Claims
- 1. A deicing/antiicing fluid for aircraft based on a glycol, water and a crosslinked polyacrylic acid as thickener, consisting essentially of:
- a) 40-70% by weight of a glycol selected from the group consisting of the alkylene glycols of 2 or 3 carbon atoms and oxyalkylene glycols o from 4 to 6 carbon atoms, or a mixture thereof,
- b) 0.1-1.0% by weight of a crosslinked polyacrylic acid which in the form of a 0.5% strength by weight aqueous solution at pH 7.0 a Brookfield viscometer at 20 rpm,
- c) 0.02-1.5% by weight of a nonionic surfactant formed from an alcohol of from 10 to 20 carbon atoms reacted with from 1 to 10 molecules of a low molecular weight alkoxide,
- d) 0.05-2.0% by weight of one or more corrosion inhibitors,
- e) 0.2-0.7% by weight of a mixture of potassium hydroxide and sodium hydroxide containing up to 70% by weight of potassium hydroxide, or of pure sodium hydroxide, to the fluid pH to 7.0-9.5,
- f) 0.01-0.1% by weight of an antioxidant, and
- g) water to 100% by weight, all the weight percentages being based on the weight of the fluid, and wherein the deicing/antiicing fluid has a holdover time of at least about 30 minutes as measured by the AEA freezing rain endurance test and a viscosity of from about 2000 mPa.s to not greater than about 4000 mPa.s when measured at 20.degree. C. using a Brookfield viscometer at 0.3 rpm.
- 2. A fluid as claimed in claim 1, wherein component (c) is an oxo alcohol of from 10 to 20 carbon atoms in the carbon chain which has been ethoxylated with from 1 to 10 molecules of ethylene oxide.
- 3. A fluid as claimed in claim 1, wherein component (e) is a mixture of potassium hydroxide and sodium hydroxide in a ration of from 2.5:1 to 1:2.5.
- 4. A fluid as claimed in claim 1, which contains components a) to f), in the following amounts:
- a) from 50 to 60% by weight
- b) from 0.2 to 0.6% by weight
- c) from 0.02 to 1.5% by weight
- d) from 0.1 to 2.0% by weight
- e) from 0.2 to 0.7% by weight
- f) from 0.01 to 0.1% by weight
- g) water to make up to 100% by weight.
- 5. A fluid as claimed in claim 1, wherein said glycol is selected from the group consisting of 1,2-propylene glycol, 1,3-propylent glycol, diethylene glycol and mixtures thereof.
- 6. A fluid as claimed in claim 2, wherein said nonionic surfactant is an oxo alcohol of from 13 to 15 carbon atoms, ethoxylated with 3 molecules of ethylene oxide.
- 7. A fluid as claimed in claim 6, wherein said holdover time is 35 times.
- 8. A fluid as claimed in claim 7, wherein said holdover time is 37 minutes.
- 9. A fluid as claimed in claim 8, wherein said holdover time is 39 minutes.
- 10. A fluid as claimed in claim 1, said nonionic surfactant being present in an amount of from 0.02 to 0.3%.
- 11. A fluid as claimed in claim 10, said nonionic surfactant being present in an amount of from 0.05 to 0.3%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3832310 |
Sep 1988 |
DEX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 07/408,234 filed on Sep. 18. 1989 now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4064065 |
Stoll |
Dec 1977 |
|
4358389 |
Konig-Lumer et al. |
Nov 1982 |
|
4954279 |
Ma et al. |
Sep 1990 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
0231869 |
Aug 1987 |
EPX |
2423893 |
Dec 1975 |
DEX |
1285862 |
Aug 1972 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
408234 |
Sep 1989 |
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