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Ethylene propylene diene monomer rubber sealing material with low compression permanent deformation, and preparation method thereof

A technology of permanent deformation of EPDM rubber, which is applied in the field of EPDM rubber, and can solve the problem of large influence range of mechanical properties of EPDM rubber, increase of elastic modulus, and decrease of deformation performance of EPDM rubber, etc. problems, achieve good flexibility and deformability, reduce compression set, and good elastic sealing performance

Inactive Publication Date: 2019-12-31
宁波新安东密封保温系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has a wide range of influence on the mechanical properties of EPDM rubber. The hardness of EPDM rubber increases, and the elastic modulus increases, and the deformation performance of EPDM rubber decreases greatly. This is not the case for sealing materials. expected result

Method used

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  • Ethylene propylene diene monomer rubber sealing material with low compression permanent deformation, and preparation method thereof
  • Ethylene propylene diene monomer rubber sealing material with low compression permanent deformation, and preparation method thereof
  • Ethylene propylene diene monomer rubber sealing material with low compression permanent deformation, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0052] A kind of EPDM rubber sealing material with low compression set, its raw material includes the following composition and its mass parts,

[0053] EPDM rubber 100 parts,

[0054] Filling 15-30 parts,

[0055] Release agent 2 to 4 parts,

[0056] 2 to 4 parts of vulcanizing agent,

[0057] Vulcanization aid 0.3~0.6 parts,

[0058] 18-25 parts of carbon black,

[0059] Sulfur S-80 0.1~0.4 parts,

[0060] 2-4 parts of silane coupling agent.

[0061] 70-80 parts of EPDM rubber is maleic anhydride grafted EPDM rubber, and the rest is oil-extended EPDM rubber.

[0062] The filler includes one or more of freeze-thaw powder, calcined powder, and white carbon black, and the freeze-thaw powder accounts for more than 33wt% of the filler, the calcined powder accounts for less than 45.5wt% of the filler, and the white carbon black is The proportion of the filler is less than 40wt%.

[0063] The particle size of the freeze-thaw powder is 400-600nm. The preparation method of th...

Embodiment 7

[0101] An EPDM sealing material with low compression set, based on Example 4, the difference is that the catalyst used is zinc sulfide powder.

Embodiment 8

[0103] An EPDM sealing material with low compression set, based on Example 4, the difference is that the catalyst used is zinc sulfide whisker.

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Abstract

The invention relates to ethylene propylene diene monomer rubber, and discloses an ethylene propylene diene monomer rubber sealing material with low compression permanent deformation, and a preparation method thereof. The ethylene propylene diene monomer rubber sealing material is prepared by mixing and refining, by mass, 100 parts of ethylene propylene diene monomer rubber containing 70-80 partsof maleic anhydride grafted ethylene propylene diene monomer rubber; 15-30 parts of filler including more than 33wt% of a freeze thaw powder; 2-4 parts of a release agent; 2-4 parts of a vulcanizing agent; 0.3 to 0.6 part of a vulcanizing aid; 18 to 25 parts of carbon black; and 0.1 to 0.4 part of sulphur S-80. The particle size of the freeze-thaw powder is 400-600 nm; a preparation method of thefreeze-thawed powder comprises the following steps: mixing uncalcined shell powder with a leachate at -15 to-14 DEG C according to a mass ratio of (0.2-0.4): 1, soaking the uncalcined shell powder inthe leachate for 40-50 minutes, and drying to obtain the freeze-thawed powder, wherein the leachate is a urea and sodium hydroxide aqueous solution, the urea concentration is 4 wt%, and the sodium hydroxide concentration is 8 wt%. According to the ethylene propylene diene monomer sealing material, the compression permanent deformation of the ethylene propylene diene monomer sealing material is reduced while the elasticity requirement of the original design is met.

Description

technical field [0001] The invention relates to EPDM rubber, in particular to EPDM sealing material with low compression permanent deformation and a preparation method thereof. Background technique [0002] EPDM is a kind of ethylene-propylene rubber, which is a copolymer of ethylene, propylene and a small amount of non-conjugated dienes, expressed in EPDM, because its main chain is composed of chemically stable saturated hydrocarbons, only on the side The chain contains unsaturated double bonds, so it has excellent aging resistance such as ozone resistance, heat resistance, and weather resistance. It can be widely used in automotive parts, waterproof materials for construction, wire and cable sheaths, heat-resistant hoses, tapes, automotive seals, etc. field. [0003] However, the main chain composed of fully saturated hydrocarbons gives EPDM rubber high compatibility, heat resistance and weather resistance, and at the same time, the bonding force between its internal mole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/04C08L23/16C08L83/04C08K7/24C08K9/04C08K3/26C08K3/04C08K3/06C08K3/36C08K3/22C08K7/08
CPCC08K2003/2296C08L51/04C08L23/16C08L83/04C08K7/24C08K9/04C08K3/26C08K3/04C08K3/06C08K3/36C08K3/22C08K7/08
Inventor 陈仕政盛建壮林兆卫张巧彦朱留冬钟香梅
Owner 宁波新安东密封保温系统有限公司
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