New energy automobile high-voltage wiring harness connector silica gel gasket and preparation method thereof

Abstract

The invention relates to the technical field of silica gel gaskets, in particular to a new energy automobile high-voltage wiring harness connector silica gel gasket and a preparation method thereof.The new energy automobile high-voltage wiring harness connector silica gel gasket is prepared from, by weight, base rubber, filler, chlorosulfonated polyethylene, 2-acrylamido-2-methylpropanesulfonic acid, silica powder, an oil-resistant agent, molybdenum disulfide, a vulcanizing agent and a cross-linking agent; the oil-resistant agent is composed of calcium carbonate, activated zinc oxide and modified epoxidized soybean oil according to the weight ratio of (5-10): (4-6): 3; the new energy automobile high-voltage wiring harness connector silica gel gasket prepared according to the formula has good strength, wear resistance and oil resistance. When the gasket is in contact with oil pollution, the phenomenon of expansion, deformation or performance reduction cannot occur easily, the stability of the original sealing structure of the gasket is ensured, and oil substances are effectively prevented from damaging the sealing effect; in the face of various friction and mechanical stress in the using process of a vehicle, the gasket can effectively resist damage and scratch, and sealing performance reduction caused by surface abrasion is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of silica gel gaskets, in particular to a silica gel gasket for a high-voltage wiring harness connector of a new energy vehicle and a preparation method. BACKGROUND

[0002] The high-voltage wiring harness connector is distributed in various parts of the new energy vehicle, and is subjected to complex working environments and risks of erosion by water, dust and the like. In order to avoid the erosion risks of water, dust and the like, the silica gel gasket can be installed on the surface of the connector and the wiring harness. The silica gel gasket has good elasticity and flexibility, can closely fit the surface of the connector and the wiring harness, effectively fill the gap between the two, and thus achieve a good sealing effect, prevent water, dust and the like from entering the inside of the connector, and ensure the normal operation of the high-voltage system.

[0003] However, it is found in the use process that the strength of the silica gel material itself is relatively low, and the tear resistance is not ideal. Under the complex working conditions such as vibration during vehicle driving, frequent plugging and unplugging of the wiring harness, and friction with other components, the silica gel gasket is prone to damage, scratches and the like. Once the gasket is damaged, the sealing effect will be greatly reduced, and water and dust will have a chance to enter, thereby causing connector failure and affecting the normal operation of the vehicle. Secondly, the wear resistance of the silica gel material needs to be improved. In the complex use environment, the silica gel gasket will inevitably be rubbed with various objects, and the low wear resistance makes the surface of the gasket prone to wear marks, which not only reduces the sealing performance, but also may cause pollution to the inside of the connector due to the tiny particles generated by wear, further affecting the reliability of the high-voltage system.

[0004] Meanwhile, in the actual use of the new energy vehicle, the connector may come into contact with various oil stains and chemical substances, such as lubricating oil and cooling liquid in the engine compartment. When the silica gel gasket comes into contact with these oil substances, it is prone to swelling, deformation or performance degradation. Such changes will destroy the original sealing structure of the gasket, cause sealing failure, and enable harmful substances such as water and dust to easily enter the inside of the connector, seriously threatening the insulation performance and overall safety of the high-voltage system. SUMMARY

[0005] In order to solve the problems of low strength, low wear resistance and poor oil resistance of the silica gel, the application provides a silica gel gasket for a high-voltage wiring harness connector of a new energy vehicle and a preparation method.

[0006] In a first aspect, the application provides a silica gel gasket for a high-voltage wiring harness connector of a new energy vehicle, which adopts the following technical solution: A silica gel gasket for a high-voltage wiring harness connector of a new energy vehicle is prepared from the following raw materials by weight: Base glue 100 parts Filler 20-30 parts Chlorosulfonated polyethylene 6-10 parts 2-acrylamido-2-methylpropane sulfonic acid 4-8 parts Silicon powder 5-10 parts Oil resistant agent 6-12 parts Molybdenum disulfide 4-6 parts Vulcanizing agent 1-2 parts Crosslinking agent 1-2 parts The oil resistant agent is composed of calcium carbonate, active zinc oxide and modified epoxy soybean oil in a weight ratio of (5-10):(4-6):3. The filler includes at least one of white carbon black, silicon dioxide, quartz stone, talc powder, silicon nitride, silicon carbide and ceramic powder.

