量％以下（より好ましくは１５重量％以上３０重量％以下）含む。このような範囲であれば、安定性、硬化性、耐溶剤性、硬度等に優れた水性被覆材を得ることができる。 The (A) hydroxyl group-containing synthetic resin emulsion of the present invention is preferably 10% by weight to 40% by weight of the hydroxyl group-containing monomer (including the above (formula 1), (formula 2) and (formula 3)) with respect to all monomers. (More preferably 15 wt% or more and 30 wt% or less). If it is such a range, the aqueous coating material excellent in stability, sclerosis | hardenability, solvent resistance, hardness, etc. can be obtained.
上記水酸基含有モノマーと共重合可能なモノマーとしては、例えば、
（メタ）アクリル酸、クロトン酸、マレイン酸、イタコン酸、フマル酸、イソクロトン酸、サリチル酸、けい皮酸等のカルボキシル基含有モノマー、
３−（メタ）アクリロキシプロピルトリメトキシシラン、３−（メタ）アクリロキシプロピルメチルジメトキシシラン、３−（メタ）アクリロキシプロピルトリエトキシシシラン、３−（メタ）アクリロキシプロピルメチルジエトキシシラン、ビニルトリメトキシシシシラン、ビニルトリエトキシシシラン、ビニルトリイソプロポキシシラン等のアルコキシシリル基含有モノマー、
（メタ）アクリルアミド、エチル（メタ）アクリルアミド、Ｎ−エチル（メタ）アクリルアミド、Ｎ−イソプロピル（メタ）アクリルアミド、Ｎ−ｎ−プロピル（メタ）アクリルアミド、Ｎ−シクロプロピル（メタ）アクリルアミド、Ｎ−（メタ）アクロイルピロリジン、Ｎ，Ｎ−ジメチル（メタ）アクリルアミド、Ｎ，Ｎ−ジエチル（メタ）アクリルアミド、Ｎ−メチル−Ｎ−エチル（メタ）アクリルアミド、Ｎ−メチル−Ｎ−イソプロピル（メタ）アクリルアミド、Ｎ−メチル−Ｎ−ｎ−プロピル（メタ）アクリルアミド、Ｎ−メチロール（メタ）アクリルアミド、Ｎ−［３−（ジメチルアミノ）プロピル］（メタ）アクリルアミド、ビニルアミド、Ｎ，Ｎ−メチレンビスアクリルアミド、ジアセトン（メタ）アクリルアミド、Ｎ−メチロール（メタ）アクリルアミド、アクリルアミドグリコール酸、アクリルアミドグリコール酸メチル、ジメトキシヒドロキシエチルアクリルアミド等のアミド基含有モノマー、
メチル（メタ）アクリレート、エチル（メタ）アクリレート、イソプロピル（メタ）アクリレート、ｎ−プロピル（メタ）アクリレート、ｉ−ブチル（メタ）アクリレート、ｎ−ブチル（メタ）アクリレート、ｓｅｃ−ブチル（メタ）アクリレート、イソブチル（メタ）アクリレート、ｔ−ブチル（メタ）アクリレート、２−エチルヘキシル（メタ）アクリレート、ｎ−ヘキシル（メタ）アクリレート、オクチル（メタ）アクリレート、ラウリル（メタ）アクリレート、ステアリル（メタ）アクリレート、ミリスチル（メタ）アクリレート、パルミチル（メタ）アクリレート、トリフルオロエチル（メタ）アクリレート、ｎ−アミル（メタ）アクリレート、イソアミル（メタ）アクリレート、ｔ−アミル（メタ）アクリレート、オキチル（メタ）アクリレート、デシル（メタ）アクリレート、ドデシル（メタ）アクリレート、ドデセニル（メタ）アクリレート、オクタデシル（メタ）アクリレート、フェニル（メタ）アクリレート、イソボルニル（メタ）アクリレート、ベンジル（メタ）アクリレート、２−フェニルエチル（メタ）アクリレート、２−メトキシエチル（メタ）アクリレート、４−メトキシブチル（メタ）アクリレート、シクロペンチル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、メチルシクロヘキシル（メタ）アクリレート、ｔ−ブチルシクロヘキシル（メタ）アクリレート、ヒドロキシメチルシクロヘキシル（メタ）アクリレート、シクロオクチル（メタ）アクリレート、シクロデシル（メタ）アクリレート、シクロドデシル（メタ）アクリレート、４−ｔｅｒｔ−ブチルシクロヘキシル（メタ）アクリレート、トリプロピルメチル（メタ）アクリレート、トリイソプロピルメチル（メタ）アクリレート、トリブチルメチル（メタ）アクリレート、トリイソブチルメチル（メタ）アクリレート、トリｔ−ブチルメチル（メタ）アクリレート、４−ｔｅｒｔ−ブチルシクロヘキシル（メタ）アクリレート等のアルキル基含有モノマー、
（メトキシ）ポリエチレングリコール（メタ）アクリレート、（メトキシ）ポリプロピレングリコール（メタ）アクリレート、（メトキシ）ポリエチレングリコール−ポリプロピレングリコール（メタ）アクリレート、（メトキシ）ポリエチレングリコールアリルエーテル、（メトキシ）ポリプロピレングリコールアリルエーテル、（メトキシ）ポリエチレングリコール−ポリプロピレングリコールアリルエーテル等のアルキレングリコール鎖含有モノマー、
ブチルビニルベンジルアミン、ビニルフェニルアミン、ｐ−アミノスチレン、Ｎ，Ｎ−ジメチルアミノエチル（メタ）アクリレート、Ｎ，Ｎ−ジメチルアミノプロピル（メタ）アクリレート、Ｎ，Ｎ−ジエチルアミノエチル（メタ）アクリレート、Ｎ，Ｎ−ジメチルアミノプロピル（メタ）アクリレート、Ｎ，Ｎ−ジエチルアミノプロピル（メタ）アクリレート、Ｎ−〔２−（メタ）アクリロイルオキシエチル〕ピペリジン、Ｎ−〔２−（メタ）アクリロイルオキシエチル〕ピロリジン、Ｎ−〔２−（メタ）アクリロイルオキシエチル〕モルホリン、４−〔Ｎ，Ｎ−ジメチルアミノ〕スチレン、４−〔Ｎ，Ｎ−ジエチルアミノ〕スチレン、２−ビニルピリジン、４−ビニルピリジン等のアミノ基含有モノマー、
グリシジル（メタ）アクリレート、ジグリシジルフマレート、３，４−エポキシシクロヘキシル（メタ）アクリレート、３，４−エポキシビニルシクロヘキサン、アリルグリシジルエーテル、ε−カプロラクトン変性グリシジル（メタ）アクリレート、β−メチルグリシジル（メタ）アクリレート等のグリシジル基含有モノマー、
ジアセトン（メタ）アクリレート、ジアセトン（メタ）アクリルアミド、アクロレイン、ビニルメチルケトン、ビニルエチルケトン、ビニル（イソ）ブチルケトン、アセトニルアクリレート、アクリルオキシアルキルプロパナール類、メタクリルオキシアルキルプロパナール類、２−ヒドロキシプロピルアクリレートアセチルアセテート、タンジオールアクリレートアセチルアセテート、アセトアセトキシエチル（メタ）アクリレート、アセトアセトキシアリルエステル等のカルボニル基含有モノマー、
アクリロニトリル、メタアクリロニトリル等のニトリル基含有モノマー、
メタクリロイルイソシアネートなどのイソシアネート基含有モノマー、
ビニルオキサゾリン、２−ビニル−２−オキサゾリン、２−プロペニル２−オキサゾリン等のオキサゾリン基含有モノマー、
プロピレン−１，３−ジヒドラジン及びブチレン−１，４−ジヒドラジンなどのヒドラジノ基含有モノマー、
アセトアセトキシエチル（メタ）アクリレート、アセトアセトキシアリルエステル等のアセトアセトキシル基含有モノマー、
Ｎ−メチロール（メタ）アクリルアミド等のメチロール基含有モノマー、
フッ化ビニリデン等のハロゲン化ビニリデン系モノマー、
スチレン、２−メチルスチレン、クロロスチレン、ビニルトルエン、ｔ−ブチルスチレン、ビニルアニソール、ビニルナフタレン等の芳香族ビニル系モノマー、
スチレンスルホン酸、ビニルスルホン酸などのスルホン酸含有モノマー、
２−ヒドロキシ−４−（メタ）アクリロキシベンゾフェノン、２−ヒドロキシ−５−（メタ）アクリロキシベンゾフェノン、２−ヒドロキシ−４−｛（メタ）アクリロキシ−エトキシ｝ベンゾフェノン、２−ヒドロキシ−４−｛（メタ）アクリロキシ−ジエトキシ｝ベンゾフェノン、２−ヒドロキシ−４−｛（メタ）アクリロキシ−トリエトキシ｝ベンゾフェノン等のベンゾフェノン系モノマー、
