文章摘要
Effect of Crosslinking Structure on Efficient Thermal-Oxidative Regeneration of NR Vulcanizate
Received:March 08, 2024  Revised:March 08, 2024
DOI：10.12136/j.issn.1000-890X.2026.03.0163
Key Words: NR；crosslinking structure；vulcanization system；thermal-oxidative regeneration；reclaimed rubber
Author NameAffiliationE-mail
REN　Teng School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University sjtu.rt19960906@sjtu.edu.cn 
PENG Zonglin School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University  
YUE Xinyan School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University  
HE Xiaorong School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University  
WANG Shifeng* School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University shfwang@sjtu.edu.cn 
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Abstract:
      The effect of crosslinking structure on thermal-oxidative regeneration of natural rubber （NR） vulcanizates was studied，and the regeneration effect of NR vulcanizates with different crosslinking structures was characterized by sol content and sol number average molecular weight（Mn） of reclaimed rubber，and the gas compositions generated during the regeneration process was also analyzed.The results showed that after 9 min of thermal-oxidative regeneration at 210 ℃，the sol contents of NR reclaimed rubber from conventional vulcanization systems，semi effective vulcanization systems and effective vulcanization systems NR vulcanizates were 100%，69.7% and 30.5%，respectively.The type of crosslinking bond was the main factor affecting the thermal-oxidative regeneration of NR vulcanizates，and vulcanizates with rich multiple sulfur bonds were more easily degraded and regenerated.The higher the crosslinking density of NR vulcanizate was，the longer the thermal-oxidative regeneration time was，and the smaller the sol Mn of NR regenerated rubber was.The conventional vulcanization system NR vulcanizate with low crosslinking density and rich multiple sulfur bonds released more gas during thermal-oxidative regeneration，and the degradation degree was greater.
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