CN109722154B - Waterborne polyurethane metal flashing paint for automobile repair and preparation method thereof - Google Patents
Waterborne polyurethane metal flashing paint for automobile repair and preparation method thereof Download PDFInfo
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Abstract
The invention discloses waterborne polyurethane metal flashing paint for automobile repair and a preparation method thereof, belonging to the field of paint. The flashing paint consists of a component A and a component B, wherein the component A comprises aqueous hydroxyl acrylic emulsion, aqueous aluminum paste, pigment, film forming auxiliary agent, base material wetting agent, defoaming agent, thickening agent, aluminum powder directional arrangement auxiliary agent, ultraviolet absorber and deionized water; the component B comprises an HDI type isocyanate curing agent, an anhydrous diluent and a dehydrating agent. The self-made waterborne hydroxyl acrylic emulsion is used as film-forming resin, and has the advantages of ultralow VOC, quick drying, high gloss, high hardness and the like, the prepared waterborne polyurethane metallic flashing paint has excellent corrosion resistance such as water resistance, acid and alkali resistance, oil resistance, salt spray resistance and the like, and gloss and color retention, the paint film is dried quickly, the coating time can be shortened, and the repair efficiency can be improved.
Description
Technical Field
The invention relates to a metallic flashing paint, in particular to a waterborne polyurethane metallic flashing paint applied to automobile repair and a preparation method thereof.
Background
In recent years, with the continuous high-speed increase of automobile holding quantity and the continuous increase of the service life of automobiles in China, the automobile repairing paint becomes one of the fastest growing paint varieties in the paint industry in China. However, at present, the traditional solvent-based paint is generally adopted in domestic automobile repair paint, and the solvent-based paint inevitably discharges a large amount of organic compounds (VOC) and Harmful Air Pollutants (HAPS) in the production and construction processes, seriously harms human health and pollutes the environment. Therefore, in 2010, GB 24409 and 2009 Standard of Limit of harmful substances in automobile coatings is issued by the nation, and the discharge amount of VOC in the automobile coatings is strictly limited; in the beginning of 2015, the national ministry of finance and the national tax administration jointly issue a 'notice about collecting the consumption tax on the coating', wherein the notice requires that from 15 years, 2 months and 1 day, the consumption tax is collected on the coating with the Volatile Organic Compound (VOC) content higher than 420g/L in the production, entrustment and import links under the construction state, and the applicable tax rate is 4%.
In order to meet the environmental protection requirement and promote the green and sustainable development of the automobile repair coating industry, the automobile repair coating is developing towards the water-based, high-solid and powder coating direction, and the water-based is the most effective way.
Metallic flashing paint is a finish paint which can present different brightness and colors along with the change of an observation angle, and is popular due to the special metallic luster, so that the metallic flashing paint is the most popular process for coating a vehicle body at present. The water-based metallic flashing paint taking the water-based acrylic resin as the main film forming substance can be self-crosslinked at room temperature, has the advantages of quick drying, low cost and the like, but also has the defects of difficult color mixing, poor interlayer adhesion and poor water resistance; the water-based metal flashing paint taking the water-based polyester resin-amino resin as the main film forming substance has good adhesive force, good water resistance and chemical resistance, but needs to be cured at the high temperature of 140-180 ℃. The automobile refinishing paint requires a paint film with excellent adhesion, higher gloss, quick drying, good water resistance, chemical resistance and aging resistance, and must also be capable of being cured at low temperature.
Disclosure of Invention
The invention provides a novel synthesis method of a room-temperature-curable water-based hydroxy acrylic emulsion with ultralow VOC, high gloss, high hardness and quick drying based on the reduction of VOC (volatile organic compounds) emission of automobile refinishing paint; and a proper auxiliary agent is selected to prepare the waterborne polyurethane metallic flashing paint for repairing the automobile, which has excellent adhesive force, high luster, high hardness and quick drying, and the preparation method thereof. The product of the invention has excellent adhesive force, outstanding water resistance, chemical resistance and aging resistance, can be compared favorably with similar products abroad in performance, and has cheaper price; the drying speed of the paint film is increased on the basis of ensuring the good appearance and performance of the paint film, and the coating time is shortened, so that the production efficiency of automobile manufacturers is improved, and the paint film has great market potential.
