Method for making coated ultra-fine ammonium perchlorate particl

Details Method for making coated ultra-fine ammonium perchlorate particl Method for making coated ultra-fine ammonium perchlorate particl

1971-02-22

1976-05-04

Padgett, Benjamin R.

Explosive and thermic compositions or charges

Structure or arrangement of component or product

Coated component

149 199, 149 1991, 149 76, 149113, 427 57, 427215, 427220, 427221, C06B 2922, C06B 4532

Patent

active

039545261

ABSTRACT:
Sub-micron particle size ammonium perchlorate particles are made by mixing a solution of ammonium perchlorate in a volatile liquid with a second less volatile liquid which is miscible with the first liquid and is a non-solvent for ammonium perchlorate. The resulting mixture is heated to vaporize the volatile liquid and form a suspension of fine ammonium perchlorate particles in the second liquid. A particle coating agent soluble in the second liquid is used to limit particle growth. The particles are coated with the coating agent and may be recovered from the suspension by vaporization of the second liquid to form a powder, or by partial evaporization of the second liquid to form a concentrated slurry or paste in which the ammonium perchlorate is the disperse phase. The ultra-fine particles formed are suitable for use in propellant formulations.

REFERENCES:
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patent: 2973257 (1961-02-01), Ryker
patent: 3160535 (1964-12-01), Wells
patent: 3190776 (1965-06-01), Ender
patent: 3222231 (1965-12-01), Markels
patent: 3226784 (1966-01-01), Owen et al.
patent: 3235589 (1966-02-01), Berenbaum et al.
patent: 3452445 (1969-07-01), Higgins
patent: 3523839 (1970-08-01), Shechter et al.
patent: 3539377 (1970-11-01), Steinle
patent: 3563966 (1971-02-01), Lowrey et al.

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