WO2025075100A1 - Huile réfrigérante, composition de fluide de travail et procédé de réduction du coefficient de frottement d'une partie coulissante - Google Patents

Huile réfrigérante, composition de fluide de travail et procédé de réduction du coefficient de frottement d'une partie coulissante Download PDF

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Publication number
WO2025075100A1
WO2025075100A1 PCT/JP2024/035478 JP2024035478W WO2025075100A1 WO 2025075100 A1 WO2025075100 A1 WO 2025075100A1 JP 2024035478 W JP2024035478 W JP 2024035478W WO 2025075100 A1 WO2025075100 A1 WO 2025075100A1
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alkylbenzene
oil
mass
hydrocarbon
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Japanese (ja)
Inventor
文之 奈良
諒 安東
英俊 尾形
祐也 水谷
智宏 ▲高▼木
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Eneos Corp
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Eneos Corp
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/02—Well-defined hydrocarbons
    • C10M105/06—Well-defined hydrocarbons aromatic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/30—Refrigerators lubricants or compressors lubricants

Definitions

  • This disclosure relates to refrigeration oils, working fluid compositions, and methods for reducing the coefficient of friction of sliding parts.
  • Refrigeration units such as freezers, refrigerators, air conditioners (car air conditioners, room air conditioners, etc.), and water heaters are equipped with compressors to circulate refrigerant through the refrigeration cycle.
  • the compressors are filled with refrigeration oil to lubricate the sliding parts.
  • Patent Document 1 discloses a lubricant composition for use in a refrigerator operating with a refrigerant consisting of at least one component of the HC (hydrocarbon) group, the lubricant composition containing an alkylbenzene oil containing at least 90% by weight of linear alkylbenzene selected from the linear alkyl group having a paraffinic side chain of 10 to 13 carbon atoms, having an average molecular weight of 239 to 244 g/Mol, and having a viscosity of between 4.0 cSt and 5.0 cSt at a temperature of 40°C.
  • HC hydrocarbon
  • refrigeration oils containing alkylbenzenes as disclosed in Patent Document 1 do not necessarily have sufficiently low friction properties, and there is room for improvement.
  • one aspect of the present invention aims to effectively reduce the coefficient of friction of sliding parts by using refrigeration oil containing alkylbenzene.
  • the inventors have investigated a method of reducing the coefficient of friction of sliding parts by mixing alkylbenzene with a hydrocarbon oil other than alkylbenzene, and have found that by mixing a hydrocarbon oil having a specific refractive index, the coefficient of friction of sliding parts can be effectively reduced (additively or synergistically) compared to the case where alkylbenzene is used alone.
  • the present invention includes the following aspects.
  • the refractive index (n20) at 20 ° C. and the kinematic viscosity (KV100) at 100 ° C. of the hydrocarbon oil are expressed by the following formula: 1.420 ⁇ n20-0.002 ⁇ KV100 ⁇ 1.445
  • the refrigeration oil according to [1] which satisfies the above.
  • the refrigeration oil according to [1] or [2], wherein the kinetic viscosity of the refrigeration oil at 40° C. is 5 mm 2 /s or less.
  • a working fluid composition comprising the refrigerating machine oil according to any one of [1] to [3] and a refrigerant.
  • a method for reducing the coefficient of friction of a sliding part by using a refrigeration oil containing an alkylbenzene comprising mixing a hydrocarbon oil other than an alkylbenzene, the hydrocarbon oil having a refractive index at 20°C of 1.445 or less, with the alkylbenzene, to reduce the coefficient of friction of the sliding part.
  • the coefficient of friction of sliding parts can be effectively reduced by using refrigeration oil containing alkylbenzene.
  • One embodiment of the present invention is a refrigeration oil that contains an alkylbenzene and a hydrocarbon oil other than an alkylbenzene, the hydrocarbon oil having a refractive index of 1.445 or less at 20°C (hereinafter, simply referred to as "hydrocarbon oil").
  • the alkylbenzene may be a linear alkylbenzene or a branched alkylbenzene.
  • a linear alkylbenzene is an alkylbenzene in which a linear alkylating agent is bonded to the benzene ring.
  • the linear alkyl group may be bonded to the benzene ring at any position of the alkyl group.
  • a branched alkylbenzene is an alkylbenzene in which a branched alkylating agent is bonded to the benzene ring.
  • the branched alkyl group may be bonded to the benzene ring at any position of the alkyl group.
  • the alkylbenzene is preferably a linear alkylbenzene from the viewpoint of making the refrigeration oil have a low viscosity and of easily obtaining a friction coefficient reducing effect by blending a hydrocarbon oil other than alkylbenzene.
