| 摘要 |
The invention concerns a novel method for preparing precipitated silica used as reinforcing filler for elastomers. It also concerns novel silica precipitates in the form of powder, granules or, preferably, substantially spherical balls, said silica being characterised in that they contain: a BET specific surface area ranging between 185 and 250 m<2>/g; a CTAB specific surface area ranging between 180 and 240 m<2>/g; a porous distribution such that the porous volume V2 consisting of pores with diameter ranging between 175 and 275 ANGSTROM represents less than 50 % of the porous volume V1 consisting of pores with diameter not more than 400 ANGSTROM ; a porous volume (Vd1) consisting of pores with diameter less than 1 mu m more than 1.65 cm<3>/g; a fineness number (I.F) between 70 and 100 ANGSTROM ; a fines contents ( tau f) after ultrasound disintegration, of at least 50 %. |
