CN116057139B - Powder coating composition - Google Patents
Powder coating composition Download PDFInfo
- Publication number
- CN116057139B CN116057139B CN202180058779.0A CN202180058779A CN116057139B CN 116057139 B CN116057139 B CN 116057139B CN 202180058779 A CN202180058779 A CN 202180058779A CN 116057139 B CN116057139 B CN 116057139B
- Authority
- CN
- China
- Prior art keywords
- carboxyl group
- polyester resin
- containing polyester
- powder coating
- coating composition
- 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.)
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- 239000008199 coating composition Substances 0.000 title claims abstract description 54
- 239000000843 powder Substances 0.000 title claims abstract description 51
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 100
- 229920001225 polyester resin Polymers 0.000 claims description 87
- 239000004645 polyester resin Substances 0.000 claims description 87
- 239000002253 acid Substances 0.000 claims description 44
- 229920000728 polyester Polymers 0.000 claims description 44
- 239000003795 chemical substances by application Substances 0.000 claims description 37
- 239000000049 pigment Substances 0.000 claims description 27
- 239000004606 Fillers/Extenders Substances 0.000 claims description 13
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 239000004593 Epoxy Substances 0.000 claims description 11
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 6
- DGUJJOYLOCXENZ-UHFFFAOYSA-N 4-[2-[4-(oxiran-2-ylmethoxy)phenyl]propan-2-yl]phenol Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C1=CC=C(O)C=C1 DGUJJOYLOCXENZ-UHFFFAOYSA-N 0.000 claims description 4
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical group OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 claims description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims 1
- 238000000576 coating method Methods 0.000 description 59
- 239000011248 coating agent Substances 0.000 description 58
- 239000000203 mixture Substances 0.000 description 18
- 230000007797 corrosion Effects 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000654 additive Substances 0.000 description 10
- 125000000524 functional group Chemical group 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 229940106691 bisphenol a Drugs 0.000 description 9
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 8
- 230000000704 physical effect Effects 0.000 description 8
- 230000007261 regionalization Effects 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 235000021168 barbecue Nutrition 0.000 description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 6
- -1 glycidyl ester Chemical class 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000006224 matting agent Substances 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 5
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010411 cooking Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004383 yellowing Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 3
- 238000009503 electrostatic coating Methods 0.000 description 3
- 239000001023 inorganic pigment Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000000379 polymerizing effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- MUTGBJKUEZFXGO-OLQVQODUSA-N (3as,7ar)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione Chemical compound C1CCC[C@@H]2C(=O)OC(=O)[C@@H]21 MUTGBJKUEZFXGO-OLQVQODUSA-N 0.000 description 2
- KMOUUZVZFBCRAM-OLQVQODUSA-N (3as,7ar)-3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C=CC[C@@H]2C(=O)OC(=O)[C@@H]21 KMOUUZVZFBCRAM-OLQVQODUSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- LCZVSXRMYJUNFX-UHFFFAOYSA-N 2-[2-(2-hydroxypropoxy)propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)CO LCZVSXRMYJUNFX-UHFFFAOYSA-N 0.000 description 2
- NKEKWLCOCURTHG-UHFFFAOYSA-N 2-ethyl-N,N'-dihydroxyhexanediamide Chemical compound ONC(C(CCCC(=O)NO)CC)=O NKEKWLCOCURTHG-UHFFFAOYSA-N 0.000 description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 description 2
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 150000001408 amides Chemical class 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
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- NEPKLUNSRVEBIX-UHFFFAOYSA-N bis(oxiran-2-ylmethyl) benzene-1,4-dicarboxylate Chemical compound C=1C=C(C(=O)OCC2OC2)C=CC=1C(=O)OCC1CO1 NEPKLUNSRVEBIX-UHFFFAOYSA-N 0.000 description 2
- BMRWNKZVCUKKSR-UHFFFAOYSA-N butane-1,2-diol Chemical compound CCC(O)CO BMRWNKZVCUKKSR-UHFFFAOYSA-N 0.000 description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 150000002513 isocyanates Chemical class 0.000 description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 2
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 2
- SRPWOOOHEPICQU-UHFFFAOYSA-N trimellitic anhydride Chemical compound OC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 SRPWOOOHEPICQU-UHFFFAOYSA-N 0.000 description 2
- YNOWBNNLZSSIHM-UHFFFAOYSA-N tris(oxiran-2-ylmethyl) benzene-1,2,4-tricarboxylate Chemical compound C=1C=C(C(=O)OCC2OC2)C(C(=O)OCC2OC2)=CC=1C(=O)OCC1CO1 YNOWBNNLZSSIHM-UHFFFAOYSA-N 0.000 description 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- QGKMIGUHVLGJBR-UHFFFAOYSA-M (4z)-1-(3-methylbutyl)-4-[[1-(3-methylbutyl)quinolin-1-ium-4-yl]methylidene]quinoline;iodide Chemical compound [I-].C12=CC=CC=C2N(CCC(C)C)C=CC1=CC1=CC=[N+](CCC(C)C)C2=CC=CC=C12 QGKMIGUHVLGJBR-UHFFFAOYSA-M 0.000 description 1
- 229940083957 1,2-butanediol Drugs 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- XBFUGGOVPHCNEG-UHFFFAOYSA-N 2-ethyl-2-(hydroxymethyl)propane-1,3-diol Chemical compound CCC(CO)(CO)CO.CCC(CO)(CO)CO XBFUGGOVPHCNEG-UHFFFAOYSA-N 0.000 description 1
- KRFFWELOYNJROH-UHFFFAOYSA-N 2-hydroxy-1,2-diphenylethanone Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1.C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 KRFFWELOYNJROH-UHFFFAOYSA-N 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 244000028419 Styrax benzoin Species 0.000 description 1
