CN115678397A - Water-based double-component polyurethane middle coating suitable for electrostatic spraying - Google Patents
Water-based double-component polyurethane middle coating suitable for electrostatic spraying Download PDFInfo
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- CN115678397A CN115678397A CN202110856464.2A CN202110856464A CN115678397A CN 115678397 A CN115678397 A CN 115678397A CN 202110856464 A CN202110856464 A CN 202110856464A CN 115678397 A CN115678397 A CN 115678397A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000576 coating method Methods 0.000 title claims abstract description 36
- 239000011248 coating agent Substances 0.000 title claims abstract description 34
- 239000004814 polyurethane Substances 0.000 title claims abstract description 29
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 29
- 238000007590 electrostatic spraying Methods 0.000 title claims abstract description 26
- 239000003973 paint Substances 0.000 claims abstract description 44
- 238000002360 preparation method Methods 0.000 claims abstract description 36
- 239000002562 thickening agent Substances 0.000 claims abstract description 34
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 22
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 22
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 22
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims abstract description 18
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 8
- 239000003085 diluting agent Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 57
- 238000001914 filtration Methods 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 31
- 239000006229 carbon black Substances 0.000 claims description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 26
- 238000011049 filling Methods 0.000 claims description 22
- 229910052788 barium Inorganic materials 0.000 claims description 15
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 15
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 15
- 239000002270 dispersing agent Substances 0.000 claims description 15
- FEWFXBUNENSNBQ-UHFFFAOYSA-N 2-hydroxyacrylic acid Chemical compound OC(=C)C(O)=O FEWFXBUNENSNBQ-UHFFFAOYSA-N 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 13
- 239000004408 titanium dioxide Substances 0.000 claims description 13
- 239000012752 auxiliary agent Substances 0.000 claims description 12
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- 239000013530 defoamer Substances 0.000 claims description 10
- 239000002518 antifoaming agent Substances 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 7
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- 230000008961 swelling Effects 0.000 claims description 5
- 150000001408 amides Chemical class 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229920000768 polyamine Polymers 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- NQBXSWAWVZHKBZ-UHFFFAOYSA-N 2-butoxyethyl acetate Chemical compound CCCCOCCOC(C)=O NQBXSWAWVZHKBZ-UHFFFAOYSA-N 0.000 claims description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 2
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000002480 mineral oil Substances 0.000 claims description 2
- 235000010446 mineral oil Nutrition 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 1
- 229920003009 polyurethane dispersion Polymers 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract description 22
- 238000005498 polishing Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 16
- 239000000047 product Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000006184 cosolvent Substances 0.000 description 6
- 238000005187 foaming Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- 241001448624 Miliaria Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 230000033764 rhythmic process Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 2
- 206010027627 Miliaria Diseases 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 201000004169 miliaria rubra Diseases 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000001038 titanium pigment Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group 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 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 239000002482 conductive additive Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000009503 electrostatic coating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- KWLMIXQRALPRBC-UHFFFAOYSA-L hectorite Chemical group [Li+].[OH-].[OH-].[Na+].[Mg+2].O1[Si]2([O-])O[Si]1([O-])O[Si]([O-])(O1)O[Si]1([O-])O2 KWLMIXQRALPRBC-UHFFFAOYSA-L 0.000 description 1
- 229910000271 hectorite Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- -1 polydimethoxysiloxane Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 239000006254 rheological additive Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention belongs to the field of coatings and automatic coating, and relates to a water-based two-component polyurethane primer surfacer which can be suitable for electrostatic spraying and can be used for thick coating, and a preparation method thereof. The primer surfacer is composed of a component A containing water-borne acrylic polyurethane resin and a component B containing hydrophilic aliphatic polyisocyanate according to the mass ratio of 4-6:1, wherein the component A contains water-borne acrylic polyurethane dispersoid accounting for 40-50 parts of the mass of the component A, propylene glycol methyl ether accounting for 3-6 parts of the mass of the component A, a conductive regulator accounting for 0.2-0.5 part of the mass of the component A and a thickening agent accounting for 0.1-0.5 part of the mass of the component A; the component B contains 60-90 parts of hydrophilic aliphatic polyisocyanate curing agent and 10-40 parts of propylene glycol monomethyl ether acetate diluent. When the paint prepared by the invention is used, a paint film has the characteristics of quick drying, weather resistance, easy polishing, high binding force for starting and stopping and the like of the waterborne acrylic polyurethane resin used as a middle paint.
