| Influence of Mill Runs during Plasticizing on Plasticity and Physical Properties of NR Produced in China and Thailand |
| Received:March 30, 2017 Revised:March 30, 2017 |
| DOI：10.12136/j.issn.1000-890X.2019.04.0297 |
| Key Words: NR；number of milling cycles during plasticizing；Mooney viscosity；plasticity；physical property；dynamic property |
| Author Name | Affiliation | E-mail | | LIN Guangyi | Qingdao University of Science and Technology | gylin666@163.com | | KONG Lingwei* | Qingdao University of Science and Technology | 1129088361@qq.com | | WANG Quanjie | Qingdao University of Science and Technology | | | WANG Xiang | Qingdao University of Science and Technology | | | JING Yuan | Qingdao University of Science and Technology | | | ZHU Lianchao | Shanghai Sri Trang Trading Co.，Ltd | |
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| Abstract: |
| In this study，natural rubber（NR） was milled by using a two-roll mill，and the influence of the number of milling cycles during plasticizing on the plasticity and physical properties of NR produced in China and Thailand（SCR20 and STR20，respectively） was investigated.The results showed that，with the milling number increasing，the Mooney viscosity，plasticity and shear storage modulus（G′） of NR raw rubber decreased，and the loss factor（tanδ）increased.When the milling number was the same，the G′ of SCR20 raw rubber was larger than that of STR20 raw rubber，and tanδ was smaller than that of STR20 raw rubber.With the mill number increasing，the discharge temperature of the mix was reduced，the Payne effect was weakened，and the vulcanization rate increased.It was found that STR20 possessed the highest tensile strength when the milling number was 20，while SCR20 possessed the highest tensile strength when the milling number was 30.The results of dynamic mechanical analysis showed that with the milling number increasing，the wet skid resistance of the vulcanizate was improved，the rolling resistance increased，and the vulcanizate possessed the best dynamic mechanical properties when the milling number was 30 for SCR and 20 for STR20. |
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