Method for preparing hydrophobic silica gels

Details Method for preparing hydrophobic silica gels Method for preparing hydrophobic silica gels

1997-02-24

1998-08-04

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 21, 528 23, 528 31, C08G 7706

Patent

active

057895147

ABSTRACT:
A method for the preparation of hydrophobic silica gels which are useful as reinforcing fillers in rubber compositions. The method comprises two steps, where in the first step a silica hydrosol is contacted with a sufficient concentration of a strong mineral acid at a pH less than about pH 1 to form a silica hydrogel. In the second step the silica hydrogel is contacted with described organosilicon compounds in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel thereby forming a hydrophobic silica gel having a surface area within a range of about 100 m.sup.2 /g to 750 m.sup.2 /g as measured in the dry state. In a preferred method the hydrophobic silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

REFERENCES:
patent: 3015645 (1962-01-01), Tyler
patent: 3024126 (1962-03-01), Brown
patent: 3122520 (1964-02-01), Lentz
patent: 3979546 (1976-09-01), Lewis
Brunauer Emmett and Teller, Jour. Am.. Chem. Soc., 60:309 (1938).

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