  • the linear alkylbenzene may be a compound represented by the following formula (1).
  • the alkylbenzene may be a mixture of two or more types of linear alkylbenzenes represented by formula (1).
  • the total content of the two or more types of linear alkylbenzenes is preferably 40% by mass or more, 50% by mass or more, 60% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more based on the total amount of alkylbenzene.
  • the average molecular weight of the alkylbenzene (preferably linear alkylbenzene) may be 180 or more, 200 or more, or 230 or more, and may be 280 or less, 260 or less, or 250 or less.
  • the kinetic viscosity of the alkylbenzene (preferably linear alkylbenzene) at 40°C may be 10 mm2 /s or less, 5 mm2 /s or less, 4.8 mm2 /s or less, 4.6 mm2 /s or less, or 4.5 mm2 /s or less, or 1 mm2 /s or more, 2 mm2 /s or more, 3 mm2 /s or more, or 4 mm2 /s or more.
  • the kinetic viscosity of the alkylbenzene (preferably linear alkylbenzene) at 100°C may be 0.5 mm2 /s or more, 1 mm2 /s or more, 1.2 mm2 /s or more, or 1.3 mm2 /s or more, and 4 mm2 /s or less, 3 mm2 /s or less, 2 mm2 /s or less, 1.8 mm2 /s or less, 1.7 mm2 /s or less, or 1.6 mm2 /s or less.
  • the kinetic viscosity in this specification means a kinetic viscosity measured in accordance with JIS K2283:2000.
  • the refractive index of the alkylbenzene (preferably linear alkylbenzene) at 20°C may be 1.470 or more, or 1.480 or more, and may be 1.500 or less, 1.495 or less, or 1.490 or less.
  • the refractive index refers to the refractive index measured in accordance with JIS K0062:1992.
  • the content of alkylbenzene may be 10% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more based on the total amount of the refrigerating machine oil, and may be 90% by mass or less, less than 90% by mass, 85% by mass or less, 80% by mass or less, 70% by mass or less, or 60% by mass or less.
  • alkylbenzene can be produced by contacting an aromatic compound with an alkylating agent in the presence of a catalyst.
  • aromatic compounds that can be used as raw materials include benzene, toluene, xylene, ethylbenzene, methylethylbenzene, diethylbenzene, and mixtures thereof.
  • Straight-chain alkylating agents for obtaining linear alkylbenzene include linear paraffin or olefin compounds having 8 to 40 carbon atoms, such as linear paraffin separated from petroleum fractions such as kerosene and diesel, linear olefins obtained by olefinating linear paraffin with a catalyst, and linear olefins obtained by polymerizing ethylene.
  • Branched alkylating agents for obtaining branched alkylbenzene include branched olefins having 6 to 40 carbon atoms obtained by polymerization of lower monoolefins such as ethylene, propylene, butene, and isobutylene; branched olefins having 6 to 40 carbon atoms obtained by thermal decomposition of wax, heavy oil, petroleum fractions, polyethylene, polypropylene, and mixtures thereof, and preferably propylene oligomers.
  • the alkylation catalyst used in the alkylation process may be any of the known catalysts, such as Friedel-Crafts catalysts, such as aluminum chloride and zinc chloride; and acid catalysts, such as sulfuric acid, phosphoric acid, tungstosilicic acid, hydrofluoric acid, and activated clay.
  • Friedel-Crafts catalysts such as aluminum chloride and zinc chloride
  • acid catalysts such as sulfuric acid, phosphoric acid, tungstosilicic acid, hydrofluoric acid, and activated clay.
  • linear alkylbenzene represented by formula (1) When using linear alkylbenzene represented by formula (1), it may be separated from the alkylated aromatic compound obtained as described above and used, and it is preferable to produce it by directly alkylating benzene using linear olefins such as linear paraffin, linear chlorinated paraffin, and ⁇ -olefin as the alkylating agent.
  • linear olefins such as linear paraffin, linear chlorinated paraffin, and ⁇ -olefin as the alkylating agent.
  • Hydrocarbon oils other than alkylbenzenes have a refractive index of 1.445 or less at 20°C.
  • the hydrocarbon oil has a lower refractive index than the alkylbenzenes, so the two can be distinguished based on the refractive index.
  • the refractive index of the hydrocarbon oil at 20°C may be preferably 1.444 or less or 1.443 or less, and more preferably 1.442 or less, 1.441 or less, 1.440 or less, or 1.439 or less.
  • the refractive index of the hydrocarbon oil at 20°C may be 1.420 or more, 1.425 or more, 1.430 or more, 1.432 or more, or 1.435 or more.