- 235000000126 Styrax benzoin Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000008411 Sumatra benzointree Nutrition 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- JRFMZTLWVBLNLM-UHFFFAOYSA-N benzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1.OC(=O)C1=CC=CC(C(O)=O)=C1 JRFMZTLWVBLNLM-UHFFFAOYSA-N 0.000 description 1
- WXBLLCUINBKULX-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1.OC(=O)C1=CC=CC=C1 WXBLLCUINBKULX-UHFFFAOYSA-N 0.000 description 1
- 229960002130 benzoin Drugs 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 150000008366 benzophenones Chemical class 0.000 description 1
- 150000001565 benzotriazoles Chemical class 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- RYERZMSSIYIZQR-UHFFFAOYSA-N butane-2,2-diol Chemical compound CCC(C)(O)O.CCC(C)(O)O RYERZMSSIYIZQR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- FCNJZMCFLNTBRZ-UHFFFAOYSA-N cyclohexane-1,4-dicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1.OC(=O)C1CCC(C(O)=O)CC1 FCNJZMCFLNTBRZ-UHFFFAOYSA-N 0.000 description 1
- GJBRTCPWCKRSTQ-UHFFFAOYSA-N decanedioic acid Chemical compound OC(=O)CCCCCCCCC(O)=O.OC(=O)CCCCCCCCC(O)=O GJBRTCPWCKRSTQ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 235000019382 gum benzoic Nutrition 0.000 description 1
- HJJLDNAELNDBBL-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO.OCCCCCCO HJJLDNAELNDBBL-UHFFFAOYSA-N 0.000 description 1
- YVSCCMNRWFOKDU-UHFFFAOYSA-N hexanedioic acid Chemical compound OC(=O)CCCCC(O)=O.OC(=O)CCCCC(O)=O YVSCCMNRWFOKDU-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJTGANWAUPEOAX-UHFFFAOYSA-N molport-023-220-454 Chemical compound OCC(O)CO.OCC(O)CO NJTGANWAUPEOAX-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000012860 organic pigment Substances 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
- 229920001485 poly(butyl acrylate) polymer Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000120 polyethyl acrylate Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- ZWPWUVNMFVVHHE-UHFFFAOYSA-N terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1.OC(=O)C1=CC=C(C(O)=O)C=C1 ZWPWUVNMFVVHHE-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- C09D5/03—Powdery paints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention relates to a powder coating composition which realizes a clear structural pattern and is excellent in pinhole resistance and heat resistance.
Description
Technical Field
The present invention relates to a powder coating composition which realizes a clear structural pattern and is excellent in pinhole resistance and heat resistance.
Background
Metals such as aluminum, titanium, and copper are used as main raw materials for buildings, automobiles, industrial appliances, and the like, and the surfaces of the metals are coated with a coating composition to protect the metals from the severe external environment. The coating composition is required to have various physical properties such as heat resistance, corrosion resistance, weather resistance, acid resistance, alkali resistance, gloss, and adhesion, and particularly in the case of being applied to various industrial appliances (for example, cooking appliances such as outdoor barbecue grills (Barbecue grill)) which are repeatedly exposed to high temperature for a long period of time, it is important to ensure excellent heat resistance, corrosion resistance, and excessive film pinhole stability and to ensure physical properties capable of realizing a stable structural pattern in particular.
For these reasons, various studies have been made on coating compositions excellent in heat resistance, and as an example, patent publication No. 10-2014-0003283 discloses a powder coating composition comprising a polyester resin having a specific acid value range as a main component and at least one of isocyanurates, glycidyl esters, and isocyanates as a curing agent. However, the powder coating material exhibits excessive film pinholes and heat resistance degradation at high temperatures, and thus does not exhibit sufficient physical properties for use as a coating material for cooking appliances requiring high heat resistance.
On the other hand, patent No. 10-2047889 discloses a heat-resistant powder coating material using aluminosilicate as a heat-conductive filler, which is suitable for firing treatment in order to realize heat resistance. However, workability and appearance become poor when aluminosilicate is applied and there is a disadvantage that it is insufficient to show physical properties for use as a pattern coating.
Disclosure of Invention
(Problem to be solved by the invention)
The present invention provides a powder coating composition which realizes a clear structural pattern and is excellent in pinhole resistance and heat resistance.
(Measures taken to solve the problems)
The present invention provides a powder coating composition comprising 3 or more carboxyl group-containing polyester resins having different acid numbers from each other, a polyester curing agent, and a bisphenol A type glycidyl ether type epoxy resin.
(Effects of the invention)
The present invention provides a powder coating composition which realizes a clear structural pattern and is excellent in pinhole resistance and heat resistance. In particular, the powder coating composition according to the present invention is suitable for various industrial appliances (for example, cooking appliances such as outdoor barbecue grill (Barbecue grill)) that are repeatedly exposed to high temperature for a long period of time because it is excellent in heat resistance, corrosion resistance, and excessive film pinhole stability and can specifically realize a stable structural pattern.
Detailed Description
The present invention will be described below. However, the present invention is not limited to the following, and each component may be variously modified or selectively mixed and used as necessary. Thus, it should be understood to cover all modifications, equivalents, or alternatives falling within the spirit and technical scope of the present invention.
