Intermediate composition and process for manufacturing intermedi

Details Intermediate composition and process for manufacturing intermedi Intermediate composition and process for manufacturing intermedi

1991-10-29

1993-09-21

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With subsequent cutting, grooving, breaking, or comminuting

264140, 264141, 264 42, B29B 902

Patent

active

052466540

ABSTRACT:
A method of producing dense, free-flowing alkali metal silicate-based particles which, when sufficiently heated, will form lightweight particles of a spumiform nature which may be employed as thermal or acoustical insulation or as a lightweight filler for gypsum or cement or for numerous other purposes. The method comprises premixing a liquid alkali metal silicate with selected fillers and/or insolubilizers, adjusting the temperature and solids content of the mixture until it passes into a dilatant gel state which will fracture when extended at a rate of between about 3 and 95 cm/minute, and subsequently extruding or pelletizing the gel at this temperature to form particles which are conditioned in an air stream for at least one second and then dried to a moisture level of between about 5 and 30%. These particles or pellets serve as a stable intermediate which can be expanded to form lightweight spumiform particles by further heating at a later time or at a remote location.

REFERENCES:
patent: 2039008 (1936-04-01), Kliefoth
patent: 2117605 (1938-05-01), Fowler et al.
patent: 3728208 (1973-04-01), Whittington et al.
patent: 3756839 (1973-09-01), Rao
patent: 3765919 (1973-10-01), Gelbman
patent: 3951834 (1976-04-01), Gillilan
patent: 4203773 (1980-05-01), Temple et al.

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