Partially hydrophobic precipitated silica with a methanol crosslinking potential of 10-49% is new. When anhydrous, the silica has a DBP absorption 250 g/100 g. The average particle size is 1-12 mu m and the silica has a carbon content of 0.3-1.85 %, and when dried, it loses 2.6-10 % of its weight. It has a pH of 5.5-10. The silica is prepared by mixing a silica suspension (which has been prepared using known methods) with a material that gives the silica hydrophobic properties. The mixing takes place for a very short time at conditions of low pH and high shear. The resulting suspension is filtered and washed in salt-free conditions, and the filter cake is dried, thermally treated and powdered.
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机译：甲醇交联潜力为10-49％的部分疏水性沉淀二氧化硅是新的。无水时，二氧化硅的DBP吸收> 250 g / 100 g。平均粒径为1-12微米，二氧化硅的碳含量为0.3-1.85％，干燥后其重量损失2.6-10％。 pH值为5.5-10。通过将二氧化硅悬浮液（已经使用已知方法制备）与赋予二氧化硅疏水性质的材料混合来制备二氧化硅。在低pH和高剪切的条件下，混合进行非常短的时间。将得到的悬浮液过滤并在无盐条件下洗涤，并将滤饼干燥，热处理并粉末化。
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