Water-based wear-resistant automobile coating and preparation method thereof

Abstract

The invention discloses a water-based wear-resistant automobile coating and a preparation method thereof, and belongs to the technical field of automobile coatings. By adding the modified silicone oil to modify the fluorine-containing acrylic resin, the toughness of the coating can be improved by the flexible chain segment of the organic silicon, so that the coating can better absorb energy and reduce the formation and expansion of cracks under the action of external force, thereby improving the wear resistance; the organic silicon modified fluorine-containing acrylate emulsion can form a compact protective layer on the surface of the coating, the protective layer can reduce the interface friction coefficient, the wear-resistant filler is added and uniformly dispersed on the surface of the organic silicon modified fluorine-containing acrylate, and wear caused by friction is reduced; meanwhile, the epoxy resin is subjected to toughening modification, and the impact resistance of the coating can be improved while the hardness of the coating is improved through the synergistic effect of the two components, so that the coating is unlikely to be damaged when being impacted by external force, and the wear resistance is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile coatings, and in particular relates to a water-based wear-resistant automobile coating and a preparation method thereof. Background Art

[0002] The axle of a car is a vital component of the vehicle. It is closely connected to the frame or load-bearing body through the suspension system. It not only carries the entire weight of the car, but also plays an indispensable role in ensuring that the car can travel smoothly under various road conditions. In order to ensure that it can be in good working condition for a long time and avoid premature corrosion and damage, the surface of the axle needs to be carefully treated with protective coating. In China, the coating process of axles is mainly divided into two categories: water-based single-component coatings and water-based two-component epoxy coatings. The water-based single-component coating system has occupied a wide share in the ordinary commercial vehicle axle and light truck axle market due to its simple construction and low cost. This coating system does not require a complicated curing process, saving time and cost, and is therefore favored by many manufacturers. However, for high-end markets such as heavy truck axles and export axles, in order to ensure that the protective performance of the coating meets the highest standards, the host manufacturers usually choose to use water-based two-component epoxy coatings with more excellent performance. Although water-based two-component epoxy coatings have excellent performance in corrosion protection and salt spray resistance, their hardness is generally not as good as traditional solvent-based epoxy coatings. This means that during use, the coating is more susceptible to scratches and wear due to friction. In addition, during the drying process of water-based epoxy coatings, the volatilization of water and volatile organic compounds (VOCs) may cause voids or defects in the coating, affecting the overall structural density of the coating. Since the intermolecular forces are relatively weak, these defects are more easily exposed during friction, leading to further wear of the coating. Therefore, in order to improve the protective performance and service life of axle coatings, the industry urgently needs to optimize and improve existing coating technologies, improve the safety performance of vehicles, reduce maintenance costs, and meet the requirements of sustainable development. Summary of the invention

[0003] The object of the present invention is to provide a water-based wear-resistant automobile coating and a preparation method thereof, which are used to improve the wear resistance of the coating for axle coating.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a water-based wear-resistant automobile coating comprises the following steps:

[0006] S1, take perfluorohexyl ethyl methacrylate (purchased from Jinan Guochen Taifu Chemical Co., Ltd.), octadecyl acrylate (purchased from Guangzhou Shanghe Chemical Technology Co., Ltd.), methyl methacrylate (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.), methacrylic acid (purchased from Jinan Century Tongda Chemical Co., Ltd.), isooctyl acrylate (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.), modified silicone oil, N-hydroxyacrylamide (purchased from Shanghai Jiubang Chemical Co., Ltd.), emulsifier 1831 (purchased from Guangzhou Leshi Biotechnology Co., Ltd.), penetrant AEO-20 (purchased from Tianjin Zhongtian Chemical Industry and Trade Co., Ltd. Company), tripropylene glycol (purchased from Wuhan Yuqing Jiaheng Pharmaceutical Co., Ltd.), and deionized water were mixed and ultrasonically dispersed for 20-30 minutes, vinyl chloride and azobisisobutylamidine hydrochloride (purchased from Wuhan Rongcan Biotechnology Co., Ltd.) were added in a nitrogen atmosphere, and then stirred at 55-65° C. for 5-7 hours, and dodecanol ester (purchased from Hubei Nona Technology Co., Ltd.), wear-resistant filler, defoamer BYK-093 (purchased from Qiyuan (Guangdong) Pharmaceutical Chemical Co., Ltd.), D-6600 water-based anti-flash rust agent (purchased from Wuhan Xinyang Ruihe Chemical Technology Co., Ltd.) were added, and ultrasonic dispersion was performed for 30-40 minutes to obtain material A;

