JP2003201491A - Hydraulic fluid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyether-based hydraulic fluid having excellent compatibility with a hydrocarbon-based base oil, lubricity, etc. <P>SOLUTION: This polyether-based hydraulic fluid is formed out of a polyether (E) which is expressed by the general formula: R<SP>1</SP>-ä(OCH<SB>2</SB>CH<SB>2</SB>CH<SB>2</SB>CH<SB>2</SB>)m(OA)n}- OH äR<SP>1</SP>is a 1-24C hydrocarbon residue; A is a 2-4C alkylene, provided that A is not 1,4-butylene; and m and n are each an integer more than 1 and make the polyether (E) has a number-average molecular weight of 300-50,000} and has a HLB of ≤6.0 and the number-average molecular weight of 300-50,000. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyether hydraulic fluid. More specifically, the present invention relates to a polyether hydraulic fluid having excellent compatibility with a hydrocarbon base oil and lubricity.

[0002]

2. Description of the Related Art Lubricating properties are required for hydraulic fluids used as power transmission fluids for operating hydraulic equipment and devices in a wide range of construction machines, machine tools, metal and plastic processing machines, vehicles, ships, aircrafts, etc. To be done. Conventionally, mineral oil type,
BACKGROUND ART Emulsion type and synthetic type hydraulic fluids have been improved in lubricity by adding oiliness improvers such as fatty acid esters and fatty acids and extreme pressure agents containing elements such as sulfur, chlorine and phosphorus. However, chlorine-based extreme pressure agents are difficult to use due to environmental problems such as ozone layer depletion and phosphorus-based extreme pressure agents such as eutrophication by wastewater. Further, polyethers having good lubricity have poor compatibility with hydrocarbon base oils such as mineral oils, so that it is difficult to make the product appearance uniform.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a polyether hydraulic fluid which is excellent in compatibility with a hydrocarbon lubricating oil, lubricity, viscosity index and high temperature detergency. .

[0004]

The present inventors have arrived at the present invention as a result of extensive studies in view of the above problems. That is, the present invention is represented by the following general formula (1), has an HLB of 6.0 or less, and a number average molecular weight of 500 to 30,000.
Is a hydraulic fluid composed of polyether (E). R ¹ -{(OCH ₂ CH ₂ CH ₂ CH ₂ ) m (OA) n} -OH (1) [wherein R ¹ is a hydrocarbon group having 1 to 24 carbon atoms, and A is 1,4-
An alkylene group having 2 to 4 carbon atoms excluding a butylene group,
m and n have a number average molecular weight of (E) of 500 to 30,0.
It is an integer of 1 or more, which is 00. ]

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION R ¹ in the general formula (1) is a linear or branched hydrocarbon group having 1 to 24 carbon atoms, specifically, a linear or branched aliphatic hydrocarbon group,
Examples thereof include aromatic hydrocarbon groups and alicyclic hydrocarbon groups. Examples of the linear or branched aliphatic hydrocarbon group include alkyl groups (methyl group, ethyl group, n- and i
-Propyl group, butyl group, pentyl group, hexyl group,
Heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group,
Pentadecyl group, heptadecyl group, octadecyl group, nonadecyl group, eicosyl group, heneicosyl group, docosyl group, tricosyl group, tetracosyl group, etc.); cis-
Alternatively, a trans-unsaturated hydrocarbon group (alkenyl group or alkynyl group, for example, ethenyl group, 1-,
2- and iso-propenyl group, butenyl group, pentynyl group, hexenyl group, peptenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, (Nonadecenyl group, eicosenyl group, heneicosenyl group, docosenyl group, tricosenyl group, tetracosenyl group, etc.)
And so on.

