| abstract |
Methanol wetting temperature is 10-49%, especially DBP absorbency (dry matter) is 250g / 100g or more, average particle size is 1-12㎛, and / or carbon content is 0.3-1.85%, and / or loss of drying is 2.6- Partially hydrophobic precipitated silica, characterized by 10.0% and / or pH value of 5.5 to 10.0, mixes an amount of water repellent with precipitated silica suspension at a very short residence time and a low pH value, solids are filtered off, and Prepared by washing to remove, drying, working up with heat and pulverizing.n n n Partially hydrophobic precipitated silicas are used in active material blends and antifoams of active material blends and hydrolysis sensitive materials. |