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Lubricating oil composition

A technology of lubricating oil composition and copolymer, which is applied in the direction of lubricating composition, petroleum industry, additives, etc., and can solve problems such as easy change of viscosity, impaired fluidity, and difficulty in forming oil film

Active Publication Date: 2021-05-28
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In general, lubricating oil compositions have the following problems: if the temperature changes, the viscosity is likely to change, for example, if the viscosity is greatly reduced, the formation of an oil film is likely to become difficult, and on the other hand, if the viscosity is greatly increased, fluidity is impaired

Method used

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  • Lubricating oil composition
  • Lubricating oil composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7、 comparative example 1～12

[0112] Lubricating oil compositions were prepared by blending base oil, polymer, and additive package in the types and amounts shown in Tables 1 and 2. It should be noted that the blending amounts of the polymers and additive packages described in Tables 1 and 2 are blending amounts in active ingredient conversion (resin component conversion) excluding diluent oil.

[0113] Details of the base oil, polymer and additive package used in the preparation of the lubricating oil composition are as follows.

[0114]

[0115] ・Base oil (a-1): Paraffin-based mineral oil classified as Group II, kinematic viscosity at 40°C = 9.4mm 2 / s, kinematic viscosity at 100℃=2.6mm 2 / s, viscosity index=109.

[0116] ・Base oil (a-2): Paraffin-based mineral oil classified as Group II, kinematic viscosity at 40°C = 8.8mm 2 / s, kinematic viscosity at 100℃=2.4mm 2 / s, viscosity index=86.

[0117]

[0118] · OCP (b-1): Mw=20000 ethylene-alpha-olefin type copolymer.

[0119] · OCP (b-2): Mw=1500...

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Abstract

Provided is a lubricating oil composition which comprises a lube base oil (A), an olefin-based copolymer (B), and a poly(alkyl (meth)acrylate) (C), wherein the olefin-based copolymer (B) has a weight-average molecular weight of 10,000-80,000, the content of the olefin-based copolymer (B) is 0.01-0.23 mass% with respect to the whole lubricating oil composition, and the content of the poly(alkyl (meth)acrylate) (C) is 0.02-0.40 mass% with respect to the whole lubricating oil composition.

Description

technical field [0001] This invention relates to lubricating oil compositions. Background technique [0002] For lubricating oil compositions used in the lubrication of sliding parts of various devices such as hydraulic devices, fixed transmissions, and automotive transmissions, it is required to have a certain fluidity in any environment at high or low temperatures, and to easily form an oil film. . [0003] In general, lubricating oil compositions have the following problems: if the temperature changes, the viscosity is likely to change, for example, if the viscosity is greatly reduced, the formation of an oil film is likely to become difficult, and on the other hand, if the viscosity is greatly increased, fluidity is impaired . Therefore, a lubricating oil composition is required to have a low temperature dependence of viscosity. [0004] In addition, as another function of the lubricating oil composition, it has a cooling effect. The lubricating oil composition coole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M157/00C10M143/00C10M145/14C10N20/00C10N20/02C10N20/04C10N30/02C10N30/08C10N40/00C10N40/04C10N40/08
CPCC10M157/00C10M2209/084C10N2030/02C10N2020/04C10N2040/08C10N2040/14C10N2040/04C10M2205/00C10M2205/022C10M2203/1025C10N2020/02C10N2040/042C10M143/00C10M145/14C10M157/10C10M169/041
Inventor 田村和志
Owner IDEMITSU KOSAN CO LTD