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Antifoam and lubricating oil composition

A defoamer and polymer technology, applied in lubricating compositions, additives, petroleum industry, etc., can solve the problems of reduced lubricating performance and cooling efficiency, accelerated deterioration of lubricating oil, poor oil pressure control, etc.

Active Publication Date: 2022-03-15
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 the following occur: Poor oil pressure control due to air bubbles mixed into the hydraulic flow path ; Lubricating performance and cooling efficiency decrease due to foaming; Wear and sintering occur due to oil film breakdown at friction parts;

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

Embodiment

[0142] Hereinafter, based on an Example and a comparative example, this invention is demonstrated more concretely. However, the following examples are intended to illustrate the present invention and are not intended to limit the present invention.

[0143]

[0144] (Determination of molecular weight and molecular weight distribution)

[0145] In the following production examples and examples, with regard to the molecular weight and molecular weight distribution, a GPC device (manufactured by TOSOH Co. HLC-8220), using tetrahydrofuran as the mobile phase, using a differential refractometer (RI) as the detector, under the conditions of measurement temperature 40°C, flow rate 0.35mL / min, sample concentration 1% by mass, and sample injection volume 5μL In this case, polystyrene was used as a standard substance for measurement.

manufacture example 1

[0147]Comb polymer antifoaming agent A according to the first aspect of the present invention is produced in the following procedure.

[0148] KF2012 (methacrylate modified Polydimethylsiloxane, manufactured by Shin-Etsu Chemical Co., Ltd., 30 parts by mass of functional group equivalent (4,600 g / mol) and 0.060 parts by mass of dodecyl mercaptan, made a homogeneous mixture under stirring, and then reacted with a diaphragm pump The system was vacuum degassed and nitrogen purged 5 times. Under nitrogen flow, 0.45 parts by mass of MAIB (dimethyl-2,2'-azobisisobutyrate, an azo-based initiator produced by Otsuka Chemical Co., Ltd.) as a radical polymerization initiator was injected from the sample inlet, Thereafter, under a nitrogen atmosphere, the mixture was stirred at a polymerization temperature of 70° C. for 8 hours to carry out a polymerization reaction to obtain a comb-shaped polymer defoamer A. As a result of GPC analysis (standard substance: polystyrene), the obtained co...

manufacture example 2～9

[0150] Except that the addition amount of KF2012, dodecyl mercaptan, and TDF-OMA (1H,1H,2H,2H-perfluorooctyl methacrylate) was changed to the amount described in Table 1 below, it was the same as Production Example 1 The comb-shaped polymer antifoaming agents B to I according to the first aspect of the present invention were manufactured.

[0151] [Table 1]

[0152]

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Abstract

An antifoaming agent containing a polymer comprising a repeating unit represented by the following general formula (1). (In general formula (1), X 1 is a repeating unit obtained by polymerization of ethylenically unsaturated groups; Y 1 It is a side chain having a linear or branched polysiloxane structure with a degree of polymerization of 5 to 300 comprising repeating units represented by the following general formula (2); Z 1 for the repeating unit X 1 and side chain Y 1 Attached linking group. ) (in general formula (2), R 1 and R 2 Each independently represents an organic group having 1 to 18 carbon atoms. )

Description

[0001] This application is a divisional application of a patent application with the same name filed on August 19, 2016 and with application number 201680046192.7. technical field [0002] The present invention relates to an antifoaming agent and a lubricating oil composition containing the antifoaming agent. Background technique [0003] 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 foaming is an issue in the lubricating oil. [0004] 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, prob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/04C10M169/04C10N40/04C10N40/25C10N30/18
CPCB01D19/0409C10M169/041C10M2203/10C10M2229/048C10M2229/052C10M2229/053B01D19/04C10M145/14C10M147/00C10M155/02C08F299/08C10M169/04C08L55/00C08F290/068C10M159/005C10M2209/084C10M2229/02C10N2020/04C10N2030/18C10N2030/68C10N2040/04C10N2040/25C08F220/24C10M159/12C10M2229/051C10N2040/10
Inventor 高木彰松木伸悟
Owner JXTJ NIPPON OIL & ENERGY CORP