CN112574660A - Water-based wet-spraying paint for bullet trains and preparation method thereof - Google Patents
Water-based wet-spraying paint for bullet trains and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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Abstract
The invention discloses a water-based wet-spraying paint for a motor car, which comprises a water-based polyurethane base paint and a water-based polyurethane varnish, wherein water-based hydroxy acrylic resin and aliphatic polyisocyanate are used as film forming substances, and the water-based hydroxy acrylic resin is synthesized by taking a water-based monomer, an oily monomer and a super-hydrophobic monomer as synthetic monomers. The preparation method comprises the step of uniformly mixing the raw materials according to the proportion of the formula of each component to obtain the water-based wettable spraying wet paint. The invention adopts the water-based hydroxyl propyl which takes water-based monomers, oily monomers and super-hydrophobic monomers as main synthetic monomersThe olefine acid resin is used as a main film forming material to ensure that moisture and a solvent in a dry wet film are quickly transferred to the surface to be volatilized, and simultaneously CO generated by a curing reaction is supplied2Enough time is used for transferring the surface of the paint film to release, thereby achieving the effect of prolonging the opening time of the paint film.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a water-based wet-spraying high-decoration coating for a bullet train and a preparation method thereof.
Background
At present, most of water-based wet spraying paint systems are matched with water-based bi-component epoxy primer and water-based bi-component polyurethane finish paint, and the water-based wet spraying paint systems are mainly applied to the field of corrosion prevention of a plurality of workpieces and can well meet the general requirements of the field of water-based industrial paints. In the water-based industrial coating system, the application of preparing the water-based polyurethane paint by taking the water-based hydroxyl acrylic resin as a main body is wider. The water-based polyurethane paint has better flexibility and weather resistance, but after the two components are stirred and mixed, the water-based acrylic polyurethane paint has much higher risk of generating paint film defects such as dark bubbles, pinholes, miliaria and the like in the drying process than solvent-based polyurethane paint, is in water environment, and is more obviously influenced by relative humidity when being dried. In addition, in the aqueous two-component coating, the isocyanate curing agent reacts with the hydroxyl-containing resin and also reacts with water to generate carbon dioxide, and the carbon dioxide gas is not smoothly escaped when the coating is thick, so that the problems of miliaria and the like are easily caused.
For some high-end equipment, the coated object is larger like a harmonious motor car body, large-area spraying is needed, the coating is required to have high decoration and high weather resistance, and a wet spraying process of the waterborne polyurethane base color paint and the waterborne polyurethane varnish is not solved at present. When the vehicle body is sprayed in a large area, in order to improve the construction efficiency, a high-pressure airless spraying mode or a diaphragm pump spraying mode is usually adopted, the two modes are easy to coat thickly, water molecules are difficult to volatilize due to thick coating, and the miliaria probability is increased; in addition, in order to solve the problems of high decoration and high weather resistance in large-area vehicle body coating, the adopted composite coating is a matched system of the waterborne polyurethane base color paint and the waterborne polyurethane varnish, the waterborne polyurethane base color paint needs to be baked for 2 hours at 60 ℃ after being sprayed, and the polyurethane varnish is sprayed after being cooled, but the process has two defects: firstly, the construction process is increased, and the energy consumption is wasted; and secondly, after the waterborne polyurethane base color paint is baked and dried, the waterborne polyurethane varnish is sprayed, so that the adhesion force between smooth layers of a paint film of the waterborne polyurethane base color paint is poor.
Therefore, it is important to develop a water-based wet-spraying high-decoration coating system which has good decoration, good weather resistance, high limit film thickness and good construction performance and is suitable for large-area spraying of motor train units.
Disclosure of Invention
The invention aims to solve the technical problems, overcome the defects and shortcomings in the background technology and provide the water-based wet-spraying paint which is good in decoration, good in flexibility, good in weather resistance, high in limit film thickness, low in VOC content, good in construction performance and suitable for large-area spraying of the motor train unit and the preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a waterborne wettable spraying wet coating for a bullet train comprises a waterborne polyurethane base coat and a waterborne polyurethane varnish, wherein the waterborne polyurethane base coat and the waterborne polyurethane varnish both use waterborne hydroxyl acrylic resin and aliphatic polyisocyanate as film forming substances, and the waterborne hydroxyl acrylic resin is waterborne hydroxyl acrylic resin synthesized by using a waterborne monomer, an oily monomer and a super-hydrophobic monomer as synthetic monomers.