[0007] By adopting the above technical scheme, the new energy automobile high-voltage wire harness connector silica gel gasket has good strength, wear resistance and oil resistance. When contacting oil pollution, it will not easily swell, deform or have performance decline, ensuring the stability of the original sealing structure of the gasket and effectively preventing oil substances from damaging the sealing effect. At the same time, when facing various friction and mechanical stress in the use process of the vehicle, the gasket can effectively resist damage and scratches, reducing the sealing performance decline caused by surface wear.

[0008] In the present application, the oil resistant agent composed of calcium carbonate, active zinc oxide and modified epoxy soybean oil in a specific ratio cooperates with other ingredients such as base glue, so that when the silica gel gasket contacts oil stains such as lubricating oil and coolant in the engine compartment and chemical substances, it can resist their erosion and avoid swelling, deformation or performance decline, ensuring the stability of the gasket sealing structure and preventing harmful substances such as water and dust from entering the connector interior, thereby effectively guaranteeing the insulation performance and overall safety of the high-voltage system and meeting the needs of new energy vehicles in various actual use environments.

[0009] By adding ingredients such as chlorosulfonated polyethylene, the strength and tear resistance of the silica gel gasket are significantly enhanced. Chlorosulfonated polyethylene has good elasticity and tear resistance, and after being added, it interacts with the silica gel matrix to form a composite structure with reinforcing effect. At the same time, fillers such as white carbon black and silicon dioxide also provide support and reinforcement to the silica gel matrix, limiting the movement of molecular chains, so that the silica gel gasket can effectively resist damage and scratches when facing complex working conditions such as vibration during vehicle driving, frequent plugging of wire harness and friction with other parts, reducing the risk of sealing failure.

[0010] The fillers and molybdenum disulfide play a good wear-resistant synergistic effect in the silica gel gasket. The quartzite and talcum powder in the fillers have high hardness, forming a wear-resistant protective layer on the surface of the silica gel, which can effectively resist the wear caused by friction. Molybdenum disulfide has good lubricating properties, reducing the friction coefficient between the silica gel gasket and other components, reducing the friction force, and further reducing the wear phenomenon. This not only prolongs the service life of the silica gel gasket, but also reduces the pollution caused by the tiny particles generated by wear to the inside of the connector, improving the reliability of the high-pressure system.

[0011] Preferably, the base glue is composed of methyl vinyl silicone rubber and carboxylated butyl rubber in a weight ratio of (4-7):2.

[0012] By adopting the above technical scheme, the carboxylated butyl rubber has good resistance to oil substances, which can reduce the erosion and influence of oil on the silica gel gasket. After being matched with methyl vinyl silicone rubber, the oil resistance of the silica gel gasket is further enhanced, so that it is not easy to swell, deform or degrade in performance. At the same time, the carboxylated butyl rubber has high tensile strength and good tear resistance, and the methyl vinyl silicone rubber provides good elasticity, so that the combination of the two can significantly improve the strength and tear resistance of the silica gel gasket, better resist the damage caused by vibration, wire harness plugging and component friction during vehicle driving, reduce the risk of gasket damage, and ensure the durability of the sealing effect.

[0013] Preferably, the carboxylated butyl rubber has a hydroxyl content of 0.43-0.65 mol / Kg, a number average molecular weight of 1900-2800, and a viscosity of 7-90 Pa.s at 40℃.

[0014] Preferably, the methyl vinyl silicone rubber has a vinyl molar content of 0.09-0.55%, and a weight average molecular weight of 550000-950000.

[0015] By adopting the above technical scheme, the high weight average molecular weight of the methyl vinyl silicone rubber makes the molecular chain tight, reduces the diffusion coefficient of oil substances, and reduces the risk of being immersed and penetrated by oil. The hydroxyl content and number average molecular weight of the carboxylated butyl rubber enable it to resist swelling and deformation caused by oil, and the moderate viscosity is good in anti-flow and deformation ability in an oil environment. The combination of the two improves the oil resistance of the silica gel gasket, ensuring its sealing effect and service life in an oil environment. At the same time, the combination of the two further enhances the tensile strength and wear resistance of the silica gel gasket, so that it is not easy to break, damage, etc., ensuring the integrity and sealing performance of the gasket.

