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以双-[γ(-三乙氧基硅)丙基]四硫化物改性凹凸棒石纳米纤维为增强填料,研究改性凹凸棒石填充丁苯橡胶的性能与偶联改性的关系。通过正交试验,探讨偶联剂用量、研磨时间、球磨机转数、酸用量等参数对复合橡胶性能的影响,优化凹凸棒石粉体的改性和加工工艺;通过研究偶联剂用量对填充复合橡胶的力学性能、应力应变、交联密度以及凹凸棒石晶体结构的影响,探讨凹凸棒石补强橡胶的机理。结果表明,凹凸棒石表面接枝的有机官能团能促进复合橡胶交联密度提升,交联密度与复合橡胶的定伸应力成正相关性,与其扯断伸长率成反比。
The relationship between the properties of the modified attapulgite filled SBR and the coupling modification was studied by using the double - [γ (- triethoxysilyl) propyl] tetrasulfide modified attapulgite nanofibers as reinforcing filler. Through the orthogonal test, the influence of coupling agent dosage, milling time, ball mill rotation number, acid dosage and other parameters on the properties of composite rubber was discussed, and the modification and processing technology of attapulgite powder was optimized. Mechanical properties of composite rubber, stress and strain, crosslinking density and attapulgite crystal structure of the impact of attapulgite reinforced rubber mechanism. The results showed that the organic functional groups grafted on the surface of attapulgite could promote the crosslinking density of the composite rubber to increase. The crosslinking density was positively correlated with the ultimate tensile stress of the composite rubber, which was inversely proportional to the elongation at break.