EP3476924B1 - Graisse pour huile de machine frigorifique - Google Patents

Graisse pour huile de machine frigorifique Download PDF

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Publication number
EP3476924B1
EP3476924B1 EP18202619.5A EP18202619A EP3476924B1 EP 3476924 B1 EP3476924 B1 EP 3476924B1 EP 18202619 A EP18202619 A EP 18202619A EP 3476924 B1 EP3476924 B1 EP 3476924B1
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EP
European Patent Office
Prior art keywords
grease
refrigerating machine
machine oil
oil
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18202619.5A
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German (de)
English (en)
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EP3476924A1 (fr
Inventor
Norihisa Horaguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Classifications

    • 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
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/003—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022—Ethene
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/026—Butene
    • C10M2205/0265—Butene used as base material
    • 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
    • C10N2020/011—Cloud point
    • 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
    • C10N2020/017—Specific gravity or density
    • 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
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/04—Molecular weight; Molecular weight distribution
    • 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
    • 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
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Definitions

  • the present invention relates to a grease for a refrigerating machine oil.
  • a refrigerant circulates while repeatedly changing from a liquid to a gas and from a gas to a liquid.
  • a compressor for compressing the refrigerant is disposed in a circulation line through which the refrigerant circulates.
  • Patent Document 1 discloses a refrigerating compressor using at least one of an ester oil, an ether oil, and a carbonate oil as a refrigerating machine oil.
  • the refrigerating machine oil is easily dissolved in a refrigerant.
  • the refrigerant in which the refrigerating machine oil is dissolved is discharged from the compressor and circulates in the refrigerating cycle. At this time, a part of the refrigerating machine oil dissolved in the refrigerant precipitates and adheres to a pipe wall, a heat exchanger, or the like in the refrigeration cycle, so as to form an oil film. As a result, the thermal conductivity is decreased and the heat exchange capability is decreased in some cases.
  • WO 2017/098924 discloses an elevator rope grease, an elevator rope and a traction elevator.
  • EP 2716745 discloses a bearing grease.
  • the refrigerating machine oil may flow along with the flow of the refrigerant and may be discharged from the compressor together with the refrigerant.
  • the refrigerating machine oil adheres to the pipe wall, the heat exchanger, or the like in the refrigeration cycle so as to form an oil film, and thereby the heat exchange capacity is deteriorated.
  • an oil separator is provided on the discharge port side of the compressor and the refrigerant discharged from the compressor is separated from the refrigerating machine oil, the formation of the oil film on the pipe wall, the heat exchanger, or the like can be suppressed, but it causes a large refrigerating cycle.
  • the refrigerating machine oil is required to be hardly soluble in the refrigerant and hardly flow into the refrigerant.
  • the present invention provides a grease for a refrigerating machine oil which is hardly soluble in a refrigerant and hardly flows into the refrigerant.
  • a grease for a refrigerating machine oil includes a hydrocarbon oil and a resin having a melting point of 270°C or lower, in which an unworked penetration is 100 to 340 at 25°C.
  • a hydrocarbon oil which is a base oil and a resin having a melting point of 270°C or lower which is a thickener, in which an unworked penetration is 100 to 340 at 25°C, are included.
  • the grease for a refrigerating machine oil of this embodiment is hardly compatible with a refrigerant, and hardly flows into the refrigerant. Therefore, it is difficult for the refrigerating machine oil to be discharged from the compressor, and it is possible to prevent the refrigerating machine oil from adhering to a pipe wall, a heat exchanger, or the like in a refrigeration cycle so as to form an oil film. As a result, it is possible to maintain favorable thermal conductivity and to suppress the deterioration of the heat exchange capacity.
  • the compressor using the grease for a refrigerating machine oil of this embodiment is like an oil-less compressor since the grease for a refrigerating machine oil is hardly discharged.
  • the grease for a refrigerating machine oil of the invention is hardly soluble in a refrigerant and hardly flows into the refrigerant.
  • the grease for a refrigerating machine oil of this embodiment includes a hydrocarbon oil and a resin having a melting point of 270°C or lower (hereinafter, also referred to as "resin (A)").
