阅读说明：本技术 一种超耐磨电泳漆色漆树脂及其制备方法 (Super-wear-resistant electrophoretic paint colored paint resin and preparation method thereof ) 是由 万涛 章树芳 杜建伟 刘元 雷坤 陈文俊 于 2021-10-15 设计创作，主要内容包括：本发明属于电泳漆制备技术领域,一种超耐磨电泳漆色漆树脂,主要包括以下重量百分比的组分：端氨基液态丁腈橡胶1-10％；聚醚多元醇缩水甘油醚2-8％；引发剂1％-5％；溶剂10-24％；成膜助剂1-5％；聚醚硅氧烷0.05-1％；固化剂4-10％；乳酸3-8％；乳化剂0.1-3％；颜填料3-15％；水10-50％,本发明通过将端氨基液态丁腈橡胶与引发剂的相互作用进行氧化聚合反应,再使端氨基液态丁腈橡胶中的端胺基与聚醚多元醇缩水甘油醚中的环氧基发生反应,形成改性橡胶树脂,并将其制备形成电泳漆树脂,能够大大提高电泳漆树脂柔韧性和耐磨性,提高电泳漆的耐冲击性。(The invention belongs to the technical field of electrophoretic paint preparation, and discloses a super-wear-resistant electrophoretic paint colored paint resin which mainly comprises the following components in percentage by weight: 1-10% of amino-terminated liquid nitrile rubber; 2-8% of polyether polyol glycidyl ether; 1% -5% of an initiator; 10-24% of a solvent; 1-5% of film forming auxiliary agent; 0.05 to 1 percent of polyether siloxane; 4-10% of a curing agent; 3-8% of lactic acid; 0.1 to 3 percent of emulsifier; 3-15% of pigment and filler; 10-50% of water, and performing oxidative polymerization reaction by the interaction of the amino-terminated liquid nitrile rubber and an initiator, reacting the amino-terminated group in the amino-terminated liquid nitrile rubber with the epoxy group in the polyether polyol glycidyl ether to form a modified rubber resin, and preparing the modified rubber resin to form the electrophoretic paint resin, so that the flexibility and the wear resistance of the electrophoretic paint resin can be greatly improved, and the impact resistance of the electrophoretic paint is improved.)

1. The super wear-resistant electrophoretic paint color paint resin is characterized in that: the paint mainly comprises the following components in percentage by weight: 1-10% of amino-terminated liquid nitrile rubber; 2-8% of polyether polyol glycidyl ether; 1% -5% of an initiator; 10-24% of a solvent; 1-5% of film forming auxiliary agent; 0.05 to 1 percent of polyether siloxane; 4-10% of a curing agent; 3-8% of lactic acid; 0.1 to 3 percent of emulsifier; 3-15% of pigment and filler; 10-50% of water.

2. The super abrasion resistant electrophoretic paint resin according to claim 1, wherein: the polyether polyol glycidyl ether is one of polypropylene glycol diglycidyl ether and polyethylene glycol diglycidyl ester.

3. The super abrasion resistant electrophoretic paint resin according to claim 1, wherein: the initiator is one of tert-butyl peroxybenzoate, azobisisobutyronitrile and benzoyl peroxide.

4. The super abrasion resistant electrophoretic paint resin according to claim 1, wherein: the solvent comprises methyl isobutyl ketone, butanone and xylene.

5. The super abrasion resistant electrophoretic paint resin according to claim 1, wherein: the film forming assistant comprises one of ethylene glycol hexyl ether and propylene glycol phenyl ether.

6. The super abrasion resistant electrophoretic paint resin according to claim 1, wherein: the curing agent comprises IPDI curing agent and HDI curing agent.

7. The super abrasion resistant electrophoretic paint resin according to claim 1, wherein: the emulsifier comprises one or more of alkylphenol polyoxyethylene, nonylphenol polyoxyethylene, fatty alcohol polyoxyethylene, dinonylphenol polyoxyethylene and sorbitan ester polyoxyethylene.

8. The super abrasion resistant electrophoretic paint resin according to claim 1, wherein: the pigment and filler comprises rubber carbon black and modified nano SiO₂Polytetrafluoroethylene wax powder, kaolin, titanium dioxide and precipitated barium sulfate.

