CN115678397B - Water-based double-component polyurethane intermediate coat suitable for electrostatic spraying - Google Patents
Water-based double-component polyurethane intermediate coat suitable for electrostatic spraying Download PDFInfo
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- CN115678397B CN115678397B CN202110856464.2A CN202110856464A CN115678397B CN 115678397 B CN115678397 B CN 115678397B CN 202110856464 A CN202110856464 A CN 202110856464A CN 115678397 B CN115678397 B CN 115678397B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000007590 electrostatic spraying Methods 0.000 title claims abstract description 25
- 239000004814 polyurethane Substances 0.000 title claims abstract description 25
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 25
- 239000003973 paint Substances 0.000 claims abstract description 49
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 36
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 238000002360 preparation method Methods 0.000 claims abstract description 36
- 239000002562 thickening agent Substances 0.000 claims abstract description 31
- 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
- 239000003085 diluting agent Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 67
- 238000001914 filtration Methods 0.000 claims description 33
- 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
- 238000002156 mixing Methods 0.000 claims description 25
- 238000011049 filling Methods 0.000 claims description 22
- FEWFXBUNENSNBQ-UHFFFAOYSA-N 2-hydroxyacrylic acid Chemical compound OC(=C)C(O)=O FEWFXBUNENSNBQ-UHFFFAOYSA-N 0.000 claims description 16
- 239000012752 auxiliary agent Substances 0.000 claims description 16
- 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
- 239000013530 defoamer Substances 0.000 claims description 13
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 11
- 238000000227 grinding Methods 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
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 7
- 239000001038 titanium pigment Substances 0.000 claims description 7
- 239000002518 antifoaming agent Substances 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 150000001408 amides Chemical class 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- -1 alkyl oleate Chemical compound 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229940049964 oleate Drugs 0.000 claims description 3
- 229920000768 polyamine Polymers 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000004408 titanium dioxide Substances 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
- 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
- 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
- 238000001035 drying Methods 0.000 abstract description 21
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 13
- 229920005749 polyurethane resin Polymers 0.000 abstract description 7
- 238000005498 polishing Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000047 product Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000005507 spraying Methods 0.000 description 7
- 235000010215 titanium dioxide Nutrition 0.000 description 7
- 239000006184 cosolvent Substances 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- 238000005187 foaming Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 206010027627 Miliaria Diseases 0.000 description 3
- 241001448624 Miliaria Species 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 201000004169 miliaria rubra Diseases 0.000 description 3
- 125000005375 organosiloxane group Chemical group 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
- 239000004927 clay Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000011527 polyurethane coating Substances 0.000 description 2
- 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
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive 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
- 239000003513 alkali Substances 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013065 commercial product 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
- 239000006260 foam Substances 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
- 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
- 239000003921 oil Substances 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
- 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
- 229920003009 polyurethane dispersion Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000008961 swelling Effects 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 fields of paint and automatic coating, and relates to a water-based two-component polyurethane intermediate coat which can be applied to electrostatic spraying and thick coating and a preparation method thereof. The middle paint consists of an A component containing aqueous acrylic polyurethane resin and a B component containing hydrophilic aliphatic polyisocyanate according to a mass ratio of 4-6:1, wherein the A component contains 40-50 parts by mass of aqueous acrylic polyurethane dispersoid, 3-6 parts by mass of propylene glycol methyl ether, 0.2-0.5 part by mass of conductive regulator and 0.1-0.5 part by mass of thickener; the component B contains 60-90 parts of hydrophilic aliphatic polyisocyanate curing agent and 10-40 parts of propylene glycol methyl ether acetate diluent. When the coating prepared by the invention is used, the paint film has the characteristics of quick-drying property, weather resistance, easiness in polishing, up-and-down binding force and the like of the water-based acrylic polyurethane resin used as a middle paint.
Description
Technical Field
The invention belongs to the fields of paint and automatic coating, and relates to a water-based two-component polyurethane intermediate coat which can be applied to electrostatic spraying and thick coating and a preparation method thereof.
