CN109608960B - Preparation method of automobile finish - Google Patents
Preparation method of automobile finish Download PDFInfo
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- CN109608960B CN109608960B CN201811266444.4A CN201811266444A CN109608960B CN 109608960 B CN109608960 B CN 109608960B CN 201811266444 A CN201811266444 A CN 201811266444A CN 109608960 B CN109608960 B CN 109608960B
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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
- C09D143/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
- C09D143/04—Homopolymers or copolymers of monomers containing silicon
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a preparation method of an automobile finish, and belongs to the technical field of paint preparation. According to the invention, the waterborne polyurethane and the fluorosilicone resin are blended and modified to prepare the automobile finish with better hydrophobicity, and the prepared automobile finish not only has the high-strength mechanical property of single-component polyurethane, but also has high gloss, low curing temperature, excellent acid and alkali resistance, excellent salt spray resistance and excellent weather resistance; the polyurethane resin has better hydrophobicity than polyacrylic resin, so that part of sensitivity to water molecules caused by introduction of amino groups can be offset, and the fluorosilicone resin has excellent temperature resistance, anti-adhesion, chemical resistance, antifouling property and decoration; the curing agent of the invention is isocyanate compound, has good compatibility with various resins and solvents, and has relatively low sensitivity to moisture in air, thus avoiding the defect of paint film caused by high humidity and having high drying speed.
Description
Technical Field
The invention relates to a preparation method of an automobile finish, and belongs to the technical field of paint preparation.
Background
Automotive topcoats are the final coating in automotive multi-layer coating systems that impart automotive color, aesthetic appearance, and the ability to protect the entire coating. The colors of automobiles are developed to diversified individuation, and besides the natural colors, the colors also comprise various glittering colors, such as metal glittering colors and pearl colors. When the finish paint is used for coloring automobiles, the more important thing is to improve the appearance decoration, so that the automobile coating has the performances of high gloss, high fullness, high distinctness of image and the like, and the finish paint coating also has the protection effect on the bottom coating and the finish paint coating.
The automobile finish paint mainly comprises two types: solid color paints and metallic flashing paints. At present, in order to adapt to the coating conditions of environment-friendly coatings, both metallic color and solid color finish paint are coated by a two-coating method (namely ground color and finishing). As the technology for reducing VOC of the ground color layer, the water-based paint has the best effect, the organic solvent content of the water-based metal ground color and the natural color ground color paint is 10-l 5%, and is greatly reduced compared with the organic solvent content of 80% of the organic solvent-based metal ground color paint, so that the discharge amount of VOC is greatly reduced, and the water-based automobile paint is adopted abroad from the 90 s of the 20 th century.
At present, the water-based base paint mainly comprises a water-based acrylic amino resin system and a water-based polyurethane resin system. The aqueous polyurethane coating can be used not only as a primer but also as a finishing varnish because the polyurethane coating has high gloss, good fluidity, high hardness, elasticity even at very low temperatures, and good abrasion and scratch resistance. The excellent performance of polyurethane is not separated from its structure, and its good solvent resistance, acid and alkali resistance and salt water resistance are chemical properties, and its molecular structure has physical network structure formed from urethane bonds.
Among various automobile finish paints, polyurethane paints are widely applied in the field of automobile paints and have good development prospects because the coating film of the polyurethane paint has the advantages of excellent wear resistance, corrosion resistance, weather resistance, high hardness, high elasticity, strong adhesive force and the like. With the continuous development of the automobile industry, the requirements of automobile coating and painting are higher and higher, and the water-based automobile coating is a necessary trend of the development of automobile coatings according to the environmental protection regulation and requirements, the primer, the intermediate coating, the colored paint, the finishing paint and the refinishing paint for automobile body painting can be all made of water-based polyurethane, and the currently used water-based polyurethane automobile coating is mainly of a two-component type.
Under the pressure of the environment, the development of environment-friendly automotive finish is a necessary trend, and the development degree and the development speed are different in the directions of water-based finish, high-solid finish, powdered finish and the like. With the improvement of living standard of people, the automobile has higher requirements on not only excellent service performance but also the appearance of the automobile, so that the finish coat for decorating the automobile develops towards the directions of high definition, high distinctness of image, high fullness and the like.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problem of poor water resistance of the existing material, a preparation method of the automobile finish is provided.