9. The super abrasion resistant electrophoretic paint resin according to claim 6, wherein: the modified nano SiO₂Prepared by the following method: (1) under the protection of nitrogen, adopting a disperser to mix the nano SiO₂Dispersing the particles in toluene for 30min, adding 5% MPS and triethylamine into disperser, mixing, heating to 80 deg.C, condensing and refluxing for 3h, centrifuging with centrifuge to separate out particles, washing with ethanol for 3 times to obtain modified nanometer SiO₂Particles; (2) mps-modified silica particles in a mass ratio of 2: 1: mixing and stirring fluorine-containing acrylic resin for 30min, then dripping 1% of azodiisobutyronitrile into the mixture at a constant speed, reacting for 4h at 70-80 ℃, centrifuging, purifying and drying the product after reaction to obtain the modified nano SiO₂And (3) granules.

10. A preparation method of super wear-resistant electrophoretic paint colored paint resin is characterized by comprising the following steps: the preparation method comprises the following preparation steps:

s1: adding 1-10% of amino-terminated liquid nitrile rubber, 2-8% of solvent and 2-8% of initiator into a reaction kettle, quickly heating to 80-130 ℃, and carrying out heat preservation reaction for 2 hours at 90-130 ℃;

s2: after the reaction of the step S1 is finished and the reaction temperature is controlled at 90 ℃, adding 2-8% of polyether polyol glycidyl ether and 2-8% of methyl isobutyl ketone into a reaction kettle, and carrying out heat preservation reaction for 2 hours at 90-95 ℃;

s3: cooling to 70 ℃, adding 0.05-1% of polyether siloxane, 1-5% of film-forming additive, 2-7% of IPDI curing agent, 2-7% of HDI curing agent, 3-8% of lactic acid and 2-10% of water into the reaction kettle, and keeping the temperature for 1 h;

s4: cooling to 50 deg.C, adding 0.1-3% emulsifier, 0.1-3% wetting agent and 10-40% water, stirring and reacting for 30 min;

s5: and adding rubber carbon black, modified nano-silica, polytetrafluoroethylene wax powder, kaolin, titanium dioxide and precipitated barium sulfate into the reaction kettle, stirring for 30min, sanding the product, and finally obtaining the finished product, wherein the sanding granularity is 10 mu m.

Technical Field

The invention belongs to the technical field of electrophoretic paint preparation, and particularly relates to super-wear-resistant electrophoretic paint colored paint resin and a preparation method thereof.

Background

The electrophoretic coating is a novel coating with low pollution, energy conservation, resource conservation, protection and corrosion resistance, has the characteristics of smooth coating, good water resistance and chemical resistance and the like, is easy to realize the mechanization and automation of the coating industry, is suitable for coating workpieces with edges, corners and holes, and is widely applied to coating hardware such as automobiles, automatic vehicles, electromechanics, household appliances and the like.

The patent of chinese invention with the publication number of CN103951773B discloses a long side chain fluorine-containing acrylic epoxy resin and a coating prepared from the same, but the patent can not only graft and modify with organic fluorine alone and can not achieve the effect of higher friction resistance, and can not solve the technical problems of low adhesion and strength and hardness of electrophoretic paint in the prior art. Meanwhile, in recent years, inorganic particles have been receiving increasing attention due to their excellent properties and wide application, but there are problems in the application of inorganic particles, such as particle aggregation and poor inorganic-organic interfacial energy, which often occur due to their original polar surface characteristics. Therefore, hydrophobic surface modification of inorganic particles to enhance surface characteristics is also a key to their development.

Disclosure of Invention

The invention aims to provide a super-wear-resistant electrophoretic paint colored paint resin and a preparation method thereof.

The technical purpose of the invention is realized by the following technical scheme: the super wear-resistant electrophoretic paint color paint resin mainly comprises the following components in percentage by weight: 1-10% of amino-terminated liquid nitrile rubber; 2-8% of polyether polyol glycidyl ether; 1% -5% of an initiator; 10-24% of a solvent; 1-5% of film forming auxiliary agent; 0.05 to 1 percent of polyether siloxane; 1-5% of film forming auxiliary agent; 4-10% of a curing agent; 3-8% of lactic acid; 0.1 to 3 percent of emulsifier; 3-15% of pigment and filler; 10-50% of water.

The invention is further provided with: the polyether polyol glycidyl ether is one of polypropylene glycol diglycidyl ether and polyethylene glycol diglycidyl ester.

The invention is further provided with: the initiator is one of tert-butyl peroxybenzoate, azobisisobutyronitrile and benzoyl peroxide.

The invention is further provided with: the solvent comprises methyl isobutyl ketone, butanone and xylene.

The invention is further provided with: the film forming assistant comprises one of ethylene glycol hexyl ether and propylene glycol phenyl ether.