  • the hydrocarbon oil may be appropriately selected from those having the refractive index described above.
  • Examples of the hydrocarbon oil include mineral oil-based hydrocarbon oils and synthetic hydrocarbon oils.
  • the hydrocarbon oils may be used alone or in combination of two or more.
  • Mineral hydrocarbon oils include normal paraffinic, isoparaffinic, or naphthenic hydrocarbon oils (refined mineral oils) that are made from crude oil or its distillation residue and refined using an appropriate combination of conventional petroleum refining processes (solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, clay treatment, distillation, etc.).
  • Synthetic hydrocarbon oils include, for example, poly- ⁇ -olefins or hydrogenated products thereof, olefins such as ⁇ -olefins, isoparaffins, etc.
  • the synthetic hydrocarbon oil is preferably ⁇ -olefins or isoparaffins.
  • the number of carbon atoms of the olefin may be 12 or more, 13 or more, or 14 or more, and may be 30 or less, 25 or less, or 20 or less.
  • the olefin is preferably a straight-chain olefin such as an ⁇ -olefin.
  • the isoparaffin may be, for example, a component containing normal paraffin obtained by a dewaxing process in a petroleum refining process or a Fischer-Tropsch synthesis, or an isoparaffin obtained by refining a polymer of an olefin such as ethylene, propylene, butylene, or diisobutylene through an appropriate combination of hydrocracking, hydroisomerization, hydrodewaxing, hydrorefining, distillation, etc.
  • the hydrocarbon oil may preferably contain at least one type of hydrocarbon oil selected from the group consisting of normal paraffin-based, olefin-based, and isoparaffin-based oils, and more preferably may contain at least one type of hydrocarbon oil selected from the group consisting of linear olefin-based oils such as ⁇ -olefins, and isoparaffin-based oils.
  • the kinetic viscosity of the hydrocarbon oil at 40° C. may be 1 mm 2 /s or more, 1.5 mm 2 /s or more, or 2 mm 2 /s or more, and 5 mm 2 /s or less, 4 mm 2 /s or less, or 3 mm 2 /s or less.
  • the kinetic viscosity of the hydrocarbon oil at 100° C. may be 0.5 mm 2 /s or more, 0.7 mm 2 /s or more, or 0.9 mm 2 /s or more, and 2 mm 2 /s or less, 1.5 mm 2 /s or less, or 1.2 mm 2 /s or less.
  • the refractive index (n20) at 20° C. and the kinematic viscosity (KV100) at 100° C. of a hydrocarbon oil are calculated using the following formula: 1.420 ⁇ n20-0.002 ⁇ KV100 ⁇ 1.445
  • the value "n20-0.002 x KV100" in the center of the above formula will also be referred to as the N value.
  • the lower limit of the N value in the above formula may be 1.421, 1.422, 1.423, 1.424, 1.425, 1.426, or 1.427.
  • the upper limit of the N value in the above formula may be 1.444, 1.443, 1.442, 1.441, 1.440, 1.439, 1.438, or 1.437.
  • the % CA (percentage of aromatic carbon) of the hydrocarbon oil may be 5 or less, 3 or less, 2 or less, 1 or less, or 0.5 or less.
  • the % CN (percentage of naphthenic carbon) of the hydrocarbon oil may be 50 or less, 30 or less, 20 or less, less than 20, 15 or less, 10 or less, or 5 or less.
  • the % CP (percentage of paraffinic carbon) of the hydrocarbon oil may be 50 or more, 70 or more, 80 or more, 90 or more, or 95 or more, and may be 100 or less, 95 or less, or 80 or less.
  • the sum of % CA , % CN , and % CP is 100.
  • the RA (average number of aromatic rings per molecule) of the hydrocarbon oil may be 0.5 or less, 0.2 or less, 0.1 or less, or 0.05 or less, or may be 0.00 or more.
  • the RN (average number of naphthenic rings per molecule) of the hydrocarbon oil may be 0.8 or less, 0.5 or less, 0.2 or less, or 0.1 or less, or may be 0.00 or more.
  • %C A , %C N , %C P , RA , RN and RT refer to values calculated by a method conforming to ASTM D3238-17a (2017) "Standard Test Method for Calculation of Carbon Distribution and Structural Group Analysis of Petroleum Oils by the ndM Method".
  • ASTM D2502 or 2503 the average molecular weight of the hydrocarbon oil is less than 250, the value may not necessarily be reliable. Therefore, particularly when the average molecular weight of the hydrocarbon oil is less than 250, the molecular weight is experimentally determined based on the description in the "3.
