CN113717628A - Water-based PU coating and preparation method and application thereof - Google Patents
Water-based PU coating and preparation method and application thereof Download PDFInfo
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- CN113717628A CN113717628A CN202111098238.9A CN202111098238A CN113717628A CN 113717628 A CN113717628 A CN 113717628A CN 202111098238 A CN202111098238 A CN 202111098238A CN 113717628 A CN113717628 A CN 113717628A
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- 238000000576 coating method Methods 0.000 title claims abstract description 153
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 239000011248 coating agent Substances 0.000 title claims abstract description 144
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000004814 polyurethane Substances 0.000 claims abstract description 124
- 238000001035 drying Methods 0.000 claims abstract description 53
- 229920005989 resin Polymers 0.000 claims abstract description 51
- 239000011347 resin Substances 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 50
- 229920000180 alkyd Polymers 0.000 claims abstract description 44
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229920001225 polyester resin Polymers 0.000 claims abstract description 38
- 239000004645 polyester resin Substances 0.000 claims abstract description 38
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 36
- 230000003647 oxidation Effects 0.000 claims abstract description 36
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- 239000002562 thickening agent Substances 0.000 claims abstract description 18
- 239000006184 cosolvent Substances 0.000 claims abstract description 17
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000000080 wetting agent Substances 0.000 claims abstract description 15
- 239000012948 isocyanate Substances 0.000 claims abstract description 13
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 13
- 239000013530 defoamer Substances 0.000 claims abstract description 8
- 229920002635 polyurethane Polymers 0.000 claims abstract description 8
- 239000003973 paint Substances 0.000 claims description 35
- 239000002131 composite material Substances 0.000 claims description 25
- 229920003023 plastic Polymers 0.000 claims description 25
- 239000004033 plastic Substances 0.000 claims description 25
- 238000005507 spraying Methods 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 20
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 15
- 239000003085 diluting agent Substances 0.000 claims description 15
- 239000000194 fatty acid Substances 0.000 claims description 15
- 229930195729 fatty acid Natural products 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 13
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000002518 antifoaming agent Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 9
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 9
- 229920000570 polyether Polymers 0.000 claims description 9
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 9
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 8
- 229920000587 hyperbranched polymer Polymers 0.000 claims description 8
- 229920000728 polyester Polymers 0.000 claims description 8
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 7
- 238000005886 esterification reaction Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000002987 primer (paints) Substances 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 4
- 125000001931 aliphatic group Chemical group 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 230000032050 esterification Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 4
- -1 polydimethylsiloxane Polymers 0.000 claims description 4
- 239000005056 polyisocyanate Substances 0.000 claims description 4
- 229920001228 polyisocyanate Polymers 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 3
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 229910021485 fumed silica Inorganic materials 0.000 claims description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 3
- 238000006068 polycondensation reaction Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 230000008033 biological extinction Effects 0.000 claims 1
- 239000004210 ether based solvent Substances 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 14
- 230000001070 adhesive effect Effects 0.000 abstract description 14
- 239000000919 ceramic Substances 0.000 abstract description 4
- 239000011521 glass Substances 0.000 abstract description 4
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 3
- 239000002861 polymer material Substances 0.000 abstract description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 12
- 239000002904 solvent Substances 0.000 description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000004132 cross linking Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 230000001590 oxidative effect Effects 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 1
- CUDYYMUUJHLCGZ-UHFFFAOYSA-N 2-(2-methoxypropoxy)propan-1-ol Chemical compound COC(C)COC(C)CO CUDYYMUUJHLCGZ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000005002 finish coating Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 238000004383 yellowing 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
-
- 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/46—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen
- C08G18/4692—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen containing silicon
-
- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
-
- 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
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
- C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C08G81/024—Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G
- C08G81/027—Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G containing polyester or polycarbonate sequences
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
- C08J2333/12—Homopolymers or copolymers of methyl methacrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2355/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2323/00 - C08J2353/00
- C08J2355/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
- C08J2475/06—Polyurethanes from polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2487/00—Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
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- 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)
- General Chemical & Material Sciences (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a water-based PU coating and a preparation method and application thereof, wherein the water-based PU coating comprises a component A and a component B, the component B comprises an isocyanate curing agent, and the component A comprises the following components in parts by weight: 40-50 parts of water-based hyperbranched hydroxyl polyester resin, 30-40 parts of water-based alkyd acrylic hybrid oxidation drying resin, 0.3-1.0 part of water-based polyurethane thickener, 0.1-0.2 part of defoamer, 1.0-2.5 parts of base material wetting agent, 0.2-0.5 part of dispersant, 2-4 parts of matting powder, 0.5-1.0 part of flatting agent, 4-8 parts of cosolvent and 1-15 parts of water. According to the water-based PU coating, the water-based hyperbranched hydroxyl polyester resin and the water-based alkyd acrylic hybrid oxidation drying resin are matched for use, so that the water-based PU coating has excellent water resistance and weather resistance on high polymer materials, and has excellent adhesive force on inorganic non-metal base materials such as glass, ceramic and the like.