２−｛２’−ヒドロキシ−５’−（メタ）アクリロキシエチルフェニル｝−２Ｈ−ベンゾトリアゾール、２−｛２’−ヒドロキシ−５’−（メタ）アクリロキシエチル−３−ｔ−ブチルフェニル｝−２Ｈ−ベンゾトリアゾール、３−（メタ）アクリロイル−２−ヒドロキシプロピル−３−｛３’−（２’’−ベンゾトリアゾール）−４−ヒドロキシ−５−ｔ−ブチル｝フェニルプロピオネート等のベンゾトリアゾール系モノマー、
エチレン、プロピレン、イソプレン、ブタジエン、酢酸ビニル、プロピオン酸ビニル、酪酸ビニル、ピバリン酸ビニル、バーサチック酸ビニルエステル、ビニルエーテル、ビニルケトン等のその他のモノマー、
等が挙げられ、これらのうち１種または２種以上を用いることができる。
As a monomer copolymerizable with the hydroxyl group-containing monomer, for example,
Carboxyl group-containing monomers such as (meth) acrylic acid, crotonic acid, maleic acid, itaconic acid, fumaric acid, isocrotonic acid, salicylic acid, cinnamic acid,
3- (meth) acryloxypropyltrimethoxysilane, 3- (meth) acryloxypropylmethyldimethoxysilane, 3- (meth) acryloxypropyltriethoxysilane, 3- (meth) acryloxypropylmethyldiethoxysilane, Alkoxysilyl group-containing monomers such as vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane,
(Meth) acrylamide, ethyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, Nn-propyl (meth) acrylamide, N-cyclopropyl (meth) acrylamide, N- (meth) ) Acroylpyrrolidine, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-methyl-N-ethyl (meth) acrylamide, N-methyl-N-isopropyl (meth) acrylamide, N -Methyl-Nn-propyl (meth) acrylamide, N-methylol (meth) acrylamide, N- [3- (dimethylamino) propyl] (meth) acrylamide, vinylamide, N, N-methylenebisacrylamide, diacetone (meta ) Acrylamide, N-methyl Lumpur (meth) acrylamide, acrylamide glycolic acid, acrylamide glycolic acid, amide group-containing monomers such as dimethoxy-hydroxyethyl acrylamide,
Methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-propyl (meth) acrylate, i-butyl (meth) acrylate, n-butyl (meth) acrylate, sec-butyl (meth) acrylate, Isobutyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-hexyl (meth) acrylate, octyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, myristyl ( (Meth) acrylate, palmityl (meth) acrylate, trifluoroethyl (meth) acrylate, n-amyl (meth) acrylate, isoamyl (meth) acrylate, t-amyl (meth) acrylate, octyl (meth) ) Acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, dodecenyl (meth) acrylate, octadecyl (meth) acrylate, phenyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, 2-phenylethyl ( (Meth) acrylate, 2-methoxyethyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, methylcyclohexyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, Hydroxymethylcyclohexyl (meth) acrylate, cyclooctyl (meth) acrylate, cyclodecyl (meth) acrylate, cyclododecyl (meth) acrylic 4-tert-butylcyclohexyl (meth) acrylate, tripropylmethyl (meth) acrylate, triisopropylmethyl (meth) acrylate, tributylmethyl (meth) acrylate, triisobutylmethyl (meth) acrylate, tri-t-butylmethyl ( Alkyl group-containing monomers such as (meth) acrylate and 4-tert-butylcyclohexyl (meth) acrylate,
(Methoxy) polyethylene glycol (meth) acrylate, (methoxy) polypropylene glycol (meth) acrylate, (methoxy) polyethylene glycol-polypropylene glycol (meth) acrylate, (methoxy) polyethylene glycol allyl ether, (methoxy) polypropylene glycol allyl ether, ( Methoxy) polyethylene glycol-polypropylene glycol allyl ether alkylene glycol chain-containing monomer,
Butyl vinyl benzylamine, vinyl phenyl amine, p-aminostyrene, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N , N-dimethylaminopropyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate, N- [2- (meth) acryloyloxyethyl] piperidine, N- [2- (meth) acryloyloxyethyl] pyrrolidine, Amino groups such as N- [2- (meth) acryloyloxyethyl] morpholine, 4- [N, N-dimethylamino] styrene, 4- [N, N-diethylamino] styrene, 2-vinylpyridine, 4-vinylpyridine, etc. Containing monomer,
