憎水劑 主要用作礦物質的防水劑，如粗陶瓷制品的防水、石膏和石膏纖維板的防水
等，也可作為水玻璃的添加物使用。主要成分為甲基硅酸鉀，它的效防水作用機理是在水和二氧化碳作用下，生成甲基硅醇，甲基硅醇自身進一步縮合并與結構材料起化學反應，在基材表面生成一層幾個分子厚的不溶性的防水高分子化合物——網狀有機硅樹脂膜。這種樹脂膜具有防水、防潮、防滲、通氣性、化性、抗污染性和耐侯性等特點。
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