Description
Technical Field
The invention belongs to the field of coatings and automatic coating, and relates to a water-based two-component polyurethane primer surfacer which can be suitable for electrostatic spraying and can be used for thick coating, and a preparation method thereof.
Background
With the continuous development of economic society and the continuous deepening of energy-saving and environment-friendly policies, the coating mode of changing oil into water is gradually implemented in the coating fields of rail transit, public buses and the like. Meanwhile, the coating spraying belongs to toxic and harmful operation, so that the electrostatic spraying is gradually replacing manual spraying, the production rhythm can be accelerated, the yield can be improved, and certain challenge is provided for the aqueous low-temperature baking finish capable of being electrostatically sprayed.
The requirements of partial rail transit and public transportation bus production workshops on necessary conditions in production, namely water-based coating, electrostatic spraying, and the requirement of meeting the required film thickness, and the requirement of short-time leveling in a drying room at 60 ℃ or 80 ℃ to ensure that the appearance of a paint film has no appearance paint diseases such as pinholes, miliaria, bubbles and the like.
Disclosure of Invention
In order to meet the above requirements, the present invention provides a water-based two-component polyurethane primer surfacer suitable for electrostatic spraying and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the water-based two-component polyurethane middle coating suitable for electrostatic spraying is composed of a component A containing water-based acrylic polyurethane resin and a component B containing hydrophilic aliphatic polyisocyanate according to a mass ratio of 4-6:1, wherein:
the component A contains 40-50 parts of aqueous acrylic polyurethane dispersoid, 3-6 parts of propylene glycol methyl ether, 0.2-0.5 part of conductive regulator and 0.1-0.5 part of thickening agent;
the component B contains 60-90 parts of hydrophilic aliphatic polyisocyanate curing agent and 10-40 parts of propylene glycol monomethyl ether acetate diluent.
The component A comprises, by mass, 40-50 parts of a water-based acrylic polyurethane dispersoid, 2-10 parts of pure water, 15-25 parts of titanium dioxide, 0.01-0.05 part of carbon black, 6-11 parts of precipitated barium, 6-11 parts of talcum powder, 0.1-0.3 part of white carbon black, 0.8-1.5 parts of a dispersing agent, 0.2-1 part of an antifoaming agent, 0.2-1 part of a flatting agent, 0.2-0.5 part of a conductive regulator, 0.1-0.5 part of a thickening agent, 0.2-0.5 part of a multifunctional additive and 3-6 parts of propylene glycol monomethyl ether.
One or more of the hydroxyl values of the aqueous hydroxyl acrylic dispersion is 2.6-4.2%;
the thickener is one or more of alkali swelling thickener, nonionic associative thickener and modified polymer clay thickener. Wherein the alkali swelling thickener is a common alkali swelling thickener prepared by copolymerizing methacrylic acid and ethyl acrylate, and an alkali swelling thickener with associated monomers; the nonionic associative thickener is polyether polyurethane (PEPU) or polyether polyol (PEPO); the modified polymer clay thickener is hectorite or montmorillonite; preferably, the nonionic associative thickener is compounded and used according to different high and low shearing forces.
The defoaming agent is one or more of polyether siloxane defoaming agent and mineral oil; the silicon-free defoaming agent is polyether, amide, hydrocarbon and the like. The polyorganosiloxane defoaming agent is polydimethoxysiloxane and the like.
The dispersant is one or more of polycarboxylic acid polymer, acid group-containing copolymer alkanol acid salt, polyamine amide and acid polyester salt; wherein the polycarboxylic acid polymer is polypropylenic acid, poly 1,6-adipic acid and the like. The acid group-containing copolymer alkanol acid salt is sodium polymethacrylate and the like. The polyamine amide and the acid polyester salt are salts formed by polymerizing carboxylic acid containing amide groups and alcohols;
the leveling agent is one or more of fluorine modified polyacrylate and modified organic siloxane. Wherein, the modified organic siloxane is obtained by grafting alcohol ether groups on the side chain of the organic siloxane, and the material is a commercial product such as TEGO 425 won't be created in Germany.
The average grain diameter (D50) of the titanium dioxide is less than or equal to 0.36 mu m; the average grain diameter (D50) of the carbon black is less than or equal to 24nm; the average grain diameter (D50) of the precipitated barium is less than or equal to 10 mu m; the average grain diameter of the talcum powder is less than or equal to 10 mu m; the average grain diameter of the white carbon black is less than or equal to 16nm.