  • the hydrocarbon oil serves as a base oil and assumes a liquid state at 25°C.
  • the grease for a refrigerating machine oil contains the hydrocarbon oil
  • the refrigerating machine oil becomes less soluble in refrigerant.
  • the grease for a refrigerating machine oil is excellent in lubricity.
  • the hydrocarbon oil is chain (acyclic) .
  • polymer (a) As the chain type hydrocarbon oil, a polymer having a unit represented by General Formula (1) (hereinafter, also referred to as "polymer (a)") is used. -(CH 2 -C(CH 3 ) 2 )- ... (1)
  • polymer (a) a copolymer of isobutylene homopolymer (that is, polyisobutylene), a monomer copolymerizable with isobutylene (hereinafter, also referred to as "monomer (x)") and isobutylene can be used. That is, the polymer (a) may further have a unit derived from the monomer (x).
  • Examples of the monomer (x) include ones other than isobutylene among the olefins exemplified as described above. Among them, 1-butene, 2-butene, and isoprene are preferable.
  • hydrocarbon oils may be used alone or two or more kinds thereof may be used in combination.
  • the kinematic viscosity of the hydrocarbon oil is 1,500 to 25,000 mm 2 /s at 40°C.
  • abrasion resistance of the grease for a refrigerating machine oil can be favorably maintained.
  • the kinematic viscosity of the hydrocarbon oil is 50,000 mm 2 /s or lower, an excessive rise in the stickiness (viscosity) of the grease for a refrigerating machine oil can be suppressed, and the function as a lubricating oil of the compressor can be sufficiently exhibited.
  • the kinematic viscosity of the hydrocarbon oil is measured at a measurement temperature of 40°C based on JIS K 2283.
  • a number average molecular weight of the hydrocarbon oil is 500 to 3,000.
  • the number average molecular weight of the hydrocarbon oil is measured according to a vapor pressure osmotic pressure method (VPO method).
  • the content of the hydrocarbon oil with respect to the total mass of the grease for a refrigerating machine oil is 93% to 96% by mass in a case where the kinematic viscosity is 20,000 mm 2 /s or higher at 40°C, is 90% to 95% by mass in a case where the kinematic viscosity is lower than 20,000 mm 2 /s at 40°C.
  • the content of the hydrocarbon oil is within the above range, appropriate viscosity can be exhibited.
  • the grease for a refrigerating machine oil is not excessively hardened, and can sufficiently exhibit a function as a lubricant of the compressor.
  • the grease for a refrigerating machine oil can maintained excellent slidability.
  • the content of the hydrocarbon oil is equal to or lower than the above upper limit value, the grease for a refrigerating machine oil is not excessively flexible, and does not easily flow with the refrigerant.
  • a resin (A) serves as a thickener.
  • the refrigerating machine oil contains the resin (A)
  • the refrigerating machine oil is difficult to be compatible with the refrigerant due to the interaction with the hydrocarbon oil and hardly flows into the refrigerant.
  • a moderate viscosity can be imparted to the grease for a refrigerating machine oil.
  • a melting point of the resin (A) is 270°C or lower, is preferably 200°C or lower, is more preferably 150°C or lower, and is still more preferably 120°C or lower.
  • the grease for a refrigerating machine oil is normally manufactured by melting the resin (A) after mixing the resin oil (A) with the hydrocarbon oil, or mixing the resin oil (A) with the hydrocarbon oil after melting the resin (A).
  • the melting point of the resin (A) is 270°C or lower, the hydrocarbon oil hardly deteriorates when the resin (A) is melted.
  • the lower limit of the melting point of the resin (A) is not particularly limited, but it is usually about 100°C.
  • the resin (A) is a polyethylene resin or a polypropylene resin and has excellent affinity with hydrocarbon oil and low oil separation degree.
  • These resins (A) may be used alone or two or more kinds thereof may be used in combination.
  • the content of the resin (A) with respect to the total content of the grease for a refrigerating machine oil is 4% to 7% by mass.
  • the content of the resin (A) with respect to the total content of the grease for a refrigerating machine oil is 5% to 10% by mass.