Description
Technical Field
The invention relates to the field of water-based paint, in particular to water-based PU paint. In addition, the invention also relates to a preparation method and application of the water-based PU coating.
Background
At present, oil paint is adopted for spraying composite plastic materials in the market, but the oil paint has high VOC content and has great environmental pollution. In recent years, the total coating yield is about 2000 ten thousand tons, the VOC emission reaches 500 and 600 ten thousand tons, and the VOC emission is an important source of PM2.5, so that the oil-based coating cannot meet the increasingly strict environmental protection requirement. Therefore, the development of a water-based friendly coating for replacing the current high-VOC oily coating to reduce VOC emission is urgently needed. The water-based paint uses water as a solvent, so that organic volatile matter pollution caused by using a large amount of organic solvent in the solvent-based paint is reduced, the fire hazard during construction is eliminated, the atmospheric pollution is reduced, and the working environment condition is improved, so that the water-based paint has the advantages of construction, economy, safety and application compared with the traditional solvent-based paint.
With the rapid development of the 3C electronic industry in recent years, the amount of the coating playing a role in protecting and decorating the surface of each product is increasing. The materials used are also constantly updated to meet the actual application needs of different products. In order to meet the composite plastic materials with different structural strength and performance requirements, the market has appeared a polymer composite plastic material: PBT + PCR, PC + GF, PA + GF, PC + ABS and COC + PMMA but lack a water paint coating which can meet the adhesion requirement on all composite plastic materials. At present, different water paint coatings can be used only for different composite plastic materials. Therefore, the mass production cost is also increased due to poor versatility of the aqueous paint coating.
Disclosure of Invention
The invention provides a water-based PU coating, a preparation method and application thereof, and aims to solve the technical problems that different water-based paint coatings can only be used for different composite plastic materials due to poor universality of the water-based paint coatings, and the adhesion force is poor.
The technical scheme adopted by the invention is as follows:
a water-based PU coating comprises a component A and a component B, wherein the component B comprises an isocyanate curing agent, and the component A comprises the following components in parts by weight: 40-50 parts of water-based hyperbranched hydroxyl polyester resin, 30-40 parts of water-based alkyd acrylic hybrid oxidation drying resin, 0.3-1.0 part of water-based polyurethane thickener, 0.1-0.2 part of defoamer, 1.0-2.5 parts of base material wetting agent, 0.2-0.5 part of dispersant, 2-4 parts of matting powder, 0.5-1.0 part of flatting agent, 4-8 parts of cosolvent and 1-15 parts of water.
Further, 40-45 parts of water-based hyperbranched hydroxyl polyester resin, 35-40 parts of water-based alkyd acrylic acid hybrid oxidation drying resin, 0.5-1.0 part of water-based polyurethane thickener, 0.1-0.2 part of defoamer, 1.0-1.5 parts of base material wetting agent, 0.3-0.5 part of dispersant, 3-4 parts of matting powder, 0.5-0.8 part of flatting agent, 6-7 parts of cosolvent and 1-15 parts of water.
Further, the aqueous hyperbranched modified polyester resin is a viscous polyester hyperbranched polymer with hydroxyl at the tail end, which is obtained By taking a By type polyhydroxy compound as a core molecule and carrying out vacuum melt polycondensation, and then the polyester hyperbranched polymer is reacted with silicate to form organic-inorganic hybrid resin; the solid content of the waterborne hyperbranched modified polyester resin is 45-60%; the hydroxyl value of the waterborne hyperbranched modified polyester resin is less than or equal to 90 mgKOH/g.
Further, the waterborne alkyd acrylic hybrid oxidation drying resin is obtained by carrying out esterification reaction on a fatty acid modified acrylic prepolymer and an alkyd prepolymer; the solid content of the water-based alkyd acrylic hybrid oxidation drying resin is 40-50%.
Further, the preparation method of the water-based alkyd acrylic hybrid oxidation drying resin comprises the following steps: mixing the fatty acid modified acrylic prepolymer and the alkyd prepolymer, heating to 180 ℃ in a nitrogen atmosphere for esterification, measuring the acid value, ending the reaction when the acid value is lower than 25mgKOH/g, cooling to 120 ℃, adding butyl glycol ether, continuously cooling to 80 ℃, adding triethylamine, adding water for dilution until the solid content is lower than 50%, and obtaining the water-based alkyd acrylic hybrid oxidation drying resin.