The curing agent is aliphatic polyisocyanate, and the aliphatic polyisocyanate is one or more of hexamethylene diisocyanate, dicyclohexylmethane diisocyanate and isophorone diisocyanate; the diluent is propylene glycol methyl ether acetate and/or ethylene glycol butyl ether acetate.
A preparation method of water-based bi-component polyurethane middle coating paint suitable for electrostatic spraying,
(1) Preparation of component A: adding the aqueous hydroxyl acrylic acid dispersoid, pure water, the dispersant, the defoamer, propylene glycol methyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn according to the proportion of 500rpm while stirring, then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence under the condition of 500rpm while stirring, lifting to 1000rpm, stirring for 30min, blending to obtain the viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling.
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling.
(5) Mixing the blended component A and the blended component B according to the mass ratio of 4-6: 1, uniformly mixing to obtain the target product.
Application of water-based two-component polyurethane floating coat paint suitable for electrostatic spraying in water-based automatic coating workshops of rail transit or public buses in an electrostatic spraying manner
The invention has the beneficial effects that:
the water-based acrylic polyurethane resin is used as a film forming agent, and is matched with a specific pigment, a specific filler and an auxiliary agent, the prepared coating is used in combination with an isocyanate curing agent diluted by a specific solvent, and a paint film has the characteristics of quick drying, weather resistance, easy polishing, high binding force for starting and stopping and the like when the water-based acrylic polyurethane resin is used as a middle coating. Meanwhile, the paint disclosed by the invention is not only suitable for common water-based paint spraying operation, but also meets the automatic painting of electrostatic spraying through reasonable matching, and can achieve the high appearance effect that prickly heat cannot be generated in the thick paint with the thickness of more than 80 micrometers and no obvious orange peel under the condition of leveling for 30 minutes and forced drying at 80 ℃, thereby providing powerful help for the high appearance and production rhythm of the sprayed composite coating in the field of automatic painting; further, the following steps are carried out:
1. the water-based two-component polyurethane middle coating adopts a dispersion with the hydroxyl content in the range of 2.6-2.8%, and is matched with a cosolvent in a specific boiling point range to establish the optimal volatilization gradient, the electrostatic regulator and the proper high-low shear thickening agent to be matched with each other, so that the water-based two-component polyurethane middle coating can meet the requirement of high appearance of a film after forced drying of electrostatic spraying, and the prepared water-based two-component middle coating has the advantages of adjustable drying speed, good weather resistance, high hardness, easiness in polishing, good flexibility and capability of ensuring the initiated adhesive force.
2. Compared with the common water-based bi-component acrylic polyurethane coating, the invention not only can be suitable for the common manual coating mode, but also can be widely used in the aspect of electrostatic coating because the special conductive additive is added and the resistance range is adjustable, and the coating has good coating appearance under the action of high and low shearing force through the special rheological additive.
3. In practical application, a relatively fast production rhythm is often pursued, after spraying, the polyurethane paint is forced to be baked at 60-80 ℃ for about 30min after leveling and enters a drying chamber, and the forced baking is widely adopted to replace relatively slow natural drying, and generally, the water-based double-component polyurethane paint is easy to cause paint diseases such as pinholes, miliaria, bubbles and the like under the condition. The waterborne two-component polyurethane middle coating disclosed by the invention can meet the requirements of 30min leveling time and 30min forced baking at 80 ℃ after optimal matching of the cosolvent through reasonable hydroxyl content selection, and has normal appearance with the size of below 80 mu m, no pinholes, no miliaria, no foaming and other common paint diseases. Namely, the normalization of the appearance of the thick coating can be met under the conditions of short-time leveling and forced drying.
Detailed Description
The following examples are presented to further illustrate embodiments of the present invention, and it should be understood that the embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the invention.
The following examples are all capable of achieving the experimental results claimed in this patent.