In order to solve the technical problems, the invention adopts the technical scheme that:
(1) mixing the fluorosilicone resin and the waterborne polyurethane resin according to the mass ratio of 1: 2, carrying out ball milling to obtain a mixture, adding the silicone-acrylic emulsion according to the mass ratio of 1: 1, and continuing ball milling for 1-2 h to obtain a component A;
(2) mixing nano titanium dioxide, graphene and deionized water, performing ultrasonic dispersion for 10-20 min to obtain dispersion, adding BYK-110, and continuing to perform ultrasonic dispersion for 15-20 min to obtain a component B;
(3) respectively weighing 10-20 parts of component A, 1-5 parts of component B, 5-10 parts of silicone-acrylate emulsion, 0.2-0.5 part of defoaming agent, 0.5-0.7 part of curing agent, 0.1-0.3 part of flatting agent and 30-40 parts of deionized water according to parts by weight, uniformly mixing the component A and the silicone-acrylate emulsion to obtain a blend, adding the component B, the defoaming agent, the curing agent, the flatting agent and the deionized water, mixing, dispersing at a high speed, and grinding for 10-20 min to obtain the automobile finish.
The ball milling in the step (1) is carried out for 1-2 h at a stirring speed of 100-200 r/min and a ball-material ratio of 3: 1.
The mass ratio of the nano titanium dioxide, the graphene and the deionized water in the step (2) is 1: 10.
The mass ratio of BYK-110 to the dispersion liquid in the step (2) is 1: 10.
The defoaming agent in the step (3) is an organic silicon defoaming agent BYK-141.
The curing agent in the step (3) is any one of hexamethylene diisocyanate biuret, HDI trimer and isophorone diisocyanate trimer.
The leveling agent in the step (3) is any one of BYK-353, 355 and 358, EFKA-3775 and 3778 and BYK-306.
And (4) dispersing at high speed in the step (3) for 30-50 min at the rotating speed of 4000-5000 r/min.
Compared with other methods, the method has the beneficial technical effects that:
(1) according to the invention, the waterborne polyurethane and the fluorosilicone resin are blended and modified to prepare the automobile finish with better hydrophobicity, and the prepared automobile finish not only has the high-strength mechanical property of single-component polyurethane, but also has high gloss, low curing temperature, excellent acid and alkali resistance, excellent salt spray resistance and excellent weather resistance; the polyurethane resin has better hydrophobicity than polyacrylic resin, so that part of sensitivity to water molecules caused by introduction of amino groups can be offset, and the fluorosilicone resin has excellent temperature resistance, anti-adhesion, chemical resistance, antifouling property and decoration;
(2) according to the invention, silicone-acrylic emulsion is used for modification, the silicone-acrylic emulsion is an emulsion obtained by adding an organic silicon monomer containing an unsaturated bond and an acrylic monomer into a proper auxiliary agent and polymerizing through a core-shell coating polymerization process, and the prepared automobile finish has good weather resistance by combining the high temperature resistance, weather resistance, chemical resistance, hydrophobicity, low surface energy and low pollution resistance of organic silicon and the high color retention, flexibility and adhesiveness of acrylic resin;
(3) the curing agent of the invention is isocyanate compound, has good compatibility with various resins and solvents, and has relatively low sensitivity to moisture in air, thus avoiding the defect of paint film caused by high humidity and having high drying speed.
Detailed Description
Mixing the fluorosilicone resin and the waterborne polyurethane resin according to the mass ratio of 1: 2, ball-milling for 1-2 hours at the stirring speed of 100-200 r/min and the ball-to-material ratio of 3: 1 to obtain a mixture, adding the silicone-acrylic emulsion according to the mass ratio of 1: 1, and continuing ball-milling for 1-2 hours to obtain a component A; mixing nano titanium dioxide, graphene and deionized water according to the mass ratio of 1: 10, performing ultrasonic dispersion for 10-20 min to obtain dispersion, adding BYK-110 according to the mass ratio of 1: 10, and continuing to perform ultrasonic dispersion for 15-20 min to obtain a component B; respectively weighing 10-20 parts of component A, 1-5 parts of component B, 5-10 parts of silicone-acrylate emulsion, 0.2-0.5 part of defoaming agent, 0.5-0.7 part of curing agent, 0.1-0.3 part of flatting agent and 30-40 parts of deionized water according to parts by weight, uniformly mixing the component A and the silicone-acrylate emulsion to obtain a blend, adding the component B, the defoaming agent, the curing agent, the flatting agent and the deionized water, mixing, dispersing at a high speed of 4000-5000 r/min for 30-50 min, and grinding for 10-20 min to obtain the automobile finish.