Further, the thickener adopts an associative thickener with pseudoplastic fluid flow; and/or the defoaming agent is a polyether defoaming agent; and/or, the substrate wetting agent is a modified polyether siloxane copolymer.
Further, the dispersing agent adopts nonionic modified fatty acid derivative solution; and/or, the matting powder adopts fumed silica; and/or the leveling agent adopts at least one of polyether siloxane copolymer and ethoxy polydimethylsiloxane; and/or the cosolvent adopts an alcohol ether solvent.
Further, the mass ratio of the component A to the component B is 100: 20-30; the isocyanate curing agent adopts Hexamethylene Diisocyanate (HDI) aliphatic polyisocyanate curing agent.
According to another aspect of the present invention, there is also provided a preparation method of the above waterborne PU coating, comprising the steps of:
s1, mixing the waterborne hyperbranched hydroxyl polyester resin with waterborne fatty acid ester modified propylene oxidation drying resin;
s2, stirring at 600-900 rpm, sequentially adding a thickening agent, a defoaming agent, a base material wetting agent and a dispersing agent, and uniformly mixing;
s3, stirring at 800-1000 rpm, adding matting powder, and dispersing;
s4, stirring at 800-1000 r/min, adding the leveling agent, the cosolvent and water, uniformly mixing, and filtering to obtain a component A;
and S4, uniformly mixing the component A and the component B to obtain the water-based PU coating.
Further, in step S3, the dispersion time is 10min to 15min, and the dispersion is performed until the fineness is less than 15 μm; in step S4, a 250-350 mesh screen or filter cloth is used for filtering.
According to another aspect of the invention, the application of the water-based PU coating on the surface of a composite plastic material is also provided, and the composite plastic material comprises at least one of PBT + PCR, PC + GF, PA + GF, PC + ABS and COC + PMMA.
Further, the water-based PU coating or the water-based PU coating diluent is sprayed on the base material of the composite plastic material, and the spraying air pressure is 3kgf/cm2～4kgf/cm2Baking and curing at 60-70 ℃ for 20-30 min to obtain a primer coating; or spraying the water-based PU coating or the water-based PU coating diluent on the base material of the composite plastic material at the spraying air pressure of 3kgf/cm2～4kgf/cm2And baking and curing at 60-70 ℃ for 100-150 min to obtain a finish paint film, wherein the thickness of the paint film is 15-20 mu m.
The invention has the following beneficial effects:
the water-based PU coating disclosed by the invention is mainly characterized in that film-forming resin is water-based hyperbranched hydroxyl polyester resin and water-based alkyd acrylic hybrid oxidation drying resin, and an isocyanate curing agent is added, so that hydroxyl in the water-based hyperbranched hydroxyl polyester resin and NCO in the isocyanate curing agent are subjected to a crosslinking reaction, and a compact network structure is formed. The waterborne alkyd acrylic hybrid oxidation drying resin can be naturally dried in the air, and the addition of the resin enables a coating formed by the waterborne PU coating to have a cavity porous structure and the penetration of oxygen to be deeper, so that the waterborne PU coating has a faster drying speed, a higher crosslinking density and a more compact three-dimensional network structure. The waterborne hyperbranched hydroxyl polyester resin and the waterborne alkyd acrylic hybrid oxidation drying resin are matched for use, so that the waterborne PU coating has excellent water resistance and weather resistance on high polymer materials and also has excellent adhesive force on inorganic non-metal base materials such as glass, ceramic and the like. The waterborne PU coating has strong applicability and excellent adhesive force on high molecular and inorganic non-metallic materials. And before the water-based PU coating is not completely cured, PU finishing coat, UV finishing coat, rubber paint and the like can be continuously sprayed on the formed coating, and the interlayer adhesive force is excellent. In addition, the coating formed by the water-based PU coating has the characteristics of high drying speed, high production efficiency and low energy consumption, and can also adopt water as a diluent to effectively reduce the content of VOC in the coating. The water-based PU coating has no pollution in the spraying process, greatly improves the construction environment and belongs to a green and environment-friendly product.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
The waterborne PU coating comprises a component A and a component B, wherein the component B comprises an isocyanate curing agent, and the component A comprises the following components in parts by weight: 40-50 parts of water-based hyperbranched hydroxyl polyester resin, 30-40 parts of water-based alkyd acrylic hybrid oxidation drying resin, 0.3-1.0 part of water-based polyurethane thickener, 0.1-0.2 part of defoamer, 1.0-2.5 parts of base material wetting agent, 0.2-0.5 part of dispersant, 2-4 parts of matting powder, 0.5-1.0 part of flatting agent, 4-8 parts of cosolvent and 1-15 parts of water.