The invention is further provided with: the curing agent comprises IPDI curing agent and HDI curing agent.

The invention is further provided with: the emulsifier comprises one or more of alkylphenol polyoxyethylene, nonylphenol polyoxyethylene, fatty alcohol polyoxyethylene, dinonylphenol polyoxyethylene and sorbitan ester polyoxyethylene.

The invention is further provided with: the pigment and filler comprises rubber carbon black, modified nano-silica, polytetrafluoroethylene wax powder, kaolin, titanium dioxide and precipitated barium sulfate.

The invention is further provided with: the modified nano SiO₂Prepared by the following method: (1) under the protection of nitrogen, adopting a disperser to mix the nano SiO₂Dispersing the particles in toluene for 30min, adding 5% MPS and triethylamine into disperser, mixing, heating to 80 deg.C, condensing and refluxing for 3h, centrifuging with centrifuge to separate out particles, washing with ethanol for 3 times to obtain modified nanometer SiO₂Particles; (2) mps-modified silica particles in a mass ratio of 2: 1: mixing and stirring fluorine-containing acrylic resin for 30min, then dripping 1% of azodiisobutyronitrile into the mixture at a constant speed, reacting for 4h at 70-80 ℃, centrifuging, purifying and drying the product after reaction to obtain the modified nano SiO₂And (3) granules.

A preparation method of super wear-resistant electrophoretic paint colored paint resin is characterized by comprising the following steps: the preparation method comprises the following preparation steps:

s1: adding 1-10% of amino-terminated liquid nitrile rubber, 2-8% of solvent and 2-8% of initiator into a reaction kettle, quickly heating to 80-130 ℃, and carrying out heat preservation reaction for 2 hours at 90-130 ℃;

s2: after the reaction of the step S1 is finished and the reaction temperature is controlled at 90 ℃, adding 2-8% of polyether polyol glycidyl ether and 2-8% of methyl isobutyl ketone into a reaction kettle, and carrying out heat preservation reaction for 2 hours at 90-95 ℃;

s3: cooling to 70 ℃, adding 0.05-1% of polyether siloxane, 1-5% of film-forming additive, 2-7% of IPDI curing agent, HDI curing agent, 3-8% of lactic acid and 2-10% of water into the reaction kettle, and keeping the temperature for 1 h;

s4: cooling to 50 deg.C, adding 0.1-3% emulsifier, 0.1-3% wetting agent and 10-40% water, stirring and reacting for 30 min;

s5: and adding rubber carbon black, modified nano-silica, polytetrafluoroethylene wax powder, kaolin, titanium dioxide and precipitated barium sulfate into the reaction kettle, stirring for 30min, sanding the product, and finally obtaining the finished product, wherein the sanding granularity is 10 mu m.

The invention has the beneficial effects that: .

1. The invention achieves the function of enhancing corrosion resistance and provides wear resistance by modifying the rubber resin; the amino-terminated liquid nitrile rubber has a good toughening effect, but the rubber can not be applied to resin and electrophoretic paint resin all the time, the invention carries out oxidative polymerization reaction by the interaction of the amino-terminated liquid nitrile rubber and an initiator, then the terminal amino group in the amino-terminated liquid nitrile rubber reacts with the epoxy group in the polyether polyol glycidyl ether to form modified rubber resin, and the modified rubber resin is prepared to form the electrophoretic paint resin, so that the flexibility and the wear resistance of the electrophoretic paint resin can be greatly improved, the impact resistance of the electrophoretic paint is improved, the proper amino-terminated synthetic rubber resin is selected for modification and then is acidified to form cationic resin, the proper doping proportion is tested, and the wear resistance of the resin is improved.

2. According to the invention, the silicon dioxide is subjected to fluorine modification, the fluorine enrichment on the particle surface is beneficial to improving the hydrophobicity of the particle surface, and compared with unmodified silicon dioxide, the modified silicon dioxide has better ice resistance, so that the weather resistance of the electrophoretic paint is improved, and meanwhile, the modified silicon dioxide can increase the dispersion tension and reduce the polar surface tension. The reduction in polar surface tension is due to the organic chains reducing the interaction of the surface with the polar solvent. Therefore, the surface wettability of the modified silica particles is low, and the silica after modification can cause the phenomenon of aggregation of inorganic particles.

3. The silicon dioxide of the invention forms organic silicon after being modified, so that the glass transition temperature, the decomposition temperature and the corrosion resistance of the electrophoretic paint are improved.

