文章摘要
Properties of Modified Rubber Powder by Twin-screw Extrusion/NR Blends
Received:March 01, 2020  Revised:March 01, 2020
DOI：10.12136/j.issn.1000-890X.2020.11.0839
Key Words: two-screw extrusion；modification；rubber powder；NR；blend；crosslinking network；extrusion speed
Author NameAffiliationE-mail
ZENG Dong Yangzhou University liujunliang@yzu.edu.cn 
XU Xiangrong Yangzhou University  
WU Junqing Yangzhou University  
XU Jian Yangzhou University  
XUE Yan Yangzhou University  
LIU Junliang* Yangzhou University liujunliang@yzu.edu.cn 
ZHANG Ming* Yangzhou University lxyzhangm@yzu.edu.cn 
CHEN Chuanzhong China（Yangzhou） Material Handling Tech-Engineering Ltd  
TIAN Yao China（Yangzhou） Material Handling Tech-Engineering Ltd  
CHEN Xuan China（Yangzhou） Material Handling Tech-Engineering Ltd  
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Abstract:
      Extruding-modified waste rubber powders（WRPs） was prepared by using two-screw extruder，and the influences of extrusion speed on the properties of WRPs/natural rubber（NR） blends were investigated. The results showed that，with the strong shear force by two-screw extruder，the crosslinking network of WRPs was wrecked. As the extrusion speed increased，the crosslinking densities of WRPs（vulcanizate） first dramatically decreased and then gradually tended to a stable value. The typical “sea-island” structure formed in the blend of extruding-modified WRPs and NR gradually disappeared according to the increasing decomposition of the WRPs’ network. A co-crosslinking network structure was formed between extruding-modified WRPs and NR.When the damage of crosslinking network of WRPs was appropriate，the crosslinking network between extruding-modified WRPs and NR was easy to form during vulcanization，and excessive degradation of WRPs was avoided，so that the WRPs/NR blends could obtain larger tensile strength and elongation at break.
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