The waterborne wet-spraying coating for the motor vehicle is preferably one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate and hydroxybutyl acrylate; the oily monomer is one or more of methyl methacrylate, butyl acrylate, isooctyl acrylate and isobornyl acrylate; the super-hydrophobic monomer is one or more of dodecyl methacrylate, octadecyl methacrylate, dodecafluoroheptyl methacrylate and octafluoropentyl methacrylate; and the super-hydrophobic monomer accounts for 10-30% of the total monomer.
In the above waterborne moisture-spray paint for motor vehicles, the solvent in the waterborne hydroxy acrylic resin is preferably a mixed solvent consisting of an alcohol ether solvent, a lipid solvent and an aromatic hydrocarbon oil solvent.
Preferably, the alcohol ether solvent comprises one or more of propylene glycol methyl ether, ethylene glycol butyl ether and propylene glycol butyl ether, and the lipid solvent comprises one or more of ethylene glycol ethyl ether acetate, propylene glycol methyl ether acetate and butyl acetate; the aromatic hydrocarbon oil solvent comprises one or more of dimethylbenzene and trimethylbenzene.
In the above aqueous wet-sprayable coating for automobiles, preferably, the solid content of the aqueous hydroxy acrylic resin is 40 to 45 percent, and the hydroxyl content is 3.0 to 3.5 percent.
In the waterborne moisture-spraying coating for the motor vehicle, preferably, the waterborne hydroxy acrylic resin is mainly prepared from the following raw materials in parts by weight:
mixing monomers: 50-60 parts of a mixed monomer, wherein the mixed monomer consists of a water-based monomer, an oily monomer and a super-hydrophobic monomer;
mixing solvent: 10-15 parts of (by weight),
initiator: 2-4 parts of initiator, wherein the initiator is one or more of benzoyl peroxide, tert-butyl peroxybenzoate, azobisisobutyronitrile and azobisisoheptonitrile;
neutralizing agent: 1-2 parts of neutralizing agent, wherein the neutralizing agent is one or more of N, N-dimethylethanolamine and AMP-95;
deionized water: 50-60 parts.
The waterborne moisture-spray wet-coating for automobiles is preferably prepared by a method comprising the following steps:
(1) mixing all the mixed monomers with 80% of initiator to obtain a mixed solution A;
(2) adding 80% of mixed solvent into a reaction kettle, starting stirring, heating to 120 ℃, then uniformly dripping the mixed solution A, finishing dripping for 4 hours, and then preserving heat at 120 ℃ for 30 min;
(3) mixing the rest mixed solvent and the rest initiator, dripping the mixture into the reactant obtained in the step (2), keeping the temperature for 3-4h after dripping is finished for 10 min;
(4) cooling to 60-70 ℃, adding a neutralizing agent, uniformly dropwise adding deionized water under the stirring and dispersing condition of 3000r/min at 2000-2 h for inverse emulsification, cooling to below 40 ℃ after dropwise adding is finished for 1.5-2h, and discharging to obtain the aqueous hydroxyl acrylic resin.
Preferably, the waterborne polyurethane base coat comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
30-60 parts by weight of water-based hydroxyl acrylic resin,
5 to 40 parts by weight of deionized water,
0.5 to 3 parts by weight of a pH regulator,
0.2 to 2 parts by weight of an anti-settling agent,
0.5 to 2 parts by weight of a dispersant,
0.1 to 1 part by weight of a defoaming agent,
5-50 parts by weight of a pigment filler,
3-8 parts of a film-forming assistant,
0.1 to 0.5 parts by weight of a base wetting agent,
0.1-1 part by weight of a thickener;
the component B comprises the following components in parts by weight:
30-50 parts of poly HDI curing agent, wherein the poly HDI curing agent is aliphatic polyisocyanate with NCO content of 18.5-19%;
20-30 parts of poly IPDI curing agent, wherein the poly IPDI curing agent is aliphatic polyisocyanate with NCO content of 11.5-12%;
10-30 parts of PGDA solvent.
