1.前言 水玻璃砂推广中的一个老大难问题就是溃散性差,为了改善水玻璃砂的溃散性,国内外铸造工作者做了大量研究工作,规纳起来主要从两个方面入手:其一是减少玻璃状硅酸钠的加入量,从而减少砂粒间玻璃状硅酸钠粘接桥的面积;其二是削弱玻璃态硅酸钠粘结膜本身与砂粒表面的附着强度.我们在第二种 1. Introduction Water glass sand in the promotion of a chronic problem is the collapse of poor, in order to improve the collapse of sodium silicate sand, domestic and foreign foundry workers have done a lot of research work, to accommodate up mainly from two aspects: First, Reducing the amount of glassy sodium silicate added to reduce the area between the sandglass glassy sodium silicate bridge; the other is to weaken the adhesion of the glassy sodium silicate binder film itself to the surface of the sand .In the second