4. The invention can achieve the function of enhancing corrosion resistance and providing wear resistance when being doped with vulcanized rubber resin, meanwhile, the modified silicon dioxide in the invention is beneficial to the crosslinking of rubber, the higher the crosslinking degree is, the higher the tearing strength and the tensile strength of the rubber are, therefore, under the synergistic action of the modified silicon dioxide and the vulcanized rubber, the strength of the synthesized resin is greatly improved, and the weather resistance is enhanced, meanwhile, the crosslinking effect formed between the modified silicon dioxide and rubber molecules improves the crosslinking strength of the rubber, on the other hand, under the action of shearing force, the modified nano silicon dioxide particles can initiate weak silver lines, and simultaneously, the rubber among the particles can also enable the resin to generate plastic deformation, thereby achieving the effect of wear resistance.

5. The invention adds the polytetrafluoroethylene wax powder and the nano silicon dioxide in the matched electrophoretic color paste so as to achieve the purposes of reducing the friction coefficient and increasing the wear resistance.

6. The invention adopts the amine-enclosed HDI crosslinking agent without benzene ring and the methyl ethyl ketoxime-enclosed IPDI crosslinking agent composite system to carry out curing reaction, and ensures that the product has the artificial aging resistance for more than or equal to 500h under a xenon lamp, the content of soft and hard segments in the electrophoretic paint resin can be adjusted by adopting the composite curing agent with proper proportion, and because the reaction product urea bond exists, the intermolecular hydrogen bond acting force can be obviously enhanced, the cohesion of the electrophoretic paint is improved, and the hardness of the electrophoretic paint is improved.

Detailed Description

The technical solutions in the examples will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

The present invention allows the fluorine-containing acrylic resin monomer to be grafted to the surface of silica by azobisisobutyronitrile-initiated free radical polymerization between C ═ C bonds. First, silica is hydrophobically surface-modified with 3-acryloxypropyltrimethoxysilane (MPS) so that C ═ C bonds are present on the silica surface. Then, azobisisobutyronitrile decomposes into radicals to initiate the reaction. During the reaction, the C ═ C bonds from the MPS-modified silica surface are initiated first to form free radicals; the fluoroacrylic resins were also initiated later, contributing to the advancement of chain propagation. The disproportionation reaction is the termination mechanism of the reaction due to the steric effect of the fluorine-containing acrylic resin molecules. Finally, the fluorine-containing acrylic resin is grafted to the silica surface by radical polymerization. The hydrophilic groups of the unmodified silica surface interact more strongly with the polar liquid. The modified silica can increase the dispersion tension and decrease the polar surface tension compared to the unmodified silica. The reduction in polar surface tension is due to the organic chains reducing the interaction of the surface with the polar solvent. Thus, the surface wettability of the modified silica particles is low.

The unmodified particles aggregate severely, while the aggregation of the modified particles is mitigated. Severe aggregation can be attributed to the large specific surface area of the particles and the high surface energy of the hydrophilic surface. Meanwhile, each silica particle has obvious core-shell morphology around the particle. A shell thickness of about 1.5nm can be observed on unmodified silica, which shell can be attributed to the presence of silica and O — H groups. Meanwhile, the shell layer of the MPS modified silicon dioxide particles is not obviously improved, and the thickness of the modified layer is only increased to about 1.61 nm. The modified layer is developed mainly on the surface of the silica containing the active fluorine organic chain, and the modified layer is developed mainly on the surface of the silica containing the active fluorine organic chain. With further modification of the fluorine-containing acrylic resin monomer, the shell thickness of the modified layer of the fluorine-modified silica particles was increased to 4.32 nm. Thicker shells can be observed on the fluorine-modified silica particles compared to unmodified silica. Thus, by transmission electron microscopy analysis, it was also confirmed that the fluorine-containing acrylic resin monomer was successfully grafted onto the silica particles through C ═ C bonds.

