硅土／白炭黑复合填料对天然橡胶硫化胶性能的影响  

The Influence of Siliceous Earth/Silica Hybrid Filler on Properties of Natural Rubber

作　　者：陈静 钟杰平[2] 潘荣楷 许逵[3] 苗碗根 何成 

机构地区：[1]岭南师范学院化学化工学院,广东高校新材料工程技术开发中心,物理化学研究所,湛江524048 [2]广东海洋大学理学院,湛江524088 [3]中国热带农业科学院农产品加工研究所,农业部热带作物产品加工重点实验室,湛江524001

出　　处：《高分子通报》2016年第7期62-69,共8页Polymer Bulletin

基　　金：湛江市科技计划项目(201502021);岭南师范学院自然科学研究培育项目(YL1402);公益性行业(农业)科研专项(201403066)

摘　　要：硅土主要是由低温石英和粘土矿物组成的非金属矿物,具有独特的粒片叠置结构。本工作采用经改性处理的硅土与白炭黑并用,测定硅土/白炭黑复合填料对天然橡胶(NR)的硫化特性和力学性能,探讨填料并用对天然橡胶性能的影响。实验结果表明:经改性处理,硅土平均粒径减小,疏水性增强。硅土与白炭黑并用,有利于增强NR硫化初期的流动性,延长焦烧时间而不明显降低硫化速率,能改善橡胶的加工性能。拉伸性能测试结果表明,复合填料与白炭黑或硅土单独使用相比,能显著提高填充NR硫化胶的拉伸强度、定伸应力、交联密度,而不降低橡胶弹性。当硅土占复合填料质量为40%时,NR硫化胶的拉伸强度达到最大。动态机械性能测定结果表明,相比白炭黑,硅土更有利于减小硫化胶的生热和滚动阻力。Siliceous earth is a non-metallic minerals mainly composed of low quartz and clay mineral such as Kaolin and muscovite, has a unique particles and layer superimposed structure. This work adopts silica and siliceous earth as hybrid filler on Natural Rubber （NR）. The vulcanization characteristics and mechanical properties of NR composites were discussed. The results show that after modification, average particle size of siliceous earth decreases. When silica and siliceous earth work together, which is beneficial to enhance liquidity at the beginning stage of NR vulcanization, extend the scorch time and not significantly lower curing rate, can improve the processing performance of rubber. Tensile test results show that the hybrid filler compared with silica or siliceous earth used alone, can improve the tensile strength, modulus and crosslinking density of the NR composites, and in the meanwhile don^t reduce elasticity of NR composites. Siliceous earth and silica has synergistic reinforcement effect on NR. Dynamic mechanical analysis results show that siliceous earth is more advantageous to reduce the heat and rolling resistance of NR vulcanizates.

关 键 词：硅土 白炭黑 天然橡胶 补强性能 

分 类 号：TQ332[化学工程—橡胶工业]