Environment-friendly basic oil for formulating hydraulic fluids
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsFrank Bongardt, Karl Schmid, Reinhold Wuest
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Abstract
An environment-friendly basic oil based on natural materials for the formulation of hydraulic oils having improved viscosity at elevated temperature and lower pour point contains rapeseed oil or soybean oil as the main component, an antioxidant selected from methoxyphenol, ethoxyphenol, butyl hydroxyanisole, butyl hydroxytoluene, methoxyhydroquinone, ethoxyhydroquinone, tertiary butyl hydroquinone, and tocopherol, and an ester of a monocarboxylic acid or a fatty acid.
Claims11
A hydraulic oil composition for hydrostatic power transmission having low viscosity, low pour points, and low-temperature stability consisting of,
- a) purified rapeseed oil or soybean oil as the main oil component,
- b) 0.5 to 5% by weight, based on the weight of the composition, of an antioxidant selected from the group consisting of methoxyphenol, ethoxyphenol, butyl hydroxyanisole, butyl hydroxytoluene, methoxyhydroquinone, ethoxyhydroquinone, tertiary butyl hydroquinone, and tocopherol, and
- c) an ester selected from the group consisting of trimethylol ethane, trimethylol propane, and neopentyl glycol reacted with a monocarboxylic acid which is
- c1) a saturated C.sub.5 -C.sub.10 monocarboxylic acid,
- c2) a fatty acid derived from a source selected from the group consisting of rapeseed oil, soybean oil, and technical grade oleic oil, or mixtures of c1) and c2), wherein said ester component c) is present in at most about equal quantities with respect to said main oil component a).
The process of stabilizing the viscosity, lowering the pour point, and improving the low-temperature stability of a hydraulic oil composition consisting of,
- a) purified rapeseed oil or soybean oil, consisting of adding to said hydraulic oil composition an additive consisting of
- b) from 0.5 to 5% by weight, based on the weight of the additive plus hydraulic oil composition, of an antioxidant selected from the group consisting of methoxyphenol, ethoxyphenol, butyl hydroxyanisole, butyl hydroxytoluene, methoxyhydroquinone, ethoxyhydroquinone, tertiary butyl hydroquinone, and tocopherol, and
- c) an ester selected from the group consisting of trimethylol ethane, trimethylol propane, and neopentyl glycol reacted with a monocarboxylic acid which is
- c1) a saturated C.sub.5 -C.sub.10 monocarboxylic acid, and
- c2) a fatty acid derived from a source selected from the group consisting of rapeseed oil, soybean oil, and technical grade oleic oil, or mixtures of c1) an c2) wherein said ester component c) is present in at most about equal quantities with respect to said oil component a).
A hydraulic oil composition consisting of purified rapeseed oil or soybean oil and mixtures thereof as the main oil component, an ester selected from the group consisting of trimethylol ethane, trimethylol propane, and neopentyl glycol reacted with a monocarboxylic acid which is a saturated C.sub.5 -C.sub.10 monocarboxylic acid, or a fatty acid derived from a source selected from the group consisting of rapeseed oil, soybean oil, and technical grade oleic oil, wherein said ester present in at most about equal quantities with respect to said oil component, and 0.5 to 5% by weight of an antioxidant for stabilizing the viscosity of the hydraulic oil composition selected from the group consisting of methoxyphenol, ethoxyphenol, butyl hydroxyanisole, butyl hydroxytoluene, methoxyhydroquinone, ethoxyhydroquinone, tertiary butyl hydroquinone, and tocopherol, based on the weight of the composition.
Dependencies are inferred from the claim text.