High-temperature-resistant insulating plastic rubber shell for charger plug and processing technology of high-temperature-resistant insulating plastic rubber shell

Abstract

The invention relates to the field of organic polymer composite materials, in particular to a high-temperature-resistant insulating plastic shell for a charger plug and a processing technology thereof.The high-temperature-resistant insulating plastic shell is prepared from, by mass, 70-75 parts of modified polyphenylene sulfide, 20-25 parts of modified biphenyl-terephthaloyl chloride copolymer, 5-10 parts of modified methyl ricinoleate, 10-15 parts of modified boron nitride and the like. Intrinsic safety protection and long-acting stability of the material under extreme working conditions are realized through innovative introduction of a flame-retardant group, construction of a heat-conducting circuit and establishment of a toughening synergistic mechanism, compared with a traditional scheme, the environmental adaptability, durability and production controllability of a product are remarkably improved, and the technology can be widely applied to the field of high-density electronic equipment protection and has wide application prospects. Innovative guarantee is provided for reliable operation of electronic components, and wide industrialization prospects and wide application prospects are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of organic polymer composites, in particular to a high-temperature-resistant insulating plastic shell for a charger plug and a processing technology thereof. BACKGROUND

[0002] The charger plug plastic shell is an integrated electrical insulation protection component, mainly made of high-temperature-resistant engineering plastic composite material, and its core function is to provide insulation packaging and physical protection for metal pins. Its main structure includes plug fixing groove, stress buffer rib position and shell lock mechanism, which is integrally formed by precise injection molding. It is mainly used in consumer electronic power adapters, industrial equipment power supply interfaces and new energy vehicle charging gun high-voltage insulation protection.

[0003] In the prior art, the traditional charger plug shell mainly uses polycarbonate, nylon and other engineering plastics, which has a heat resistance temperature of 130 DEG C. When used under fast charging and high power, it is easy to soften and deform, resulting in poor plug contact or even short circuit. Moreover, the flame retardation effect is achieved by adding bromine-based flame retardants, but halogen releases toxic gases when heated, and migration and precipitation reduce long-term flame retardation. In addition, when used for a long time in a high-temperature and high-humidity environment, the insulation resistance drops sharply, and there is a risk of electrical breakdown.

[0004] Therefore, according to the related technology in the above, it is urgent to develop a high-temperature-resistant insulating plastic shell for a charger plug and a processing technology thereof. SUMMARY

[0005] Therefore, the present application aims to provide a high-temperature-resistant insulating plastic shell for a charger plug and a processing technology thereof to solve the problems of high-temperature failure, dependence on additives for flame retardation, short service life and pollution risk in the prior art.

[0006] Based on the above purpose, the present application provides a high-temperature-resistant insulating plastic shell for a charger plug and a processing technology thereof.

[0007] A high-temperature-resistant insulating plastic shell for a charger plug is composed of the following components by mass fraction: modified polyphenylene sulfide 70-75 parts, modified biphenyl-p- terephthaloyl chloride copolymer 20-25 parts, modified methyl ricinoleate 5-10 parts, modified boron nitride 10-15 parts, silane coupling alumina 5-8 parts, epoxy-thiol microcapsule 3-4 parts, nano-silica modified silicone 1-2 parts, anti-aging agent 0.5-0.8 parts, silicone master batch 1-1.5 parts, and composite oxidizing agent 0.3-0.5 parts.

[0008] The modified polyphenylene sulfide is DOPO modified polyphenylene sulfide.

[0009] The modified biphenyl-p-terephthaloyl chloride copolymer is triazine modified biphenyl-p-terephthaloyl chloride copolymer.

[0010] The modified castor oil acid methyl ester is DOPO modified castor oil acid methyl ester;

[0011] The anti-aging agent is a benzotriazole anti-aging agent, and the composite oxidant is a mixture of Irganox 1076 and Irgafos 168.

[0012] Preferably, the modified polyphenylene sulfide is prepared by the following method:

[0013] Step A1: under a nitrogen atmosphere, DOPO is added to 2-hydroxyethyl acrylate, heated to 100-120°C, and a catalyst p-toluenesulfonic acid and a polymerization inhibitor hydroquinone are added, reacted for 3-5 h, the reaction is completed, cooled to 50-70°C, purified with ethyl acetate, washed and dried, and distilled under reduced pressure to obtain DOPO acrylate monomer;

[0014] Step A2: polyphenylene sulfide powder is placed in an oven and dried at 110-130°C for 3-5 h, then placed in a high-speed mixer, DOPO acrylate monomer and initiator dicumyl peroxide are added, heated to 30-40°C, mixed for 15-20 min, and then placed in a twin-screw extruder, heated to 300-310°C, reacted for 90-100 s, extracted, dried, and the modified polyphenylene sulfide is obtained;

[0015] The mass ratio of DOPO, 2-hydroxyethyl acrylate, catalyst p-toluenesulfonic acid, and polymerization inhibitor hydroquinone is 1:0.4-0.5:0.004-0.006:0.0008-0.0012;

[0016] The mass ratio of polyphenylene sulfide, DOPO acrylate monomer, and initiator dicumyl peroxide is 1:0.06-0.08:0.001-0.0015.

[0017] Preferably, the modified polyphenylene sulfide is prepared by the following method:

[0018] Step B1: under a nitrogen atmosphere, diphenylamine and 2,4,6-tris(4-aminophenyl)-1,3,5-triazine are added to N-methylpyrrolidone solvent, heated to 40-60°C, stirred for 50-70 min, cooled to -2-2°C, and terephthaloyl chloride and catalyst pyridine are added, reacted for 3-5 h, the reaction is completed, and the prepolymer is obtained;

[0019] Step B2: under a nitrogen atmosphere, 4-phenylacetylene benzoic acid is added to the prepolymer, heated to 175-185°C, rotated at 250-350 rpm, reacted for 2.5-3.5 h, the reaction is completed, precipitated and washed, and dried to obtain the modified polyphenylene sulfide-terephthaloyl chloride copolymer;

[0020] The mass ratio of the biphenyl diamine, 2,4,6-tris (4-aminophenyl) -1,3,5-triazine, terephthaloyl chloride and the catalyst pyridine is 1:0.4-0.43:0.3-0.32:0.014-0.015;

[0021] The mass ratio of the prepolymer and 4-phenylacetylene benzoic acid is 1:0.035-0.04.

