CN105102596A - Hydraulic fluid composition - Google Patents

Hydraulic fluid composition Download PDF

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Publication number
CN105102596A
CN105102596A CN201480017969.8A CN201480017969A CN105102596A CN 105102596 A CN105102596 A CN 105102596A CN 201480017969 A CN201480017969 A CN 201480017969A CN 105102596 A CN105102596 A CN 105102596A
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China
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hydraulic fluid
quality
multipolymer
fluid compositions
oil
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八木下和宏
平野亨
置塩直史
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Eneos Corp
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JX Nippon Oil and Energy Corp
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Publication of CN105102596A publication Critical patent/CN105102596A/en
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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
    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/10—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
    • C10M145/16—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate polycarboxylic
    • 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
    • C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
    • C10M143/04—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing propene
    • 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
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/005—Macromolecular compounds, e.g. macromolecular compounds composed of alternatively specified monomers not covered by the same main group
    • 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
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
    • 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
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions 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
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • 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
    • C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • 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
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/041—Triaryl phosphates
    • 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
    • C10N2030/02—Pour-point; 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
    • C10N2030/40—Low content or no content compositions
    • C10N2030/43—Sulfur free or low sulfur content 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
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/68—Shear stability
    • 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
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

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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)

Abstract

Provided is a hydraulic fluid composition containing: a lubricant base oil; and 0.2-40 mass% with respect to the total amount of the hydraulic fuel composition of at least one copolymer selected from an olefin copolymer having a number average molecular weight of no greater than 18,000, and a copolymer of a dicarboxylic acid ester and an alpha-olefin and having a number average molecular weight of no greater than 20,000.

Description

Hydraulic fluid compositions
Technical field
The present invention relates to hydraulic fluid compositions.Specifically, the hydraulic fluid compositions with high energy gamma source efficiency containing viscosity index improver is related to.
Background technology
In recent years, have developed a kind of method that energy-saving hydraulic oil is used as tackling global greenhouse effect.In existing energy-saving hydraulic oil, such as, there is the type seeking to carry out energy consumption when cutting device starts by reducing low temperature viscosity.
In addition, also exploitation has by coordinating viscosity index improver, the energy-saving hydraulic oil that the energy consumption when viscosity B coefficent of hydraulic efficiency oil being reduced thus oil temperature is raised rear steady running reduces.This energy-saving hydraulic oil prevents the specific leakage of oil (internal leakage) from various hydraulic machine inside of construction machinery by the viscosity B coefficent (high viscosity index (HVI)) reducing hydraulic efficiency oil, to realize reducing energy consumption (such as can refer to patent documentation 1 to 3).
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open 2005-307197 publication
Patent documentation 2: Japanese Patent Laid-Open 2011-046900 publication
Patent documentation 3: Japanese Patent Laid-Open 2012-180535 publication
Summary of the invention
But energy-saving hydraulic oil described in above-mentioned patent documentation 1 to 3, can cause loss to increase because of the resistance of ducting caused by high viscosity index (HVI) of hydraulic efficiency oil.Therefore, even if by preventing internal leakage from energy consumption can be cut down, also in the Energy efficiency this point promoting oil hydraulic system entirety, still have room for improvement.
The present invention completes in view of the foregoing, and its object is to provides one can prevent internal leakage simultaneously and reduce the resistance of ducting, and can promote the hydraulic fluid compositions of the Energy efficiency of oil hydraulic system entirety.
The present inventor are by further investigation, final discovery, by coordinating the hydraulic fluid compositions of the specific copolymer gained of specified quantitative in lubricant base, there is the superior viscosity characteristics that can simultaneously realize preventing oil hydraulic system internal leakage and reducing the resistance of ducting, thus complete the present invention.
Namely, the invention provides a kind of hydraulic fluid compositions, this hydraulic fluid compositions contain lubricant base and with hydraulic fluid compositions total amount for reference level is the multipolymer of 0.2 ~ 40 quality %, described multipolymer be selected from number-average molecular weight be less than 20000 olefin copolymer and number-average molecular weight be less than 20000 alhpa olefin and the multipolymer that formed of dicarboxylic ester at least one.
