Shaped articles of silicate material, a process for their produc

Details Shaped articles of silicate material, a process for their produc Shaped articles of silicate material, a process for their produc

1985-10-31

1986-12-23

Martin, Roland E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264 44, 264 56, 264113, 264235, 264346, 501 80, 501123, 501133, 501154, B29C 2760

Patent

active

046311580

ABSTRACT:
A process for the production of shaped articles from silicate material by extrusion and/or pelleting and subsequent annealing is described. In this process, pulverulent layered silicic acids of the general formula H.sub.2 Si.sub.y O.sub.2y+1, in which y is a number from 1.7 to 24, or salts thereof, in which all or some of the H is replaced by at least one cation from the group comprising Li.sup.+, Na.sup.+, K.sup.+, NH.sub.4.sup.+, Ca.sup.2+, Cu.sup.2+, Co.sup.2+, Ni.sup.2+ and Mg.sup.2+, are mixed with water or an organic solvent, the mixture is extruded and/or pelleted to give roll-shaped or tube-shaped pieces and these are then dried and annealed under conditions such that the starting material is chiefly converted into cristobalite and/or tridymite. The same material can also be pressed in a molding tool under pressure. Under these conditions, shaped articles which predominantly consist of cristobalite or tridymite and have a Shore hardness of at least 70 can be obtained.

REFERENCES:
patent: 3620783 (1971-11-01), Mahler et al.
patent: 3788866 (1974-01-01), Flood et al.
patent: 3927697 (1975-12-01), Baumler et al.
patent: 3940255 (1976-02-01), Harrington et al.
patent: 4039339 (1977-08-01), Elmer et al.
patent: 4049464 (1977-09-01), Tutsek et al.
patent: 4180409 (1979-12-01), Manimann
patent: 4346177 (1982-08-01), Cochet et al.
patent: 4384046 (1983-05-01), Nakagami
patent: 4410502 (1983-10-01), Yamaguchi et al.

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