In the waterborne wet-spraying paint for the motor vehicle, the mixing mass ratio of the component A and the component B of the waterborne polyurethane base paint before spraying is 6: 1.
The waterborne wet-spray coating for a motor vehicle described above, preferably, the anti-settling agent is magnesium aluminum polysilicate; further preferably SHV type poly-magnesium aluminum silicate of New mineral Material Co., Ltd, Huiyu, China, Suzhou;
the pigment filler comprises pigment and filler, and the pigment is one or more of iron oxide red, carbon black and titanium pigment; the filler is one or more of talcum powder, barium sulfate, silicon micropowder and mica powder.
Preferably, the waterborne polyurethane varnish comprises an A component and a B component, wherein the A component comprises the following components in parts by weight:
60-80 parts by weight of water-based hydroxyl acrylic resin,
5 to 40 parts by weight of deionized water,
0.5 to 3 parts by weight of a pH regulator,
0.5 to 2 parts by weight of a dispersant,
0.1 to 1 part by weight of a defoaming agent,
3-8 parts of a film-forming assistant,
0.1 to 0.5 parts by weight of a base wetting agent,
0.1-1 part by weight of a thickener;
the component B comprises the following components in parts by weight:
30-50 parts of poly HDI curing agent, wherein the poly HDI curing agent is aliphatic polyisocyanate with NCO content of 18.5-19%; further, the HDI curing agent is N3900 of Corsia chemical;
20-30 parts of poly IPDI curing agent, wherein the poly IPDI curing agent is aliphatic polyisocyanate with NCO content of 11.5-12%; further poly HDI curing agent is selected from Corui D803;
10-30 parts of PGDA solvent.
The above-mentioned aqueous wet-sprayable wet coating for automobiles is preferably such that the mass ratio of the component A and the component B uniformly mixed before spraying is 2.5: 1.
The above waterborne wet-sprayable coating for automobiles, preferably, the dispersant is a nonionic polyether acrylate polymer; further selecting a German Bick chemical dispersant BYK-190;
the pH regulator is one of ammonia water, N dimethylethanolamine, triethylamine and AMP-95; further, the pH regulator is AMP-95 from Haimax;
the defoaming agent is a silicone defoaming agent, such as 902W defoaming agent of Degussa company;
the substrate wetting agent can be selected from polyether siloxane copolymers of Degussa, such as WET270 or BYK 346;
the film-forming aid is dipropylene glycol butyl ether.
The thickener is a polyurethane thickener, and is more preferably a PUR62 thickener from German Mingling company.
As a general inventive concept, the present invention also provides a method of preparing the above-described waterborne wet-sprayable wet-coating for motor vehicles, comprising the steps of:
(1) according to the raw material ratio of the component A in the waterborne polyurethane base coat, uniformly stirring the waterborne hydroxyl acrylic resin and the pH regulator, sequentially adding deionized water, the anti-settling agent, the dispersant, the defoaming agent and the pigment filler, uniformly stirring, and grinding to the fineness of less than or equal to 10 microns; continuously adding a base material wetting agent and a thickening agent under the stirring state, adjusting the viscosity to 0.8-1.5 Pa.S, and detecting the viscosity fineness and qualified pH value to obtain a component A of the waterborne polyurethane base color paint;
(2) according to the raw material ratio of the component B in the waterborne polyurethane base coat, uniformly stirring and mixing a poly HDI curing agent, a poly IPDI curing agent and a PGDA solvent to obtain the component B of the waterborne polyurethane base coat;
(3) according to the proportion of the component A in the aqueous polyurethane varnish, uniformly stirring the aqueous hydroxyl acrylic resin and the pH regulator, sequentially adding deionized water, a dispersing agent and a defoaming agent, uniformly stirring, and grinding until the fineness is less than or equal to 10 micrometers; continuously adding a base material wetting agent and a thickening agent under the stirring state, adjusting the viscosity to 0.8-1.5 Pa.S, detecting the viscosity fineness and qualified pH value, and filtering to obtain a component A of the aqueous polyurethane varnish;
(4) and (3) according to the proportion of the component B in the aqueous polyurethane varnish, uniformly stirring and mixing the poly HDI curing agent, the poly IPDI curing agent and the PGDA solvent to obtain the component B of the aqueous polyurethane varnish.