The invention takes the waterborne acrylic polyurethane resin as a film forming agent, and is matched with specific pigment, filler and auxiliary agent, the prepared coating is combined with the hydrophilic aliphatic polyisocyanate curing agent diluted by a specific solvent to be used together according to a specified proportion, and a paint film has the characteristics of quick drying, weather resistance, easy polishing, starting and stopping binding force and the like of the waterborne acrylic polyurethane resin used as a floating coat. Meanwhile, the paint is suitable for common water-based paint spraying operation, meets the automatic coating of electrostatic spraying through reasonable matching, can achieve the high-appearance effect that a dry film with the thickness of more than 80 mu m does not generate miliaria and has no obvious orange peel under the condition of leveling for 30 minutes and forced drying at 80 ℃, and provides powerful help for spraying a high-appearance water-based paint composite coating (primer, middle coating and finish paint) in the field of automatic coating and improving the production tact.
Example 1
The preparation method of the medium paint comprises the following steps of:
(1) Preparation of component A: adding the aqueous hydroxy acrylic acid dispersoid (Dismann XK-110), pure water, dispersant (BYK-2012), defoamer (BYK 024), propylene glycol monomethyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn under the condition of 500rpm, then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain the target product.
Example 2
The preparation method of the primer surfacer comprises the following steps of:
(1) Preparation of component A: stirring at 500rpm while sequentially adding aqueous hydroxy acrylic acid dispersoid (Junneng D27S-23), pure water, dispersant (BYK-2055), defoamer (BYK 011), propylene glycol monomethyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black, and then lifting to 1000rpm for stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional assistant and a thickening agent in sequence under the condition of 500rpm while stirring, lifting to 1000rpm, stirring for 30min, blending to the viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain the target product.
Example 3
The preparation method of the medium paint comprises the following steps of:
(1) Preparation of component A: adding the aqueous hydroxy acrylic acid dispersoid (HD-8426 trained in Shanghai province) under the condition of 500rpm, pure water, dispersing agent (Tego-757W), defoaming agent (Tego 810), propylene glycol monomethyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn while stirring, and then lifting to 1000rpm to stir for 30min;
(2) The mixture is moved to sand mill and ground until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain the target product.
TABLE 1
Comparative example 1
The preparation method of the primer surfacer comprises the following steps of:
(1) Preparation of the component A: adding the aqueous hydroxy acrylic acid dispersoid (Corsimona A145), pure water, dispersant (BYK-2012), defoamer, (BYK 024), propylene glycol methyl ether, titanium pigment, carbon black, precipitated barium, talcum powder and white carbon black in turn under the condition of 500rpm, then lifting to 1000rpm and stirring for 30min;
(2) The mixture is moved to sand mill and ground until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding the hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering by a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the component B according to the mass ratio of 5:1, uniformly mixing to obtain the target product.
Comparative example 2
The preparation method of the medium paint comprises the following steps of:
(1) Preparation of the component A: adding the aqueous hydroxyl acrylic acid dispersoid (Corceva A2427), pure water, the dispersant (BYK-2012), the defoamer, (BYK 024), propylene glycol monomethyl ether, titanium pigment, carbon black, precipitated barium, talcum powder and white carbon black in sequence under the condition of 500rpm, then lifting to 1000rpm and stirring for 30min;
(2) The mixture is moved to sand mill and ground until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain a target product.
Comparative example 3
The preparation method of the medium paint comprises the following steps of:
(1) Preparation of component A: adding the aqueous hydroxyl acrylic acid dispersoid (Dismann XK-110), pure water, dispersant (BYK-2012), defoamer (BYK 024), propylene glycol methyl ether acetate, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn under the condition of 500rpm, then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain a target product.
Comparative example 4
The preparation method of the medium paint comprises the following steps of:
(1) Preparation of component A: adding the aqueous hydroxy acrylic acid dispersoid (Dismann XK-110), pure water, dispersant (BYK-2012), defoamer (BYK 024), ethylene glycol monobutyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn under the condition of 500rpm, then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate with the standard amount under the condition of 500rpm, dispersing for 30min, filtering by a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain the target product.
Comparative example 5
The preparation method of the medium paint comprises the following steps of:
(1) Preparation of component A: adding the aqueous hydroxy acrylic acid dispersoid (Dismann XK-110), pure water, dispersant (BYK-2012), defoamer (BYK 024), propylene glycol monomethyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn under the condition of 500rpm, then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain the target product.
