二氯二甲基硅烷改性纳米二氧化硅工艺研究

以纳米二氧化硅为原料,乙醇为溶剂,二甲基二氯硅烷为改性剂,水为改性助剂,采用湿法工艺对纳米二氧化硅表面进行了改性研究,分别探讨了改性剂用量、预处理温度、预处理时间、回流温度、回流时间、改性助剂种类及用量对纳米二氧化硅表面改性效果的影响。较佳工艺条件为:二甲基二氯硅烷用量15%,预处理温度120℃,预处理时间50 min,回流温度130℃,回流时间50 min,水用量4%。并通过对纳米二氧化硅表面羟基数的测定验证了纳米二氧化硅的改性效果。

MODIFICATION OF NANO-SILICA BY DICHLORODIMETHYLSILANE

The surface modification of nano-silica was studied using ethanol as solvent,dichlorodime- thylsilane as modification agent,and water as promoter.The effects of factors such as the amount of modification agent,pretreatment temperature,pretreatment time,reflux temperature,reflux time, sorts of promoter,amount of promoter on the surface modification degree of the nano-silica were in- vestigated.The optimum processing conditions were found as follows:15% dichlorodimethylsilane, pretreatment temperature 120℃,pretreatment time 50 min,reflux temperature 130℃,reflux time 50 min,and 4% promoter.