CN114163920A - Water-based automobile primer and preparation method thereof - Google Patents
Water-based automobile primer and preparation method thereof Download PDFInfo
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- CN114163920A CN114163920A CN202111471966.XA CN202111471966A CN114163920A CN 114163920 A CN114163920 A CN 114163920A CN 202111471966 A CN202111471966 A CN 202111471966A CN 114163920 A CN114163920 A CN 114163920A
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- Prior art keywords
- component
- parts
- water
- isocyanate
- mixing
- Prior art date
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 239000000839 emulsion Substances 0.000 claims abstract description 38
- 229920005862 polyol Polymers 0.000 claims abstract description 37
- 150000003077 polyols Chemical class 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 34
- 239000000049 pigment Substances 0.000 claims abstract description 30
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 29
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 19
- 239000002318 adhesion promoter Substances 0.000 claims abstract description 15
- 238000004040 coloring Methods 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 238000009736 wetting Methods 0.000 claims abstract description 15
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 11
- 239000012948 isocyanate Substances 0.000 claims description 32
- 150000002513 isocyanates Chemical class 0.000 claims description 32
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 20
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 20
- 239000011259 mixed solution Substances 0.000 claims description 17
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 16
- 239000003995 emulsifying agent Substances 0.000 claims description 15
- 239000000178 monomer Substances 0.000 claims description 15
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 14
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 14
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 12
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 12
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 11
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 11
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- -1 acrylic ester Chemical class 0.000 claims description 9
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims description 9
- GNSFRPWPOGYVLO-UHFFFAOYSA-N 3-hydroxypropyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCO GNSFRPWPOGYVLO-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 5
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 5
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 5
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims description 5
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 5
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000007259 addition reaction Methods 0.000 claims description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 229920001577 copolymer Polymers 0.000 claims 1
- 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 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 45
- 239000011248 coating agent Substances 0.000 abstract description 43
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- UYAAVKFHBMJOJZ-UHFFFAOYSA-N diimidazo[1,3-b:1',3'-e]pyrazine-5,10-dione Chemical compound O=C1C2=CN=CN2C(=O)C2=CN=CN12 UYAAVKFHBMJOJZ-UHFFFAOYSA-N 0.000 description 11
- 229940116423 propylene glycol diacetate Drugs 0.000 description 11
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000003973 paint Substances 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 8
- 229910000165 zinc phosphate Inorganic materials 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- 239000002609 medium Substances 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 229920006243 acrylic copolymer Polymers 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 4
- 239000007822 coupling agent Substances 0.000 description 4
- SQEDZTDNVYVPQL-UHFFFAOYSA-N dodecylbenzene;sodium Chemical compound [Na].CCCCCCCCCCCCC1=CC=CC=C1 SQEDZTDNVYVPQL-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 235000019832 sodium triphosphate Nutrition 0.000 description 4
- 235000010215 titanium dioxide Nutrition 0.000 description 4
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 4
- 239000000080 wetting agent Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000037452 priming Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000013031 physical testing Methods 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
- 239000012855 volatile organic compound Substances 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
- C08G18/6225—Polymers of esters of acrylic or methacrylic acid
- C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
-
- 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
- C09D5/002—Priming paints
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
Abstract
The invention belongs to the technical field of automobile coatings, and particularly relates to a water-based automobile primer and a preparation method thereof, wherein the water-based automobile primer comprises a component A and a component B; the component A comprises 40-60 parts of polyacrylate polyol emulsion, 0.02-1 part of defoaming agent, 0.2-1.5 parts of flatting agent, 1-2 parts of wetting dispersant, 0.5-1 part of adhesion promoter, 2-10 parts of anti-rust pigment and 0.1-0.5 part of coloring pigment; the component B comprises 80-90 parts of hydrophilic modified polyisocyanate, 1.5-3 parts of anionic surfactant and 10-20 parts of PMA or PGDA; when the water-based automobile primer is used, the component A and the component B are mixed according to the weight ratio (6-8) to 1 for use; the molar ratio of NCO/OH in the water-based automobile primer prepared after mixing is (1.2-1.5): 1, and a coating formed by the components provided by the invention has excellent hardness, adhesive force, gloss and medium resistance.
