Grease composition and method for producing same

A technology of grease composition and mixture, which is applied to the grease composition of grease and its manufacturing field, can solve the problems of impaired heat resistance, difficulty in forming oil film, etc., and achieves excellent balance of low torque and heat resistance. Excellent oxidative stability

Pending Publication Date: 2021-10-29
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the low-temperature characteristics of grease, the viscosity of the base oil is usually reduced. However, when the viscosity of the base oil is reduced, the viscosity at high temperature is also reduced. Therefore, it is difficult to form an oil film at high temperature, and as a result, the heat resistance is impaired.
In order to simultaneously achieve low torque at low temperatures and oil film formation at high temperatures, research has been conducted on the use of synthetic oils (poly-α-olefins, ethylene-α-olefin copolymers) with excellent temperature-viscosity properties instead of conventionally used mineral oils , but there is still room for research (Patent Documents 1-3)

Method used

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  • Grease composition and method for producing same
  • Grease composition and method for producing same
  • Grease composition and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0304] As the lubricating base oil (A), synthetic oil-A was used, as the ethylene-α-olefin copolymer (B), the copolymer (polymer 1) obtained in Polymerization Example 1 was used, as the thickener (C), A grease composition was prepared by stirring at high temperature using lithium soap so that the total of these and the antioxidant would be 100% by mass. The respective addition amounts are shown in Table 2. Table 2 shows the physical properties of the grease composition.

[0305] In addition, a mixture containing Synthetic Oil-A as lubricating oil base oil (A) and Polymer 1 as ethylene-α-olefin copolymer (B) was prepared in the mass ratio (44.8:50.0) shown in Table 2, for For this mixture, the kinematic viscosity and viscosity index at 100°C and 40°C were measured. The results are shown in Table 2.

Embodiment 2～4、 comparative example 1～4

[0307] A grease composition was prepared in the same manner as in Example 1 except that the types and addition amounts of the components were changed as described in Table 2. Table 2 shows the physical properties and the like of the obtained grease composition.

[0308] In addition, a mixture comprising Synthetic Oil-A as lubricating oil base oil (A) and Polymer 1, 2, 3 or 4 as ethylene-α-olefin copolymer (B) was prepared in the mass ratio shown in Table 2, For this mixture, the kinematic viscosity and viscosity index at 100° C. and 40° C. were measured. The results are shown in Table 2.

[0309] [Table 2]

[0310]

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Abstract

To provide a grease composition which has extremely excellent oil film formability at high temperatures and extremely excellent low torque properties at low temperatures in a balanced manner, while having excellent stability of thermal oxidation resistance. A grease composition which contains 10-98% by mass of (A) a lubricant base oil that has a kinematic viscosity at 100 degC of 1-14 mm2 / s, a viscosity index of 100 or more and a pour point of 0 degC or less, 89-1% by mass of (B) a liquid random copolymer of ethylene and an alpha-olefin, said random copolymer being produced using a specific catalyst, and 1-30% by mass of (C) a thickening agent (with the total of (A), (B) and (C) being 100% by mass), and which is configured such that the lubricant base oil (A) and the copolymer (B) are blended at such a ratio at which a mixture of the lubricant base oil (A) and the ethylene-alpha-olefin copolymer (B) has a kinematic viscosity at 100 degC of 1-500 mm2 / s and a viscosity index of 120 or more.

Description

technical field [0001] The present invention relates to a grease composition and a method for producing the same. More specifically, the present invention relates to a grease composition suitable as a grease used for automobile parts and a method for producing the same. Background technique [0002] Since it is desired to reduce the size and weight of automobiles (passenger cars) and to increase the passenger space, the space in the engine room has to be reduced. Therefore, the size and weight of various components installed in the engine room are further developed. For electronically controlled engines of automobiles such as bearings for electronically controlled throttle valves, idle speed control valves (ISCV), and exhaust gas recirculation devices (EGR), the increase in speed due to the miniaturization of transmissions (gears) and bearings, and The increase in temperature due to the closed engine room becomes a problem. In addition, in order to reduce energy damage at s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M107/02C08F4/6592C10N50/10
CPCC10M2205/0225C10N2050/10C10M2205/0285C10M2207/1285C10M2207/026C10N2030/02C10N2030/10C10N2040/02C10N2040/04C10N2020/02C10N2020/04C08F210/16C08F210/06C08F4/65912C10M169/04C10M2205/022C10M2207/289C10N2020/011C10N2070/00C10N2020/065C10N2030/08C10M2205/0245C10N2010/02C08F2500/02C08F2500/03C08F2500/17C08F2500/27C08F4/65927C10M2205/024C10M2205/026C10M2205/028C10M143/00C10M101/02C10M105/32C10M107/02C10M171/02C08F4/6592C08F210/02C10M107/04C10M107/06C10M107/10C10M117/04C10M169/02
Inventor 阿部昌太
Owner MITSUI CHEM INC
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