CN110564235B - Water-based acrylic amino baking paint and preparation method thereof - Google Patents
Water-based acrylic amino baking paint and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of coatings, and particularly discloses a water-based acrylic amino baking varnish and a preparation method thereof. The water-based acrylic amino baking varnish comprises the following raw material components in percentage by mass: 25-35% of water-based acrylic resin; 3-7% of amino resin; 0.1-0.5% of graphene; 2-4% of alumina; 2-4% of aluminum nitride; 1.5 to 2.1 percent of pH regulator; 10-15% of cosolvent; 0.1 to 0.5 percent of defoaming agent; 1-3% of a dispersant; 0.1 to 0.5 percent of wetting agent; 0.1 to 0.5 percent of flatting agent; 1-2% of adhesion promoter; 30-38% of deionized water. The water-based acrylic amino baking paint provided by the invention has the advantages of high paint film hardness, good adhesive force, good weather resistance, water resistance, salt water resistance and heat resistance, and can achieve good heat conduction and heat dissipation effects.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a water-based acrylic amino baking varnish and a preparation method thereof.
Background
With the development of economy in China, automobiles are increasingly used as important transportation means. However, with the improvement of domestic consumption level and quality of life, people's requirements for automobiles no longer satisfy simple transportation tools, and most of the requirements are more focused on driving pleasure and vehicle performance besides some requirements for pursuing luxury and comfort. The dynamic property, the economical efficiency, the stability and the environmental protection property of the automobile are mainly determined by an automobile engine, and the automobile engine is a device for providing power for the automobile and is the heart of the automobile.
Automotive engines are machines that convert thermal energy into mechanical energy. However, only one third of the heat energy generated by the engine is effectively utilized, most of the rest heat energy is taken away by the exhaust gas, and the rest heat energy is absorbed by engine parts. Therefore, to ensure the stability of the performance of the automobile, the automobile engine needs to dissipate heat in time. If the heat dissipation of an automobile engine is poor, the following conditions are easily caused: the water temperature meter of the engine is displayed too high, so that the noise of the engine is increased, and the engine has abnormal sound; decreasing the charging efficiency, resulting in a decrease in the power of the engine; the normal clearance of the moving part is damaged, and the part can not move normally and even is damaged; the lubrication condition is worsened, and the friction and the abrasion of parts are aggravated; the mechanical properties of the metal material are reduced, resulting in deformation or damage of the parts.
The existing engine and related parts thereof are all made of aluminum or cast iron, and a paint film is sprayed on the surfaces of the engine and the related parts thereof for the purposes of protection and beauty. Traditional paint films are disadvantageous to engine heat dissipation, and therefore, the development of novel engine coatings with good heat dissipation is a key content for prolonging the service life of an engine. In addition, based on the use environment of the engine, the paint film is also required to have properties such as water resistance, heat resistance, corrosion resistance, and excellent adhesion. However, the existing water paint is not ideal in combining the performances, and cannot meet the use requirement of an automobile engine.
Disclosure of Invention
Aiming at the technical current situation of the existing water paint, the invention provides the water-based acrylic amino baking paint and the preparation method thereof.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the water-based acrylic amino baking varnish comprises the following raw material components in percentage by mass: 25-35% of water-based acrylic resin; 3-7% of amino resin; 0.1-0.5% of graphene; 2-4% of alumina; 2-4% of aluminum nitride; 1.5 to 2.1 percent of pH regulator; 10-15% of cosolvent; 0.1 to 0.5 percent of defoaming agent; 1-3% of a dispersant; 0.1 to 0.5 percent of wetting agent; 0.1 to 0.5 percent of flatting agent; 1-2% of adhesion promoter; 30-38% of deionized water.