The aromatic hydrocarbon group has 6 to 24 carbon atoms.
Aromatic hydrocarbon groups such as phenyl group, alkylaryl group (o, m or p-methylphenyl group, m, p-
Dimethylphenyl group, 2,6-dimethylphenyl group,
o, m or p-ethylphenyl group, pn-butylphenyl group, p-octylphenyl group, p-nonylphenyl group, etc.), aralkyl group (benzyl group, phenethyl group, etc.), substituted aralkyl group (o, m Or p-methylbenzyl group, pn-butylphenethyl group, etc.), styrylphenyl group, benzylphenyl group and the like. Examples of the alicyclic hydrocarbon group include a cyclopentyl group and a cyclohexyl group. Of these, an aliphatic or alicyclic hydrocarbon group having 4 to 20 carbon atoms is preferable, and an aliphatic or alicyclic hydrocarbon group having 8 to 18 carbon atoms is particularly preferable. If the carbon number exceeds 24, the viscosity index of the hydraulic fluid becomes poor.

A in the general formula (1) is an alkylene group having 2 to 4 carbon atoms excluding the 1,4-butylene group. Examples of the alkylene group having 2 to 4 carbon atoms include ethylene group,
Examples include 1,2- and 1,3-propylene groups, 1,2- and 2,3-butylene groups and isobutylene groups.
A mixture of two or more of these may be used. Of these, preferred are ethylene group, 1,2-propylene group, 1,
A 2-butylene group is preferable, and a branched alkylene group such as a 1,2-propylene group and a 1,2-butylene group is particularly preferable. When the branched alkylene group is present in A, the compatibility with hydrocarbon is improved.

In the general formula (1), m and n are integers of 1 or more with which the number average molecular weight of the polyether (E) is 500 to 30,000. Preferably, the ratio of m to n (m /
n) is 5/95 to 45/55. That is, (OC
H ₂ CH ₂ CH ₂ CH ₂ ) content is (OCH ₂ CH ₂ CH ₂ C
It is preferably 5 to 45 mol% of the total content of H ₂ ) and (OA). Further, it is preferable that (E) has a random bonding portion of an oxytetramethylene group (OCH ₂ CH ₂ CH ₂ CH ₂ ) and another oxyalkylene group (OA group) from the viewpoint of excellent flow characteristics at low temperatures. It is more preferable that 80 mass% or more of the oxytetramethylene group constituting (E) is present in the random bonding portion.

The method for producing the polyether (E) represented by the general formula (1) is as follows: R ¹ OH
~ 24 aliphatic alcohol in the presence of a catalyst, preferably at a temperature of 30 to 120 ° C, preferably at a pressure of 0 to 0.6MP.
It can be produced by adding tetrahydrofuran (hereinafter referred to as THF) and alkylene oxide having 2 to 4 carbon atoms (hereinafter referred to as AO) in a at random or in blocks.

Regarding the above-mentioned catalyst, conventionally known catalysts can be used, but the preferable range differs depending on the case of THF addition and AO addition. Examples of catalysts used in the case of addition-adding THF or addition-copolymerizing with AO include BF ₃ , BCl ₃ , and
Lewis acids such as AlCl ₃ , FeCl ₃ , SnCl ₃ and complexes thereof [eg BF ₃ ether complex, BF ₃ tetrahydrofuran complex (BF ₃ · THF)]; H ₂ SO ₄ , H
Protic acids such as ClO ₄ ; perchlorates of alkali metals such as KClO ₄ and NaClO ₄ ; Ca (ClO ₄ ) ₂ and Mg
Perchlorate of alkaline earth metal such as (ClO ₄ ) ₂ ; Al
Examples thereof include perchlorates of metals other than the above, such as (ClO ₄ ) ₃ . Of these, BF ₃ ether complex and BF ₃ tetrahydrofuran complex (BF ₃ · THF) are preferable.
Is. In addition, the catalyst for the case of adding AO alone may be a commonly used known catalyst, and in addition to the above catalysts, an alkali catalyst such as hydroxide [KOH, NaO
H, CsOH, Ca (OH) _{2 and} other alkali metal or alkaline earth metal hydroxides, etc.]; oxides (K ₂ O,
Oxides of alkali metals or alkaline earth metals such as CaO and BaO); alkali metals (Na, K etc.) and their hydrides (NaH, KH etc.); triethylamine,
Examples include amines such as trimethylamine. Of these, preferably KOH, NaOH, CsOH, BF ₃
Ether complex and BF ₃ tetrahydrofuran complex (BF ₃
-THF). As the AO to be added, A in the general formula (1) is an alkylene group having 2 to 4 carbon atoms, for example, ethylene oxide (hereinafter referred to as EO),
Examples thereof include propylene oxide (hereinafter referred to as PO), 1,2-butylene oxide, 2,3-butylene oxide and isobutylene oxide. Of these, EO, PO and 1,2-butylene oxide are preferable, and PO is particularly preferable. These may be used in combination, and the polymerization method may be random or block. The number of moles of THF added (m) is 3 to 100, and the number of moles of AO added (n) is 5
Is preferably 150 to 150, more preferably 4 to 20 for m and 6 to 50 for n.