In the preparation method, preferably, the stirring speed is 500-800 r/min,
in the preparation method, preferably, in the step (1) and the step (3), the viscosity qualified value is 0.8-1.5 Pa.S, the fineness qualified value is less than 10um, and the pH value qualified value is 7.5-8.0.
The main film forming aqueous hydroxyl acrylic resin of the aqueous wettable spraying wet coating adopts an aqueous monomer, an oily monomer and a super-hydrophobic monomer as main synthetic monomers, and a mixed solvent contains an alcohol ether solvent with strong hydrophilicity and a lipid solvent with strong oil solubility and an aromatic solvent, so that the oil and the water are compatible after reverse emulsification to form stable dispersion type resin. The oil-water compatible system of the waterborne polyurethane base paint and the paint film of the waterborne polyurethane varnish in the early drying stage can better keep the good solubility of the resin high molecular polymer, so that the viscosity of the paint film is not increased too fast, thereby ensuring that the moisture and the solvent in the wet film are rapidly transferred to the surface to be volatilized, and simultaneously providing CO generated by the curing reaction2The surface of the paint film is transferred and released for enough time, so that the effect of prolonging the opening time of the paint film is achieved; in the later drying period of the paint film, because the oily chain segment and the super-hydrophobic chain segment contained in the polymer chain segment can generate a certain 'drainage' effect, the hydrophobic chain segment is continuously concentrated in the film forming process to squeeze and transfer incompatible water to the surface for volatilization, so that water molecules are fully volatilized, and water molecules at the bottom layer are not sealed in the paint film because the surface paint film is dried too fast.
Compared with the prior art, the invention has the advantages that:
(1) the water-based wettable spraying paint disclosed by the invention adopts water-based hydroxy acrylic resin and aliphatic polyisocyanate as film forming substances, has the advantages of weather resistance and flexibility, improves the ultimate film thickness, has good construction performance and has high-gloss and high-fullness decoration.
(2) The invention adopts the water-based hydroxyl acrylic resin which takes water-based monomers, oily monomers and super-hydrophobic monomers as main synthetic monomers as a main film forming material to protectThe moisture and the solvent in the dry wet film are rapidly transferred to the surface to be volatilized, and the CO generated by the curing reaction is simultaneously given2Enough time is used for transferring the surface of the paint film to release, thereby achieving the effect of prolonging the opening time of the paint film.
(3) According to the invention, the water-based hydroxyl acrylic resin and the film-forming assistant are matched, and a proper water-based polyurethane curing agent is selected to balance the surface drying speed and the actual drying speed of the water-based polyurethane paint, so that the problem of miliaria caused by high film thickness of the water-based polyurethane paint can be well solved.
(4) The waterborne polyurethane base color paint has the advantages that the surface drying time is short, the waterborne polyurethane varnish can be sprayed after the surface is dried for 30min, the two-spraying and one-drying coating process can be realized, the energy is saved, and the construction efficiency is improved.
(5) The waterborne polyurethane base color paint and the waterborne polyurethane varnish matching system have the weather resistance of more than or equal to 1500 hours, the limit film thickness of a dry film of more than or equal to 100 mu m, and the base color paint is environment-friendly: VOC is less than or equal to 120 g/L.
(6) The waterborne polyurethane base color paint and the waterborne polyurethane varnish are matched, so that high decoration of large-area coating can be ensured, and the waterborne polyurethane base color paint has high glossiness and paint film fullness.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The raw material ratios of the A component of the aqueous polyurethane base coat and the A component of the aqueous polyurethane varnish of the following examples 1 to 3 and comparative examples 1 to 2 are shown in tables 1 and 2, respectively.
