Stabilized phosphate ester-based functional fluid compositions

C - Chemistry – Metallurgy – 10 – M

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C10M 105/74 (2006.01) C10M 129/10 (2006.01) C10M 129/66 (2006.01) C10M 133/46 (2006.01) C10M 135/10 (2006.01) C10M 145/12 (2006.01) C10M 169/04 (2006.01)

Patent

CA 2136739

A functional fluid comprising a novel base stock composition comprising between about 50% and about 70% by weight of a trialkyl phosphate in which the alkyl substituents are C3 to C8 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 C3 to C8 and are bonded to the phosphate moiety via a primary carbon atom, and from 0 to about 5% by weight of an alkyl diaryl phosphate. Preferably, the alkyl substituents are isobutyl or isopentyl. The fluid 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 viscosity index improver, a perfluoroalkylsulfonate anti-erosion additive, a 3,4-epoxy-cyclohexane carboxylate 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 composition selected from the group consisting of bis(3,5-dialkyl-4- hydroxyaryl)methane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4- hydroyaryl)benzene and mixtures thereof. Preferably, the composition further comprises a 4,5- dihydroimidazole derivative to enhance the stability of the fluid.

Liquide fonctionnel comprenant une nouvelle composition de base contenant entre environ 50 % et environ 70 % en poids d'un phosphate de trialkyle dans lequel les substituants alkyle ont 3 à 8 atomes de carbone et sont fixés à la fraction phosphate par l'intermédiaire d'un atome de carbone primaire, entre environ 18 % et environ 35 % en poids d'un phosphate d'aryle de dialkyle dans lequel les substituants alkyle ont 3 à 8 atomes de carbone et sont liés à la fraction phosphate par l'intermédiaire d'un atome de carbone primaire, et de 0 à environ 5 % en poids d'un phosphate de diaryle d'alkyle. Les substituants alkyle sont, de préférence, l'isobutyle ou l'isopentyle. Le liquide comprend également un épurateur d'acide, un additif anti-érosion, un agent améliorant l'indice de viscosité et un anti-oxydant. Une nouvelle combinaison d'additifs comprend un méthacrylate de butyle/héxyle de masse moléculaire élevée, en tant qu'agent améliorant l'indice de viscosité, un perfluoroalkylsulfonate, en tant qu'additif anti-érosion, un 3,4-époxycyclohexane carboxylate ou un diépoxyde, en tant qu'épurateur d'acide, une di(alkylphényl)amine, et un anti-oxydant phénolique comprenant un mélange d'un 2,4,6-trialkylphénol et d'une composition de polyphénol inhibée sélectionnée dans le groupe constitué de bis(3,5-dialkyl-4-hydroxyaryl)méthane, 1,3,5-triméthyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxyaryl)benzène et des mélanges de ceux-ci. De préférence, la composition comprend également un dérivé 4,5-dihydroimidazole pour améliorer la stabilité du liquide selon l'invention.

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