[0016] Preferably, the average molecular weight of the chlorosulfonated polyethylene is 30000-120000.

[0017] By adopting the above technical scheme, the average molecular weight of chlorosulfonated polyethylene is optimized, the resistance of the silica gel gasket to absorption and penetration of oil substances is further improved, and expansion, deformation or performance degradation of the silica gel gasket is better prevented. At the same time, chlorosulfonated polyethylene in this molecular weight range can improve the strength and wear resistance of the silica gel gasket while maintaining good elasticity and flexibility. This enables the gasket to closely fit the surface of the connector and the wire harness during installation and use, effectively filling the gap, and also prevents installation difficulties due to insufficient elasticity or stress concentration due to poor flexibility, thereby ensuring sealing effect while meeting the requirements of high-voltage wire harness connectors for elasticity and flexibility under different working conditions.

[0018] Preferably, the silica powder is spherical silica powder, the particle size of the spherical silica powder is 0.1-10 microns, and the specific surface area is 50-100 m 2 / g.

[0019] By adopting the above technical scheme, the spherical particles are uniformly dispersed in the silica gel matrix, can uniformly transfer and disperse the stress generated by friction, avoid stress concentration, reduce the risk of local excessive wear, and improve the overall wear resistance of the gasket. At the same time, the spherical silica powder with a particle size of 0.1-10 microns can effectively fill the silica gel matrix, provide good support, enhance the strength of the silica gel gasket, make it more resistant to deformation and rupture, and maintain the sealing effect.

[0020] Preferably, the filler is a hyperbranched polyester resin filler, which is pretreated by the following method: 1) Mix the filler, fluorine-containing silane coupling agent and acetone, ultrasonic for 30-40 min, filter to obtain a silanized filler mixture; 2) Add hyperbranched polyester resin and p-toluenesulfonic acid to the silanized filler mixture, heat the mixture to 60-65 DEG C under nitrogen atmosphere, stir at a speed of 300 r / min for 4-5 h, filter and separate, elute and dry to obtain the hyperbranched polyester resin filler.

[0021] Preferably, the weight parts of the raw materials used to prepare the hyperbranched polyester resin filler are as follows: Filler 100 parts Fluorine-containing silane coupling agent 10-15 parts Acetone 50-70 parts Hyperbranched polyester resin 20-30 parts p-toluenesulfonic acid 0.5-1 part.

[0022] Firstly, the synergistic effect of fluorine-containing silane coupling agent and hyperbranched polyester resin gives the filler certain oil resistance, so that the performance of the filler will not deteriorate significantly when it comes into contact with oil stains such as lubricating oil, coolant and chemicals, thereby improving the sealing effect of the silica gel gasket in complex oil stain environment, ensuring the insulation performance and overall safety of the high-voltage system.

[0023] Secondly, through the treatment of fluorine-containing silane coupling agent, a layer of fluorine-containing layer with low surface energy can be formed on the surface of the filler, effectively reducing the interfacial tension between the filler and the silica gel matrix, making the filler more uniformly dispersed in the silica gel matrix, and the compatibility between the two is better, which improves the overall strength and mechanical properties of the silica gel gasket, enhances its anti-breakage and anti-tear capacity under complex working conditions such as vibration and friction, and reduces the problem of local performance weakness caused by filler agglomeration.

[0024] Finally, the introduction of hyperbranched polyester resin has a unique molecular structure with multiple active functional groups. These functional groups can chemically react or physically entangle with active groups in the silica gel matrix and on the surface of the filler, forming a more compact and stable network structure, which further improves the wear resistance of the silica gel gasket. Even under long-term friction, it can maintain good sealing integrity, reduce the tiny particles generated by wear, and reduce the risk of pollution to the inside of the connector.

[0025] Preferably, the hydroxyl value of the hyperbranched polyester resin is 540-590mg KOH / g.