TABLE 1 raw materials for A component of aqueous polyurethane base paints in examples and comparative examples
Wherein, the dispersant in the table 1 is German Bick chemical dispersant BYK-190; the pH regulator is AMP-95 from Haimax; the anti-settling agent is selected from SHV type poly-magnesium aluminum silicate of New mineral Material Co., Ltd, Huiyu, China, Suzhou; the defoaming agent is 902W defoaming agent of Degussa company; the substrate wetting agent is polyether siloxane copolymer WET270 of Degussa company; the pigment is pigment phthalocyanine blue; the filler is barium sulfate; the thickener is PUR62 thickener from German Mingling company; the aqueous hydroxy acrylic resin in comparative examples 1-2 is 3.3% of 2033 aqueous hydroxy acrylic resin of Wanhua chemistry and 42% of solid content, and the aqueous hydroxy acrylic resin in examples 1-3 is a resin of Feilu high-tech materials, Inc. (40-45% of solid content and 3.0-3.5% of hydroxyl content), and the raw materials thereof include mixed monomers (30 parts of acrylic acid, 15 parts of isooctyl acrylate and 15 parts of octadecyl methacrylate), mixed solvents (5 parts of propylene glycol methyl ether, 5 parts of butyl acetate and 5 parts of xylene), 3 parts of benzoyl peroxide as an initiator, 951 parts of a neutralizer AMP-951 and 50 parts of deionized water, and the preparation process is as follows:
(1) mixing all the mixed monomers with 80% of initiator to obtain a mixed solution A;
(2) adding 80% of mixed solvent into a reaction kettle, starting stirring, heating to 120 ℃, then uniformly dripping the mixed solution A, finishing dripping for 4 hours, and then preserving heat at 120 ℃ for 30 min;
(3) mixing the rest mixed solvent and the rest initiator, dripping the mixture into the reactant obtained in the step (2), keeping the temperature for 4 hours after dripping for 10 min;
(4) cooling to 60-70 ℃, adding a neutralizing agent, uniformly dropwise adding deionized water under the stirring and dispersing conditions of 3000r/min for reverse phase emulsification, cooling to below 40 ℃ after dropwise adding is finished for 2h, and discharging to obtain the aqueous hydroxyl acrylic resin in the embodiment 1-3.
The component B of the waterborne polyurethane base coat comprises 50 parts by weight of poly HDI curing agent (N3900 of Corsai chemical Co., Ltd.), and 30 parts by weight of poly IPDI curing agent D803 of Corui (aliphatic polyisocyanate with NCO content of 11.5-12%); 20 parts by weight of PGDA solvent.
TABLE 2 examples and comparative examples A-component raw materials of aqueous polyurethane varnish
Wherein the dispersant is selected from German Bick chemical dispersant BYK-190; the pH regulator is AMP-95 from Haimax; the defoaming agent is 902W defoaming agent of Degussa company; the substrate wetting agent is polyether siloxane copolymer WET270 of Degussa company; the thickener is PUR62 thickener from German Mingling company; the aqueous hydroxy acrylic resin in examples 1 to 3 is a resin (solid content is 40 to 45% and hydroxyl group content is 3.8 to 4.2%) of feilu high-tech materials ltd, and the raw materials and the preparation method are the same as above; comparative examples 1-2, the aqueous hydroxy acrylic resin was kesichun 2470 with a solids content of 41% and a hydroxyl content of 4.0%.
The B component of the aqueous polyurethane varnish comprises 50 parts by weight of poly HDI curing agent (N3900 of Corsai chemical), 30 parts by weight of poly IPDI curing agent Corui D803 (aliphatic polyisocyanate with NCO content of 11.5-12%) and 20 parts by weight of PGDA solvent.