Background
Along with the continuous development of economy and society, the energy-saving and environment-friendly policies are deepened continuously, and the coating mode conversion of 'oil to water' is gradually implemented in the coating fields of rail transit, bus bars and the like. Meanwhile, paint spraying belongs to toxic and harmful operation, so that electrostatic spraying is gradually replacing manual spraying, the production beat can be accelerated, the yield is improved, and a certain challenge is provided for low-temperature baking paint capable of being sprayed electrostatically in water.
The requirements of part of rail transit and bus production workshops on the necessary conditions in production, namely the requirements of water-based and electrostatic spraying, the film thickness required by the production needs to be met, and the film is leveled in a short time to a drying chamber 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 requirements, the invention provides an aqueous two-component polyurethane intermediate paint suitable for electrostatic spraying and a preparation method thereof.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the water-based two-component polyurethane intermediate paint suitable for electrostatic spraying comprises an A component containing water-based acrylic polyurethane resin and a B component 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 thickener;
the component B contains 60-90 parts of hydrophilic aliphatic polyisocyanate curing agent and 10-40 parts of propylene glycol methyl ether acetate diluent.
The component A comprises, by mass, 40-50 parts of aqueous acrylic polyurethane dispersion, 2-10 parts of pure water, 15-25 parts of titanium pigment, 0.01-0.05 part of carbon black, 6-11 parts of barium deposit, 6-11 parts of talcum powder, 0.1-0.3 part of white carbon black, 0.8-1.5 parts of dispersing agent, 0.2-1 part of defoaming agent, 0.2-1 part of leveling agent, 0.2-0.5 part of conductive regulator, 0.1-0.5 part of thickening agent, 0.2-0.5 part of multifunctional auxiliary agent and 3-6 parts of propylene glycol methyl ether.
One or more of the aqueous hydroxyacrylic acid dispersion hydroxyl numbers between 2.6% and 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 an association monomer; the nonionic associative thickener is polyether polyurethane (PEPU) and polyether polyol (PEPO); the modified polymer clay type thickener is hectorite and montmorillonite; preferably, the nonionic associative thickener is compounded according to different high and low shear forces.
The defoaming agent is one or more of polyether siloxane defoaming agents and mineral oil; wherein the silicon-free defoamer is polyether, amide, hydrocarbon, etc. The polyorganosiloxane defoamer is polydimethoxy siloxane, etc.
The dispersing agent is one or more of polycarboxylic acid polymer, acid group-containing copolymer alkyl oleate, polyamine amide and acid polyester salt; wherein the polycarboxylic acid polymer is polymalonic acid, poly-1, 6-adipic acid and the like. The acid group-containing copolymer alkyl oleate is sodium polymethacrylate and the like. The polyamine amide and the acidic 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 organosiloxane is obtained by grafting alcohol ether groups on the side chains of the organosiloxane, and the modified organosiloxane is a commercial product such as Germany winning TEGO 425.
The average grain diameter (D50) of the titanium white is less than or equal to 0.36 mu m; the average particle diameter (D50) of the carbon black is less than or equal to 24nm; the average particle diameter (D50) of the precipitated barium is less than or equal to 10 mu m; the average particle diameter of 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 an aqueous two-component polyurethane intermediate paint suitable for electrostatic spraying,
(1) And (3) preparation of the component A: sequentially adding the aqueous hydroxy acrylic acid dispersoid, pure water, dispersing agent, defoamer, propylene glycol methyl ether, titanium white, carbon black, precipitated barium, talcum powder and white carbon black under the condition of 500rpm according to the proportion, and then lifting to 1000rpm for stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) And (3) filtering the ground resin slurry by using a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring at 1000rpm for 30min, blending to a viscosity of 90+/-5 KU (25 ℃) and filtering and filling by using the 150-mesh filter screen.
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen.
(5) Mixing the component A and the component B according to the mass of 4-6: 1, uniformly mixing to obtain the target product.