Glycidyl (meth) acrylate, diglycidyl fumarate, 3,4-epoxycyclohexyl (meth) acrylate, 3,4-epoxyvinylcyclohexane, allyl glycidyl ether, ε-caprolactone modified glycidyl (meth) acrylate, β-methylglycidyl (meta ) Glycidyl group-containing monomers such as acrylate,
Diacetone (meth) acrylate, diacetone (meth) acrylamide, acrolein, vinyl methyl ketone, vinyl ethyl ketone, vinyl (iso) butyl ketone, acetonyl acrylate, acryloxyalkylpropanals, methacryloxyalkylpropanals, 2-hydroxypropyl Carbonyl group-containing monomers such as acrylate acetyl acetate, tandiol acrylate acetyl acetate, acetoacetoxyethyl (meth) acrylate, acetoacetoxyallyl ester,
Nitrile group-containing monomers such as acrylonitrile and methacrylonitrile
Isocyanate group-containing monomers such as methacryloyl isocyanate,
Oxazoline group-containing monomers such as vinyl oxazoline, 2-vinyl-2-oxazoline, 2-propenyl 2-oxazoline,
Hydrazino group-containing monomers such as propylene-1,3-dihydrazine and butylene-1,4-dihydrazine,
Acetoacetoxyl group-containing monomers such as acetoacetoxyethyl (meth) acrylate and acetoacetoxyallyl ester,
Methylol group-containing monomers such as N-methylol (meth) acrylamide,
Vinylidene halide monomers such as vinylidene fluoride,
Aromatic vinyl monomers such as styrene, 2-methylstyrene, chlorostyrene, vinyltoluene, t-butylstyrene, vinylanisole, vinylnaphthalene,
Sulfonic acid-containing monomers such as styrene sulfonic acid and vinyl sulfonic acid,
2-hydroxy-4- (meth) acryloxybenzophenone, 2-hydroxy-5- (meth) acryloxybenzophenone, 2-hydroxy-4-{(meth) acryloxy-ethoxy} benzophenone, 2-hydroxy-4-{( Benzophenone monomers such as (meth) acryloxy-diethoxy} benzophenone, 2-hydroxy-4-{(meth) acryloxy-triethoxy} benzophenone,
2- {2′-hydroxy-5 ′-(meth) acryloxyethylphenyl} -2H-benzotriazole, 2- {2′-hydroxy-5 ′-(meth) acryloxyethyl-3-t-butylphenyl} Benzotriazole such as -2H-benzotriazole, 3- (meth) acryloyl-2-hydroxypropyl-3- {3 '-(2 "-benzotriazole) -4-hydroxy-5-t-butyl} phenylpropionate Monomers,
Other monomers such as ethylene, propylene, isoprene, butadiene, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl pivalate, vinyl versatate, vinyl ether, vinyl ketone,
Etc., and one or more of these can be used.
特に、本発明では、上記水酸基モノマーと共重合可能なモノマーとして、上記アルキル基含有モノマーを含む態様が好適である。さらには、アルキル基含有モノマーとして、アルキル基の炭素数が４以下のものを、アルキル基含有モノマー中８０重量％以上（より好ましくは９０重量％以上、さらに好ましくは９５重量％以上）含むことが好ましい。このような場合、本発明の効果を高めることができる。 In particular, in the present invention, an embodiment including the alkyl group-containing monomer as a monomer copolymerizable with the hydroxyl group monomer is preferable. Furthermore, the alkyl group-containing monomer contains an alkyl group having 4 or less carbon atoms in the alkyl group-containing monomer at 80% by weight or more (more preferably 90% by weight or more, more preferably 95% by weight or more). preferable. In such a case, the effect of the present invention can be enhanced.
本発明（Ａ）水酸基含有合成樹脂エマルションにおいて、カルボキシル基含有モノマーを有する場合、当該モノマー総重量に対するカルボキシル基含有モノマーの重量比率は好ましくは０．８重量％以下、より好ましくは０．４重量％以下、さらには０．１重量％以下、最も好ましくは０重量％以上０．０８重量％以下とする。このような場合、本発明の効果を高めることができる。 In the present invention (A) hydroxyl group-containing synthetic resin emulsion, when having a carboxyl group-containing monomer, the weight ratio of the carboxyl group-containing monomer to the total weight of the monomer is preferably 0.8% by weight or less, more preferably 0.4% by weight. Hereinafter, it is further 0.1% by weight or less, most preferably 0% by weight or more and 0.08% by weight or less. In such a case, the effect of the present invention can be enhanced.
