| Scorch safety of CR during mixing process |
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| DOI： |
| Key Words: CR；scorch safety；torque rheometer；Mooney scorch safety |
| Author Name | Affiliation | | ZHANG Anqiang | South China University of Technology | | WANG Lianshi | South China University of Technology | | ZHOU Yiyu | South China University of Technology |
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| Abstract: |
| The scorch time ts and dynamic curing index Δt during mixing in a wider range of temperatures (110～160 ℃) and rotor speeds (40～100 r·min-1) on Brabender torque rheometer and the Mooney scorch safety (t5 and Δt30) were measured by using CR mix prepared on an open mill.It was found that the scorch safety of CR mix during the real mixing process could not be well reflected by Mooney scorch safety.A relationship curve and a relationship model for the scorch safety of CR during mixing to the mixing temperature and the rotor speed were fitted based on the experimental data.The affecting tendency of the mixing temperature and the rotor speed on the scorch safety of CR mix was explained in view of mechanical-chemical reaction in rubber and accordingly the model was verified.The results of the square-error and regression analyses showed that the model could be used to characterize the dependence of the scorch safety for CR during mixing on the mixing temperature and the rotor speed correctly；and the scorch safety of CR during mixing depended on the rotor speed more strongly than on the mixing temperature，and there was an interaction between them. |
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