Example 1

A preparation method of super wear-resistant electrophoretic paint colored paint resin comprises the following steps:

s1: adding 8% of amino-terminated liquid nitrile rubber, 3% of methyl isobutyl ketone and 5% of tert-butyl peroxybenzoate into a reaction kettle, rapidly heating to 120-;

s2: step S1, after the reaction is finished and the temperature of the reaction is reduced to 90 ℃, adding 8% of polypropylene glycol diglycidyl ether and 5% of methyl isobutyl ketone into a reaction kettle, and carrying out heat preservation reaction for 2 hours at the temperature of 90-95 ℃;

s3: cooling to 70 ℃, adding 0.4% of polyether siloxane, 2% of ethylene glycol hexyl ether, 5% of HDI curing agent, 7% of lactic acid and 2-10% of water into the reaction kettle, and keeping the temperature for 1 h;

s4: cooling to 50 ℃, adding 0.1-3% of alkylphenol polyoxyethylene, 0.1-3% of wetting agent and 10-40% of water, and stirring for reaction for 30 min;

s5: and adding rubber carbon black, kaolin, titanium dioxide and precipitated barium sulfate into the reaction kettle, stirring for 30min, and then sanding the product until the granularity is 10 mu m to finally obtain the electrophoretic paint colored paint.

Example 2

A preparation method of super wear-resistant electrophoretic paint colored paint resin comprises the following steps:

s1: adding 5% of amino-terminated liquid nitrile rubber, 5% of butanone and 6% of benzoyl peroxide into a reaction kettle, quickly heating to 110 ℃, and carrying out heat preservation reaction for 2 hours at 110 ℃;

s2: step S1, after the reaction is finished and the temperature is reduced to 90 ℃, adding 5% of polyether glycol glycidyl ether and 5% of methyl isobutyl ketone into a reaction kettle, and carrying out heat preservation reaction for 2 hours at the temperature of 90-95 ℃;

s3: cooling to 70 ℃, adding 0.1% of polyether siloxane, 2% of propylene glycol phenyl ether, 5% of IPDI curing agent, 6% of lactic acid and 2-10% of water into the reaction kettle, and keeping the temperature for 1 h;

s4: cooling to 50 ℃, adding 2% of fatty alcohol-polyoxyethylene ether, 0.1-3% of wetting agent and 10-40% of water, and stirring to react for 30 min;

s5: and adding rubber carbon black, kaolin, titanium dioxide and precipitated barium sulfate into the reaction kettle, stirring for 30min, and then sanding the product until the granularity is 10 mu m to finally obtain the electrophoretic paint colored paint.

Example 3

A preparation method of super wear-resistant electrophoretic paint colored paint resin comprises the following steps:

s1: adding 2% of amino-terminated liquid nitrile rubber, 3% of butanone and 2-8% of azobisisobutyronitrile into a reaction kettle, quickly heating to 90-100 ℃, and carrying out heat preservation reaction for 2 hours at 100 ℃;

s2: step S1, after the reaction is finished and the temperature is reduced to 90 ℃, adding 3% of polyether glycol glycidyl ether and 3% of methyl isobutyl ketone into a reaction kettle, and carrying out heat preservation reaction for 2 hours at the temperature of 90-95 ℃;

s3: cooling to 70 ℃, adding 0.2% of polyether siloxane, 2% of ethylene glycol hexyl ether, 2-7% of IPDI curing agent, HDI curing agent, 3-8% of lactic acid and 2-10% of water into the reaction kettle, and preserving heat for 1 h;

s4: cooling to 50 ℃, adding 1% of dinonylphenol polyoxyethylene ether, 0.1-3% of wetting agent and 10-40% of water, and stirring to react for 30 min;

s5: and adding rubber carbon black, kaolin, titanium dioxide and precipitated barium sulfate into the reaction kettle, stirring for 30min, and then sanding the product until the granularity is 10 mu m to finally obtain the electrophoretic paint colored paint.

Example 4

A preparation method of super wear-resistant electrophoretic paint colored paint resin comprises the following steps:

s1: adding 4% of amino-terminated liquid nitrile rubber, 3% of xylene and 3% of azobisisobutyronitrile into a reaction kettle, quickly heating to 80-90 ℃, and carrying out heat preservation reaction for 2 hours at 90 ℃;

s2: after the reaction of the step S1 is finished, adding 5% of polyether polyol glycidyl ether and 3% of methyl isobutyl ketone into a reaction kettle at the temperature of 90 ℃ to 95 ℃ for heat preservation reaction for 2 hours;

s3: cooling to 70 ℃, adding 0.7% of polyether siloxane, 3% of ethylene glycol hexyl ether, 5% of IPDI curing agent, 5% of HDI curing agent, 3-8% of lactic acid and 2-10% of water into the reaction kettle, and keeping the temperature for 1 h;

s4: cooling to 50 ℃, adding 2% of dinonylphenol polyoxyethylene ether, 1% of wetting agent and 10-40% of water, and stirring to react for 30 min;

s5: and adding rubber carbon black, modified nano-silica, kaolin, titanium dioxide and precipitated barium sulfate into the reaction kettle, stirring for 30min, sanding the product until the granularity is 10 mu m, and finally obtaining the electrophoretic paint colored paint.