重合方法としては、各種モノマーと、必要に応じ各種添加剤を混合し、通常知られる重合法（乳化重合法、懸濁重合法、分散重合法等）で重合し、合成樹脂エマルションを製造すればよい。 As a polymerization method, various monomers and various additives as necessary are mixed and polymerized by a generally known polymerization method (emulsion polymerization method, suspension polymerization method, dispersion polymerization method, etc.) to produce a synthetic resin emulsion. Good.
添加剤としては、水、乳化剤、開始剤、溶剤、分散剤、乳化安定化剤、重合禁止剤、重合抑制剤、緩衝剤、架橋剤、ｐＨ調整剤、連鎖移動剤、触媒等が挙げられ、各種重合法、目的に応じ、必要量添加すればよい。 Examples of additives include water, emulsifiers, initiators, solvents, dispersants, emulsion stabilizers, polymerization inhibitors, polymerization inhibitors, buffers, crosslinking agents, pH adjusters, chain transfer agents, catalysts, and the like. A necessary amount may be added according to various polymerization methods and purposes.
乳化剤としては、アニオン性乳化剤、カチオン性乳化剤、ノニオン性乳化剤、両イオン性乳化剤、反応性乳化剤等特に限定されず、用いることができる。
例えば、ドデシルベンゼンスルホン酸ナトリウム、ドデシル硫酸ナトリウムなどのアルキルベンゼンスルホン酸塩、脂肪酸塩、ロジン酸塩、アルキル硫酸エステル、アルキルスルホコハク酸塩、α−オレフィンスルホン酸塩、アルキルナフタレンスルホン酸塩、ポリオキシエチレンアルキル（アリール）硫酸エステル塩等のアニオン性乳化剤、
ラウリルトリアルキルアンモニウム塩、ステアリルトリアルキルアンモニウム塩、トリアルキルベンジルアンモニウム塩などの第４級アンモニウム塩、第１級〜第３級アミン塩、ラウリルピリジニウム塩、ベンザルコニウム塩、ベンゼトニウム塩、或は、ラウリルアミンアセテート等のカチオン性界面活性剤、
ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェノールエーテル、ポリオキシエチレンアルキルエステル、ポリオキシエチレンソルビタンアルキルエステル等のノニオン性界面活性剤、
カルボキシベタイン型、スルホベタイン型、アミノカルボン酸型、イミダゾリン誘導体型等の両性界面活性剤、
また、エレミノールＪＳ−２０（三洋化成工業株式会社製）、エレミノールＲＳ−３０（三洋化成工業株式会社製）、ラテムルＳ−１８０Ａ（花王株式会社製）、ラテムルＰＤ−１０４（花王株式会社製）、ラテムルＰＤ−４２０（花王株式会社製）、ラテムルＰＤ−４３０（花王株式会社製）、ラテムルＰＤ−４５０（花王株式会社製）、アクアロンＫＨ−１０（第一工業製薬株式会社製）、アデカリアソープＳＲ−１０（株式会社ＡＤＥＫＡ製）、アデカリアソープＥＲ−２０（株式会社ＡＤＥＫＡ製）、アデカリアソープＥＲ−３０（株式会社ＡＤＥＫＡ製）、アデカリアソープＥＲ−４０（株式会社ＡＤＥＫＡ製）等の反応性乳化剤等が挙げられる。本発明では、特に耐水性等の面から反応性乳化剤の使用が好ましい。
As the emulsifier, an anionic emulsifier, a cationic emulsifier, a nonionic emulsifier, an amphoteric emulsifier, a reactive emulsifier and the like are not particularly limited and can be used.
For example, alkyl benzene sulfonates such as sodium dodecylbenzene sulfonate and sodium dodecyl sulfate, fatty acid salts, rosinates, alkyl sulfates, alkyl sulfosuccinates, α-olefin sulfonates, alkyl naphthalene sulfonates, polyoxyethylenes Anionic emulsifiers such as alkyl (aryl) sulfate esters,
Quaternary ammonium salts such as lauryl trialkyl ammonium salts, stearyl trialkyl ammonium salts, trialkyl benzyl ammonium salts, primary to tertiary amine salts, lauryl pyridinium salts, benzalkonium salts, benzethonium salts, or Cationic surfactants such as laurylamine acetate,
Nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkyl ester,
Amphoteric surfactants such as carboxybetaine type, sulfobetaine type, aminocarboxylic acid type, imidazoline derivative type,
Moreover, Eleminol JS-20 (manufactured by Sanyo Chemical Industries), Eleminol RS-30 (manufactured by Sanyo Chemical Industries), Latemuru S-180A (manufactured by Kao Corporation), Latemuru PD-104 (manufactured by Kao Corporation), Laterum PD-420 (manufactured by Kao Corporation), Laterum PD-430 (manufactured by Kao Corporation), Laterum PD-450 (manufactured by Kao Corporation), Aqualon KH-10 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Adekaria Soap SR-10 (manufactured by ADEKA Co., Ltd.), Adeka Soap ER-20 (manufactured by ADEKA Co., Ltd.), Adeka Soap ER-30 (manufactured by ADEKA Co., Ltd.), Adeka Soap ER-40 (manufactured by ADEKA Co., Ltd.), etc. Examples include reactive emulsifiers. In the present invention, it is particularly preferable to use a reactive emulsifier from the viewpoint of water resistance.