  • the average molecular weight of the hydrocarbon oil is preferably 430 or less, 350 or less, 300 or less, 250 or less, less than 250, or 220 or less, and from the viewpoint of reducing volatility and maintaining the flash point, it is preferably 140 or more, 150 or more, 160 or more, or 180 or more.
  • any of the calculated values of %C P , %C A , and %C N is a negative value, the value is regarded as 0, and the remaining calculated values are corrected to a total of 100 while keeping the ratio as it is.
  • hydrocarbon oils, olefins or hydrocarbon oils containing olefins are not subject to the application of the test method, and the values may not necessarily be accurate, so that when the influence of olefins cannot be ignored, the values are used as reference values.
  • the content of the hydrocarbon oil may be 10% by mass or more, more than 10% by mass, 15% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more, based on the total amount of the refrigeration oil, and may be 90% by mass or less, 80% by mass or less, 70% by mass or less, or 60% by mass or less.
  • the total content of alkylbenzene and hydrocarbon oil may be 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass or more, based on the total amount of refrigeration oil, and may be 99% by mass or less.
  • one embodiment of the present invention is a method for reducing the friction coefficient of a sliding part using a refrigeration oil containing an alkylbenzene, and can also be said to be a method for reducing the friction coefficient of a sliding part by mixing a hydrocarbon oil other than an alkylbenzene, which has a refractive index of 1.445 or less at 20°C, with the alkylbenzene.
  • the sliding part is a sliding part in a refrigerator, and may be a sliding part in a compressor of the refrigerator.
  • the refrigeration oil may further contain an anti-wear agent (also called an extreme pressure agent) as an additive from the viewpoint of improving wear resistance.
  • an anti-wear agent include phosphorus-containing anti-wear agents.
  • the phosphorus-containing anti-wear agent include phosphate esters, thiophosphate esters, acid phosphate esters, amine salts of acid phosphate esters, chlorinated phosphate esters, phosphites, amine salts of phosphites, phosphonate esters, amine salts of phosphonate esters, etc.
  • the phosphorus-containing anti-wear agent is preferably one or more types selected from phosphate esters and thiophosphate esters.
  • phosphate esters include trialkyl phosphate, trialkenyl phosphate, and triaryl phosphate.
  • trialkyl phosphates include tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, triundecyl phosphate, tridodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, triheptadecyl phosphate, and trioctadecyl phosphate.
  • trialkenyl phosphates include trioleyl phosphate.
  • triaryl phosphates include triphenyl phosphate, tricresyl phosphate, tri(ethylphenyl) phosphate, tri(butylphenyl) phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, and xylenyl diphenyl phosphate.
  • the phosphoric acid ester is preferably a triaryl phosphate, more preferably selected from triphenyl phosphate and tricresyl phosphate, and even more preferably tricresyl phosphate.
  • Examples of thiophosphate esters include trialkyl phosphorothionate, trialkenyl phosphorothionate, and triaryl phosphorothionate.
  • Examples of trialkyl phosphorothionates include tributyl phosphorothionate, tripentyl phosphorothionate, trihexyl phosphorothionate, triheptyl phosphorothionate, trioctyl phosphorothionate, trinonyl phosphorothionate, tridecyl phosphorothionate, triundecyl phosphorothionate, tridodecyl phosphorothionate, tritridecyl phosphorothionate, tritetradecyl phosphorothionate, tripentadecyl phosphorothionate, trihexadecyl phosphorothionate, triheptadecyl phosphorothionate, and trioctadecyl phosphorothionate.
  • trialkenyl phosphorothionates include trioleyl phosphorothionate.
  • triaryl phosphorothionates include triphenyl phosphorothionate, tricresyl phosphorothionate, trixylenyl phosphorothionate, cresyl diphenyl phosphorothionate, and xylenyl diphenyl phosphorothionate.
  • the thiophosphate ester is preferably triphenyl phosphorothionate.
  • acid phosphate esters monobutyl acid phosphate, monopentyl acid phosphate, monohexyl acid phosphate, monoheptyl acid phosphate, monooctyl acid phosphate, monononyl acid phosphate, monodecyl acid phosphate, monoundecyl acid phosphate, monododecyl acid phosphate, monotridecyl acid phosphate, monotetradecyl acid phosphate, monopentadecyl acid phosphate, monohexadecyl acid phosphate, monoheptadecyl acid phosphate, monooctadecyl acid phosphate , monooleyl acid phosphate, dibutyl acid phosphate, dipentyl acid phosphate, dihexyl acid phosphate, diheptyl acid phosphate, dioctyl acid phosphate, dinonyl acid phosphate, didecyl acid phosphate,
  • Examples of phosphonate esters include dialkyl phosphonoacetic acid, dialkyl hydroxymethyl phosphonate, dialkyl hydroxyethyl phosphonate, dialkyl hydroxyundecyl phosphonate, etc.
