Lubricating oil composition for industrial gears and method for producing same

Abstract

O provide an industrial gear oil which has extremely excellent temperature viscosity characteristics, while having excellent stability of thermal oxidation resistance. A lubricating oil composition for industrial gears, which contains 10-90% by mass of (A) a lubricant base oil that has a kinematic viscosity at 100 degC of 1-100 mm2 / s, a viscosity index of 100 or more and a pour point of 0 degC or less and 90-10% by mass of (B) a liquid random copolymer of ethylene and an alpha-olefin, said random copolymer being produced using a specific catalyst (with the total of (A) and (B) being 100% by mass), and which is configured such that the kinematic viscosity at 40 degC is 100-10,000 mm2 / s.

Description

technical field [0001] The present invention relates to a lubricating oil composition for industrial gears and a manufacturing method thereof. Background technique [0002] Gears of reducers and transmissions used in industrial equipment such as machine tools and wind power generators tend to be subjected to a higher load than gears used in automobiles, and wear of the gears often becomes a problem. In order to protect the gears, a lubricating oil is used which tends to form an oil film with a higher viscosity than lubricating oil for automobiles. In addition, in order to reduce the maintenance cost due to replacement of lubricating oil, a lubricating oil excellent in long-term stability is required (Non-Patent Document 1). [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. In various industrial fields, there is an increasing demand for reduction in power consumption. In order...

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Problems solved by technology

However, α-olefin polymers have problems of insufficient shear stability and poor long-term stability

In addition, polybutene has problems such as poor temperature viscosity characteristics, low temperature characteristics, and poor heat resistance stability.

[0005] In order to improve the above problems, the use of specific kinematic viscosity (100 ° C kinematic viscosity 30 ~ 350mm 2 / s) of ethylene-α-olefin copolymers, but from the viewpoint of achieving both low torque at low temperature and oil film formation at high temperature, there is room for improvement (Patent Document 3)

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