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合成了仅具有乙氧基或仅具有硫黄基团的单功能偶联剂和各分子侧链分别仅具有一个乙氧基的偶联剂。比较了这些偶联剂和TESPT对轮胎胎面硫化胶机械性能的影响。实验结果证明,为了提高白炭黑补强轮胎胎面胶的性能,偶联剂需要适当的功能性平衡。TESPT能赋予最好的功能性平衡,因为它可以通过其三乙氧基甲硅烷基团与白炭黑产生初级偶联反应和次级偶联反应,并通过其硫黄成分与橡胶聚合物产生硫黄给予体和偶联反应。仅具有1个依附于硅原子的反应性乙氧基的偶联剂能起到非常好的作用。这种偶联剂仅能与白炭黑进行初级反应(初级反应在混炼中会导致非常快的平衡和低的混炼扭矩)。用这种偶联剂获得的硫化胶性能,特别是代表轮胎滚动阻力的60℃tanδ最接近用TESPT获得的性能,只有拉伸强度低于用TESPT获得的拉伸强度。
A monofunctional coupling agent having only an ethoxy group or having only a sulfur group and a coupling agent having only one ethoxy group on the side chain of each molecule were synthesized. The effects of these coupling agents and TESPT on the mechanical properties of tire tread vulcanizates were compared. Experimental results show that, in order to improve the performance of the tire tread rubber reinforced with carbon black, the coupling agent needs proper functional balance. TESPT gives the best functional balance because it produces primary and secondary coupling reactions with its triethoxysilyl groups and white carbon black and produces sulfur yellow through its sulfur content and rubbery polymer Donors and coupling reactions. A coupling agent having only one reactive ethoxy group attached to a silicon atom can play a very good role. This coupling agent is only capable of primary reaction with silica (the primary reaction leads to very fast equilibration and low mixing torque during compounding). The vulcanizate properties obtained with this coupling agent, and especially the tan? At 60C, which represents the tire rolling resistance, are the closest to those obtained with TESPT except that the tensile strength is lower than the tensile strength obtained with TESPT.