The water-based PU coating disclosed by the invention is mainly characterized in that film-forming resin is water-based hyperbranched hydroxyl polyester resin and water-based alkyd acrylic hybrid oxidation drying resin, and an isocyanate curing agent is added, so that hydroxyl in the water-based hyperbranched hydroxyl polyester resin and NCO in the isocyanate curing agent are subjected to a crosslinking reaction, and a compact network structure is formed. The waterborne alkyd acrylic hybrid oxidation drying resin can be naturally dried in the air, and the addition of the resin enables a coating formed by the waterborne PU coating to have a cavity porous structure and the penetration of oxygen to be deeper, so that the waterborne PU coating has a faster drying speed, a higher crosslinking density and a more compact three-dimensional network structure. The waterborne hyperbranched hydroxyl polyester resin and the waterborne alkyd acrylic hybrid oxidation drying resin are matched for use, so that the waterborne PU coating has excellent water resistance and weather resistance on high polymer materials and also has excellent adhesive force on inorganic non-metal base materials such as glass, ceramic and the like. The waterborne PU coating has strong applicability and excellent adhesive force on high molecular and inorganic non-metallic materials. And before the water-based PU coating is not completely cured, PU finishing coat, UV finishing coat, rubber paint and the like can be continuously sprayed on the formed coating, and the interlayer adhesive force is excellent. In addition, the coating formed by the water-based PU coating has the characteristics of high drying speed, high production efficiency and low energy consumption, and can also adopt water as a diluent to effectively reduce the content of VOC in the coating. The water-based PU coating has no pollution in the spraying process, greatly improves the construction environment and belongs to a green and environment-friendly product.
In the embodiment, 40-45 parts of water-based hyperbranched hydroxyl polyester resin, 35-40 parts of water-based alkyd acrylic acid hybrid oxidation drying resin, 0.5-1.0 part of water-based polyurethane thickener, 0.1-0.2 part of defoamer, 1.0-1.5 parts of base material wetting agent, 0.3-0.5 part of dispersant, 3-4 parts of matting powder, 0.5-0.8 part of flatting agent, 6-7 parts of cosolvent and 1-15 parts of water. The components of the water-based PU coating are matched with each other, and the formed coating has better water resistance, weather resistance and adhesive force.
Preferably, 40 parts of waterborne hyperbranched hydroxyl polyester resin, 35 parts of waterborne alkyd acrylic hybrid oxidation drying resin, 0.5 part of waterborne polyurethane thickener, 0.1 part of defoamer, 1.2 parts of base material wetting agent, 0.3 part of dispersant, 3 parts of matting powder, 0.8 part of leveling agent, 6 parts of cosolvent and 13.1 parts of water.
In this embodiment, the aqueous hyperbranched modified polyester resin is a viscous polyester hyperbranched polymer with hydroxyl at the terminal, which is obtained By using a By type polyhydroxy compound as a core molecule and performing vacuum melt polycondensation, and then the polyester hyperbranched polymer is reacted with a silicate to form the organic-inorganic hybrid resin. The solid content of the waterborne hyperbranched modified polyester resin is 45-60%. The hydroxyl value of the waterborne hyperbranched modified polyester resin is less than or equal to 90 mgKOH/g.
The aqueous hyperbranched modified polyester resin is organic-inorganic hybrid resin formed by the reaction of polyester hyperbranched polymer and silicate. The polyester hyperbranched polymer is a high random multistage branched polymer with a three-dimensional spherical stereo structure, has the characteristics of unique low viscosity, rich modifiable functional groups at the tail end and the like, has more terminal groups, can provide higher crosslinking degree, and can form organic-inorganic hybridization with silicate to make up the defects after the silicate film is formed. Thereby improving initial water resistance and thus improving adhesion and abrasion resistance. The conventional silicate coating has poor wear resistance and adhesion. The hydroxyl value of the waterborne hyperbranched modified polyester resin is less than or equal to 90mgKOH/g, the low hydroxyl content can be crosslinked and cured with NCO in a short drying time, and the finish paint can be directly sprayed on a coating formed by the waterborne hyperbranched modified polyester resin in a short time. The curing speed after spraying can be improved, and the adhesive force at the initial stage can be ensured. When the hydroxyl value of the waterborne hyperbranched modified polyester resin is more than 90mgKOH/g, crosslinking and curing are difficult to complete in a short time, long-time baking and curing are needed, and the long-time baking and curing can increase the energy consumption of product construction, so that the practicability is reduced.
