A high-temperature resistant modified powder coating for power batteries and its manufacturing process

Abstract

This invention relates to the field of powder coatings and discloses a high-temperature resistant modified powder coating for power batteries and its manufacturing process. The powder coating comprises: organosilicon-modified multifunctional epoxy resin, glass powder, modified α-zirconium phosphate, silica powder, and additives. The organosilicon-modified multifunctional epoxy resin is prepared by reacting a tri-terminated vinyl silicone resin, which is obtained by reacting phenyltris(dimethylsiloxane)silane and terminal vinyl silicone oil, with the organosilicon-modified epoxy resin. The organosilicon-modified epoxy resin is prepared by reacting 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide with epichlorohydrin and acryloyl chloride, respectively, and then reacting the resulting double-bonded DOPO-based epoxy compound with phenyltris(dimethylsiloxane)silane. The modified α-zirconium phosphate is prepared by modifying polyaniline with 2-hydroxyphosphonoacetic acid doped with it. The powder coating prepared by this invention has good insulation and voltage resistance, high and low temperature resistance, corrosion resistance, and flame retardancy.

Description

Technical Field

[0001] This invention belongs to the field of powder coating technology, specifically relating to a high-temperature resistant modified powder coating for power batteries and its manufacturing process. Background Technology

[0002] Powder coatings are characterized by energy saving, environmental protection, zero VOC emissions, good decorative properties, and safe use. In recent years, domestic powder coating technology has developed rapidly. With the improvement of people's living standards, and in the ever-changing automotive industry, new energy vehicles are rapidly developing across the country due to their low noise, high driving stability, and zero-emission green environmental protection features. As green transportation vehicles, new energy vehicles have increasingly longer driving ranges, more series-connected battery packs, and smaller spacing between adjacent batteries. Furthermore, the battery packs are prone to heat generation and high temperatures during operation. Therefore, the quality of the insulating materials between the power batteries is a key factor determining the proper operation of the vehicle's power battery.

[0003] Currently, a large number of power battery packs are coated with epoxy insulating powder coatings, including cells, top covers, and side panels. However, in the preparation of epoxy resin powder coatings, there are often many defects and pores inside the resin matrix. After prolonged contact with corrosive media, water molecules can carry the corrosive media and penetrate into these defects and pores, reducing the protective performance of the epoxy coating, accelerating the corrosion of the substrate, and causing damage to the equipment. In addition, power batteries are an extremely important component of new energy vehicles and one of the core components related to safety. After aging, power batteries are prone to abnormal phenomena such as spontaneous combustion. Moreover, epoxy powder coatings have low heat resistance (below 150℃), which is far below the flame temperature when combustion occurs. Therefore, the coatings for power batteries in new energy vehicles need to have special functions such as fire resistance and temperature resistance. Summary of the Invention

[0004] To address the shortcomings mentioned in the background art, the present invention aims to provide a high-temperature resistant modified powder coating for power batteries and its manufacturing process. The prepared modified powder coating has good adhesion, high hardness, good insulation and voltage resistance, and resistance to high and low temperatures, while also possessing good corrosion resistance and flame retardant properties.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A high-temperature resistant modified powder coating for power batteries comprises the following components in parts by weight: 40-70 parts of organosilicon-modified multifunctional epoxy resin, 5-15 parts of curing agent, 0.5-1 part of leveling agent, 5-15 parts of inorganic pigment, 5-15 parts of glass powder, 2-5 parts of matting agent, 2-5 parts of modified α-zirconium phosphate, and 10-25 parts of silica powder.

[0007] The organosilicon-modified multifunctional epoxy resin is prepared by hydrosilylation reaction between the remaining ungrafted silane-hydrogen bond in the organosilicon-modified epoxy resin and the tri-terminal vinyl silicone resin.

[0008] The organosilicon-modified epoxy resin is prepared by using the two hydroxyl groups at both ends of 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide to undergo substitution reactions with epichlorohydrin and acryloyl chloride, respectively, and then the two molecules of the double-bonded DOPO-based epoxy compound prepared are subjected to a hydrosilylation reaction with phenyltris(dimethylsiloxane)silane.