[0022] Preferably, the preparation method of the modified castor oil methyl ester is as follows:

[0023] Step C1: under the nitrogen atmosphere, the castor oil methyl ester and the catalyst tetrabutyl titanate are added into 1,4-butanediol, heated to 110-130℃, stirred for 50-70min, heated to 170-180℃, reacted for 3-4h, reduced to-0.095MPa, heated to 210-230℃, reacted for 1-3h, the reaction is completed, cooled to 70-80℃, to obtain the hydroxyl-terminated polyester prepolymer;

[0024] Step C2: under the nitrogen atmosphere, the DOPO is added into the tetrahydrofuran solvent, heated to 50-60℃, stirred and dissolved, the isophorone diisocyanate is added, heated to 70-80℃, reacted for 3-4h, the reaction is completed, vacuum distillation, to obtain the viscous liquid;

[0025] Step C3: the hydroxyl-terminated polyester prepolymer is added into the flask, heated to 70-80℃, the viscous liquid and the catalyst dibutyltin dilaurate are added, stirred and mixed, reacted for 1-3h, vacuum degassing, poured into the mold, heated to 110-130℃, aged for 2-4h, to obtain the modified castor oil methyl ester;

[0026] The mass ratio of the castor oil methyl ester, the catalyst tetrabutyl titanate and 1,4-butanediol is 1:0.0004-0.0006:0.3-0.4;

[0027] The mass ratio of the DOPO and the isophorone diisocyanate is 1:0.5-0.6;

[0028] The mass ratio of the hydroxyl-terminated polyester prepolymer, the viscous liquid and the catalyst dibutyltin dilaurate is 1:0.28-0.30:0.0001-0.0003;

[0029] The DOPO modified polyphenylene sulfide can be decomposed to generate phosphoric acid substances at high temperature, catalyze the dehydration of the polymer surface to form carbon, and form a dense coke layer to isolate oxygen and heat transfer. Meanwhile, the triazine modified biphenyl-terephthaloyl chloride copolymer can release nitrogen and other non-combustible gases by heating, thereby diluting the combustible concentration and interrupting the combustion chain reaction. In addition, through the synergistic relationship between the two, a P-N flame retardant system is formed, which builds a permanent fireproof barrier from the molecular level of the material and improves the flame retardancy of the material.

[0030] Preferably, the modified boron nitride preparation method is as follows:

[0031] Step D1: Add KH-560 silane coupling agent to anhydrous ethanol, warm to 20-30°C, stir for 8-12 min, add deionized water and glacial acetic acid, and stir for 20-40 min to obtain a silane hydrolysis solution;

[0032] Step D2: Under a nitrogen atmosphere, add boron nitride to a mixer, warm to 20-25°C, stir for 3-7 min, add the silane hydrolysis solution, warm to 70-90°C, stir and mix for 10-20 min, then warm to 110-130°C, and react for 20-40 min to obtain modified boron nitride;

[0033] The mass ratio of the KH-560 silane coupling agent, anhydrous ethanol, deionized water, and glacial acetic acid is 1:8-10:0.8-1.2:0.08-0.12;

[0034] The mass ratio of the boron nitride to the silane hydrolysis solution is 1:0.01-0.02;

[0035] After modification by the silane coupling agent, the boron nitride can be arranged in parallel in the matrix to form efficient heat channels, thereby improving the thermal conductivity efficiency. Meanwhile, spherical alumina can fill the gaps between the boron nitride, eliminate local hot spots, and enhance the uniformity of three-dimensional heat flow. In addition, the DOPO-modified polyphenylene sulfide and the triazine-modified copolymer of biphenyl-terephthaloyl chloride can maintain a rigid molecular chain structure at 200°C, resist thermal expansion deformation, thereby ensuring the stability of the heat conduction path and improving the heat resistance.

[0036] Preferably, the epoxy-thiol microcapsule preparation method is as follows:

[0037] Step E1: Add polyvinyl alcohol to deionized water, warm to 50-70°C, stir to dissolve, add urea and 37% wt formaldehyde solution, adjust the pH to 7.8-8.2, and stir to react for 50-70 min to obtain a wall material solution;

[0038] Step E2: Add bisphenol A epoxy resin to toluene solvent, warm to 50-70°C, stir to dissolve, cool to 30-40°C, add pentaerythritol tetrakis(3-mercaptopropionate) and the accelerator zinc acetylacetone, and stir for 15-25 min to obtain a core material solution;

[0039] Step E3: Add the core material solution to the wall material solution, warm to 50-60°C, stir to mix, pour into a high-speed disperser, rotate at 7000-800 rpm, emulsify for 10-15 min, cool to 35-45°C, reduce the rotation speed to 500-600 rpm, and stir for 20-40 min to obtain an emulsion;

[0040] Step E4: add the emulsion into the resorcinol solution, heat to 45-55℃, stir for 20-25min, add the ammonium chloride solution, heat to 60-70℃, react for 2-4h, the reaction is completed, cool to 20-30℃, adjust the pH to 7.0, filter and wash, dry, get epoxy-thiol microcapsules;

[0041] By forming a high-temperature resistant polymer with polyvinyl alcohol and urea and using it as a wall material, liquid epoxy resin and mercapto curing agent are encapsulated. When the shell is subjected to external force and microcracks are generated, the stress at the crack tip causes the microcapsules to break, releasing the repair agent to fill the gap, which is quickly crosslinked and cured at room temperature, thereby restoring the material's insulation and mechanical integrity and avoiding the expansion of cracks that could cause safety hazards and extend the product's life.

[0042] Preferably, the mass ratio of polyvinyl alcohol, urea and 37%wt formaldehyde solution in step E1 is 1:5.2-5.4:13-14;

[0043] The mass ratio of bisphenol A epoxy resin, pentaerythritol tetra(3-mercaptopropionate) and accelerator zinc acetylacetone in step E2 is 1:0.4-0.6:0.015-0.017.

[0044] Preferably, the mass ratio of core material solution to wall material solution in step E3 is 1:2.3-2.7;

[0045] The mass ratio of emulsion, resorcinol solution and ammonium chloride solution in step E4 is 1:0.007-0.009:0.02-0.04.

[0046] A processing technology for a high-temperature resistant insulating plastic shell of a charger plug, the processing technology is as follows:

[0047] Step S1: add modified polyphenylene sulfide, modified biphenyl-terephthaloyl chloride copolymer and modified castor oil acid methyl ester into a high-speed mixer, heat to 90-110℃, rotate at 300-500rpm, stir for 8-12min, add modified boron nitride, silane-coupled alumina, silicone masterbatch and composite antioxidant, rotate at 550-650rpm, stir for 6-10min, get the mixed material;

[0048] Step S2: put the mixed material into liquid nitrogen, freeze for 4-6min, add epoxy-thiol microcapsules, nano-silica modified silicone and anti-aging agent, cool to minus 60-50℃, stir for 1-3min, get the blended raw material;

[0049] Step S3: Place the blended raw materials in a drying tray, heat to 110-130 DEG C, dry for 2-4h, then put into an injection molding machine, injection molding for 40-50s, after molding, heat to 80-120 DEG C, react for 2-3h, then heat to 170-190 DEG C, solidify for 3-4h, after solidification, cool to 70-80 DEG C to obtain the high-temperature-resistant insulating plastic shell for the charger plug.