開始剤としては、例えば、過硫酸アンモニウム、過硫酸カリウム、過硫酸ナトリウム等の過硫酸塩開始剤、２，２’−アゾビスイソブチロニトリル、２，２’−アゾビス（２，４’−ジメチルバレロニトリル）、２，２’−アゾビス（２−アミジノプロパン）二塩酸塩、２，２’−アゾビス（２−（２−イミダゾリン−２−イル）プロパン）二塩酸塩等のアゾ系開始剤、過酸化ベンゾイル、ラウロイルパーオキサイド、デカノイルパーオキサイド等のジアルキルパーオキサイド、ｔ−ブチルパーオキシベンゾエート等のパーオキシエステル、クメンハイドロパーオキサイド、パラメンタンハイドロパーオキサイド、ｔ−ブチルハイドロパーオキサイド等のハイドロパーオキサイド等の過酸化系開始剤、レドックス開始剤、光重合開始剤、反応性開始剤等を用いることができる。 Examples of the initiator include persulfate initiators such as ammonium persulfate, potassium persulfate, and sodium persulfate, 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4′-dimethyl). Azo initiators such as valeronitrile), 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis (2- (2-imidazolin-2-yl) propane) dihydrochloride, Dialkyl peroxides such as benzoyl peroxide, lauroyl peroxide, decanoyl peroxide, peroxyesters such as t-butylperoxybenzoate, hydrous such as cumene hydroperoxide, paramentane hydroperoxide, t-butyl hydroperoxide Peroxide initiators such as peroxides, redox initiators, photopolymerization initiators, reactions It can be used initiators.
重合温度は、特に限定されないが、２０℃から９０℃程度であればよい。 The polymerization temperature is not particularly limited, but may be about 20 ° C. to 90 ° C.
合成樹脂エマルションのガラス転移温度は、特に限定されないが、−１０℃以上６０℃以下（さらには０℃以上５０℃以下）であることが好ましい。
なお、ガラス転移温度は、ＦＯＸの計算式より求められる値である。
Although the glass transition temperature of a synthetic resin emulsion is not specifically limited, It is preferable that they are -10 degreeC or more and 60 degrees C or less (further 0 degreeC or more and 50 degrees C or less).
In addition, a glass transition temperature is a value calculated | required from the calculation formula of FOX.
合成樹脂エマルションの平均粒子径は、特に限定されないが、５０ｎｍ〜１０００ｎｍ（好ましくは５０ｎｍ〜５００ｎｍ、さらに好ましくは６０ｎｍ〜３００ｎｍ）であることが好ましい。
なお、平均粒子径は、動的光散乱法により測定した値である。具体的には、動的光散乱測定装置として、マイクロトラック粒度分析計（例えば、ＵＰＡ１５０、日機装株式会社製）を用い、検出された散乱強度をヒストグラム解析法のＭａｒｑｕａｒｄｔ法により解析した値であり、測定温度は２５℃である。
The average particle diameter of the synthetic resin emulsion is not particularly limited, but is preferably 50 nm to 1000 nm (preferably 50 nm to 500 nm, more preferably 60 nm to 300 nm).
The average particle diameter is a value measured by a dynamic light scattering method. Specifically, as a dynamic light scattering measurement device, using a Microtrac particle size analyzer (for example, UPA150, Nikkiso Co., Ltd.), the detected scattering intensity is a value analyzed by the Marquardt method of the histogram analysis method, The measurement temperature is 25 ° C.
本発明水性被覆材における（Ｂ）水分散性イソシアネート化合物（以下「（Ｂ）成分」ともいう。）は、イソシアネート化合物に親水性化合物を導入することにより得られるもので、例えば、イソシアネート化合物に乳化剤を加えたもの、イソシアネート化合物にポリオキシアルキレン基含有化合物を付加反応（変性）させたもの、イソシアネート化合物に水溶性樹脂を付加反応（変性）させたもの等が挙げられる。
本発明では特に、イソシアネート化合物にポリオキシアルキレン基含有化合物を付加反応（変性）させたものが好ましく、その製造方法は特に制限されないが、イソシアネート化合物のイソシアネート基と、ポリオキシアルキレン基含有化合物の末端ヒドロキシル基を反応させることにより容易に製造することができる。
The (B) water-dispersible isocyanate compound (hereinafter also referred to as “component (B)”) in the aqueous coating material of the present invention is obtained by introducing a hydrophilic compound into the isocyanate compound. And those obtained by addition reaction (modification) of a polyoxyalkylene group-containing compound to an isocyanate compound, and those obtained by addition reaction (modification) of a water-soluble resin to an isocyanate compound.
In the present invention, an isocyanate compound obtained by addition reaction (modification) of a polyoxyalkylene group-containing compound is preferred, and its production method is not particularly limited, but the isocyanate group of the isocyanate compound and the terminal of the polyoxyalkylene group-containing compound are not limited. It can be easily produced by reacting a hydroxyl group.
イソシアネート化合物としては、１分子中に２以上のイソシアネート基を有するポリイソシアネート化合物が好ましく、例えば、トリレンジイソシアネート、キシリレンジイソシアネート、ジフェニルメタンジイソシアネート等の芳香族イソシアネート、
テトラメチレンジイソシアネート、ペンタメチレンジイソシアネート、ヘキサメチレンジイソシアネート、トリメチルヘキサメチレンジイソシアネート、リジンジイソシアネート等の脂肪族イソシアネート、
イソホロンジイソシアネート、水添キシリレンジイソシアネート等の脂環式イソシアネート、
等が挙げられる。かかるイソシアネート化合物としては、ビウレット構造、イソシアヌレート構造、ウレタン構造、ウレトジオン構造、アロファネート構造、三量体構造等を有するポリイソシアネート化合物を用いることもできる。
As the isocyanate compound, a polyisocyanate compound having two or more isocyanate groups in one molecule is preferable. For example, aromatic isocyanate such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate,
Aliphatic isocyanates such as tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate,
Cycloaliphatic isocyanates such as isophorone diisocyanate and hydrogenated xylylene diisocyanate,
Etc. As such an isocyanate compound, a polyisocyanate compound having a biuret structure, an isocyanurate structure, a urethane structure, a uretdione structure, an allophanate structure, a trimer structure, or the like can also be used.