[0009] The tri-terminated vinyl silicone resin is prepared by hydrosilylation reaction of phenyltris(dimethylsiloxane)silane and terminal vinyl silicone oil; the modified α-zirconium phosphate is prepared by modification of polyaniline doped with 2-hydroxyphosphonoacetic acid.

[0010] Preferably, the glass powder is a low melting point glass powder with a melting point of 400-500℃.

[0011] Preferably, the curing agent is one of phenolic curing agents, amine curing agents, and acid anhydride curing agents; the leveling agent is a polyacrylate leveling agent; and the matting agent is a mixture of silica, talc, and aluminum stearate, wherein the mass ratio of silica, talc, and aluminum stearate is 1:1:1.

[0012] Preferably, the preparation method of the organosilicon-modified multifunctional epoxy resin includes the following steps:

[0013] (1) Take 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide, epichlorohydrin and propylene glycol methyl ether in a reactor, heat to 60-70℃ and reduce the pressure to 160 mmHg absolute pressure, then add 50% sodium hydroxide aqueous solution within 0.5-1h. After the addition is completed, continue the reaction at a constant temperature for 30-40min. After the reaction is completed, wash and distill to prepare DOPO-based epoxy compound;

[0014] (2) Take DOPO-based epoxy compound, triethylamine and tetrahydrofuran in a reactor, add a mixed solution of acryloyl chloride and tetrahydrofuran at -10 to -5℃, stir the reaction for 3 to 4 hours, and then continue the reaction at room temperature for 10 to 12 hours. After the reaction is completed, filter, rotary evaporate and dry to prepare double bonded DOPO-based epoxy compound.

[0015] (3) Take phenyltris(dimethylsiloxane)silane in a reactor, heat it to 100-110℃, keep it at the temperature for 20-30 min, then cool it to 95-105℃, and then add a mixed solution of chloroplatinic acid catalyst, double bonded DOPO epoxy compound and tetrahydrofuran, and react it at 100-110℃ for 1-1.5 h. After the reaction is completed, remove the solvent by rotary evaporation to prepare organosilicon modified epoxy resin;

[0016] (4) Take phenyltris(dimethylsiloxane)silane and vinyl-terminated silicone oil in a reactor, heat to 95-100℃, keep warm for 20-30 min, then cool down to 85-90℃, then add chloroplatinic acid catalyst, and react at a constant temperature for 1-1.5 h to prepare trivinyl-terminated silicone resin.

[0017] (5) Take tri-terminal vinyl silicone resin in a reactor, heat it to 90-95℃, keep it at that temperature for 20-30 minutes, then add chloroplatinic acid catalyst and organosilicon modified epoxy resin, and react at a constant temperature for 3-4 hours to prepare organosilicon modified multifunctional epoxy resin.

[0018] Preferably, in step (1), the molar ratio of 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide and epichlorohydrin is 1:1 to 1.3.

[0019] Preferably, in step (2), the molar ratio of DOPO-based epoxy compound to acryloyl chloride is 1:1 to 1.2.

[0020] Preferably, in step (3), the molar ratio of phenyltris(dimethylsiloxane)silane to double-bonded DOPO-based epoxy compound is 1:2 to 2.1.

[0021] Preferably, the method for preparing the modified α-zirconium phosphate includes the following steps:

[0022] A. Take zirconium oxychloride octahydrate and phosphoric acid in a reactor, stir thoroughly, then add hydrofluoric acid and stir continuously to obtain a white solution. Then reflux at 95-105℃ for 20-24h. After the reaction is completed, cool and let stand to precipitate. After filtration, wash thoroughly with deionized water until pH is 5, and finally dry to prepare α-zirconium phosphate.