Description
Technical Field
The invention belongs to the technical field of automobile coatings, and particularly relates to a water-based automobile primer and a preparation method thereof.
Background
Along with the limitation of the emission of volatile organic compounds and harmful air pollutants of the traditional solvent-based paint, the development of high-performance water-based polyurethane paint is imperative. The water-based polyurethane coating takes water as a main dispersion medium, has the advantages of non-inflammability, environmental friendliness, easiness in cleaning and the like, and is widely applied.
The priming paint coating is the basis of the whole coating, the action of the priming paint prevents the oxidation corrosion of the metal surface on one hand, and enhances the adhesive force between the metal surface and the putty or the finish paint and between the putty and the finish paint on the other hand, so the automobile priming paint has higher requirement on the performance of the coating film.
NCO group of curing agent in the existing two-component water-based paint system is easy to react with water to generate CO2Remains in the coating film and further reduces the performance of the coating film; excessive introduction of hydrophilic groups can cause poor chemical medium resistance of a coating film, and in addition, the problems of poor miscibility of two-phase components, slow drying speed and the like exist in the coating construction process, so that the development of the high-performance water-based automobile coating has important significance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the water-based automobile primer and the preparation method thereof, wherein the water-based automobile primer has the advantages of high film forming speed, good film forming property and excellent adhesive force, hardness and dielectric property resistance of a coating film.
Based on the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a water-based automotive primer comprising a component A and a component B; wherein the component A comprises the following components in parts by weight: 40-60 parts of polyacrylate polyol emulsion, 0.02-1 part of defoaming agent, 0.2-1.5 parts of flatting agent, 1-2 parts of wetting dispersant, 0.5-1 part of adhesion promoter, 2-10 parts of antirust pigment and 0.1-0.5 part of coloring pigment;
the component B comprises the following components in parts by weight: 80-90 parts of hydrophilic modified polyisocyanate, 1.5-3 parts of anionic surfactant, and 10-20 parts of propylene glycol monomethyl ether acetate (PMA) or Propylene Glycol Diacetate (PGDA);
when the water-based automobile primer is used, the component A and the component B are mixed according to the weight ratio (6-8) to 1 for use; the molar ratio of NCO/OH in the water-based automobile primer prepared by mixing the component A and the component B is (1.2-1.5): 1.
The water-based automobile primer takes the polyacrylate polyol emulsion as a main film-forming base material, and is mixed with the curing agent hydrophilic modified polyisocyanate for curing to form a film, and the cured film has high adhesive force, hardness and impact resistance, and simultaneously has excellent water resistance and acid and alkali resistance.
Tests show that when the ratio of NCO/OH is low, the surface drying time is favorably shortened, the appearance of a coating film is good, but the adhesion and the hardness are not high, and when the ratio of NCO/OH is high, the hardness of the coating film is increased, the adhesion is improved, but the appearance of the coating film is poor, so when the molar ratio of NCO/OH is (1.2-1.5): 1, the hardness, the adhesion, the gloss and the medium resistance of the film are optimal.
Further, the hydroxyl content of the polyacrylate polyol emulsion is 2-3%.
Tests show that the low hydroxyl content can reduce the crosslinking density, thereby affecting the performance of the coating film, and the coating film has low hardness and low impact resistance; with the increase of the hydroxyl content in the polyacrylate polyol emulsion, the performance of the coating is continuously improved, the hydroxyl content is high, the degree of crosslinking with a curing agent is high during film forming, the performance of the final coating is inevitably improved, for example, the hardness and the adhesive force are increased, but when the hydroxyl content is too low or too high, the medium resistance of the coating is poor, and when the hydroxyl content in the polyacrylate polyol emulsion is 2-3%, the coating has relatively good mechanical property and good medium resistance.