In addition, described hydraulic fluid compositions preferred viscosities index is more than 155, and kinematic viscosity (the unit mm at (A) 80 DEG C 2/ s) with (B) 80 DEG C at shear viscosity (unit mPas, shearing condition 10 6/ s) ratio (A/B) be less than 1.3.
Hydraulic fluid compositions of the present invention is while possessing shear viscosity, and kinematic viscosity is lower, has and can realize preventing internal leakage and reducing the resistance of ducting simultaneously, and can promote the unusual effect of the Energy efficiency of oil hydraulic system entirety.
Embodiment
Below the preferred embodiment of the present invention is described.
Hydraulic fluid compositions involved by embodiments of the present invention, containing lubricant base and multipolymer, described multipolymer be selected from number-average molecular weight be less than 20000 olefin copolymer and number-average molecular weight be less than 20000 alhpa olefin and the multipolymer that formed of dicarboxylic ester at least one.
As the lubricant base used in present embodiment, mineral oil, synthetic hydrocarbon oil, synthesizing oxygen-containing oil, grease etc. can be enumerated.For these lubricant bases, can be used alone one, also can be used in combination of two or more.
As mineral oil, there is no particular limitation, such as, can enumerate the lubricating oil distillate of crude oil through air distillation and underpressure distillation gained, paraffin series mineral oil refining after the refinement treatment such as appropriately combined solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrofining, sulfuric acid scrubbing, clay treatment or naphthene series mineral oil.
As synthetic hydrocarbon oil, such as poly-alpha-olefin (polybutene, 1-octene oligomers, 1-decene oligopolymer etc.), alkylbenzene, alkylnaphthalene etc. can be enumerated.
As synthesizing oxygen-containing oil, such as, the ester classes such as the polyol ester of the monoesters of monohydroxy-alcohol and unary fatty acid, polyvalent alcohol and unary fatty acid can be adopted; Polyoxyalkylene glycol class etc.
As grease, such as, the Vegetable oil lipoprotein such as plam oil, palm-kernel oil, rapeseed oil, soybean oil, high gas oil ratio rapeseed oil and high oleic sunflower oil can be adopted.
In these oil, preferably use mineral oil and synthetic hydrocarbon oil, more preferably use mineral oil.
The kinematic viscosity of lubricant base 40 DEG C time is not particularly limited, but is preferably 15mm 2/ more than s, is more preferably 20mm 2/ more than s, further preferred 25mm 2/ more than s, most preferably is 30mm 2/ more than s.In addition, the kinematic viscosity of lubricant base 40 DEG C time is preferably 50mm 2/ below s, is more preferably 45mm 2/ below s, more preferably 40mm 2/ below s, most preferably is 35mm 2/ below s.Kinematic viscosity when lubricant base is at 40 DEG C is 15mm 2during/more than s, comparatively preferred from the viewpoint of its vapo(u)rability, and the kinematic viscosity when lubricant base is at 40 DEG C is 50mm 2during/below s, therefore comparatively preferred due to the resistance of ducting can be reduced.
The viscosity index of lubricant base is not particularly limited, but is preferably more than 150, is more preferably more than 160, more preferably more than 170, most preferably is more than 175.When viscosity index is more than 150, kinematic viscosity during low temperature while its kinematic viscosity when ensure that high temperature, can be suppressed to raise, therefore, it is possible to suppress the efficiency of oil hydraulic system to reduce, comparatively preferred from this point of view.On the other hand, there is no particular limitation for the higher limit of viscosity index, such as, can be 250.
It should be pointed out that " kinematic viscosity " and " viscosity index " described in this specification sheets, refer to and carry out according to JISK2283 the numerical value that measures.
The content of lubricant base, with hydraulic fluid compositions total amount for benchmark, is preferably more than 50 quality %, is more preferably more than 60 quality %, more preferably more than 70 quality %.In addition, the content of lubricant base, with hydraulic fluid compositions total amount for benchmark, is preferably below 99 quality %, is more preferably below 98 quality %.When the content of lubricant base is more than 50 quality %, easily play the superior effect of hydraulic efficiency oil fully.
The hydraulic fluid compositions of present embodiment, containing be selected from number-average molecular weight be less than 20000 olefin copolymer and number-average molecular weight be less than 20000 alhpa olefin and the multipolymer that formed of dicarboxylic ester at least one multipolymer.