Example 5:

a preparation method of super wear-resistant electrophoretic paint colored paint resin comprises the following steps:

s1: adding 6% of amino-terminated liquid nitrile rubber, 3% of methyl isobutyl ketone and 3% of azobisisobutyronitrile into a reaction kettle, quickly heating to 80-90 ℃, and carrying out heat preservation reaction for 2 hours at 90 ℃;

s2: after the reaction of the step S1 is finished, adding 5% of polyether polyol glycidyl ether and 3% of methyl isobutyl ketone into a reaction kettle at the temperature of 90 ℃ to 95 ℃ for heat preservation reaction for 2 hours;

s3: cooling to 70 ℃, adding 0.3% of polyether siloxane, 3% of ethylene glycol hexyl ether, 6% of IPDI curing agent, 6% of HDI curing agent, 3-8% of lactic acid and 2-10% of water into the reaction kettle, and preserving heat for 1 h;

s4: cooling to 50 ℃, adding 2% of dinonylphenol polyoxyethylene ether, 2% of wetting agent and 10-40% of water, and stirring to react for 30 min;

s5: and adding rubber carbon black, modified nano-silica, polytetrafluoroethylene wax powder, kaolin, titanium dioxide and precipitated barium sulfate into the reaction kettle, stirring for 30min, sanding the product until the granularity is 10 mu m, and finally obtaining the electrophoretic paint colored paint.

The electrodeposition paints prepared in examples 1 to 5 were measured for storage stability according to national standard method GB 6753.3-1986; the adhesion of the electrophoretic coating of the cathode is measured according to GB/T9286-1998 test for marking the paint film of the colored paint and the varnish; carrying out impact resistance measurement on the cathode electrophoretic coating according to GB/T1732-93 paint film impact resistance measurement method; the flexibility of the electrophoretic coating was measured according to GB/T6742-2007 bending test for paints and varnishes (cylindrical axes); the electrophoretic coating is subjected to an abrasion resistance test according to GB/T1768-2006 rotating rubber grinding wheel method for measuring abrasion resistance of colored paint and varnish, and the test results are shown in Table 1:

TABLE 1 test table for the performance of the electrodeposition paint coating prepared in examples 1 to 5

The performance tests of the electrophoretic paints prepared in examples 1 to 5 show that, as shown in table 1, the stability of each electrophoretic paint is good, the adhesion meets the use standards of the electrophoretic paint, and the prepared substances have good impact resistance.

Example 3 compared with examples 1-2, example 3 uses a composite curing agent, and after the composite curing agent is used, the mechanical stability of the electrophoretic paint formed in example 3 is improved, and the impact resistance and wear resistance are obviously improved, because the content of soft and hard segments in the electrophoretic paint resin can be adjusted by using the composite curing agent with a proper proportion, and because the reaction product urea bonds exist, the intermolecular hydrogen bonding force can be obviously enhanced, the cohesion of the electrophoretic paint is improved, and the hardness of the electrophoretic paint is improved.

Examples 4 and 5 compare the electrodeposition paints formed in examples 1 to 3, and modified nano SiO was added₂After being mixed with proper polytetrafluoroethylene wax powder and scratch-resistant auxiliary agent, the product has excellent construction performance, mechanical performance, weather resistance (the xenon lamp artificial aging resistance is more than or equal to 500h), salt fog resistance (the neutral salt fog resistance is more than or equal to 500h) and wear resistance(750g/500r<6％)。

The invention achieves the function of enhancing corrosion resistance and provides wear resistance by modifying the rubber resin; the amino-terminated liquid nitrile rubber has a good toughening effect, but the rubber can not be applied to resin and electrophoretic paint resin all the time, the invention carries out oxidative polymerization reaction by the interaction of the amino-terminated liquid nitrile rubber and an initiator, then the terminal amino group in the amino-terminated liquid nitrile rubber reacts with the epoxy group in the polyether polyol glycidyl ether to form modified rubber resin, and the modified rubber resin is prepared to form the electrophoretic paint resin, so that the flexibility and the wear resistance of the electrophoretic paint resin can be greatly improved, the impact resistance of the electrophoretic paint is improved, the proper amino-terminated synthetic rubber resin is selected for modification and then is acidified to form cationic resin, the proper doping proportion is tested, and the wear resistance of the resin is improved.