[0023] B. Take a 2-hydroxyphosphonoacetic acid solution in a reactor, add α-zirconium phosphate while stirring continuously, then add aniline monomer, stir and disperse evenly to obtain a dispersion. Take ammonium persulfate dissolved in 2-hydroxyphosphonoacetic acid solution and add it to the dispersion. After mixing evenly, place it in an ice-water bath and react for 20-24 hours. After the reaction is completed, filter under reduced pressure to separate the product, wash repeatedly with anhydrous ethanol and deionized water, and finally dry to prepare modified α-zirconium phosphate.

[0024] Preferably, the concentration of the 2-hydroxyphosphonoacetic acid solution in step B is 0.9–1.3 mol / L, and the addition ratio of the 2-hydroxyphosphonoacetic acid solution, α-zirconium phosphate, and aniline monomer in the dispersion is 200–250 mL: 1–1.5 g: 4.5–5 g.

[0025] A manufacturing process for a high-temperature resistant modified powder coating for power batteries includes the following steps: weighing each component by weight, mixing organosilicon modified epoxy resin, curing agent, leveling agent, inorganic pigment, glass powder, matting agent, modified α-zirconium phosphate and silica powder, then melting and extruding the mixture through a twin-screw extruder, followed by cooling and pulverizing to prepare the high-temperature resistant modified powder coating for power batteries.

[0026] The beneficial effects of this invention are:

[0027] This invention utilizes a substitution reaction between a terminal hydroxyl group in 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide and epichlorohydrin to prepare a DOPO-based epoxy compound. Then, a substitution reaction is performed between the other terminal hydroxyl group in the DOPO-based epoxy compound and acryloyl chloride to prepare a double-bonded DOPO-based epoxy compound with an epoxy group at one end and a double bond functional group at the other. Subsequently, a hydrosilylation reaction is carried out between phenyltris(dimethylsiloxane)silane and two molecules of the double-bonded DOPO-based epoxy compound to prepare an organosilicon-modified epoxy compound. This invention relates to a silicone-modified epoxy resin. Specifically, it utilizes a hydrosilylation reaction between phenyltris(dimethylsiloxane)silane and terminal vinyl silicone oil to prepare a tri-terminated vinyl silicone resin. Furthermore, the remaining ungrafted silane-hydrogen bond in the silicone-modified epoxy resin is subjected to a hydrosilylation reaction with the tri-terminated vinyl silicone resin to prepare a silicone-modified multifunctional epoxy resin containing six epoxy functions. This provides excellent mechanical properties, better absorbs fracture energy, and improves high and low temperature resistance. Additionally, the DOPO group introduced into the silicone-modified multifunctional epoxy resin exhibits excellent flame retardant and fire-retardant properties.

[0028] This invention utilizes 2-hydroxyphosphonoacetic acid-doped polyaniline to modify α-zirconium phosphate, wherein the 2-hydroxyphosphonoacetic acid is attached to the polyaniline by electrostatic force, and the PO4 on the 2-hydroxyphosphonoacetic acid... 3- It adheres to the surface of α-zirconium phosphate through Lewis acid-base chemisorption, and the surface of α-zirconium phosphate can provide active sites for aniline monomers, thereby promoting the growth of polyaniline on the surface of α-zirconium phosphate. In addition, the carboxyl groups in 2-hydroxyphosphonoacetic acid can react with the epoxy groups in organosilicon-modified multifunctional epoxy resin, thereby improving the dispersibility of α-zirconium phosphate in the resin, thus increasing the density of the coating and improving the mechanical properties and corrosion resistance of the powder coating. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: A method for preparing an organosilicon-modified multifunctional epoxy resin includes the following steps:

[0031] (1) Take 6.4g of 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide, 2.1g of epichlorohydrin and 60mL of propylene glycol methyl ether in a reactor, heat to 65℃ and reduce the pressure to 160mmHg absolute pressure, then add 0.4g of 50% sodium hydroxide aqueous solution within 1h. After the addition is completed, continue the reaction for 30min. After the reaction is completed, wash and distill to prepare DOPO-based epoxy compound;