ポリオキシアルキレン基含有化合物としては、例えば、ポリオキシエチレングリコール、ポリオキシエチレングリコールモノアルキルエーテル、ポリオキシエチレングリコールモノアリールエーテル、ポリオキシエチレン−プロピレングリコール、ポリオキシエチレン−プロピレングリコールモノアルキルエーテル、ポリオキシエチレン−プロピレングリコールモノアリールエーテル、ポリオキシエチレン−テトラメチレングリコール、ポリオキシエチレン−テトラメチレングリコールモノアルキルエーテル、ポリオキシエチレン−テトラメチレングリコールモノアリールエーテル等が挙げられる。 Examples of the polyoxyalkylene group-containing compound include polyoxyethylene glycol, polyoxyethylene glycol monoalkyl ether, polyoxyethylene glycol monoaryl ether, polyoxyethylene-propylene glycol, polyoxyethylene-propylene glycol monoalkyl ether, polyoxyethylene glycol Examples thereof include oxyethylene-propylene glycol monoaryl ether, polyoxyethylene-tetramethylene glycol, polyoxyethylene-tetramethylene glycol monoalkyl ether, and polyoxyethylene-tetramethylene glycol monoaryl ether.
（Ａ）成分と（Ｂ）成分の混合比率は、（Ｂ）成分中のイソシアネート基と（Ａ）成分中の水酸基の当量比率、ＮＣＯ／ＯＨ比率で好ましくは０．５〜２．０（より好ましくは０．７〜１．５）となる範囲内であればよい。 The mixing ratio of the component (A) and the component (B) is preferably 0.5 to 2.0 (from the equivalent ratio of the isocyanate group in the component (B) and the hydroxyl group in the component (A), the NCO / OH ratio. Preferably, it may be within the range of 0.7 to 1.5).
本発明水性被覆材には、上述の成分の他、本発明の効果を阻害しない範囲内で各種添加剤を配合することも可能である。このような添加剤としては、例えば、顔料、骨材、可塑剤、防腐剤、防黴剤、防藻剤、消泡剤、レベリング剤、顔料分散剤、沈降防止剤、たれ防止剤、硬化触媒、艶消し剤、紫外線吸収剤、光安定剤等が挙げられる。なお、本発明では、硬化触媒の添加は必須ではなく、硬化触媒を含まない態様も好適である。 In addition to the components described above, various additives can be blended in the aqueous coating material of the present invention within a range that does not impair the effects of the present invention. Examples of such additives include pigments, aggregates, plasticizers, antiseptics, antifungal agents, algae inhibitors, antifoaming agents, leveling agents, pigment dispersants, antisettling agents, antisagging agents, and curing catalysts. , Matting agents, ultraviolet absorbers, light stabilizers and the like. In the present invention, addition of a curing catalyst is not essential, and an embodiment not containing a curing catalyst is also suitable.
本発明の水性被覆材は、（Ａ）水酸基含有合成樹脂エマルションを含む主剤と、（Ｂ）水分散性イソシアネート化合物を含む硬化剤とからなる２液型の水性被覆材が、取扱いやすく好適である。この場合、主剤には、上記（Ａ）水酸基含有合成樹脂エマルションに加えて、顔料を含み、着色被膜を形成するものであってもよい。このような着色被膜を形成することにより、美観性を高めることができる。 As the aqueous coating material of the present invention, a two-pack type aqueous coating material comprising (A) a main agent containing a hydroxyl group-containing synthetic resin emulsion and (B) a curing agent containing a water-dispersible isocyanate compound is preferable because it is easy to handle. . In this case, the main agent may contain a pigment in addition to the above (A) hydroxyl group-containing synthetic resin emulsion to form a colored film. By forming such a colored coating, aesthetics can be enhanced.
顔料としては、例えば、酸化チタン、酸化亜鉛、カーボンブラック、酸化第二鉄（べんがら）、モリブデートオレンジ、黄色酸化鉄、群青、コバルトグリーン、鉄クロム複合酸化物、マンガンビスマス複合酸化物、マンガンイットリウム複合酸化物、マンガン鉄コバルト複合酸化物等の無機系着色顔料、アゾ系、ナフトール系、ピラゾロン系、アントラキノン系、ペリレン系、キナクリドン系、ジスアゾ系、イソインドリノン系、ベンツイミダゾール系、フタロシアニン系、キノフタロン系等の有機系着色顔料、パール顔料、蛍光顔料、蓄光顔料、メタリック顔料等の機能性顔料、重質炭酸カルシウム、沈降性炭酸カルシウム、カオリン、タルク、クレー、陶土、チャイナクレー、硫酸バリウム、炭酸バリウム、珪石粉、珪藻土等の体質顔料等が挙げられる。これらは１種または２種以上で使用することができる。 Examples of pigments include titanium oxide, zinc oxide, carbon black, ferric oxide, molybdate orange, yellow iron oxide, ultramarine, cobalt green, iron chromium composite oxide, manganese bismuth composite oxide, manganese yttrium. Inorganic color pigments such as complex oxides, manganese iron cobalt complex oxides, azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, Organic pigments such as quinophthalone, pearl pigments, fluorescent pigments, phosphorescent pigments, functional pigments such as metallic pigments, heavy calcium carbonate, precipitated calcium carbonate, kaolin, talc, clay, porcelain clay, china clay, barium sulfate, Extender pigments such as barium carbonate, silica powder, diatomaceous earth And the like. These can be used alone or in combination of two or more.
