JP2952044B2 - Hydraulic oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic fluid, and more particularly to a hydraulic fluid used for door clousers, floor hinges and the like.

[0002]

2. Description of the Related Art In order to smoothly open and close a door, a hydraulic shock absorber such as a door clouser is widely used. For example, door clousers mainly consist of a cylinder, piston and hydraulic oil, and the cylinder and piston move through the orifice provided in the cylinder at a constant speed to pass the hydraulic oil at a constant speed to open and close the door constantly. It has a function to make it work.

In such door clousers,
Since the opening / closing property of the door depends on the passage speed of the hydraulic fluid through the orifice, the hydraulic fluid is required to have a small viscosity change due to temperature change, that is, a high viscosity index, in order to keep the door openability constant, Further, the wear resistance of the gear portion in the door clouser is also required.

At present, a hydraulic oil obtained by adding a viscosity index improver to a mineral oil is used as a hydraulic oil. However, in order to achieve the above object, a large amount of a viscosity index improver is added to this kind of hydraulic oil to reduce the temperature. Because it creates problems with liquidity,
There are certain limitations. For that reason, Dork Roser
At present, there is provided a mechanism for adjusting the diameter of the orifice to make the opening and closing of the door constant.

However, with the recent miniaturization of door clousers, there has been a demand for higher performance of hydraulic fluids, and even if the processing accuracy of cylinders and pistons in door crazers is low, the opening and closing of doors is difficult. There is a demand for providing a hydraulic oil capable of keeping the pressure constant.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention
Suitable for various door clousers, floor hinges, etc.
It is an object of the present invention to provide a hydraulic fluid having a high viscosity index and low-temperature fluidity, abrasion resistance, and oxidation stability.

[0007]

Means for Solving the Problems The hydraulic fluid of the present invention comprises:
High viscosity with viscosity at 40 ° C of 170 to 30000 cSt
Water-soluble polyalkylene glycol and a viscosity at 40 ° C. of 5-1
It is composed of a low-viscosity oil having a viscosity of 70 cSt , and has a viscosity at 40 ° C. of 170 to 1000 cSt .

[0008] In addition, hydraulic oils of the present invention the above-mentioned hydraulic operation
The fluid oil is characterized by further adding at least one or more viscosity index improvers, antiwear agents, antioxidants, or corrosion inhibitors.

[0009] Hereinafter, will be described in detail the hydraulic oils of the present invention.

[0010] First, the hydraulic oils of the present invention, one formed
In minutes, the viscosity at 40 ° C. is 170 to 30000 cSt.
Can be used .

[0011] As the polyalkylene glycol, the carbon number of the alkylene group is 2 to 5, preferably 2 to 3
Is a ring-opened polymer or a ring-opened copolymer of a linear or branched alkylene oxide. The alkylene oxide is ethylene oxide, propylene oxide, butylene oxide, or a mixture thereof, preferably propylene oxide. Preferably molecular weight 1000
5,000 polyethylene glycol and polypropylene glycol. The molecular chain includes one having both ends of an alkyl group, one end having an alkyl group and the other end having a hydroxyl group, and both ends having a hydroxyl group. The terminal alkyl group has 1 to 18 carbon atoms.

The hydraulic fluid has a kinematic viscosity at 40 ° C. obtained by adjusting the degree of polymerization of 170 to 1000.
is intended to use those cSt, a viscosity index of such polyalkylene glycol is from 190 to 300, is of high viscosity index which are suitable for hydraulic fluids. In addition, they have found that since they have a high viscosity, they are not significantly affected by downsizing and processing accuracy of the door clouser and have high wear resistance.

[0013] These polyalkylene glycols also have a pour point of -20 ° C or less, have excellent low-temperature fluidity,
Further, since it has excellent oxidation stability, it satisfies various performances required for a hydraulic oil.

[0014] Next, the hydraulic fluid of the present invention, the high-viscosity polyalkylene glycol, further viscosity at 40 ° C. polyalkylene green calls having higher molecular weight is 17
0 to 30,000 cSt and low viscosity oil
While maintaining the viscosity at 0 ° C. at 170-1000 cSt ,
The viscosity index is further improved as compared with the case of using polyalkylene glycol alone.

