硬脂酸表面改性叶蜡石增白微粉研究
首发时间:2009-11-11
摘要:为提高叶腊石增白微粉在聚合物材料及涂料体系中的相容性和分散性,需要对其进行表面改性处理。本文用硬脂酸进行表面液相改性,采用红外光谱(IR)、活化指数、粘度以及填充到PVC中的性能对改性效果进行评价,探讨其最佳改性工艺条件。试验采用正交试验设计方案得出硬脂酸改性的最佳工艺条件为:硬脂酸浓度1.25%,浆料浓度7.5%,改性温度30℃和改性时间30min,此时的改性粉体活化指数达到0.995,粘度为163.5mPa•s,微粉表面由原来的亲水变为疏水。研究表明,表面改性微粉填充PVC复合材料性能较好。
关键词: 叶腊石增白粉 硬脂酸 表面改性 正交试验 PVC复合材料
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Surface modification of pyrophyllite powders by stearic acid
Abstract:In order to improve the dispersion and compatibility of pyrophyllite powders in polymer materials and coating system, the calcination-pickling powders need to be surface modified. In present work, stearic acid was used to modify the powders in solution, and the IR, activation ratio, viscosity and the mechanical performance of PVC composite were evaluated. The optimum conditions for stearic acid were explored. We used orthogonal experiment to confirm the optimal condition of stearic acid modification:the concentration of modifier is 1.25%, concentration of slurry is 7.5%, the modification temperature is 30℃, and the modification time is 30min. In optimum conditions the activation coefficient of alcination-pickling powders achieved 0.995, the viscosity was 163.5mPa•s , The surface of naturally hydrophilic pyrophyllite was modified to hydrophobic.and the modified calcination-pickling pyrophyllite was polymer-compatible filler.
Keywords: Alcination-pickling powders Stearic acid Surface modification Orthogonal experiment PVC composit
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