The purpose of the invention can be realized by the following technical scheme:
the waterborne polyurethane metallic flashing paint for repairing the automobile comprises a component A and a component B in a mass ratio of 4-10: 1, wherein:
the component A comprises the following components in parts by mass: 40-70 parts of water-based hydroxyl acrylic emulsion, 20-40 parts of water-based aluminum paste, 1-5 parts of pigment, 2-4 parts of film-forming additive, 0.1-0.5 part of base material wetting agent, 0.1-1 part of defoaming agent, 0.5-2 parts of thickening agent, 0.1-5 parts of aluminum powder directional arrangement additive, 1-5 parts of ultraviolet absorber and 0.1-10 parts of deionized water;
the component B comprises the following components in parts by mass: 60-90 parts of HDI type isocyanate curing agent, 10-40 parts of anhydrous diluent and 1-5 parts of dehydrating agent;
wherein: the aqueous hydroxy acrylic emulsion is prepared by the following method:
(1) uniformly mixing 10-30 parts of methyl methacrylate, 2-10 parts of methacrylic acid positive definite ester, 5-15 parts of styrene, 20-30 parts of hydroxyethyl methacrylate, 8-12 parts of methacrylic acid, 10-15 parts of isooctyl acrylate, 10-15 parts of 2-methyl-2-acrylic acid, 1-5 parts of mixed surfactant and 30-50 parts of distilled water under the condition of stirring to prepare a pre-emulsion;
(2) adding 10% pre-emulsion, stirring, heating to 75 ℃, adding 0.3% potassium persulfate initiator, keeping the reaction temperature at 75 ℃, stirring, polymerizing for 1h, slowly adding the rest pre-emulsion and initiator into a reaction flask, continuously stirring, reacting for 1h after the addition is finished, heating to 85 ℃, keeping the temperature for 2h, cooling to 40 ℃, adding a neutralizer to adjust the pH value to 7.0-9.0, keeping the temperature for 20min, filtering, and discharging to obtain the aqueous hydroxy acrylic emulsion;
the water-based aluminum paste is prepared by the following method: under the low-speed stirring state, 5-10 parts of distilled water and 5-10 parts of ethylene glycol monobutyl ether are mixed and stirred uniformly, the rotating speed of the high-speed stirrer is adjusted to 400-600r/min, 0.05-0.2 part of dimethylethanolamine neutralizer, 0.1-5 parts of dispersant and 10-20 parts of aluminum powder are sequentially added, and the mixture is stirred and dispersed uniformly until no agglomeration exists, so that the water-based aluminum powder slurry is obtained.
The technical scheme of the invention is as follows:
the component A comprises the following components in parts by mass: 50-70 parts of water-based hydroxyl acrylic emulsion, 30-40 parts of water-based aluminum paste, 1-4 parts of pigment, 2-4 parts of film-forming additive, 0.1-0.4 part of base material wetting agent, 0.1-0.8 part of defoaming agent, 1-2 parts of thickening agent, 0.5-4 parts of aluminum powder directional arrangement additive, 2-5 parts of ultraviolet absorber and 0.1-8 parts of deionized water;
the component B comprises the following components in parts by mass: 70-90 parts of HDI type isocyanate curing agent, 10-30 parts of anhydrous diluent and 1-5 parts of dehydrating agent.
The technical scheme of the invention is as follows: the mixed surfactant in the preparation method of the water-based hydroxy acrylic emulsion is a mixture of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether ammonium sulfate and fatty alcohol-polyoxyethylene ether, and the mixing ratio of the sodium dodecyl sulfate, the fatty alcohol-polyoxyethylene ether ammonium sulfate and the fatty alcohol-polyoxyethylene ether is 1:1.5: 1.5.
the technical scheme of the invention is as follows: the dispersant in the preparation method of the water-based aluminum powder slurry is deep bamboo SN-1792, Pick BYK-192,
One or more of Dispers 655 are combined in any proportion.
