摘要
利用超重力连续化装置制得超细SiO2的湿滤饼,用硅烷偶联剂KH-570对SiO2表面进行改性以提高其在有机相中的浸润能力。通过红外光谱(FT-IR)、表面羟基数、透射电子显微镜(TEM)、邻苯二甲酸二丁酯(DBP)吸油值、激光粒度分析等表征手段对样品进行了测试分析。结果表明:硅烷偶联剂KH-570是有效的改性剂;改性后样品在有机相中的浸润能力明显提高,样品的DBP吸油值由1.9 mL/g增大到3.1 mL/g;确定了最佳偶联改性条件,反应时间为4 h,改性剂KH-570用量为SiO2质量的10%,改性后样品每平方纳米表面积上的羟基数由1.15nm-2减少到0.9 nm-2。
The ultrafine SiO2 wet cake produced by a hypergravity continuous precipitation apparatus was modified using the silane coupling agent γ-methacryloxypropyltrimethoxysilane （KH-570） to improve its compatibility with organic solvents. The resulting modified ultrafine silica was characterized by Fourier transform infrared spectroscopy （FT-IR）, surface hydroxyl number measurements, transmission electron microscopy （TEM） and di-n-butyl phthalate （DBP） oil absorption measurements. The results showed that KH-570 is an effective modifier as the compatibility of the modified ultrafine silica powder with organic solvents was enhanced, and the DBP oil absorption value increased from 1.9 mL/g to 3.1 mL/g. The optimum reaction conditions were found to involve a modification time of 4 h and a modifier content of 10% of the quantity of silica. The surface hydroxyl number per square nanometer of ultrafine SiO2 was reduced from 1.15 to 0.9 nm^ -2 after modification under these conditions.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第5期30-34,共5页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