Furthermore, the hydrophilic modified polyisocyanate is prepared by carrying out affinity addition reaction on isocyanate and 2-hydroxyethyl acrylate under the catalysis of dibutyltin dilaurate.
According to the invention, the 2-hydroxyethyl acrylate is adopted to carry out hydrophilic modification on the polyisocyanate, so that the modified polyisocyanate and the polyacrylate polyol emulsion have good compatibility, the film forming speed is high under a relatively low dosage, the formed film has a smooth and glossy appearance, and the film has relatively excellent adhesion and hardness.
Furthermore, the isocyanate is a mixed solution of isophorone diisocyanate and hexamethylene diisocyanate in a volume ratio of (2-3): 1.
The isocyanate is isophorone diisocyanate (IPDI) and has an aliphatic ring structure, the coating film is high in drying speed and hardness, and has high chemical resistance and wear resistance, but the IPDI curing agent is high in viscosity and not easy to disperse by polyol, and the leveling property and gloss of the coating film are inferior to those of Hexamethylene Diisocyanate (HDI); the HDI has a long methylene chain, is low in viscosity, is easily dispersed by polyol, is easy to level and has good appearance, better flexibility and scratch resistance; the HDI ratio of IPDI is preferably (2-3): 1, so that the mixture integrates the advantages of the IPDI and the IPDI, is relatively easily dispersed by polyol, has good appearance of a coating film, and has excellent flexibility, scratch resistance, wear resistance and high hardness.
Further, the defoaming agent is preferably a silicone-based defoaming agent such as dimethylsilicone oil; the leveling agent is preferably a non-ionic acrylic copolymer solution; the wetting and dispersing agent is preferably organic silicon and/or modified organic silicon; the adhesion promoter is preferably phthalate ester coupling agent; the rust-preventive pigment is preferably a zinc phosphate compound such as zinc phosphate, modified zinc phosphate, zinc tripolyphosphate; the coloring pigment is preferably one or more of titanium white, phthalocyanine blue, iron yellow and iron red.
In a second aspect, the invention provides a preparation method of the water-based automobile primer, which comprises the following steps:
(1) the preparation method of the component A comprises the following steps: uniformly stirring the polyacrylate polyol emulsion, the defoaming agent, the flatting agent, the wetting dispersant and the adhesion promoter, adding the anti-rust pigment and the coloring pigment, and uniformly stirring at a high speed;
(2) the preparation method of the component B comprises the following steps: the modified hydrophilic polyisocyanate is prepared by fully and uniformly mixing hydrophilic modified polyisocyanate, anionic surfactant and propylene glycol monomethyl ether acetate (PMA) or Propylene Glycol Diacetate (PGDA).
Further, the polyacrylate polyol emulsion is prepared by the following method:
adding water into an emulsifier and sodium bicarbonate, mixing, keeping the temperature at 80-85 ℃ for 10-12 min, adding an initiator potassium persulfate aqueous solution for 10-15 min, dropwise adding a mixed solution of acrylic acid and an acrylate monomer into the mixed system until the system is in a blue phase and is stable for 30min, heating to 85-90 ℃, curing for 2h, cooling to 50 ℃, and adjusting the pH to 7.5-8.0 to obtain the polyacrylate polyol emulsion.
Furthermore, the acrylic acid and acrylate monomer mixed solution is prepared by mixing methyl methacrylate, n-butyl acrylate, hydroxypropyl methacrylate and methacrylic acid according to the volume ratio of 1:1 (1-2: 1).
The content of hydroxypropyl methacrylate directly determines the hydroxyl content of the emulsion system, and the content of hydroxypropyl methacrylate is in positive correlation with the hydroxyl content of the emulsion system, so that the hydroxyl content of the emulsion system can be controlled to be 2-3% by controlling the proportion.
Further, the emulsifier is formed by mixing nonylphenol polyethoxy ether and sodium dodecyl benzene diphenyl ether disulfonate according to the mass ratio of 1:2, and the addition amount of the emulsifier is 2-3% of the mixed liquid of acrylic acid and acrylate monomers.
