METHOD OF PREPARING DEPOSITED SILICON DIOXIDE, AND DEPOSITED SILICON DIOXIDE PREPARED BY SAID METHOD Russian patent published in 1999 - IPC

FIELD: chemical industry. SUBSTANCE: silicon dioxide is prepared by reacting alkali metal silicate with acidifying agent and using aluminium compound, alkalizing agent and subsequently separation of suspension by filtration and delamination in the presence of other aluminium compound, and drying. Deposited silicon dioxide has specific surface of 100-240 sq.cm/q, oil absorption of lower than 300 ml/100 g and pore distribution is such that volume of pores with diameter of is at least 50% of volume of pores with diameter of less or equal to 400 , average diameter after desagglomeration induced by ultrasound is less than 5 mcm, and aluminium content is at least 0.35 wt %. EFFECT: satisfactory rheological properties of elastomers and improved mechanical properties thereof. 36 cl, 2 ex, 4 tbl