Novel method for preparing precipitated silica, precipitated...

C - Chemistry – Metallurgy – 01 – B

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C01B 33/193 (2006.01)

Patent

CA 2717028

The invention relates to a method for preparing precipitated silica, and to precipitated silica including clusters of large primary silica particles having at the surface thereof small primary silica particles, wherein said silica has: a specific surface area CTAB (SCTAB) of 60 to 400 m2/g; a cluster average size d50, as measured by XDC grading after ultrasound de-agglomeration, such that d50 (nm) > (6214 / SCTAB (m2/g)) + 23; a porous volume distribution such that V(d5 - d50) / V(d5 - d100) > 0.906 - (0,0013 x SCTAB (m2/g)); and a pore size distribution such that Mode (nm) > (4166 / SCTAB (m2/g)) 9.2. The invention also relates to the use of the silica as reinforcing filler for polymers.

L'invention concerne un procédé de préparation de silices précipitées, ainsi que des silices précipitées formées d'agrégats de grosses particules primaires de silice à la surface desquels se trouvent des petites particules primaires de silice, ces silices possédant : une surface spécifique CTAB (S CTAB) comprise entre 60 et 400 m2/g, une taille médiane d50 d'agrégats, mesurée par granulométrie XDC après désagglomération aux ultra-sons, telle que : d50 (nm) > (6214 / S CTAB (m2/g)) + 23, une répartition du volume poreux telle que : V(d5 - d50)/ V(d5 - d100) > 0,906 - (0,0013 x S CTAB(m2/g)), et une distribution de tailles de pores telle que : Mode (nm) > (4166 / S CTAB(m2/g)) - 9,2. Elle est également relative à l'utilisation de ces silices comme charges renforçantes de polymères.

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