Compared with the prior art, the water-based acrylic amino baking paint provided by the invention adopts water-based acrylic resin as a main film forming substance and amino resin as an auxiliary for crosslinking and curing to form a film, so that the paint film has good adhesive force, heat resistance, weather resistance, chemical resistance and flexibility. Meanwhile, graphene and aluminum oxide are compounded for use, a good heat conduction network is formed in the paint film by utilizing the effective lapping effect of the graphene and the aluminum oxide, and a good thermal channel is formed by filling aluminum nitride and the heat conduction network, so that the rapid heat transfer is realized, and the integral heat conductivity of the paint film is improved. In addition, the graphene, the water-based acrylic resin and the amino resin are crosslinked and cured to form a three-dimensional network structure, redundant amino and carboxyl in the acrylic resin and the amino resin are consumed together with the aluminum oxide, so that the heat conduction network is uniformly dispersed in the paint film, the weather resistance, the water resistance, the salt water resistance and the wear resistance of the paint film are improved, and the aluminum nitride and the aluminum oxide are filled in the paint film simultaneously, so that the paint film has excellent high temperature resistance and fire resistance.
Further, the amino resin is prepared from the following components in a mass ratio of 2-4:1-3 mixtures of highly imino melamine formaldehyde resins (CYMEL 327) with fully methylated melamine formaldehyde resins (MR-603). The amino resin, the acrylic resin containing hydroxyl, carboxyl and amido and the graphene are crosslinked and cured to obtain a three-dimensional network structure, and the three-dimensional network structure has good adhesive force, heat resistance, water resistance and mechanical properties. The high imino group melamine formaldehyde resin has very high reaction activity and self-condensation tendency at normal baking temperature; the fully methylated melamine formaldehyde resin has low reaction speed and easy control, and the reaction speed can be controlled and the paint film performance can be improved while the reaction activity is improved by using the fully methylated melamine formaldehyde resin and the fully methylated melamine formaldehyde resin in a matching way.
Furthermore, the graphene is amino modified graphene oxide, can react with the waterborne acrylic resin more easily, is in lap joint with alumina to form a good heat conducting network, is beneficial to consuming redundant amino and carboxyl in the acrylic resin and amino resin, and improves the water resistance, wear resistance and heat conductivity of the paint film.
Further, the alumina is carboxyl functionalized Al 2 O 3 The nano microspheres have the diameter of 100-200nm, are easier to lap joint with graphene to form a good heat conduction network, easily consume redundant amino and carboxyl in acrylic resin and amino resin, are tightly connected with a three-dimensional network structure, and further improve the heat conductivity, high temperature resistance and heat resistance of a paint filmAnd (4) fire property.
Further, the antifoaming agent is a non-silicone based antifoaming agent (Tego 830). The non-organic silicon defoaming agent belongs to a water-based organic polymer, does not contain organic silicon, contains fumed silica, has high compatibility and good defoaming and foam inhibiting effects, and the fumed silica contained in the non-organic silicon defoaming agent is favorable for improving the high temperature resistance and the flame retardance of a paint film.
Furthermore, the dispersing agent is an aqueous solution containing a high pigment affinity group polymer and a surfactant, such as TEGO Dispers 760W, which is beneficial to reducing the grinding viscosity, so that the system is dispersed more uniformly, and the graphene and the water-based acrylic resin are favorably reacted to form a heat conducting network.
Furthermore, the cosolvent is ethylene glycol monobutyl ether, the pH regulator is dimethylethanolamine, an alkaline environment is provided for acrylic resin reaction, and the acrylic resin, aluminum oxide and graphene can form a heat conduction network conveniently.
Furthermore, the wetting agent is polyether siloxane copolymer (TEGO Wet 280), has a good flow promoting effect, is matched with a cosolvent for use, and has good compatibility and a good atomization effect during spraying.
Furthermore, the leveling agent is acrylic acid flowing and leveling agent (PW-336), and is used for improving the leveling and flowing and improving the substrate wettability under the combined action of a wetting agent; and the defoaming agent is used together to eliminate shrinkage cavities and fish eyes and reduce orange peels and pinholes.
Furthermore, the adhesion promoter is a water-based adhesion promoter 2504, does not contain polysiloxane nonionic compounds, improves the paint film adhesion, and enhances the ductility, impact resistance and salt spray resistance of the paint film.