[0032] (2) Take 7.6g of DOPO-based epoxy compound (Mr = 380.3), 2.2g of triethylamine and 100mL of tetrahydrofuran into a reactor, place it at -5℃ and add a mixed solution of 1.9g of acryloyl chloride and 20mL of tetrahydrofuran, stir and react for 4h, and then continue to react at room temperature for 12h. After the reaction is completed, filter, rotary evaporate and dry to prepare double-bonded DOPO-based epoxy compound;

[0033] (3) Take 3.3g of phenyltris(dimethylsiloxane)silane in a reactor, heat it to 110℃, keep it at that temperature for 30min, then cool it down to 105℃, and then add 7.8uL of chloroplatinic acid catalyst PT-5000, 8.7g of double-bonded DOPO-based epoxy compound (Mr=434.3) and 20mL of tetrahydrofuran mixed solution, and place it at 110℃ for 1h. After the reaction is completed, remove the solvent by rotary evaporation to prepare organosilicon modified epoxy resin;

[0034] (4) Take 2.8g of phenyltris(dimethylsiloxane)silane and 50.1g of vinyl-terminated silicone oil RH-Vi392 (vinyl 3.23%, produced by Zhejiang Runhe New Material Technology Co., Ltd.) in a reactor, heat to 100℃, keep warm for 30min, then cool down to 90℃, and then add 27.3uL of chloroplatinic acid catalyst PT-5000. React at constant temperature for 1h to prepare trivinyl-terminated silicone resin. The vinyl content of the product was measured to be 0.068mol / 100g.

[0035] (5) Take 22g of tri-terminal vinyl silicone resin into a reactor, heat it to 90℃, keep it at that temperature for 30min, then add 18.7uL of chloroplatinic acid catalyst PT-5000 and 18g of organosilicon modified epoxy resin (Mr=1199.3), and react at a constant temperature for 4h to prepare organosilicon modified multifunctional epoxy resin.

[0036] Example 2: A method for preparing modified α-zirconium phosphate includes the following steps:

[0037] A. Take 9.7g of zirconium oxychloride octahydrate and 100mL of 3mol / L phosphoric acid in a reactor, stir thoroughly, then add 6mL of hydrofluoric acid and stir continuously to obtain a white solution. Then, reflux at 100℃ for 24h. After the reaction is completed, cool and let stand to precipitate, filter and wash thoroughly with deionized water until pH is 5, and finally dry to prepare α-zirconium phosphate.

[0038] B. Take 250 mL of 1 mol / L 2-hydroxyphosphonoacetic acid solution in a reactor, add 1.3 g of α-zirconium phosphate while stirring continuously, then add 4.7 g of aniline monomer, stir and disperse evenly to obtain a dispersion. Take 11.4 g of ammonium persulfate dissolved in 250 mL of 1 mol / L 2-hydroxyphosphonoacetic acid solution and add it to the dispersion. After mixing evenly, place it in an ice-water bath and react for 24 h. After the reaction is completed, filter under reduced pressure to separate the product, wash repeatedly with anhydrous ethanol and deionized water, and finally dry to prepare modified α-zirconium phosphate.

[0039] Example 3: A high-temperature resistant modified powder coating for power batteries, comprising the following components by weight: 44 parts of organosilicon-modified multifunctional epoxy resin prepared in Example 1, 5 parts of curing agent polyetheramine D230, 0.6 parts of leveling agent GLP588, 7 parts of inorganic pigment copper chromium black, 7 parts of glass powder, 2.5 parts of matting agent, 2.5 parts of modified α-zirconium phosphate prepared in Example 2, and 11 parts of silica powder.

[0040] The manufacturing process of the above-mentioned high-temperature resistant modified powder coating for power batteries includes the following steps: weighing each component according to the weight parts, mixing organosilicon modified epoxy resin, curing agent, leveling agent, inorganic pigment, glass powder, matting agent, modified α-zirconium phosphate and silica powder, and then performing melt extrusion through a twin-screw extruder, followed by cooling and pulverization, and then sieving through a 120-mesh sieve to prepare a high-temperature resistant modified powder coating for power batteries with uniform and fine particle size.