The HLB value of the polyether (E) thus obtained is usually 6.0 or less, preferably 5.0 or less, more preferably 2 to 4.
If the HLB value exceeds 6.0, the compatibility of the polyether (E) with hydrocarbons such as mineral oil and polybutene deteriorates.
The HLB value is a value calculated by the Oda formula based on the organic conceptual diagram.
[Showa 51, Engineering Book Co., Ltd.]. Regarding the organic value and the inorganic value for deriving the HLB value, the inorganic group table described in "Organic Conceptual Diagram -Basics and Applications-" [Sankyo Publishing Co., Ltd. (1984)] (Showa 49, Fujita et al. It can be calculated using the reported value).

Number average molecular weight (Mn) of (E) [By hydroxyl value measurement. The same applies below. ] Is 500 to 30,
000, preferably 700 to 10,000, more preferably 800 to 5,000. If it is less than 500, the lubricity of the hydraulic fluid is lowered, and if it exceeds 30,000, the kinematic viscosity of the hydraulic fluid becomes too high.

The polyether hydraulic fluid of the present invention is composed of polyether (E), but the polyether (E) may be a mixture of different compositions, molecular weights, etc. Hydrocarbon oil may be added. As hydrocarbon-based oils, solvent refined oils, paraffin-based mineral oils, naphthene-based mineral oils, alkyls (having 10 to 100 carbon atoms)
Examples thereof include benzene, alkyl (having 10 to 100 carbon atoms) naphthalene, poly-α-olefin (having 2 to 50 carbon atoms), polybutene (weight average molecular weight 200 to 4000), polyisobutene (weight average molecular weight 200 to 4000) and the like. Preferred are solvent refined oils, paraffinic mineral oils, naphthenic mineral oils and polybutenes. Kinematic viscosity of these hydrocarbon oils (measured according to JIS K 2283.)
Is preferably 1 to 320 mm ² / s at 40 ° C. The mixing ratio of the polyether hydraulic oil and the hydrocarbon oil may be arbitrary, but preferably the polyether hydraulic oil / hydrocarbon oil mass ratio is 5/95 to 95/5,
It is more preferably 10/90 to 90/10, and particularly preferably 20/80 to 80/20. Mixed oils can exhibit the characteristics of both polyethers and hydrocarbons. In addition, if necessary, another polyether [polyether in which R ¹ in the general formula (1) is a hydrogen atom, etc.]
Can be blended. Its content is less than 90% by weight.

Furthermore, if necessary, a detergent dispersant, an antioxidant, an oiliness agent, an extreme pressure agent, a metal deactivator, an anticorrosive agent, an antifoaming agent, a viscosity index improver, and a pour point depressant are selected. It is preferable that the hydraulic fluid composition contains one or more additives described above.