In this example, the water-based alkyd acrylic hybrid oxidation drying resin adopts fatty acid modified acrylic prepolymer andalkyd prepolymersCarrying out esterification reaction to obtain the product. The solid content of the water-based alkyd acrylic hybrid oxidation drying resin is 40-50%. The waterborne alkyd acrylic hybrid oxidative drying resin combines the excellent wettability and the filler bearing capacity of alkyd and acrylic acid, and has an obvious cavity porous structure inside, so that oxygen can penetrate more deeply, the waterborne alkyd acrylic hybrid oxidative drying resin has a high drying speed, a high crosslinking density and a compact three-dimensional network structure, and a coating prepared from the waterborne alkyd acrylic hybrid oxidative drying resin has better hardness and fullness, excellent water resistance, excellent drying property and the like. The waterborne alkyd acrylic hybrid oxidation drying resin and the waterborne hyperbranched modified polyester resin are matched with each other, so that the waterborne PU coating toolHas more excellent drying property, excellent adhesive force, surface hardness, coating fullness and chemical resistance. The drying mode of the water-based PU coating is as follows: crosslinking and drying of the waterborne hyperbranched modified polyester resin, an isocyanate curing agent and isocyanate, and oxidizing air natural drying of the waterborne alkyd acrylic hybrid oxidative drying resin are realized without a crosslinking agent participating in reaction and drying.
In this embodiment, the preparation method of the waterborne alkyd acrylic hybrid oxidative drying resin comprises the following steps: mixing the fatty acid modified acrylic prepolymer and the alkyd prepolymer, heating to 180 ℃ in a nitrogen atmosphere for esterification, measuring the acid value, ending the reaction when the acid value is lower than 25mgKOH/g, cooling to 120 ℃, adding butyl glycol ether, continuously cooling to 80 ℃, adding triethylamine, adding water for dilution until the solid content is lower than 50%, and obtaining the water-based alkyd acrylic hybrid oxidation drying resin.
In this example, the thickener was an associative thickener having pseudoplastic fluid flow. And/or the defoaming agent is a polyether defoaming agent; and/or, the substrate wetting agent is a modified polyether siloxane copolymer.
In this example, a nonionic modified fatty acid derivative solution was used as the dispersant. And/or, the matting powder adopts fumed silica. And/or at least one of polyether siloxane copolymer and ethoxy polydimethylsiloxane is adopted as the leveling agent. And/or the cosolvent adopts an alcohol ether solvent. Preferably, the alcohol ether solvent is one or more of diethylene glycol butyl ether, dipropylene glycol methyl ether and propylene glycol methyl ether. The cosolvent adopts an alcohol ether solvent, mainly plays a role in reducing the film forming temperature of the resin and is beneficial to forming a film on a coating. Under the action of baking temperature, the cosolvent gradually diffuses to the coating, long chain segments of polymer molecules mutually permeate and diffuse to form a uniform coating with good performance by winding, and the coating with excellent performance is finally formed along with gradual volatilization of the film-forming assistant from the coating.
In the embodiment, the mass ratio of the component A to the component B is 100: 20-30. The isocyanate curing agent adopts Hexamethylene Diisocyanate (HDI) aliphatic polyisocyanate curing agent. Preferably, the mass ratio of the A component and the B component is 100: 20. The Hexamethylene Diisocyanate (HDI) aliphatic polyisocyanate curing agent has excellent weather resistance, heat resistance, gloss retention, yellowing resistance and color retention and good comprehensive performance.
According to another aspect of the present invention, there is also provided a preparation method of the above waterborne PU coating, comprising the steps of:
s1, mixing the waterborne hyperbranched hydroxyl polyester resin with waterborne fatty acid ester modified propylene oxidation drying resin;
s2, stirring at 600-900 rpm, sequentially adding a thickening agent, a defoaming agent, a base material wetting agent and a dispersing agent, and uniformly mixing;
s3, stirring at 800-1000 rpm, adding matting powder, and dispersing;
s4, stirring at 800-1000 r/min, adding the leveling agent, the cosolvent and water, uniformly mixing, and filtering to obtain a component A;
and S4, uniformly mixing the component A and the component B to obtain the water-based PU coating.
According to the preparation method of the water-based PU coating, the viscosity of the hyperbranched hydroxyl polyester resin and the viscosity of the water-based fatty acid ester modified propylene oxide dry resin are high, other materials can be added only after the components are fully dissolved, and if the adding sequence is changed or the components are added and stirred together, the defects of nonuniform dispersion, easy crystal precipitation and the like can occur.
In this embodiment, in step S3, the dispersion time is 10min to 15min, and the dispersion is performed until the fineness is less than 15 μm. In step S4, a 250-350 mesh screen or filter cloth is used for filtering.
