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Defoaming agent and lubricating oil composition
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A defoamer, polymer technology, applied in lubricating compositions, additives, petroleum industry, etc., can solve the problems of increased foaming, oil film rupture, wear, etc., and achieve the effect of inhibiting the decline of defoaming performance and maintaining defoaming performance
Active Publication Date: 2018-06-08
JXTJ NIPPON OIL & ENERGY CORP
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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
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[0141] 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.
[0142]
[0143] (Determination of molecular weight and molecular weight distribution)
[0144] 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.
[0145] (Measurement of average particle diameter of defoamer)
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manufacture example 1
[0148] Comb polymer antifoaming agent A according to the first aspect of the present invention is manufactured through the following procedure.
[0149] 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-tetramethylbutylperoxy-2-ethylhexanoate: 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate as a radical polymerization initiator acid ester, peroxide radical polymerization initiator, manufactured by NOF Co., Ltd.) 0.1 parts by mass were introduced from the sample inlet, and stirred for 8 hours under a nitrogen atmosphere at a polymerization temperature of 70°C to perform a polymerizatio...
manufacture example 2～6
[0151] 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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Abstract
Provided is a defoaming agent that includes a polymer comprising a repeating unit represented by general formula (1) and a repeating unit represented by general formula (3). (In general formula (1), X1 is a repeating unit obtained by polymerizing an ethylenically unsaturated group, Y1 is a side chain having a linear or branched polysiloxane structure with a degree of polymerization of 5-300, and Z1 is a linking group linking the repeating unit X1 and the side chain Y1.) (In general formula (3), X2 is a repeating unit obtained by polymerizing an ethylenically unsaturated group, Y2 is a side chain comprising a C1-30 hydrocarbyl group, and Z2 is a linking group linking the repeating unit X2 and the side chain Y2.)
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 becomes a technical problem in 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 the following occur: Poor oil pressure control due to air bubbles mixed into the hydraulic flow path ; Lubrication performance and c...
Claims
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Application Information
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