Examples of the detergent dispersant include neutral or basic sulfonates such as petroleum sulfonic acid such as calcium petroleum sulfonate (normal salt) and basic barium sulfonate, and alkyl (C5-C36) substituted aromatic sulfonic acid. Or a basic metal salt thereof]; a neutral or basic phenate [for example, alkyl (C1-C36) phenol, alkyl (C1-C36) phenol sulfide, alkyl (C1-C36) phenol aldehyde Positive or basic metal salt of condensate, etc.]; Neutral or basic phosphonate, thiophosphonate; Alkyl (C1-C36) substituted salicylate; Alkyl (C5-C36) methacrylate or its methacrylate And polar groups (amine, amide, imide, hydroxyl, carboxyl, di Copolymer of a monomer containing Lil, etc.) (molar ratio 99/10/90) [for example, alkyl (number 1 to 36) methacrylates carbon - vinyl pyrrolidinone copolymer (weight average molecular weight: 1,000～100,
000), alkyl (C1-C36) methacrylate-diethylaminoethyl methacrylate copolymer (weight average molecular weight: 1,000-100,000), alkyl (C1-C36) methacrylate-polyethylene glycol-methacrylate copolymer (Weight average molecular weight:
1,000-100,000), etc.]; N-substituted alkenyl (C5-C36) succinimide (for example, N-tetraethylenepentamine polyisobutenyl succinimide, etc.); High molecular weight amide [for example, polystearamide] (Weight average molecular weight: 1,000 to 100,000) and the like] and the like. The amount of the detergent dispersant used is preferably 15% or less.

As the antioxidant, a phenolic antioxidant [eg, 2,4-dimethyl-6-tert-butylphenol, 4,4-butylidenebis (6-tert-butylmethacresol)]; amine antioxidant ( For example, monooctyldiphenylamine, dioctyldiphenylamine, etc.); dialkyl (C1-C36) zinc dithiophosphate; diallyl (C2-C36) zinc dithiophosphate; organic sulfides; organic selenides and the like. The amount of antioxidant used is preferably 2% or less.

As the oiliness agent, fats and oils such as lard oil; long-chain fatty acids having 8 to 36 carbon atoms (octylic acid, lauric acid,
(Palmitic acid, oleic acid, stearic acid, etc.) and these fatty acids and monohydric and polyhydric alcohol esters; higher alcohols having 8 to 36 carbon atoms (octyl alcohol, lauryl alcohol, palmityl alcohol, oleyl alcohol, stearyl alcohol, etc.) and The ester is mentioned. The amount of the oily agent used is preferably 15% or less.

As extreme pressure agents, lead soap (lead naphthenate, etc.); sulfur compounds (sulfurized fatty acid ester, sulfurized spum oil, terpene sulfide, dibenzyl disulphide, etc.);
Chlorine compounds (chlorinated paraffin, chloronaphthazanate, etc.); Phosphorus compounds (tricresyl phosphate, tributyl phosphate, tricresyl phosphite, n-
Butyl di-n-octyl phosphinate, di-n-butyl dihexyl phosphonate, di-n-butyl phenyl phosphonate, dibutyl phosphoroamidate, amine dibutyl phosphate and the like). The amount of the extreme pressure agent used is preferably 10% or less.

Examples of the metal deactivator include benzotriazole, mercaptobenzothiazole, N, N'-disalicylidene-1,2-diaminopropane and alizarin. The amount of the metal deactivator used is preferably 2% or less.

Examples of the rust preventive agent include aliphatic carboxylic acids having 6 to 36 carbon atoms (caprylic acid, lauric acid, nonanoic acid,
Decanoic acid, oleic acid, etc.) and alkali metal salts, amine salts; alkenyl succinic acids having 6 to 36 carbon atoms (octenyl succinic acid, dodecenyl succinic acid, pentadecenyl succinic acid, octadecenyl succinic acid, etc.) and alkali metal salts ,
Amine salt; dibasic acid having 6 to 24 carbon atoms (azelaic acid, sebacic acid dodecanedioic acid, dimer acid, etc.) and alkali metal salt, amine salt; aromatic carboxylic acid (benzoic acid,
(p-tert butylbenzoic acid, nitrobenzoic acid, etc.) and alkali metal salts, amine salts; (alkyl phosphate ester salts having 8 to 18 carbon atoms; (cyclo) alkylamine (1 carbon atom)
To 36) or a heterocyclic amine (C4 to C36) alkylene oxide (C2 to C4) (1 to 10 mol) adduct (eg, cyclohexylamine EO2 mol adduct, cyclohexylamine PO2 mol adduct, morpholine EO).
1 mol adduct, morpholine PO 1 mol adduct, etc.); Petroleum sulfonate; Alkyl (C1-C36) naphthalene sulfonate and sorbitan ester (eg, sorbitan laurate, sorbitan stearate, etc.); Examples thereof include alkenyl succinic acid, amides of dibasic acid with amine and ammonia, and the like. The amount of rust preventive used is preferably 5% or less.