According to another aspect of the invention, the application of the water-based PU coating on the surface of a composite plastic material is also provided, and the composite plastic material comprises at least one of PBT + PCR, PC + GF, PA + GF, PC + ABS and COC + PMMA. The water-based PU coating can be sprayed on PBT + PCR, PC + GF, PA + GF, PC + ABS, COC + PMMA and other composite plastic materials, solves the problem of poor universality of the conventional water-based paint coating, and ensures that the water-based PU coating forms a coating with excellent adhesive force, water resistance and weather resistance on the composite plastic materials. And also has excellent adhesion to inorganic nonmetallic substrates such as glass, ceramics, and the like. And the VOC content is low in the using process, and the paint belongs to a green and environment-friendly product. The water-based PU coating not only has excellent adhesive force on coatings formed by various composite plastic materials, but also eliminates the fire hazard during construction, reduces atmospheric pollution, improves the operating environment, and has the advantages of construction, economy, safety and application compared with the traditional solvent-based coating.
In this example, the aqueous PU coating or the aqueous PU coating diluent was sprayed onto the substrate of the composite plastic material at a spray pressure of 3kgf/cm2～4kgf/cm2And baking and curing at 60-70 ℃ for 20-30 min to obtain a coating film with the thickness of 15-20 mu m.
In this example, the aqueous PU coating or the aqueous PU coating diluent was sprayed onto the substrate of the composite plastic material at a spray pressure of 3kgf/cm2～4kgf/cm2And baking and curing at 60-70 ℃ for 100-150 min to obtain a finish paint film, wherein the thickness of the paint film is 15-20 mu m. Or spraying the water-based PU coating or the water-based PU coating diluent on the base material of the composite plastic material at the spraying air pressure of 3kgf/cm2～4kgf/cm2And baking and curing at 60-70 ℃ for 20-30 min to obtain the primer coating. When preparing the single-coating PU technical coating, the water-based PU coating or the water-based PU coating diluent is sprayed on the base material of the composite plastic material, and the spraying air pressure is 3kgf/cm2～4kgf/cm2And baking and curing at 60-70 ℃ for 100-150 min to obtain the finish paint coating. When the two-coating PU technology is prepared, the water-based PU coating or the water-based PU coating diluent is sprayed on the base material of the composite plastic material, and the spraying air pressure is 3kgf/cm2～4kgf/cm2Baking and curing at 60-70 ℃ for 20-30 min to obtain a primer coating, and directly spraying PU finishing paint or UV finishing paint on the primer coating. Or baking and curing the primer coating for 120min or standing the primer coating at room temperature for 7 days to obtain a finish coating.
Examples
The invention is further illustrated below using a single-coat aqueous PU coating process.
Example 1
The weight parts of the components of the water-based PU coating are shown in Table 1.
TABLE 1 parts by weight of the components of the aqueous PU coatings
The preparation method of the water-based alkyd acrylic hybrid oxidation drying resin comprises the following steps: mixing the fatty acid modified acrylic prepolymer and the alkyd prepolymer, heating to 180 ℃ in a nitrogen atmosphere for esterification, measuring the acid value, ending the reaction when the acid value is 25mgKOH/g, cooling to 120 ℃, adding butyl glycol ether, continuously cooling to 80 ℃, adding triethylamine, adding water for dilution until the solid content is 50%, and obtaining the water-based alkyd acrylic hybrid oxidation drying resin.
The preparation method of the water-based PU coating comprises the following steps:
s1, mixing the waterborne hyperbranched hydroxyl polyester resin with waterborne fatty acid ester modified propylene oxidation drying resin;
s2, stirring at 600-900 rpm, sequentially adding a thickening agent, a defoaming agent, a base material wetting agent and a dispersing agent, and uniformly mixing;
s3, stirring at 800-1000 rpm, adding matting powder, and dispersing for 15min until the fineness is less than 15 μm;
s4, stirring at 800-1000 r/min, adding the leveling agent, the cosolvent and water, uniformly mixing, and filtering by using a 300-mesh sieve to obtain a component A;
and S4, uniformly mixing the component A and the component B to obtain the water-based PU coating.
The application of the water-based PU coating to PBT + PCR comprises the steps of diluting the water-based PU coating with water, wherein the mass ratio of the water-based PU coating to the water is 100: 10, spraying the water-based PU coating diluent on a substrate of the PBT + PCR, and spraying the substrate with the spraying air pressure of 4kgf/cm2And baking and curing at 70 ℃ for 120min to form a paint film with the thickness of 20 mu m, thereby obtaining the paint film.
Example 2
The weight parts of the components of the water-based PU coating are shown in Table 2.
TABLE 2 parts by weight of the components of the aqueous PU coating
The preparation method of the aqueous PU coating is the same as that of example 1.
