纳米SiO_2的制备与表面改性  

Preparation and surface modification of nano-silica

作　　者：倪士宝[1] 聂王焰[1] 周艺峰[1] 宋林勇[1] 

机构地区：[1]安徽大学化学化工学院与安徽省绿色高分子材料重点实验室,合肥230039

出　　处：《化工新型材料》2012年第5期119-121,共3页New Chemical Materials

基　　金：安徽省高等学校自然科学研究重点项目(KJ2009A51);安徽大学"211工程"三期建设学术创新团队经费资助

摘　　要：以正硅酸乙酯为硅源,用反相微乳液法制备了单分散SiO2微球。为改善SiO2微球在有机介质中的分散性和相容性,用硅烷偶联剂KH-570对其进行了表面改性。采用FT-IR、TEM、亲油化度及亲油性测定对产物的结构、形貌和性能进行了表征。结果表明:改性SiO2亲油性增加,在有机介质中的分散性明显提高。最佳的改性条件是:改性剂用量为6%,反应温度91℃,反应时间为5h。在此条件下,改性SiO2的亲油化度为21%。With tetraethoxysilane as silicon source,monodispersed silica microspheres were prepared by reversed mi- croemulsion method. Nano-silica was modified using silane coupling agent KH-570 for the improvement of dispersivity and compatibility. The structure,morphology and property of modified Nano-SiO2 were characterized by FT-IR, TEM and li- pophilicity measured. The result showed that the lipophilicity of modified nano-silica was enhanced and its dispersivity in or- ganic medium was significantly improved. The optimum surface modifiction conditions：mass fraction of KH-570 was 6 %; reaction temperature was 91℃ and reaction time was 5h. The lipophilic degree of nano-SiO2 with KH-570 obtained under these conditions was 21%.

关 键 词：纳米二氧化硅 表面改性 硅烷偶联剂 亲油化度 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O613.72[理学—无机化学]