[0050] Preferably, the mass ratio of the modified polyphenylene sulfide, the modified biphenyl-terephthaloyl chloride copolymer, the modified methyl castor oil acid ester, the modified boron nitride, the silane coupling alumina, the silicone master batch and the composite antioxidant in step S1 is 14-14.5:5-5.1:1:2.8-3.2:1.3-1.4:0.3-0.35:0.07-0.08.

[0051] The mass ratio of the mixture, the epoxy-thiol microcapsule, the nano-silicon dioxide modified silicone and the anti-aging agent in step S2 is 100:4-4.5:1.5-1.6:0.8-0.9.

[0052] Advantages of the present application:

[0053] The present application provides a high-temperature-resistant insulating plastic shell for a charger plug and a preparation process thereof, which realizes intrinsic safety protection and long-term stability of the material under extreme working conditions by innovatively introducing a flame-retardant group, a heat-conducting circuit construction and the establishment of a toughening synergistic mechanism, significantly improves the environmental adaptability, durability and production controllability of the product compared with traditional solutions, and has a wide application prospect in the field of high-density electronic device protection, breaks through the performance boundary of insulating materials, reduces the risk of electronic system failure, provides innovative protection for the reliable operation of electronic components, and has a wide industrialization prospect. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with specific examples.

[0055] Example 1: The preparation method of the modified polyphenylene sulfide is as follows:

[0056] S1: Under a nitrogen atmosphere, 100g of DOPO is added to 40g of 2-hydroxyethyl acrylate, heated to 100 DEG C, 0.4g of catalyst p-toluenesulfonic acid and 0.08g of polymerization inhibitor hydroquinone are added, reacted for 5h, after reaction, cooled to 50- DEG C, purified with ethyl acetate, washed and dried, and distilled under reduced pressure to obtain DOPO acrylate monomer;

[0057] S2: 100 g of polyphenylene sulfide powder was placed in an oven, heated to 110°C, dried for 5 h, dried, placed in a high-speed mixer, 6 g of DOPO acrylate monomer and 0.1 g of initiator dicumyl peroxide were added, heated to 30°C, mixed for 20 min, placed in a twin-screw extruder, heated to 300°C, reacted for 100 s, extracted, dried, and modified polyphenylene sulfide was obtained.

[0058] Example 2: The preparation method of modified polyphenylene sulfide is as follows:

[0059] S1: Under a nitrogen atmosphere, 100 g of DOPO was added to 45 g of 2-hydroxyethyl acrylate, heated to 110°C, 0.5 g of catalyst p-toluenesulfonic acid and 0.1 g of polymerization inhibitor hydroquinone were added, reacted for 4 h, the reaction was completed, cooled to 60°C, purified with ethyl acetate, washed and dried, and distilled under reduced pressure to obtain DOPO acrylate monomer;

[0060] S2: 100 g of polyphenylene sulfide powder was placed in an oven, heated to 120°C, dried for 4 h, dried, placed in a high-speed mixer, 7 g of DOPO acrylate monomer and 0.12 g of initiator dicumyl peroxide were added, heated to 35°C, mixed for 17 min, placed in a twin-screw extruder, heated to 305°C, reacted for 95 s, extracted, dried, and modified polyphenylene sulfide was obtained.

[0061] Example 3: The preparation method of modified polyphenylene sulfide is as follows:

[0062] S1: Under a nitrogen atmosphere, 100 g of DOPO was added to 45 g of 2-hydroxyethyl acrylate, heated to 110°C, 0.5 g of catalyst p-toluenesulfonic acid and 0.1 g of polymerization inhibitor hydroquinone were added, reacted for 4 h, the reaction was completed, cooled to 60°C, purified with ethyl acetate, washed and dried, and distilled under reduced pressure to obtain DOPO acrylate monomer;

[0063] S2: 100 g of polyphenylene sulfide powder was placed in an oven, heated to 120°C, dried for 4 h, dried, placed in a high-speed mixer, 7 g of DOPO acrylate monomer and 0.12 g of initiator dicumyl peroxide were added, heated to 35°C, mixed for 17 min, placed in a twin-screw extruder, heated to 305°C, reacted for 95 s, extracted, dried, and modified polyphenylene sulfide was obtained.

[0064] Example 4: The preparation method of modified polyphenylene sulfide is as follows:

[0065] S1: Under a nitrogen atmosphere, 100 g of benzyl diamine and 40 g of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine were added to 200 mL of N-methylpyrrolidone solvent, the temperature was raised to 40°C, stirred for 70 min, cooled to -2°C, 30 g of terephthaloyl chloride and 1.4 g of catalyst pyridine were added, and the reaction was completed for 3 h to obtain a prepolymer;

[0066] S2: Under a nitrogen atmosphere, 3.5 g of 4-phenylethynyl benzoic acid was added to 100 g of the prepolymer, the temperature was raised to 175°C, the rotation speed was 350 rpm, and the reaction was carried out for 2.5 h. After the reaction was completed, the precipitate was precipitated, washed and dried to obtain a modified biphenyl-terephthaloyl chloride copolymer.

[0067] Example 5: The preparation method of modified biphenyl-terephthaloyl chloride copolymer is as follows:

[0068] S1: Under a nitrogen atmosphere, 100 g of benzyl diamine and 42 g of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine were added to 200 mL of N-methylpyrrolidone solvent, the temperature was raised to 50°C, stirred for 60 min, cooled to 0°C, 31 g of terephthaloyl chloride and 1.45 g of catalyst pyridine were added, and the reaction was completed for 4 h to obtain a prepolymer;

[0069] S2: Under a nitrogen atmosphere, 3.8 g of 4-phenylethynyl benzoic acid was added to 100 g of the prepolymer, and the temperature was raised to 180°C, the rotation speed was 300 rpm, and the reaction was carried out for 3 h. After the reaction was completed, the precipitate was precipitated, washed and dried to obtain a modified biphenyl-terephthaloyl chloride copolymer.

[0070] Example 6: The preparation method of modified biphenyl-terephthaloyl chloride copolymer is as follows:

[0071] S1: Under a nitrogen atmosphere, 100 g of benzyl diamine and 43 g of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine were added to 200 mL of N-methylpyrrolidone solvent, the temperature was raised to 60°C, stirred for 50 min, cooled to 2°C, 32 g of terephthaloyl chloride and 1.5 g of catalyst pyridine were added, and the reaction was completed for 3 h to obtain a prepolymer;

[0072] S2: Under a nitrogen atmosphere, add 4 g of 4-phenylethynyl benzoic acid to 100 g of the prepolymer, raise the temperature to 185°C, rotate at 250 rpm, and react for 3.5 h. After the reaction is complete, the precipitate is precipitated, washed, and dried to obtain a modified biphenyl-terephthaloyl chloride copolymer.