[0026] By adopting the above technical solution, the hydroxyl value of the hyperbranched polyester resin is optimized. On the one hand, the interfacial bonding force between the filler and the silica gel matrix is significantly enhanced, making the filler more uniformly dispersed in the silica gel matrix, effectively improving the strength and tear resistance of the silica gel gasket, and making it more difficult to break under complex working conditions. On the other hand, the high density of hydroxyl groups also increases the reactivity of the filler and the fluorine-containing silane coupling agent, making the fluorine-containing layer on the surface of the filler more compact and stable, and further improving the oil resistance of the silica gel gasket.

[0027] Secondly, the application provides a preparation method of a silica gel gasket for a high-voltage wiring harness connector of a new energy vehicle, which adopts the following technical solution: A preparation method of a silica gel gasket for a high-voltage wiring harness connector of a new energy vehicle, comprising the following preparation steps: S1, mixing the base glue, filler, chlorosulfonated polyethylene, 2-acrylamido-2-methylpropane sulfonic acid, silicon powder, oil-resistant agent, molybdenum disulfide, vulcanizing agent and crosslinking agent by internal mixing to obtain a mixed glue; S2, rolling the mixed glue on an open mill and placing it at room temperature for 3-5h to obtain a sheet; S3, three-stage vulcanization of the sheet to obtain a silica gel gasket for a high-voltage wiring harness connector of a new energy vehicle; The temperature of the first vulcanization is 180-200℃, and the time is 30-40min; The temperature of the second vulcanization is 150-160℃, and the time is 60-80min; The temperature of the third vulcanization is 200-210℃, and the time is 1-2h.

[0028] By adopting the above technical scheme, it is ensured that the base glue and other additives are fully mixed to form a uniform mixed glue, which helps to improve the overall performance consistency of the silicone rubber gasket. Through three-stage vulcanization, the cross-linking structure is further optimized at high temperature, so that the silicone rubber gasket achieves an excellent balance in strength, sealing performance, wear resistance and oil resistance, etc., meets the use requirements of the new energy vehicle high-voltage wire harness connector under complex working conditions, and guarantees the stable operation and safety of the high-voltage system.

[0029] In summary, the present application has the following beneficial effects: 1、In the present application, the oil resistance agent is composed of calcium carbonate, active zinc oxide and modified epoxy soybean oil in a specific proportion, which gives the gasket excellent oil resistance. When the gasket comes into contact with oil, coolant and other contaminants and chemicals, it can effectively resist corrosion, prevent swelling, deformation and performance degradation, maintain the stability of the sealing structure, prevent harmful substances from entering the connector, and ensure the insulation and safety of the high-voltage system. The addition of chlorosulfonated polyethylene and fillers such as white carbon black and silicon dioxide greatly enhances the strength and tear resistance of the gasket. They form a reinforced composite structure with the silicone rubber matrix, limiting the movement of molecular chains, effectively resisting damage and scratches under complex working conditions such as vehicle vibration, wire harness insertion and removal, and component friction, reducing the risk of sealing failure. The fillers and molybdenum disulfide synergistically enhance the wear-resistant protective layer on the surface of the silicone rubber, and the molybdenum disulfide reduces the friction coefficient with its lubricating properties, reduces wear and tear, prolongs the service life, reduces the pollution caused by wear particles, and improves the reliability of the high-voltage system. The base glue is composed of methyl vinyl silicone rubber and carboxylated butyl rubber in a certain proportion, which combines the advantages of both, further enhances the oil resistance and mechanical properties, and makes the gasket have excellent sealing performance and stability in complex environments, meeting the use requirements of new energy vehicles. Overall, this scheme comprehensively improves the oil resistance, wear resistance, strength and tear resistance of the silicone rubber gasket, ensuring its reliable operation in the new energy vehicle high-voltage wire harness connector, and providing safety protection for the vehicle. DETAILED DESCRIPTION EMBODIMENT