As used herein, "viscosity" is determined by conventional methods known in the art, and may be determined, for example, using a Brookfield viscometer (brookfield viscometer). The "weight average molecular weight" is determined by a usual method known in the art, and for example, it can be determined by a GPC (gel permeation chromatograph, gel permeation chromatography) method. In addition, the value of the functional group such as "acid value" is determined by a usual method known in the art, and for example, it can be determined by a titration (titration) method.
The powder coating composition according to the present invention comprises 3 or more carboxyl group-containing polyester resins having mutually different acid numbers, a polyester curing agent, and a bisphenol a type glycidyl ether type epoxy resin. The powder coating composition of the present invention may further contain additives commonly used in the field of powder coatings, if necessary.
Carboxyl group-containing polyester resin
The powder coating composition according to the present invention comprises a carboxyl group-containing polyester resin as a main resin. The carboxyl group-containing polyester resin plays a role in ensuring weather resistance and mechanical properties when applied to coating.
The carboxyl group-containing polyester resin may be a carboxyl group-containing polyester resin having a carboxyl group at the terminal of a polymer resin. The carboxyl group-containing polyester resin has a crosslinked structure incorporated therein, and can be produced by polymerizing 1 or more of a monomer and a polymer having a hydroxyl group as a terminal functional group and 1 or more of a monomer and a polymer having a carboxyl group as a terminal functional group in the presence of a catalyst.
The monomer having a hydroxyl group as a terminal functional group may contain a polyfunctional alcohol, and the polyfunctional alcohol may be an alcohol having 2 or more functions, for example, may be an alcohol having 2 to 4 functions. The type of the polyfunctional alcohol is not particularly limited, and for example, 1 selected from the group consisting of Ethylene glycol (Ethylene glycol), diethylene glycol (DIETHYLENE GLYCOL), triethylene glycol (TRIETHYLENE GLYCOL), propylene glycol (Propylene glycol), trimethylolpropane (Trimethylol propane), methylpropanediol (Methyl Propanediol), pentaethylene glycol (PENTAETHYLENE GLYCOL), tripropylene glycol (Tripropylene Glycol), cyclohexanedimethanol (Cyclohexanedimethanol), 1, 2-butanediol (1, 2-Butylene glycol), neopentyl glycol (Neopentyl glycol), 1,6-hexanediol (1, 6-Hexanediol) and glycerin (Glycerol) or a mixture thereof may be used.
The above polymer having a hydroxyl group as a terminal functional group can be produced by polymerizing the above monomer having a hydroxyl group as a terminal functional group. The kind of the above polymer having a hydroxyl group as a terminal functional group is not particularly limited, and for example, 1 selected from the group consisting of polyethylene glycol (Polyethylene glycol) and polypropylene glycol (polypropylene glycol) or a mixture thereof may be used.
The monomer having a carboxyl group as a terminal functional group may contain a polyfunctional acid, and the polyfunctional acid may be an acid having 2 or more functions, for example, may be an acid having 2 to 4 functions. The type of the above-mentioned polyfunctional acid is not particularly limited, and for example, 1 selected from the group consisting of terephthalic acid (TEREPHTHALIC ACID), isophthalic acid (Isophthalic acid), 1, 4-cyclohexanedicarboxylic acid (1, 4-Cyclohexane dicarboxylic acid), adipic acid (ADIPIC ACID), sebacic acid (Sebacic acid), phthalic anhydride (PHTHALIC ANHYDRIDE), trimellitic anhydride (TRIMELLITIC ANHYDRIDE), benzoic acid (Benzoic acid), tetrahydrophthalic anhydride (Tetrahydrophthalic anhydride) and hexahydrophthalic anhydride (hexahydrophthalic anhydride) or a mixture thereof can be used.
The above polymer having a carboxyl group as a terminal functional group can be prepared by polymerizing the above monomer having a carboxyl group as a terminal functional group.
In the present invention, the carboxyl group-containing polyester resin contains 3 or more carboxyl group-containing polyester resins having different acid numbers from each other. The use of 3 or more carboxyl group-containing polyester resins having different acid numbers in combination results in a difference in curing speed, and thus can improve pattern formability. When only 1 kind of carboxyl group-containing polyester resin is used or 2 kinds of carboxyl group-containing polyester resins having different acid numbers are used, it is difficult to form a pattern, or heat resistance, pinhole resistance, corrosion resistance, etc. are lowered.
In the present invention, the carboxyl group-containing polyester resin includes a first carboxyl group-containing polyester resin excellent in heat resistance, a second carboxyl group-containing polyester resin excellent in pinhole resistance, and a third carboxyl group-containing polyester resin excellent in mechanical properties, corrosion resistance, and structural pattern formability.
The acid value of the above-mentioned first carboxyl group-containing polyester resin may be 28 to 36mgKOH/g. When the acid value of the first carboxyl group-containing polyester resin satisfies the above range, excellent heat resistance and adhesion can be ensured. When the acid value of the first carboxyl group-containing polyester resin is smaller than the above range, heat resistance and adhesion may be lowered, and when the acid value exceeds the above range, impact resistance, scratch resistance and structural pattern formation may be lowered.
The viscosity at 165℃of the above-mentioned first carboxyl group-containing polyester resin may be 800 to 1,000 Poise (Poise). When the viscosity of the first carboxyl group-containing polyester resin satisfies the above range, excellent paint workability and structural pattern formability can be ensured. When the viscosity of the first carboxyl group-containing polyester resin is less than the above range, electrostatic coating is not smoothly performed at the time of coating work, so that the coating film is unevenly coated, and flow (Sagging) defects occur at the time of curing after coating. On the other hand, when the viscosity exceeds the above range, the structural pattern formability may be lowered.