  • the alkyl group in these phosphonate esters may be a linear or branched alkyl group having 1 to 20 carbon atoms.
  • the amines constituting the amine salts are exemplified by alkyl or alkenyl amines having 4 to 20 carbon atoms.
  • the kinetic viscosity of the refrigeration oil at 100°C may be 0.5 mm 2 /s or more, 0.8 mm 2 /s or more, or 1 mm 2 /s or more, and may be 10 mm 2 /s or less, 5 mm 2 /s or less, 3 mm 2 /s or less, 2 mm 2 /s or less, or 1.5 mm 2 /s or less.
  • the refractive index of the refrigeration oil at 20°C may be 1.445 or more, 1.450 or more, or 1.455 or more, and may be 1.480 or less, 1.470 or less, or 1.465 or less.
  • the coefficient of friction of the sliding parts tends to be lower than when a mineral oil-based refrigeration oil that has a refractive index in this range but does not contain alkylbenzene is used.
  • the pour point of the refrigeration oil may be 10°C or less, 0°C or less, -10°C or less, -20°C or less, -30°C or less, or -40°C or less.
  • pour point refers to the pour point measured in accordance with JIS K2269:1987.
  • refrigerants include hydrocarbons, saturated fluorohydrocarbons, unsaturated fluorohydrocarbons, fluorine-containing ethers such as perfluoroethers, bis(trifluoromethyl)sulfide, trifluoroiodomethane, ammonia, and carbon dioxide.
  • the hydrocarbon is preferably a hydrocarbon having 1 to 5 carbon atoms, more preferably a hydrocarbon having 2 to 4 carbon atoms.
  • Examples of the hydrocarbon include methane, ethylene, ethane, propylene, propane (R290), cyclopropane, normal butane, isobutane (R600a), cyclobutane, methylcyclopropane, 2-methylbutane, normal pentane, or a mixture of two or more of these.
  • the hydrocarbon is preferably a gaseous hydrocarbon at 25°C and 1 atmospheric pressure, more preferably propane, normal butane, isobutane, 2-methylbutane, or a mixture of these.
  • Hydrocarbon oil 3 Normal paraffinic hydrocarbon oil obtained by adsorption separation using a molecular sieve from a kerosene fraction obtained by hydrodesulfurizing an atmospheric distillate oil of crude oil, and fractional distillation (refractive index (20° C.): 1.429, kinetic viscosity at 40° C.: 2.09 mm 2 /s, kinetic viscosity at 100° C.: 0.97 mm 2 /s, N value: 1.427, average molecular weight: 201, % C P : 99.7, % C N : 0, % C A : 0.3, R N : 0.00, R A : 0.01, R T : 0.01).
  • Hydrocarbon oil 4 Mixture of 1-tetradecene (reagent) and 1-hexadecene (reagent) (mass ratio 50:50) (refractive index (20°C): 1.439, kinematic viscosity at 40°C: 2.21 mm 2 /s, kinematic viscosity at 100°C: 1.01 mm 2 /s, N value: 1.437, average molecular weight: 210, %C P , %C N , %C A , R A and R N : not applicable)
  • Hydrocarbon oil 5 isoparaffin obtained by hydrocracking/isomerizing/refining a paraffin component synthesized from carbon monoxide and hydrogen by the Fischer-Tropsch reaction, and then fractionally distilling it (refractive index (20° C.): 1.432, kinetic viscosity at 40° C.: 2.16 mm 2 /s, kinetic viscosity at 100° C.: 0.96 mm 2 /s,
  • the friction coefficient ( ⁇ ) was measured under the following conditions using an MTM (Mini Traction Machine) tester (manufactured by PCS Instruments). The results are shown in Tables 1 and 2. The smaller the friction coefficient, the more excellent the friction characteristics. Balls and disks: standard test pieces (AISI 52100 standard) Test temperature: 40°C Sliding speed: 0.3 to 0.9 m/s (partial excerpt) Load: 10N Slip rate: 30% The sliding velocity was calculated as

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Abstract

L'invention concerne une huile réfrigérante contenant un alkylbenzène et une huile hydrocarbonée autre que l'alkylbenzène qui a un indice de réfraction à 20 °C inférieur ou égal à 1,445.
PCT/JP2024/035478 2023-10-04 2024-10-03 Huile réfrigérante, composition de fluide de travail et procédé de réduction du coefficient de frottement d'une partie coulissante Pending WO2025075100A1 (fr)

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