[0073] Example 7: The preparation method of modified ricinoleic acid methyl ester is as follows:

[0074] S1: 100 g of methyl ricinoleate and 0.04 g of catalyst tetrabutyl titanate were added to 30 g of 1,4-butanediol under a nitrogen atmosphere, warmed to 110°C, stirred for 70 min, warmed to 170°C, reacted for 4 h, reduced to -0.095 MPa, warmed to 210°C, reacted for 3 h, the reaction was completed, cooled to 70°C, and a hydroxyl-terminated polyester prepolymer was obtained;

[0075] S2: 100 g of DOPO was added to 200 mL of tetrahydrofuran solvent under a nitrogen atmosphere, warmed to 50°C, stirred to dissolve, 50 g of isophorone diisocyanate was added, warmed to 80°C, reacted for 3 h, the reaction was completed, and a viscous liquid was obtained by distillation under reduced pressure;

[0076] S3: 100 g of the hydroxyl-terminated polyester prepolymer was added to a flask, warmed to 70°C, 28 g of the viscous liquid and 0.01 g of catalyst dibutyltin dilaurate were added, stirred and mixed, reacted for 3 h, vacuum degassing, poured into a mold, warmed to 110°C, and cured for 4 h to obtain modified methyl ricinoleate.

[0077] Example 8: The preparation method of modified methyl ricinoleate is as follows:

[0078] S1: 100 g of methyl ricinoleate and 0.05 g of catalyst tetrabutyl titanate were added to 35 g of 1,4-butanediol under a nitrogen atmosphere, warmed to 120°C, stirred for 60 min, warmed to 175°C, reacted for 3.5 h, reduced to -0.095 MPa, warmed to 220°C, reacted for 2 h, the reaction was completed, and a hydroxyl-terminated polyester prepolymer was obtained by cooling to 75°C;

[0079] S2: 100 g of DOPO was added to 200 mL of tetrahydrofuran solvent under a nitrogen atmosphere, warmed to 55°C, stirred to dissolve, 55 g of isophorone diisocyanate was added, warmed to 75°C, reacted for 3.5 h, the reaction was completed, and a viscous liquid was obtained by distillation under reduced pressure;

[0080] S3: 100 g of the hydroxyl-terminated polyester prepolymer was added to a flask, warmed to 75°C, 29 g of the viscous liquid and 0.02 g of catalyst dibutyltin dilaurate were added, stirred and mixed, reacted for 2 h, vacuum degassing, poured into a mold, warmed to 120°C, and cured for 3 h to obtain modified methyl ricinoleate.

[0081] Example 9: The preparation method of modified methyl ricinoleate is as follows:

[0082] S1: Under a nitrogen atmosphere, 100 g of methyl ricinoleate and 0.06 g of tetrabutyl titanate catalyst were added to 40 g of 1,4-butanediol, the temperature was raised to 130°C, stirred for 50 min, the temperature was raised to 180°C, the reaction was carried out for 3 h, the pressure was reduced to -0.095 MPa, the temperature was raised to 230°C, the reaction was carried out for 1 h, and the reaction was completed, and the temperature was lowered to 80°C to obtain a hydroxyl-terminated polyester prepolymer;

[0083] S2: Under nitrogen atmosphere, add 100 g of DOPO to 200 mL of tetrahydrofuran solvent, heat to 60°C, stir to dissolve, add 60 g of isophorone diisocyanate, heat to 70°C, react for 4 h, and after the reaction is complete, distill under reduced pressure to obtain a viscous liquid;

[0084] S3: Add 100 g of hydroxyl-terminated polyester prepolymer into a flask, heat to 70°C, add 30 g of viscous liquid and 0.06 g of catalyst dibutyltin dilaurate, stir and mix, react for 1 h, vacuum degas, pour into a mold, heat to 130°C, and mature for 2 h to obtain modified methyl ricinoleate.

[0085] Example 10: The preparation method of modified boron nitride is as follows:

[0086] S1: Add 100g of KH-560 silane coupling agent to 800g of anhydrous ethanol, heat to 20°C, stir for 12min, add 80g of deionized water and 8g of glacial acetic acid, stir and hydrolyze for 20min to obtain a silane hydrolyzate;

[0087] S2: Under a nitrogen atmosphere, add 100g of boron nitride into a mixer, heat to 20°C, stir for 7min, add 1g of silane hydrolyzate, heat to 70°C, stir and mix for 20min, then heat to 110°C and react for 40min to obtain modified boron nitride.

[0088] Example 11: The preparation method of modified boron nitride is as follows:

[0089] S1: Add 100g of KH-560 silane coupling agent to 900g of anhydrous ethanol, heat to 25°C, stir for 10min, add 100g of deionized water and 10g of glacial acetic acid, stir and hydrolyze for 30min to obtain a silane hydrolyzate;

[0090] S2: Under a nitrogen atmosphere, add 100 g of boron nitride into a mixer, heat to 23°C, stir for 5 minutes, add 1.5 g of silane hydrolyzate, heat to 80°C, stir and mix for 15 minutes, then heat to 120°C and react for 30 minutes to obtain modified boron nitride.

[0091] Example 12: The preparation method of modified boron nitride is as follows:

[0092] S1: 100 g of KH-560 silane coupling agent was added to 1000 g of anhydrous ethanol, warmed to 30°C, stirred for 8 min, 120 g of deionized water and 12 g of glacial acetic acid were added, and hydrolysis was stirred for 40 min to obtain a silane hydrolysis solution;

[0093] S2: 100 g of boron nitride was added to a mixer under a nitrogen atmosphere, warmed to 25°C, stirred for 3 min, 2 g of silane hydrolysis solution was added, warmed to 90°C, stirred for 10 min, then warmed to 130°C, and reacted for 20 min to obtain modified boron nitride.

[0094] Example 13: The preparation method of epoxy-thiol microcapsules is as follows:

[0095] S1: 10 g of polyvinyl alcohol was added to 200 mL of deionized water, warmed to 50°C, stirred to dissolve, 52 g of urea and 130 g of 37% wt formaldehyde aqueous solution were added, the pH was adjusted to 7.8-8.2, and the reaction was stirred for 70 min to obtain a wall material solution;

[0096] S2: 100 g of bisphenol A epoxy resin was added to 200 mL of toluene solvent, warmed to 50°C, stirred to dissolve, cooled to 40°C, 40 g of pentaerythritol tetra(3-mercaptopropionate) and 1.5 g of accelerator zinc acetylacetone were added, and stirred for 15 min to obtain a core material solution;

[0097] S3: 100 g of the core material solution was added to 230 g of the wall material solution, warmed to 50°C, stirred and mixed, poured into a high-speed disperser, the speed was 8000 rpm, emulsified for 10 min, cooled to 45°C, the speed was reduced to 500 rpm, and stirred for 40 min to obtain an emulsion;

[0098] S4: 100 g of the emulsion was added to 0.7 g of resorcinol solution, warmed to 45°C, stirred for 25 min, 2 g of ammonium chloride solution was added, warmed to 60°C, reacted for 4 h, the reaction was completed, cooled to 20°C, the pH was adjusted to 7.0, suction filtered and washed, and dried to obtain epoxy-thiol microcapsules.