[0030] EMBODIMENT 1 A silicone rubber gasket for a new energy vehicle high-voltage wire harness connector is prepared by the following method: S1, 1000 g of base glue, 200 g of filler, 60 g of chlorosulfonated polyethylene, 40 g of 2-acrylamido-2-methylpropanesulfonic acid, 50 g of silicon powder, 60 g of oil resistance agent, 40 g of molybdenum disulfide, 10 g of vulcanizing agent (sulfur), and 10 g of crosslinking agent (trimethylolpropane triacrylate) are subjected to internal mixing to obtain a mixed glue; S2, the mixed glue is rolled on an open mill and placed at room temperature for 3-5 h to obtain a sheet; S3, the sheet is subjected to three-stage vulcanization to obtain a new energy vehicle high-voltage wire harness connector silicone rubber gasket; The temperature of the first stage vulcanization is 180-200℃, and the time is 30-40min; The temperature of the second stage vulcanization is 150-160℃, and the time is 60-80min; The temperature of the third stage vulcanization is 200-210℃, and the time is 1-2h.

[0031] The base glue is composed of methyl vinyl silicone rubber and carboxylated butyl rubber in a weight ratio of 4:2.

[0032] The oil resistance agent is composed of calcium carbonate, active zinc oxide, and modified epoxy soybean oil in a weight ratio of 5:4:3.

[0033] The hydroxyl content of the carboxylated butyl rubber is 0.43 mol / Kg, the number average molecular weight is 1900, and the viscosity at 40℃ is 90 Pa.s.

[0034] The vinyl molar content of the methyl vinyl silicone rubber is 0.09%, and the weight average molecular weight is 550000.

[0035] The average molecular weight of chlorosulfonated polyethylene is 30000.

[0036] The silicon powder is spherical silicon powder, and the particle size of the spherical silicon powder is 0.1 microns, and the specific surface area is 50 m 2 / g.

[0037] The modified epoxy soybean oil is purchased from Jiangsu Litan Technology Co., Ltd., and the model is AESO.

[0038] Example 2-3 differs from Example 1 in that the types, amounts, and parameters of the raw materials for preparing the new energy vehicle high-voltage wire harness connector silicone rubber gasket are different, and the specific differences are shown in Table 1: Table 1 Types, amounts, and parameters of raw materials for preparing new energy vehicle high-voltage wire harness connector silicone rubber gasket in Examples 1-3 The carboxylated butyl rubber in Example 2 has a hydroxyl content of 0.51 mol / Kg, a number average molecular weight of 2400, and a viscosity of 45 Pa.s at 40℃; The methyl vinyl silicone rubber has a vinyl molar content of 36%, and a weight average molecular weight of 750000.

[0039] The carboxylated butyl rubber in Example 3 has a hydroxyl content of 0.65 mol / Kg, a number average molecular weight of 2800, and a viscosity of 7-90 Pa.s at 40℃; The methyl vinyl silicone rubber has a vinyl molar content of 0.55%, and a weight average molecular weight of 950000.

[0040] Example 4 A silicone rubber gasket for a high-voltage wiring harness connector of a new energy vehicle, different from Example 1 in that the base rubber is a methyl vinyl silicone rubber.

[0041] Example 5 A silicone rubber gasket for a high-voltage wiring harness connector of a new energy vehicle, different from Example 1 in that the filler is a hyperbranched polyester resin filler, prepared by the following method: 1) Mix 100 g of filler (silicon dioxide), 10 g of fluorine-containing silane coupling agent (tridecafluorooctyltriethoxysilane), and 50 g of acetone, and ultrasonicate for 30 min, and filter to obtain a silanized filler mixture; 2) Add 20 g of hyperbranched polyester resin and 0.5 g of p-toluenesulfonic acid to the silanized filler mixture, heat the mixture to 60℃ under a nitrogen atmosphere, and stir at a rotation speed of 300 r / min for 4 h of reaction, separate by filtration, rinse, and dry to obtain the hyperbranched polyester resin filler.

[0042] The hyperbranched polyester resin is a dendritic polyester polyol, and has a hydroxyl value of 540 mg KOH / g.

