Preparation and Surface Modification of Precipitated Silica
Useing liquid sodium silicate and sulfuric acid as the main raw materials,hexadecanol as a modifier,and toluene sulfonic acid as an additive,precipitated silica was prepared and hydrophobic modification was performd on it.The effects of factors such as modifier dosage,additive dosage,reaction temperature and reaction time on the activity of modified silica were investigated.The experimental results showed that when the dosage of modifier hexadecanol was 20％,the dosage of additive toluenesulfonic acid was 5％,the reaction temperature was 70 ℃,and the reaction time was 30 min-utes,the modified precipitated silica produced had excellent hydrophobicity,and its activation grade was 99.2％.The structure and morphology of the samples before and after modification were characterized by using X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR).The results showed that the prepared precipitated silica had been successfully modified.
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