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Low-temperature-resistant control valve material applied to electronic brake system and preparation method of low-temperature-resistant control valve material

A technology of electronic braking and low temperature resistance, applied in the field of composite materials, can solve the problems of unsuitable production of control valve materials, inability to respond quickly to dimensional changes, and decrease in elasticity of vulcanized rubber materials, so as to avoid excessive increase in storage modulus and storage. The modulus is not easy to increase, and the effect of slowing down the crystallization rate

Inactive Publication Date: 2019-10-29
宁国市普萨斯密封技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The glass transition temperature of EPDM rubber is generally around -60°C, which can meet the requirements of ordinary control valves. However, under low temperature conditions, ordinary EPDM rubber is prone to crystallization, so that the molecular chains are highly oriented. As a result, the elasticity of the vulcanized rubber material is significantly reduced, the storage modulus is greatly increased, the compression recovery becomes poor, and the dimensional change caused by the external force cannot be quickly responded, resulting in the pressure release of the assembly.
However, the price of low-hardness silica gel is generally 300 yuan / kg, and its cost is too high, and its production operability is not good, so it is not suitable for the production of control valve materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A low-temperature-resistant control valve material applied to an electronic brake system, comprising the following raw materials in parts by mass:

[0023] EPDM rubber 60, liquid rubber 20, carbon black 20, additive 3, plasticizer 6, vulcanizing agent 6. The EPDM rubber is a controllable long-chain branched EPDM rubber, the ethylene content is 45.9%, the Brookfield viscosity of the liquid rubber is 990, and the glass transition temperature is -90°C.

Embodiment 2

[0025] A low-temperature-resistant control valve material applied to an electronic brake system, comprising the following raw materials in parts by mass:

[0026] EPDM rubber 60, liquid rubber 40, carbon black 40, additive 4, epoxy soybean oil 6, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane 8.

[0027] Among them, the EPDM rubber is a controllable long-chain branched EPDM rubber with an ethylene content of 45.9%; the molecular weight of the liquid rubber is 990, and the glass transition temperature is -90°C; the specific surface area of ​​the carbon black is 31m 2 / g; additives are polyethylene wax and N-phenyl-N'-cyclohexyl-p-phenylenediamine with a mass ratio of 2:1.

[0028] First weigh various materials, add EPDM rubber, liquid rubber and additives into the internal mixer and mix for 20 seconds, then add carbon black and epoxy soybean oil, raise the temperature to 135 °C and then degrease, the obtained A section of rubber is cooled, and then the cooled section of rubber a...

Embodiment 3

[0030] A low-temperature-resistant control valve material applied to an electronic brake system, comprising the following raw materials in parts by mass:

[0031] EPDM rubber 70, liquid rubber 30, carbon black 30, additive 4, dibutyl phthalate 7, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexyl Alkane 7.

[0032] Among them, the EPDM rubber is a controllable long-chain branched EPDM rubber with an ethylene content of 48%; the molecular weight of the liquid rubber is 1000, and the glass transition temperature is -88°C; the specific surface area of ​​the carbon black is 33m 2 / g; additives are chlorinated paraffin and N-phenyl-β-naphthylamine with a mass ratio of 2.5:1.

[0033] First weigh various materials, add EPDM rubber, liquid rubber and additives into the internal mixer and mix for 25 seconds, then add carbon black and dibutyl phthalate, heat up to 140°C and then discharge the glue. Cool the obtained section of rubber, and then add the cooled section of rubber and 2,5-dimeth...

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Abstract

The invention discloses a low-temperature-resistant control valve material applied to an electronic brake system and a preparation method of the low-temperature-resistant control valve material. The control valve material is prepared from the following raw materials in parts by mass: 60-80 parts of epdm rubber, 20-40 parts of liquid rubber, 20-40 parts of a filler, 3-5 parts of an assistant, 6-8 parts of a plasticizer and 6-8 parts of a vulcanizing agent, wherein the epdm rubber is controlled long-chain branching epdm rubber, the content of ethylene is 45.9-50.1%, the Brookfield viscosity of the liquid rubber is 900-1010, and the glass transition temperature is -90 to -85 DEG C. According to the low-temperature-resistant control valve material applied to the electronic brake system and thepreparation method of the low-temperature-resistant control valve material, the prepared control valve material has excellent low-temperature performance, the requirements of small storage modulus ofthe control valve material under the low temperature condition are met, and the low-temperature-resistant control valve material is suitable for the manufacturing of high-end brand automobiles.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a low-temperature-resistant control valve material used in an electronic braking system and a preparation method thereof. Background technique [0002] Automobile braking system refers to a series of special devices that exert a certain force on certain parts of the automobile (mainly the wheels) to perform a certain degree of mandatory braking. At present, EPDM rubber is mainly used as the material of the brake system control valve in the market. The glass transition temperature of EPDM rubber is generally around -60°C, which can meet the requirements of ordinary control valves. However, under low temperature conditions, ordinary EPDM rubber is prone to crystallization, so that the molecular chains are highly oriented. As a result, the elasticity of the vulcanized rubber material is significantly reduced, the storage modulus is greatly increased, the compression rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L21/00C08L23/06C08L91/00C08L91/06C08K3/04C08K5/14C08K5/18C08K5/55C08K5/523
CPCC08L23/16C08L2205/03C08L2205/035C08L2312/00C08L21/00C08L23/06C08L91/00C08L91/06C08K3/04C08K5/14C08K5/18C08K5/55C08K5/523
Inventor 黄宏富方荣平王民飞
Owner 宁国市普萨斯密封技术有限公司