The weight average molecular weight of the first carboxyl group-containing polyester resin may be 6,000 to 12,000g/mol. When the weight average molecular weight of the first carboxyl group-containing polyester resin satisfies the above range, a coating film is smoothly formed, and excellent smoothness can be ensured. When the weight average molecular weight of the first carboxyl group-containing polyester resin is less than the above range, the coating film is formed thin even when the same amount is applied, and the appearance is reduced, and when the weight average molecular weight exceeds the above range, the coating film is excessively formed, and pinhole resistance and pattern formation are reduced.
The acid value of the above-mentioned second carboxyl group-containing polyester resin may be 15 to 21mgKOH/g. When the acid value of the second carboxyl group-containing polyester resin satisfies the above range, excellent heat resistance, in particular, excellent high-temperature yellowing can be ensured. When the acid value of the second carboxyl group-containing polyester resin is smaller than the above range, heat resistance, particularly high-temperature yellowing property, is lowered, and when the acid value exceeds the above range, structural pattern formation property is lowered.
The viscosity of the second carboxyl group-containing polyester resin at 200℃may be 60 to 85 poise. When the viscosity of the second carboxyl group-containing polyester resin satisfies the above range, excellent structural pattern formability can be ensured. When the viscosity of the second carboxyl group-containing polyester resin falls outside the above range, electrostatic coating is not smoothly performed during the coating operation, and the coating film may be unevenly coated, with the result that the structural pattern formation may be lowered.
In addition, the weight average molecular weight of the above second carboxyl group-containing polyester resin may be 5,000 to 10,000g/mol. When the weight average molecular weight of the second carboxyl group-containing polyester resin satisfies the above range, the coating film is smoothly formed, and excellent hardness can be ensured. When the weight average molecular weight of the second carboxyl group-containing polyester resin is less than the above range, the coating film is formed thin, and the appearance is reduced, and when the weight average molecular weight exceeds the above range, the coating film is excessively formed, and the pinhole resistance and pattern formation are reduced.
The acid value of the above-mentioned third carboxyl group-containing polyester resin may be 68 to 76mgKOH/g. When the acid value of the third carboxyl group-containing polyester resin satisfies the above range, the curing speed is faster than that of the first carboxyl group-containing polyester resin and the second carboxyl group-containing polyester resin, the pattern is formed well, and excellent corrosion resistance of the coating film can be ensured. When the acid value of the third carboxyl group-containing polyester resin is smaller than the above range, corrosion resistance and adhesion may be lowered, and when the acid value exceeds the above range, crosslinking of the coating film proceeds excessively, and hardness and impact resistance may be lowered.
The viscosity of the third carboxyl group-containing polyester resin at 200℃may be 20 to 50 poise. When the viscosity of the third carboxyl group-containing polyester resin satisfies the above range, the coating is smoothly performed, and excellent corrosion resistance can be ensured. When the viscosity of the third carboxyl group-containing polyester resin falls outside the above range, electrostatic coating is not smoothly performed at the time of coating work, and coating film coating becomes uneven, and as a result, structural pattern formability is lowered.
The weight average molecular weight of the above-mentioned third carboxyl group-containing polyester resin may be 6,000 to 8,000g/mol. When the weight average molecular weight of the third carboxyl group-containing polyester resin satisfies the above range, a coating film can be smoothly formed and a structural pattern can be formed. When the weight average molecular weight of the third carboxyl group-containing polyester resin is less than the above range, the coating film is formed thin, and the adhesion is lowered, and when the weight average molecular weight exceeds the above range, the coating film is excessively formed, and the pinhole resistance and the pattern formation are lowered.
The carboxyl group-containing polyester resins described above may be contained in an amount of 55 to 65% by weight, based on the total weight of the powder coating composition.
The first carboxyl group-containing polyester resin may be contained in an amount of 5 to 30% by weight, for example, 10 to 20% by weight, based on the total weight of the powder coating composition. When the content of the first carboxyl group-containing polyester resin satisfies the above range, excellent heat resistance, adhesion and pattern formability can be ensured. When the content of the first carboxyl group-containing polyester resin is less than the above range, heat resistance and adhesion may be reduced, and when it exceeds the above range, pattern formability may be reduced.
The second carboxyl group-containing polyester resin may be contained in an amount of 5 to 40% by weight, for example, 20 to 30% by weight, based on the total weight of the powder coating composition. When the content of the second carboxyl group-containing polyester resin satisfies the above range, excellent heat resistance, in particular, excellent high-temperature yellowing can be ensured. When the content of the second carboxyl group-containing polyester resin is less than the above range, heat resistance is lowered, and particularly high-temperature yellowing property is lowered, and when it exceeds the above range, structural pattern formability is lowered.
The above-described third carboxyl group-containing polyester resin may be contained in an amount of 5 to 35% by weight, for example, 15 to 25% by weight, based on the total weight of the powder coating composition. When the content of the third carboxyl group-containing polyester resin satisfies the above range, excellent pattern formability and corrosion resistance can be ensured. When the content of the third carboxyl group-containing polyester resin is less than the above range, the pattern formability and the corrosion resistance are deteriorated, and when the content exceeds the above range, the hardness of the coating film is lowered.
As an example, the weight ratio of the first carboxyl group-containing polyester resin to the second carboxyl group-containing polyester resin may be 1:0.5 to 3.5, for example, may be 1:1 to 3. When the weight ratio of the first carboxyl group-containing polyester resin to the second carboxyl group-containing polyester resin falls outside the above range, heat resistance and structural pattern formability may be lowered.