The method for preparing the waterborne wet-sprayable coating for motor vehicles of the embodiment comprises the following steps:
(1) according to the proportion of the raw materials of the component A in the waterborne polyurethane base coat, uniformly stirring the waterborne hydroxyl acrylic resin and the pH regulator (the stirring speed is 680r/min), sequentially adding deionized water, an anti-settling agent, a dispersing agent, a defoaming agent and pigment and filler, uniformly stirring, and grinding until the fineness is less than or equal to 10 microns; continuously adding a base material wetting agent and a thickening agent under the stirring state, adjusting the viscosity to 0.8-1.5 Pa.S, and detecting that the pH value is 7.5-8.0 to obtain a component A of the waterborne polyurethane base coat;
(2) uniformly stirring and mixing an HDI curing agent, an IPDI curing agent and a PGDA solvent according to the raw material ratio of the component B in the waterborne polyurethane base color paint to obtain the component B of the waterborne polyurethane base color paint;
(3) according to the proportion of the component A in the aqueous polyurethane varnish, uniformly stirring the aqueous hydroxyl acrylic resin and the pH regulator (the stirring speed is 680r/min), then sequentially adding deionized water, a dispersing agent and a defoaming agent, uniformly stirring, and grinding until the fineness is less than or equal to 10 microns; continuously adding a base material wetting agent and a thickening agent under the stirring state, adjusting the viscosity to 0.8-1.5 Pa.S, detecting that the pH value is 7.5-8.0, and filtering to obtain a component A of the aqueous polyurethane varnish;
(4) and (3) according to the proportion of the component B in the aqueous polyurethane varnish, uniformly stirring and mixing the poly HDI curing agent, the poly IPDI curing agent and the PGDA solvent to obtain the component B of the aqueous polyurethane varnish.
In the embodiment, the mass ratio of the component A to the component B of the waterborne polyurethane base coat is 6:1, and the mass ratio of the component A to the component B of the waterborne polyurethane varnish is 2.5: 1. The waterborne polyurethane base color paint A component and the waterborne polyurethane base color paint B component are uniformly mixed and stirred according to the mass ratio of 6:1, then a proper amount of water is added to adjust the construction viscosity to 18-24 seconds (the coating viscosity of 4 cups) and stands for 15-30 minutes, high-pressure airless spraying/diaphragm pump spraying is carried out, leveling is carried out for 30 minutes after the spraying is finished, waterborne polyurethane varnish which is well adjusted according to the A, B component ratio (2.5:1) is sprayed, after the leveling is carried out for 30 minutes after the waterborne polyurethane varnish is sprayed, the temperature is raised to 60 ℃ and the baking is carried out for 120 minutes, and a high-performance paint film with high decoration, high weather resistance and no defects of the paint film is obtained.
The results of the main performance tests on the wet-spray paint films of example 1 and comparative example are shown in table 3.
TABLE 3 comparison of the results of the main performance tests of wet-sprayed wet paint films of waterborne polyurethane base paints and waterborne polyurethane varnishes
As can be seen from the test data in Table 3, the surface drying time of the base color paint in the technical scheme (embodiment) of the invention is less than or equal to 30 minutes, while the surface drying time of the comparative examples 1 and 2 is 45 minutes and 55 minutes respectively, and the surface drying speed can show that moisture in the comparative examples 1 and 2 remains in the base color paint coating, and the waterborne hydroxyl value acrylic resin adopted by the invention can ensure that the surface drying of the waterborne polyurethane base color paint is realized within 30 minutes without excessive moisture remaining in the base color paint coating; in addition, the limit film thickness of the composite coating coated by the technical scheme (embodiment) of the invention is approximately between 106 and 123um, and is higher than the dry film coating thickness of which the comparison ratio is nearly 20 um. Therefore, the technical scheme of the invention adjusts the surface drying speed to the actual drying speed of the paint film through the selection of the waterborne hydroxyl acrylic resin and the control of the formula, and solves the technical problem that the wet spraying, large-area and thick coating of the waterborne polyurethane base color paint and the waterborne polyurethane varnish is difficult.
Claims (10)
1. The waterborne wettable spraying wet coating for the motor vehicle comprises a waterborne polyurethane base coat and a waterborne polyurethane varnish, and is characterized in that the waterborne polyurethane base coat and the waterborne polyurethane varnish both use waterborne hydroxyl acrylic resin and aliphatic polyisocyanate as film forming substances, and the waterborne hydroxyl acrylic resin is synthesized by using a waterborne monomer, an oily monomer and a super-hydrophobic monomer as synthetic monomers.