[0099] Example 14: The preparation method of epoxy-thiol microcapsules is as follows:

[0100] S1: 10 g of polyvinyl alcohol was added to 100 mL of deionized water, warmed to 60°C, stirred to dissolve, 53 g of urea and 135 g of 37% wt formaldehyde aqueous solution were added, the pH was adjusted to 7.8-8.2, and the reaction was stirred for 60 min to obtain a wall material solution;

[0101] S2: 100 g of bisphenol A epoxy resin was added to 200 mL of toluene solvent, warmed to 60°C, stirred and dissolved, cooled to 35°C, 50 g of pentaerythritol tetra(3-mercaptopropionate) and 1.6 g of accelerator zinc acetylacetone were added, stirred for 20 min, to obtain a core solution;

[0102] S3: 100 g of the core solution was added to 250 g of the wall solution, warmed to 55°C, stirred and mixed, poured into a high-speed dispersion machine, the speed was 7500 rpm, emulsified for 13 min, cooled to 40°C, the speed was reduced to 550 rpm, stirred for 30 min, to obtain an emulsion;

[0103] S4: 100 g of the emulsion was added to 0.8 g of resorcinol solution, warmed to 50°C, stirred for 23 min, 3 g of ammonium chloride solution was added, warmed to 65°C, reacted for 3 h, the reaction was completed, cooled to 25°C, the pH was adjusted to 7.0, suction filtered and washed, dried, to obtain epoxy-thiol microcapsules.

[0104] Example 15: The preparation method of epoxy-thiol microcapsules is as follows:

[0105] S1: 10 g of polyvinyl alcohol was added to 100 mL of deionized water, warmed to 70°C, stirred and dissolved, 54 g of urea and 140 g of 37% wt formaldehyde aqueous solution were added, the pH was adjusted to 7.8-8.2, stirred and reacted for 50 min, to obtain a wall solution;

[0106] S2: 100 g of bisphenol A epoxy resin was added to 100 mL of toluene solvent, warmed to 70°C, stirred and dissolved, cooled to 30°C, 60 g of pentaerythritol tetra(3-mercaptopropionate) and 1.7 g of accelerator zinc acetylacetone were added, stirred for 25 min, to obtain a core solution;

[0107] S3: 100 g of the core solution was added to 270 g of the wall solution, warmed to 60°C, stirred and mixed, poured into a high-speed dispersion machine, the speed was 7000 rpm, emulsified for 15 min, cooled to 35°C, the speed was reduced to 600 rpm, stirred for 20 min, to obtain an emulsion;

[0108] S4: The emulsion was added to a resorcinol solution, warmed to 45-55°C, stirred for 20-25 min, an ammonium chloride solution was added, warmed to 60-70°C, reacted for 2-4 h, the reaction was completed, cooled to 20-30°C, the pH was adjusted to 7.0, suction filtered and washed, dried, to obtain epoxy-thiol microcapsules.

[0109] Example 16: A processing technology of high-temperature-resistant insulating plastic shell for a charger plug

[0110] S1: 140g of modified polyphenylene sulfide, 50g of modified biphenyl- terephthaloyl chloride copolymer and 10g of modified methyl ricinoleate were added into a high-speed mixer, heated to 90°C, stirring at 500 rpm for 8 min, 28g of modified boron nitride, 13g of silane-coupled alumina, 3g of silicone masterbatch and 0.7g of composite antioxidant were added, stirring at 550 rpm for 10 min to obtain a mixture;

[0111] S2: 100g of the mixture was placed into liquid nitrogen and frozen for 4 min, 4g of epoxy-thiol microcapsules, 1.5g of nano-silica modified silicone and 0.8g of anti-aging agent were added, and the temperature was lowered to minus 60°C, stirring for 3 min to obtain a blending raw material;

[0112] S3: 100g of the blending raw material was placed in a drying tray and heated to 110°C, dried for 4h, then placed into an injection molding machine, and injection molded for 40s. After molding, the temperature was raised to 120°C, reacted for 2h, then raised to 190°C, and solidified for 3h. After solidification, the temperature was lowered to 80°C to obtain a high-temperature-resistant insulating plastic shell for a charger plug.

[0113] Example 17: A processing technology of a high-temperature-resistant insulating plastic shell for a charger plug

[0114] S1: 142g of modified polyphenylene sulfide, 50.5g of modified biphenyl- terephthaloyl chloride copolymer and 10g of modified methyl ricinoleate were added into a high-speed mixer, heated to 100°C, stirring at 400 rpm for 10 min, 30g of modified boron nitride, 13.5g of silane-coupled alumina, 3.2g of silicone masterbatch and 0.75g of composite antioxidant were added, stirring at 600 rpm for 8 min to obtain a mixture;

[0115] S2: 100g of the mixture was placed into liquid nitrogen and frozen for 5 min, 4.3g of epoxy-thiol microcapsules, 1.55g of nano-silica modified silicone and 0.85g of anti-aging agent were added, and the temperature was lowered to minus 55°C, stirring for 2 min to obtain a blending raw material;

[0116] S3: 100g of the blending raw material was placed in a drying tray and heated to 120°C, dried for 3h, then placed into an injection molding machine, and injection molded for 45s. After molding, the temperature was raised to 100°C, reacted for 2.5h, then raised to 180°C, and solidified for 3.5h. After solidification, the temperature was lowered to 75°C to obtain a high-temperature-resistant insulating plastic shell for a charger plug.

[0117] Example 18: A processing technology of a high-temperature-resistant insulating plastic shell for a charger plug

[0118] S1: 145 g of modified polyphenylene sulfide, 51 g of modified biphenyl- terephthaloyl chloride copolymer, and 10 g of modified methyl ricinoleate were added to a high-speed mixer, heated to 110°C, and stirred at 300 rpm for 12 min. Then, 32 g of modified boron nitride, 14 g of silane-coupled alumina, 3.5 g of silicone masterbatch, and 0.8 g of composite antioxidant were added, and stirred at 550 rpm for 10 min to obtain a mixture;

[0119] S2: 100 g of the mixture was placed in liquid nitrogen and frozen for 6 min. Then, 4.5 g of epoxy-thiol microcapsules, 1.6 g of nano-silicon dioxide modified silicone, and 0.9 g of anti-aging agent were added, and stirred at a temperature of -50°C for 1 min to obtain a blending raw material;

[0120] S3: 100 g of the blending raw material was placed in a drying tray and heated to 130°C for 2 h. Then, it was placed in an injection molding machine and molded for 50 s. After molding, the temperature was increased to 80°C, and reacted for 3 h. Then, the temperature was increased to 170°C, and solidified for 4 h. After solidification, the temperature was decreased to 70°C to obtain a high-temperature-resistant insulating plastic shell for a charger plug.

