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Lubricating oil composition for bearings

A technology of lubricating oil and composition for bearings, applied in the direction of lubricating composition, bearing components, shafts and bearings, etc., can solve problems such as easy volatilization, high friction loss of equipment, increased evaporation loss of lubricating oil, etc., and achieve viscosity index High, low evaporation loss effect

Inactive Publication Date: 2013-02-27
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In addition, when the conventional ester-based lubricating oils containing viscosity index improvers described in Patent Documents 2 to 5 are used, there is a problem that the lubricating oil has a high viscosity, so the friction loss of the equipment becomes high; When lubricating oils described in Patent Documents 6 and 7 are used as lubricating oil base oils, the effect of improving the viscosity index is low, and in high-temperature environments, low-molecular components contained in polyα-olefins and mineral oils are easy to volatilize, so lubricating oils The problem of increased evaporation loss

Method used

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  • Lubricating oil composition for bearings
  • Lubricating oil composition for bearings
  • Lubricating oil composition for bearings

Examples

Experimental program
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Effect test

manufacture example 1

[0135] Manufacture of diester (A1-1)

[0136] 255.0 parts of neopentyl glycol, 701.3 parts of heptanoic acid, and 48 parts of xylene were charged into a reaction vessel equipped with a stirring device, a thermometer, a nitrogen inlet tube, and a water fractionation receiver with a condenser tube, under a nitrogen environment , heated up to 200°C. The esterification reaction was carried out for about 10 hours while removing the distilled generated water with a water fractionation receiver to target the theoretical amount of generated water (88 g). After completion of the reaction, excess acid and xylene were removed by distillation to obtain a crude product of esterification. Next, the obtained esterified crude product was transferred to an eggplant-shaped flask equipped with a Vigreux fractionator, and distillation was performed at 220° C. under reduced pressure. 15% by volume of the initial fraction and the final fraction were removed by vacuum distillation, and the middle ...

manufacture example 2

[0138] Manufacture of diesters (A1-2)

[0139] Except that the feeding was changed to 277.5 parts of 3-methyl-1,5-pentanediol, 672.6 parts of heptanoic acid, and 48 parts of xylene, it was carried out in the same manner as in Production Example 1 to obtain the diester (A1 -2): 3-methyl-1,5-pentanediol di-n-heptanoate (molecular weight 342). (A1-2) had a total acid value of 0.01 mgKOH / g.

manufacture example 3

[0141] Manufacture of diesters (A1-3)

[0142] Except that the feeding was changed to 255.1 parts of 3-methyl-1,5-pentanediol, 684.9 parts of octanoic acid, and 47 parts of toluene, it was carried out in the same manner as in Production Example 1 to obtain the diester (A1-3 ): 3-methyl-1,5-pentanediol di-n-octanoate (molecular weight 371). (A1-3) had a total acid value of 0.01 mgKOH / g.

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Abstract

Provided is a lubricating oil composition for bearings which has a lower viscosity in low-temperature environments compared to that of existing lubricating oils, and qualities equivalent to those of existing lubricating oils in high-temperature environments in terms of minimizing leakage, burning, and evaporation loss. This invention is a lubricating oil composition for bearings (K) that contains a diester (A) and a poly(meth)acrylate viscosity-enhancing agent (B), the diester (A) having a molecular weight of 250 to 600 and comprising at least one type of diester selected from a group consisting of diesters (A1) represented by formula (1), diesters (A2) represented by formula (2), and diesters (A3) represented by formula (3). Specifically, the combined mass of (A) and (B) constitute at least 81% of the mass of the lubricating oil composition for bearings.

Description

technical field [0001] The present invention relates to lubricating oil compositions for bearings. More specifically, it relates to a lubricating oil composition for bearings having a low viscosity and a high viscosity index in a wide temperature range. Background technique [0002] From the standpoint of increasing processing speed, high-speed rotation is increasingly required for spindle motors used in hard disk drives and the like. The performance (mainly rotational torque) of bearings at high-speed rotation largely depends on the viscosity of lubricating oil used, and in order to reduce the rotational torque at high-speed rotation, low-viscosity diesters have been proposed (for example, Patent Document 1). [0003] In addition, for the places where the above-mentioned equipment is used, due to the gradual popularization of the equipment, the use in harsh environments is gradually increasing. Tolerates use from cold regions to hot weather. Therefore, lubricating oils f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04F16C33/10C10M105/36C10M105/38C10M105/72C10M145/14C10N20/02C10N20/04C10N30/02C10N30/08C10N40/02F16C33/66
CPCC10M2219/085F16C33/109C10M2209/1095F16C33/6688C10M2207/2835C10M2209/084C10N2230/02C10M2219/081C10M169/041C10M2207/2825C10N2240/02C10N2030/02C10N2040/02
Inventor 杉山义光松原大树
Owner SANYO CHEM IND LTD
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