本発明の水性被覆材は、例えばコンクリート、モルタル、金属、ガラス、磁器タイル、サイディングボード、押出成形板、プラスチック等の各種素材の表面仕上げに使用することができ、主に建築物、土木構築物等に適用できる。特に、本発明の水性被覆材は、住宅、店舗、工場、倉庫等の屋内床面、あるいは屋上、一般歩道、歩道橋、プラットホーム等の屋外床面等に好ましく用いることができ、さらにはＪＩＳ Ａ６０２１に規定される屋根用塗膜防水材、外壁用塗膜防水材等の防水塗膜に対する仕上材として好ましく用いることができる。このような塗膜防水材としては、例えば、ウレタンゴム系、アクリルゴム系、クロロプレンゴム系、アクリル樹脂系、ゴムアスファルト系、又はシリコーンゴム系等が挙げられる。本発明では、特にウレタンゴム系塗膜防水材の仕上材に好適である。 The water-based coating material of the present invention can be used for surface finishing of various materials such as concrete, mortar, metal, glass, porcelain tile, siding board, extrusion molding plate, plastic, etc., mainly building, civil engineering structure etc. Applicable to. In particular, the water-based coating material of the present invention can be preferably used for indoor floors such as houses, stores, factories, and warehouses, or outdoor floors such as rooftops, general walkways, pedestrian bridges, platforms, and the like, and further to JIS A6021. It can be preferably used as a finishing material for waterproof coatings such as the waterproof coating film for roof and the waterproof coating film for outer walls. Examples of such a waterproof coating material include urethane rubber, acrylic rubber, chloroprene rubber, acrylic resin, rubber asphalt, and silicone rubber. In this invention, it is especially suitable for the finishing material of a urethane rubber-type coating film waterproofing material.
本発明における水性被覆材は、最終の仕上材として使用し、２回以上の塗り重ねによって仕上げを行うことが望ましいものである。特に、同種の水性被覆材を重ね塗りする被膜形成方法に最適である。本発明において「同種」とは、上述の水性被覆材の条件（構成）を満たすものであればよい。例えば、上述の条件（構成）を満たす（Ａ）水酸基含有合成樹脂エマルション、（Ｂ）水分散性イソシアネート化合物を含むものであればよい。（Ａ）成分、（Ｂ）成分以外の構成成分は、相違してもよいが、本発明では、各構成成分が同一のものを重ね塗りすることが好ましい。このような場合、十分な密着性を得ることができる。 The aqueous coating material in the present invention is preferably used as a final finishing material and finished by two or more coatings. In particular, it is most suitable for a film forming method in which the same kind of aqueous coating material is overcoated. In the present invention, the “same species” may be any material that satisfies the above-described conditions (configuration) of the aqueous coating material. For example, what is necessary is just to contain the (A) hydroxyl-containing synthetic resin emulsion and (B) water-dispersible isocyanate compound which satisfy | fill the above-mentioned conditions (structure). The components other than the component (A) and the component (B) may be different, but in the present invention, it is preferable to repeatedly coat the same component. In such a case, sufficient adhesion can be obtained.
同種の水性被覆材を重ね塗りする被膜形成方法としては、通常は、第１回目の塗装を行い下層被膜を形成させ、その被膜が乾燥した後に第２回目の塗装を行って上層の被膜を形成させる。ここで、下層被膜の乾燥状態は、指触乾燥、半硬化乾燥、硬化乾燥のいずれであってもよいが、本発明では、下層被膜が硬化乾燥した状態である場合に顕著な効果を得ることができる。具体的に、標準状態（２３℃、相対湿度５０％）では好ましくは１日以上（より好ましくは３日以上）の乾燥時間を設けた場合に顕著な効果が得られる。 As a method of forming a film by repeatedly applying the same type of aqueous coating material, the first coating is usually performed to form a lower layer coating, and after the coating is dried, the second coating is performed to form an upper layer coating. Let Here, the dry state of the lower layer film may be any of touch dry, semi-cured dry, and cured dry, but in the present invention, a remarkable effect is obtained when the lower layer film is cured and dried. Can do. Specifically, in a standard state (23 ° C., relative humidity 50%), a remarkable effect is obtained when a drying time of preferably 1 day or more (more preferably 3 days or more) is provided.
本発明の水性被覆材の塗付け量は、適用用途に合わせて適宜設定すればよいが、好ましくは０．１ｋｇ／ｍ２から４．０ｋｇ／ｍ２程度であればよい。また、被覆方法としては、刷毛振り、スプレー塗装、ローラー塗装等種々の方法を適宜採用することができる。 Coating with the amount of aqueous coating material of the present invention may be set as appropriate depending on the application, but preferably may be a 4.0 kg / m 2 approximately from 0.1 kg / m 2. Moreover, as a coating method, various methods, such as brush shaking, spray coating, and roller coating, can be appropriately employed.
以下に実施例を示し、本発明の特徴をより明確にする。 Examples are given below to clarify the features of the present invention.
（エマルションの製造）
表１に示すモノマー組成のエマルション（１）〜（９）を用意した（エマルション固形分５０重量％）。
(Manufacture of emulsion)
Emulsions (1) to (9) having a monomer composition shown in Table 1 were prepared (emulsion solid content: 50% by weight).
（実施例１）
エマルション（１）２００重量部に対して、水５０重量部、酸化チタン分散液７０重量部（固形分６０重量％）、添加剤［造膜助剤、分散剤、増粘剤、消泡剤、等］１０重量部を混合し主剤とした。
一方、水分散性イソシアネート［ポリオキシアルキレン変性ヘキサメチレンジイソシアネート化合物（ＮＣＯ％：１６重量％、固形分１００重量％）］２５重量部を硬化剤とした。
Example 1
Emulsion (1) For 200 parts by weight of water, 50 parts by weight of water, 70 parts by weight of titanium oxide dispersion (solid content 60% by weight), additives [film-forming aids, dispersants, thickeners, antifoaming agents, Etc.] 10 parts by weight were mixed to obtain a main agent.
On the other hand, 25 parts by weight of water-dispersible isocyanate [polyoxyalkylene-modified hexamethylene diisocyanate compound (NCO%: 16% by weight, solid content 100% by weight)] was used as a curing agent.