Application of waterborne two-component polyurethane intermediate paint suitable for electrostatic spraying, wherein the application of the waterborne two-component polyurethane intermediate paint in a waterborne automatic coating workshop of rail transit or bus by adopting an electrostatic spraying mode
The invention has the beneficial effects that:
the invention uses the aqueous acrylic polyurethane resin as a film forming agent, and is matched with specific pigment filler and auxiliary agent, the prepared paint is used in combination with isocyanate curing agent diluted by specific solvent, and the paint film has the characteristics of quick drying property, weather resistance, easy polishing, up-down binding force and the like when the aqueous acrylic polyurethane resin is used as a middle paint. Meanwhile, the paint disclosed by the invention is not only suitable for common water-based paint spraying operation, but also meets the automatic coating of electrostatic spraying through reasonable collocation, can achieve the high appearance effect that prickly heat cannot be generated by thick coating with the thickness of more than 80 mu m and no obvious orange peel is generated under the condition of forced drying at the temperature of 80 ℃ in 30 minutes, and provides powerful help for the high appearance and production takt of the spraying composite coating in the field of automatic coating; further, the method comprises the following steps:
1. the aqueous two-component polyurethane intermediate paint adopts a dispersoid with the hydroxyl content of 2.6-2.8%, and is matched with a cosolvent with a specific boiling point range to establish an optimal volatilization gradient, an electrostatic regulator and a proper high-low shear thickening agent to be matched with each other, so that the aqueous two-component polyurethane intermediate paint can meet the requirement of high appearance of a film after being subjected to electrostatic spraying forced drying, and the prepared aqueous two-component intermediate paint has the advantages of adjustable drying speed, good weather resistance, high hardness, easy polishing, good flexibility and up-down adhesive force guarantee.
2. Compared with the common aqueous double-component acrylic polyurethane coating, the invention not only can be suitable for a common manual coating mode, but also can be widely used in the aspect of electrostatic coating due to the fact that the special conductive auxiliary agent is added and the resistance range is adjustable, and has good coating appearance after being acted by high and low shearing force through the special rheological auxiliary agent.
3. In practical application, a faster production beat is often pursued, forced baking at 60-80 ℃ after leveling for about 30min enters a drying chamber after spraying is widely adopted to replace relatively slower natural drying, and generally, the aqueous two-component polyurethane coating is easy to cause pinholes, miliaria, bubbles and other paint diseases under the condition. The waterborne double-component polyurethane intermediate paint disclosed by the invention has the advantages that through reasonable hydroxyl content selection and optimal matching use of the cosolvent, the paint can meet the common paint diseases such as normal appearance below 80 mu m, no pinholes, no prickly heat, no foaming and the like after forced baking for 30min at 80 ℃ for 30 min. Namely, the leveling and forced drying conditions in a short time can meet the normalization of the appearance of the thick coating.
Detailed Description
The following description of the embodiments of the present invention is further provided in connection with the accompanying examples, and it should be noted that the embodiments described herein are for the purpose of illustration and explanation only, and are not limiting of the invention.
The following examples all achieve the experimental results required by this patent.
The invention uses the aqueous acrylic polyurethane resin as a film forming agent, and is matched with specific pigment filler and auxiliary agent, the prepared paint combines the hydrophilic aliphatic polyisocyanate curing agent diluted by specific solvent to be used together according to the specified proportion, and the paint film has the characteristics of quick drying property, weather resistance, easy polishing, up-down binding force and the like when the aqueous acrylic polyurethane resin is used as a middle paint. Meanwhile, the coating is not only suitable for common water-based paint spraying operation, but also meets the automatic coating of electrostatic spraying through reasonable collocation, and can achieve the high appearance effect that the film thickness of a dry film above 80 mu m does not cause miliaria and no obvious orange peel under the condition of forced drying at the temperature of 30 minutes and 80 ℃ in a leveling way, thereby providing powerful help for the improvement of the spray coating of high-appearance water-based paint composite coating (primer, middle coating and top coating) and the production beat in the field of automatic coating.
