湿法混炼技术制备环烷油增塑天然橡胶/白炭黑复合材料的性能

Properties of naphthenic oil-plasticized natural rubber/silica composites prepared by wet mixing technology

使用优选的乳化剂对增塑剂环烷油(NAP)进行乳化,制得均一稳定的NAP乳化液,采用湿法混炼技术,使用所得的NAP乳化液与天然胶乳和白炭黑(SiO_(2))浆液制备了NAP增塑的天然橡胶(NR)/SiO_(2)(NAP/NR/SiO_(2))复合材料,研究了NAP添加量对NAP/NR/SiO_(2)复合材料门尼黏度、物理机械性能、动态力学性能、SiO_(2)分散性、耐热空气老化性能和屈挠龟裂性能的影响。结果表明,NAP/NR/SiO_(2)复合材料的门尼黏度较NR/SiO_(2)复合材料显著降低,Payne效应明显减弱,而动态力学性能和加工性能则明显提升;NAP添加量为10份(质量)时,NAP/NR/SiO_(2)复合材料的综合性能达到最佳,其拉伸强度与NR/SiO_(2)复合材料相比略微下降,而扯断伸长率则有不同程度的上升;加入NAP后,NR/SiO_(2)复合材料的耐热空气老化性能和屈挠龟裂性能得到了改善。

The preferred emulsifier was used to emulsify the plasticizer naphthenic oil(NAP),and uniform and stable NAP emulsion was prepared.The NAP-plasticized natural rubber(NR)/silica(SiO_(2))(NAP/NR/SiO_(2))composite was prepared using the resulting NAP emulsion,NR latex and SiO_(2) slurry by wet mixing process,and the effects of NAP addition amount on Mooney viscosity,physical and mechanical properties,dynamic mechanical properties,dispersion of SiO_(2),thermal air aging resistance and flexural cracking property of NAP/NR/SiO_(2) composites were studied.The results showed that Mooney viscosity of NAP/NR/SiO_(2) composite was significantly lower than that of NR/SiO_(2) composite,Payne effect was significantly weakened,and dynamic mechanical properties and proces-sability improved significantly.When NAP addition amount was 10 phr(mass),NAP/NR/SiO_(2) composite had the best comprehensive performance,and tensile strength of NAP/NR/SiO_(2) composite decreased slightly,whereas elongation at break increased to varying degrees when compared with those of NR/SiO_(2) composite.Thermal air aging resistance and flexural cracking property of NR/SiO_(2) composite improved after the addition of NAP.