The invention also provides a preparation method of the water-based acrylic amino baking varnish, which comprises the following steps:
(1) Mixing the cosolvent with deionized water to obtain a mixed solvent;
(2) Dispersing the aluminum oxide and the aluminum nitride by 60-80% of the mixed solvent, and mixing the aluminum oxide and the aluminum nitride with the aqueous acrylic resin, the graphene, the pH regulator and the dispersant to obtain a first mixed material;
(3) Diluting the defoaming agent and the wetting agent with the rest of the mixed solvent, and mixing the mixture with the amino resin, the leveling agent and the adhesion promoter to obtain a second mixed material;
(4) And after oscillating and stirring the first mixed material, mixing the first mixed material with the second mixed material to obtain the water-based acrylic amino baking paint.
Specifically, the system is weakly alkaline (pH = 8.0-8.5) under the action of a pH regulator, the aqueous acrylic resin is more hydrophilic under the condition of weak alkalinity, graphene and aluminum oxide are added into the system as fillers, and through vibration stirring, carboxyl groups, aluminum oxide and hydroxyl groups on the graphene on the acrylic resin are enabled to act together to form a heat conduction network which is wrapped by the acrylic resin and is mixed with granular aluminum oxide among graphene sheet layer structures, wherein the aluminum oxide is used as a substance for connecting graphene layers and interlayers and penetrates through the graphene layers in a synergistic effect with aluminum nitride, the heat conduction efficiency of the graphene is improved, and the heat conductivity of a paint film is improved. And then, mixing the paint with amino resin, and crosslinking and curing the amino resin, the water-based acrylic resin and the graphene together to obtain a paint film with excellent adhesive force, thermal conductivity, high temperature resistance, water resistance, fire resistance and other properties.
Further, in the steps (2) and (3), the mixing speed of the mixing treatment is 1200-1500r/min, and the time is 5-8min, so that the components are fully mixed, and the graphene, the aluminum oxide and the aluminum nitride are uniformly dispersed in a coating system.
Further, in the step (3), after shaking and stirring for 0.5-1.5h, cooling the system to room temperature, and then repeatedly shaking and stirring until the fineness of the system is less than or equal to 15 μm, so that the aluminum oxide and the graphene form a heat conduction network, and the uniformity of the system is ensured.
Compared with the prior art, the preparation method of the water-based acrylic amino baking varnish provided by the invention has the advantages of simple process, simple and convenient operation, greenness and safety, and the prepared water-based acrylic amino baking varnish can be well attached to the surface of a base material, can achieve good heat dissipation effect and has good heat resistance and water resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The water-based acrylic amino baking varnish comprises the following raw material components in percentage by mass: 30 percent of waterborne acrylic resin PJ 6257-70; amino resin CYMEL 327 was 4%; the amino resin MR-603 is 3 percent; 0.5% of graphene; 3% of aluminum oxide; 3% of aluminum nitride; 1.8% of dimethylethanolamine; ethylene glycol butyl ether 12%; 0.4% of antifoaming agent Tego 830; dispersant TEGO Dispers 760W is 2.5%; wetting agent TEGO Wet 280 is 0.4%; 0.4% of flatting agent PW-336; aqueous adhesion promoter 2504 is 2%; and 37% of deionized water.
The preparation method of the water-based acrylic amino baking varnish comprises the following steps:
(1) Mixing the ethylene glycol monobutyl ether with deionized water to obtain a mixed solvent;
(2) Dispersing the alumina and the aluminum nitride by 70 percent of the obtained mixed solvent, mixing the mixture with water-based acrylic resin PJ6257-70, graphene, dimethylethanolamine and a dispersant TEGO Dispers 760W, and stirring at 1400r/min for 6min to obtain a first mixed material;
(3) Diluting the defoaming agent Tego830 and the wetting agent TEGO Wet 280 by using the residual mixed solvent, mixing the mixture with amino resin CYMEL 327, amino resin MR-603, a leveling agent PW-336 and a water-based adhesion promoter 2504, and stirring the mixture at 1400r/min for 6min to obtain a second mixed material;
(4) And (3) after the first mixed material is stirred for 1 hour in a shaking way, cooling the system to room temperature, then repeatedly stirring in a shaking way until the fineness of the system is less than or equal to 15 mu m, and then mixing with the second mixed material to obtain the waterborne acrylic amino baking varnish.
