乳液共混法高岭石/乳聚丁苯橡胶复合材料的絮凝和性能研究

Flocculation and Properties of Kaolinite/ESBR Composite by Emulsion Blending Method

采用乳液共混法制备高岭石/乳聚丁苯橡胶(ESBR)复合材料,研究絮凝剂种类、絮凝剂质量分数和絮凝剂滴加速度对复合材料硫化特性、门尼粘度和力学性能的影响。结果表明:在复合材料絮凝过程中,絮凝剂Al2(SO4)3和KAl(SO4)2电位中和形成的橡胶微粒间排斥力较大,橡胶微粒团聚后形成的胶粒较小且均匀,Al2(SO4)3和KAl(SO4)2质量分数分别为0.050和0.100、滴加速度分别为3和6 mL·min-1时,复合材料的交联程度较高,有效链平均分子质量较小,力学性能较好;在Al2(SO4)3和KAl(SO4)2絮凝的复合材料中高岭石的片层剥离程度较高,分散较均匀,高岭石与橡胶基体形成较强的界面作用。

The kaolinite/emulsion polymerized styrene butadiene rubber(ESBR)composites were prepared by emulsion blending method,the effects of the type of flocculant,the mass fraction of flocculant and flocculant dropping speed on the curing characteristics,Mooney viscosity and mechanical properties of the composites were investigated.The results showed that during the flocculation process of the composite material,the repulsive force between the rubber micro-particles formed by the potential neutralization of the flocculant Al2(SO4)3 and KAl(SO4)2 was greater,and the rubber particles formed after agglomeration of micro-particle were smaller and more uniform.When the mass fractions of Al2(SO4)3 and KAl(SO4)2 were 0.050 and 0.100,respectively,and the drop speeds were 3 and 6 mL·min-1,respectively,the crosslinking degree of the composites was higher,the average molecular weight of the effective chain was smaller,and the mechanical properties were better.The lamellar exfoliation degree of kaolinite in the composites flocculated by Al2(SO4)3 and KAl(SO4)2 was higher,the dispersion was more uniform,and the interfacial interaction between kaolinite and rubber matrix was better.