Further, the hydrophilically modified polyisocyanate is prepared by the following method:
mixing isocyanate, hydroquinone and dibutyltin dilaurate in acetone, then slowly dropwise adding acrylic acid-2-hydroxyethyl into the mixed solution, and reacting at the temperature of 30-40 ℃ until the NCO value of a system is unchanged to prepare hydrophilic modified polyisocyanate;
the dosage of the hydroquinone is 1.5 to 1.8 weight percent of the weight of the isocyanate; the dosage of the catalyst dibutyl tin dilaurate is 0.8-0.9 wt% of the weight of the isocyanate; the dosage of the 2-hydroxyethyl acrylate is 55 to 70 weight percent of the weight of the isocyanate.
Furthermore, the isocyanate is formed by mixing isophorone diisocyanate and hexamethylene diisocyanate according to the volume ratio of (2-3) to 1.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the hydroxyl content in the polyacrylate polyol emulsion is controlled, so that the coating film has good performances such as adhesion, hardness and the like, and simultaneously has good medium resistance; according to the invention, 2-hydroxyethyl acrylate is used for carrying out hydrophilic modification on isocyanate, the modified polyisocyanate has good compatibility with polyacrylate polyol emulsion, the film forming speed is high under a relatively low dosage, the formed coating film has a flat and glossy appearance, and the coating film has strong adhesive force and hardness.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It will be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The test methods used in the examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are commercially available unless otherwise specified.
Example 1
The embodiment provides a water-based automobile primer, which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 40 parts of polyacrylate polyol emulsion with the hydroxyl content of 2%, 0.02 part of defoaming agent, 0.2 part of flatting agent, 2 parts of wetting dispersant, 0.5 part of adhesion promoter, 2 parts of antirust pigment and 0.1 part of coloring pigment; the component B comprises the following components in parts by weight: 80 parts of hydrophilic modified polyisocyanate, 1.5 parts of anionic surfactant and 20 parts of propylene glycol monomethyl ether acetate (PMA) or Propylene Glycol Diacetate (PGDA).
Among them, the defoaming agent is preferably a silicone-based defoaming agent such as dimethylsilicone oil; the leveling agent is preferably a nonionic acrylic copolymer solution; the wetting and dispersing agent is preferably organic silicon and/or modified organic silicon; the adhesion promoter is preferably phthalate ester coupling agent; the rust-preventive pigment is preferably a zinc phosphate compound such as zinc phosphate, modified zinc phosphate, zinc tripolyphosphate; the coloring pigment is preferably one or more of titanium white, phthalocyanine blue, iron yellow and iron red.
The preparation method of the water-based automobile primer comprises the following steps:
s1: preparation of polyacrylate polyol emulsion:
adding water into an emulsifier and sodium bicarbonate, mixing, keeping the temperature at 85 ℃ for 10min, adding an initiator potassium persulfate aqueous solution for 10min, dropwise adding a mixed solution of acrylic acid and an acrylate monomer into the mixed system until the system is in a blue phase and is stable for 30min, then heating to 85 ℃, curing for 2h, cooling to 50 ℃, and adjusting the pH to 7.5-8.0 to obtain the polyacrylate polyol emulsion. The acrylic acid and acrylate monomer mixed solution is prepared by mixing methyl methacrylate, n-butyl acrylate, hydroxypropyl methacrylate and methacrylic acid according to the volume ratio of 1:1:1: 1. The emulsifier is formed by mixing nonylphenol polyethoxy ether and sodium dodecyl benzene diphenyl ether disulfonate according to the mass ratio of 1:2, and the addition amount of the emulsifier is 2% of the mixed liquid of acrylic acid and acrylate monomers.