[0015] Such low-viscosity oils include low-viscosity olefin oligomers, alkylbenzenes and derivatives thereof,
Mineral oils, organic acid esters, phosphate esters, low viscosity polyalkylene glycols, fluorinated oils and the like can be used. The kinematic viscosity of these low viscosity oils is 5 to 1 at 40 ° C.
It is good to use a low viscosity oil of 70 cSt , preferably 10 to 100 cSt .

As the low-viscosity olefin oligomer, any one homopolymer or two or more selected from olefin hydrocarbons having or not having a branch having 2 to 14, preferably 4 to 12 carbon atoms. Which is selected from products having an average molecular weight of from 100 to about 2,000, preferably from 200 to about 1,000, particularly preferably those from which unsaturated bonds have been removed by hydrogenation. Preferred olefin oligomers include, for example, polybutene, α-olefin oligomer, ethylene
α-olefin oligomers and the like. As the polybutene, for example, those obtained mainly by isobutene and obtained by copolymerizing a monomer mixture of butene-1 and butene-2 are preferable.

Further , as the α-olefin oligomer,
An α-olefin mixture having 6 to 12 carbon atoms obtained by pyrolysis of a hydrocarbon or trimerization to hexamerization of a lower olefin, for example, 25% to 50% by weight of hexene-1 and 30% to 40% by weight of octene-1 A copolymer obtained by copolymerizing a mixture of 25% by weight and 40% by weight of decene-1 by weight can be used.

[0018] Also, oligomers obtained from such decene alone monomers are also suitable. Further, as the ethylene / α-olefin oligomer, ethylene is 40% by weight to 9% by weight.
A polymer obtained by mixing and polymerizing 0% by weight of an α-olefin, for example, propylene, in a proportion of 10% by weight to 60% by weight can be used.

[0019] These olefin oligomers can be produced by using aluminum chloride, Friedel-Crafts type catalyst such as boron fluoride, an oxide catalyst such as Ziegler catalyst and chromium oxide. The hydrogenation of the olefin oligomer is carried out by removing the catalyst from the reaction product, heating,
It can be carried out under pressure by contacting with a hydrogenation catalyst such as, for example, nickel-molybdenum / alumina.

Next, is intended primarily alkylbenzene type as alkylbenzene, the alkylation of aromatic hydrocarbons such as benzene and toluene in the Friedel-Crafts reaction or the like, by-produced in making raw materials of the detergent, mainly An oil containing a dialkylated aromatic hydrocarbon. As the alkyl group, straight-chain or branched ones belong to this.

The mineral oil is a hydrocarbon oil fraction having a lubricating viscosity. For example, a raffinate obtained by extracting a vacuum distilled distillate with a solvent such as phenol, furfural or N-methylpyrrolidone is converted to propane or methyl ethyl ketone. Hydrocarbon distillate oil obtained after solvent dewaxing treatment with a solvent such as described above, and further subjected to hydrorefining as necessary to improve hue and remove unstable substances, or this hydrocarbon distillate Mixtures of oils and residual oils that have been subjected to solvent extraction, solvent dewaxing, and solvent demarcation can be used. In some cases, catalytic dewaxing is performed instead of solvent dewaxing. These refined mineral oils may be paraffinic, naphthenic, etc. alone or may be a mixture of these hydrocarbon oils.

Next, as one of the organic acid esters include those obtained by reacting an aliphatic alcohol aliphatic dibasic acid and 4 to 14 carbon atoms 4-14 carbon atoms.

The dibasic acids that can be used in the synthesis include, for example, succinic acid, glutaric acid, adipic acid,
Piperic acid, suberic acid, azelaic acid, sebacic acid,
Undecandioic acid, dodecandioic acid, brassic acid, and tetradecandioic acid, preferably adipic acid, azelaic acid,
Sebacic acid, dodecane diacid and the like can be mentioned,
Among these, adipic acid and sebacic acid are particularly preferred.

Examples of the aliphatic alcohol include n-butanol, isobutanol, n-amyl alcohol, isoamyl alcohol, n-hexanol, 2-ethylbutanol, cyclohexanol, n-heptanol, isoheptanol, methylcyclohexanol, n-butanol -Octanol, dimethylhexanol, 2-ethylhexanol, 2,4,4-trimethylpentanol, isooctanol, 3,5,5-trimethylhexanol, isononanol, isodecanol, isoundecanol, 2
Examples thereof include -butyloctanol, tridecanol and isotetradecanol, and particularly preferred are 2-ethylhexanol, isodecanol and tridecanol.