[0007] S2, take polyethylene glycol monomethyl ether with a relative molecular mass of 650 (purchased from Tianjin Xiensi Biochemical Technology Co., Ltd.) and toluene diisocyanate (purchased from Guangzhou North Chemical Co., Ltd.) and mix them, stir at 40-50 ° C for 2-3 hours, heat to 70-75 ° C and stir for 1-2 hours to obtain material B;

[0008] S3, taking the material B and epoxy resin E-51 (purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd.), mixing, stirring at 75-80° C. for 3-4 hours, to obtain material C;

[0009] S4, take the material C, thickener RM-8W (purchased from Guangzhou Yachuang Trading Co., Ltd.) and deionized water were mixed and stirred for 20-30 minutes to obtain material D;

[0010] S5. Mix the material A and the material D, and stir for 10-20 minutes to obtain the water-based wear-resistant automotive coating.

[0011] As a preferred technical solution of the present invention, in step S1, the mass ratio of perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, deionized water, vinyl chloride, azobisisobutylamidine hydrochloride, dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor is 18-24:10-12:10-12:20-25:28-36:20-30:6-8:2-3:1-3:1-2:30-40:20-30:2-3:4-6:6-8:1-2:2-3.

[0012] As a preferred technical solution of the present invention, in step S2, the molar ratio of the polyethylene glycol monomethyl ether to toluene diisocyanate is 0.8-1:1-1.2.

[0013] As a preferred technical solution of the present invention, in step S3, the mass ratio of the material B to the epoxy resin E-51 is 1-3:8-10.

[0014] As a preferred technical solution of the present invention, the epoxy value of the epoxy resin E-51 is 0.51 mol / 100g.

[0015] As a preferred technical solution of the present invention, in step S4, the material C and the thickener The mass ratio of RM-8W and deionized water is 50-60:0.4-0.6:60-80.

[0016] As a preferred technical solution of the present invention, in step S5, the mass ratio of material A to material D is 10:1.2-1.6.

[0017] As a preferred technical solution of the present invention, the preparation of the modified silicone oil comprises the following steps:

[0018] Take octamethylcyclotetrasiloxane (purchased from Zhejiang Hengyecheng Silicone Co., Ltd.), octadecylmethyldimethoxysilane (purchased from Beijing Huawei Ruike Chemical Technology Co., Ltd.), γ-mercaptopropylmethyldimethoxysilane (purchased from Xiaogan Shenyuan Chemical Co., Ltd.), 3-dimethylaminopropyl (dimethoxy)methylsilane (purchased from Shanghai Tangui New Material Technology Co., Ltd.) and mix, stir for 20-30 minutes, heat to 90-100 ° C, add tetramethylammonium hydroxide (purchased from Wuhan Adama New Energy Co., Ltd.), stir for 0.5-1h, then stir for 3-4h under -0.098MPa vacuum conditions, cool, and obtain the modified silicone oil.

[0019] As a preferred technical solution of the present invention, the mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane and tetramethylammonium hydroxide is 40-60:2-4:1-2:2-4:0.2-0.4.

[0020] As a preferred technical solution of the present invention, the preparation of the wear-resistant filler comprises the following steps:

[0021] Agar (purchased from Tianjin Xiensi Biochemical Technology Co., Ltd.) and propylene glycol (purchased from Jinan Jinhong Chemical Co., Ltd.) were mixed, stirred at 70-80°C for 4-6 hours, and then cordierite powder (purchased from Fusman Technology (Beijing) Co., Ltd.) was added, the pH was adjusted to 7.7-8.2, sodium silicate (purchased from Jiangxi Yigao Chemical Industry Development Co., Ltd.) was added, ultrasonic stirring was performed for 20-30 minutes, and the mixture was allowed to stand for 12-18 hours to obtain the wear-resistant filler.

[0022] As a preferred technical solution of the present invention, the mass ratio of agar, glycerol, cordierite powder and sodium silicate is 1.3-1.6:100:1-1.5:0.2-0.3.

