液体天然橡胶对湿法混炼制备天然橡胶/白炭黑复合材料性能的影响

采用湿法混炼工艺制备天然橡胶/白炭黑(W(NR/SiO_2))复合材料,并采用液体天然橡胶(LNR)为增容剂,探讨了LNR对复合材料硫化特性、橡胶加工性能、白炭黑分散性、静态力学性能及动态性能的影响。结果表明:LNR具有较好的增容效果;使用LNR增容后,胶料的正硫化时间缩短,在白炭黑为70 phr时T_(90)缩短4.16 min,加工性能改善;白炭黑在NR中的分散性提高;胶料力学性能得到改善,在白炭黑为60 phr时最明显,拉伸强度和撕裂强度分别提高25.73%和66.59%;LNR增容后胶料的抗湿滑性提高且滚动阻力降低。复合材料良好的相容性是LNR与NR和白炭黑两相同时发生作用形成增容界面的结果。

Effect of Liquid Natural Rubber on Properties of Natural Rubber /Silica Composite Prepared by Wet Compounding

Natural rubber/silica composites (NR/SiO2 )was prepared by wet compounding technology with liquid natural rubber (LNR)as compatibilizer.Curing characteristics,processing properties,filler dispersion and mechanical properties were investigated. The results showe that the optimum cure time is decreased 4.16 min,the processing properties of the composites were improved with the incorporation of LNR;better silica dispersion in NR in presence of LNR;the when silica is 60 phr,tensile strength and tear strength of the vulcanizates were increase 25.73% and 66.59%respectively;as far as the dynamic mechanical properties are con-cerned,the W(NR/SiO2 )composites with LNR owned a combination of high wet skid resistance and low rolling resistance.It is re-vealed that LNR has better compatibility,which is attributed to LNR reaction with both NR and SiO2 to form compatibilizing interface.