Example 2
The water-based acrylic amino baking varnish comprises the following raw material components in percentage by mass: 25% of waterborne acrylic resin PJ 6257-70; amino resin CYMEL 327 was 4%; the amino resin MR-603 is 3 percent; 0.4% of graphene; 4% of aluminum oxide; 4% of aluminum nitride; 2.1% of dimethylethanolamine; ethylene glycol butyl ether 15%; 0.5% of antifoaming agent Tego 830; dispersant TEGO Dispers 760W is 1%; wetting agent TEGO Wet 280 is 0.5%; 0.5 percent of flatting agent PW-336; aqueous adhesion promoter 2504 is 2%; and 38% of deionized water.
The preparation method of the water-based acrylic amino baking varnish comprises the following steps:
(1) Mixing the ethylene glycol monobutyl ether with deionized water to obtain a mixed solvent;
(2) Dispersing the aluminum oxide and the aluminum nitride by 60% of the obtained mixed solvent, mixing the mixture with water-based acrylic resin PJ6257-70, graphene, dimethylethanolamine and a dispersant TEGO Dispers 760W, and stirring at 1200r/min for 8min to obtain a first mixed material;
(3) Diluting the defoaming agent Tego830 and the wetting agent TEGO Wet 280 by using the residual mixed solvent, mixing the mixture with amino resin CYMEL 327, amino resin MR-603, a leveling agent PW-336 and a water-based adhesion promoter 2504, and stirring the mixture at 1200r/min for 8min to obtain a second mixed material;
(4) And (3) after the first mixed material is subjected to oscillation stirring for 0.5h, cooling the system to room temperature, repeating oscillation stirring until the fineness of the system is less than or equal to 15 mu m, and mixing with the second mixed material to obtain the water-based acrylic amino baking paint.
Example 3
The water-based acrylic amino baking varnish comprises the following raw material components in percentage by mass: 35% of water-based acrylic resin PJ 6257-70; amino resin CYMEL 327 was 2%; the amino resin MR-603 is 1 percent; 0.1% of amino modified graphene oxide; carboxyl-functionalized Al 2 O 3 2% of nano-microspheres (200 nm); 2% of aluminum nitride; 1.5% of dimethylethanolamine; ethylene glycol butyl ether 14.1%; 0.1% of antifoaming agent Tego 830; dispersant TEGO Dispers 760W is 3%; wetting agent TEGO Wet 280 is 0.1%; 0.1 percent of flatting agent PW-336; aqueous adhesion promoter 2504 is 1%; 30-38% of deionized water.
The preparation method of the water-based acrylic amino baking varnish comprises the following steps:
(1) Mixing the ethylene glycol monobutyl ether with deionized water to obtain a mixed solvent;
(2) Dispersing the alumina and the aluminum nitride by 80% of the obtained mixed solvent, mixing with water-based acrylic resin PJ6257-70, graphene, dimethylethanolamine and a dispersant TEGO Dispers 760W, and stirring at 1500r/min for 5min to obtain a first mixed material;
(3) Diluting the defoaming agent Tego830 and the wetting agent TEGO Wet 280 by using the residual mixed solvent, mixing the mixture with amino resin CYMEL 327, amino resin MR-603, a leveling agent PW-336 and a water-based adhesion promoter 2504, and stirring the mixture at 1500r/min for 5min to obtain a second mixed material;
(4) And (3) after the first mixed material is stirred for 1.5 hours in a shaking way, cooling the system to room temperature, then repeatedly stirring in a shaking way until the fineness of the system is less than or equal to 15 mu m, and then mixing with the second mixed material to obtain the water-based acrylic amino baking paint.
Example 4
The water-based acrylic amino baking varnish comprises the following raw material components in percentage by mass: 35% of water-based acrylic resin PJ 6257-70; amino resin CYMEL 327 at 3.8%; the amino resin MR-603 is 2.7 percent; 0.5% of graphene; 4% of aluminum oxide; 4% of aluminum nitride; 2% of dimethylethanolamine; 10% of ethylene glycol butyl ether; 0.5% of antifoaming agent Tego 830; dispersant TEGO Dispers 760W is 1%; wetting agent TEGO Wet 280 is 0.5%; 0.5 percent of flatting agent PW-336; aqueous adhesion promoter 2504 is 1.5%; and 34% of deionized water.
