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A kind of micro-crosslinked thermoplastic elastomer sealing material and preparation method thereof

A thermoplastic elastomer and sealing material technology, applied in the field of micro-crosslinked thermoplastic elastomer sealing material and its preparation, can solve the problems of material contamination, low oil film strength, system failure, etc.

Active Publication Date: 2018-12-28
新疆天利高新石化股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The penetration of white oil will lead to the following negative factors: (1) white oil accumulates on the surface of the sealing material to form an oil film, and the strength of the oil film is low, which will reduce the sealing performance of the material; (2) the white oil migrates to the surface, making The uniformity of the material is destroyed, the local white oil content is high, and the local SBS content is high, which leads to uneven hardness and performance of the material, which will reduce the sealing performance of the material; (3) The seeping oil will make contact with the sealing material Some of the materials are contaminated and corroded, which not only reduces the sealing performance, but also makes the whole system fail in other aspects

Method used

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  • A kind of micro-crosslinked thermoplastic elastomer sealing material and preparation method thereof
  • A kind of micro-crosslinked thermoplastic elastomer sealing material and preparation method thereof
  • A kind of micro-crosslinked thermoplastic elastomer sealing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Oil-extending and plasticizing of SBS

[0044] Add liquid softening system (polyisobutylene: INEOS H-100; vinyl polysiloxane: Xinan Chemical XHG-206-60000), SBS (Kraton KX222: 18% styrene content, star structure) into the internal mixer ) and other additives, the temperature of the internal mixer is set at 200°C, and the internal mixing time is not less than 3 hours to complete the plasticization of SBS and the mixing with the softener;

[0045] Other additives include antioxidant: 1010 and lubricant: silicone.

[0046] (2) Micro-crosslinking

[0047] Slowly add the cross-linking system to the system in the internal mixer, and the adding time is not less than 1 hr to complete the micro-cross-linking.

[0048] The crosslinking system is composed of di-tert-butyl peroxide and triallyl isocyanurate in a mass ratio of 1:1.

[0049] (3) Application testing of materials

[0050] The required sealing parts are prepared by injection molding machine, and relevant perform...

Embodiment 2

[0059] The implementation process is the same as in Example 1, except that the ratio of polyisobutylene and vinyl polysiloxane is adjusted, and the ratio of vinyl polysiloxane is increased. The proportions of other materials and the performance test results of the obtained materials are shown in Table 1.

Embodiment 3

[0061] The implementation process is the same as in Example 1, except that the ratio of polyisobutylene and vinylpolysiloxane is adjusted, and the ratio of polyisobutylene is increased. The proportions of other materials and the performance test results of the obtained materials are shown in Table 1.

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Abstract

The invention discloses a mico-crosslinking thermoplastic elastomer sealing material. The material is prepared by adopting SBS as a base material, and adopting a liquid softening system composed of a softener with reactive groups and a softener with non-reactive groups, wherein the liquid softening system is prepared from, by weight, 66%-86% of the softener with reactive groups and 14%-34% of the softener with non-reactive groups, the softener with reactive groups is vinyl polysiloxane, and the softener with non-reactive groups is polyisobutene. Aiming at the problem that unltrasoft sealing material is prone to oil leakage under the high oil-filled condition, according to the mico-crosslinking thermoplastic elastomer sealing material, an elastomer sealing material based on SBS is provided, the specifically composed liquid softening system is adopted, and the prepared sealing material has the advantages of being ultralow in hardness, free of oil leakage and high in airtightness.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a micro-crosslinked thermoplastic elastomer sealing material and a preparation method thereof. Background technique [0002] SBS is a styrene-butadiene-styrene block copolymer with high strength, softness, small permanent deformation and good elasticity. It can be in contact with water, weak acid and alkali, etc. It has excellent tensile strength and large surface friction coefficient. , good low temperature performance, excellent electrical performance, good processing performance, etc., can be directly applied, and has been used in the fields of shoe sole materials, asphalt modification, resin modifiers and sealing materials. [0003] As a sealing material, it is required that the material has softness, good elasticity and good elasticity retention rate under high and low temperature environment. Softness allows the sealing material to block leaks under a small press...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/20C08L83/07C08L53/02C08K5/14C08K5/3492
CPCC08L23/22C08L2201/08C08L2205/035C08L2207/04C08L2312/00C08L83/04C08L53/02C08K5/14C08K5/34924
Inventor 雷华徐海银宋清山陈科吴新祥赵伟何文宝薛巍于文涛
Owner 新疆天利高新石化股份有限公司