Fire fighting with thixotropic foam

Details Fire fighting with thixotropic foam Fire fighting with thixotropic foam

1976-03-25

1977-11-29

Padgett, Benjamin R.

Compositions

Fire-extinguishing

Foam or gas phase containing

252 2, 252 805, 252307, 252316, 536 1, A62D 100

Patent

active

040604896

ABSTRACT:
Aqueous foam formed with solution containing thixotropic polysaccharide in addition to foaming agent, will gel when projected onto a burning hydrophilic liquid, and such foam is not destroyed by the liquid, so that it is suitable to fight fires on hydrophilic liquids as well as on hydrophobic liquids and on solids that are compatible with the foam. The thixotropic character enables the ready pumping of the foam and of the solution from which it is formed. A substantial content of N-methyl pyrrolidone-2 in a concentrate for such foam-producing solution can make such concentrate more adaptable for ready dilution and also improves its stability. Urea can be added to help solubilize the polysaccharide, and it will also reduce the viscosity of a concentrate. Other ingredients can also be included such as to form films over hydrophobic liquids to improve the stability of the foam that is formed and to increase the thixotropic action.

REFERENCES:
patent: 2514310 (1950-07-01), Busse et al.
patent: 2529211 (1950-11-01), Busse et al.
patent: 3301848 (1967-01-01), Halleck
patent: 3334052 (1967-08-01), Kurz
patent: 3383307 (1968-05-01), Goetz
patent: 3480546 (1969-11-01), Bashaw et al.
patent: 3557016 (1971-01-01), Schuppner
patent: 3562156 (1971-02-01), Francen
patent: 3562176 (1971-02-01), Stancioff et al.
patent: 3619842 (1971-11-01), Maierson
patent: 3677347 (1972-07-01), Rosen et al.
patent: 3741805 (1973-06-01), Crotty et al.
patent: 3849315 (1974-11-01), Chiesa, Jr.
patent: 3915800 (1975-10-01), Kang et al.
patent: 3957657 (1976-05-01), Chiesa, Jr.
patent: 3957658 (1976-05-01), Chiesa, Jr.

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