| Effect of Compatibility between Carbon Black and Rubber on Scorch Phenomenon of EPDM Compound Caused by Carbon Blackn Black and Rubber |
| Received:April 27, 2021 Revised:May 16, 2021 |
| DOI：10.12136/j.issn.1000-890X.2022.05.0337 |
| Key Words: EPDM；carbon black；scorch；surface polarity；compatibility；activation energy；Payne effect |
| Author Name | Affiliation | E-mail | | WU Xiaolin | Shandong Link Advanced Materials Co. ，Ltd | 15762612825@163.com | | ZHAO Guogang | Shandong Link Advanced Materials Co. ，Ltd | | | JIANG Baohuan | Shandong Link Advanced Materials Co. ，Ltd | | | ZHANG Zhongshan* | Shandong Link Advanced Materials Co. ，Ltd | zhang3210729@163.com |
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| Abstract: |
| The scorch of ethylene-propylene-diene rubber（EPDM）compound caused by a large loading of carbon black（carbon black scorch for short）affected the mixing，stock storage and downstream processing of the compound. In this work，the regular and post-treated carbon black N550 were adopted to investigate the effect of compatibility between carbon black and rubber on carbon black scorch of EPDM compound. The results showed that，the post-treatment of carbon black N550 in the production process
could decompose some oxygen containing groups on the carbon black surface，thereby reducing its oxygen content and surface polarity，and increasing the pH value. Compared with the regular carbon black N550，the post-treated carbon black N550 had improved compatibility and strengthened interaction with EPDM.The initial Mooney viscosity of the compound with the post-treated carbon black N550 was reduced by about 5%，the activation energy of carbon black scorch was increased by more than 30%，the carbon black scorch time t5 was prolonged by more than 30%，and the Payne effect was reduced by 10%，which could reduce the hysteresis loss and heat built up of the vulcanizate. |
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