硅藻土对白炭黑/NR/SSBR复合材料性能的影响

Influence of Diatomite on the Properties of Silica/NR/SSBR Composites

硅藻土和白炭黑与天然橡胶(NR)/溶聚丁苯橡胶(SSBR)机械共混制备了复合材料,研究了复合材料的工艺性能、动态性能和力学性能,并观察了复合材料的微观断裂形貌。结果表明:随着硅藻土用量增大,复合材料的硫化时间减小、门尼粘度增大、Payne效应增强、损耗因子变大、力学性能下降,但焦烧时间、60℃时的损耗因子变化较小;当硅藻土用量为20份时能减小白炭黑的团聚和凝胶化现象,复合材料的Payne效应较弱,微观分散均匀,硅藻土用量为10~20份时拉伸强度和定伸应力较大;而用量为30份时复合材料0℃时的损耗因子较大。

Diatomite and silica were mechanically blended with natural rubber(NR)/dissolved styrene butadiene rubber(SSBR) to prepare composite materials. The process, dynamic properties and mechanical properties of the composites were studied, and the fracture morphology of the composites was observed by SEM. The results showed that with the increase of diatomite content, the vulcanization time of the composites decreased, the Mooney viscosity and the Payne effect increased, the loss factor increased too, while the mechanical properties decreased;but the scorch time and the loss factor at 60 ℃ were changed little. When the dosage of diatomite was 20 phr, the agglomeration and gelation of silica were reduced, the Payne effect of the composite was weaker and the microstructure was uniform;When the dosage of diatomite was 10~20 phr, the tensile strength and modulus were higher. When the dosage of diatomite was 30 phr, the loss factor of the composite at 0 ℃ was larger.