[0023] The water-based wear-resistant automobile coating is prepared by the above-mentioned preparation method.

[0024] Beneficial effects of the present invention:

[0025] The invention discloses a water-based wear-resistant automobile coating and a preparation method thereof. The fluorine-containing acrylic resin is modified by adding modified silicone oil. The flexible chain segment of the silicone can improve the toughness of the coating, so that the coating can better absorb energy when subjected to external force, reduce the formation and expansion of cracks, and thus improve the wear resistance. The silicone-modified fluorine-containing acrylic emulsion can form a dense protective layer on the surface of the coating, which can reduce the interface friction coefficient. Wear-resistant fillers are added and evenly dispersed on the surface of the silicone-modified fluorine-containing acrylic to reduce the wear caused by friction. At the same time, the epoxy resin is toughened and modified, and the hardness of the coating is improved through the synergistic effect between the two components, and the impact resistance can also be improved, which helps the coating not to be easily damaged when subjected to external force impact, thereby improving the wear resistance. DETAILED DESCRIPTION

[0026] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0027] Example 1

[0028] A method for preparing a water-based wear-resistant automobile coating comprises the following steps:

[0029] S1. Mix perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, and deionized water, and ultrasonically disperse for 20 minutes. Add vinyl chloride and azobisisobutylamidine hydrochloride in a nitrogen atmosphere, and then stir at 55°C for 5 hours. Add dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor, and ultrasonically disperse for 30 minutes to obtain the product. Material A: the mass ratio of perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, deionized water, vinyl chloride, azobisisobutylamidine hydrochloride, dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor is 18:10:10:20:28:20:6:2:1:1:30:20:2:4:6:1:2;

[0030] S2, taking polyethylene glycol monomethyl ether and toluene diisocyanate, mixing, stirring at 40°C for 2h, heating to 70°C and stirring for 1h, to obtain material B; the molar ratio of polyethylene glycol monomethyl ether and toluene diisocyanate is 0.8:1;

[0031] S3, taking the material B and epoxy resin E-51, mixing them, stirring at 75° C. for 3 hours, to obtain material C; the mass ratio of the material B to the epoxy resin E-51 is 1:8;

[0032] S4, take the material C, thickener RM-8W and deionized water were mixed and stirred for 20 minutes to obtain material D; the material C and thickener The mass ratio of RM-8W and deionized water is 50:0.4:60;

[0033] S5. Mix the material A and the material D and stir for 10 minutes to obtain the water-based wear-resistant automotive coating; the mass ratio of the material A to the material D is 10:1.2;

[0034] The preparation of the modified silicone oil comprises the following steps:

[0035] Octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane and 3-dimethylaminopropyl(dimethoxy)methylsilane were mixed and stirred for 20 min, the mixture was heated to 90° C., tetramethylammonium hydroxide was added and stirred for 0.5 h, and then stirred for 3 h under a vacuum condition of -0.098 MPa, and cooled to obtain the modified silicone oil;

[0036] The mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane, and tetramethylammonium hydroxide is 40:2:1:2:0.2;

[0037] The preparation of the wear-resistant filler comprises the following steps:

[0038] Agar and glycerol are mixed, stirred at 70° C. for 4 hours, cordierite powder is added, the pH is adjusted to 7.7, sodium silicate is added, ultrasonic stirring is performed for 20 minutes, and the mixture is allowed to stand for 12 hours to obtain the wear-resistant filler; the mass ratio of the agar, glycerol, cordierite powder and sodium silicate is 1.3:100:1:0.2.

[0039] Example 2

[0040] A method for preparing a water-based wear-resistant automobile coating comprises the following steps:

[0041] S1, taking perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, and deionized water, mixing, ultrasonically dispersing for 25 minutes, adding vinyl chloride and azobisisobutylamidine hydrochloride in a nitrogen atmosphere, and then stirring at 60° C. for 6 hours, adding dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor, and ultrasonically dispersing for 35 minutes to obtain material A; The mass ratio of perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, deionized water, vinyl chloride, azobisisobutylamidine hydrochloride, dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor is 21:11:11:23:32:25:7:2.5:2:1.5:35:25:2.5:5:7:1.5:2.5;