The technical scheme of the invention is as follows: the aluminum powder in the preparation method of the water-based aluminum paste is one or a combination of a plurality of materials of Acer HYDROLAN-501, Dongyang EMR-D6340 and Asahi WL8005 which are coated and treated by silicon surface according to any proportion. The technical scheme of the invention is as follows: the film-forming assistant is dipropylene glycol butyl ether or dipropylene glycol methyl ether;
the substrate wetting agent is one or a combination of multiple of BYK-345, Tego Wet 270 and coated W-130 according to any proportion;
the defoaming agent is polyether siloxane copolymer TEGO AIREX 901W;
the thickener is polyurethane associated thickener Wanhua
One or more of U902, Hamming RHEOLATE 299 and TEGO Visco plus 3010 are combined according to any proportion;
the aluminum powder directional arrangement auxiliary agent is SN-9721;
the ultraviolet light absorber is
3821, BASF TINUVIN 400 and BASF TINUVIN 123, which are combined according to any proportion.
The technical scheme of the invention is as follows: the HDI type isocyanate curing agent of the component B is one or a plurality of Bayhydur XP 2655, CONONATE AQ-130 and OS-9018 which are combined according to any proportion; the anhydrous diluent is dipropylene glycol dimethyl ether; the dehydrating agent is BF-5.
A preparation method of the waterborne polyurethane metallic flashing paint for repairing the automobile comprises the following steps:
(1) the preparation of the component A comprises the following steps:
step a: mixing and stirring the water-based hydroxyl acrylic emulsion, the water-based aluminum paste and the pigment uniformly according to a ratio under a stirring state, then sequentially adding the film-forming aid, the base material wetting agent, the defoaming agent, the thickening agent, the aluminum powder directional arrangement aid and the ultraviolet light absorber, and stirring uniformly until no shrinkage cavity exists, so as to prepare a first mixed material;
(2) the preparation of the component B comprises the following steps:
step a: adding anhydrous diluent and dehydrating agent under stirring, and mixing and stirring uniformly;
step b: adding an HDI type isocyanate curing agent, and uniformly stirring to prepare a second mixed material;
(3) and uniformly mixing the first mixed material and the second mixed material according to the mass ratio of 4-10: 1 to obtain a target product.
The invention has the beneficial effects that:
(1) the invention has simple synthesis process and mild reaction temperature and condition, and the synthesized aqueous hydroxy acrylic emulsion has ultralow VOC, high gloss and high hardness.
(2) The invention can adjust the construction, film formation and performance of the waterborne polyurethane metal flashing paint by designing the proportion of soft and hard monomers, the glass transition temperature and the hydroxyl content, and the prepared waterborne polyurethane metal flashing paint has excellent water resistance, acid and alkali resistance, salt spray resistance and other corrosion resistance and light and color retention.
(3) According to the invention, through formula design and optimization, a proper film-forming assistant is selected, a plurality of isocyanate curing agents are compounded, a proper solvent is selected for dilution, the volatilization speed of the solvent and water is adjusted, the drying speed of a paint film is increased on the basis of ensuring the good appearance and performance of the paint film, the coating time is shortened, and the repair efficiency is increased.
(4) The waterborne polyurethane metallic flashing paint for repairing the automobile can be compared with similar products abroad in performance, is cheaper and has huge market potential.
Detailed Description
The invention is further illustrated by the following examples, without limiting the scope of the invention:
TABLE 1 Components and amounts of examples 1-4
Comparative examples 1 to 4 are given in terms of the respective components and amounts thereof
The preparation method of the aqueous hydroxy acrylic emulsion and the aqueous aluminum paste in the example 1 comprises the following steps:
preparation of aqueous hydroxy acrylic emulsion: preparing a pre-emulsion from 18 parts by mass of methyl methacrylate, 7 parts by mass of n-butyl methacrylate, 11 parts by mass of styrene, 28 parts by mass of hydroxyethyl methacrylate, 8.5 parts by mass of methacrylic acid, 14 parts by mass of isooctyl acrylate, 12.5 parts by mass of 2-methyl-2-acrylic acid, 3 parts by mass of a mixed surfactant (a mixture of sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate and fatty alcohol polyoxyethylene ether, the mixing ratio of the three being 1:1.5:1.5) and 38.5 parts by mass of distilled water under stirring conditions; adding 10% of pre-emulsion into a four-neck flask provided with a thermometer, a condensation reflux device, a monomer dripping device and a stirring paddle, stirring and heating to 75 ℃, adding 0.3% of potassium persulfate initiator, keeping the reaction temperature at 75 ℃, stirring and polymerizing for 1h, dripping the rest monomers and the initiator into the reaction flask simultaneously, wherein the dripping time is 4h, after the dripping is finished, continuously stirring and reacting for 1h, heating to 85 ℃, keeping the temperature for 2h, cooling to 40 ℃, adding a neutralizer to adjust the pH value to 7.0-9.0, keeping the temperature for 20min, filtering, and discharging to obtain the aqueous hydroxyl acrylic emulsion.