The preparation method of the water-based acrylic amino baking varnish comprises the following steps:
(1) Mixing the ethylene glycol monobutyl ether with deionized water to obtain a mixed solvent;
(2) Dispersing 75% of the obtained mixed solvent into the alumina and the aluminum nitride, mixing the alumina and the aluminum nitride with water-based acrylic resin PJ6257-70, graphene, dimethylethanolamine and a dispersant TEGO Dispers 760W, and stirring at 1300r/min for 7min to obtain a first mixed material;
(3) Diluting the defoaming agent Tego830 and the wetting agent TEGO Wet 280 by using the residual mixed solvent, mixing the mixture with amino resin CYMEL 327, amino resin MR-603, a leveling agent PW-336 and a water-based adhesion promoter 2504, and stirring for 7min at 1300r/min to obtain a second mixed material;
(4) And (3) after the first mixed material is stirred for 1 hour in a shaking way, cooling the system to room temperature, then repeatedly stirring in a shaking way until the fineness of the system is less than or equal to 15 mu m, and then mixing with the second mixed material to obtain the waterborne acrylic amino baking varnish.
Example 5
The water-based acrylic amino baking varnish comprises the following raw material components in percentage by mass: 33% of water-based acrylic resin PJ 6257-70; amino resin CYMEL 327 was 4%; the amino resin MR-603 is 3 percent; 0.5% of graphene; 3% of aluminum oxide; 3% of aluminum nitride; 2% of dimethylethanolamine; ethylene glycol butyl ether 15%; 0.5% of antifoaming agent Tego 830; dispersant TEGO Dispers 760W is 3%; wetting agent TEGO Wet 280 is 0.5%; 0.5 percent of flatting agent PW-336; aqueous adhesion promoter 2504 is 2%; 30% of deionized water.
The preparation method of the water-based acrylic amino baking varnish comprises the following steps:
(1) Mixing the ethylene glycol monobutyl ether with deionized water to obtain a mixed solvent;
(2) Dispersing the aluminum oxide and the aluminum nitride by using 65% of the obtained mixed solvent, mixing the aluminum oxide and the aluminum nitride with water-based acrylic resin PJ6257-70, graphene, dimethylethanolamine and a dispersant TEGO Dispers 760W, and stirring at 1200r/min for 8min to obtain a first mixed material;
(3) Diluting the defoaming agent Tego830 and the wetting agent TEGO Wet 280 by using the residual mixed solvent, mixing the mixture with amino resin CYMEL 327, amino resin MR-603, a leveling agent PW-336 and a water-based adhesion promoter 2504, and stirring for 8min at 1200r/min to obtain a second mixed material;
(4) And (3) after the first mixed material is subjected to oscillation stirring for 0.5h, cooling the system to room temperature, repeating oscillation stirring until the fineness of the system is less than or equal to 15 mu m, and mixing with the second mixed material to obtain the water-based acrylic amino baking paint.
In order to better illustrate the technical solution of the present invention, further comparison is made below by means of a comparative example and an example of the present invention.
Comparative example 1
The graphene in the example 1 is replaced by the same amount of deionized water, and other components and preparation methods are the same as those of the example 1, so that the water-based acrylic amino baking paint is prepared.
Comparative example 2
The alumina in example 1 was replaced with the same amount of aluminum nitride, and the other components and preparation method were the same as in example 1 to prepare an aqueous acrylic amino baking varnish.
Comparative example 3
The aluminum nitride in example 1 was replaced with the same amount of zinc oxide, and the other components and preparation method were the same as in example 1 to prepare an aqueous acrylic amino baking varnish.
To better illustrate the characteristics of the waterborne acrylic amino baking paints provided in the examples of the present invention, the waterborne acrylic amino baking paints prepared in example 1 and comparative examples 1-3 were tested for their corresponding properties, and the results are shown in Table 1.
TABLE 1
Note: the material thermal conductivity was tested using a Hot Disk TPS2500 thermal conductivity analyzer.
