IRGALUBE 349 PDF

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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. Hydraulic pressure was generated by gear pumps and iggalube power was taken out by means of cylinder-piston devices. What is claimed is: The present invention is concerned with hydraulic fluids based on oily triglycerides of fatty acids.

In addition to the basic composition the hydraulic fluid according to the invention may also comprise other constituents such as:. N,N’-disalicylidene-1,2-propenylenediamine; N,N’-bis beta-3,5-ditertbutylhydroxyphenylpropiono hydrazide.

The flash points of hydrocarbon basic oils are, as a rule, clearly lower. Hydraulic fluids The present invention is concerned with hydraulic fluids based on oily triglycerides of fatty acids. The petroleum-based hydraulic fluids involve, however, a number of environmental and health risks. This is of considerable importance under conditions in which the operating temperature may vary within rather wide limits.

Country of ref document: The test results of Table 8 indicate that the efficiency of the system containing the vegetable oil based fluid decreased slower than that of the mineral oil based fluid. Hydrocarbon-based basic oils 0 – This accounts for the superb ability of triglycerides to be adsorbed on metal faces as very thin adhering films.

Hydrocarbons may constitute a cancer irgslube when in prolonged contact with the skin, as well as a risk of damage to the lungs when inhaled with the air.

The triglyceride suitable for the composition can be defined as an ester of a straight-chain C10 to C22 fatty acid and glycerol which has an iodine number of between 50 and As can bee seen from the results 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 only property of the natural triglycerides which has shown to irgalubw their intended use for hydraulic purposes is their tendency to be easily oxidized. The viscosity indexes of triglycerides are clearly higher than those of hydrocarbon oils with 3499 additives, so that triglycerides are to their nature so-called multigrade oils.

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Irgslube lubricant to be tested is spread on the plate, and it is exposed to the ambient air oxygen during the tests. In the same test also the volumetric efficiency of the irhalube systems 2 and 3 was recorded during the test period and the results are given in the following table 8. One indication of the resistance towards oxidation of oils is also their ability to keep the lubrication properties in higher temperatures.

In this tester the friction between a moving and a stationary element is determined at increasing temperatures.

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The oxidation products are also corrosive. Examples of compounds which belong to the abovemention- ed groups can be named as follows:. 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 22 viscosity class requirement it contains about 65 percent by weight of the base composition and about 35 percent by weight of 2-ethylhexyl oleate.

The test 3, however, shows that the percentage of the antioxidant has not been high enough. A base composition for hydraulic fluids according to the claims 1 or 2, characterized in that the anti- oxidants selected from the irgakube I form 1.

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 oxidation has urgalube negative effects to the properties of a natural triglyceride based hydraulic fluid, wherefore the fluid has to be replaced by fresh fluid more frequently than fluids based on hydrocarbon oils. Certain triglyceride oils, so-called drying oils, contain considerable quantities of alkatrienyl and alkadienyl groups, and they form solid films, under the effect of the oxygen in the air.

The characterizing data of rape seed oil are compared in Table 4 with certain commercial basic mineral oils. Elastomer compatible seal swell additive for automatic transmission fluids, power transmission 439 and hydraulic steering applications. A hydraulic fluid made of a base composition according to claim 5, characterized in that it has the following composition:.

A base composition for hydraulic fluids according to the claim 1, characterized in that the anti-oxidant fraction forms 1. Lubricating oil composition containing friction modifier and corrosion inhibitor.

EP/AW Additive & Corrosion Inhibitor – IRGALUBE┬« 349

Functional fluid with triglycerides, detergent-inhibitor additives and viscosity modifying additives. Refined rape seed oil: The compositions 2 and 9 contain the anti-oxidant additives selected according to the invention, but the amounts used have not been sufficient.

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The following Table 7 gives the viscosity of the oils after a prolonged time in operation. 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. Thus there is an obvious need for fluids for hydraulic purposes which are based on renewable natural resources, and which are, at the same time, environmentally acceptable. The viscosities and viscosity indexes of certain triglycerides are given in Table 2.

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.

Alkylated tertiary amines as high-temperature antioxidants for ester base lubricants.

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The film failure temperature is a measure of the oxidation resistance of the oil. 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.

Olive Peanut Maize Rape oil oil oil oil 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:.

For instance the viscosity of the natural triglyceride hydraulic fluid is increased due to the oxidation. Such oils, the iodine number of which is usually higher than and which are used i. 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: One such a natural base component for hydraulic fluids is the oily triglycerides, as suggested in the patent specification GB 2

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