硅烷法表面接枝氧化铝对环氧复合材料和特高压盆式绝缘子性能的影响

为了研究微米级填料表面纳米化修饰对环氧复合材料和特高压盆式绝缘子性能的影响,采用硅烷法表面接枝技术,制备出不同粒径增加值的表面纳米化修饰的微-纳复合氧化铝填料。通过掺混不同比例的微-纳复合氧化铝填料,制备了环氧复合材料和特高压盆式绝缘子,测定其机械性能、电气性能和热性能,并与未掺混的环氧复合材料和特高压盆式绝缘子进行对比。结果表明:掺杂硅烷法表面接枝的氧化铝填料后,环氧复合材料和盆式绝缘子的热性能和电气性能基本不变,但机械性能提升明显。添加表面接枝氧化铝填料的环氧复合材料拉伸强度随粒径增加值增大而减小,随掺混比例先增大后减小,掺混比例为15%时,拉伸强度最大,达到90.88MPa,提升了16.5%,特高压盆式绝缘子压力试验破坏值提升了15%。氧化铝表面接枝对于提高环氧复合材料机械性能,提升特高压盆式绝缘子可靠性具有实际意义。

Effect of Surface Grafted Alumina by Silane Method on Properties of Epoxy Composites

In order to study the influence of micro-filler surface modification on the properties of epoxy compositesand UHV basin insulator, surface nano-modified micro-nano alumina filler with different particle size increase values was prepared by the surface grafting of silane method. Epoxy/alumina composites and UHV basin insulator were prepared by blending different proportions of micro-nano alumina fillers to determine their mechanical properties, electrical properties and thermal properties, and compared with unblend epoxy compositesand UHV basin insulator. The results showed that the thermal and electric properties of epoxy composites and UHV basin insulator remained constant after blending carboxylic acid surface grafted alumina filler. however, mechanical properties increased obviously. the tensile strength of epoxy composites increased by 16.5%, the failure pressure value of UHV basin insulator increased by15% when the alumina mass fraction was 15%. With the increase of alumina particle size increased, the electric strength decreased. Alumina surface grafting has practical significance for improving the mechanical properties of epoxy composites and improving the reliability of UHV basin insulator.