S2: preparation of component A:
uniformly stirring the polyacrylate polyol emulsion, the defoaming agent, the flatting agent, the wetting dispersant and the adhesion promoter, adding the antirust pigment and the coloring pigment, and uniformly stirring at a high speed to obtain a component A;
s3: preparation of hydrophilic modified polyisocyanate:
mixing isocyanate, hydroquinone and dibutyltin dilaurate in acetone, then slowly dropwise adding acrylic acid-2-hydroxyethyl into the mixed solution, and reacting at 35 ℃ until the NCO value of the system is unchanged to obtain the hydrophilic modified polyisocyanate.
Wherein, the dosage of the hydroquinone is 1.5wt percent of the weight of the isocyanate; the amount of the catalyst dibutyl tin dilaurate is 0.8 wt% of the weight of the isocyanate; 2-hydroxyethyl acrylate was used in an amount of 55% by weight based on the weight of the isocyanate. The isocyanate is prepared by mixing isophorone diisocyanate and hexamethylene diisocyanate according to the volume ratio of 2: 1.
S4: preparation of the component B:
and fully and uniformly mixing the hydrophilic modified polyisocyanate, the anionic surfactant and the PMA or PGDA to obtain the component B.
S5: when the water-based automobile primer is used, the component A and the component B are mixed according to the weight ratio of 6: 1; the molar ratio of NCO/OH in the prepared water-based automobile primer is 1.2:1 after mixing.
Example 2
The embodiment provides a water-based automobile primer, which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 50 parts of polyacrylate polyol emulsion with the hydroxyl content of 2.5 percent, 0.06 part of defoaming agent, 1.0 part of flatting agent, 1.5 parts of wetting dispersant, 0.6 part of adhesion promoter, 3 parts of antirust pigment and 0.5 part of coloring pigment; the component B comprises the following components in parts by weight: 85 parts of hydrophilic modified polyisocyanate, 2 parts of anionic surfactant and 15 parts of PMA or PGDA.
Among them, the defoaming agent is preferably a silicone-based defoaming agent such as dimethylsilicone oil; the leveling agent is preferably a nonionic acrylic copolymer solution; the wetting and dispersing agent is preferably organic silicon and/or modified organic silicon; the adhesion promoter is preferably phthalate ester coupling agent; the rust-preventive pigment is preferably a zinc phosphate compound such as zinc phosphate, modified zinc phosphate, zinc tripolyphosphate; the coloring pigment is preferably one or more of titanium white, phthalocyanine blue, iron yellow and iron red.
The preparation method of the water-based automobile primer comprises the following steps:
s1: preparation of polyacrylate polyol emulsion:
adding water into an emulsifier and sodium bicarbonate, mixing, keeping the temperature at 85 ℃ for 10min, adding an initiator potassium persulfate aqueous solution for 10min, dropwise adding a mixed solution of acrylic acid and an acrylate monomer into the mixed system until the system is in a blue phase and is stable for 30min, then heating to 85 ℃, curing for 2h, cooling to 50 ℃, and adjusting the pH to 7.5-8.0 to obtain the polyacrylate polyol emulsion. The acrylic acid and acrylate monomer mixed solution is prepared by mixing methyl methacrylate, n-butyl acrylate, hydroxypropyl methacrylate and methacrylic acid according to the volume ratio of 1:1:1.5: 1. The emulsifier is formed by mixing nonylphenol polyethoxy ether and sodium dodecyl benzene diphenyl ether disulfonate according to the mass ratio of 1:2, and the addition amount of the emulsifier is 2.5 percent of the mixed liquid of acrylic acid and acrylate monomers.
S2: preparation of component A:
and uniformly stirring the polyacrylate polyol emulsion, the defoaming agent, the flatting agent, the wetting dispersant and the adhesion promoter, adding the antirust pigment and the coloring pigment, and uniformly stirring at a high speed to obtain the component A.
S3: preparation of hydrophilic modified polyisocyanate:
mixing isocyanate, hydroquinone and dibutyltin dilaurate in acetone, then slowly dropwise adding acrylic acid-2-hydroxyethyl into the mixed solution, and reacting at 35 ℃ until the NCO value of the system is unchanged to obtain the hydrophilic modified polyisocyanate.
