| 塑炼过辊次数对国产和泰国产天然橡胶塑性和物理性能的影响 |
| Influence of Mill Runs during Plasticizing on Plasticity and Physical Properties of NR Produced in China and Thailand |
| 投稿时间：2017-03-30 修订日期：2017-03-30 |
| DOI：10.12136/j.issn.1000-890X.2019.04.0297 |
| 中文关键词: 天然橡胶 塑炼 过辊次数 门尼粘度 塑性 物理性能 动态性能 |
| 英文关键词: NR number of milling cycles during plasticizing Mooney viscosity plasticity physical property dynamic property |
| 基金项目: |
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| 中文摘要: |
| 采用两辊开炼机塑炼天然橡胶（NR），研究塑炼过辊次数对国产和泰国产NR（SCR20和STR20）塑性和物理性能的影响。结果表明：随着塑炼过辊次数的增加，NR生胶的门尼粘度、塑性值和剪切储能模量（G′）减小，损耗因子（tanδ）增大，塑炼过辊次数相同时，SCR20生胶的G′大于STR20生胶，tanδ小于STR20生胶；随着NR塑炼过辊次数的增加，混炼胶的排胶温度降低，Payne效应减弱，硫化速率加大，STR20塑炼过辊20次时硫化胶的拉伸强度最大，SCR20塑炼过辊30次时硫化胶的拉伸强度达到最大。动态力学分析结果表明，随着NR塑炼过辊次数的增加，硫化胶的抗湿滑性能提高，滚动阻力增大，SCR20塑炼过辊30次、STR20塑炼过辊20次时，硫化胶的动态力学性能最佳。 |
| 英文摘要: |
| 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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