[0042] S2, taking polyethylene glycol monomethyl ether and toluene diisocyanate, mixing, stirring at 45°C for 2.5h, heating to 72°C and stirring for 1.5h, to obtain material B; the molar ratio of polyethylene glycol monomethyl ether and toluene diisocyanate is 0.9:1.1;

[0043] S3, taking the material B and epoxy resin E-51, mixing them, stirring at 77° C. for 3.5 hours, to obtain material C; the mass ratio of the material B to the epoxy resin E-51 is 2:9;

[0044] S4, take the material C, thickener RM-8W and deionized water were mixed and stirred for 25 minutes to obtain material D; the material C and thickener The mass ratio of RM-8W and deionized water is 55:0.5:70;

[0045] S5. Mix the material A and the material D and stir for 15 minutes to obtain the water-based wear-resistant automotive coating; the mass ratio of the material A to the material D is 10:1.4;

[0046] The preparation of the modified silicone oil comprises the following steps:

[0047] Octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane and 3-dimethylaminopropyl(dimethoxy)methylsilane were mixed, stirred for 25 min, heated to 95° C., tetramethylammonium hydroxide was added, stirred for 0.8 h, then stirred for 3.5 h under a vacuum condition of -0.098 MPa, and cooled to obtain the modified silicone oil;

[0048] The mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane, and tetramethylammonium hydroxide is 50:3:1.5:3:0.3;

[0049] The preparation of the wear-resistant filler comprises the following steps:

[0050] Agar and glycerol are mixed, stirred at 75° C. for 5 hours, cordierite powder is added, the pH is adjusted to 7.9, sodium silicate is added, ultrasonic stirring is performed for 25 minutes, and the mixture is allowed to stand for 15 hours to obtain the wear-resistant filler; the mass ratio of the agar, glycerol, cordierite powder and sodium silicate is 1.45:100:1.25:0.28.

[0051] Example 3

[0052] A method for preparing a water-based wear-resistant automobile coating comprises the following steps:

[0053] S1. Mix perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, and deionized water, and ultrasonically disperse for 30 minutes. Add vinyl chloride and azobisisobutylamidine hydrochloride in a nitrogen atmosphere, and then stir at 65°C for 7 hours. Add dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor, and ultrasonically disperse for 40 minutes to obtain the product. Material A: the mass ratio of perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, deionized water, vinyl chloride, azobisisobutylamidine hydrochloride, dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor is 24:12:12:25:36:30:8:3:3:2:40:30:3:6:8:2:3;

[0054] S2, taking polyethylene glycol monomethyl ether and toluene diisocyanate, mixing, stirring at 50°C for 3h, heating to 75°C and stirring for 2h, to obtain material B; the molar ratio of polyethylene glycol monomethyl ether and toluene diisocyanate is 1:1.2;

[0055] S3, taking the material B and epoxy resin E-51, mixing them, stirring at 80° C. for 4 hours, to obtain material C; the mass ratio of the material B to the epoxy resin E-51 is 3:10;

[0056] S4, take the material C, thickener RM-8W and deionized water were mixed and stirred for 30 minutes to obtain material D; the material C and thickener The mass ratio of RM-8W and deionized water is 60:0.6:80;

[0057] S5, mixing the material A and the material D, stirring for 20 minutes, to obtain the water-based wear-resistant automotive coating; the mass ratio of the material A to the material D is 10:1.6;

[0058] The preparation of the modified silicone oil comprises the following steps:

[0059] Octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane and 3-dimethylaminopropyl(dimethoxy)methylsilane were mixed, stirred for 30 min, heated to 100° C., tetramethylammonium hydroxide was added, stirred for 1 h, then stirred for 4 h under a vacuum condition of -0.098 MPa, and cooled to obtain the modified silicone oil;

[0060] The mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane, and tetramethylammonium hydroxide is 60:4:2:4:0.4;

[0061] The preparation of the wear-resistant filler comprises the following steps:

[0062] Agar and glycerol are mixed, stirred at 80° C. for 6 hours, cordierite powder is added, the pH is adjusted to 8.2, sodium silicate is added, ultrasonic stirring is performed for 30 minutes, and the mixture is allowed to stand for 18 hours to obtain the wear-resistant filler; the mass ratio of the agar, glycerol, cordierite powder and sodium silicate is 1.6:100:1.5:0.3.