[0043] Example 6 A silicone rubber gasket for a high-voltage wiring harness connector of a new energy vehicle, different from Example 1 in that the filler is a hyperbranched polyester resin filler, prepared by the following method: 1) Mix 100 g of filler (silicon dioxide), 15 g of fluorine-containing silane coupling agent ((3,3,3-trifluoropropyl)methyldichlorosilane), and 70 g of acetone, and ultrasonicate for 40 min, and filter to obtain a silanized filler mixture; 2) Add 30 g of hyperbranched polyester resin and 1 g of p-toluenesulfonic acid to the silanized filler mixture, heat the mixture to 65℃ under a nitrogen atmosphere, and stir at a rotation speed of 300 r / min for 5 h of reaction, separate by filtration, rinse, and dry to obtain the hyperbranched polyester resin filler.

[0044] The hyperbranched polyester resin is a dendritic polyester polyol having a hydroxyl value of 590 mg KOH / g.

[0045] Example 7 A new energy automobile high-voltage wiring harness connector silica gel gasket, the difference between the embodiment and example 1 is that the particle size of the spherical silica powder is 20 microns.

[0046] Comparative example Comparative example 1 A new energy automobile high-voltage wiring harness connector silica gel gasket, the difference between the embodiment and example 1 is that the oil-resistant agent is calcium carbonate.

[0047] Comparative example 2 A new energy automobile high-voltage wiring harness connector silica gel gasket, the difference between the embodiment and example 1 is that the oil-resistant agent is composed of calcium carbonate and active zinc oxide in a weight ratio of 5:4.

[0048] Comparative example 3 A new energy automobile high-voltage wiring harness connector silica gel gasket, the difference between the embodiment and example 1 is that polyvinyl chloride is used instead of chlorosulfonated polyethylene.

[0049] The average molecular weight of the polyvinyl chloride is 30000.

[0050] Comparative example 4 A new energy automobile high-voltage wiring harness connector silica gel gasket, the difference between the embodiment and example 1 is that styrene sulfonic acid is used instead of 2-acrylamido-2-methylpropanesulfonic acid.

[0051] Comparative example 5 A new energy automobile high-voltage wiring harness connector silica gel gasket, the difference between the embodiment and example 1 is that zinc stearate is used instead of molybdenum disulfide.

[0052] Detection method / test method Tensile strength: refer to GBT528-2009 "Measurement of Tensile Stress-Strain Properties of Vulcanized or Thermoplastic Rubber", prepare the required test samples in the molding step, and perform tensile strength test.

[0053] Abrasion resistance: the new energy automobile high-voltage wiring harness connector silica gel gaskets prepared in examples 1-7 and comparative examples 1-5 are cut into samples of the same size and shape, then fixed on the test bench, and selected sandpaper with a particle size of 180 mesh is used to polish the surface of the gasket with a pressure of 500g, 100 times each time, and a total of 3 times. After each polishing, the gasket is weighed and the weight change is recorded.

[0054] ​Oil resistance: according to GB / T 1690-2010 standard, the oil is liquid B (30% toluene, 70% isooctane), soak for 168h at 23℃, test the mass change rate and tensile strength. The experimental data are shown in Table 2: Table 2 Experimental data of examples 1-7 and comparative examples 1-5 From the experimental data of examples 1 and comparative examples 1-2, it can be seen that by preparing the oil resistance agent with calcium carbonate, active zinc oxide and modified epoxy soybean oil in a specific ratio, the oil resistance of the silicone gasket of the new energy vehicle high-voltage wire harness connector can be greatly improved, while the tensile strength and wear resistance of the silicone gasket of the new energy vehicle high-voltage wire harness connector are good.

[0055] From the experimental data of examples 1 and comparative examples 3-5, it can be seen that by adding an appropriate amount of chlorosulfonated polyethylene, 2-acrylamide-2-methylpropane sulfonic acid and molybdenum disulfide with other raw materials, the oil resistance, tensile strength and wear resistance of the silicone gasket of the new energy vehicle high-voltage wire harness connector can be improved.

[0056] From the experimental data of examples 1 and 4, it can be seen that by using methyl vinyl silicone rubber and carboxylated butyl rubber in a specific ratio, the oil resistance, tensile strength and wear resistance of the silicone gasket of the new energy vehicle high-voltage wire harness connector can be improved.

