Process for thermally expanding silicate-based material by an in

Details Process for thermally expanding silicate-based material by an in Process for thermally expanding silicate-based material by an in

1981-09-02

1983-08-30

Bell, Mark

Compositions

Exfoliated or intumesced

106 75, 252378P, 264 42, 501 85, C04B 2100, C04B 3516

Patent

active

044015860

ABSTRACT:
Silicate-based composition particles are rapidly and completely expanded to form an expanded, cellular particulate aggregate of maximum density in short periods of time at particle temperatures which are comparatively low, that is, 100.degree. C., compared to existing systems by the utilization of infrared heat sources, either gas or electric, to heat the silicate particles. The use of infrared energy operates in a surprisingly advantageous fashion when the expansion process is carried out on or in the presence of a surface having the capacity to act as a thermal mirror or absorber-reflector of the infrared radiation to make maximum utilization of the radiant energy by the creation of a radiation trap. Carbonaceous materials are preferred for producing such entrapment. A further significant aspect is the discovery of a time-radiation dependency. Thus, an optimum time of exposure for expansion-radiation wave length relationship can be determined so that one may have finite control over expansion of the particles at the least energy cost.

REFERENCES:
patent: 2553759 (1951-05-01), Geiger
patent: 3719510 (1973-03-01), Temple et al.
patent: 3743601 (1973-07-01), Rao
patent: 3756839 (1973-09-01), Rao
patent: 3765919 (1973-10-01), Gelbman
patent: 3830892 (1974-08-01), Wada
patent: 4203773 (1980-05-01), Temple et al.

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