Hybrid binder having reduced organic solvent content for use in

Details Hybrid binder having reduced organic solvent content for use in Hybrid binder having reduced organic solvent content for use in

1991-12-02

1993-06-29

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

10628714, 10628716, C04B 3514, B22C 120

Patent

active

052230309

ABSTRACT:
A fast-curing hybrid binder is disclosed which is suitable for use in refractory molds, which has the advantage of a reduced organic-solvent content. The binder contains two silica sources: colloidal silica and a prehydrolyzed organosilicate in the form of a mixture of an alkylpolysilicate and an alkyl or aryl alkoxy silane, preferably selected from the group consisting of C.sub.1 to C.sub.6 alkyl trialkoxy silanes, di (C.sub.1 to C.sub.6) alkyl dialkoxy silanes, phenyl trialkoxy silane, diphenyl dialkoxy silane, and mixtures thereof. Preferably, the alkylpolysilicate is prehydrolyzed tetraethyl orthosilicate and the alkoxy silane is methyl triethoxy silane, dimethyl diethoxy silane or a mixture thereof.

REFERENCES:
patent: 3392036 (1968-07-01), McLeod
patent: 3432312 (1969-03-01), Feagin
patent: 3576652 (1971-04-01), Teicher et al.
patent: 3961968 (1976-06-01), Wales
patent: 4769076 (1988-09-01), Watanabe et al.

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