WANG Wei， ZHANG Ke， FANG Ranran，LIU Yushuo， TAN Xiangjun

(School of Mechanical and Control Engineering， Shengli College of China University of Petroleum， Dongying 257061， China)

Abstract: In order to prepare hydrophobic nano-SiO2 and improve the dispersibility in polymer materials, the nano-SiO2 was synthesized by the modified Stöber method. According to the principle of dealcohol condensation, organic solvents were used to replace alcohol water solvents, and γ-methacryloxypropyltrimethoxysilane(KH570)was used as modifier to modify in-situ. The infrared spectroscopy, scanning electron microscope, particle size analysis and a series of hydrophobic performance tests were used to characterize the product structure and evaluate the hydrophobic effect. The results show that the organic group is grafted onto the surface of nano-SiO2successfully through surface modification and the morphology of particle which size is about 50 nm with regularly spherical while agglomeration obviously reduces. The test of hydrophobic effect shows that the modified nano-SiO2 can be uniformly dispersed in organic solvent and can be stable in paraffin solvent for more than 1 year. Owing to its water absorption decreases to 28% and lipophilicity increases to 62% as well as the contact angle increases from 23.1° to 129.8°， hydrophobic effect of the modified nano-SiO2 is increased substantially. The investigation of the optimized modification show that the best modifier concentration is 60%， the best modification temperature is 100 ℃ and the best modification time is 25 h.

Keywords: γ-methacryloxypropyltrimethoxysilane；modification；nano-SiO2；hydrophobic

中图分类号：TQ127.2

文献标志码：A

收稿日期： 2018-03-17，修回日期:2018-07-26，在线出版时间：2019-04-12 08:40。

基金项目：国家级大学生创新创业训练计划项目，编号：201713386021。

第一作者简介：王维(1989—)，女，硕士，助教，研究方向为材料的合成及表面改性。E-mail：459084179@qq.com。

文章编号：1008-5548(2019)03-0042-06

DOI:10.13732/j.issn.1008-5548.2019.03.008