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
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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、可塑度和剪切储能模量(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。
In this study,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 and20 for STR20.
In this study,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 and20 for STR20.
引文
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[2]郑骏驰,叶欣,韩冬礼,等.乳液共混法制备天然橡胶复合材料研究进展[J].橡胶工业,2015,62(6):377-382.
[3]许逵,陈静,潘荣楷,等.炭黑/煤矸石/碳纳米管复合填料对天然橡胶性能的影响[J].橡胶工业,2016,63(3):155-159.
[4]刘玉科.橡胶加工塑炼机理及实验研究[J].工业工程与技术,2013,13(1):33.
[5]惠炳国,王振太,刘瑞强,等.塑炼对NR胶料性能的影响[J].橡胶科技市场,2009,7(15):15-17.
[6]陈德,刘元.使用橡胶加工分析仪表征天然橡胶Mr的变化趋势[J].化学推进剂与高分子材料,2015,13(3):81-83.
[7]来庆存.NR/炭黑复合材料炭黑分散性与动态性能的研究[D].青岛:青岛科技大学,2015.
[8]Chandy Kim,Jerome Sainte Beuve,Stephane Guilbert,et al.Study of Chain Branching in Natural Rubber Using Size-Exclusion Chromato-Gragh Coupled with a Multi-Angle Light Scattering Detector(SEC-MALS)[J].European Polymer Journal,2009,45(8):2249-2259.
[9]Fu Wen,Wang Li.Variation of Payne Effect in Natural Rubber Reinforced by Graft-modified Carbon Black[J].Journal of Macromolecular Science,Part B.Physics,2017,56(1):53-63.
[10]刘涛,陈亚薇,刘东,等.填充橡胶的Payne效应[J].特种橡胶制品,2015,36(6):76-81.
[11]吴其晔,张萍,杨文君,等.高分子物理学[M].北京:高等教育出版社,2011.
[12]王博,邹涛,苍飞飞,等.用动态力学热分析仪研究胶料的动态力学性能[J].橡胶科技市场,2017,15(1):12-16.
[13]盛柏松.橡胶动态力学性能分析的影响因素[J].橡胶科技市场,2017,15(6):22-24.
[14]贺建芸,胡永康,付新华,等.轮胎胶料的动态力学性能研究[J].橡胶工业,2017,64(1):14-18.
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