The application of the water-based PU coating on the PA + GF comprises the steps of diluting the water-based PU coating with water, wherein the mass ratio of the PU coating to the water is 100: 10, spraying the water-based PU coating diluent on a PA + GF substrate, and spraying the spraying air pressure to the substrate with the PA + GF being 3.5kgf/cm2And baking and curing at 70 ℃ for 110min to form a paint film with the thickness of 18 mu m, thereby obtaining the paint film.
Example 3
The weight parts of the components of the water-based PU coating are shown in Table 3.
TABLE 3 parts by weight of the components of the aqueous PU coatings
The preparation method of the aqueous PU coating is the same as that of example 1.
The application of the water-based PU coating on COC + PMMA is characterized in that the water-based PU coating is diluted by water, the mass ratio of the PU coating to the water is 100: 11, the water-based PU coating diluent is sprayed on a substrate of COC + PMMA, and the spraying air pressure is 3.6kgf/cm2And baking and curing at 70 ℃ for 110min to form a paint film with the thickness of 18 mu m, thereby obtaining the paint film.
Comparative example 1
The weight parts of the components of the water-based PU coating are shown in Table 4.
TABLE 4 parts by weight of the components of the aqueous PU coating
The preparation method of the aqueous PU coating is the same as that of example 1.
The waterborne hydroxy acrylic resin is Zhanxin
6514。
The application of the water-based PU coating on COC + PMMA is characterized in that the water-based PU coating is diluted by water, the mass ratio of the PU coating to the water is 100: 15, the water-based PU coating diluent is sprayed on a substrate of the COC + PMMA, and the spraying air pressure is 3.6kgf/cm2And baking and curing at 80 ℃ for 360min to form a paint film with the thickness of 18 mu m, thereby obtaining the paint film.
Comparative example 2
The weight parts of the components of the water-based PU coating are shown in Table 5.
TABLE 5 parts by weight of the components of the aqueous PU coatings
The preparation method of the aqueous PU coating is the same as that of example 1.
The application of the aqueous PU coating is the same as in example 1
Comparative example 3
The weight parts of the components of the waterborne PU coating are shown in Table 6.
TABLE 6 parts by weight of the components of the aqueous PU coatings
The preparation method of the aqueous PU coating is the same as that of example 1.
The application of the aqueous PU coating is the same as in example 1
The examples 1 to 3 and the comparative examples 1 to 3 were applied to the surface of the base material of the composite plastic material, and the performance of the formed coating was tested, and the test results are shown in table 7.
Table 7 results of performance testing
The coating formed by the water-based PU coating in the embodiment 3 has the best comprehensive performance, the conventional and poaching adhesion stability can reach the 0-level standard, the pencil hardness is 500g/3H and has no scratch, RCA is wear-resistant for 150 times and does not have a substrate, MEK (methyl ethyl ketone) solvent is used for scraping and wiping for more than 120 times and does not drop the paint, no foaming and discoloration are caused after high-temperature and high-humidity environment test, and the adhesion can not be reduced and can reach the 0-level standard. Comparative example 1 using a commercially available water-borne hydroxy acrylic resin, it required a longer baking time and the overall properties were significantly inferior to those of the PU coating of the invention. In addition, comparative example 2 and comparative example 3 are comparative verifications of different addition ratios of the aqueous hyperbranched hydroxyl polyester resin and the aqueous alkyd acrylic hybrid oxidation drying resin, when the aqueous hyperbranched hydroxyl polyester resin is higher than the parameter range and the aqueous alkyd acrylic hybrid oxidation drying resin is lower than the parameter range, the RCA and MEK solvent resistance of the PU coating are improved, but the adhesive force and the hardness are reduced, otherwise, when the aqueous hyperbranched hydroxyl polyester resin is lower than the parameter range and the aqueous alkyd acrylic hybrid oxidation drying resin is higher than the parameter range, the RCA and MEK solvent resistance of the PU coating are reduced, but the adhesive force and the hardness are improved, and the comprehensive performance of the coating cannot be ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The water-based PU coating is characterized by comprising a component A and a component B, wherein the component B comprises an isocyanate curing agent, and the component A comprises the following components in parts by weight:
40-50 parts of water-based hyperbranched hydroxyl polyester resin, 30-40 parts of water-based alkyd acrylic hybrid oxidation drying resin, 0.3-1.0 part of water-based polyurethane thickener, 0.1-0.2 part of defoamer, 1.0-2.5 parts of base material wetting agent, 0.2-0.5 part of dispersant, 2-4 parts of matting powder, 0.5-1.0 part of flatting agent, 4-8 parts of cosolvent and 1-15 parts of water.