As an example, the weight ratio of the first carboxyl group-containing polyester resin to the third carboxyl group-containing polyester resin may be 1:0.3 to 3.5, for example, may be 1:0.5 to 2.5. In the case where the weight ratio of the first carboxyl group-containing polyester resin and the third carboxyl group-containing polyester resin is out of the above range, the pattern formability, the corrosion resistance, and the hardness may be lowered.
Curing agent
The powder coating composition according to the present invention comprises a polyester curing agent and a bisphenol a type glycidyl ether type epoxy resin as curing agents. The curing speed of the coating film is adjusted by mixing 2 curing agents having different structures and epoxy equivalent weights, so that excellent pattern formation, salt spray resistance and smoothness can be ensured.
As the above polyester curing agent, a polyester curing agent having an epoxy equivalent of 100 to 120g/eq can be used. When the equivalent weight of the polyester curing agent is less than the above-mentioned range, dispersibility and salt spray resistance are lowered, and when the equivalent weight exceeds the above-mentioned range, curability is lowered.
As non-limiting examples of the above polyester curing agents, there are: isocyanurate-based curing agents such as triglycidyl isocyanurate (TRIGLYCIDYL ISOCYANURATE (TGIC)); glycidyl ester curing agents such as diglycidyl terephthalate (DIGLYCIDYLTEREPHTHALATE (DGT)) and triglycidyl trimellitate (TRIGLYCIDYLTRIMELLITATE (TML)); alkylamide-based curing agents such as Bis (N, N '-dihydroxyethyl) -adipamide (Bis (N, N' -dihydroxyethyl) -ADIPAMIDE); isocyanate curing agents such as epsilon-caprolactam blocked isophorone diisocyanate (epsilon-Caprolactam blocked Isophorone Diisocyanate) or mixtures thereof, and the like.
The polyester curing agent may be contained in an amount of 1 to 10% by weight, for example, 4 to 6% by weight, based on the total weight of the powder coating composition. In the case where the content of the above-mentioned polyester curing agent is less than the above-mentioned range, curing is impossible, resulting in difficulty in formation of a coating film, and in the case where it exceeds the above-mentioned range, the coating film is liable to be broken.
The bisphenol a type glycidyl ether type epoxy resin is used as an auxiliary curing agent, and when used in combination, it can ensure not only excellent smoothness and interlayer adhesion to a liquid intermediate coating layer, but also excellent corrosion resistance.
As the bisphenol a type glycidyl ether type epoxy resin, the bisphenol a type glycidyl ether type epoxy resin having an epoxy equivalent of 700 to 900g/eq may be used, and for example, the bisphenol a type glycidyl ether type epoxy resin having an epoxy equivalent of 780 to 840g/eq may be used. In the case where the epoxy equivalent is less than the aforementioned range, the bendability becomes poor due to the decrease in viscosity and the storability of the paint may be lowered. In contrast, in the case where the epoxy equivalent exceeds the aforementioned range, the viscosity of the coating material increases due to the increase in the viscosity of the resin, resulting in a decrease in wettability and impact resistance, and thus the adhesion may decrease.
The bisphenol a type glycidyl ether type epoxy resin may be contained in an amount of 1 to 10% by weight, for example, 2 to 4% by weight, based on the total weight of the powder coating composition. In the case where the content of the above bisphenol a type epoxy resin is less than the above-mentioned range, interlayer adhesion with the liquid intermediate coating layer may be reduced, and smoothness and corrosion resistance may be reduced. On the other hand, when the glass transition temperature of the coating film exceeds the above-mentioned range, the glass transition temperature of the coating film decreases.
Additive agent
The powder coating composition of the present invention can optionally further contain additives commonly used in the powder coating field within a range that does not impair the inherent characteristics of the above composition. As non-limiting examples of the additive that can be used in the present invention, there are leveling agents, matting agents, pinhole preventing agents, ultraviolet absorbers, etc., which can be used alone or in combination of 2 or more.
Leveling agents level the coating composition so that it is applied flat and smooth to enhance the appearance characteristics of the coating film while increasing the adhesion in the composition. The leveling agent may be 1 or more kinds selected from acrylic, silicon, polyester and amine leveling agents, and may be, for example, an acrylic leveling agent. Non-limiting examples of the acrylic leveling agent include polyacrylate polymers, polymethacrylate polymers, polyethyl acrylate, polybutyl acrylate, and poly-2-ethylhexyl acrylate.
The matting agent plays a role of disappearing or reducing the gloss of the coating film. As non-limiting examples of the matting agent, there are polyolefin wax, mercaptobenzothiazole, acrylic acid copolymer resin, etc., which may be used alone or in combination of 2 or more. When the matting agent is used in combination of 2 or more kinds, excellent gloss can be achieved. For example, the matting agent may be a mixture of polyethylene wax and acrylic acid or a mixture of mercaptobenzothiazole and acrylic acid. The mercaptobenzothiazole may be a mercaptobenzothiazole containing a metal salt.
The pinhole inhibitor can prevent pinholes in the coating film and improve appearance characteristics by releasing volatile substances from the coating film when the curing step is performed. Non-limiting examples of the pinhole inhibitor include amides (for example ceraflour,960, byk (pick chemical) corporation), polypropylenes, stearic acid pinhole inhibitors, and the like. As an example, the pinhole inhibitor may be benzoin (benzoin) or a mixture of benzoin and an amide pinhole inhibitor.