Comparative example 6
The preparation method of the medium paint comprises the following steps of:
(1) Preparation of component A: adding the aqueous hydroxy acrylic acid dispersoid (Dismann XK-110), pure water, dispersant (BYK-2012), defoamer (BYK 024), propylene glycol monomethyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn under the condition of 500rpm, then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a multifunctional auxiliary agent and a thickening agent (tego 3060 and tego 3000) of the same type in turn under the condition of 500rpm, stirring for 30min at 1000rpm until the viscosity is 90 +/-5 KU (25 ℃), filtering and filling by using the 150-mesh filter screen;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) Mixing the blended component A and the blended component B according to the mass ratio of 5:1, uniformly mixing to obtain the target product.
TABLE 2
The performance tests of the waterborne two-component acrylic polyurethane middle coat paint obtained in the above examples and comparison are detailed in tables 3 and 4.
TABLE 3 Performance index
TABLE 4 Performance index
As can be seen from the performance indexes, the hydroxyl content of the three different grades of aqueous hydroxy acrylic acid dispersoids in examples 1, 2 and 3 is respectively 2.6 percent, 2.7 percent and 2.8 percent; the dispersion with the hydroxyl content in the range is matched with four factors of cosolvent propylene glycol methyl ether, a conductive regulator and a proper high-low shear thickening agent (Hamins 299 and 350D), so that the electrostatic spray dry film with the dry film appearance of less than 70 mu m is normal under the process condition of forced drying at 80 ℃ for 30min after 30min of leveling, and the performance indexes of all aspects meet the requirements of Q/CR546.1 Table 3.
Comparative example 1 and comparative example 2 are kosteine a145 with a hydroxyl group content of 3.3% and kosteine a2427 with a hydroxyl group content of 2.0%, respectively, which is higher or lower than the interval of example 2.6-2.8%. The performance result shows that the comparative example 1 has high hydroxyl content, incomplete crosslinking within limited forced drying time, unqualified butanone wiping resistance and slow surface drying and solid drying; comparative example 2 has a low hydroxyl group content, and although drying becomes fast, under forced drying conditions, the paint film is closed too fast, the internal solvent does not reach the volatilization, and severe foaming phenomenon occurs at more than 40 μm, resulting in poor appearance.
Comparative example 3 and comparative example 4 are respectively a common aqueous cosolvent with the boiling point higher than propylene glycol methyl ether, the propylene glycol methyl ether is taken as the cosolvent in the example, forced drying is not influenced in the intermediate coating with the boiling point of 118 ℃, and the thickness of a foaming film can reach more than 70 mu m; in comparative example 3, the same amount of propylene glycol monomethyl ether acetate is adopted, the boiling point is 154 ℃, the test result is that the foaming is serious and the volatilization is slow, part of the foaming cannot escape in time after the film is formed, and the film generates foaming; comparative example 4 used an equivalent amount of ethylene glycol butyl ether and had a boiling point of 171 c, and the test results were that over 45 μm foamed severely, volatilized more slowly, and foamed more easily under forced drying conditions.
Compared with the prior art, the conductive regulator is not added in the comparative example 5, so that the resistance of the water-based paint does not reach the ideal working condition of electrostatic spraying, the paint mist is not dispersed and gathered, the film forming effect is poor, and sometimes even the alarm is stopped when the pressure is abnormal.
Although the comparative example 6 replaces two kinds of high-low shear thickening agents with the same amount, the rheological effect is greatly different from that of the examples, the appearance of a paint film is obviously uneven, and the whole orange peel is heavier.
In conclusion, only the aqueous hydroxyl acrylic acid dispersoid with the hydroxyl content of 2.6-2.8 percent is adopted, and the propylene glycol methyl ether cosolvent, the electrostatic regulator and the proper high-low shear thickening agent (Haimines 299 and 350D) are matched with each other, so that the aqueous hydroxyl acrylic acid dispersoid can meet the requirement of high appearance of a film after forced drying of electrostatic spraying, and the requirement is absent, so that the aqueous bi-component acrylic acid polyurethane intermediate coat can adapt to large-scale automatic coating lines such as rail transit, buses and the like, the production tact is improved to the maximum extent, the coating efficiency is improved with quality and quantity guaranteed, the common coating defects of the aqueous paint after the implementation of the environmental protection policy of 'changing oil into water' are counteracted to the maximum extent, and related problems such as poor adaptability of electrostatic spraying equipment and serious orange peel of the paint film caused by poor atomization, reduced production tact caused by slow drying, and serious appearance of the paint film caused by forced drying in a short time after finishing prickly heat coating are solved.
