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Antifoam and lubricating oil composition

A technology of lubricating oil composition and defoaming agent, which is applied in the direction of lubricating composition, additives, petroleum industry, etc., can solve the problems of foaming increase, oil film rupture, sintering, etc., and achieve the purpose of suppressing the decline of defoaming performance and maintaining defoaming performance effect

Active Publication Date: 2020-09-25
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; Decreased lubricating performance and cooling efficiency due to foaming; wear and sintering due to breakdown of the oil film at friction parts; and accelerated deterioration of lubricating oil due to increased oil temperature

Method used

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  • Antifoam and lubricating oil composition
  • Antifoam and lubricating oil composition
  • Antifoam and lubricating oil composition

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1～10

[0172] (Measurement of average particle size of defoamer)

[0173] In the following production examples, regarding the average particle diameter of the antifoaming agent obtained by dispersion polymerization, a 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 finished sample (25°C) was measured, and based on the measured results, it was calculated by cumulative analysis.

manufacture example 1

[0175] The defoamer A was produced by dispersion polymerization according to the following procedure.

[0176] Mineral oil (40° C. Kinematic viscosity when: 8.9mm 2 / s) 30 parts by mass, 1.5 parts by mass of polyalkylmethacrylate (weight-average molecular weight Mw=450,000) as a polymer dispersant, and KF2012 (methacrylate modified polydiacrylate) as a defoamer monomer Methylsiloxane; produced by Shin-Etsu Chemical Co., Ltd.; functional group equivalent 4,600g / mol) 3 parts by mass, made into a homogeneous solution under stirring, and then using a diaphragm pump to implement vacuum degassing and nitrogen purging of the reaction system 5 times. 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; manufactured by NOF Co., Ltd.) 0.15 parts by mass, and then, under a nitrogen atmosphere, stirred at a polymerization temperature of 70°C for 8 hours to car...

manufacture example 2～10

[0178] Except having changed the defoamer monomer, polymer dispersant, radical initiator and their usage amounts as shown in Table 1, the defoamers B to J were produced by dispersion polymerization in the same manner as in Production Example 1.

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Abstract

The present invention provides an antifoaming agent obtained by polymerizing (B) one or more antifoaming agent monomers in the presence of (C) a polymer soluble in a polymerization solvent in (A) a polymerization solvent.

Description

technical field [0001] The present invention relates to an antifoaming agent and a lubricating oil composition containing the antifoaming agent. 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; Lubrication performance and cooling efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/04C08F2/44C08F265/06C08F299/08C10M155/02C10M157/10C10N20/04C10N30/00C10N30/18C10N40/04C10N40/08C10N40/12C10N40/25C10N40/30
CPCC08F265/06C10M155/02C10M157/10C10M159/005C10M2209/084C10M2229/02C10M2229/048C08F230/08B01D19/0409C08F290/068C10N2020/04C10N2030/18C10N2040/04C10N2040/25C08F222/10C08F2/08C08F2/44C08F299/08B01D19/04
Inventor 高木彰辰巳刚
Owner JXTJ NIPPON OIL & ENERGY CORP