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Lubricating oil composition, method for defoaming lubricating oil, and defoaming agent composition

A technology of lubricating oil composition and defoaming agent, which is applied in the direction of lubricating composition, chemical instrument and method, separation method, etc. It can solve problems such as increased foaming, oil film rupture, poor oil pressure control, etc., and achieves inhibition of separation and sedimentation , The effect of suppressing the decline of defoaming performance

Active Publication Date: 2021-03-02
JXTJ NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During continuous high-load operation or high-speed driving, foaming in the engine oil, transmission oil, or axle unit oil increases, and as a result, problems such as: Poor oil pressure control occurs due to air bubbles being mixed into the oil pressure flow path; Lubricating performance and cooling efficiency decrease due to foaming; wear and sintering occur due to oil film breakage at friction parts; deterioration of lubricating oil accelerates due to increase in oil temperature

Method used

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  • Lubricating oil composition, method for defoaming lubricating oil, and defoaming agent composition
  • Lubricating oil composition, method for defoaming lubricating oil, and defoaming agent composition
  • Lubricating oil composition, method for defoaming lubricating oil, and defoaming agent composition

Examples

Experimental program
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Effect test

manufacture example 1～3

[0214] (Measurement of average particle diameter of defoamer (A1))

[0215] In the following production examples, regarding the average particle diameter of the defoaming agent (A1), the dynamic light scattering method measuring device Photal ELSZ-0 (manufactured by Otsuka Electronics Co., Ltd.) was used to dilute the dispersion polymerization liquid with mineral oil. The sample (25° C.) was measured, and based on the measured result, it was calculated by cumulative analysis.

manufacture example 1

[0217] Antifoaming agent A corresponding to the first antifoaming agent (A1) was produced by dispersion polymerization in the following procedure.

[0218] Mineral oil (40° C. Kinematic viscosity when: 8.9mm 2 / s) 30 parts by mass, 3 parts by mass of KF2012 (methacrylate modified polydimethylsiloxane, produced by Shin-Etsu Chemical Industry Co., Ltd., functional group equivalent of 4,600 g / mol) as a defoamer monomer, and ethylene glycol 0.15 parts by mass of alcohol dimethacrylate and 1.5 parts by mass of polyalkylmethacrylate (weight-average molecular weight Mw=320,000) as a polymer dispersant were prepared into a homogeneous solution under stirring, and then a diaphragm pump was used to implement 5 parts by mass. Vacuum degassing and nitrogen purging of the secondary reaction system. Under nitrogen flow, PEROCTA O (1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate: 1,1,3,3-tetramethylbutyl peroxy- 2-Ethylhexanoate, peroxide-based radical polymerization initiator, produced ...

manufacture example 2

[0220] Change the defoamer monomer to X22-2426 (methacrylate modified polydimethylsiloxane, produced by Shin-Etsu Chemical Co., Ltd., functional group equivalent 12,000g / mol) 3 parts by mass and ethylene glycol dimethyl Except having changed the quantity of a polymer dispersing agent into 0.06 mass part 0.15 mass parts of acrylates, it carried out similarly to manufacture example 1, and produced the defoamer B equivalent to the 1st defoamer (A1) by dispersion polymerization. The obtained antifoaming agent polymer had an average particle diameter of 0.5 μm.

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Abstract

The lubricating oil composition of the present invention comprises: a lubricating oil base oil; (A) (b) more than one antifoaming agent monomer in (c) a polymer soluble in a polymerization solvent in (a) a polymerization solvent a first antifoaming agent obtained by polymerization under coexistence; and (B) a second antifoaming agent which is a silicone-based antifoaming agent.

Description

technical field [0001] The invention relates to a lubricating oil composition, a method for defoaming lubricating oil, and a defoaming agent composition. Background technique [0002] Lubricating oil is used in various mechanical devices to improve the lubricity between parts. Here, if the foaming of the lubricating oil worsens, it may lead to poor lubrication, poor oil pressure control, and a decrease in cooling efficiency. Therefore, suppressing the foaming is an issue borne by the lubricating oil. [0003] For example, in automobile engines, transmissions, and axle units, the load on lubricating oil has increased with recent improvements in performance and fuel consumption. During continuous high-load operation or high-speed driving, foaming in the engine oil, transmission oil, or axle unit oil increases, and as a result, problems such as: Poor oil pressure control occurs due to air bubbles being mixed into the oil pressure flow path; Lubricating performance and cooling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M155/02B01D19/04C10M157/10C10M145/14C10N40/25C10N40/30C10N20/04C10N30/18C10N40/00C10N40/04C10N40/08C10N40/12
CPCC10M145/14C10M157/10C10M159/005C10M2209/084C10M2229/02C10M2229/041C10M2229/048C10M155/02B01D19/0409C10N2020/04C10N2020/06C10N2030/18C10N2040/04C10N2070/00B01D19/04C10N2040/08C10N2040/25C10M169/041
Inventor 高木彰辰巳刚
Owner JXTJ NIPPON OIL & ENERGY CORP