Should be understood that, " number-average molecular weight " in this specification sheets refers to the number-average molecular weight of the polystyrene conversion of being tried to achieve by gel permeation chromatography (GelPermeationChromatography, GPC) assay method (reference material: polystyrene).
Olefin copolymer refers to co-oligomer or the multipolymer of ethene and alpha-olefin.As alpha-olefin, propylene, 1-butylene, 1-amylene etc. can be enumerated, wherein preferably use propylene.As the multipolymer of ethene and alpha-olefin, having no particular limits, can be unregulated polymer or segmented copolymer.
The number-average molecular weight of olefin copolymer is less than 18000, preferably less than 16000, more preferably less than 14000, further preferably less than 10000.In addition, the number-average molecular weight of olefin copolymer is preferably more than 700, is more preferably more than 1000, and more preferably more than 1500.When number-average molecular weight is below 18000, comparatively preferred from the viewpoint of pump efficiency; When number-average molecular weight is more than 700, the viewpoint increased from the improvement effect of viscosity index is comparatively preferred.
As the multipolymer that alhpa olefin and dicarboxylic ester are formed, such as, the compound represented by stating in general formula (1) can be listed below.
[changing 1]
In above-mentioned formula (1), R 1represent straight or branched alkyl.In addition, R 2~ R 5can be identical, also can be different, they represent hydrogen, straight or branched alkyl, respectively with-R 6-CO 2r 7or-CO 2r 8ester group (the R represented 6represent straight chain or branched alkylidene, R 7with R 8can be the same or different, represent straight or branched alkyl respectively) in any one, R 2~ R 5in any two be above-mentioned ester group.In addition, X and Y can be the same or different, and represents positive number respectively.
At this, the part-structure represented with following general formula (2) in above-mentioned general formula (1) is from alpha-olefin, and the carbon number of this alpha-olefin is 3 to 20, and preferred carbon number is 6 to 18.
[changing 2]
As this alpha-olefin, propylene, 1-butylene, 1-amylene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecylene, 1-dodecylene, 1-tridecylene, tetradecene, 1-15 carbene, cetene, 1-heptadecene, 1-vaccenic acid, 1-19 carbene, 1-eicosylene etc. specifically can be enumerated.
In addition, the part-structure represented with following general formula (3) in above-mentioned general formula (1) is from dicarboxylic ester.
[changing 3]
As this dicarboxylic acid, specifically toxilic acid, fumaric acid, citraconic acid, methylfumaric acid, methylene-succinic acid etc. can be enumerated.
The number-average molecular weight of the multipolymer of alhpa olefin and dicarboxylic diester is less than 20000, preferably less than 18000, more preferably less than 14000, further preferably less than 12000, most preferably less than 10000.When number-average molecular weight is below 20000, comparatively preferred from the viewpoint of the ability improving pump efficiency.In addition, the number-average molecular weight of the multipolymer of alhpa olefin and dicarboxylic diester is not particularly limited, and is preferably more than 5000, is more preferably more than 6000, more preferably more than 8000.When number-average molecular weight is more than 5000, comparatively preferred from the viewpoint putting forward full-bodied ability.
The kinematic viscosity of multipolymer 100 DEG C time of alhpa olefin and dicarboxylic ester, is not particularly limited, and is preferably 1mm 2/ more than s, is more preferably 10mm 2/ more than s, more preferably 50mm 2/ more than s, most preferably is 200mm 2/ more than s, in addition, is preferably 5000mm 2/ below s, is more preferably 3000mm 2/ below s, more preferably 2000mm 2/ below s, most preferably is 1000mm 2/ below s.Kinematic viscosity when 100 DEG C is 1mm 2during/more than s, comparatively preferred from the viewpoint of high viscosity; At 5000mm 2during/below s, comparatively preferred from the viewpoint of operability when manufacturing.
In the present embodiment, when being used together with the multipolymer of dicarboxylic ester with alhpa olefin by olefin copolymer, the ratio between them can be not particularly limited for arbitrary proportion.
The content of multipolymer with hydraulic fluid compositions total amount for benchmark is 0.2 ~ 40 quality %.When the content of multipolymer is more than 0.2 quality %, easily obtain the effect coordinated.In addition, when the content of multipolymer is below 40 quality %, comparatively preferred from the viewpoint of solvability and stability.