[0025] Synthesis of diester from a dibasic acid and alcohols can be carried out conventional methods, the method of dehydration condensation under such as acidic catalyst. The diester thus obtained is, for example, di- (1-ethylpropyl) adipate, di- (3-methylbutyl) adipate, di-
(1,3-dimethylbutyl) adipate, di- (2-ethylbutyl) adipate, di (2-ethylhexyl)
Adipate, di- (isooctyl) adipate, di-
(Isononyl) adipate, di- (3,5,5 trimethylhexyl) adipate, di- (isodecyl) adipate, di- (undecyl) adipate, di- (tridecyl) adipate, di- (isotetradecyl) adipate, di- (2,2,4-trimethylpentyl) adipate, di- [mixture (2-ethylhexyl, isononyl)]
Adipate, di- (1-ethylpropyl) azelate,
Di- (2-ethylbutyl) azelate, di- (2-ethylhexyl) azelate, di (isooctyl) azelate, di- (isononyl) azelate, di- (3,5)
5-trimethylhexyl) azelate, di- (isodecyl) azelate, di- (tridecyl) azelate, di-
[Mixed (2-ethylhexyl, isononyl)] azelate, di- [mixed (2-ethylhexyl, decyl)] azelate, di- [mixed (2-ethylhexyl, isodecyl)] azelate, di- [mixed (2-ethylhexyl,
2-propylheptyl)] azelate, di- [mixture (2
-Ethylhexyl, decyl)] azelate, di- (n-
Butyl) sebacate, di- (isobutyl) sebacate,
Di- (1-ethylpropyl) sebacate, di- (3-methylbutyl) sebacate, di- (1,3-dimethylbutyl) sebacate, di- (2-ethylbutyl) sebacate, di- (2-ethylhexyl) sebacate, di- − [2
-(2'-ethylbutoxy) ethyl] sebacate, di-
(2,2,4-trimethylpentyl) sebacate, di-
(Isononyl) sebacate, di- (3,5,5 trimethylhexyl) sebacate, di- (isodecyl) sebacate, di- (isoundecyl) sebacate, di- (tridecyl) sebacate, di- (isotetradecyl) sebacate, di- [Mixing (2-ethylhexyl, isononyl)]
Sebacate, di- (2-ethylhexyl) glutarate, di- (isoundecyl) glutarate, di- (isotetradecyl) glutarate and the like can be mentioned.

[0026] There are neopentyl polyol ester as another type of organic acid esters. Neopentyl polyol ester is made by synthesizing C 5-9 neopentyl polyol and C 4-18 organic acid.

In the present invention, neopentyl polyol is a polyhydric alcohol having a neopentyl group, for example, 2,2-dimethylpropane-1,3-diol (that is, neopentyl glycol), 2-ethyl-2-butyl -Propane-1,3-diol, 2,2-diethylpropane-1,3-diol, 2,2-dibutylpropane-1,3-diol, 2-methyl-2-propylpropane-1,3-diol, 2-ethyl-2-butylpropane-1,3-diol, trimethylolethane, trimethylolpropane, trimethylolbutane, pentaerythritol, preferably neopentyl glycol,
-Methyl-2-propylpropane-1,3-diol,
Trimethylolpropane and pentaerythritol are preferred, and neopentyl glycol, trimethylolpropane and pentaerythritol are particularly preferred.

[0028] In addition, organic acids are, for example, n- butanoic acid, isobutane acid, n- pentanoic acid, isopentane acid, n- hexanoic acid, 2-ethyl butanoic acid, cyclohexane acid, n- heptanoic acid, isoheptanoic acid, methyl cyclohexane acid,
n-octanoic acid, dimethylhexanoic acid, 2-ethylhexanoic acid, 2,4,4-trimethylpentanoic acid, isooctanoic acid, 3,5,5-trimethylhexanoic acid, n-nonanoic acid, isononanoic acid, isodecanoic acid, Undecanoic acid, 2-butyloctanoic acid, tridecanoic acid, tetradecanoic acid, hexadecanoic acid and octadecanoic acid, preferably heptanoic acid, n-octanoic acid and 2-ethylhexanoic acid.