[0041] Example 4: A high-temperature resistant modified powder coating for power batteries, comprising the following components by weight: 57 parts of organosilicon-modified multifunctional epoxy resin prepared in Example 1, 10 parts of curing agent polyetheramine D230, 0.8 parts of leveling agent GLP588, 10 parts of inorganic pigment copper chromium black, 11 parts of glass powder, 4 parts of matting agent, 3.5 parts of modified α-zirconium phosphate prepared in Example 2, and 17 parts of silica powder.

[0042] The manufacturing process of the high-temperature resistant modified powder coating for power batteries described above is the same as in Example 3.

[0043] Example 5: A high-temperature resistant modified powder coating for power batteries, comprising the following components by weight: 66 parts of silicone-modified multifunctional epoxy resin prepared in Example 1, 14 parts of curing agent polyetheramine D230, 1 part of leveling agent GLP588, 13 parts of inorganic pigment copper chromium black, 14 parts of glass powder, 4.5 parts of matting agent, 5 parts of modified α-zirconium phosphate prepared in Example 2, and 22 parts of silica powder.

[0044] The manufacturing process of the high-temperature resistant modified powder coating for power batteries described above is the same as in Example 3.

[0045] Comparative Example 1: A high-temperature resistant modified powder coating for power batteries, comprising the following components by weight: 66 parts of silicone-modified epoxy resin prepared in Example 1, 14 parts of curing agent polyetheramine D230, 1 part of leveling agent GLP588, 13 parts of inorganic pigment copper chromium black, 14 parts of glass powder, 4.5 parts of matting agent, 5 parts of modified α-zirconium phosphate prepared in Example 2, and 22 parts of silica powder.

[0046] The manufacturing process of the high-temperature resistant modified powder coating for power batteries described above is the same as in Example 3.

[0047] Comparative Example 2: A high-temperature resistant modified powder coating for power batteries, comprising the following components by weight: 40 parts epoxy resin E51, 26 parts polymethylphenyl silicone resin, 14 parts curing agent polyetheramine D230, 1 part leveling agent GLP588, 13 parts inorganic pigment copper chromium black, 14 parts glass powder, 4.5 parts matting agent, 5 parts modified α-zirconium phosphate prepared in Example 2, and 22 parts silica powder.

[0048] The manufacturing process of the high-temperature resistant modified powder coating for power batteries described above is the same as in Example 3.

[0049] Comparative Example 3: A high-temperature resistant modified powder coating for power batteries, comprising the following components by weight: 66 parts of the organosilicon-modified multifunctional epoxy resin prepared in Example 1, 14 parts of curing agent polyetheramine D230, 1 part of leveling agent GLP588, 13 parts of inorganic pigment copper chromium black, 14 parts of glass powder, 4.5 parts of matting agent, 5 parts of α-zirconium phosphate, and 22 parts of silica powder.

[0050] The manufacturing process of the high-temperature resistant modified powder coating for power batteries described above is the same as in Example 3.

[0051] Performance testing

[0052] A 150×75×0.8mm iron plate was selected, and the working voltage of the electrostatic spray gun was adjusted to 40kV. The modified powder coatings prepared in Examples 3-5 and Comparative Examples 1-3 were then electrostatically sprayed and cured at a high temperature (200℃) to form a coating with a thickness of 150µm. Performance tests were performed: adhesion was determined using the cross-cut adhesion test according to GB / T 9286-2021; pencil hardness was determined according to GB / T 6739-2022; impact resistance was determined according to GB / T 1732-2020, and a high and low temperature cycling test (75~230℃) was conducted for 1500 cycles. The impact resistance after cycling was then measured to evaluate the high and low temperature resistance. The performance was also evaluated according to GB / T... Salt spray resistance was tested according to GB / T 2408-2021 to evaluate corrosion resistance; flame retardancy was determined according to GB / T 2408-2021; insulation withstand voltage was tested: DC 1000V, test for 10s, insulation resistance R ≥ 1GΩ was required; DC withstand voltage was tested for 3800V, test for 1min, leakage current was required to be less than 1mA. The data results are shown in Table 1.