[0121] Comparative Example 1:

[0122] In this comparative example, modified boron nitride was not added in the preparation process of the high-temperature-resistant insulating plastic shell for a charger plug, and the other steps and parameters were the same as those in Example 16. The final high-temperature-resistant insulating plastic shell for a charger plug was obtained.

[0123] Comparative Example 2:

[0124] In this comparative example, only the "modified polyphenylene sulfide" was replaced with "polyphenylene sulfide", and the other steps and parameters were the same as those in Example 16. The final high-temperature-resistant insulating plastic shell for a charger plug was obtained.

[0125] Comparative Example 3:

[0126] In this comparative example, only the "epoxy-thiol microcapsules" were replaced with "ABS toughening agent", and the other steps and parameters were the same as those in Example 16. The final high-temperature-resistant insulating plastic shell for a charger plug was obtained.

[0127] Comparative Example 4:

[0128] In this comparative example, only the "modified methyl ricinoleate" was replaced with "thermoplastic polyurethane rubber", and the other steps and parameters were the same as those in Example 16. The final high-temperature-resistant insulating plastic shell for a charger plug was obtained.

[0129] Comparative Example 5:

[0130] The comparative example is compared with example 16 only to cancel the liquid nitrogen freezing mixing in the preparation process of the high-temperature-resistant insulating plastic shell for the charger plug, and the conventional 160°C melt blending is adopted, and the remaining steps and parameters are the same. The comparative example will not be repeated. Finally, the high-temperature-resistant insulating plastic shell for the charger plug is obtained.

[0131] Performance test:

[0132] Flame retardancy test:

[0133] Referring to the test standard of ASTM D3801, a UL94 combustion tester is used.

[0134] The plastic shells of examples 16-18 and comparative examples 1-5 are respectively taken, cut into standard samples 0.4mmx1.6mm, 5 samples in each group, the samples are vertically fixed, the lower end of the sample is contacted with the Bunsen burner flame for 10 seconds, the self-extinguishing time after leaving the fire and whether the below cotton wool is ignited are recorded, the ignition is repeated twice, and the V-0 / V-1 / V-2 level is determined according to the burning time / dripping.

[0135] Table 1

[0136] Item UL94 Rating Example 16 V-0 Example 17 V-0 Example 18 V-0 Comparative Example 1 V-1 Comparative Example 2 V-2 Comparative Example 3 V-1 Comparative Example 4 V-2 Comparative Example 5 V-1

[0137] Thermal conductivity test:

[0138] Referring to ASTM E1461 as the standard, a laser thermal conductivity instrument is used.

[0139] The plastic shells of examples 16-18 and comparative examples 1-5 are respectively taken, cut into Φ12.7x3mm round pieces, and the surface is coated with a graphite coating, which is respectively placed in three temperature zones of 25°C, 150°C and 200°C for testing. Under the laser pulse irradiation of the lower surface, the temperature rise curve of the upper surface is recorded by an infrared detector, and the thermal diffusivity α is calculated. The formula for calculating the thermal conductivity is:

[0140] λ=α·ρ·Cp

[0141] ρ: density; Cp: specific heat capacity

[0142] Table 2

[0143]

[0144]

[0145] Breaking test:

[0146] Referring to the standard of ASTM D5045, a universal material testing machine is used.

[0147] 1. Take the plastic shells of Examples 16-18 and Comparative Examples 1-5, respectively, to prepare single-edge notched samples, 60 x 12 x 4 mm, with a notch depth of 2.5 mm;

[0148] 2. Fix the samples at three points around the notch, load them to a crack expansion of 0.5 mm using three-point bending, and place them at 25°C for 24 h;

[0149] 3. Load them to fracture for the second time, and record the fracture strength σ2;

[0150] 4. Calculate the repair rate: (σ1 is the original sample strength)

[0151]

[0152] Table 3

[0153]

[0154]

[0155] High-temperature insulation performance:

[0156] Refer to the IEC 60112 standard, and use a CTI tester;

[0157] Take the plastic shells of Examples 16-18 and Comparative Examples 1-5, respectively, cut them into 15 x 15 x 4 mm samples, add 0.1% NH4Cl solution to the surface of the samples, set the electrode spacing to 4 mm, apply an alternating voltage of 100-600 V to the electrodes, increase the voltage by 25 V increments each time, record the lowest voltage value that causes a short circuit in 50 drops of the solution, heat to 200°C, and repeat the test after ultraviolet aging for 500 h.

[0158] Table 4

[0159] Item Initial CTI (V) CTI after 200°C aging (V) Attenuation rate (%) Example 16 625 605 3.2 Example 17 632 618 2.2 Example 18 645 630 2.3 Comparative Example 1 320 285 10.9 Comparative Example 2 285 230 19.3 Comparative Example 3 415 350 15.7 Comparative Example 4 380 295 22.4 Comparative Example 5 510 385 24.5

[0160] Tensile strength

[0161] Refer to the ASTM-D638 test standard, and use a universal material testing machine;

[0162] Take the plastic shells of Examples 16-18 and Comparative Examples 1-5, respectively, cut them into 25 mm x 4 mm x 0.05 mm, with 5 parallel samples in each group, set the tensile speed to 50 mm / min, set the clamp spacing to 20 mm, heat to 23 ± 2°C, and set the humidity to 50 ± 5%, and record the maximum tensile force (N) and the elongation at break (%);

[0163] Table 5

[0164] Item Maximum tensile force (N) Elongation at break (%) Example 16 76.3 8.2 Example 17 78.1 8.5 Example 18 75.8 7.9 Comparative Example 1 68.5 6.1 Comparative Example 2 65.2 5.3 Comparative Example 3 72.4 15.6 Comparative Example 4 70.8 22.3 Comparative Example 5 74.6 7.0

[0165] Data analysis:

[0166] As can be seen from Tables 1-5, the charger plug plastic shell prepared by the application has better flame retardance, insulation, high temperature resistance, self-repairing performance and mechanical properties;

[0167] In Comparative Example 1, the flame-retardant layer is damaged due to local overheating caused by the absence of modified boron nitride, and the flame-retardant performance and thermal conductivity are reduced. The reason is that the modified boron nitride can form efficient heat channels by parallel arrangement in the matrix, thereby improving the thermal conductivity efficiency. In addition, the spherical alumina can fill the gaps between the boron nitride and eliminate local hot spots to enhance the uniformity of three-dimensional heat flow. Moreover, the DOPO modified polyphenylene sulfide and the triazine modified copolymer of diphenyl-p-terephthalyl dichloride can maintain rigid molecular chain structure at 200°C to resist thermal expansion deformation, thereby ensuring the stability of the heat conduction path and improving the heat resistance.

