无裂缝二氧化硅凝胶的制备及应用于石材防护研究  

Preparation of Crack - Free Silica and Its Application in Stone Protection

作　　者：徐飞高[1] 李丹[2] 彭伟[2] 迟宝珠[1] 

机构地区：[1]南昌大学理学院,南昌330031 [2]南昌大学环境与化学工程学院,南昌330031

出　　处：《涂料工业》2011年第11期11-15,共5页Paint & Coatings Industry

基　　金：南昌大学博士启动基金资助课题(300650)

摘　　要：烷氧基硅烷通常用于石材防护,最大的缺陷是烷氧基硅烷在石材孔隙干燥过程中形成二氧化硅凝胶表现为开裂。本文综述了使用烷氧基硅烷制备无裂缝二氧化硅的措施,包括添加干燥控制化学剂、纳米粒子、表面活性剂、有机改性剂,同时介绍了催化剂对烷氧基硅烷的水解和缩合影响,对烷氧基硅烷作为石材防护涂料的研究提出了展望。Alkoxysilanes are commonly used for protection of stone while these materials tend to form brittle gels susceptible to cracking during drying. This article reviewed the preparation method of crack - free silica based on alkoxysilanes further incorporated with drying - control chemical additives, nanoparticles, surfactant and organic modifier. The influence of catalysts on the hydrolysis and condensation and structure of the gel was studied. The further prospects of alkoxysilane as a protective coating were also proposed.

关 键 词：无裂缝 二氧化硅 石材 

分 类 号：TQ630.43[化学工程—精细化工]