利用偶联剂对硅灰石表面进行处理,制备了硅灰石粉填充改性尼龙1212复合材料.研究了偶联剂用量和硅灰石含量对复合材料力学性能的影响,分析了硅灰石填充对复合材料热变形温度和热膨胀系数的影响.结果表明,加入质量分数1.0%的KH-550型硅烷偶联剂,当硅灰石的质量分数为40%时,复合材料的拉伸强度、弯曲强度较尼龙1212提高了11%和64%,冲击强度基本保持不变.同时,复合材料的热变形温度提高了93%,热膨胀系数有明显的降低,吸水率下降了55%,材料尺寸稳定性有明显提高.
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