文章摘要
Effect of BIBP Reaction Byproducts on Insulation Properties of Vulcanizate for CM/EPDM Cable Insulation Layer
Received:September 30, 2022  Revised:September 30, 2022
DOI：10.12136/j.issn.1000-890X.2023.11.0868
Key Words: CM；EPDM；peroxide vulcanizing agent；cable insulation layer；volume resistivity
Author NameAffiliationE-mail
CHU Dingyi South China University of Technology 770543850@qq.com 
DING Jianping South China University of Technology  
XIONG Kang Guangzhou Beiyu Technology Application Co.，Ltd  
FANG Yuesheng South China University of Technology  
LIU Yunchun South China University of Technology  
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Abstract:
      The effect of peroxide vulcanizing agent BIBP reaction byproducts on insulation properties of the vulcanizate for the chlorinated polyethylene rubber（CM）/ethylene propylene diene rubber（EPDM） cable insulation layer was studied，and a new auxiliary activator A was introduced to replace part of BIBP to improve the volume resistivity of the vulcanizate without affecting other properties of the compound.The results showed that base on this test formula，when 0.7 phr BIBP was reduced and 0.45 phr activator A was added，the vulcanizing characteristics of CM/EPDM compound and physical properties of the vulcanizate were not reduced，the reduction rate of elongation at break of CM/EPDM vulcanizate after 100 ℃×168 h aging increased，but which still met national and industry standards.The volume resistivity of CM/EPDM vulcanizate before immersion in water increased from 1.3×1013 Ω·cm to 5.0×1014 Ω·cm，and the volume resistivity after 28 d of immersion increased from 3.6×1010 Ω·cm to 5.4×1012 Ω·cm，the insulation property was improved significantly.According to further research，it was found that the change in the amount of BIBP reaction byproducts during the vulcanization process was the main reason for the changes in the properties of CM/EPDM compound，and the microscopic morphology of the vulcanizate section after immersion observed by scanning electron microscopy also confirmed this conclusion.
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