Wherein, the dosage of the hydroquinone is 1.5wt percent of the weight of the isocyanate; the amount of the catalyst dibutyl tin dilaurate is 0.8 wt% of the weight of the isocyanate; 2-hydroxyethyl acrylate was used in an amount of 60% by weight based on the weight of isocyanate. The isocyanate is prepared by mixing isophorone diisocyanate and hexamethylene diisocyanate according to the volume ratio of 2.5: 1.
S4: preparation of the component B:
and fully and uniformly mixing the hydrophilic modified polyisocyanate, the anionic surfactant and the PMA or PGDA to obtain the component B.
S5: when the water-based automobile primer is used, the component A and the component B are mixed according to the weight ratio of 7: 1; the molar ratio of NCO/OH in the prepared water-based automobile primer is 1.35:1 after mixing.
Example 3
The embodiment provides a water-based automobile primer, which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 60 parts of polyacrylate polyol emulsion with the hydroxyl content of 3%, 1 part of defoaming agent, 1.5 parts of flatting agent, 2 parts of wetting dispersant, 1 part of adhesion promoter, 10 parts of antirust pigment and 0.5 part of coloring pigment; the component B comprises the following components in parts by weight: 90 parts of hydrophilic modified polyisocyanate, 3 parts of anionic surfactant and 20 parts of PMA or PGDA.
Among them, the defoaming agent is preferably a silicone-based defoaming agent such as dimethylsilicone oil; the leveling agent is preferably a nonionic acrylic copolymer solution; the wetting and dispersing agent is preferably organic silicon and/or modified organic silicon; the adhesion promoter is preferably phthalate ester coupling agent; the rust-preventive pigment is preferably a zinc phosphate compound such as zinc phosphate, modified zinc phosphate, zinc tripolyphosphate; the coloring pigment is preferably one or more of titanium white, phthalocyanine blue, iron yellow and iron red.
The preparation method of the water-based automobile primer comprises the following steps:
s1: preparation of polyacrylate polyol emulsion:
adding water into an emulsifier and sodium bicarbonate, mixing, keeping the temperature at 85 ℃ for 10min, adding an initiator potassium persulfate aqueous solution for 10min, dropwise adding a mixed solution of acrylic acid and an acrylate monomer into the mixed system until the system is in a blue phase and is stable for 30min, then heating to 85 ℃, curing for 2h, cooling to 50 ℃, and adjusting the pH to 7.5-8.0 to obtain the polyacrylate polyol emulsion. The acrylic acid and acrylate monomer mixed solution is prepared by mixing methyl methacrylate, n-butyl acrylate, hydroxypropyl methacrylate and methacrylic acid according to the volume ratio of 1:1:2: 1. The emulsifier is formed by mixing nonylphenol polyethoxy ether and sodium dodecyl benzene diphenyl ether disulfonate according to the mass ratio of 1:2, and the addition amount of the emulsifier is 3% of the mixed liquid of acrylic acid and acrylate monomers.
S2: preparation of component A:
uniformly stirring the polyacrylate polyol emulsion, the defoaming agent, the flatting agent, the wetting dispersant and the adhesion promoter, adding the antirust pigment and the coloring pigment, and uniformly stirring at a high speed to obtain a component A;
s3: preparation of hydrophilic modified polyisocyanate:
mixing isocyanate, hydroquinone and dibutyltin dilaurate in acetone, then slowly dropwise adding acrylic acid-2-hydroxyethyl into the mixed solution, and reacting at 35 ℃ until the NCO value of the system is unchanged to obtain the hydrophilic modified polyisocyanate.
Wherein, the dosage of the hydroquinone is 1.8wt percent of the weight of the isocyanate; the amount of the catalyst dibutyl tin dilaurate is 0.9 wt% of the weight of the isocyanate; 2-hydroxyethyl acrylate was used in an amount of 70% by weight based on the weight of the isocyanate. The isocyanate is prepared by mixing isophorone diisocyanate and hexamethylene diisocyanate according to the volume ratio of 3: 1.