  • the content of the resin (A) is within the above range, appropriate viscosity can be exhibited in the grease.
  • the grease for a refrigerating machine oil is not excessively flexible, and does not easily flow with the refrigerant.
  • the grease for a refrigerating machine oil is not excessively hardened, and can sufficiently exhibit a function as a lubricant of the compressor.
  • the grease for a refrigerating machine oil can maintained excellent slidability.
  • the grease for a refrigerating machine oil of the present invention may be formed of the hydrocarbon oil and the resin (A), or may contain components (optional components) other than the hydrocarbon oil and the resin (A).
  • additives such as a lubricant, an antioxidant, an acid scavenger, and a metal deactivator can be mentioned.
  • the lubricant examples include a phosphate ester compound such as mono-m or p-toluyl-diphenyl phosphate, di-m or p-toluyl-monophenyl phosphate, tri-m or p-toluyl phosphate (tricresyl phosphate (TCP)), mono-m or p-toluyl-dixylenyl phosphate, di-m or p-toluyl-monoxylenyl phosphate, mono-m or p-toluyl-dixylenyl phosphate, di-m or p-toluyl-monoxylenyl phosphate, tris(m or p-tert-butyl phenyl)-phosphate, bis-(m or p-tert-butylphenyl)-mono-phenyl phosphate, mono-(m or p-tert-butylphenyl)-
  • These lubricants may be used alone or two or more kinds thereof may be used in combination.
  • antioxidants examples include phenolic antioxidants such as 2,6-di-tert-butyl hydroxytoluene (BHT), 4,4'-methylenebis (2,6-di-tert-butyl hydroxytoluene), 2,2'-methylenebis (4-methyl-6-tert-butyl phenol), 3,5-di-tert-butyl-4-hydroxy phenyl propionic acid 2-ethyl hexyl ester, 3-tert-butyl-4-hydroxy-5-methylphenyl propionic acid 2-ethyl hexyl ester, 3,5-di-tert-butyl-4-hydroxyphenyl propionic acid tridecyl ester, 3-tert-butyl-4-hydroxy-5-methyl phenyl propionic acid tridecyl ester, 3,5-di-tert-butyl-4-hydroxyphenyl propionic acid stearyl ester, 3-tert-butyl-4-hydroxy-5-methylphenyl prop
  • antioxidants may be used alone or two or more kinds thereof may be used in combination.
  • the acid scavenger examples include a glycidyl ester compound or a glycidyl ether compound (hereinafter, these are collectively referred to as "epoxy-based acid scavengers”) such as butyl glycidyl ether, butyric acid glycidyl ester, hexyl glycidyl ether, hexanoic acid glycidyl ester, 2-ethyl hexyl glycidyl ether, 2-ethyl hexanoic acid glycidyl ester, neopentyl glycidyl ether, pivalic acid glycidyl ester, decyl glycidyl ether, decanoic acid glycidyl ester, stearyl glycidyl ether, stearic acid glycidyl ester, oleyl glycidyl ether, o
  • These acid scavengers may be used alone or two or more kinds thereof may be used in combination.
  • the metal deactivator examples include a benzotriazole-based compound such as 1 H-benzotriazole, 4-methyl benzotriazole, 5-methyl benzotriazole, benzotriazole-1-methylamine,4-methyl benzotriazole-l-methylamine, 5-methyl benzotriazole-l-methylamine, N-methyl benzotriazole-l-methylamine, N-ethyl benzotriazole-l-methylamine, N,N-dimethyl benzotriazole-l-methylamine, N,N-diethyl benzotriazole-l-methylamine, N,N-dipropyl benzotriazole-l-methylamine, N,N-dibutyl benzotriazole-l-methylamine, N,N-dihexyl benzotriazole-1-methylamine, N,N-dioctyl benzotriazole-l-methylamine, N, N-bis(2-ethyl hexyl)-benzotriazole
  • These metal deactivators may be used alone or two or more kinds thereof may be used in combination.
  • the content of the optional components for the total mass of the grease for a refrigerating machine oil is preferably 10% by mass or less, and is more preferably 7% by mass or less. When the content of the optional components is 10% by mass or less, it hardly precipitates from the grease for a refrigerating machine oil.