[0063] Comparative Example 1

[0064] The difference from Example 2 is that no modified silicone oil is added in step S1.

[0065] Comparative Example 2

[0066] The difference from Example 2 is that in step S1, the modified silicone oil is replaced by octamethylcyclotetrasiloxane.

[0067] Comparative Example 3

[0068] The difference from Example 2 is that in the preparation process of the modified silicone oil, the mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane, and tetramethylammonium hydroxide is 50:0:4.5:3:0.3.

[0069] Comparative Example 4

[0070] The difference from Example 2 is that in the preparation process of the modified silicone oil, the mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane, and tetramethylammonium hydroxide is 50:3:0:4.5:0.3.

[0071] Comparative Example 5

[0072] The difference from Example 2 is that in the preparation process of the modified silicone oil, the mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane, and tetramethylammonium hydroxide is 50:3:4.5:0:0.3.

[0073] Comparative Example 6

[0074] The difference from Example 2 is that no wear-resistant filler is added in step S1.

[0075] Comparative Example 7

[0076] The difference from Example 2 is that after adding cordierite powder during the preparation of the wear-resistant filler, the pH is adjusted to 6.5.

[0077] Comparative Example 8

[0078] The difference from Example 2 is that after adding cordierite powder during the preparation of the wear-resistant filler, the pH is adjusted to 7.0.

[0079] Comparative Example 9

[0080] The difference from Example 2 is that after adding cordierite powder during the preparation of the wear-resistant filler, the pH is adjusted to 7.6.

[0081] Comparative Example 10

[0082] The difference from Example 2 is that after adding cordierite powder during the preparation of the wear-resistant filler, the pH is adjusted to 8.3.

[0083] Comparative Example 11

[0084] The difference from Example 2 is that after adding cordierite powder during the preparation of the wear-resistant filler, the pH is adjusted to 9.

[0085] Comparative Example 12

[0086] The difference from Example 2 is that perfluorohexylethyl methacrylate is not added in step S1.

[0087] Comparative Example 13

[0088] A method for preparing a water-based wear-resistant automobile coating comprises the following steps:

[0089] S1. Take perfluorohexyl ethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, and deionized water, mix them, and ultrasonically disperse them for 20-30 minutes. Add vinyl chloride and azobisisobutylamidine hydrochloride in a nitrogen atmosphere, and then stir at 55-65° C. for 5-7 hours. Add dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor, and ultrasonically disperse them for 30-40 minutes to obtain material A. The perfluorohexyl ethyl methacrylate The mass ratio of ester, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, deionized water, vinyl chloride, azobisisobutylamidine hydrochloride, dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust preventer is 18-24:10-12:10-12:20-25:28-36:20-30:6-8:2-3:1-3:1-2:30-40:20-30:2-3:4-6:6-8:1-2:2-3;

[0090] S2, take epoxy resin E-51, thickener RM-8W and deionized water were mixed and stirred for 20-30 minutes to obtain material d; the epoxy resin E-51 and thickener The mass ratio of RM-8W and deionized water is 50-60:0.4-0.6:60-80;

[0091] S5. Mix the material A and the material d, and stir for 10-20 minutes to obtain a water-based wear-resistant automotive coating; the mass ratio of the material A to the material d is 10:1.2-1.6.

[0092] Performance Testing

[0093] Preparation of coating: The coating prepared in the above-mentioned embodiment and comparative example was evenly scraped on the surface of the polished tinplate sheet and left at room temperature for 24 hours to obtain the corresponding coating.

[0094] Conduct pencil hardness test according to standard GB / T 6739-2006;

[0095] Impact resistance test is carried out according to standard GB / T 1732-2020;

[0096] Wear resistance test is carried out according to standard GB / T 1768-2006;

[0097] The test results are shown in Table 1 below;

[0098] Table 1

[0099]

[0100]

[0101] As can be seen from Table 1, the automotive coatings prepared in Examples 1-3 have excellent wear resistance, high hardness and impact resistance after being cured into films; the present application modifies the fluorinated acrylic resin by adding modified silicone oil, and the flexible chain segments of the silicone can improve the toughness of the coating, so that the coating can better absorb energy when subjected to external forces, reduce the formation and expansion of cracks, and thus improve the wear resistance; the silicone-modified fluorinated acrylic emulsion can form a dense protective layer on the surface of the coating, which can reduce the interfacial friction coefficient, and add wear-resistant fillers, which are evenly dispersed on the surface of the silicone-modified fluorinated acrylic to reduce the wear caused by friction; at the same time, by toughening and modifying the epoxy resin, the hardness of the coating is improved through the synergistic effect between the two components, and its impact resistance can also be improved, which helps the coating not to be easily damaged when subjected to external force impact, thereby improving the wear resistance.