Examples of the defoaming agent include polyorganosiloxane (eg polydimethylsiloxane).
The amount of defoaming agent used is preferably 0.1% or less.

Examples of the viscosity index improver include polyalkyl (C 1-18) methacrylate and polyalkyl (C 1-18) acrylate having a weight average molecular weight of 20,000 to 1,500,000; Mw of 5,000. ~ 300,
000 polyisobutylene; Mw 10,000 to 30
10,000 polyalkyl (8 to 12 carbon atoms) styrene; olefin (2 to 12 carbon atoms) copolymer [eg ethylene-propylene (molar ratio 5/95 to 95/5) copolymer, styrene-isoprene ( Molar ratio 5 / 95-95 /
5) Hydrogenated products of copolymers] and the like. The amount of the viscosity index improver used is preferably 15% or less.

As the pour point depressant, polyalkyl (C6-24) methacrylate; naphthalene-chlorinated paraffin condensation product; ethylene-vinyl acetate (molar ratio 5 / 95-95 / 5) copolymer; polyacrylamide Vinyl carboxylate (C1-C36) -dialkyl (C1-C36) fumarate (molar ratio 5/95
To 95/5) copolymers and the like. The weight average molecular weight of each of these pour point depressants is 1,000 to 10.
It is 10,000. The amount of pour point depressant used is preferably 1% or less.

The total content of the above additives is preferably 20% or less in the lubricating oil. Further, these additives may be used in combination of two or more kinds.

If necessary, an emulsifier such as a surfactant may be added to these to be diluted 1.1 to 100 times with water to be used as a water-containing hydraulic fluid such as an emulsion hydraulic fluid. Can be used. Unless otherwise specified, the amount of emulsifier added is the amount added to the base oil (polyether hydraulic oil or hydraulic oil that is a mixture of polyether hydraulic oil / hydrocarbon oil), and% is mass. Represents%.

Examples of emulsifiers include Na and K salts of sulfonic acids (alkylbenzenesulfonic acid, petroleum sulfonic acid, alkylnaphthalenesulfonic acid, etc.), and fatty acids (lauric acid, palmitic acid, myristic acid, oleic acid, castor oil fatty acid, etc.). Na, K salts and PEG esters obtained by esterifying these fatty acids with polyethylene glycol such as monoethanolamine, diethanolamine, triethanolamine and the like, and alcohols having 8 to 24 carbon atoms (octyl alcohol, decyl alcohol, dodecyl alcohol, tridecyl alcohol). Alcohol, tetradecyl alcohol, hexadecyl alcohol, oleyl alcohol, stearyl alcohol, etc.) ethylene oxide added nonionic activator, sorbitan fatty acid ester and ethylene thereof Nonionic surfactants such as by adding a Kisaido the like. The amount of emulsifier used is usually 30% or less.

The polyether hydraulic fluid of the present invention is used as a power transmission fluid for operating hydraulic equipment and devices in a wide range of construction machines, machine tools, metal and plastic processing machines, vehicles, ships, aircrafts and the like. be able to.

[0028]

The present invention will be described in detail with reference to the following examples, but the present invention is not limited thereto.

