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A study of the operation of 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. The oxidation products are also corrosive. The lubricating properties were compared also by using a gear system, which test is described in the following Example 5.
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 irgqlube the base composition.
A base composition for hydraulic fluids according to the claim 4, characterized in that the triglyceride consists of rape seed oil. The fluids were tested with an apparatus irgzlube to the test method ASTM D by introducing into a pressure vessel ml of the fluid to be tested.
Alkylene oxide adducts of phosphosulfurized N- hydroxyalkyl alkenylsuccinimides. Alkylated tertiary amines as high-temperature antioxidants for ester base lubricants. The characterizing data of rape seed oil are compared in Table irgalbue with certain commercial basic mineral oils. Country of ref document: 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.
A base composition for hydraulic fluids according to the claims 1 or 2, characterized in that the anti- oxidants selected from the group I form 1.
A hydraulic fluid made of a base composition according to claim 5, characterized in that it has the following composition:. Thus there is an obvious need for fluids for hydraulic purposes which are based on renewable natural resources, and iralube are, at the same time, environmentally acceptable. Hydraulic fluids The present invention is concerned with hydraulic fluids based on oily triglycerides of fatty irgalub.
N,N’-disalicylidene-1,2-propenylenediamine; N,N’-bis beta-3,5-ditertbutylhydroxyphenylpropiono hydrazide. As the moving element is used a steel ball having a diameter of 6 mm, whereas the stationary element consists of a steel plate.
IOCL Supply of Amine phosphate either Irgalube ST 4 Tender Notice
Hydraulic pressure was generated by gear pumps and the power was taken out by means of cylinder-piston devices. The above data indicate that the said triglycerides have many properties which are of advantage especially in hydraulic fluids. In the same test also the volumetric efficiency of the hydraulic systems 2 and 3 was recorded during the test period and the results are given in the following table 8.
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. It is characteristic of all of these oily triglycerides that their viscosities change on change in temperature to a lesser extent than the viscosities of hydrocarbon basic oils. The only property of the natural triglycerides which has shown to impede their intended use for hydraulic purposes is their tendency to be easily oxidized.
The vessel was closed and placed into boiling water. Refined rape seed oil The present invention is concerned with hydraulic fluids based on oily triglycerides of fatty acids. The flash points of hydrocarbon basic oils are, as a rule, clearly lower. 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 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.
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Vanderbilt; Additin 10, 2,6-di-tertiary-butylmathylphenol, Rhein-Chemie. 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.
Higher percentages of the anti-oxidants give results which are superior to the results of commercial hydrocarbon based hydraulic oils. DE DED1 en The hydraulic fluids commonly used are petroleum-based, chemically saturated or unsaturated, straight-chained, branched or ring-type hydrocarbons. 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.
DE DET2 en 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.
A base composition for hydraulic fluids consisting of:. A vegetable oil based hydraulic fluid was tested using as a reference a commercial mineral oil based hydraulic fluid.
Refined rape seed oil. The oils tested are given in the Table 9. One indication of the resistance towards oxidation of oils is also their ability to keep the lubrication properties in higher temperatures.