Example 1
Mixing the fluorosilicone resin and the waterborne polyurethane resin according to the mass ratio of 1: 2, ball-milling for 1h at the stirring speed of 100r/min and the ball-to-material ratio of 3: 1 to obtain a mixture, adding the silicone-acrylic emulsion according to the mass ratio of 1: 1, and continuing ball-milling for 1h to obtain a component A; mixing nano titanium dioxide, graphene and deionized water according to the mass ratio of 1: 10, performing ultrasonic dispersion for 10min to obtain dispersion, adding BYK-110 according to the mass ratio of 1: 10, and continuing to perform ultrasonic dispersion for 15min to obtain a component B; respectively weighing 10 parts of component A, 1 part of component B, 5 parts of silicone-acrylate emulsion, 0.2 part of defoaming agent, 0.5 part of curing agent, 0.1 part of flatting agent and 30 parts of deionized water according to parts by weight, uniformly mixing the component A and the silicone-acrylate emulsion to obtain a blend, adding the component B, the defoaming agent, the curing agent, the flatting agent and the deionized water, mixing, dispersing at a high speed of 4000r/min for 30min, and grinding for 10min to obtain the automobile finish.
Example 2
Mixing the fluorosilicone resin and the waterborne polyurethane resin according to the mass ratio of 1: 2, ball-milling for 1h at the stirring speed of 150r/min and the ball-to-material ratio of 3: 1 to obtain a mixture, adding the silicone-acrylic emulsion according to the mass ratio of 1: 1, and continuing ball-milling for 1h to obtain a component A; mixing nano titanium dioxide, graphene and deionized water according to the mass ratio of 1: 10, performing ultrasonic dispersion for 15min to obtain dispersion, adding BYK-110 according to the mass ratio of 1: 10, and continuing to perform ultrasonic dispersion for 18min to obtain a component B; respectively weighing 15 parts of component A, 3 parts of component B, 8 parts of silicone-acrylate emulsion, 0.3 part of defoaming agent, 0.6 part of curing agent, 0.2 part of flatting agent and 35 parts of deionized water according to parts by weight, uniformly mixing the component A and the silicone-acrylate emulsion to obtain a blend, adding the component B, the defoaming agent, the curing agent, the flatting agent and the deionized water, mixing, dispersing at a high speed of 4500r/min for 40min, and grinding for 15min to obtain the automobile finish.
Example 3
Mixing the fluorosilicone resin and the waterborne polyurethane resin according to the mass ratio of 1: 2, ball-milling for 2 hours at the stirring speed of 200r/min and the ball-to-material ratio of 3: 1 to obtain a mixture, adding the silicone-acrylic emulsion according to the mass ratio of 1: 1, and continuing ball-milling for 2 hours to obtain a component A; mixing nano titanium dioxide, graphene and deionized water according to the mass ratio of 1: 10, performing ultrasonic dispersion for 20min to obtain dispersion, adding BYK-110 according to the mass ratio of 1: 10, and continuing to perform ultrasonic dispersion for 20min to obtain a component B; respectively weighing 20 parts of the component A, 5 parts of the component B, 10 parts of silicone-acrylate emulsion, 0.5 part of defoaming agent, 0.7 part of curing agent, 0.3 part of flatting agent and 40 parts of deionized water according to parts by weight, uniformly mixing the component A and the silicone-acrylate emulsion to obtain a blend, adding the component B, the defoaming agent, the curing agent, the flatting agent and the deionized water, mixing, dispersing at a high speed of 5000r/min for 50min, and grinding for 20min to obtain the automobile finish.
Comparative example: automobile finish paint produced by Dongguan company.
The automobile finish prepared in the examples and the comparative examples is detected, and the detection is as follows:
water resistance: testing according to GB/T4893.1-2005 standard.
Impact resistance: tested according to GB/T1732-1993 standard.
The specific test results are shown in table 1.
Table 1 comparative table of property characterization
| Detecting items | Example 1 | Example 2 | Example 3 | Comparative example |
| Water resistance/10 days | Without change | Without change | Without change | Foaming |
| Impact resistance/kg cm | 50 | 50 | 50 | 20 |
As can be seen from Table 1, the automotive topcoat prepared by the present invention has good water resistance and impact resistance.
