硼改性微粒硅溶胶的超滤浓缩及稳定性

选用超滤法浓缩硼改性微粒硅溶胶,在室温、操作压力3.5 kPa的条件下、选用截留相对分子质量为10000的醋酸纤维素超滤膜浓缩硼改性微粒硅溶胶,其截留率大于93%,可将硼改性微粒硅溶胶浓缩到15%~16%,并且硼改性微粒硅溶胶不易变性。实验采用阴离子及非离子表面活性剂来提高高浓度硅溶胶的稳定性,结果表明,用量0.01%的羧甲基纤维素分散效果最佳,对硼改性微粒硅溶胶的性能几乎没有影响,有利于实现商品化。

Ultrafiltration Concentration and Stability of Microparticle Boron Modified Silica Sol

Ultrafiltration was used to condense microparticle boron modified silica sol because this method made microparticle boron modified silica sol not easy to denaturalize. The optimal uhrafiltration was carried out by using cellulose acetate membrane with molecular weight 10 million and operation pressure 3.5kPa at room temperature. The microparticle boron modified silica sol could be condensed to about 15% - 16% at this uhrafihration conditions. In order to improve the stability of high concentration microparticle boron modified silica sol, anionic or non-ionic surfactants were applied, 0.01% carboxylic methyl cellulose was found to be the best dispersant and had almost no effect on microparticle boron modified silica sol so that it was in favor of this product to be commercialized.