When olefin copolymer is used alone as multipolymer, the content of multipolymer with hydraulic fluid compositions total amount for benchmark is preferably below 20 quality %, be more preferably below 15 quality %, more preferably below 10 quality %, most preferably be below 8 quality %.In addition, the content of multipolymer is preferably more than 0.2 quality % with hydraulic fluid compositions total amount for benchmark, is more preferably more than 0.5 quality %, more preferably more than 1 quality %, most preferably is more than 3 quality %.
When multipolymer alhpa olefin and dicarboxylic ester formed is used alone as multipolymer, the content of multipolymer with hydraulic fluid compositions total amount for benchmark is below 40 quality %, be preferably below 35 quality %, be more preferably below 30 quality %, more preferably below 25 quality %.In addition, the content of multipolymer is preferably more than 1 quality % with hydraulic fluid compositions total amount for benchmark, is more preferably more than 3 quality %, more preferably more than 5 quality %, most preferably is more than 10 quality %.
When olefin copolymer is used as multipolymer together with the multipolymer that dicarboxylic ester is formed with alhpa olefin, the content of multipolymer with hydraulic fluid compositions total amount for benchmark is below 40 quality %, be preferably below 35 quality %, be more preferably below 30 quality %, more preferably below 25 quality %.In addition, the content of multipolymer for benchmark is more than 0.1 quality % with hydraulic fluid compositions total amount, is preferably more than 1 quality %, is more preferably more than 3 quality %, more preferably more than 5 quality %.
When the content of the multipolymer of olefin copolymer and/or alhpa olefin and dicarboxylic ester is more than afore mentioned rules amount, easily obtain the effect coordinated, for below afore mentioned rules amount time, comparatively preferred from the viewpoint of solvability and stability.
The kinematic viscosity of hydraulic fluid compositions 40 DEG C time, there is no particular limitation, is preferably 20mm 2/ more than s, is more preferably 30mm 2/ more than s, more preferably 40mm 2/ more than s, most preferably is 45mm 2/ more than s.In addition, the kinematic viscosity of hydraulic fluid compositions 40 DEG C time, is preferably 80mm 2/ below s, is more preferably 70mm 2/ below s, more preferably 60mm 2/ below s, most preferably is 50mm 2/ below s.Kinematic viscosity when hydraulic fluid compositions is at 40 DEG C is 20mm 2during/more than s, comparatively preferred from the viewpoint of the weather resistance of oil hydraulic system; At 80mm 2during/below s, comparatively preferred from the viewpoint reducing friction.
The viscosity index of hydraulic fluid compositions preferably more than 150, more preferably more than 155, further preferably more than 160, most preferably more than 165.When viscosity index is more than 150, optimum range of viscosities can be maintained in temperature range widely, therefore comparatively preferred.On the other hand, there is no particular limitation for the higher limit of viscosity index, such as, can be 250.
Kinematic viscosity at (A) 80 DEG C of hydraulic fluid compositions and shear viscosity (unit: mPas, the shearing condition: 10 at (B) 80 DEG C 6/ s) ratio (A/B) there is no particular limitation, be preferably less than 1.4, be more preferably less than 1.3, more preferably less than 1.25, most preferably be less than 1.2.When above-mentioned A/B is less than 1.4, comparatively preferred from the viewpoint of pump efficiency and the resistance of ducting.On the other hand, there is no particular limitation for the lower value of above-mentioned A/B, such as, can be 1.1.
It should be pointed out that " shear viscosity " in this specification sheets, refer to ASTM (D4741, D4683, D6616), CEC (L-36A-90) carries out measuring the result of gained for standard.
In order to promote the excellent effect of the hydraulic fluid compositions involved by present embodiment further, they can as required further containing extreme-pressure additive, antioxidant, pour point depressant, rust-preventive agent, metal passivator, viscosity index improver, defoamer, emulsion splitter, oiliness improver etc.These additives can be used alone a kind, also can use in combination of two or more.