S4: preparation of the component B:
and fully and uniformly mixing the hydrophilic modified polyisocyanate, the anionic surfactant and the PMA or PGDA to obtain the component B.
S5: when the water-based automobile primer is used, the component A and the component B are mixed according to the weight ratio of 8: 1; the molar ratio of NCO/OH in the prepared water-based automobile primer is 1.5:1 after mixing.
The performance of the coating films prepared from the components and the preparation methods described in examples 1-3 was analyzed, with the sample plate requirements for physical testing: except that the water resistance, the engine oil resistance, the acid resistance, the alkali resistance and the salt spray performance adopt steel plates, the other steel plates adopt tinplate plates; the sample size is 10cm multiplied by 5cm, the surface is degreased and polished, then the coating of the embodiment 1-3 is respectively sprayed, the surface is dried for 20min, and then the sample is baked for 30min at 80 ℃; the salt spray resistant performance plate requires that the dry film thickness is 65 +/-2 mu m, and the dry film thickness of other performance plates is 25 +/-2 mu m; the above samples were tested for their correlation properties according to the relevant national standards of the coating industry, and the results are shown in Table 1.
TABLE 1 correlation of the properties of the coating films of examples 1 to 3
As can be seen from Table 1, the coating film prepared by the components and the preparation method has strong adhesion, hardness and impact resistance, and has good medium resistance, heat resistance and salt fog resistance.
Example 4
In this example, the influence of the hydroxyl group content in the polyacrylate polyol emulsion on the final coating film performance is analyzed, referring to the raw material composition ratio and the preparation method described in example 1, the hydroxyl group content in the polyacrylate polyol emulsion is adjusted to 1%, 1.5%, 2%, 3%, and 3.5%, respectively, by adjusting the hydroxypropyl methacrylate content in the polyacrylate polyol emulsion, which are sequentially recorded as samples 1 to 5, specifically, see table 2, and the coating film performance is detected by referring to the above method, and the detection results are shown in table 2.
TABLE 2 correlation of coating film properties of samples 1 to 5
As can be seen from Table 2, the adhesion, hardness and impact resistance of the coating film tend to increase with the increase of the hydroxyl content in the polyacrylate polyol emulsion, because the increase of the hydroxyl content is helpful for improving the crosslinking degree of the reaction with the curing agent NCO group during film formation, so as to enhance the mechanical property of the coating film; however, since the dielectric resistance of the coating film is reduced with the increase of the hydroxyl group content, a polyacrylate polyol emulsion having a hydroxyl group content of 2% to 3% is preferable, and the coating film formed with the curing agent has not only excellent mechanical properties but also good dielectric resistance.
Example 5
In this example, the effect of NCO/OH ratio on the performance of the coating film is analyzed, and the specific test method is as follows: referring to the composition ratio and the preparation method described in example 1, the weight ratio of the component a to the component B is adjusted so that the molar ratio of NCO/OH in the mixed water-based automobile primer is 0.8:1, 1:1, 1.2:1, 1.5:1 and 2:1 in sequence, which are denoted as samples 1 to 5, specifically, see table 3, and the coating film performance is detected by referring to the above method, and the detection result is shown in table 3.
