IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0099267
(1993-07-28)
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발명자
/ 주소 |
- Deetman Gerbrand (St. Charles MO)
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출원인 / 주소 |
- Monsanto Company (St. Louis MO 02)
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인용정보 |
피인용 횟수 :
20 인용 특허 :
0 |
초록
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A fluid composition suitable for use as an aircraft hydraulic fluid is disclosed. The fluid composition comprises a fire resistant phosphate ester base stock comprising between about 10% and about 100% by weight of a trialkyl phosphate, between about 0% and about 70% by weight of a dialkyl aryl phos
A fluid composition suitable for use as an aircraft hydraulic fluid is disclosed. The fluid composition comprises a fire resistant phosphate ester base stock comprising between about 10% and about 100% by weight of a trialkyl phosphate, between about 0% and about 70% by weight of a dialkyl aryl phosphate, and from about 0% to about 25% by weight of an alkyl diaryl phosphate, with the proviso that the sum of the proportionate amount of each base stock component must equal 100%. The alkyl substituents of the trialkyl phosphate, the dialkyl aryl phosphate, and the alkyl diaryl phosphate contain between 3 and 8 carbon atoms, preferably between 4 and 8 carbon atoms, more preferably between 4 and 5 carbon atoms, and are bonded to the phosphate moiety via a primary carbon. It is still further preferred that the alkyl substituents of the trialkyl phosphate, the dialkyl aryl phosphate, and the alkyl diaryl phosphate are isoalkyl groups. The fluid composition further comprises an acid scavenger, an anti-erosion additive, a viscosity index improver, and an antioxidant. A novel additive combination comprises a high molecular weight butyl/hexyl methacrylate viscos ity index improver, a perfluoroalkylsulfonate anti-erosion additive, a 3,4-epoxycyclohexanecarboxylate or a diepoxide acid scavenger, a di(alkylphenyl)amine, and a phenolic antioxidant comprising a mixture of a 2,4,6-trialkylphenol and a hindered polyphenol compound selected from the group consisting of bis(3,5-dialkyl-4-hydroxyaryl)methane, 1,3,5-trialkyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxyaryl)benzene and mixtures thereof. Preferably, the fluid composition further comprises a benzotriazole derivative as a copper corrosion inhibitor, and a 4,5-dihydroimidazole derivative, as an iron cor rosion inhibitor and to enhance the stability of the fluid.
대표청구항
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A fluid composition suitable for use as an aircraft hydraulic fluid, comprising: (a) a fire resistant phosphate ester base stock, the base stock comprising between about 50% and about 85% by weight of a trialkyl phosphate in which the alkyl substituents are substantially isoalkyl C4 or C5 and are bo
A fluid composition suitable for use as an aircraft hydraulic fluid, comprising: (a) a fire resistant phosphate ester base stock, the base stock comprising between about 50% and about 85% by weight of a trialkyl phosphate in which the alkyl substituents are substantially isoalkyl C4 or C5 and are bonded to the phosphate moiety via a primary carbon atom, between about 18% and about 35% by weight of a dialkyl aryl phosphate in which the alkyl substituents are as previously defined, and between about 0% and about 5% by weight of an alkyl diaryl phosphate in which the alkyl substituent is as previously defined, with the proviso that the sum of the proportionate amount of each base stock component must equal 100%; (b) an acid scavenger in an amount effective to neutralize phosphoric acid and phosphoric acid partial esters formed in situ by hydrolysis of any of the phosphate esters of said base stock; (c) an anti-erosion additive in an amount effective to inhibit flow-induced electrochemical or zeta corrosion of the flow-metering edges of hydraulic servo valves in hydraulic systems; (d) a viscosity index improver in an amount effective to cause the fluid composition to exhibit a viscosity of at least about 3.0 centistokes at about 210°F., at least about 9.0 centistokes at about 100°F., and less than about 4200 centistokes at -65°F.; and (e) an antioxidant in an amount effective to inhibit oxidation of fluid composition components in the presence of oxidizing agents.
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