Preparing water-based aluminum paste: under the low-speed stirring state, 8.45 parts of distilled water and 5 parts of ethylene glycol monobutyl ether are mixed and stirred uniformly, the rotating speed of the high-speed stirrer is adjusted to 400-600r/min, and 0.05 part of dimethylethanolamine neutralizer and 4.5 parts of dimethylethanolamine neutralizer are added in sequence
Dispers 655 and 12 parts of eastern EMR-D6340 aluminum powder are uniformly stirred and dispersed until no lumps are formed, and aqueous aluminum powder slurry is obtained.
The preparation method of the aqueous hydroxy acrylic emulsion and the aqueous aluminum paste in the example 2 comprises the following steps:
preparation of aqueous hydroxy acrylic emulsion: same as in example 1.
Preparing water-based aluminum paste: under the low-speed stirring state, 6.85 parts of distilled water and 3 parts of ethylene glycol monobutyl ether are mixed and stirred uniformly, the rotating speed of a high-speed stirrer is adjusted to 400-600r/min, 0.15 part of dimethylethanolamine neutralizer, 2 parts of BYK-192 dispersant and 18 parts of eca HYDROLAN-501 aluminum powder are sequentially added, and the mixture is stirred and dispersed uniformly until no agglomeration exists, so that the water-based aluminum powder slurry is obtained.
The preparation method of the aqueous hydroxy acrylic emulsion and the aqueous aluminum paste in the embodiment 3 is as follows:
preparation of aqueous hydroxy acrylic emulsion: preparing a pre-emulsion from 26 parts by mass of methyl methacrylate, 4 parts by mass of n-butyl methacrylate, 6 parts by mass of styrene, 22 parts by mass of hydroxyethyl methacrylate, 11.5 parts by mass of methacrylic acid, 12 parts by mass of isooctyl acrylate, 10.5 parts by mass of 2-methyl-2-acrylic acid, 4.5 parts by mass of a mixed surfactant (a mixture of sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate and fatty alcohol polyoxyethylene ether, the mixing ratio of the sodium dodecyl sulfate, the fatty alcohol polyoxyethylene ether ammonium sulfate and the fatty alcohol polyoxyethylene ether is 1:1.5:1.5) and 45 parts by mass of distilled water under the stirring condition; adding 10% of pre-emulsion into a four-neck flask provided with a thermometer, a condensation reflux device, a monomer dripping device and a stirring paddle, stirring and heating to 75 ℃, adding 0.3% of potassium persulfate initiator, keeping the reaction temperature at 75 ℃, stirring and polymerizing for 1h, dripping the rest monomers and the initiator into the reaction flask simultaneously, wherein the dripping time is 3.5h, after the dripping is finished, continuously stirring and reacting for 1h, heating to 85 ℃, keeping the temperature for 2h, cooling to 40 ℃, adding a neutralizer to adjust the pH value to 7.0-9.0, keeping the temperature for 20min, filtering, and discharging to obtain the waterborne hydroxyl acrylic emulsion.
Preparing water-based aluminum paste: under the low-speed stirring state, 2.9 parts of distilled water and 6 parts of ethylene glycol monobutyl ether are mixed and stirred uniformly, the rotating speed of a high-speed stirrer is adjusted to 400-DEG C600 r/min, 0.1 part of dimethylethanolamine neutralizer, 5 parts of SN-1792 dispersant and 16 parts of Assun WL8005 aluminum powder are added in sequence, and the mixture is stirred and dispersed uniformly until no agglomeration exists, so that the water-based aluminum powder slurry is obtained.
