Lubricating oil composition for hydraulic oil and method for producing same

Abstract

To provide a lubricating oil composition for hydraulic oil, the composition having very exceptional temperature-viscosity characteristics as well as exceptional heat and oxidation stability. This lubricating oil composition for hydraulic oil contains: 10-99 mass% of a lubricating oil base oil (A) having a kinematic viscosity at 100 degC of 1-14 mm2 / s, a viscosity index of 100 or greater, and a pour point of 0 degC or less; and 90-1 mass% of a liquid random copolymer (B) of ethylene and an alpha-olefin, the copolymer being produced using a specific catalyst (the total of (A) and (B) being 100 mass%). The lubricating oil composition moreover has a kinematic viscosity at 100 degC of 10-300 mm2 / s.

Description

technical field [0001] The present invention relates to a lubricating oil composition for hydraulic oil and a production method thereof. Background technique [0002] Among industrial equipment and machinery, in machine tools / molding machines requiring large working energy, such as injection molding machines, machine tools, press processing machines, forging processing, etc., hydraulic pressure pumps that can convert the pressurized energy of hydraulic pumps into kinetic energy (working energy) are often used. system. In addition, hydraulic systems are widely used in any construction machinery such as forklifts, wheel loaders, skid steer loaders, and tractors. [0003] On the other hand, global warming is intensifying, and it is urgent to reduce the emission of carbon dioxide, one of the greenhouse gases. Along with this, reduction of power consumption is also required in hydraulic systems used in various industrial fields as described above. In order to reduce the power ...

AI Technical Summary

Problems solved by technology

However, all the disclosed compositions have high viscosity and are not sufficient for the purpose of saving energy.

Although studies have been conducted on the use of synthetic oils (polyalphaolefins) with sufficiently low viscosity and excellent temperature-viscosity characteristics in the form of monomers, there is still room for research (Patent Document 3)

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