Example 1
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Dissmann XK-110), pure water, dispersing agent (BYK-2012), defoamer (BYK 024), propylene glycol methyl ether, titanium pigment, carbon black, barium deposit, talcum powder and white carbon black in sequence under the condition of 500rpm, and then lifting to 1000rpm for stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring for 30min after lifting to 1000rpm, and filtering and filling by the 150-mesh filter screen after stirring for 30min until the viscosity is 90+/-5 KU (25 ℃);
(4) And (3) preparation of a component B: adding aliphatic polyisocyanate into a container according to a standard amount, stirring, adding the standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
Example 2
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Juneng D27S-23), pure water, dispersing agent (BYK-2055), defoamer (BYK 011), propylene glycol methyl ether, titanium white, carbon black, barium deposit, talcum powder and white carbon black in sequence while stirring at 500rpm, and then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring for 30min after lifting to 1000rpm, and filtering and filling by the 150-mesh filter screen after stirring for 30min until the viscosity is 90+/-5 KU (25 ℃);
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
Example 3
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Shanghai trained HD-8426), pure water, dispersing agent (Tego-757W), defoamer (Tego 810), propylene glycol methyl ether, titanium dioxide, carbon black, barium deposit, talcum powder and white carbon black in sequence while stirring at 500rpm, and then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring for 30min after lifting to 1000rpm, and filtering and filling by the 150-mesh filter screen after stirring for 30min until the viscosity is 90+/-5 KU (25 ℃);
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
TABLE 1
Comparative example 1
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of a component A: adding water-based hydroxyl acrylic acid dispersoid (Kogyo A145), pure water, dispersing agent (BYK-2012), defoamer (BYK 024), propylene glycol methyl ether, titanium white, carbon black, precipitated barium, talcum powder and white carbon black in sequence while stirring at 500rpm, and then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring for 30min after lifting to 1000rpm, and filtering and filling by the 150-mesh filter screen after stirring for 30min until the viscosity is 90+/-5 KU (25 ℃);
(4) And (3) preparation of a component B: adding the aliphatic polyisocyanate into a container according to the standard amount, stirring, adding the standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
Comparative example 2
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Kogyo A2427), pure water, dispersing agent (BYK-2012), defoamer, (BYK 024), propylene glycol methyl ether, titanium white, carbon black, precipitated barium, talcum powder and white carbon black in sequence while stirring at 500rpm, and then lifting to 1000rpm and stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring for 30min after lifting to 1000rpm, and filtering and filling by the 150-mesh filter screen after stirring for 30min until the viscosity is 90+/-5 KU (25 ℃);
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
Comparative example 3
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Dissmann XK-110), pure water, dispersing agent (BYK-2012), defoamer (BYK 024), propylene glycol methyl ether acetate, titanium dioxide, carbon black, barium deposit, talcum powder and white carbon black in sequence under the condition of 500rpm, and stirring for 30min after lifting to 1000 rpm;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring for 30min after lifting to 1000rpm, and filtering and filling by the 150-mesh filter screen after stirring for 30min until the viscosity is 90+/-5 KU (25 ℃);
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
Comparative example 4
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Dissmann XK-110), pure water, dispersing agent (BYK-2012), defoamer (BYK 024), ethylene glycol butyl ether, titanium pigment, carbon black, barium deposit, talcum powder and white carbon black in sequence under the condition of 500rpm, and then lifting to 1000rpm for stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring for 30min after lifting to 1000rpm, and filtering and filling by the 150-mesh filter screen after stirring for 30min until the viscosity is 90+/-5 KU (25 ℃);
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
Comparative example 5
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Dissmann XK-110), pure water, dispersing agent (BYK-2012), defoamer (BYK 024), propylene glycol methyl ether, titanium pigment, carbon black, barium deposit, talcum powder and white carbon black in sequence under the condition of 500rpm, and then lifting to 1000rpm for stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to a viscosity of 90+/-5 KU (25 ℃) and filtering and filling by a 150-mesh filter screen;
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
Comparative example 6
The preparation method of the middle coating comprises the following steps of:
(1) And (3) preparation of the component A: adding water-based hydroxyl acrylic acid dispersoid (Dissmann XK-110), pure water, dispersing agent (BYK-2012), defoamer (BYK 024), propylene glycol methyl ether, titanium pigment, carbon black, barium deposit, talcum powder and white carbon black in sequence under the condition of 500rpm, and then lifting to 1000rpm for stirring for 30min;
(2) Transferring the mixture to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a multifunctional additive and a thickening agent (tego 3060 and tego 3000) of the same type while stirring at 500rpm, lifting to 1000rpm, stirring for 30min, blending to a viscosity of 90+/-5 KU (25 ℃) and filtering and filling by a 150-mesh filter screen;
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) Mixing the component A and the component B according to the mass of 5:1, uniformly mixing to obtain the target product.