The ultraviolet absorber can improve external durability after coating. Non-limiting examples of the ultraviolet absorber include benzotriazoles, benzylhydantoins (benzylidenehydant), benzophenones, benzoguanamines (benzoguanine), etc., which may be used alone or in combination of 2 or more kinds.
The above additives may be appropriately added in a content range well known in the art, and for example, the above additives may each be used in an amount of 0.01 to 10% by weight relative to the total weight of the powder coating composition.
Pigment
The powder coating composition of the present invention may optionally further contain a pigment generally used in the coating field, for example, an extender pigment, a color pigment or a mixture thereof, within a range not impairing the inherent characteristics of the above composition.
The extender pigment plays a role of filling the pores in the coating film and compensating for the formation of the coating film and imparting thickening property or mechanical property to the coating film. Therefore, when the extender pigment is contained, a good appearance of the coating film can be obtained, and hardness, impact resistance, rust resistance, and the like can be improved.
As the extender pigment, extender pigments commonly used in coating compositions can be used without limitation, and as non-limiting examples, barium sulfate, calcium carbonate, clay, talc, magnesium silicate, kaolin, mica, silica, aluminum silicate, aluminum hydroxide, and the like can be used. The aforementioned components may be used singly or in combination of two or more.
As an example, the extender pigment having a particle size of 10 μm or more, for example, 10 to 25 μm, and as another example, an extender pigment having a particle size of 15 to 25 μm may be used. In the case where the particle size of the above extender pigment is smaller than the above-described range, the matting effect and pinhole hiding power may be reduced, and in the case where it exceeds the above-described range, smoothness may be reduced or excessive flaws may be generated in the coating film or coating efficiency may be reduced.
The above extender pigment may be contained in an amount of 15 to 45% by weight, for example, 25 to 35% by weight, relative to the total weight of the powder coating composition. When the content of the extender pigment is within the above-described range, the mechanical properties, impact resistance, adhesion and the like of the coating film can be improved.
Colored pigments can be used in order to make the paint appear a desired color or to increase the strength or gloss of the coating film. As such a colored pigment, an organic pigment, an inorganic pigment, a metallic pigment, an aluminum paste (Al-paste), a pearlescent (pearl) pigment, or the like which is generally used in a paint can be used without limitation, and they can be used alone or in combination of 2 or more. Examples of the color pigments that can be used include azo-based, phthalocyanine-based, iron oxide-based, cobalt-based, carbonate-based, sulfate-based, silicate-based, chromate-based pigments, and the like, and examples thereof include titanium dioxide, zinc oxide, bismuth vanadate, azure green, carbon black, iron oxide red, iron oxide yellow, navy blue, cyanine blue, and mixtures of 2 or more thereof. The inorganic pigments such as titanium dioxide and zinc oxide described above can be colored white when used alone. As another example, the above-described inorganic pigments may also be used in combination with other colored pigments to adjust to a particular color.
The above colored pigment may be contained in an amount of 0.1 to 10% by weight, for example, 0.1 to 5% by weight, relative to the total weight of the powder coating composition. When the content of the colored pigment is within the above-described range, the color of the coating film is excellent and the mechanical properties, impact resistance, and the like of the coating film can be improved.
The powder coating composition according to the present invention can be prepared by methods known in the art, and as an example, can be prepared by the procedures of raw material weighing, dry premixing, dispersing and coarse grinding, pulverizing and classifying. For example, a powder coating composition can be prepared by placing a raw material mixture containing a carboxyl group-containing polyester resin, a curing agent, a matting agent, a pigment and other additives into a container mixer to be uniformly mixed, and melt-mixing the above-mentioned mixed composition and pulverizing it. As an example, the above-mentioned raw material mixture may be melt-dispersed at 70 to 130 ℃ by a melt-kneading apparatus such as a kneader (kneader) or an extruder (extruder) to prepare chips of a prescribed thickness (for example, 1 to 5 mm), and then the prepared chips may be pulverized to a range of 40 to 80 μm by a pulverizing apparatus such as a high-speed mixer, followed by classification to prepare a powder coating composition.
The classification step is not particularly limited, and may be performed, for example, by 80 to 200 mesh (mesh). Thus, a powder coating having an average particle size in the range of 20 to 80 μm can be obtained. Although the average particle diameter of the powder is not particularly limited, when the aforementioned range is satisfied, the coating workability and the appearance characteristics of the coating film can be enhanced.
In order to improve the flowability of the powder coating, the surface of the powder coating particles according to the invention may also be coated with a fine powder of a polyethylene-based wax or fumed silica or the like. As a method for performing such a treatment, a pulverization mixing method in which fine powder is added and mixed at the time of pulverization, a dry mixing method using a Henschel Mixer (Henschel Mixer), or the like can be used.
Modes for carrying out the invention
The present invention will be described in more detail with reference to examples. However, the following examples are merely for aiding in understanding the present invention, and the scope of the present invention is not limited in any way to the examples.
Examples 1 to 16
Chips (chips) were prepared by premixing the components in a mixing tank according to the compositions shown in tables 1 to 2 below, and then melt-dispersing the components in a dispersing machine at 100 ℃. The prepared chips were pulverized with a high-speed mixer to prepare powder coating compositions of each example having an average particle size of 25 to 55 μm.