  • the unworked penetration of the grease for a refrigerating machine oil at 25°C is 100 to 340.
  • the grease for a refrigerating machine oil is not excessively hardened, and can sufficiently exhibit a function as a lubricant of the compressor.
  • the grease for a refrigerating machine oil can maintained excellent slidability.
  • the unworked penetration of the grease for a refrigerating machine oil is 340 or lower, the grease for a refrigerating machine oil is not excessively flexible, and does not easily flow with the refrigerant.
  • the unworked penetration of the grease for a refrigerating machine oil is preferably 150 or higher, is more preferably 200 or higher, and is further preferably 250 or higher.
  • the unworked penetration of the grease for a refrigerating machine oil can be adjusted by the physical properties (particularly, the kinematic viscosity) of the hydrocarbon oil, or the content of the resin (A). Specifically, as the kinematic viscosity of the hydrocarbon oil becomes higher, the unworked penetration tends to be lower. In addition, as the content of the resin (A) is increased, the unworked penetration tends to be lower.
  • the unworked penetration of the grease for a refrigerating machine oil is measured at a measurement temperature of 25°C based on JIS K 2220.
  • the grease for a refrigerating machine oil can be manufactured, for example, as follows.
  • the hydrocarbon oil, the resin (A), and optionally optional components are mixed.
  • the mixture is heated to a temperature not lower than the melting point of the resin (A) so as to melt the resin (A) in the mixture, thereby obtaining a grease for a refrigerating machine oil.
  • the optional components may be added to the mixture after melting the resin (A).
  • the resin (A) may be melted in advance, and the molten resin (A), the hydrocarbon oil, and if necessary, the optional components may be mixed.
  • a temperature at which the resin (A) is melted is not particularly limited as long as it is not lower than the melting point of the resin (A), but from the viewpoint of suppressing deterioration of the hydrocarbon oil, the upper limit is preferably the melting point of the resin (A) + 10°C.
  • the grease for a refrigerating machine oil contains the hydrocarbon oil and the resin (A), in which the unworked penetration is 100 to 340 at 25°C, and thus is hardly soluble in the refrigerant and hardly flows into the refrigerant. Therefore, it is difficult for the grease for a refrigerating machine oil of this embodiment to be discharged from the compressor, and it is possible to prevent the grease for a refrigerating machine oil from adhering to a pipe wall, a heat exchanger, or the like in a refrigeration cycle so as to form an oil film. As a result, it is possible to maintain the thermal conductivity favorably and to suppress the deterioration of the heat exchange capacity.
  • the compressor using the grease for a refrigerating machine oil of this embodiment is like an oil-less compressor since the grease for a refrigerating machine oil is hardly discharged.
  • the grease for a refrigerating machine oil of the present invention is suitable for a refrigerating machine oil of the compressor.
  • the unworked penetration of the grease for a refrigerating machine oil was measured at a measurement temperature of 25°C based on JIS K 2220.
  • the viscosity of the grease for a refrigerating machine oil is measured at measurement temperature 25°C by using a B-type viscosity based on JIS Z 8803.
  • the incompatibility of the grease for a refrigerating machine oil is measured as follows based on JIS K 2211.
  • the grease for a refrigerating machine oil was applied in a lump to the inside of a container by using a hyperglass cylinder (a pressure-resistant container provided with an observation window).
  • the part to which it was applied was one side of the container and the part without the observation window.
  • the hydrofluorocarbon was charged as a refrigerant into the container to half the height of the container, and then the container was hermetically closed.
  • A The lump of the grease for a refrigerating machine oil is not dissolved in the refrigerant.
  • A The lump of the grease for a refrigerating machine oil does not flow together with the refrigerant, and the grease for a refrigerating machine oil has appropriate softness.
  • the grease for a refrigerating machine oil was applied in a lump to a glass plate, and the slidability was evaluated by the feeling the applied grease for a refrigerating machine oil with a finger while rubbing it based on the following evaluation criteria.
  • A represents "success”
  • B is determined as having no practical problem.
