KH570原位改性纳米SiO_2球状颗粒的制备及疏水效果评价  

Preparation of nano-silica spherical particles modified with KH570 and evaluation of its hydrophobic effect

作　　者：王维 张可[1] 房冉冉 刘玉硕 谭向君 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)

机构地区：[1]中国石油大学胜利学院机械与控制工程学院,山东东营257061

出　　处：《中国粉体技术》2019年第3期42-47,共6页China Powder Science and Technology

基　　金：国家级大学生创新创业训练计划项目;编号:201713386021

摘　　要：为了制备疏水纳米SiO_2,提高在聚合物中的分散性,利用改进的Stber法合成出纳米SiO_2;依据脱醇缩合原理,用有机溶剂置换醇水溶剂,以γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)作为改性剂对其进行原位改性;通过红外光谱分析、扫描电镜、粒度分析及一系列疏水性能测试表征产物结构并评价疏水效果。结果表明,经表面改性纳米SiO_2成功接枝上有机基团,颗粒形貌呈规则的球形,粒度约为50 nm,团聚现象明显减弱。通过疏水效果测试,改性后的纳米SiO_2能在有机溶剂中均匀分散,且在石蜡溶剂中能稳定存在1年以上;因其吸水率减小至28%,亲油化度增大至62%,接触角由23. 1°增大至129. 8°,可见疏水效果大幅提高。通过研究改性条件得出:最佳改性剂浓度为60%,最佳改性温度为100℃,最佳改性时间为25 h。In order to prepare hydrophobic nano-SiO2 and improve the dispersibility in polymer materials,the nano-SiO2 was synthesized by the modified Stober 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-SiO2 successfully 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.

关 键 词：Γ-甲基丙烯酰氧基丙基三甲氧基硅烷 改性 纳米SIO2 疏水 

分 类 号：TQ127.2[化学工程—无机化工]