Comparative examples 1 to 14
Powder coating compositions of respective comparative examples were prepared in the same manner as in examples, except for the compositions according to the following tables 3 to 4.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
Polyester 1-1: carboxyl polyester (acid value 32mgKOH/g, viscosity 912 poise (165 ℃ C.), mw 9,050 g/mol)
Polyester 1-2: carboxyl polyester (acid value 28mgKOH/g, viscosity 804 poise (165 ℃ C.), mw 6,280 g/mol)
1-3 Of polyester: carboxyl polyester (acid value 36mgKOH/g, viscosity 992 poise (165 ℃ C.), mw 11,400 g/mol)
Polyesters 1 to 4: carboxyl polyester (acid value 26mgKOH/g, viscosity 881 poise (165 ℃ C.), mw 9,600 g/mol)
1-5 Of polyester: carboxyl polyester (acid value 38mgKOH/g, viscosity 897 poise (165 ℃ C.), mw 9,300 g/mol)
Polyester 2-1: carboxyl polyester (acid value 18mgKOH/g, viscosity 70 poise (200 ℃ C.), mw 7,560 g/mol)
Polyester 2-2: carboxyl polyester (acid value of 15mgKOH/g, viscosity of 60.5 poise (200 ℃ C.), mw of 5,210 g/mol)
Polyester 2-3: carboxyl polyester (acid value 21mgKOH/g, viscosity 84.2 poise (200 ℃ C.), mw 9,720 g/mol)
Polyester 2-4: carboxyl polyester (acid value 13mgKOH/g, viscosity 71 poise (200 ℃ C.), mw 7,200 g/mol)
Polyester 2-5: carboxyl polyester (acid value 23mgKOH/g, viscosity 73 poise (200 ℃ C.), mw 7,070 g/mol)
Polyester 3-1: carboxyl polyester (acid value 72mgKOH/g, viscosity 33 poise (200 ℃ C.), mw 7,300 g/mol)
Polyester 3-2: carboxyl polyester (acid value 68mgKOH/g, viscosity 21 poise (200 ℃ C.), mw 6,020g/mol)
Polyester 3-3: carboxyl polyester (acid value 76mgKOH/g, viscosity 47 poise (200 ℃ C.), mw 7,910 g/mol)
3-4 Of polyester: carboxyl polyester (acid value 66mgKOH/g, viscosity 37 poise (200 ℃ C.), mw 7,500 g/mol)
3-5 Of polyester: carboxyl polyester (acid value 78mgKOH/g, viscosity 36 poise (200 ℃ C.), mw 7,260 g/mol)
Curing agent 1-1: triglycidyl isocyanurate (epoxy equivalent 110g/eq, CIBA (Ciba refining Co.))
Curing agent 2-1: bisphenol-A glycidyl ether (780 g/eq epoxide equivalent)
Curing agent 2-2: bisphenol-A glycidyl ether (epoxy equivalent: 810 g/eq)
2-3 Parts of curing agent: bisphenol-A glycidyl ether (epoxy equivalent 840 g/eq)
Additive 1: polyethylene wax (Lubrizol (Lu Borun Co.))
Additive 2: acrylic copolymer (DSM (Dissman Co.))
Additive 3: alumina (Evonik (winning industry group))
Black pigment: carbon black (Columbian (Columbia chemical Co.))
Extender pigment 1: calcium carbonate (particle size: 15-18 μm)
Extender pigment 2: calcium carbonate (particle size: 4-6 μm)
Experimental example-evaluation of physical Properties
The physical properties of the powder coating compositions prepared in the respective examples and comparative examples were measured in the following manner, and the results thereof are shown in tables 5 to 8 below.
Test piece manufacture
Powder coating compositions according to examples and comparative examples were respectively electrostatically sprayed on aluminum (chromate treated) of 75mm×150mm×0.4mm size, followed by curing to produce test pieces having a dried coating film thickness of 70 μm.
Appearance (Pattern)
The apparent state of each test piece was visually observed to evaluate the sharpness of the pattern (structure).
[ Criterion ]
And (3) the following materials: forming a very clear pattern, o: forming a clear pattern, delta: form bad pattern, x: unpatterned
Adhesion property
According to ISO 2409, 10 lattices were prepared at 1mm intervals for each test piece, and tape peeling test was performed.
Impact resistance
A drop hammer of 500g was dropped from a height of 50cm onto each test piece using a Dupont impact tester (Dupont IMPACT TESTER), after which it was confirmed whether or not the coating film had cracks (cracks).
Salt spray resistance
Each test piece was subjected to a salt spray resistance test for 1,000 hours, after which the one-side peeling width was measured. The smaller the peeling width, the better.
Pinhole generation film thickness
After powder coating compositions according to examples and comparative examples were respectively electrostatically sprayed on aluminum (chromate treated) of 75mm×150mm×0.4mm size, pinhole generation limit film thickness was measured under an overcuring condition (220 ℃). The thicker the coating film thickness, the better.
Heat resistant cycle
After each test piece was subjected to a heat cycle test (the process of reaching normal temperature (23 ℃) after curing at 280℃for 1 hour was repeatedly performed 10 times), the color difference and adhesion (ISO 2409) of the coating film were evaluated.
TABLE 5
TABLE 6
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TABLE 7
TABLE 8
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From the results of the above tables 5 to 6, it was confirmed that, in the case where the coating compositions according to examples 1 to 16 of the present invention were applied, the appearance (pattern), adhesion, impact resistance, salt spray resistance, pinhole resistance, and heat resistance were all shown to be excellent. In contrast, from the results of tables 7 to 8 described above, it was confirmed that the measured items showed inferior physical properties as a whole in the case where the coating compositions of comparative examples 1 to 14 from which the compositions according to the present invention were peeled off were applied, as compared with the coating materials of examples.