The preparation method of the aqueous hydroxy acrylic emulsion and the aqueous aluminum paste in the embodiment 4 is as follows:
preparation of aqueous hydroxy acrylic emulsion: same as in example 3.
Preparing water-based aluminum paste: under the low-speed stirring state, 1.92 parts of distilled water and 4 parts of ethylene glycol monobutyl ether are mixed and stirred uniformly, the rotating speed of a high-speed stirrer is adjusted to 400-DEG C600 r/min, 0.08 part of dimethylethanolamine neutralizer, 4 parts of mixed dispersant (ByK-192 and SN-1792, the mixing ratio is 1:3) and 20 parts of eastern EMR-D6340 aluminum powder are sequentially added, and the mixture is stirred and dispersed uniformly until no agglomeration exists, so that the water-based aluminum powder slurry is obtained.
The method for preparing the aqueous hydroxyacrylic acid emulsion and the aqueous aluminum paste in comparative example 1 was as follows:
preparation of aqueous hydroxy acrylic emulsion: preparing a pre-emulsion from 30 parts by mass of methyl methacrylate, 3 parts by mass of styrene, 18 parts by mass of hydroxyethyl methacrylate, 8 parts by mass of methacrylic acid, 12 parts by mass of isooctyl acrylate, 4.5 parts by mass of a mixed surfactant (a mixture of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether ammonium sulfate and fatty alcohol-polyoxyethylene ether in a mixing ratio of 1:1.5:1.5) and 32 parts by mass of distilled water under stirring conditions; adding 10% of pre-emulsion into a four-neck flask provided with a thermometer, a condensation reflux device, a monomer dripping device and a stirring paddle, stirring and heating to 75 ℃, adding 0.3% of potassium persulfate initiator, keeping the reaction temperature at 75 ℃, stirring and polymerizing for 1h, dripping the rest monomers and the initiator into the reaction flask simultaneously, wherein the dripping time is 3.5h, after the dripping is finished, continuously stirring and reacting for 1h, heating to 85 ℃, keeping the temperature for 2h, cooling to 40 ℃, adding a neutralizer to adjust the pH value to 7.0-9.0, keeping the temperature for 20min, filtering, and discharging to obtain the waterborne hydroxyl acrylic emulsion.
Preparing water-based aluminum paste: same as in example 3.
The method for preparing the aqueous hydroxyacrylic acid emulsion and the aqueous aluminum paste in comparative example 2 was as follows:
preparation of aqueous hydroxy acrylic emulsion: preparing a pre-emulsion from 20 parts by mass of methyl methacrylate, 8 parts by mass of methacrylic acid positive ester, 10 parts by mass of styrene, 30 parts by mass of hydroxypropyl methacrylate, 9 parts by mass of methacrylic acid, 14 parts by mass of isooctyl acrylate, 12 parts by mass of 2-methyl-2-acrylic acid, 3 parts by mass of a mixed surfactant (a mixture of sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate and fatty alcohol polyoxyethylene ether, the mixing ratio of the sodium dodecyl sulfate, the fatty alcohol polyoxyethylene ether ammonium sulfate and the fatty alcohol polyoxyethylene ether is 1:1.5:1.5) and 38.5 parts by mass of distilled water under the stirring condition; adding 10% of pre-emulsion into a four-neck flask provided with a thermometer, a condensation reflux device, a monomer dripping device and a stirring paddle, stirring and heating to 75 ℃, adding 0.3% of potassium persulfate initiator, keeping the reaction temperature at 75 ℃, stirring and polymerizing for 1h, dripping the rest monomers and the initiator into the reaction flask simultaneously, wherein the dripping time is 4h, after the dripping is finished, continuously stirring and reacting for 1h, heating to 85 ℃, keeping the temperature for 2h, cooling to 40 ℃, adding a neutralizer to adjust the pH value to 7.0-9.0, keeping the temperature for 20min, filtering, and discharging to obtain the aqueous hydroxyl acrylic emulsion.
Preparing water-based aluminum paste: same as in example 1.