[0029] Synthesis of neopentyl polyol ester from an organic acid and a neopentyl polyol can be performed prior methods, the method of dehydration condensation under such as acidic catalyst.

The neopentyl polyol ester thus synthesized (hereinafter referred to as neopentylglycol)
The Lumpur NPG, trimethylolpropane TMP, abbreviated pentaerythritol and PE. ), Eg NPG
Di- (heptanoate), NPG di- (2-ethylbutyrate), NPG di- (cyclohexanoate), NPG di- (heptanoate), NPG di-
(Isoheptanoate), NPG di- (octylate), NPG di- (2-ethylhexanoate), N
PG di- (isooctanoate), NPG di- (isononylate), NPG di- (isodecanoate),
NPG di-mixed (hexanoate, heptanoate), NPG di-mixed (hexanoate, octanoate), NPG di-mixed (hexanoate,
Nonylate)｝, NPG di- {mixture (heptanoate, octanoate)}, NPG di- {mixture (heptanoate, nonylate)}, NPG di- {mixture (heptanoate, isooctanoate)}, NPG di-
{Mixing (heptanoate, isononylate)}, NPG
Di- {mixed (isooctanoate, isononylate)}, NPG-di-mixed (butanoate, tridecanoate), NPG-di-mixed (butanoate, tetradecanoate), NPG-di-mixed (Butanoate, hexadecanoate)｝, NPG-di-mixture (butanoate, octadecanoate)｝, NPG-di-mixture (hexanoate, isooctanoate, isononylate)｝, NPG-di- ｛mixture (Hexanoate, isooctanoate, isodecanoate)｝, NP
G • di- {mixed (heptanoate, isooctanoate, isononylate)}, NPG • di- {mixed (heptanoate, isooctanoate, isodecanoate)}, NPG • di- {mixed (octanoate, isononylate, isodecanate)} , TMP tri- (pentanoate), TMP tri- (hexanoate),
TMP tri (heptanoate), TMP tri
(Octanoate), TMP tri- (nonylate),
TMP tri (isopentanoate), TMP tri (2-ethylbutyrate), TMP tri (isopentanoate), TMP tri (isooctanoate), TMP tri ( 2-ethylhexanoate),
TMP tri (isononylate), TMP tri
(Isodecanoate), TMP • tri- [mixture (butyrate, octadecanoate)], TMP • tri- [mixture (hexanoate, hexadecanoate)], TMP •
Tri- [mixed (heptanoate, tridecanoate)], TMP • tri- [mixed (octanoate, decanoate)], TMP • tri- [mixed (octanoate, nonylate)], TMP • tri- [mixed (butyrate, heptanoate, octadeca) Noate)], TMP
Tri- [mixed (pentanoate, heptanoate, tridecanoate)], TMP • Tri- [mixed (hexanoate, heptanoate, octanoate)], P
E • tetra (pentanoate), PE • tetra (hexanoate), PE • tetra (isopentanoate), P
E • tetra (2-ethylbutyrate), PE • tetra (isoheptanoate), PE • tetra (isooctanoate), PE • tetra (2-ethylhexanoate), PE • tetra (isononylate) and Esters of PE with a mixture of linear or branched carboxylic acids having 4 to 8 carbon atoms. Also, neopentyl polyols other than NPG, TMP and PE, ie, 2-methyl-2-propylpropane-1,3-diol, 2,2-diethylpropanediol, trimethylolethane and trimethylolhexane, and the organic acids as described above Examples thereof include polyol esters alone and in combination.

As the phosphoric ester, tricresyl phosphate, tolyl phosphate, tri (2-ethylhexyl) phosphate, alkyl phenyl phosphate, alkyl phenyl phenyl phosphate and the like can be used.

Further, as the low-viscosity polyalkylene glycols, a polymer component and the high viscous polyalkylene glycol is similar, by adjusting the degree of polymerization is intended to be low viscosity, the molecular weight range 100 to 2000 , Preferably from 200 to 1000.

Further, polychlorotrifluoroethylene formula The fluorinated oils represented by the following formula _{- (CF 2 -CFCl) n -} ( wherein, n 4-18) and a molecular weight of 500 to 2,000, the formula _{F - [CF (CF 3)} -CF 2 -O] n-CF 2 CF 3 ( wherein, n 10 to 40) can be used such as those having a molecular weight of 1,500 to 7,000 represented by.

