硅烷偶联剂TPTS和表面活性剂PEG-400协同改性白炭黑/天然橡胶复合材料的制备及性能研究

Preparation and Properties of Silica/Natural Rubber Composites Modified by Silane Coupling Agent TPTS and Surfactant PEG-400

使用酰基硫代烷基三烷氧基硅烷(TPTS)和表面活性剂PEG-400(简称PEG-400)协同改性白炭黑,通过乳液复合法制备白炭黑/天然橡胶(NR)复合材料,研究TPTS与PEG-400的配比对复合材料性能的影响。结果表明:与未改性白炭黑复合材料相比,改性白炭黑复合材料硫化速率提高,白炭黑自聚集现象减弱,加工性能改善,物理性能提高;当TPTS/PEG-400质量比为6/2时,改性白炭黑对NR的补强效果最为理想,复合材料的拉伸强度提高33.6%,300%定伸应力提高47.4%;在TPTS与PEG-400总用量恒定的情况下,随着PEG-400用量的增大,复合材料的滚动阻力呈降低趋势,但抗湿滑性能也会有所下降,通过TPTS和PEF-400的协同改性可以使复合材料在抗湿滑性能和滚动阻力间取得合适的平衡点。

In this study,the concentrated silica pulp was modified by thioacyl propyl triethoxyl silane(TPTS) and surfactant PEG-400,and then the silica/NR composites were prepared by latex co-coagulation method using the modified silica pulp. The effect of the ratio of TPTS and PEG-400 on the properties of the composites was studied. The results showed that,compared with the composites using the unmodified silica,the vulcanization rate of the composites with the modified silica increased,the self-aggregation of silica was weakened,and the processability and physical properties were improved. When the mass ratio of TPTS/PEG-400 was 6/2,the reinforcement effect of the modified silica on NR was the best. Specifically,the tensile strength of the composites increased by 33. 6% and the modulus at 300% elongation increased by 47. 4%.When the total amount of TPTS and PEG-400 was constant,with the increase of the amount of PEG-400,the rolling resistance of the composites decreased,but the wet skid resistance also decreased. Through the modification of TPTS and PEF-400,a proper balance between the wet skid resistance and rolling resistance of the composite could be achieved.