无机填料的表面处理及其在导热天然橡胶复合材料中的应用

用季戊四醇、丙三醇和钛酸酯偶联剂分别对氧化铝、氧化镁和高岭土进行表面改性,并将改性填料填充天然橡胶(NR)制备了导热复合材料,考察了表面处理剂种类及其用量对无机填料的影响,并研究了季戊四醇改性氧化铝填充NR复合材料的硫化特性、物理机械性能和导热性能.结果表明,3种填料中季戊四醇的改性效果最好,且其用量为1.0～1.5份时对氧化铝的改性效果最佳;随着改性氧化铝填充量的增加,复合材料的最大转矩、300%定伸应力、拉伸强度和热导率均增大,当其用量为60份时,改性氧化铝填充NR复合材料的热导率比未填充NR复合材料提高了23.9%.

Surface treatment of inorganic filler and its application in thermal conductive natural rubber composite

Alumina, magnesia and kaolin were modified with pentaerythritol, propanetriol and titanate coupling agent, respectively, and the thermal conductive composites were prepared by the modified fillers filling natural rubber(NR).Effect of type and amount of surface treating agents on inorganic fillers was investigated, and the vulcanization behaviour, mechanical properties and thermal conductivity of composites filled with pentaerythritol modified alumina were studied.The results showed that modification effect of pentaerythritol was best in 3 types of filler, and its optimum amount for alumina was 1.0-1.5 phr.With the increasing amount of modified alumina, the maximum torque, modulus at 300%, tensile strength and thermal conductivity increased, and the thermal conductivity of the composite filled with 60 phr modified alumina improved by 23.9% compared to that of unfilled NR composite.