2. The aqueous wet-sprayable coating of claim 1 wherein the aqueous monomer is one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxybutyl acrylate; the oily monomer is one or more of methyl methacrylate, butyl acrylate, isooctyl acrylate and isobornyl acrylate; the super-hydrophobic monomer is one or more of dodecyl methacrylate, octadecyl methacrylate, dodecafluoroheptyl methacrylate and octafluoropentyl methacrylate; and the super-hydrophobic monomer accounts for 10-30% of the total monomer.
3. The aqueous wet sprayable coating of claim 1 wherein the solvent in the aqueous hydroxy acrylic resin is a mixture of an alcohol ether solvent, an aliphatic solvent, and an aromatic hydrocarbon oil solvent.
4. The waterborne wettable spray-on coating for motor vehicles of claim 3 wherein said alcohol-ether-based solvent comprises one or more of propylene glycol methyl ether, ethylene glycol butyl ether, propylene glycol butyl ether, and said lipid-based solvent comprises one or more of ethylene glycol ethyl ether acetate, propylene glycol methyl ether acetate, butyl acetate; the aromatic hydrocarbon oil solvent comprises one or more of dimethylbenzene and trimethylbenzene.
5. A waterborne wettable spray-wet coating for motor vehicles according to claim 1 wherein said waterborne hydroxyacrylic resin has a solids content of 40% to 45% and a hydroxyl content of 3.0% to 3.5%.
6. The waterborne wet-sprayable coating of any of claims 1 to 5, wherein the waterborne polyurethane basecoat comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
30-50 parts of poly HDI curing agent, wherein the poly HDI curing agent is aliphatic polyisocyanate with NCO content of 18.5-19%;
20-30 parts of poly IPDI curing agent, wherein the poly IPDI curing agent is aliphatic polyisocyanate with NCO content of 11.5-12%;
10-30 parts of PGDA solvent.
7. The aqueous, wet-sprayable coating for motor vehicles of claim 6 wherein the anti-settling agent is magnesium aluminum polysilicate; the pigment filler comprises pigment and filler, and the pigment is one or more of iron oxide red, carbon black and titanium pigment; the filler is one or more of talcum powder, barium sulfate, silicon micropowder and mica powder.
8. The waterborne wettable spray-wet coating for motor vehicles according to any one of claims 1 to 5, which comprises an A component and a B component, wherein the A component comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
30-50 parts of poly HDI curing agent, wherein the poly HDI curing agent is aliphatic polyisocyanate with NCO content of 18.5-19%;
20-30 parts of poly IPDI curing agent, wherein the poly IPDI curing agent is aliphatic polyisocyanate with NCO content of 11.5-12%;
10-30 parts of PGDA solvent.
9. The aqueous, wet-sprayable coating for motor vehicles of claim 6 or 8 wherein the dispersant is a nonionic polyether acrylate polymer; the pH regulator is one of ammonia water, N dimethylethanolamine, triethylamine and AMP-95; the defoaming agent is an organic silicon defoaming agent; the matrix wetting agent is polyether siloxane copolymer; the film-forming aid is dipropylene glycol butyl ether, and the thickener is a polyurethane thickener.