Claims (7)
1. A preparation method of automobile finish paint is characterized by comprising the following specific preparation steps:
(1) mixing the fluorosilicone resin and the waterborne polyurethane resin according to the mass ratio of 1: 2, ball-milling for 1-2 hours at the stirring speed of 100-200 r/min and the ball-to-material ratio of 3: 1 to obtain a mixture, adding the silicone-acrylic emulsion according to the mass ratio of 1: 1, and continuing ball-milling for 1-2 hours to obtain a component A;
(2) mixing nano titanium dioxide, graphene and deionized water, performing ultrasonic dispersion for 10-20 min to obtain dispersion, adding BYK-110, and continuing to perform ultrasonic dispersion for 15-20 min to obtain a component B;
(3) respectively weighing 10-20 parts of component A, 1-5 parts of component B, 5-10 parts of silicone-acrylate emulsion, 0.2-0.5 part of defoaming agent, 0.5-0.7 part of curing agent, 0.1-0.3 part of flatting agent and 30-40 parts of deionized water according to parts by weight, uniformly mixing the component A and the silicone-acrylate emulsion to obtain a blend, adding the component B, the defoaming agent, the curing agent, the flatting agent and the deionized water, mixing, dispersing at a high speed, and grinding for 10-20 min to obtain the automobile finish.
2. The preparation method of the automobile finish paint according to claim 1, characterized by comprising the following steps: the mass ratio of the nano titanium dioxide, the graphene and the deionized water in the step (2) is 1: 10.
3. The preparation method of the automobile finish paint according to claim 1, characterized by comprising the following steps: the mass ratio of BYK-110 to the dispersion liquid in the step (2) is 1: 10.
4. The preparation method of the automobile finish paint according to claim 1, characterized by comprising the following steps: the defoaming agent in the step (3) is an organic silicon defoaming agent BYK-141.
5. The preparation method of the automobile finish paint according to claim 1, characterized by comprising the following steps: the curing agent in the step (3) is any one of hexamethylene diisocyanate biuret, HDI trimer and isophorone diisocyanate trimer.
6. The preparation method of the automobile finish paint according to claim 1, characterized by comprising the following steps: the leveling agent in the step (3) is any one of BYK-353, 355 and 358, EFKA-3775 and 3778 and BYK-306.
7. The preparation method of the automobile finish paint according to claim 1, characterized by comprising the following steps: and (4) dispersing at high speed in the step (3) for 30-50 min at the rotating speed of 4000-5000 r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811266444.4A CN109608960B (en) | 2018-10-29 | 2018-10-29 | Preparation method of automobile finish |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811266444.4A CN109608960B (en) | 2018-10-29 | 2018-10-29 | Preparation method of automobile finish |
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| CN109608960A CN109608960A (en) | 2019-04-12 |
| CN109608960B true CN109608960B (en) | 2021-05-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112300681A (en) * | 2020-10-26 | 2021-02-02 | 清远市蓝林新材料有限公司 | Polyurethane coating for mirror frame surface processing and preparation method thereof |
| CN113667365A (en) * | 2021-07-20 | 2021-11-19 | 安徽朗凯奇防水科技股份有限公司 | Acid rain resistant exterior wall paint and preparation method thereof |
Citations (4)
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|---|---|---|---|---|
| CN103589310A (en) * | 2012-08-13 | 2014-02-19 | 中国石油天然气集团公司 | Durable polyurethane finish capable of resisting marine-atmosphere environment, and preparation method thereof |
| CN104178013A (en) * | 2014-09-09 | 2014-12-03 | 江苏美亿晨新材料科技有限公司 | Environment-friendly water-based nano varnish and preparation method |
| CN105505059A (en) * | 2015-12-29 | 2016-04-20 | 浙江名匠实业股份有限公司 | Water-borne fluoride-silicone-acrylic nano-sol super-weatherproof stain-resistant coating and preparation method thereof |
| CN107523199A (en) * | 2017-07-26 | 2017-12-29 | 福建格林春天新材料股份有限公司 | A kind of novel aqueous car surface paint |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015126370A1 (en) * | 2014-02-18 | 2015-08-27 | Hewlett-Packard Development Company, L.P. | Finishing method for a metal surface |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589310A (en) * | 2012-08-13 | 2014-02-19 | 中国石油天然气集团公司 | Durable polyurethane finish capable of resisting marine-atmosphere environment, and preparation method thereof |
| CN104178013A (en) * | 2014-09-09 | 2014-12-03 | 江苏美亿晨新材料科技有限公司 | Environment-friendly water-based nano varnish and preparation method |
| CN105505059A (en) * | 2015-12-29 | 2016-04-20 | 浙江名匠实业股份有限公司 | Water-borne fluoride-silicone-acrylic nano-sol super-weatherproof stain-resistant coating and preparation method thereof |
| CN107523199A (en) * | 2017-07-26 | 2017-12-29 | 福建格林春天新材料股份有限公司 | A kind of novel aqueous car surface paint |
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