Pavement deicer compositions
AssigneeGeneral Atomics International Services Corporation
InventorsGale L. Hubred, Harold E. Todd
Life of this patent
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Abstract
Liquid deicing and anti-icing compositions are provided by aqueous solutions of (a) alkali metal acetates, e.g., KAc or NaAc, (b) phosphate ion, e.g., K.sub.3 PO.sub.4, and (c) soluble silicate, e.g., K.sub.2 SiO.sub.3 or Na.sub.2 SiO.sub.3. These compositions are environmentally safe and meet FAA standards for metal corrosion resistance. They are effective at very low temperatures, e.g. -40.degree. F., and provide particularly effective deicing compositions when used in combination with granular CMA.
Claims7
An environmentally benign liquid deicing or anti-icing aqueous composition useful for deicing airplane runways consisting essentially of an aqueous solution containing about 40 to about 60 weight percent of potassium acetate and containing in an amount of about 1 weight percent or less of said total composition about 2200 parts per million (ppm) phosphate ion;
- and about 100-800 ppm soluble potassium or sodium silicates.
A method of deicing roadway surfaces comprising applying an effective amount of an aqueous deicing composition to said surfaces, which deicing composition comprises an aqueous solution of about 40 to about 60 weight percent alkali metal acetate and containing in an amount of about 1 weight percent or less of said total composition;
- at least about 900 ppm phosphate ion;
- and about 100-800 ppm alkali metal silicates.
Dependencies are inferred from the claim text.