According to the data, the water-based acrylic amino baking paint provided by the embodiment of the invention has the advantages of high paint film hardness, good adhesive force, good weather resistance, water resistance, salt water resistance and heat resistance, and a heat conductivity coefficient of 2.3, and can achieve good heat conduction and heat dissipation effects. The waterborne acrylic amino baking varnish provided in the embodiments 2-5 of the invention has equivalent technical effect to the baking varnish provided in the embodiment 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The water-based acrylic amino baking paint is characterized in that: comprises the following raw material components in percentage by mass: 25-35% of water-based acrylic resin; 3-7% of amino resin; 0.1-0.5% of graphene; 2-4% of alumina; 2-4% of aluminum nitride; 1.5 to 2.1 percent of pH regulator; 10-15% of cosolvent; 0.1 to 0.5 percent of defoaming agent; 1-3% of a dispersant; 0.1 to 0.5 percent of wetting agent; 0.1 to 0.5 percent of flatting agent; 1-2% of adhesion promoter; 30-38% of deionized water;
the graphene is amino-modified graphene oxide;
the amino resin is prepared from the following components in a mass ratio of 2-4:1-3 mixtures of a highly imino melamine formaldehyde resin and a fully methylated melamine formaldehyde resin.
2. The aqueous acrylic amino baking varnish according to claim 1, wherein: the alumina is carboxyl functionalized Al 2 O 3 And (4) nano microspheres.
3. The aqueous acrylic amino baking varnish according to claim 1, wherein: the defoaming agent is a non-organic silicon defoaming agent.
4. The aqueous acrylic amino baking varnish according to claim 1, wherein: the wetting agent is a polyether siloxane copolymer.
5. The aqueous acrylic amino baking varnish according to claim 1, wherein: the leveling agent is an acrylic acid flowing and leveling agent.
6. A method for preparing the water-based acrylic amino baking varnish according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
(1) Mixing the cosolvent with deionized water to obtain a mixed solvent;
(2) Dispersing the aluminum oxide and the aluminum nitride by 60-80% of the mixed solvent, and mixing the aluminum oxide and the aluminum nitride with the aqueous acrylic resin, the graphene, the pH regulator and the dispersant to obtain a first mixed material;
(3) Diluting the defoaming agent and the wetting agent with the rest of the mixed solvent, and mixing the mixture with the amino resin, the leveling agent and the adhesion promoter to obtain a second mixed material;
(4) And after the first mixed material is vibrated and stirred, mixing the first mixed material with the second mixed material to obtain the water-based acrylic amino baking paint.
7. The method for preparing the aqueous acrylic amino baking varnish according to claim 6, wherein the method comprises the following steps: in the steps (2) and (3), the mixing speed of the mixed material treatment is 1200-1500r/min, and the time is 5-8min.
8. The method for preparing the aqueous acrylic amino baking varnish according to claim 6, wherein: in the step (4), after shaking and stirring for 0.5-1.5h, cooling the system to room temperature, and then repeatedly shaking and stirring until the fineness of the system is less than or equal to 15 mu m.
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| CN111040549B (en) * | 2019-12-27 | 2023-03-28 | 石家庄市油漆厂 | Water-based amino paint for metal surface with oil and preparation method thereof |
| CN111234608A (en) * | 2020-01-12 | 2020-06-05 | 惠州市兴鸿昌电器有限公司 | Water-based electric heating carbon paste |
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| CN112876927B (en) * | 2021-02-23 | 2022-04-12 | 福州大学 | Corrosion-resistant water-based amino baking paint and preparation method thereof |
| CN113061379B (en) * | 2021-03-29 | 2022-04-12 | 福州大学 | Water-based high-hardness corrosion-resistant amino baking paint |
| CN113817370A (en) * | 2021-08-25 | 2021-12-21 | 武汉海翎化学工业有限公司 | High-washing-resistance solvent-free acrylic baking paint and preparation method thereof |
| CN116769367A (en) * | 2023-03-23 | 2023-09-19 | 紫荆花涂料（上海）有限公司 | Water-based graphene amino baking varnish and preparation method and application thereof |
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