The test method is as follows. (1) Kinematic viscosity and viscosity index Measured according to JIS K 2283. (2) Compatible spindle oil [SYC spindle oil manufactured by Cosmo Oil Co., Ltd. The same applies hereinafter. ] Was evaluated by measuring the critical temperature. The critical temperature was 0 ° C to 85 ° C, and the hydraulic fluids of Examples and Comparative Examples were mixed with the above hydrocarbons in a test tube at a mass ratio of 30/70, and the temperature at which they were separated was measured. (3) Cleanability Aluminum petri dish (diameter: 5 cm) has a lubricating oil of 0.
5g was put and it hold | maintained at 300 degreeC for about 30 minutes. afterwards,
The appearance of the residue in the petri dish was visually observed. The evaluation criteria for high temperature cleanliness are as follows. ◯: Almost no residue such as carbides Δ: Some carbides remained ×: A large amount of carbides remained (4) Lubricating vibration friction wear tester (SRV tester) It was evaluated by observing the friction coefficient at the point contact with the disk and the wear scar diameter on the steel ball. <Lubricity test conditions> Vibration frequency: 50Hz Vibration width: 2mm Load: 200N, 300N, 500N Time: 10 minutes Temperature: 30 ° C Friction coefficient: Time 10 minutes Average value Wear diameter (mm): 10mm Steel ball (SUJ- 2) Oil film breakage: Changes in the friction coefficient (μ) were observed. ◯: Stable, Δ: Slightly fluctuated, × fluctuated. Unless otherwise specified, the parts in the text represent parts by mass.

Example 1 Isotridecanol [made by Kyowa Hakko Kogyo Co., Ltd .; trade name "Tridecanol"] in a glass autoclave. The same applies hereinafter. ] 200 parts (1.0 mol) and tetrahydrofuran (THF) 468 parts (6.5 mol) and BF3.THF
7.9 parts of was added, and 580 parts of PO (10.0 mol) was added dropwise from a pressure-resistant dropping funnel at 35 to 50 ° C. over 10 hours. Then, it reacted at 50 degreeC for 5 hours, and cooled. Further, after adding 4.8 parts of 48% NaOH aqueous solution, an adsorption treatment agent [Kyowa Chemical Industry Co., Ltd .; Kyoward 600 and Kyoward 1000]. The same applies hereinafter. ], Filtered, and dehydrated under reduced pressure at 30 mmHg or less to obtain 1120 parts (a1) of 6.5 mol of isotridecanol in THF / 10.0 mol of PO random adduct.

Example 2 A glass autoclave was charged with 130 parts (1.0 mol) of 2-ethylhexyl alcohol, 504 parts (7.0 mol) of THF and 7.9 parts of BF3.THF, and 580 parts of PO from a pressure-resistant dropping funnel ( 10.0 mol) 35-50
It was added dropwise at 10 ° C. over 10 hours. Then, it reacted at 50 degreeC for 5 hours, and cooled. Further, add 48% NaOH aqueous solution to 4.
After adding 8 parts, treated with an adsorption treatment agent, filtered,
After dehydration under reduced pressure at mHg or less, 1100 parts (a2) of 2-ethylhexyl alcohol in a THF 7.0 mol / PO 10.0 mol random adduct was obtained.

Example 3 In a glass autoclave, 200 parts (1.0 mol) of isotridecanol, 504 parts (7.0 mol) of THF and B were added.
7.9 parts of F3.THF was charged, and 580 parts of PO (10.0 mol) was dropped from a pressure-resistant dropping funnel at 35 to 50 ° C. over 10 hours. Then, it was aged at 50 ° C. for 5 hours and cooled. Further, after adding 4.8 parts of 48% NaOH aqueous solution, it was treated with an adsorption treatment agent, filtered, and dehydrated under reduced pressure at 30 mmHg or less. THF of the obtained isotridecanol
7.0 mol / PO 10.0 mol Random adduct 1220
Of the parts, 642 parts (0.5 mol) and 2.27 parts of KOH were charged in a glass autoclave, and 116 parts (2.0 mol) of PO was added dropwise from the pressure dropping funnel at 105 ° C. over 5 hours. Then, it was made to react at 130 degreeC for 5 hours, and was cooled. Further treated with adsorption treatment agent, filtered, 30mmH
After dehydration under reduced pressure below g, THF of isotridecanol 7.
689 parts (a3) of 0 mol / PO10.0 mol random PO4.0 mol block adduct were obtained.

Example 4 30 parts of (a1) and 70 parts of spindle oil were mixed,
100 parts (a4) of a mixture of (a1) and spindle oil was obtained.

