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A vegetable oil based hydraulic fluid was tested using as a reference a commercial mineral oil based hydraulic fluid. Higher percentages of the anti-oxidants give results which are superior to the results of commercial hydrocarbon based hydraulic oils.


Refined rape seed oil: DE DED1 en Refined rape seed oil Functional fluid with triglycerides, detergent-inhibitor additives and viscosity modifying additives. This ability was tested in the following example 2.

The above data indicate that the said triglycerides have many properties which are of advantage irgaluve in hydraulic fluids. It has, however, been noted that the tendency of the said natural triglycerides to be oxidized can be decreased essentially to the same level as that of the common hydrocarbon based hydraulic oils, by using additives in very moderate amounts, which additives have been selected according to the invention.

The fluids were irgaluube with an apparatus according to the test method ASTM D by introducing into a pressure vessel ml of the fluid to be tested.

IRGALUBE (CAS# ) – 扬子化学网

The fraction of the anti-oxidant additives is selected preferably among hindered phenolics and aromatic amines, but can be completed by compounds selected from metal salts irgwlube dithioacids, phosphites, sulfides, amides, non-aromatic amines, hydrazides and triazols. A hydraulic fluid made of a base composition according to any of the preceeding claims 1 to 5, characterized in that in order to comply with the ISO VG 68 viscosity class requirement it contains about 80 percent by weight of the base composition, about 14 percent by weight of pentaerythritol ester and about 6 percent by weight of a complex ester.


One indication of the resistance towards oxidation of oils is also their ability to keep the lubrication properties in higher temperatures. According to the invention the anti-oxidant fraction in the composition forms 2. In this example the stability of the hydraulic fluids against oxidative degradation was tested. A study of the operation irgalubw glide faces placed in close relationship to each other, and considering pressure and temperature to be the fundamental factors affecting lubrication, shows that the film-formation properties of triglycerides are particularly advantageous in hydraulic systems.

During the test the oxygen pressure in the vessel was determined. A hydraulic fluid made of a base composition according to claim 5, characterized in that it has the following composition:. Such oils, the iodine number of which is usually higher than and which are used i.

WO1988005808A1 – Hydraulic fluids – Google Patents

A base composition for hydraulic fluids according to the claims 1 to 3, characterized in that the triglyceride is of oleic-acid-linoleic-acid type and contains saturated fatty acids of not more than 20 percent by weight calculated on the quantity of fatty acids esterified with glycerol. A hydraulic fluid made of a base composition according to any of the preceeding claims 1 to 5, characterized in irgalubf the fluid in addition contains at least one component selected from: Irgalhbe base composition for hydraulic fluids according to the claims 1 or 2, characterized in that the anti- oxidants selected from the group I irgalubd 1.

Irgalibe pressure was generated by gear pumps and the power was taken out by means of cylinder-piston devices. Alkylene oxide adducts of phosphosulfurized N- hydroxyalkyl alkenylsuccinimides. The triglyceride oils differ from the non-polar hydrocarbons completely in the respect that they are of a polar nature. Alkylated tertiary amines as high-temperature antioxidants for ester base lubricants.

The viscosity-to-temperature ratio characteristic of each oil can be characterized by means of the empiric viscosity index VIthe numerical value of which is the higher the less the viscosity of the oil concerned changes with a irgalubee in temperature.


DE DET2 en From a base composition according to the invention was made hydraulic fluids for different viscosity classes ASTM D The oils tested are given in the Table 9. From the data in Table 5 it can be derived that a triglyceride complying with the definitions presented at the beginning of this description irga,ube containing a certain amount of carefully selected anti-oxidant additives can form a base for a fluid composition usable for hydraulic purposes.

The following Table 7 gives the viscosity of 3449 oils after a prolonged time in operation. In the tests conducted the ball was pressed towards the plate by a force of 40 N during its reciprocating movement having an amplitude of 5 mm and a frequency of 20 Hz.

The triglycerides described in the said specification GB 2 are glycerol esters of fatty acids, and the chemical structure of the said esters can be defined by means of the following formula: A1 Designated state s: The test 3, however, irgaluube that the percentage of the antioxidant has not been high enough.

In addition to the above, hydrocarbon irgalubbe as such have in fact a rather limited applicability for hydraulic purposes, wherefor the hydraulic fluids based on such oils contain a variety of additives in considerable amounts. The triglyceride may also, according to the teaching of the specification GB 2contain a small quantity of an alkatrienylic acid residue, but a larger quantity is detrimental, because it promotes oxidation of the triglyceride oil.

US USA en In addition it can be expected that the ability of the polar triglyceride molecule to adhere onto metallic surfaces improves the lubricating properties of these triglycerides.