TABLE 2
The performance of the waterborne two-component acrylic polyurethane mid-coat paint obtained by comparing the above examples with that of the comparative examples is shown in tables 3 and 4.
TABLE 3 Performance index
TABLE 4 Performance index
From the performance indexes, the hydroxyl content of the three aqueous hydroxyl acrylic dispersions with different brands in examples 1, 2 and 3 is 2.6%, 2.7% and 2.8% respectively; the dispersion with the hydroxyl content is matched with four elements of cosolvent propylene glycol methyl ether, conductive regulator and proper high-low shear thickening agent (Haimines 299 and 350D), so that the dry film with the particle size of less than 70 mu m has normal appearance under the process condition of forced drying at 80 ℃ for 30min after 30min leveling, and the performance indexes in all aspects meet the requirements of Q/CR546.1 in Table 3.
Comparative example 1 and comparative example 2 were respectively the region of 3.3% hydroxyl content of ColorSichuang A145 and 2.0% of ColorSichuang A2427, higher or lower than examples 2.6-2.8%. The performance results show that the comparative example 1 has high hydroxyl content, incomplete crosslinking in a limited forced drying time, poor butanone wiping resistance and slower surface drying; comparative example 2 has low hydroxyl content, and although drying is fast, under forced drying conditions, the paint film is too fast to be sealed, the internal solvent is not volatilized out, and serious foaming phenomenon is generated above 40 mu m, and the appearance is bad.
The common aqueous cosolvent with the boiling point higher than that of propylene glycol methyl ether is respectively used in comparative example 3 and comparative example 4, the propylene glycol methyl ether is used as the cosolvent, forced drying is not affected in the middle paint with the boiling point of 118 ℃, and the foaming film thickness can reach more than 70 mu m; in comparative example 3, propylene glycol methyl ether acetate with the same amount is adopted, the boiling point is 154 ℃, the test result is that the foam is seriously foamed with more than 55 mu m, the volatilization is slow, part of the film is not escaped after the film is formed, and the film is foamed; comparative example 4 employed an equivalent amount of butyl cellosolve with a boiling point of 171 c and a severe foaming of 45 μm or more as a result of the test, the volatilization was slower and the foaming was easier under forced drying conditions.
In comparative example 5, no conductive regulator is added, so that the resistance of the water paint does not reach the ideal working condition of electrostatic spraying, paint mist is not gathered after being dispersed, the film forming effect is poor, and sometimes even the pressure is abnormal, the alarm is stopped.
In comparative example 6, although two types of high-low shear thickeners are replaced by equal amounts, the rheological effect is greatly different from that of the examples, the appearance of a paint film is obviously uneven, and the integral orange peel is heavy.
In summary, only the aqueous hydroxy acrylic dispersion with the hydroxyl content of 2.6-2.8% is adopted, and propylene glycol methyl ether cosolvent, electrostatic regulator and proper high-low shear thickener (Haimines 299 and 350D) are matched with each other, so that the aqueous hydroxy acrylic dispersion can meet the requirement of high appearance of a film after forced drying by electrostatic spraying, and the aqueous two-component acrylic polyurethane intermediate coating can be suitable for large-scale automatic coating lines such as rail transit, bus bars and the like, the production beat is improved to the maximum extent, the coating efficiency is improved to the maximum extent, the common coating defect of aqueous paint caused by the implementation of the environment-friendly policy of 'oil-to-water' is offset to the maximum extent, such as poor adaptability of electrostatic spraying equipment, serious orange peel of a paint film caused by poor atomization, production drop caused by slow drying, serious prickly heat appearance of the paint film caused by forced drying in a short time after the coating is finished, and the like.