Specifically, in the case where the coating composition of comparative example 1 not containing the first polyester resin according to the present application was applied, adhesion and heat resistance were shown to be poor, in the case where the coating composition of comparative example 2 not containing the second polyester resin according to the present application was applied, salt spray resistance and pinhole resistance were shown to be poor, and in the case where the coating composition of comparative example 3 not containing the third polyester resin according to the present application was applied, appearance (pattern) and heat resistance were shown to be poor.
In the case where the coating compositions of comparative examples 4 to 5 using only 1 of the curing agents according to the present application were applied, the salt spray resistance and impact resistance were shown to be poor.
Although 3 kinds of polyester resins were applied, in the case of applying the coating compositions of comparative examples 6 to 11 using the polyester resins from which the acid value range according to the present application was removed, adhesion, impact resistance, heat resistance, appearance (pattern formation property) and the like were shown to be inferior. In addition, in the case where the coating compositions of comparative examples 12 to 14 using only 1 of the polyester resins according to the present application were applied, the measured physical properties were all shown to be poor.
(Industrial applicability)
The present invention provides a powder coating composition which realizes a clear structural pattern and is excellent in pinhole resistance and heat resistance. In particular, the powder coating composition according to the present invention is suitable for various industrial appliances (for example, cooking appliances such as outdoor barbecue grill (Barbecue grill)) that are repeatedly exposed to high temperature for a long period of time because it is excellent in heat resistance, corrosion resistance, and excessive film pinhole stability and can specifically realize a stable structural pattern.
Claims (6)
1. A powder coating composition, wherein,
Comprises more than 3 carboxyl group-containing polyester resins, a polyester curing agent and bisphenol A type glycidyl ether type epoxy resins,
The above carboxyl group-containing polyester resin comprises a first carboxyl group-containing polyester resin having an acid value of 28 to 36mgKOH/g, a second carboxyl group-containing polyester resin having an acid value of 15 to 21mgKOH/g, a third carboxyl group-containing polyester resin having an acid value of 68 to 76mgKOH/g,
The first carboxyl group-containing polyester resin has a viscosity of 800 to 1,000 poise at 165 ℃ and a weight average molecular weight of 6,000 to 12,000g/mol,
The second carboxyl group-containing polyester resin has a viscosity of 60 to 85 poise at 200 ℃ and a weight average molecular weight of 5,000 to 10,000g/mol,
The above-mentioned third carboxyl group-containing polyester resin has a viscosity of 20 to 50 poise at 200℃and a weight average molecular weight of 6,000 to 8,000g/mol,
The polyester curing agent is an isocyanurate curing agent.
2. The powder coating composition of claim 1, wherein,
The weight ratio of the first carboxyl group-containing polyester resin to the second carboxyl group-containing polyester resin is 1:0.5 to 3.5, and the weight ratio of the first carboxyl group-containing polyester resin to the third carboxyl group-containing polyester resin is 1:0.3 to 3.5.
3. The powder coating composition of claim 1, wherein,
The epoxy equivalent of the polyester curing agent is 100 to 120g/eq.
4. The powder coating composition of claim 1, wherein,
The epoxy equivalent of the bisphenol A type glycidyl ether type epoxy resin is 700 to 900g/eq.
5. The powder coating composition of claim 1, wherein,
Further comprising an extender pigment having a particle size of from 10 to 25 μm.
6. The powder coating composition of claim 1, wherein,
Comprising 5 to 30 wt.% of the above first carboxyl group-containing polyester resin, 5 to 40 wt.% of the above second carboxyl group-containing polyester resin, 5 to 35 wt.% of the above third carboxyl group-containing polyester resin, 1 to 10 wt.% of the above polyester curing agent, and 1 to 10 wt.% of the above bisphenol a glycidyl ether type epoxy resin, based on the total weight of the powder coating composition.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020200188519A KR102524077B1 (en) | 2020-12-30 | 2020-12-30 | Powder coating composition |
| KR10-2020-0188519 | 2020-12-30 | ||
| PCT/KR2021/012688 WO2022145628A1 (en) | 2020-12-30 | 2021-09-16 | Powder coating composition |
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| CN116057139A CN116057139A (en) | 2023-05-02 |
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| KR (1) | KR102524077B1 (en) |
| CN (1) | CN116057139B (en) |
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| CA2131745A1 (en) * | 1994-09-09 | 1996-03-10 | Takafumi Umehara | Low Gloss Powder Coating Composition and Method for Coating Therewith |
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| EP2199314A1 (en) * | 2008-12-19 | 2010-06-23 | Hexion Specialty Chemicals Research Belgium S.A. | Powder coating compositions for low temperature curing and high flow |
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| KR102042203B1 (en) * | 2017-11-10 | 2019-11-07 | 주식회사 케이씨씨 | Powder coating composition |
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2020
- 2020-12-30 KR KR1020200188519A patent/KR102524077B1/en active IP Right Grant
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2021
- 2021-09-16 WO PCT/KR2021/012688 patent/WO2022145628A1/en active Application Filing
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| CA2131745A1 (en) * | 1994-09-09 | 1996-03-10 | Takafumi Umehara | Low Gloss Powder Coating Composition and Method for Coating Therewith |
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| JP2004018547A (en) * | 2002-06-12 | 2004-01-22 | Japan U-Pica Co Ltd | Powder coating resin composition |
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| CN116057139A (en) | 2023-05-02 |
| WO2022145628A1 (en) | 2022-07-07 |
| MX2023002149A (en) | 2023-03-01 |
| KR20220096251A (en) | 2022-07-07 |
| KR102524077B1 (en) | 2023-04-20 |
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