【摘要】 以甲基含氢硅油为改性剂、二氯甲烷为硅油分散剂,采用干法对沉淀法白炭黑粉体进行表面改性,考察了改性剂用量和分散剂用量对改性效果的影响,并通过正交试验优化了工艺条件。试验结果表明,改性后沉淀法生产的白炭黑疏水性明显提高。其最佳工艺条件为:取8 g未改性的沉淀法白炭黑、甲基含氢硅油用量0.6 g、硅油分散剂用量2.4 g、恒温温度120℃、恒温成膜时间30 min,改性产物活化度达到96%以上。由红外光谱分析可知甲基含氢硅油成功键合到白炭黑表面,通过白炭黑疏水性试验及白炭黑粉体在水—油体系中的分散试验,结果证实改性后的白炭黑具有良好的疏水亲油性。更多还原

【Abstract】 Surface modification is made for precipitated silica with dry method using methyl hydrogen polysiloxane oil as modifier and methylene chloride as silicone oil dispersant,to investigate the influence of modifier quantity and dispersant quantity on the modification performance,and the process conditions are optimized through orthogonal experiment. The experimental results indicate that,the hydrophobicity of precipated silica after modification is significantly increased. The optimum process conditions are: take 8 g unmodified precipated silica,methyl hydrogen polysiloxane oil consumption is 0. 6 g, methylene chloride consumption is 2. 4 g,constant temperature is 120 ℃,film forming time is 30 min,and degree of activation of the modified products is more than 96%. Through infrared spectroscopy we can see,methyl hydrogen polysiloxane oil is successfully bonded to the surface of the silica. Results of hydrophobic test of silica and dispersion test of silica powder in water-oil system show that modified silica possesses excellent hydrophobic and lipophilic property.更多还原