The hydraulic oil of the invention, by mixing the low viscosity oil to the high viscosity polyalkylene glycol, which is a viscosity at 40 ° C. and hydraulic fluids from 170 to 1,000 cSt, thereby It can be a hydraulic oil having a viscosity index in the range of 200 to 400 while maintaining high viscosity.

[0035] The hydraulic fluid of the present invention has been described above.
However, the hydraulic fluid of the present invention is highly viscous,
With excellent wear resistance and oxidizes itself as a synthetic lubricant
It is excellent in prevention, but further, a viscosity index improver,
Antiwear, antioxidant, or corrosion inhibitor
It is desirable to add at least one kind.

The hydraulic fluid to which the viscosity index improver is added is
The viscosity range at 40 ° C. should be 170 to 1000 cSt.
With this, the viscosity index is further improved while maintaining high viscosity.
It is something. By using a viscosity index improver having a viscosity higher than that of the high viscosity polyalkylene glycol, the viscosity index of the hydraulic oil can be improved.

[0037] As such a viscosity index improver, alpha-
Olefin oligomers, polymethacrylates, polyisobutylenes, polyalkylstyrenes, ethylene-propylene copolymers, styrene-diene hydrogenated copolymers, styrene-maleic anhydride copolymers, and the like can be used.

As the α-olefin oligomer, any one kind of homopolymer or diolefin selected from olefinic hydrocarbons having or not having a branch having 35 to 3,500 carbon atoms, preferably 50 to 700 carbon atoms. Are obtained by copolymerization of two or more kinds, and have an average molecular weight of 500 to 5
It is selected from 0000, preferably from 700 to 10,000 products, especially those from which unsaturated bonds have been removed by hydrogenation. Preferred olefin oligomers include, for example, polybutene, α-olefin oligomer, ethylene / α-olefin oligomer, and the like. 4
A kinematic viscosity at 0 ° C. of 10 to 10,000 cSt can be used.

As the polymethacrylate, an alkyl group having 1 to 18 carbon atoms is used as an ester component, and a homopolymer such as polymethacrylate or polyacrylate having a degree of polymerization of 5 or more, methacrylic acid, or acrylic acid is used as a copolymer component. Is a copolymer. As the non-dispersed polymethacrylate, the alcohol component forming the ester is an alkyl group having 1 to 16 carbon atoms, and has an average molecular weight of 20,000 to 1
500,000 polydispersion-type polymethacrylates include an alcohol component forming an ester thereof having 1 to 16 carbon atoms.
A copolymer of methacrylic acid as an alkyl group and ethylene or propylene substituted with a polar group having an average molecular weight of 20,000 to 1.5 million can be used.

Next, as antiwear agents, the phosphorus-based antiwear agent, a compound containing at least one is valid of the following structure as a general formula (1) to (29). In the following formula, R may be the same or different from hydrogen, an alkyl group, an aryl group, or a benzyl group.

[0041]

Embedded image

[0042]

Embedded image

[0043] Hereinafter, a specific compound.

The compound represented by the above structural formula (1) includes triaryl phosphate and the like, for example, benzyl diphenyl phosphate, allyl diphenyl phosphate, triphenyl phosphate, tricresyl phosphate, ethyl diphenyl phosphate. ,
Tributyl phosphate, dibutyl phosphate,
Cresyl diphenyl phosphate, dicresyl phenyl phosphate, ethyl phenyl diphenyl phosphate, diethyl phenyl phenyl phosphate, propyl phenyl diphenyl phosphate, dipropyl phenyl phenyl phosphate, triethyl phenyl phosphate, tripropyl phenyl phosphate, butyl phenyl Phosphate esters such as diphenyl phosphate, dibutyl phenyl phenyl phosphate, tributyl phenyl phosphate, propyl phenyl phenyl phosphate mixture, butyl phenyl phenyl phosphate mixture, etc .; lauryl acid phosphate, stearyl acid phosphate, di-phosphate
There are acidic phosphates such as 2-ethylhexyl phosphate.

Examples of the compound represented by the structural formula (2) include di-n-butylhexylphosphonate.

