Stabilized, corrosion-inhibited fire retardant compositions and

Details Stabilized, corrosion-inhibited fire retardant compositions and Stabilized, corrosion-inhibited fire retardant compositions and

1998-04-03

1999-09-28

Green, Anthony

Compositions: coating or plastic

Coating or plastic compositions

Contains fireproofing or biocidal agent

106 1824, 106 1825, 106 1826, 252 4, 252 6, 252 65, 252 7, 252601, 252602, 252603, 252607, 169 46, 169 47, A62D 100

Patent

active

059581174

DESCRIPTION:

BRIEF SUMMARY
This invention relates to fire retardant compositions, especially adapted for preventing and fighting wildfires.
More particularly, the invention concerns such compositions which have improved stability.
In another respect, the invention concerns such compositions which have reduced corrosivity to ferrous metals.
In still another aspect, the invention relates to fire retardant compositions which are specially adapted to preventing and/or preventing the spread of wildfires and which are especially suited to aerial application.
According to yet another, more specific aspect, the invention concerns fire retardant compositions, specially adapted for aerial application, which are thickened with a carbohydrate thickening agent, such as galactomanan or derivitized galactomanan thickening agent, e.g., guar gum, hydroxypropyl guar, and the like, yet which have a combination of reduced corrosivity and increased stability.
A wide variety of fire retardant compositions which are used to prevent or combat the spread of wildfires (forest fires, range fires, etc.) have been proposed. Generally such compositions contain a fire retardant salt (e.g., ammonium phosphate--monobasic ammonium phosphate (MAP) and/or dibasic ammonium phosphate (DAP)--, ammonium polyphosphate, ammonium sulfate, and the like), an aqueous liquid vehicle, and various functional additives which improve specific characteristics of the composition. These functional additives may include, e.g., thickeners (to improve the aerial drop and fuel coverage characteristics), corrosion inhibitors (to reduce the corrosivity of the compositions to metal components of storage and application equipment), coloring agents (to improve the accuracy and coverage of successive aerial applications), stabilizing agents (to prevent separation of the various components of the composition during storage and transport), spoilage inhibitors (to prevent microbial decomposition of certain components), etc.
Illustrative examples of such prior art fire retardant compositions are disclosed in the U.S. Pat. Nos. 3,196,108 (Nelson) and 3,730,890 (Nelson), 3,960,735(Lacey), 4,176,071 (Crouch), 3,634,234 (Morgenthaler) 3,257,316 (Langguth), 4,822,524 (Strickland), 4,447,336 (Vandersall) and 4,839,065 (Vandersall).
As illustrated by the Crouch '316, Strickland '524, Morgenthaler '234 and Vandersall '336 patents, various natural and synthetic gums are advantageously used to thicken fire retardants compositions. Fire retardants containing such cellulosic thickeners are, however, notably susceptible to instability, causing the components to lose viscosity over extended storage periods. Unfortunately, the other functional additives, may cause or contribute to such instability problems. Thus, it has been observed that reduced corrosivity and improved stability are contradictory requirements for certain additives for fire retardants that are thickened with natural or synthetic galactomanan gum components.
Certain prior art functional additives which provide a measure of corrosion and/or stability control have been identified as having adverse impacts on human health and are listed as such by various governmental fire fighting agencies. In particular, the use of thiourea in fire retardants has been prohibited by the United States Forest Service.
It would be highly desirable to provide a non-toxic corrosion inhibitor for gum-thickened fire retardants which did not degrade the long-term stability of the compositions.
It would also be highly desirable to provide a non-toxic viscosity stabilizer for gum-thickened fire retardants which did not degrade the corrosion characteristics of the compositions.
In particular, it would be highly desirable to provide a non-toxic functional additive for gum thickened fire retardants which improves both the corrosivity and stability of gum-thickened fire retardants.
It has now been discovered that gum-thickened fire retardant compositions, containing a selected corrosion inhibitor additive, reduces the corrosivity of the composition to ferrous metals without sacri

REFERENCES:
patent: 4151099 (1979-04-01), Nassry et al.
patent: 4176071 (1979-11-01), Crouch
patent: 4212920 (1980-07-01), Seamans
patent: 4272414 (1981-06-01), Vandersall
patent: 4392994 (1983-07-01), Wagener
patent: 4447336 (1984-05-01), Vandersall
patent: 4447337 (1984-05-01), Adl et al.
patent: 4606831 (1986-08-01), Kegeler et al.
patent: 4822524 (1989-04-01), Strickland
patent: 4983326 (1991-01-01), Vandersall

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