2. The aqueous PU coating according to claim 1,
40-45 parts of water-based hyperbranched hydroxyl polyester resin, 35-40 parts of water-based alkyd acrylic hybrid oxidation drying resin, 0.5-1.0 part of water-based polyurethane thickener, 0.1-0.2 part of defoamer, 1.0-1.5 parts of base material wetting agent, 0.3-0.5 part of dispersant, 3-4 parts of matting powder, 0.5-0.8 part of flatting agent, 6-7 parts of cosolvent and 1-15 parts of water.
3. The aqueous PU coating according to claim 1 or 2,
the aqueous hyperbranched modified polyester resin is a viscous polyester hyperbranched polymer with hydroxyl at the tail end, which is obtained By taking a By type polyhydroxy compound as a core molecule and carrying out vacuum melt polycondensation, and then the polyester hyperbranched polymer is reacted with silicate to form organic-inorganic hybrid resin;
the solid content of the aqueous hyperbranched modified polyester resin is 45-60%;
the hydroxyl value of the waterborne hyperbranched modified polyester resin is less than or equal to 90 mgKOH/g.
4. The aqueous PU coating according to claim 1 or 2,
the water-based alkyd acrylic hybrid oxidation drying resin is obtained by carrying out esterification reaction on a fatty acid modified acrylic prepolymer and an alkyd prepolymer;
the solid content of the water-based alkyd acrylic hybrid oxidation drying resin is 40-50%.
5. The aqueous PU coating according to claim 4,
the preparation method of the water-based alkyd acrylic hybrid oxidation drying resin comprises the following steps:
mixing the fatty acid modified acrylic prepolymer and the alkyd prepolymer, heating to 180 ℃ in a nitrogen atmosphere for esterification, measuring the acid value, ending the reaction when the acid value is lower than 25mgKOH/g, cooling to 120 ℃, adding butyl glycol ether, continuously cooling to 80 ℃, adding triethylamine, adding water for dilution until the solid content is lower than 50%, and obtaining the water-based alkyd acrylic hybrid oxidation drying resin.
6. The aqueous PU coating according to claim 1 or 2,
the thickening agent adopts an associative thickening agent with pseudoplastic fluid flowing; and/or
The defoaming agent is a polyether defoaming agent; and/or
The substrate wetting agent adopts modified polyether siloxane copolymer.
7. The aqueous PU coating according to claim 1 or 2,
the dispersing agent adopts nonionic modified fatty acid derivative solution; and/or
The extinction powder adopts fumed silica; and/or
The leveling agent is at least one of polyether siloxane copolymer and ethoxy polydimethylsiloxane; and/or
The cosolvent adopts alcohol ether solvents.
8. The aqueous PU coating according to claim 1 or 2,
the mass ratio of the component A to the component B is 100: 20-30;
the isocyanate curing agent adopts Hexamethylene Diisocyanate (HDI) aliphatic polyisocyanate curing agent.
9. A method for preparing an aqueous PU coating according to any one of claims 1 to 8, characterized by comprising the steps of:
s1, mixing the waterborne hyperbranched hydroxyl polyester resin with waterborne fatty acid ester modified propylene oxidation drying resin;
s2, stirring at 600-900 rpm, sequentially adding a thickening agent, a defoaming agent, a base material wetting agent and a dispersing agent, and uniformly mixing;
s3, stirring at 800-1000 rpm, adding matting powder, and dispersing;
s4, stirring at 800-1000 r/min, adding the leveling agent, the cosolvent and water, uniformly mixing, and filtering to obtain a component A;
and S4, uniformly mixing the component A and the component B to obtain the water-based PU coating.
10. The process for producing an aqueous PU coating according to claim 9,
in step S3, dispersing for 10-15 min until the fineness is less than 15 μm;
in step S4, a 250-350 mesh screen or filter cloth is used for filtering.
11. Use of the aqueous PU coating according to any one of claims 1 to 8 on the surface of a composite plastic material, wherein the composite plastic material comprises at least one of PBT + PCR, PC + GF, PA + GF, PC + ABS, COC + PMMA.
12. Use according to claim 11,
spraying the water-based PU coating or the water-based PU coating diluent on a base material of the composite plastic material, wherein the spraying air pressure is 3kgf/cm2～4kgf/cm2Baking and curing at 60-70 ℃ for 20-30 min to obtain a primer coating;or
Spraying the water-based PU coating or the water-based PU coating diluent on a base material of the composite plastic material, wherein the spraying air pressure is 3kgf/cm2～4kgf/cm2And baking and curing at 60-70 ℃ for 100-150 min to obtain a finish paint coating film, wherein the thickness of the coating film is 15-20 mu m.
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