10. A method of making a waterborne wet-sprayable wet-coating for a motor vehicle according to any of claims 1 to 9 comprising the steps of:
(1) according to the raw material ratio of the component A in the waterborne polyurethane base coat, uniformly stirring the waterborne hydroxyl acrylic resin and the pH regulator, sequentially adding deionized water, the anti-settling agent, the dispersant, the defoaming agent and the pigment filler, uniformly stirring, and grinding to the fineness of less than or equal to 10 microns; under the stirring state, continuously adding a base material wetting agent and a thickening agent, and obtaining a component A of the waterborne polyurethane base paint after detecting the viscosity fineness and the qualified pH value;
(2) according to the raw material ratio of the component B in the waterborne polyurethane base coat, uniformly stirring and mixing a poly HDI curing agent, a poly IPDI curing agent and a PGDA solvent to obtain the component B of the waterborne polyurethane base coat;
(3) according to the proportion of the component A in the aqueous polyurethane varnish, uniformly stirring the aqueous hydroxyl acrylic resin and the pH regulator, sequentially adding deionized water, a dispersing agent and a defoaming agent, uniformly stirring, and grinding until the fineness is less than or equal to 10 micrometers; continuously adding a base material wetting agent and a thickening agent under the stirring state, detecting the viscosity fineness and qualified pH value, and filtering to obtain a component A of the aqueous polyurethane varnish;
(4) and (3) according to the proportion of the component B in the aqueous polyurethane varnish, uniformly stirring and mixing the poly HDI curing agent, the poly IPDI curing agent and the PGDA solvent to obtain the component B of the aqueous polyurethane varnish.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558404A (en) * | 2022-09-26 | 2023-01-03 | 中远关西涂料（上海）有限公司 | Preparation method of water-based high-gloss polyurethane finish paint suitable for engineering machinery |
| CN116396646A (en) * | 2023-03-14 | 2023-07-07 | 广东达尔新型材料有限公司 | Water-based water-resistant full-matt varnish as well as preparation method and application thereof |
| CN117801647A (en) * | 2023-11-17 | 2024-04-02 | 雅图高新材料股份有限公司 | Water-based paint composition suitable for wet-on-wet construction and preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102850703A (en) * | 2011-06-27 | 2013-01-02 | 上海涂料有限公司技术中心 | Method for preparing hydroxy-containing polyacrylate secondary aqueous dispersion |
| CN105254904A (en) * | 2015-09-30 | 2016-01-20 | 中国海洋石油总公司 | Fluorinated hydroxy acrylic resin aqueous dispersion and preparation method thereof |
| CN106752601A (en) * | 2016-12-30 | 2017-05-31 | 上海奇想青晨新材料科技股份有限公司 | A kind of carbon titanium water-base resin anti-flaming dope and preparation method thereof |
| CN108530578A (en) * | 2018-04-20 | 2018-09-14 | 同光（江苏）新材料科技有限公司 | A kind of aqueous hydroxy acryl acid resin secondary breakup body and its synthetic method |
| CN110204648A (en) * | 2019-04-24 | 2019-09-06 | 武汉仕全兴新材料科技股份有限公司 | Aqueous fluorine-containing Hydroxylated acrylic resin and water paint containing the resin |
| US20200255620A1 (en) * | 2015-11-16 | 2020-08-13 | Huntsman International Llc | (super)hydrophobic isocyanate based porous materials |
-
2020
- 2020-12-11 CN CN202011461048.4A patent/CN112574660B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102850703A (en) * | 2011-06-27 | 2013-01-02 | 上海涂料有限公司技术中心 | Method for preparing hydroxy-containing polyacrylate secondary aqueous dispersion |
| CN105254904A (en) * | 2015-09-30 | 2016-01-20 | 中国海洋石油总公司 | Fluorinated hydroxy acrylic resin aqueous dispersion and preparation method thereof |
| US20200255620A1 (en) * | 2015-11-16 | 2020-08-13 | Huntsman International Llc | (super)hydrophobic isocyanate based porous materials |
| CN106752601A (en) * | 2016-12-30 | 2017-05-31 | 上海奇想青晨新材料科技股份有限公司 | A kind of carbon titanium water-base resin anti-flaming dope and preparation method thereof |
| CN108530578A (en) * | 2018-04-20 | 2018-09-14 | 同光（江苏）新材料科技有限公司 | A kind of aqueous hydroxy acryl acid resin secondary breakup body and its synthetic method |
| CN110204648A (en) * | 2019-04-24 | 2019-09-06 | 武汉仕全兴新材料科技股份有限公司 | Aqueous fluorine-containing Hydroxylated acrylic resin and water paint containing the resin |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558404A (en) * | 2022-09-26 | 2023-01-03 | 中远关西涂料（上海）有限公司 | Preparation method of water-based high-gloss polyurethane finish paint suitable for engineering machinery |
| CN116396646A (en) * | 2023-03-14 | 2023-07-07 | 广东达尔新型材料有限公司 | Water-based water-resistant full-matt varnish as well as preparation method and application thereof |
| CN117801647A (en) * | 2023-11-17 | 2024-04-02 | 雅图高新材料股份有限公司 | Water-based paint composition suitable for wet-on-wet construction and preparation method and application thereof |
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