The compound represented by the structural formula (3) includes n
-Butyl-n-dioctyl phosphinate.

[0047] Examples of the compound represented by the structural formula (5), there are triaryl phosphorothioate sulfonates such, for example, triphenyl phosphorothioate sulfonate, Arukirujiari -
And rufosphorothionate.

The compound represented by the structural formula (15) includes triisopropyl phosphite, diisopropyl phosphite and the like.

The compound represented by the structural formula (16) includes trilauryl thiophosphite.

Examples of the compound represented by the structural formula (22) include hexamethylphosphoric triamide.

The compound represented by the structural formula (24) includes dibutyl phosphoramidate.

The compound represented by the structural formula (28) includes R
Is an octyl group.

The compound represented by the structural formula (29) includes R
Is an octyl group.

[0054] As the sulfur-based anti-wear agent, diphenyl sulfide, diphenyl disulfide, di-n- butyl sulfide, di -n- butyl disulfide, di -tert- dodecyl disulfide, sulfides such as di -tert- dodecyl trisulfide, Sulfurized spam oil,
Sulfurized oils such as sulfurized dipentene, thiocarbonates such as xanthic disulfide, primary alkyl zinc thiophosphate, zinc secondary alkyl thiophosphate, zinc alkyl-allyl thiophosphate, zinc thiophosphate-based antiwear agents such as zinc allyl thiophosphate, etc. Can be used.

The wear inhibitor is used in an amount of 0.01 to 5% by weight, preferably 0.1 to 3% by weight, based on the hydraulic fluid. The above-mentioned wear inhibitors may be used alone or in combination of two or more.

Examples of the antioxidant include dioctyldiphenylamine, phenyl-α-naphthylamine, alkyldiphenylamine, N-nitrosodiphenylamine, phenothiazine, N, N′-dinaphthyl-p
1. amine antioxidants such as phenylenediamine, acridine, N-methylphenothiazine, N-ethylphenothiazine, dipyridylamine, diphenylamine, phenolamine, 2,6-di-t-butyl-α-dimethylaminoparacresol; Phenol antioxidants such as 6-di-t-butylparacresol, 4.4'-methylenebis (2.6-di-t-butylphenol), and 2.6-di-t-butylphenol And organic metal compounds such as organic iron salts such as iron octoate, ferrocene, and iron naphthoate; organic cerium salts such as cerium naphthoate and cerium toluate; and organic zirconium salts such as zirconium octoate. It is preferable to use a system antioxidant. The above antioxidants may be used alone, but may be used in such a manner that a synergistic effect is exhibited by using two or more kinds in combination.

The antioxidant is preferably used in an amount of 0.001 to 5% by weight, preferably 0.01 to 2% by weight, based on the hydraulic oil.

Examples of the corrosion inhibitor include nitrogen compounds such as benzotriazole and derivatives thereof, imidazoline and pyrimidine derivatives, and compounds containing sulfur and nitrogen such as 1,3,4-thiadiazole polysulfide and 1,3,4.
4-thiadiazolyl-2,5-bisdialkyldithiocarbamate, 2- (alkyldithio) benzimidazole, etc., and further β- (o-carboxybenzylthio) propionnitrile or propionic acid can be used. It is used in an amount of 0.001 to 5% by weight, preferably 0.01 to 1.0% by weight.

[0059]

The hydraulic fluid of the present invention has a temperature of 40.degree.
High viscosity polyalkylene glycol having a viscosity of 170 to 30,000 cSt at 40 ° C. and a viscosity of 5 to 170 c at 40 ° C.
A mixed oil of a low viscosity oil which is St, the viscosity at 40 ° C. With 170 to 1,000 cSt, can be of high viscosity index, and can maintain high viscosity Therefore, it can respond to downsizing and processing accuracy of the door clouser, and can also be used as a high-performance hydraulic fluid because it can utilize the low-temperature fluidity, wear resistance, and oxidation stability of the synthetic lubricating oil itself. It is.

[0060] Thus, the hydraulic fluid of the present invention, door closers, floor hinges, general industrial machinery, but used as a construction machine, particularly suitable for doors closers, floor hinges, the torque converter, as the hydraulic fluid in the shock absorber It is a thing.

[0061] Hereinafter, the present invention will be described in detail by way of Examples.

[0062]

Example 1 The following sample oil was prepared as a hydraulic oil.