[0168] In Comparative Example 2, the flame-retardant performance and thermal conductivity are reduced due to the replacement of the modified polyphenylene sulfide with polyphenylene sulfide. The reason is that the DOPO group is a flame-retardant group, and Comparative Example 2 does not have DOPO grafted and no phosphorus-based charring mechanism. The DOPO modified polyphenylene sulfide can generate phosphoric acid substances at high temperatures to catalyze the dehydration of the polymer surface to form carbon, thereby isolating oxygen and heat transfer. In addition, the triazine modified copolymer of diphenyl-p-terephthalyl dichloride can release nitrogen and other non-combustible gases to dilute the combustible gas concentration and interrupt the combustion chain reaction. Furthermore, through the synergistic relationship between the two, a P-N flame-retardant system is formed to build a permanent fireproof barrier at the molecular level of the material, thereby improving the flame retardance of the material. Moreover, the unmodified polyphenylene sulfide will carbonize to form a leakage path at high temperatures, thereby reducing the insulation.

[0169] In Comparative Example 3, the mechanical strength is reduced due to the replacement of the epoxy-thiol microcapsule with ABS toughening agent. The reason is that although the ABS toughening agent improves the toughness of the material, it sacrifices the rigidity of the material. However, the polyvinyl alcohol and urea form a high-temperature-resistant polymer, which can maintain the strength of the material at high temperatures. In addition, the liquid epoxy resin and mercapto curing agent are encapsulated, and when the shell is subjected to external force and microcracks occur, the stress at the crack tip causes the microcapsule to rupture, releasing the repair agent to fill the gap and rapidly cross-link and cure at room temperature, thereby restoring the insulation and mechanical integrity of the material and avoiding the expansion of cracks to cause safety hazards and prolong the service life of the product.

[0170] The insulation and mechanical strength of Comparative Example 4 are reduced due to the replacement of modified castor oil methyl ester with thermoplastic polyurethane rubber, the reason is that thermoplastic polyurethane rubber can absorb moisture in the air under high temperature aging condition, which leads to the increase of its electrical conductivity, and its over-soft toughness leads to its easy deformation during long-time use, while the modified castor oil toughening agent has lower elongation at break than thermoplastic polyurethane rubber by 62% while maintaining strength, which can well balance the strength and toughness, in addition, the interface bonding of thermoplastic polyurethane rubber with resin leads to the increase of thermal resistance, thereby leading to the small decrease of its thermal conductivity performance;

[0171] Comparative Example 5 has reduced flame retardant efficiency, weakened thermal conductivity and self-repairing performance, and decreased high-temperature insulation due to the cancellation of liquid nitrogen freezing mixing during the preparation of the high-temperature resistant insulating plastic shell for the charger plug, the reason is that high-temperature mixing can cause microcapsule rupture, thereby making the microcapsule release plasticizer in advance, reducing the flame retardant efficiency, and the filler agglomeration can block the heat flow, leading to the destruction of the internal thermal conduction network, affecting the thermal conduction efficiency, in addition, the damaged microcapsule reduces the self-repairing material, thereby affecting the self-repairing efficiency of the material, and the broken microcapsule releases some ionic impurities, leading to the decrease of the insulation of the material.

[0172] Those skilled in the art should understand that the discussion of the above any embodiment is only exemplary, and is not intended to imply that the scope of the present application is limited to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in details for the sake of brevity.

[0173] The present application is intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any and all such modifications, variations or equivalents that fall within the spirit and scope of the application are intended to be embraced by the claims.

Claims

1. A high temperature resistant insulating plastic shell for a charger plug, characterized in that: The invention is composed of the following components in parts by mass: 70-75 parts of modified polyphenylene sulfide, 20-25 parts of modified biphenyl-terephthaloyl chloride copolymer, 5-10 parts of modified ricinoleic acid methyl ester, 10-15 parts of modified boron nitride, 5-8 parts of silane-coupled alumina, 3-4 parts of epoxy-thiol microcapsules, 1-2 parts of nano-silica modified silicone, 0.5-0.8 parts of anti-aging agent, 1-1.5 parts of silicone masterbatch, and 0.3-0.5 parts of composite oxidant; The modified polyphenylene sulfide is DOPO modified polyphenylene sulfide; The modified biphenyl-terephthaloyl chloride copolymer is a triazine-modified biphenyl-terephthaloyl chloride copolymer; The modified ricinoleic acid methyl ester is DOPO modified ricinoleic acid methyl ester.

2. The high temperature resistant insulating plastic shell for a charger plug according to claim 1, characterized in that: The modified polyphenylene sulfide preparation method is as follows: Step A1: Under a nitrogen atmosphere, DOPO is added to 2-hydroxyethyl acrylate, the temperature is raised to 100-120°C, p-toluenesulfonic acid as a catalyst and hydroquinone as a polymerization inhibitor are added, and the reaction is carried out for 3-5 hours. After the reaction is complete, the temperature is lowered to 50-70°C, purified with ethyl acetate, washed, dried, and distilled under reduced pressure to obtain DOPO acrylate monomer; Step A2: Place the polyphenylene sulfide powder in an oven, heat it to 110-130°C, and dry it for 3-5 hours. After drying, place it in a high-speed mixer, add DOPO acrylate monomer and initiator dicumyl peroxide, heat it to 30-40°C, mix it for 15-20 minutes, place it in a twin-screw extruder, heat it to 300-310°C, react it for 90-100 seconds, extract it, and dry it to obtain modified polyphenylene sulfide; The mass ratio of the DOPO, 2-hydroxyethyl acrylate, catalyst p-toluenesulfonic acid and polymerization inhibitor hydroquinone is 1:0.4-0.5:0.004-0.006:0.0008-0.0012; The mass ratio of the polyphenylene sulfide, DOPO acrylate monomer and initiator dicumyl peroxide is 1:0.06-0.08:0.001-0.0015.

3. The high temperature resistant insulating plastic shell for a charger plug according to claim 1, characterized in that: The preparation method of the modified biphenyl-terephthaloyl chloride copolymer is as follows: Step B1: Under a nitrogen atmosphere, add benzyl diamine and 2,4,6-tris(4-aminophenyl)-1,3,5-triazine to N-methylpyrrolidone solvent, heat to 40-60°C, stir for 50-70 minutes, cool to -2-2°C, add terephthaloyl chloride and catalyst pyridine, and react for 3-5 hours. The reaction is complete to obtain a prepolymer; Step B2: Under a nitrogen atmosphere, add 4-phenylethynylbenzoic acid to the prepolymer, raise the temperature to 175-185° C., rotate at 250-350 rpm, and react for 2.5-3.5 hours. After the reaction is complete, a precipitate is precipitated, washed, and dried to obtain a modified biphenyl-terephthaloyl chloride copolymer; The mass ratio of the benzyl diamine, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, terephthaloyl chloride and catalyst pyridine is 1:0.4-0.43:0.3-0.32:0.014-0.015; The mass ratio of the prepolymer to 4-phenylethynylbenzoic acid is 1:0.035-0.

