Hydrolysis and polycondensation of ethyl silicates. 3. Hydrolysis and polycondensation of ETS40 (ethyl silicate 40) in the presence of water colloidal silica sols期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

Hydrolysis and polycondensation of ethyl silicates. 3. Hydrolysis and polycondensation of ETS40 (ethyl silicate 40) in the presence of water colloidal silica sols

Authors:	J Cihl&#x;

Institution:	Technical University of Brno, Technická 2, 616 69 Brno, Czechoslovakia

Abstract:	The hydrolysis and condensation of ETS40 (ethyl silicate 40) in the presence of water colloidal silica sols were studied with the aid of gas chromatography, potentiometry and gelation tests. The acids HCl, H₂SO₄, HNO₃, HCOOH, (COOH)₂ and p-toluenesulfonic acid were used as catalysts. Water—ethanol solutions of the reaction products of the hydrolysis and condensation of ETS40 in the presence of water colloidal silica sols were stable for more than 2 years. This stability was caused by a low water content in the water—ethanol solutions of the reaction products, a stable pH of about 2.0 and by bonded or non-bonded interactions between ETS40 hydrolysates (ethoxyhydroxysiloxanes) and large particles of water colloidal silica sols.

Keywords:	Colloidal silica condensation ethyl silicate hydrolysis kinetics
本文献已被 ScienceDirect 等数据库收录！