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What is claimed is: In addition, water cannot force a triglyceride oil film off a metal face as easily as a hydrocarbon film.
The fluids were tested with an apparatus according to the test method ASTM D by introducing into a pressure vessel ml of the fluid to be tested. The compositions 2 and 9 contain the anti-oxidant additives selected according to the invention, but the amounts used have not been sufficient.
The only property of the natural triglycerides which has shown to impede jrgalube intended use for hydraulic purposes is their tendency to be easily oxidized. This ability was tested in the following example 2. Alkylene oxide adducts of phosphosulfurized N- hydroxyalkyl alkenylsuccinimides. The ability of the hydraulic fluids according to the invention was also tested in a full scale test, which is described in the following example 3.
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However, it is to be kept in mind that applicable triglyceride oils differ from rape seed oil only in respect of the composition of the fatty acids esterified with glycerol, which difference comes out as different pour points and viscosities of the oils.
The lubricant to be tested is spread on the plate, and it is exposed to the ambient air oxygen during the tests. The viscosity index irfalube the triclyceride oils is apparently also more stable against mechanical and heat stresses existing in the hydraulic irgaube than the viscosity index of the hydraulic fluids based on formulated 3449 oils and containing polymeric viscosity index improves.
Combination of phosphate based additives and sulfonate salts for hydraulic fluids and lubricating compositions. 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: The viscosities and viscosity indexes of certain triglycerides are given in Table 2.
The present invention is concerned with hydraulic fluids based on oily triglycerides of fatty acids. One such a natural base component for hydraulic fluids is the oily triglycerides, as suggested in the patent specification GB 2 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.
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.
During iryalube test the oxygen pressure in the vessel was determined. DE DET2 en Particularly suitable are the triglycerides of the oleic acid-linoleic acid type which contain no more than 20 per urgalube by weight of esterified saturated fatty acids calculated on the quantity of esterified fatty acids.
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. Olive Peanut Maize Rape oil oil oil oil Hydrocarbons may constitute a cancer risk when in prolonged contact with the irhalube, as well as a risk of damage to the lungs when inhaled with the air.
A base composition for hydraulic fluids according to the claims iraglube or 2, characterized in irgzlube the anti- oxidants selected from the group I form 1. This accounts for the superb ability of triglycerides to be adsorbed irgalubf metal faces as very thin adhering films. Examples of compounds which belong to the abovemention- ed groups can be named as follows:.
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According to the invention the anti-oxidant fraction in the composition forms 2. 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: Alkylated tertiary amines as high-temperature antioxidants for ester base lubricants. The additives used were: US USA en The following Table 7 gives the viscosity of the oils after a prolonged time irgaalube operation.
A hydraulic fluid made of a base composition according to claim 5, characterized in that it has the following composition: Refined rape seed 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:.
The triglyceride may also, according to the teaching of irgzlube 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. A hydraulic fluid made of a base composition according to any of the krgalube claims 1 to 5, characterized in that in order to comply with the ISO VG 68 viscosity class requirement it contains irglube 80 percent by weight of the base composition, about 14 irgalubw by weight of pentaerythritol ester and about 6 percent by weight of a complex ester.
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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 46 viscosity class requirement it contains about 77 percent by weight of the base composition and about 23 percent by weight of pentaerythritol ester. The following table 12 gives one example of adjusting possibilities.
In addition to the basic composition the hydraulic fluid according to the invention may also comprise other constituents such as:. 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 of dithioacids, phosphites, sulfides, amides, non-aromatic amines, hydrazides and triazols.
From a base composition according to the invention was made hydraulic fluids for different viscosity classes ASTM D