[0102] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a water-based wear-resistant automotive coating, characterized in that: The following steps are involved: S1. Mix perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol and deionized water, disperse by ultrasonic, add vinyl chloride and azobisisobutylamidine hydrochloride in a nitrogen atmosphere, stir at 55-65° C., add dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093 and D-6600 water-based flash rust inhibitor, disperse by ultrasonic, and obtain material A. S2, take polyethylene glycol monomethyl ether and toluene diisocyanate, mix, stir at 40-50°C, heat to 70-75°C, and stir to obtain material B; S3, taking the material B and epoxy resin E-51, mixing them, stirring at 75-80° C. to obtain material C; S4, taking the material C, thickener Acrysol® RM-8W, and deionized water, mixing and stirring to obtain material D; S5, mixing the material A and the material D, and stirring to obtain the water-based wear-resistant automobile coating.

2. The method for preparing a water-based wear-resistant automobile coating according to claim 1, characterized in that: In step S1, the mass ratio of perfluorohexylethyl methacrylate, octadecyl acrylate, methyl methacrylate, methacrylic acid, isooctyl acrylate, modified silicone oil, N-hydroxyacrylamide, emulsifier 1831, penetrant AEO-20, tripropylene glycol, deionized water, vinyl chloride, azobisisobutylamidine hydrochloride, dodecyl alcohol ester, wear-resistant filler, defoamer BYK-093, and D-6600 water-based flash rust inhibitor is 18-24:10-12:10-12:20-25:28-36:20-30:6-8:2-3:1-3:1-2:30-40:20-30:2-3:4-6:6-8:1-2:2-3.

3. The method for preparing a water-based wear-resistant automobile coating according to claim 1, characterized in that: In step S2, the molar ratio of the polyethylene glycol monomethyl ether to toluene diisocyanate is 0.8-1:1-1.

2.

4. The method for preparing a water-based wear-resistant automobile coating according to claim 1, characterized in that: In step S3, the mass ratio of the material B to the epoxy resin E-51 is 1-3:8-10.

5. The method for preparing a water-based wear-resistant automobile coating according to claim 1, characterized in that: In step S4, the mass ratio of material C, thickener Acrysol® RM-8W, and deionized water is 50-60:0.4-0.6:60-80.

6. The method for preparing a water-based wear-resistant automobile coating according to claim 1, characterized in that: In step S5, the mass ratio of material A to material D is 10:1.2-1.

6.

7. The method for preparing a water-based wear-resistant automobile coating according to claim 1, characterized in that: The preparation of the modified silicone oil comprises the following steps: Octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane and 3-dimethylaminopropyl(dimethoxy)methylsilane are mixed, stirred, heated to 90-100° C., tetramethylammonium hydroxide is added, stirred, then vacuum stirred and cooled to obtain the modified silicone oil.

8. The method for preparing a water-based wear-resistant automobile coating according to claim 7, characterized in that: The mass ratio of octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, 3-dimethylaminopropyl (dimethoxy)methylsilane and tetramethylammonium hydroxide is 40-60: 2-4: 1-2: 2-4: 0.2-0.

4.

9. The method for preparing a water-based wear-resistant automobile coating according to claim 1, characterized in that: The preparation of the wear-resistant filler comprises the following steps: Agar and glycerol are mixed, stirred at 70-80° C., cordierite powder is added, the pH is adjusted to 7.7-8.2, sodium silicate is added, ultrasonic stirring is performed, and the mixture is allowed to stand for 12-18 hours to obtain the wear-resistant filler; The mass ratio of agar, glycerol, cordierite powder and sodium silicate is 1.3-1.6:100:1-1.5:0.2-0.

3.

10. A water-based wear-resistant automobile coating prepared by the preparation method according to any one of claims 1 to 9.

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