As extreme-pressure additive, chalcogenide compound, zinc dithiophosphate, the phosphorus series compounds etc. such as sulfuration ester, sulfuration grease, polysulfide can be enumerated, wherein preferably adopt phosphorus compound.Specifically, phosphoric acid ester, phosphate ester acid, the amine salt of phosphate ester acid, chlorinated phosphate, phosphorous acid ester and thiophosphatephosphorothioate etc. can be enumerated.In these phosphorus compounds, the ester or derivatives thereof of phosphoric acid, phosphorous acid or thiophosphoric acid and alkanol, polyether-type alcohol can be enumerated.
In above-mentioned phosphorus compound, in order to obtain higher abrasion resistance properties, and the amine salt of preferably phosphoric acid ester, phosphate ester acid and phosphate ester acid, be wherein more preferably phosphoric acid ester.The content of extreme-pressure additive, with hydraulic fluid compositions total amount for benchmark, is preferably 0.05 ~ 5 quality %.
As antioxidant, such as, the aromatic amine such as phenol compound, phenyl-a-naphthylamine, hindered amine compound, phosphorous acid ester and the organometallic compounds such as 2,6 ditertiary butyl p cresol (DBPC) can be enumerated.The content of phenolic antioxidants, with hydraulic fluid compositions total amount for benchmark, is preferably 0.01 ~ 2 quality %.In addition, the content of amine antioxidants, with hydraulic fluid compositions total amount for benchmark, is preferably 0.001 ~ 2 quality %.
As pour point depressant, the multipolymer or its hydrogenation thing etc. of at least one monomer be selected from various acrylate and methacrylic ester can be enumerated.The content of pour point depressant, with hydraulic fluid compositions total amount for benchmark, is preferably 0.01 ~ 5 quality %.
As rust-preventive agent, the partial ester of amino acid derivative, polyvalent alcohol can be enumerated; The ester classes such as wool acid esters, alkyl acid esters, alkenyl succinate acid esters; Sarkosine; The polyol partial esters classes such as sorbitan fatty acid ester; The metal soaps such as fatty acid metal salt, lanolin fatty acid metal-salt, oxidized petroleum waves metal-salt; The Sulfonates such as calcium sulphonate, barium sulfonate; Oxidized petroleum waves; Amine; Phosphoric acid; Phosphoric acid salt etc.The content of rust-preventive agent, with hydraulic fluid compositions total amount for benchmark, is preferably 0.01 ~ 5 quality %.
As metal passivator, benzotriazole category, thiadiazole, glyoxaline compound etc. can be exemplified.The content of metal passivator for benchmark, is preferably 0.001 ~ 1 quality % with hydraulic fluid compositions total amount.
The hydraulic fluid compositions of present embodiment, can further containing the viscosity index improver beyond above-mentioned multipolymer.As its specific examples, at least one monomer be selected from all kinds of methacrylic ester can be enumerated and carry out being polymerized the non-dispersive type viscosity index improvers etc. such as the multipolymer of gained or its hydride, polyisobutene or its hydride, the hydride of styrenic-diene multipolymer and alkyl styrenes.The content of the viscosity index improver beyond above-mentioned multipolymer, with hydraulic fluid compositions total amount for benchmark, is preferably 0.01 ~ 15 quality %.
As defoamer, the silicone resin such as dimethyl siloxane, trifluoropropyl siloxane class can be exemplified.The content of defoamer, with hydraulic fluid compositions total amount for benchmark, is preferably 0.001 ~ 0.05 quality %.
As emulsion splitter, such as, polyoxyalkylene glycol, polyoxyalkylene alkyl ether, polyoxyalkylene alkylamine acid amides, polyoxyalkylene fatty acid esters etc. can be enumerated.
As oiliness improver, lipid acid, ester class, alcohols etc. can be enumerated.The content of oiliness improver, with hydraulic fluid compositions total amount for benchmark, is preferably 0.01 ~ 0.5 quality %.
Embodiment
Further will be illustrated the present invention by embodiment and comparative example below, but these contents do not play any restriction effect to the present invention.
In embodiment 1 to 4 and comparative example 1 to 4, coordinate lubricant base and additive by according to the composition shown in such as table 1 and table 2, prepare hydraulic fluid compositions.The lubricant base used in embodiment and comparative example and additive are as described below.