The preparation method of the aqueous hydroxy acrylic emulsion and the aqueous aluminum paste in the comparative example 3 is as follows:
preparation of aqueous hydroxy acrylic emulsion: same as in example 4.
Preparing water-based aluminum paste: same as in example 4.
The method for preparing the aqueous hydroxyacrylic acid emulsion and the aqueous aluminum paste in comparative example 4 was as follows:
preparation of aqueous hydroxy acrylic emulsion: same as in example 2.
Preparing water-based aluminum paste: same as in example 2.
The preparation methods of the products of examples 1-4 and comparative examples 1-4 are as follows:
the preparation method of the component A comprises the following steps: mixing and stirring the water-based hydroxyl acrylic emulsion, the water-based aluminum paste and the pigment uniformly according to a ratio under a stirring state, then sequentially adding the film-forming aid, the base material wetting agent, the defoaming agent, the thickening agent, the aluminum powder directional arrangement aid and the ultraviolet light absorber, and stirring uniformly until no shrinkage cavity exists, so as to prepare a first mixed material;
the preparation of the component B comprises the following steps:
step a: adding anhydrous diluent and dehydrating agent under stirring, and mixing and stirring uniformly;
step b: adding an HDI type isocyanate curing agent, and uniformly stirring to prepare a second mixed material;
and uniformly mixing the first mixed material and the second mixed material to obtain a target product.
Table 2 performance test report of the waterborne polyurethane metallic flashing paint for repairing automobiles prepared in the present invention (examples 1 to 4):
the performance test report of the waterborne polyurethane metallic flashing paint for repairing the automobile prepared in the invention (comparative examples 1-4) is as follows:
performance testing
The emulsions and the aqueous aluminum pastes obtained in the examples 1 to 4 and the emulsions and the aqueous aluminum pastes obtained in the comparative examples 1 to 4 are prepared into the aqueous polyurethane metal flashing paint for repairing the automobile by adopting the formula shown in the table 1. The test plate preparation, maintenance and performance test are carried out according to the standard method specified by HG/T4570-2013 'waterborne coating for automobiles', and the performance indexes of the obtained main coating are shown in Table 2.
By comparing the test results of example 3 with comparative example 1, the following conclusions can be drawn: the water-based hydroxyl acrylic emulsion with low VOC, high gloss and high hardness can be prepared by designing proper proportion of soft and hard monomers, glass transition temperature and hydroxyl content, and the prepared water-based polyurethane metal flashing paint has high gloss and hardness, and has excellent water resistance, acid and alkali resistance, salt spray resistance and gloss and color retention.
By comparing the test results of example 1 with comparative example 2, the following conclusions can be drawn: the selection of proper hydroxyl monomer is an important factor for improving the dryness of the waterborne polyurethane metal flashing paint for repairing the automobile, and because the reactivity of the crosslinking reaction of isocyanate and hydroxyl with primary hydroxyl is higher than that of secondary hydroxyl, the drying time of the waterborne acrylic emulsion synthesized by selecting hydroxyethyl methacrylate monomer is shorter, and the hardness of the coating film is higher.
By comparing the test results of example 4 with comparative example 3, the following conclusions can be drawn: through formula design and optimization, a quick-drying film-forming auxiliary agent is selected, a plurality of isocyanate curing agents are compounded, a proper solvent is selected for dilution, the volatilization speed of the solvent and water is adjusted, the drying speed of a paint film is improved on the basis of ensuring the good appearance and performance of the paint film, the coating time is shortened, and the repairing efficiency is improved.
By comparing the test results of example 2 with comparative example 4, the following conclusions can be drawn: the ultraviolet light absorber is indispensable for the waterborne polyurethane metallic flashing paint for repairing the automobile with high gloss and color retention. In the absence of UV absorber (comparative example 4), there was no significant difference in gloss, dryness and mechanical properties of the coating, and there was no significant reduction in water and chemical resistance, but significant reduction in weathering resistance.