Example 5 30 parts of (a1) and 70 parts of polybutene [Nisseki Polybutene LV-25E manufactured by Nippon Petrochemical Co., Ltd.] were mixed,
100 parts (a5) of a mixture of 1) and polybutene were obtained.

Comparative Example 1 Isotridecanol (200 parts, 1.0 mol) and KOH (3.3 parts) were charged into a glass autoclave, and PO1102 parts (19.0 mol) were added from a pressure-resistant dropping funnel at 105 ° C. for 33 hours. Dropped. Then, it was made to react at 130 degreeC for 10 hours, and was cooled. Further, it was treated with an adsorption treatment agent, filtered, and dehydrated under reduced pressure at 30 mmHg or less to obtain 1184 parts (b1) of a PO19.0 mol adduct of isotridecanol.

Comparative Example 2 74 parts of n-butanol (1.
0 mol) and 1.1 parts of KOH were charged, and EO704.0 parts (16.0 mol) and PO707.6 were introduced from a pressure resistant dropping funnel.
A mixture of parts (12.2 mol) was added dropwise at 110 ° C. over 15 hours. Then, it was made to react at 130 degreeC for 10 hours, and was cooled. After cooling, treat with adsorption treatment agent, filter,
After dehydration under reduced pressure at mHg or less, n-butanol EO16.
1340 parts (b2) of 0 mol / PO12.2 mol random adduct were obtained.

Comparative Example 3 The spindle oil was used as the hydraulic fluid (b3) of Comparative Example 3.

Comparative Example 4 Polybutene [manufactured by Nippon Petrochemical Co., Ltd .; trade name "Nisseki Polybutene LV-25E"] was used as the hydraulic fluid (b4) of Comparative Example 4.

Test Examples The hydraulic oils a1 to a5 of the above Examples and Comparative Examples are as follows.
And b1 to b4 as main items of hydraulic fluid (number average molecular weight, HLB, kinematic viscosity at 40 ° C., kinematic viscosity at 100 ° C., viscosity index, 200N indicating the lubricity, 30
Tables 1 and 2 show the physical properties of the friction coefficient under a load of 0 N and 500 N, the wear scar diameter and the oil film breakage, the critical temperature at which the lubricating oil separates, which represents the compatibility with hydrocarbons, and the high temperature detergency.

[0040]

[Table 1]

[0041]

[Table 2]

[0042]

EFFECTS OF THE INVENTION The polyether hydraulic fluid of the present invention has excellent compatibility with hydrocarbons such as mineral oil, and has excellent lubricity, viscosity index, and high-temperature detergency, and is therefore extremely suitable as a hydraulic fluid. is there.

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Claims (5)

[Claims] 1. A compound represented by the following general formula (1), having an HLB of 6.0 or less and a number average molecular weight of 500 to 30,000.
A hydraulic fluid consisting of polyether (E). R ¹ -{(OCH ₂ CH ₂ CH ₂ CH ₂ ) m (OA) n} -OH (1) [wherein R ¹ is a hydrocarbon group having 1 to 24 carbon atoms, and A is 1,4-
An alkylene group having 2 to 4 carbon atoms excluding a butylene group,
m and n have a number average molecular weight of (E) of 500 to 30,0.
It is an integer of 1 or more, which is 00. ] 2. The (OCH₂CH₂CH₂CH₂) Content
But (OCH₂CH₂CH ₂CH₂) And (OA) content
The hydraulic operation according to claim 1, which is 5 to 45 mol% of the measured amount.
oil. 3. The (OCH ₂ CH ₂ CH ₂ CH ₂ ) and (OCH ₂ CH ₂ CH ₂ CH ₂ ).
The hydraulic fluid according to claim 1, wherein the connection of A) includes a random connection. 4. The hydraulic fluid according to claim 1, further containing 5 to 90% by mass of a hydrocarbon base oil. 5. A detergent dispersant, an antioxidant, an oiliness agent, an emulsifier, an extreme pressure agent, a metal deactivator, a rust inhibitor, an antifoaming agent, a viscosity index improver and a pour point depressant. The hydraulic fluid according to any one of claims 1 to 4, which contains one or more additives selected.