04.

4. The high temperature resistant insulating plastic shell for a charger plug according to claim 1, characterized in that: The preparation method of the modified ricinoleic acid methyl ester is as follows: Step C1: Under a nitrogen atmosphere, methyl ricinoleate and tetrabutyl titanate catalyst are added to 1,4-butanediol, the temperature is raised to 110-130°C, stirred for 50-70 minutes, the temperature is raised to 170-180°C, the reaction is carried out for 3-4 hours, the pressure is reduced to -0.095 MPa, the temperature is raised to 210-230°C, the reaction is carried out for 1-3 hours, and after the reaction is completed, the temperature is lowered to 70-80°C to obtain a hydroxyl-terminated polyester prepolymer; Step C2: Under a nitrogen atmosphere, add DOPO to tetrahydrofuran solvent, heat to 50-60°C, stir to dissolve, add isophorone diisocyanate, heat to 70-80°C, react for 3-4 hours, and after the reaction is complete, distill under reduced pressure to obtain a viscous liquid; Step C3: Add the hydroxyl-terminated polyester prepolymer to a flask, heat it to 70-80°C, add the viscous liquid and the catalyst dibutyltin dilaurate, stir and mix, react for 1-3 hours, vacuum degas, pour into a mold, heat it to 110-130°C, and mature it for 2-4 hours to obtain modified ricinoleic acid methyl ester; The mass ratio of methyl ricinoleate, catalyst tetrabutyl titanate and 1,4-butanediol is 1:0.0004-0.0006:0.3-0.4; The mass ratio of DOPO to isophorone diisocyanate is 1:0.5-0.6; The mass ratio of the hydroxyl-terminated polyester prepolymer, the viscous liquid and the catalyst dibutyltin dilaurate is 1:0.28-0.30:0.0001-0.0003.

5. The high temperature resistant insulating plastic shell for a charger plug according to claim 1, characterized in that: The modified boron nitride preparation method is as follows: Step D1: Add KH-560 silane coupling agent to anhydrous ethanol, heat to 20-30°C, stir for 8-12 minutes, add deionized water and glacial acetic acid, stir and hydrolyze for 20-40 minutes to obtain a silane hydrolyzate; Step D2: Under a nitrogen atmosphere, add boron nitride to a mixer, heat to 20-25°C, stir for 3-7 minutes, add silane hydrolyzate, heat to 70-90°C, stir and mix for 10-20 minutes, then heat to 110-130°C, react for 20-40 minutes to obtain modified boron nitride; The mass ratio of the KH-560 silane coupling agent, anhydrous ethanol, deionized water and glacial acetic acid is 1:8-10:0.8-1.2:0.08-0.12; The mass ratio of the boron nitride to the silane hydrolyzate is 1:0.01-0.

02.

6. The high temperature resistant insulating plastic shell for a charger plug according to claim 1, characterized in that: The preparation method of the epoxy-thiol microcapsules is as follows: Step E1: Add polyvinyl alcohol to deionized water, heat to 50-70°C, stir to dissolve, add urea and 37% wt formaldehyde aqueous solution, adjust the pH to 7.8-8.2, and stir to react for 50-70 minutes to obtain a wall material solution; Step E2: Add bisphenol A epoxy resin to toluene solvent, heat to 50-70° C., stir to dissolve, cool to 30-40° C., add pentaerythritol tetrakis(3-mercaptopropionate) and accelerator zinc acetylacetonate, and stir for 15-25 minutes to obtain a core material solution; Step E3: Add the core material solution to the wall material solution, heat to 50-60°C, stir and mix, pour into a high-speed disperser, rotate at 7000-800 rpm, emulsify for 10-15 minutes, cool to 35-45°C, reduce the speed to 500-600 rpm, and stir for 20-40 minutes to obtain an emulsion; Step E4: Add the emulsion to the resorcinol solution, heat to 45-55°C, stir for 20-25 minutes, add ammonium chloride solution, heat to 60-70°C, react for 2-4 hours, and after the reaction is complete, cool to 20-30°C, adjust the pH to 7.0, filter, wash, and dry to obtain epoxy-thiol microcapsules.

7. The high temperature resistant insulating plastic shell for a charger plug according to claim 6, characterized in that: In step E1, the mass ratio of polyvinyl alcohol, urea and 37% wt formaldehyde solution is 1:5.2-5.4:13-14; In step E2, the ratio of bisphenol A epoxy resin, pentaerythritol tetrakis(3-mercaptopropionate) and accelerator zinc acetylacetonate is 1:0.4-0.6:0.015-0.

017.

8. The high temperature resistant insulating plastic shell for a charger plug according to claim 6, characterized in that: In step E3, the mass ratio of the core material solution to the wall material solution is 1:2.3-2.7; In step E4, the mass ratio of the emulsion, the resorcinol solution, and the ammonium chloride solution is 1:0.007-0.009:0.02-0.

04.

9. A process for processing a high-temperature resistant insulating plastic shell for a charger plug according to any one of claims 1 to 8, characterized in that: The processing technology is as follows: Step S1: adding modified polyphenylene sulfide, modified biphenyl-terephthaloyl chloride copolymer and modified ricinoleic acid methyl ester into a high-speed mixer, heating to 90-110° C., rotating at 300-500 rpm, stirring for 8-12 minutes, adding modified boron nitride, silane-coupled alumina, silicone masterbatch and composite antioxidant, rotating at 550-650 rpm, stirring for 6-10 minutes, and obtaining a mixed material; Step S2: placing the mixed material in liquid nitrogen and freezing for 4-6 minutes, adding epoxy-thiol microcapsules, nano-silica modified silicone and anti-aging agent, cooling to -60-50°C, and stirring for 1-3 minutes to obtain a blended raw material; Step S3: Place the blended raw materials on a drying tray, heat to 110-130°C, dry for 2-4 hours, then place in an injection molding machine, injection mold for 40-50 seconds, and after molding is completed, heat to 80-120°C, react for 2-3 hours, then heat to 170-190°C, cure for 3-4 hours, and after curing is completed, cool to 70-80°C to obtain a high-temperature resistant insulating plastic shell for a charger plug.

10. The processing technology of a high temperature resistant insulating plastic shell for a charger plug according to claim 9, characterized in that: The mass ratio of the modified polyphenylene sulfide, modified biphenyl-terephthaloyl chloride copolymer, modified ricinoleic acid methyl ester, modified boron nitride, silane-coupled alumina, silicone masterbatch and composite antioxidant in step S1 is 14-14.5:5-5.1:1:2.8-3.2:1.3-1.4:0.3-0.35:0.07-0.08; The mass ratio of the mixed material, epoxy-thiol microcapsules, nano-silica modified silicone and anti-aging agent in step S2 is 100:4-4.5:1.5-1.6:0.8-0.9.

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