Claims (5)
1. The waterborne polyurethane metallic flashing paint for repairing the automobile is characterized by comprising the following components in parts by weight: the adhesive is prepared from a component A and a component B in a mass ratio of 4-10: 1, wherein:
the component A comprises the following components in parts by mass: 40-70 parts of water-based hydroxyl acrylic emulsion, 20-40 parts of water-based aluminum paste, 1-5 parts of pigment, 2-4 parts of film-forming additive, 0.1-0.5 part of base material wetting agent, 0.1-1 part of defoaming agent, 0.5-2 parts of thickening agent, 0.1-5 parts of aluminum powder directional arrangement additive, 1-5 parts of ultraviolet absorber and 0.1-10 parts of deionized water;
the component B comprises the following components in parts by mass: 60-90 parts of HDI type isocyanate curing agent, 10-40 parts of anhydrous diluent and 1-5 parts of dehydrating agent;
the HDI type isocyanate curing agent of the component B is one or a plurality of Bayhydur XP 2655, CONONATE AQ-130 and OS-9018 which are combined according to any proportion; the anhydrous diluent is dipropylene glycol dimethyl ether; the dehydrating agent is BF-5;
wherein: the aqueous hydroxy acrylic emulsion is prepared by the following method:
(1) uniformly mixing 10-30 parts of methyl methacrylate, 2-10 parts of n-butyl methacrylate, 5-15 parts of styrene, 20-30 parts of hydroxyethyl methacrylate, 8-12 parts of methacrylic acid, 10-15 parts of isooctyl acrylate, 10-15 parts of 2-methyl-2-acrylic acid, 1-5 parts of mixed surfactant and 30-50 parts of distilled water under the condition of stirring to prepare a pre-emulsion;
(2) adding 10% pre-emulsion, stirring, heating to 75 ℃, adding 0.3% potassium persulfate initiator, keeping the reaction temperature at 75 ℃, stirring, polymerizing for 1h, slowly adding the rest pre-emulsion and initiator into a reaction flask, continuously stirring, reacting for 1h after the addition is finished, heating to 85 ℃, keeping the temperature for 2h, cooling to 40 ℃, adding a neutralizer to adjust the pH value to 7.0-9.0, keeping the temperature for 20min, filtering, and discharging to obtain the aqueous hydroxy acrylic emulsion;
the water-based aluminum paste is prepared by the following method: under the low-speed stirring state, mixing and stirring 5-10 parts of distilled water and 5-10 parts of ethylene glycol monobutyl ether uniformly, adjusting the rotating speed of a high-speed stirrer to 400-600r/min, sequentially adding 0.05-0.2 part of dimethylethanolamine neutralizer, 0.1-5 parts of dispersant and 10-20 parts of aluminum powder, and stirring and dispersing uniformly until no agglomeration exists, so as to obtain aqueous aluminum powder slurry;
the dispersant in the preparation method of the water-based aluminum powder slurry is one or a plurality of deep bamboo SN-1792, Bike BYK-192 and TEGO Dispers 655 which are combined according to any proportion; the aluminum powder in the preparation method of the aqueous aluminum paste is one or a combination of more of Ika HYDROOLAN-501, Dongyang EMR-D6340 and Asahi Yang WL8005 according to any proportion;
the film-forming assistant is dipropylene glycol butyl ether or dipropylene glycol methyl ether; the ultraviolet absorber is one or more of NANOBYK-3821, BASF TINUVIN 400 and BASF TINUVIN 123 which are combined according to any proportion.
2. The waterborne polyurethane metallic flashing paint for automobile repair according to claim 1, which is characterized in that:
the component A comprises the following components in parts by mass: 50-70 parts of water-based hydroxyl acrylic emulsion, 30-40 parts of water-based aluminum paste, 1-4 parts of pigment, 2-4 parts of film-forming additive, 0.1-0.4 part of base material wetting agent, 0.1-0.8 part of defoaming agent, 1-2 parts of thickening agent, 0.5-4 parts of aluminum powder directional arrangement additive, 2-5 parts of ultraviolet absorber and 0.1-8 parts of deionized water;
the component B comprises the following components in parts by mass: 70-90 parts of HDI type isocyanate curing agent, 10-30 parts of anhydrous diluent and 1-5 parts of dehydrating agent.
