云母粉表面改性提高云母纸拉伸强度的研究

摘要

利用硅烷偶联剂"分子桥"作用对云母粉进行表面处理.通过自乳化改性的环氧树脂和聚丙烯酰胺,使云母粉表面桥联的环氧基团发生交联反应,显著提高云母纸拉伸强度.结果表明:当硅烷偶联剂、改性环氧树脂、聚丙烯酸胺的质量分数分别为0.5%、1.O%、0.5%时.云母纸拉伸强度由72.17 N/m提高到151.3 N/m.硅烷偶联剂水解产生的硅羟基与云母表面的羟基发生化学键的结合,另一端的氨基与改性环氧树脂中的环氧基团反应,增强了改性环氧树脂对云母表面的结合力.%The surface of mica particles was modified using the “molecular bridge” effect of silane coupling agent to process mica surface and adding the self-emulsifying modified epoxy resin and polyacrylamide.The mica surface connected epoxy groups occurred the crosslmking reaction, which significantly improved the tensile strength of mica paper.The results showed that when the mass fraction of silane coupling agent, modified epoxy resin and polyacrylamide was 0.5％, 1.0％ and 0.5％ respectively, the tensile strength of mica papers increased 72.17 N/m to 151.3 N/m.It was found that the silicon hydroxyl formed by silane coupling hydrolyzed connected hydroxyl on the mica surface with chemical bond, the other side of the amnino groups reacted with epoxy groups in the modified epoxy resin to enhance the adhesion of modified epoxy resin for the mica surface.