[0053] Table 1 Sample performance test results

[0054]

[0055] As can be seen from the data results in Table 1, the modified powder coatings prepared in Examples 3-5 of the present invention have good adhesion, high hardness, good insulation and pressure resistance, and no significant change in impact resistance after high and low temperature cycling. They also have good high and low temperature resistance, as well as good corrosion resistance and flame retardant properties. In Comparative Example 1, the silicone-modified multifunctional epoxy resin was replaced with an equal amount of silicone-modified epoxy resin. In Comparative Example 2, epoxy resin and silicone resin were directly mixed. The adhesion, pencil hardness, impact resistance, and impact resistance after high and low temperature cycling of Comparative Examples 1-2 were found to be lower than those of Examples 3-5. This is because the multifunctionality of the epoxy resin increased the density of the coating, improved the adhesion, and provided good mechanical properties. It also better absorbed fracture energy and improved high and low temperature resistance. The limiting oxygen index and flame retardant rating of Comparative Example 2 were found to be significantly lower than those of Examples 3-5, indicating that the addition of silicone-modified multifunctional epoxy resin improved the flame retardant and fireproof performance of the coating. In Comparative Example 3, no α-zirconium phosphate was modified. The pencil hardness and impact resistance of Comparative Example 3 were slightly lower than those of Examples 3-5, possibly due to the agglomeration of α-zirconium phosphate leading to a decrease in mechanical properties. The salt spray resistance was found to be significantly lower than that of Examples 3-5, indicating that modification of α-zirconium phosphate significantly improved the corrosion resistance of the coating to a certain extent.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A high-temperature resistant modified powder coating for power batteries, characterized in that, The preparation method of the organic silicon modified multifunctional epoxy resin comprises the following steps: The organic silicon modified multifunctional epoxy resin is prepared by using the remaining one ungrafted silicon hydrogen bond in the organic silicon modified epoxy resin and the three-end vinyl silicone resin to carry out a silicon hydrogen addition reaction; The organic silicon modified multifunctional epoxy resin is prepared by using the remaining one ungrafted silicon hydrogen bond in the organic silicon modified epoxy resin and the three-end vinyl silicone resin to carry out a silicon hydrogen addition reaction; The organic silicon modified multifunctional epoxy resin is prepared by using the remaining one ungrafted silicon hydrogen bond in the organic silicon modified epoxy resin and the three-end vinyl silicone resin to carry out a silicon hydrogen addition reaction; The molar ratio of the phenyl tris(dimethylsiloxanyl)silane and the double-bonded DOPO-based epoxy compound is 1:2-2.1; 2. The high temperature resistant modified powder coating for power battery according to claim 1, characterized in that, The three-end vinyl silicone resin is prepared by using the phenyl tris(dimethylsiloxanyl)silane and the end vinyl silicone oil to carry out a silicon hydrogen addition reaction.

3. The high temperature resistant modified powder coating for power battery according to claim 1, characterized in that, The glass powder is a low-melting-point glass powder with a melting point of 400-500 DEG C.

4. The high temperature resistant modified powder coating for power battery according to claim 1, characterized in that, The curing agent is one of a phenolic curing agent, an amine curing agent and an acid anhydride curing agent; the leveling agent is a polyacrylate leveling agent; and the matting agent is a mixture of silicon dioxide, talcum powder and aluminum stearate, and the mass ratio of the silicon dioxide, the talcum powder and the aluminum stearate is 1:1:

1. The preparation method of the organic silicon modified multifunctional epoxy resin comprises the following steps: (1) 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide, epichlorohydrin and propylene glycol methyl ether are taken in a reactor, the temperature is raised to 60-70 DEG C, the pressure is reduced to 160 mmHg absolute pressure, then 50% sodium hydroxide aqueous solution is added within 0.5-1 h, after the addition is completed, the constant temperature reaction is continued for 30-40 min, after the reaction is completed, the DOPO-based epoxy compound is prepared by washing and distillation; (2) the DOPO-based epoxy compound, triethylamine and tetrahydrofuran are taken in a reactor, a mixed solution of acryloyl chloride and tetrahydrofuran is added at-10--5 DEG C, the stirring reaction is carried out for 3-4 h, then the reaction is continued at room temperature for 10-12 h, after the reaction is completed, the double-bonded DOPO-based epoxy compound is prepared by filtration, rotary evaporation and drying; (3) the phenyl tris(dimethylsiloxanyl)silane is taken in a reactor, the temperature is raised to 100-110 DEG C, the temperature is kept for 20-30 min, then the temperature is lowered to 95-105 DEG C, a mixed solution of chloroplatinic acid catalyst, the double-bonded DOPO-based epoxy compound and tetrahydrofuran is added, the reaction is carried out at 100-110 DEG C for 1-1.5 h, after the reaction is completed, the solvent is removed by rotary evaporation, and the organic silicon modified epoxy resin is prepared. (4) phenyl tris(dimethylsiloxanyl)silane and end-vinyl silicone oil are taken into a reactor, heated to 95-100 DEG C, and kept for 20-30 min, then cooled to 85-90 DEG C, and then chloroplatinic acid catalyst is added, and kept for 1-1.5 h to prepare a tri-end-vinyl silicone resin; (5) the tri-end-vinyl silicone resin is taken into a reactor, heated to 90-95 DEG C, and kept for 20-30 min, then chloroplatinic acid catalyst and silicone-modified epoxy resin are added, and kept for 3-4 h to prepare a silicone-modified multifunctional epoxy resin.

5. The high temperature resistant modified powder coating for power batteries according to claim 4, characterized in that, The molar ratio of 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide to epichlorohydrin in step (1) is 1:1-1.

3.

6. The high temperature resistant modified powder coating for power battery according to claim 4, characterized in that, The molar ratio of DOPO-based epoxy compound to acryloyl chloride in step (2) is 1:1-1.

2.

7. The high temperature resistant modified powder coating for power battery according to claim 1, characterized in that, The preparation method of the modified alpha-zirconium phosphate comprises the following steps: A. Zirconium oxychloride octahydrate and phosphoric acid are taken into a reactor, stirred uniformly, then hydrofluoric acid is added and stirred to obtain a white solution, and then the solution is refluxed at 95-105 DEG C for 20-24 h, cooled and settled after the reaction is completed, filtered, washed with deionized water until the pH is 5, and finally dried to prepare alpha-zirconium phosphate; B. 2-hydroxyphosphonoacetic acid solution is taken into a reactor, alpha-zirconium phosphate is added while stirring, then aniline monomer is added, stirred and dispersed uniformly to obtain a dispersion liquid, ammonium persulfate solution is added to the dispersion liquid, mixed uniformly, and then placed in an ice water bath and reacted for 20-24 h, the product is separated by filtration under reduced pressure after the reaction is completed, washed repeatedly with anhydrous ethanol and deionized water, and finally dried to prepare modified alpha-zirconium phosphate.

8. The high temperature resistant modified powder coating for power batteries according to claim 7, characterized in that, The concentration of the 2-hydroxyphosphonoacetic acid solution in step B is 0.9-1.3 mol / L, and the addition ratio of the 2-hydroxyphosphonoacetic acid solution, alpha-zirconium phosphate and aniline monomer in the dispersion liquid is 200-250 mL:1-1.5 g:4.5-5 g.

9. A manufacturing process of the high temperature resistant modified powder coating for power batteries according to any one of claims 1-8, characterized in that, The following steps are included: The components are weighed, the silicone-modified multifunctional epoxy resin, curing agent, leveling agent, inorganic pigment, glass powder, matting agent, modified alpha-zirconium phosphate and silicon powder are mixed, then melt-extruded through a double-screw extruder, and then cooled, crushed to prepare a high-temperature-resistant modified powder coating for power batteries.

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