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Antifoaming agent and lubricant composition

A defoamer and polymer technology, which is applied in lubricating compositions, additives, petroleum industry, etc., can solve problems such as increased foaming, accelerated deterioration of lubricating oil, poor oil pressure control, etc.

Active Publication Date: 2019-09-27
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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  • Antifoaming agent and lubricant composition
  • Antifoaming agent and lubricant composition
  • Antifoaming agent and lubricant composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0324] Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following examples show examples of the present invention and are not intended to limit the present invention.

[0325]

[0326] (Determination of molecular weight and molecular weight distribution)

[0327] In the following manufacturing examples and examples, with regard to molecular weight and molecular weight distribution, a GPC device (HLC manufactured by TOSOH CORPORATION) connected in series with 3 columns (TSKgel Super MultiPore HZ-M manufactured by TOSOH CORPORATION, inner diameter 4.6mm×15cm) -8220), using tetrahydrofuran as the mobile phase and differential refractometer (RI) as the detector, under the conditions of measuring temperature 40°C, flow rate 0.35mL / min, sample concentration 1% by mass, and sample injection volume 5μL , Use polystyrene as the standard material for determination.

manufacture example 1

[0329] According to the following steps, the antifoaming agent A according to the first aspect of the present invention is manufactured.

[0330] Into a 500 mL four-neck flask equipped with a PTFE stirring blade (with a vacuum seal), a Dimro reflux condenser, a three-way stopcock for nitrogen introduction, and a sample introduction port, methyl isobutyl ketone (polymerization Solvent) 200 parts by mass, and 5 parts by mass of polysiloxane macromonomer represented by the following general formula (25) (manufactured by Shin-Etsu Chemical Co., Ltd., weight average molecular weight 43,000, polydispersity index (Mw / Mn) 1.50) 95 parts by mass of lauryl methacrylate and 95 parts by mass of lauryl methacrylate were made into a homogeneous mixture under stirring, and then vacuum degassing and nitrogen replacement of the reaction system were performed 5 times using a diaphragm pump. Under nitrogen flow, introduce MAIB (dimethyl 2,2'-azobisisobutyrate: dimethyl 2,2'-azobisisobutyrate, azo r...

manufacture example 2

[0333] According to the following steps, the defoamer B according to the first aspect of the present invention is manufactured.

[0334] Into a 500 mL four-neck flask equipped with a PTFE stirring blade (with a vacuum seal), a Dimro reflux condenser, a three-way stopcock for nitrogen introduction, and a sample introduction port, methyl isobutyl ketone (polymerization Solvent) 200 parts by mass, and 20 parts by mass of polysiloxane macromonomer represented by the following general formula (25) (manufactured by Shin-Etsu Chemical Co., Ltd., weight average molecular weight 43,000, polydispersity index (Mw / Mn) 1.50) 80 parts by mass of lauryl methacrylate and 80 parts by mass of lauryl methacrylate were made into a homogeneous mixture under stirring, and then vacuum degassing and nitrogen replacement of the reaction system were performed 5 times using a diaphragm pump. Under nitrogen flow, introduce MAIB (dimethyl 2,2'-azobisisobutyrate: dimethyl 2,2'-azobisisobutyrate, azo radical p...

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Abstract

Provided is an antifoaming agent which contains a polymer having: at least one first polymer chain containing a polysiloxane structure represented by general formula (1); and at least one second polymer chain which is bonded to the first polymer chain and contains a repeating unit represented by general formula (2). (In formula (1), the order of the repeating units is arbitrary; R1 and R2 are each independently a C1-18 organic group that does not contain a fluorine atom; at least one among R3 and R4 is an organic group containing three or more fluorine atoms; m is 1 or greater; and n+m is 5-2000.) (In formula (2), X1 is a repeating unit obtained by polymerization of ethylenically unsaturated groups; Y1 is a C1-40 substituted or unsubstituted hydrocarbyl group; and Z1 is a linking group that links X1 and Y2.)

Description

Technical field [0001] The present invention relates to a defoamer and a lubricating oil composition containing the defoamer. Background technique [0002] In various mechanical devices, lubricating oil is used to improve the lubricity between parts. Here, if the bubbling of the lubricating oil deteriorates, it may cause poor lubrication, poor oil pressure control, and a decrease in cooling efficiency. Therefore, suppressing bubbling becomes a problem for the lubricating oil. [0003] For example, in automobile engines, transmissions, and axle units, the load on lubricating oil has increased due to higher performance and lower fuel consumption in recent years. During continuous high-load operation or high-speed driving, foaming in the engine oil, transmission oil, or axle unit oil increases. As a result, the following problems occur: due to air bubbles being mixed into the oil pressure flow path, poor oil pressure control occurs; Due to foaming, the lubricating performance and co...

Claims

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Application Information

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IPC IPC(8): B01D19/04C08F230/08C08F290/06C10M145/14C10M155/02C10M169/04
CPCB01D19/04C08F230/08C08F290/06C10M145/14C10M155/02C10M169/04B01D19/0409B01D19/0427C08G77/442C10M169/041C10M2203/003C10M2229/048C10N2020/04C10N2030/18C10N2040/04C10N2040/25
Inventor 辰巳刚高木彰
Owner JXTJ NIPPON OIL & ENERGY CORP
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