| Mechanism of Influence of Microparticles on Fatigue Crack of Rubber Materials |
| Received:March 24, 2021 Revised:March 24, 2021 |
| DOI：10.12136/j.issn.1000-890X.2021.12.0890 |
| Key Words: fatigue crack；microparticle；zinc oxide；NR；fatigue crack；fatigue resistance；micro defects |
| Author Name | Affiliation | E-mail | | WANG Jing* | Tsinghua University | wangjing9917@126.com | | HOU Dandan | Zhongce Rubber Group Co.，Ltd | | | ZHANG Chunsheng | Zhongce Rubber Group Co.，Ltd | | | TONG Xiaoqian | Zhongce Rubber Group Co.，Ltd | | | WEI Yintao | Tsinghua University | | | KANG Zhenran | E-Rubber Technology（Beijing） Co.，Ltd | | | WANG Hao | E-Rubber Technology（Beijing） Co.，Ltd | |
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| Abstract: |
| Abstract：The influence of ordinary zinc oxide and nano-zinc oxide on the fatigue resistance of natural
rubber（NR） was studied. The results showed that，ordinary zinc oxide had a larger particle size and usually
did not agglomerate，but the large particles would cause defects in the vulcanizates. Nano-zinc oxide had a
smaller particle size，larger specific surface area and better activity，but it was easy to agglomerate and form
microscopic cavities in the vulcanizate if its dosage was large. Both ordinary zinc oxide and nano-zinc oxide
could cause cracks in the vulcanized rubber under the action of alternating stress. It was found that when
nano-zinc oxide was used to replace the ordinary zinc oxide in the compounds with a reduced amount by
20%，it was uniformly dispersed in the vulcanizates，did not form any microscopic cavity and provided a good
activation effect. As a result，the physical properties of the vulcanizates were good and the fatigue resistance
was excellent. |
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