・試験体の作製
スレート板上にウレタン系防水塗膜が形成されたものを基材とした。
（第１回目の塗装）
上記主剤と上記硬化剤を混合して得られた水性被覆材を上記基材上に塗付け量０．１５ｋｇ／ｍ２となるように混合直後に塗付し、表２（Ｘ）に示す条件下で乾燥させた。
（第２回目の塗装）
次いで、上記主剤と硬化剤を混合して得られた水性被覆材を、表２（Ｙ）に示す条件経過後に塗付け量０．１５ｋｇ／ｍ２となるように塗付し、標準状態（温度２３℃・相対湿度５０％）で７日間乾燥させ試験体とした。
なお、表２に上記（Ｘ）と上記（Ｙ）の作製条件の組み合わせ（１〜５）を示す。この条件に従い、５種類の試験体を作製し、以下の試験を行った。結果は、表３に示す。
-Preparation of test body The base material was a urethane-based waterproof coating film formed on a slate plate.
(First painting)
The aqueous coating material obtained by mixing the main agent and the curing agent was applied on the substrate immediately after mixing so that the application amount was 0.15 kg / m 2, and the conditions shown in Table 2 (X) Dried under.
(2nd painting)
Next, the aqueous coating material obtained by mixing the main agent and the curing agent was applied so that the application amount was 0.15 kg / m 2 after the passage of the conditions shown in Table 2 (Y), and the standard state (temperature The sample was dried for 7 days at 23 ° C. and 50% relative humidity.
Table 2 shows combinations (1 to 5) of the production conditions (X) and (Y). According to these conditions, five types of test bodies were prepared and the following tests were performed. The results are shown in Table 3.
＜塗り重ね時密着性＞
作製した試験体を、ＪＩＳ Ｋ ５６００−５−６に準じた碁盤目テープ法にて密着性を評価した。評価基準は、欠損部面積が５％以内のものを「Ａ」、欠損部面積が５〜１５％のものを「Ｂ」、欠損部面積が１５〜３５％のものを「Ｃ」、欠損部面積が３５％以上のものを「Ｄ」とした。
<Adhesion during recoating>
The prepared specimens were evaluated for adhesion by a cross-cut tape method according to JIS K 5600-5-6. The evaluation criteria are “A” when the defect area is within 5%, “B” when the defect area is 5 to 15%, and “C” when the defect area is 15 to 35%. Those having an area of 35% or more were designated as “D”.
（実施例２〜７、比較例１〜２）
表１に示すエマルション（２）〜（９）を使用し、実施例１と同様の方法で、水性被覆材を作製し、実施例１と同様の方法で試験体を作製した後、同様の試験を行った。結果は、表３に示す。
(Examples 2-7, Comparative Examples 1-2)
Using the emulsions (2) to (9) shown in Table 1, an aqueous coating material was prepared in the same manner as in Example 1, and a test specimen was prepared in the same manner as in Example 1, followed by the same test. Went. The results are shown in Table 3.
Claims (2)
（Ｂ）水分散性イソシアネート化合物、
を含有する水性被覆材であって、
（Ａ）水酸基含有合成樹脂エマルションは、酸価５ｍｇＫＯＨ／ｇ以下であり、
該合成樹脂を構成する水酸基含有モノマーとして、下記（式１）で示される１級水酸基含有モノマー（ａ）を、水酸基含有モノマー中６０重量％以上含むことを特徴とする水性被覆材。
（式１）
ＣＨ２＝Ｃ−Ｒ１
│
Ｏ＝Ｃ
＼
Ｏ−Ｒ２−ＯＨ
（Ｒ１は水素またはメチル基、Ｒ２は炭素数３以上１２以下の直鎖状または分岐状アルキレン鎖。） (A) a hydroxyl group-containing synthetic resin emulsion,
(B) a water-dispersible isocyanate compound,
An aqueous coating material containing
(A) The hydroxyl group-containing synthetic resin emulsion has an acid value of 5 mgKOH / g or less,
An aqueous coating material comprising a primary hydroxyl group-containing monomer (a) represented by the following (formula 1) as a hydroxyl group-containing monomer constituting the synthetic resin in an amount of 60% by weight or more in the hydroxyl group-containing monomer.
(Formula 1)
CH 2 = C-R 1
│
O = C
\
O—R 2 —OH
(R 1 is hydrogen or a methyl group, and R 2 is a linear or branched alkylene chain having 3 to 12 carbon atoms.)
（Ａ）水酸基含有合成樹脂エマルション、
（Ｂ）水分散性イソシアネート化合物、
を含有し、
（Ａ）水酸基含有合成樹脂エマルションは、酸価５ｍｇＫＯＨ／ｇ以下であり、
該合成樹脂を構成する水酸基含有モノマーとして、下記（式１）で示される１級水酸基含有モノマー（ａ）を、水酸基含有モノマー中６０重量％以上含むことを特徴とする被膜形成方法。
（式１）
ＣＨ２＝Ｃ−Ｒ１
│
Ｏ＝Ｃ
＼
Ｏ−Ｒ２−ＯＨ
（Ｒ１は水素またはメチル基、Ｒ２は炭素数３以上１２以下の直鎖状または分岐状アルキレン鎖。） A method of forming a film by repeatedly applying the same type of aqueous coating material,
(A) a hydroxyl group-containing synthetic resin emulsion,
(B) a water-dispersible isocyanate compound,
Containing
(A) The hydroxyl group-containing synthetic resin emulsion has an acid value of 5 mgKOH / g or less,
A film-forming method comprising, as a hydroxyl group-containing monomer constituting the synthetic resin, a primary hydroxyl group-containing monomer (a) represented by the following (formula 1): 60% by weight or more in the hydroxyl group-containing monomer.
(Formula 1)
CH 2 = C-R 1
│
O = C
\
O—R 2 —OH
(R 1 is hydrogen or a methyl group, and R 2 is a linear or branched alkylene chain having 3 to 12 carbon atoms.)
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