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Defoaming agent and lubricating oil composition

A technology of lubricating oil composition and defoamer, which is applied in the direction of lubricating composition, additives, petroleum industry, etc., can solve problems such as increased foaming, oil film rupture, poor oil pressure control, etc., and achieves suppression of defoaming performance decline and maintenance The effect of defoaming performance

Active Publication Date: 2020-06-16
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 breakage at friction parts; and Deterioration of lubricating oil is accelerated due to increased oil temperature

Method used

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  • Defoaming agent and lubricating oil composition
  • Defoaming agent and lubricating oil composition
  • Defoaming agent and lubricating oil composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0151] Hereinafter, based on an Example and a comparative example, this invention is demonstrated more concretely. In addition, the following examples are illustrations which show this invention, and do not limit this invention.

[0152]

[0153] (Determination of molecular weight and molecular weight distribution)

[0154] In the following production examples and examples, the molecular weight and molecular weight distribution were connected in series with a GPC device (HLC-8220 produced by TOSOH) (TSKgel Super MultiPore HZ-M produced by TOSOH, with an inner diameter of 4.6mm×15cm). ), using tetrahydrofuran as the mobile phase, using a differential refractometer (RI) as a detector, under the conditions of a measurement temperature of 40°C, a flow rate of 0.35mL / min, a sample concentration of 1% by mass, and a sample injection volume of 5μL, poly Styrene was used as a standard substance for determination.

[0155] (Measurement of average particle diameter of defoamer)

[01...

manufacture example 1

[0158] Comb polymer antifoaming agent A according to the first aspect of the present invention is manufactured through the following procedure.

[0159] KF2012 (methacrylate modified Polydimethylsiloxane, manufactured by Shin-Etsu Chemical Co., Ltd., functional group equivalent 4,600 g / mol) (9.75 parts by mass), octadecyl methacrylate (0.25 parts by mass), and dodecyl mercaptan (0.01 parts by mass), after making a homogeneous mixture under stirring, utilize 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-ethyl Caproic acid ester, peroxide-based radical polymerization initiator, NOF Co., Ltd.) 0.1 parts by mass was introduced from the sample inlet, and stirred for 8 hours under a nitrogen atmosphere at a polymerization temperature of 70°C to perform a polymerization reaction to obtain a comb-shaped Polymer defo...

manufacture example 2～6

[0161] Comb polymer antifoaming agents B to F according to the first aspect of the present invention were produced in the same manner as in Production Example 1 except that the monomers and polymerization initiators were changed as shown in Table 1 below.

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PUM

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Abstract

A defoaming agent comprising: a polymer comprising a repeating unit represented by the following general formula (1) and a repeating unit represented by the following general formula (3) and having aweight average molecular weight of 100000 to 1000000: wherein in the general formula (1), X1 is a repeating unit obtainable by polymerization of an ethylenic unsaturated group, Y1 is a side chain including a linear or branched polysiloxane structure, the polysiloxane structure having a polymerization degree of 5 to 300, and Z1 is a linking group linking the repeating unit X1 and the side chain Y1;in the general formula (3), X2 is a repeating unit obtainable by polymerization of an ethylenic unsaturated group, Y2 is a C1-30 hydrocarbyl side chain; and Z2 is a linking group linking the repeating unit X2 and the side chain Y2.

Description

[0001] This case is filed on August 19, 2016 , the application number is 201680046479.X (PCT / JP2016 / 074297) , the divisional application of the patent application with the title of invention "defoamer and lubricating oil composition". 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 the foaming becomes a technical problem 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...

Claims

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Application Information

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