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As can bee seen from the orgalube of Table 5, the compositions 3, 4, 5, 6, 8, 10, 11, 12, 13 and 14 are clearly comparable with the common mineral-oil based hydraulic oils 15 and 16 used for comparison in this example.

The fraction of the anti-oxidant additives is idgalube preferably among hindered phenolics and aromatic amines, but can be completed by compounds selected from metal salts of dithioacids, phosphites, sulfides, amides, non-aromatic amines, hydrazides and triazols.

Linoleic acid C The compositions 2 and 9 contain the anti-oxidant additives selected according to the invention, but the amounts used have not been sufficient. According to the invention the anti-oxidant fraction in the composition forms 2. 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:.

A hydraulic fluid made of a base composition according to claim 5, characterized in that it has the iralube composition:. The ability irgqlube the hydraulic fluids according to the invention was also tested in a full scale test, which is described in the following example 3. From the data in Table 5 it can be derived that a triglyceride complying with the definitions presented at the beginning of this description and containing a certain amount of carefully selected anti-oxidant additives can form a base for a fluid composition usable for hydraulic purposes.

Olive Peanut Maize Rape oil oil oil oil Hydraulic fluids The present invention is concerned with hydraulic fluids based on oily triglycerides of fatty acids.

Lubricating oil composition containing friction modifier and corrosion inhibitor. A hydraulic fluid made of a base composition according to any of the preceeding claims 1 to 5, characterized in that the fluid in addition contains at least one component selected from: One such a natural base component for hydraulic fluids is the oily triglycerides, as suggested in the patent specification GB 2 The film failure temperature is a measure of the oxidation resistance of the oil.

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In this tester the friction between a moving and a stationary element is determined at increasing temperatures. A base composition for hydraulic fluids according to the claim 1, characterized in that the anti-oxidant fraction forms 1. The viscosity indexes of triglycerides are clearly higher than those of hydrocarbon oils with no additives, so that triglycerides are to their nature so-called multigrade oils.

Preferred amount of the anti-oxidant s in the fluid is 1. The oxidation causes also foaming of the fluid, the filtration properties of the fluid are decreased, and the higher water solubility causes problems in the hydraulic system.

DE DED1 en Particularly suitable are the triglycerides of the oleic acid-linoleic acid type which contain no more than 20 per cent by weight of esterified saturated fatty acids calculated on the quantity of esterified fatty acids.

Hydraulic pressure was generated by gear pumps and the power was taken out by means of cylinder-piston devices. As mentioned already before, the viscosity index VI of triglycerides, as compared with mineral oil products, is superior. The temperature in which the friction began to increase sharply was registered, and it was used as an indication of the failure of the lubricative film between the ball and the plate.

From the base composition according to the invention can be made hydraulic fluids for different purposes by adjusting its viscosity. Moreover, oil allowed to escape into the environment causes spoiling of the soil and the ground water, even in small quantities. Such oils, the iodine number of which is usually higher than and which are used i.

US USA en They are also toxic to the aquatic life in rivers, lakes, etc. In this example the stability of the hydraulic fluids against oxidative degradation was tested. 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.

Alkylated tertiary amines as high-temperature antioxidants irgaalube ester base lubricants. The oils tested are given in the Table 9. As the moving element is used a steel ball having a diameter of 6 mm, whereas the stationary element consists of a steel plate. The hydraulic fluids commonly used are petroleum-based, chemically saturated or 394, straight-chained, branched or ring-type hydrocarbons. In addition to the basic composition the hydraulic fluid according to the invention may also comprise other constituents such as:.

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Country of ref document: The following table 12 gives one example of adjusting possibilities. A hydraulic fluid made of a base composition according to claim 5, characterized in that it has the following composition: The result is clearly better if the oil contains also a small amount of other anti-oxidant Irgalubeirfalube phosphate derivative, test 5.

The 439 3, however, shows that the percentage of the antioxidant iraglube not been high enough.

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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 32 viscosity class requirement it contains percent by weight of the base composition.

The base composition for hydraulic fluids, and hydraulic fluid is prepared on the basis of the jrgalube. Refined rape seed oil. A1 Designated state s: 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 46 viscosity class requirement it contains about 77 percent by weight of the base composition and about 23 percent by weight of pentaerythritol ester.

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The test results of Table 7 indicate that the durability against shear stress of the vegetable oil based fluid was better than that of the mineral oil based fluid. The lubricant to be tested is spread on the plate, and it is exposed to the ambient air oxygen during the tests. In addition it can be expected that the ability of the polar triglyceride molecule igralube adhere onto metallic surfaces improves the lubricating properties of these triglycerides.

Hydrocarbons may constitute a cancer risk when in prolonged contact with the skin, as well as a risk of damage to the lungs when inhaled with the air. Of the rape seed oils mentioned in the table, the first one eruca has been obtained from a sub-species that has a high content of erucic acid 3449 Irgalubeamino phosphate derivative, Ciba-Geigy; Irganox Lmixture of tertiary-butyl phenol derivatives, Ciba-Geigy; Reomet 39, triazole derivative, Ciba-Geigy; Anqlamol 75, zinc dialkyldithio-phosphate, Lubrizol; ENkortacid T derivative, Akzo Chemie; Hitecmixture of tertiary-butyl phenol derivatives.

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