[0057] From the experimental data of examples 1 and examples 5-6, it can be seen that the hyperbranched polyester resin filler prepared by the present application can improve the oil resistance, tensile strength and wear resistance of the silicone gasket of the new energy vehicle high-voltage wire harness connector.

[0058] From the experimental data of examples 1 and example 7, it can be seen that by using spherical silicon powder with other raw materials, the oil resistance, tensile strength and wear resistance of the silicone gasket of the new energy vehicle high-voltage wire harness connector can be improved.

[0059] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A silicone gasket for a high-voltage wiring harness connector in new energy vehicles, characterized in that, It is prepared from the following raw materials in parts by weight: 100 parts base adhesive 20-30 parts of filler 6-10 parts of chlorosulfonated polyethylene 4-8 parts of acrylamide-2-methylpropanesulfonic acid 5-10 parts of silicon micro powder 6-12 parts of oil-resistant agent 4-6 parts of molybdenum disulfide 1-2 parts of vulcanizing agent 1-2 parts of crosslinking agent The oil-resistant agent is composed of calcium carbonate, active zinc oxide, and modified epoxidized soybean oil in a weight ratio of (5-10):(4-6):3; The filler includes at least one of silica, silicon dioxide, quartz, talc, silicon nitride, silicon carbide, and ceramic powder.

2. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 1, characterized in that: The base rubber is composed of methyl vinyl silicone rubber and carboxylated butyl rubber in a weight ratio of (4-7):

2.

3. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 2, characterized in that: The carboxylated butyl rubber has a hydroxyl content of 0.43-0.65 mol / Kg, a number-average molecular weight of 1900-2800, and a viscosity of 7-90 Pa·s at 40℃.

4. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 1, characterized in that: The methyl vinyl silicone rubber has a vinyl molar content of 0.09-0.55% and a weight-average molecular weight of 550,000-950,000.

5. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 1, characterized in that: The average molecular weight of the chlorosulfonated polyethylene is 30,000-120,000.

6. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 1, characterized in that: The silicon micropowder is spherical, with a particle size of 0.1-10 micrometers and a specific surface area of ​​50-100 m². 2 / g .

7. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 1, characterized in that, The filler is a hyperbranched polyester resin filler, which is pretreated by the following method: 1) Mix the filler, fluorinated silane coupling agent and acetone, sonicate for 30-40 minutes, filter, and obtain a silanized filler mixture; 2) Add hyperbranched polyester resin and p-toluenesulfonic acid to the silanized filler mixture. Under a nitrogen atmosphere, heat the mixture to 60-65℃ and stir at 300r / min for 4-5h. Filter, separate, wash, and dry to obtain hyperbranched polyester resin filler.

8. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 7, characterized in that, The weight parts of the raw materials used to prepare the hyperbranched polyester resin filler are as follows: 100 parts of filler 10-15 parts of fluorinated silane coupling agent 50-70 parts acetone 20-30 parts of hyperbranched polyester resin 0.5-1 part of p-toluenesulfonic acid.

9. The silicone gasket for a high-voltage wiring harness connector for new energy vehicles according to claim 7, characterized in that: The hydroxyl value of the hyperbranched polyester resin is 540-590 mg KOH / g.

10. A method for preparing a silicone gasket for a high-voltage wiring harness connector for new energy vehicles as described in any one of claims 1-9, characterized in that, The preparation steps include the following: S1. The base rubber, filler, chlorosulfonated polyethylene, 2-acrylamido-2-methylpropanesulfonic acid, silica powder, oil-resistant agent, molybdenum disulfide, vulcanizing agent and crosslinking agent are mixed to obtain a mixed rubber. S2. The mixed rubber is rolled on a two-roll mill and left at room temperature for 3-5 hours to obtain a sheet. S3. The sheet is vulcanized in three stages to obtain the silicone gasket for the high-voltage wiring harness connector of new energy vehicles. One stage of vulcanization involves a temperature of 180-200℃ and a time of 30-40 minutes. The temperature for the second-stage vulcanization is 150-160℃, and the time is 60-80 minutes. The temperature for the three-stage vulcanization process is 200-210℃, and the time is 1-2 hours.

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