[0063]  Sample oil 1(Reference example)..Polyoxypropylene glycol
Rumonobutyl ether (Kinematic viscosity at 40 ° C 330cS
t) Sample oil 2(Reference example)..Polyoxyethyleneoxypro
Pyrene glycol monobutyl ether @EO: PO5
0:50 (% by weight)｝ (Kinematic viscosity at 40 ° C. 412cS
t) Sample oil 3. kinematic viscosity at 40 ° C 945cSt, Viscosity index
286 polyoxyethyleneoxypropylene glycol
Rumonobutyl ether @ EO: PO 50:50 (weight
%)｝ 80 parts by weight and kinematic viscosity at 40 ° C. 4cStBird
With 20 parts by weight of ethylene glycol monomethyl ether
Mixed oil (Kinematic viscosity at 40 ° C 380cSt) Sample oil 4. Kinematic viscosity at 40 ° C 945cSt, Viscosity index
286 polyoxyethyleneoxypropylene glycol
Rumonobutyl ether @ EO: PO 50:50 (weight
%) @ 80 parts by weight and kinematic viscosity at 40 ° C of 11.8cS
tDiisooctyl azelate having a viscosity index of 169
Oil (40% kinematic viscosity at 415 ° C)cSt) Sample oil 5. Kinematic viscosity at 40 ° C 24.3cSt, Viscosity finger
Viscosity index for polyoxypropylene glycol of number 136
Dispersion type polymethacrylate (molecular weight 410)
00) containing 40% by weight (kinetic viscosity at 40 ° C.).
Degree 424cSt) Sample oil 6 ... dilaurylha as an antiwear agent in sample oil 1
0.5% by weight of idrogen phosphite, antioxidant
4,4-methylenebis (2,6-di-tert-butyl)
Mixed oil containing 0.2% by weight of phenol (sampler oil) containing the same additives as sample oil 6 in sample oil 7.
Mixed oil sample oil 8 ... sample oil 3 contains the same additives as sample oil 6
Mixed oil sample oil 9 ... sample oil 4 contains the same additives as sample oil 6
Mixed oil sample oil 10 ... sample oil 5 with the same additives as sample oil 6
Mixed oil contained Comparative oil 1 ... Mineral oil (Kinematic viscosity at 40 ° C: 20cSt, Sticky
Degree index 108) 95 parts by weight used in sample oil 5
5 weight percent viscosity index improverPart ofMixed oil (Kinematic viscosity at 40 ° C
32cSt, Viscosity index 190) Comparative oil 2 ... mineral oil (kinematic viscosity at 40 ° C: 20)cSt, Sticky
Degree index 108) 80 parts by weight used in sample oil 5
20 weight percent viscosity index improverPart ofMixed oil (kinematic viscosity at 40 ° C)
Degree 110cSt, Viscosity index 250) The viscosity index of each of these sample oil comparative oils was calculated according to JIS K 2283,
The moving point is measured according to JIS K 2269, and
Using a Falex tester to evaluate extreme pressure
The seizure load (unit: pound) was measured.

The test results are shown below.

[0065]

[Table 1]

As can be seen from the table, the hydraulic oil of the present invention
It is found that the material is excellent in temperature-viscosity characteristics, low-temperature fluidity and load resistance, and is suitable as a hydraulic oil.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10N 40:08 (72) Inventor Tetsuo Miyamoto 1-3-1, Nishitsurugaoka, Oimachi, Iruma-gun, Saitama Prefecture Tonen Co., Ltd. 56) References JP-A-54-34400 (JP, A) JP-B-53-44196 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) C10M 107/34 C10M 145/26 C10N 20:02 C10N 30:02 C10N 30:06 C10N 40:08

Claims (2)

(57) [Claims] 1. A viscosity at 40 ° C. of 170 to 30,000 c.
At 40 ° C with high viscosity polyalkylene glycol which is St
Consisting of a low-viscosity oil having a viscosity of 5 to 170 cSt,
Hydraulic operation with a viscosity at 40 ° C of 170 to 1000 cSt
Fluid. 2. A viscosity index improver, an antiwear agent, an acid
At least one of a corrosion inhibitor or a corrosion inhibitor
The hydraulic oil according to claim 1, wherein the hydraulic oil is added.