3. The waterborne polyurethane metallic flashing paint for automobile repair according to claim 1, which is characterized in that:
the mixed surfactant in the preparation method of the water-based hydroxy acrylic emulsion is a mixture of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether ammonium sulfate and fatty alcohol-polyoxyethylene ether, and the mixing ratio of the sodium dodecyl sulfate, the fatty alcohol-polyoxyethylene ether ammonium sulfate and the fatty alcohol-polyoxyethylene ether is 1:1.5: 1.5.
4. the waterborne polyurethane metallic flashing paint for automobile repair according to claim 1, which is characterized in that:
the substrate wetting agent is one or a combination of multiple of BYK-345, Tego Wet 270 and coated W-130 according to any proportion;
the defoaming agent is polyether siloxane copolymer TEGO AIREX 901W;
the thickener is one or a plurality of polyurethane associated thickeners of Wanhua Vesmody U902, Haimines RHEOLATE 299 and TEGO ViscoPlus 3010 which are combined according to any proportion;
the aluminum powder directional arrangement auxiliary agent is SN-9721.
5. A preparation method of the waterborne polyurethane metallic flashing paint for repairing the automobile as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
(1) the preparation of the component A comprises the following steps:
step a: mixing and stirring the water-based hydroxyl acrylic emulsion, the water-based aluminum paste and the pigment uniformly according to a ratio under a stirring state, then sequentially adding the film-forming aid, the base material wetting agent, the defoaming agent, the thickening agent, the aluminum powder directional arrangement aid and the ultraviolet light absorber, and stirring uniformly until no shrinkage cavity exists, so as to prepare a first mixed material;
(2) the preparation of the component B comprises the following steps:
step a: adding anhydrous diluent and dehydrating agent under stirring, and mixing and stirring uniformly;
step b: adding an HDI type isocyanate curing agent, and uniformly stirring to prepare a second mixed material;
(3) and uniformly mixing the first mixed material and the second mixed material according to the mass ratio of 4-10: 1 to obtain a target product.
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| CN111349384B (en) * | 2020-04-15 | 2021-10-12 | 南京长江涂料有限公司 | Weather-resistant water-based sand textured paint and preparation method thereof |
| CN112708031A (en) * | 2020-12-25 | 2021-04-27 | 嘉宝莉化工集团股份有限公司 | Water-based hydroxyl acrylic emulsion and preparation method and application thereof |
| CN114525075B (en) * | 2022-03-15 | 2022-09-02 | 雅图高新材料股份有限公司 | Ultra-fast-drying water-based varnish for automobile repair and preparation method thereof |
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| JP2002003791A (en) * | 2000-06-23 | 2002-01-09 | Toyota Central Res & Dev Lab Inc | Aqueous coating material |
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| CN101787098B (en) * | 2010-02-26 | 2012-02-01 | 华南理工大学 | Preparation method and application of acrylate heterozygotic emulsion |
| CN102161770B (en) * | 2011-01-13 | 2012-12-26 | 汤汉良 | Quick-drying hydroxylated acrylic resin water dispersion and preparation method and use thereof |
| CN102351982B (en) * | 2011-07-26 | 2013-04-17 | 青岛德鑫汽车涂料有限公司 | Waterborne acrylic resin and metal flashing paint applying same |
| CN102627720A (en) * | 2012-02-17 | 2012-08-08 | 汤汉良 | Normal-temperature quick-drying aqueous hydroxy acrylic resin and its preparation method and application |
| CN102627717A (en) * | 2012-02-17 | 2012-08-08 | 汤汉良 | Acrylic acid aqueous dispersion for nanometer pearlescent pigment and preparation method thereof |
| CN105418833A (en) * | 2015-12-25 | 2016-03-23 | 江门市制漆厂有限公司 | Acrylic resin used for high-solid-content stoving varnish and preparation method thereof |
| CN105585947A (en) * | 2016-03-15 | 2016-05-18 | 广东绿色大地化工有限公司 | Water-based acrylic acid shining paint and preparation method thereof |
| CN108047912B (en) * | 2017-12-15 | 2020-07-14 | 雅图高新材料股份有限公司 | Super-weather-resistant low-VOC (volatile organic compound) bus colored paint and preparation method thereof |
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