Claims (7)
1. An aqueous two-component polyurethane mid-coat paint suitable for electrostatic spraying, characterized in that: the middle paint is composed of an A component containing aqueous hydroxyl acrylic acid dispersoid and a B component containing hydrophilic aliphatic polyisocyanate according to the mass ratio of 4-6:1, wherein:
the component A contains 40-50 parts of aqueous hydroxy acrylic acid dispersoid, 3-6 parts of propylene glycol methyl ether, 0.2-0.5 part of conductive regulator and 0.1-0.5 part of thickener;
the component B contains 60-90 parts of hydrophilic aliphatic polyisocyanate curing agent and 10-40 parts of propylene glycol methyl ether acetate diluent;
one or more of the aqueous hydroxyacrylic acid dispersion hydroxyl numbers between 2.6% and 4.2%;
the thickener is Haimin 299 and Haimin 350D.
2. An aqueous two-component polyurethane intermediate paint suitable for electrostatic spraying as claimed in claim 1, wherein: the component A comprises, by mass, 40-50 parts of aqueous hydroxy acrylic acid dispersion, 2-10 parts of pure water, 15-25 parts of titanium pigment, 0.01-0.05 part of carbon black, 6-11 parts of barium deposit, 6-11 parts of talcum powder, 0.1-0.3 part of white carbon black, 0.8-1.5 parts of dispersing agent, 0.2-1 part of defoaming agent, 0.2-1 part of leveling agent, 0.2-0.5 part of conductive regulator, 0.1-0.5 part of thickener, 0.2-0.5 part of multifunctional auxiliary agent and 3-6 parts of propylene glycol methyl ether.
3. An aqueous two-component polyurethane intermediate paint suitable for electrostatic spraying as claimed in claim 2, wherein: the defoaming agent is one or more of polyether siloxane defoaming agents and mineral oil;
the dispersing agent is one or more of polycarboxylic acid polymer, acid group-containing copolymer alkyl oleate, polyamine amide and acid polyester salt;
the leveling agent is one or more of fluorine modified polyacrylate and modified organic siloxane.
4. An aqueous two-component polyurethane intermediate paint suitable for electrostatic spraying as claimed in claim 2, wherein: the average particle diameter D50 of the titanium dioxide is less than or equal to 0.36 mu m; the average particle diameter D50 of the carbon black is less than or equal to 24nm; the average particle diameter D50 of the precipitated barium is less than or equal to 10 mu m; the average particle diameter of 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.
5. An aqueous two-component polyurethane intermediate paint suitable for electrostatic spraying as claimed in 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.
6. A process for the preparation of an aqueous two-component polyurethane mid-coat paint suitable for electrostatic spraying as claimed in claim 1,
(1) And (3) preparation of the component A: sequentially adding the aqueous hydroxy acrylic acid dispersoid, pure water, dispersing agent, defoamer, propylene glycol methyl ether, titanium pigment, carbon black, precipitated barium, talcum powder and white carbon black under the condition of stirring at a ratio of 500rpm, and then lifting to 1000rpm for stirring for 30min;
(2) The mixture is moved to sand grinding until the fineness is less than or equal to 10 mu m;
(3) Filtering the ground resin slurry by a 150-mesh filter screen, sequentially adding a leveling agent, a conductive regulator, a multifunctional auxiliary agent and a thickening agent while stirring at 500rpm, stirring at 1000rpm for 30min, blending to a viscosity of 90+/-5 KU at 25 ℃, and filtering and filling by the 150-mesh filter screen;
(4) And (3) preparation of a component B: adding hydrophilic aliphatic polyisocyanate into a container according to a standard amount, stirring, adding a standard amount of propylene glycol methyl ether acetate while stirring at 500rpm, dispersing for 30min, and filtering and filling with a 150-mesh filter screen;
(5) And uniformly mixing the blended component A and component B according to the mass of 4-6:1 to obtain the target product.
7. The application of the aqueous two-component polyurethane mid-coat paint suitable for electrostatic spraying as claimed in claim 1, wherein the application of the aqueous two-component polyurethane mid-coat paint in an aqueous automatic coating shop of rail transit or bus is realized by adopting an electrostatic spraying mode.
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