  • a polymer (a1) having a unit represented by the General Formula (1) (trade name "NOF POLYBUTENE EMAWET (registered trademark) 30N” prepared by NOF CORPORATION, kinematic viscosity (40°C) of 24,000 mm 2 /s, and number average molecular weight (Mn) of 1,350) was used.
  • a bead-like polyethylene resin (PE) (melting point: 92°C to 127°C, specific gravity: 0.88 to 0.97) having a long diameter of about 2 mm was used as the resin (A).
  • the obtained mixture was heated to 130°C so as to melt the resin (A) in the mixture, thereby obtaining a grease for a refrigerating machine oil.
  • the grease for a refrigerating machine oil was manufactured in the same manner as that used in Example 1 for various measurements and evaluations except that the composition was changed so as to have the composition indicated in Table 1, and various measurements and evaluations were performed. The results are indicated in Table 1 Examples 5-7 are for reference.
  • the grease for a refrigerating machine oil was manufactured in the same manner as that used in Example 1 for various measurements and evaluations except that the composition was changed so as to have the composition indicated in Table 2 by using the polymer (a2) having a unit represented by the General Formula (1) (trade name "NOF POLYBUTENE EMAWET (registered trademark) 3N" prepared by NOF CORPORATION, kinematic viscosity (40°C) of 2,100 mm 2 /s, and number average molecular weight of 720) as the hydrocarbon oil.
  • the results are indicated in Table 2 Example 10 is for reference.
  • the grease for a refrigerating machine oil was manufactured in the same manner as that used in Example 1 for various measurements and evaluations except that the composition was changed so as to have the composition indicated in Table 3, and various measurements and evaluations were carried out. The results are indicated in Table 3.
  • a polymer (a2) having a unit represented by the General Formula (1) (trade name "NOF POLYBUTENE EMAWET (registered trademark) 3N" prepared by NOF CORPORATION, kinematic viscosity (40°C) of 2,100 mm2/s, and number average molecular weight of 720) was used.
  • Silica (a particle diameter of 5 to 50 nm and a specific gravity of 2.2) was used instead of the resin (A).
  • the hydrocarbon oil and silica were mixed so as to obtain the grease for a refrigerating machine oil.
  • the obtained grease for a refrigerating machine oil was heated and defoamed at 130°C for 60 minutes or longer.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Claims (1)

  1. Graisse pour une huile de machine frigorifique, comprenant :
    une huile hydrocarbonée acyclique ayant une viscosité cinématique de 1 500 à 25 000 mm2/s, mesurée à 40 °C d'après la norme JIS K 2283, une masse moléculaire moyenne en nombre de 500 à 3 000, et ayant un motif représenté par la formule générale -(CH2-C(CH3)2)- ; et
    une résine de polyéthylène ou une résine de polypropylène, ayant un point de fusion de 270 °C ou moins,
    dans laquelle la pénétration de la graisse non travaillée est de 100 à 340 à 25 °C d'après la norme JIS K 2220,
    dans laquelle la teneur en l'huile hydrocarbonée acyclique par rapport à la masse totale de la graisse est de 93 % à 96 % en masse et la teneur en la résine de polyéthylène ou en la résine de polypropylène par rapport à la masse totale de la graisse est de 4 % à 7 % en masse dans le cas où la viscosité cinématique de l'huile hydrocarbonée est de 20 000 mm2/s ou plus, et
    dans laquelle la teneur en l'huile hydrocarbonée acyclique par rapport à la masse totale de la graisse est de 90 % à 95 % en masse et la teneur en la résine de polyéthylène ou en la résine de polypropylène par rapport à la masse totale de la graisse est de 5 % à 10 % en masse dans le cas où la viscosité cinématique de l'huile hydrocarbonée est inférieure à 20 000 mm2/s.
EP18202619.5A 2017-10-27 2018-10-25 Graisse pour huile de machine frigorifique Active EP3476924B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017208378A JP7044514B2 (ja) 2017-10-27 2017-10-27 冷凍機油用グリース

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EP3476924A1 EP3476924A1 (fr) 2019-05-01
EP3476924B1 true EP3476924B1 (fr) 2021-05-12

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