< lubricant base >
Base oil 1: hydrofinishing mineral oil (all aromatic content: 0.0 quality %, sulphur content: below 10 quality ppm, 40 DEG C of kinematic viscosity: 20mm 2/ s, viscosity index: 124)
Base oil 2: hydrofinishing mineral oil (all aromatic content: 0.0 quality %, sulphur content: below 10 quality ppm, 40 DEG C of kinematic viscosity: 26mm 2/ sec, viscosity index: 131)
Base oil 3: hydrogenation refinery mineral oil (all aromatic content: 0.0 quality %, sulphur content: below 10 quality ppm, 40 DEG C of kinematic viscosity: 46mm 2/ sec, viscosity index: 127)
Here all aromatic content is the result carrying out measuring gained according to the silica-alumina gel chromatography described in AnalyticalChemistry the 44th volume No. 6 (1972) 915-919 page " SeparationofHigh-BoilingPetroleumDistillatesUsingGradien tElutionThroughDual-Packed (SilicaGel-AluminaGel) AdsorptionColumns ".
In addition, sulphur content is measured by ASTMD4951 " StandardTestMethodforDeterminationofAdditiveElementsinLu bricatingOilsbyInductivelyCoupledPlasmaAtomicEmissionSpe ctrometry ".
In addition, kinematic viscosity and viscosity index measure according to JISK2283.
< viscosity index improver >
A: ethylene propylene copolymer (Mitsui Chemicals, Inc. manufactures: ル ー カ Application ト HC2000, number-average molecular weight 13100)
B: (ケ ッ チ ェ ンル Block company manufactures the multipolymer of alhpa olefin and dicarboxylic ester: KL2700, number-average molecular weight 9800, the kinematic viscosity 700mm at 100 DEG C 2/ sec)
C: styrenic-diene multipolymer (イ Application Off ィ ニ ア system company manufactures: SV151, number-average molecular weight 144000)
D: polymethacrylate (Sanyo changes into company and manufactures, number-average molecular weight 40000)
E: polymethacrylate (Sanyo changes into company and manufactures, number-average molecular weight 100000)
F: olefin copolymer (シ ェ Block ロ Application company manufactures: PARATONE8451, number-average molecular weight 230000)
Other additives of < >
In embodiment 1 to 4 and comparative example 1 to 4, with hydraulic fluid compositions total amount for benchmark, coordinate the Tritolyl Phosphate of 0.5 quality %, 2,6 ditertiary butyl p cresol (DBPC) and pour point depressant respectively, as other additives.
For each hydraulic fluid compositions obtained in embodiment 1 to 4 and comparative example 1 to 4, as follows each proterties is measured.Its result is shown in table 1 and table 2.
Kinematic viscosity and viscosity index: measure according to JISK2283.
Shear viscosity: with ASTM (D4741, D4683, D6616), CEC (L-36A-90) for standard, be 10 80 DEG C of down cut conditions 6measure under the environment of/s.Adopt USV (UltraShearViscometer) viscometer of PCSInstruments company manufacture as determinator.
[experiment of HPV35+35 pump]
For each hydraulic fluid compositions obtained in embodiment 1 to 4 and comparative example 1 to 4, carry out the experiment of HPV35+35 pump.Specifically, under following experiment condition, the rotary torque of pump is measured, thus calculate whole efficiency.Its result is shown in table 1 and table 2.
Pump name: コ マ Star HPV35+35
Pump output+output: 40L/min
Pump-type: swash plate type
Oil temperature: 80 DEG C
Pressure: non-loaded, 35MPa
Revolution speed: 2100rpm
[table 1]
[table 2]

Claims (2)

1. hydraulic fluid compositions, its contain lubricant base and with hydraulic fluid compositions total amount for reference level is the multipolymer of 0.2 ~ 40 quality %, described multipolymer be selected from number-average molecular weight be less than 18000 olefin copolymer and number-average molecular weight be less than 20000 alhpa olefin and the multipolymer that formed of dicarboxylic ester at least one.
2. hydraulic fluid compositions as claimed in claim 1, wherein, the viscosity index of described hydraulic fluid compositions is more than 150, and the kinematic viscosity (A) at 80 DEG C is less than 1.3 with the ratio (A/B) of the shear viscosity at (B) 80 DEG C, wherein, the unit of described kinematic viscosity is mm 2/ s, the unit of described shear viscosity is mPas, and shearing condition is 10 6/ s.
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