Claims (8)
1. A waterborne two-component polyurethane primer surfacer suitable for electrostatic spraying is characterized in that: the intermediate coating is composed of a component A containing water-borne acrylic polyurethane resin and a component B containing hydrophilic aliphatic polyisocyanate according to the mass ratio of 4-6:1, wherein:
the component A contains 40-50 parts of aqueous acrylic polyurethane dispersoid, 3-6 parts of propylene glycol methyl ether, 0.2-0.5 part of conductive regulator and 0.1-0.5 part of thickening agent;
the component B contains 60-90 parts of hydrophilic aliphatic polyisocyanate curing agent and 10-40 parts of propylene glycol monomethyl ether acetate diluent.
2. The waterborne two-component polyurethane mid-coat paint suitable for electrostatic spraying according to claim 1, wherein: the component A comprises, by mass, 40-50 parts of an aqueous acrylic polyurethane dispersion, 2-10 parts of pure water, 15-25 parts of titanium dioxide, 0.01-0.05 part of carbon black, 6-11 parts of precipitated barium, 6-11 parts of talcum powder, 0.1-0.3 part of white carbon black, 0.8-1.5 parts of a dispersing agent, 0.2-1 part of a defoaming agent, 0.2-1 part of a leveling agent, 0.2-0.5 part of a conductive regulator, 0.1-0.5 part of a thickening agent, 0.2-0.5 part of a multifunctional additive and 3-6 parts of propylene glycol methyl ether.
3. The waterborne two-component polyurethane mid-coat paint suitable for electrostatic spraying according to claim 1, wherein: one or more of the hydroxyl values of the aqueous hydroxyl acrylic dispersion is 2.6-4.2%; the thickener is one or more of alkali swelling thickener, nonionic associative thickener and modified polymer clay thickener.
4. The waterborne two-component polyurethane mid-coat paint suitable for electrostatic spraying according to claim 2, wherein: the defoaming agent is one or more of polyether siloxane defoaming agent and mineral oil;
the dispersant is one or more of polycarboxylic acid polymer, acid group-containing copolymer alkanol acid salt, polyamine amide and acid polyester salt;
the leveling agent is one or more of fluorine modified polyacrylate and modified organic siloxane.
5. The waterborne two-component polyurethane mid-coat paint suitable for electrostatic spraying according to claim 1, wherein: the average particle size (D50) of the titanium dioxide is less than or equal to 0.36 mu m; the average grain diameter (D50) of the carbon black is less than or equal to 24nm; the average grain diameter (D50) of the precipitated barium is less than or equal to 10 mu m; the average grain diameter of the talcum powder is less than or equal to 10 mu m; the average grain diameter of the white carbon black is less than or equal to 16nm.
6. The waterborne two-component polyurethane mid-coat paint suitable for electrostatic spraying according to claim 1, wherein: the curing agent is hydrophilic aliphatic polyisocyanate, and the aliphatic polyisocyanate is one or more of hexamethylene diisocyanate, dicyclohexylmethane diisocyanate and isophorone diisocyanate; the diluent is propylene glycol methyl ether acetate and/or ethylene glycol butyl ether acetate.
7. A process for the preparation of the aqueous two-component polyurethane intercoat paint systems suitable for electrostatic spraying according to claim 1,
(1) Preparation of component A: adding the aqueous hydroxyl acrylic acid dispersoid, pure water, the dispersant, the defoamer, propylene glycol methyl ether, titanium dioxide, carbon black, precipitated barium, talcum powder and white carbon black in turn according to the proportion of 500rpm while stirring, then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand mill, and grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by using a 150-mesh filter screen, adding a flatting agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent in sequence while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to obtain a viscosity of 90 +/-5 KU (25 ℃), filtering by using the 150-mesh filter screen, and filling;
(4) Preparation of the component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, starting stirring, adding propylene glycol monomethyl ether acetate of the standard amount while stirring at 500rpm, dispersing for 30min, filtering with a 150-mesh filter screen, and filling;
(5) And uniformly mixing the blended component A and the blended component B according to the mass of 4-6:1 to obtain the target product.
8. The use of the aqueous two-component polyurethane intercoat paint suitable for electrostatic spraying according to claim 1, wherein the aqueous two-component polyurethane intercoat paint according to claim 1 is used in an aqueous automated paint shop for rail transit or public buses by electrostatic spraying.
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