TABLE 3 correlation of coating properties of samples 1 to 5
As can be seen from Table 3, when the NCO/OH ratio is low, the coating film appearance is good, but the adhesion and hardness are not high, and when the NCO/OH ratio is high, the coating film hardness is increased, the adhesion is improved, but the coating film appearance is poor, so that when the NCO/OH molar ratio is (1.2-1.5): 1, the hardness, adhesion, gloss and dielectric resistance of the film are optimal.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The water-based automobile primer is characterized by comprising a component A and a component B;
the component A comprises the following components in parts by weight: 40-60 parts of polyacrylate polyol emulsion, 0.02-1 part of defoaming agent, 0.2-1.5 parts of flatting agent, 1-2 parts of wetting dispersant, 0.5-1 part of adhesion promoter, 2-10 parts of antirust pigment and 0.1-0.5 part of coloring pigment;
the component B comprises the following components in parts by weight: 80-90 parts of hydrophilic modified polyisocyanate, 1.5-3 parts of anionic surfactant and 10-20 parts of PMA or PGDA;
when the water-based automobile primer is used, the component A and the component B are mixed according to the weight ratio (6-8) to 1 for use; the molar ratio of NCO/OH in the water-based automobile primer prepared by mixing the component A and the component B is (1.2-1.5): 1.
2. The water-based automotive primer of claim 1, wherein the polyacrylate polyol emulsion has a hydroxyl content of 2% to 3%.
3. The waterborne automotive primer of claim 1, wherein the hydrophilically-modified polyisocyanate is prepared by an affinity addition reaction of isocyanate with 2-hydroxyethyl acrylate catalyzed by dibutyltin dilaurate.
4. The water-based automobile primer according to claim 3, wherein the isocyanate is a mixed solution of isophorone diisocyanate and hexamethylene diisocyanate in a volume ratio of (2-3): 1.
5. The preparation method of the water-based automobile primer is characterized by comprising the following steps of:
(1) the preparation method of the component A comprises the following steps: uniformly stirring the polyacrylate polyol emulsion, the defoaming agent, the flatting agent, the wetting dispersant and the adhesion promoter, adding the antirust pigment and the coloring pigment, and uniformly stirring at a high speed;
(2) the preparation method of the component B comprises the following steps: the modified hydrophilic polyisocyanate is prepared by fully and uniformly mixing hydrophilic modified polyisocyanate, anionic surfactant and PMA or PGDA.
6. The method of claim 5, wherein the polyacrylate polyol emulsion is prepared by:
adding water into an emulsifier and sodium bicarbonate, mixing, keeping the temperature at 80-85 ℃ for 10-12 min, adding an initiator potassium persulfate aqueous solution for 10-15 min, dropwise adding a mixed solution of acrylic acid and an acrylate monomer into the mixed system until the system is in a blue phase and is stable for 30min, heating to 85-90 ℃, curing for 2h, cooling to 50 ℃, and adjusting the pH to 7.5-8.0 to obtain the polyacrylate polyol emulsion.
7. The method according to claim 6, wherein the acrylic acid/acrylic ester monomer mixture is prepared by mixing methyl methacrylate, n-butyl acrylate, hydroxypropyl methacrylate and methacrylic acid in a volume ratio of 1:1 (1-2: 1).
8. The preparation method of the acrylic acid/acrylate copolymer emulsion is characterized in that the emulsifier is prepared by mixing nonylphenol polyethoxy ether and sodium dodecyl diphenyl oxide disulfonate according to a mass ratio of 1:2, and the addition amount of the emulsifier is 2-3% of the mixed solution of acrylic acid and acrylate monomers.
9. The method according to claim 5, wherein the hydrophilically modified polyisocyanate is prepared by:
mixing isocyanate, hydroquinone and dibutyltin dilaurate in acetone, then slowly dropwise adding acrylic acid-2-hydroxyethyl into the mixed solution, and reacting at the temperature of 30-40 ℃ until the NCO value of a system is unchanged to prepare hydrophilic modified polyisocyanate;
the dosage of the hydroquinone is 1.5 to 1.8 weight percent of the weight of the isocyanate; the dosage of the dibutyltin dilaurate is 0.8-0.9 wt% of the weight of the isocyanate; the dosage of the 2-hydroxyethyl acrylate is 55 to 70 weight percent of the weight of isocyanate.
10. The preparation method of the isocyanate, according to the claim 9, is characterized in that the isocyanate is prepared by mixing isophorone diisocyanate and hexamethylene diisocyanate according to a volume ratio of (2-3) to 1.
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Application publication date: 20220311 |