JPH09104890A - Water-containing hydraulic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject liquid imparted with flame-retardancy and having excellent lubricity, metal-abrasion resistance and durability by dispersing a relatively large amount of water in transparent state in a mixture containing a specific polyether, a mineral oil, a surfactant and water at respectively specific ratios. SOLUTION: This water-containing hydraulic fluid contains (A) 1-30wt.% (based on the total hydraulic fluid) of a polyether of formula I and/or II R<1> and R<4> are each an 8-30C alkyl, alkenyl, etc.; R<2> , R<5> and R<6> are each H, a 1-30C alkyl, etc; X is O, S, etc,; E is ethylene; A<1> to A<3> are each a 3-4C alkylene; (a) is 0-100; (b) is 20-30; [(EO)a /(A<1> O)b ], [(EO)c /(A<2> O)d ] and [(EO)e /(A<3> O)4 ] are each a polyoxyalkylene produced by the random copolymerization or block copolymerization of oxyethylene unit and oxyalkylene unit}, (B) 40-60wt.% of a mineral oil, (C) 15-30wt.% of a surfactant and (D) 15-30wt.% of water. The component C is preferably a combination of a nonionic surfactant having an HLB of 1-10 with an anionic surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water-containing hydraulic fluid. More specifically, the present invention relates to a water-containing hydraulic fluid that contains a relatively large amount of water as a transparent dispersion in a lubricating base oil to make it flame-retardant and has excellent lubricity, metal abrasion resistance, and durability.

[0002]

2. Description of the Related Art Conventional mineral oil-based hydraulic oils have a mineral oil as a base oil and are added with an oil-soluble extreme pressure agent, an antiwear agent, etc., and the hydraulic pump has good wear resistance. Risk of fire if used near sources of fire. In such places, flame-retardant hydraulic fluids such as water and glycol are used, but these are more expensive than mineral oils, and wastewater treatment is poor, which may cause environmental pollution. For,
It has not become widespread. It is also flame retardant,
Moreover, since the wastewater treatment is easy, a W / O type working liquid containing a large amount of water has been commercialized. But,
It was generally difficult to obtain an emulsion having good stability. On the other hand, a transparent water-containing lubricant containing water (Japanese Patent Publication No. 60-6991) has also been proposed, but a large amount of a surfactant must be used for this. In addition, since there are no antiwear agents or extreme pressure agents suitable for water-containing systems, the antiwear agents and extreme pressure agents used in mineral oil-based hydraulic fluids are used in place of the antiwear agents and extreme pressure agents. was there.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a relatively large amount of water is transparently dispersed in a base oil such as a low-priced mineral oil to make it flame-retardant, and the water-containing operation is excellent in abrasion resistance and durability. The purpose is to provide a liquid.

[0004]

The present inventors have arrived at the present invention as a result of intensive research to develop a water-containing hydraulic fluid having excellent lubricity such as abrasion resistance and durability. That is, the present invention is based on the total amount of hydraulic fluid, (A) a polyether represented by the following general formula (1) and / or (2), 1 to 30 mass%, R ¹ -X-[(EO) _a / (A ¹ O) _b ] -R ² (1) [In the formula (1), R ¹ is an alkyl group or an alkenyl group having 8 to 30 carbon atoms, or a monoalkylphenyl group having an alkyl group having 8 to 24 carbon atoms, or Represents a dialkylphenyl group, R ² represents a hydrogen atom or an alkyl group or an alkenyl group having 1 to 30 carbon atoms, X represents an oxygen atom, a sulfur atom or a group represented by —NR ³ — (R ³ represents 1 carbon atom; To 30 alkyl groups or alkenyl groups)
, E represents an ethylene group, A ¹ represents an alkylene group having 3 to 4 carbon atoms, a is 0 to 100, and b is 20 to 30.
Each represents an integer of 0, and also [(EO) _a / (A
¹ O) _b ] represents a polyoxyalkylene group in which a mole of oxyethylene group EO and b mole of oxyalkylene group A ¹ O are randomly copolymerized or block copolymerized] [In the formula (2), R ⁴ represents an alkyl group or an alkenyl group having 8 to 30 carbon atoms or a monoalkylphenyl group or a dialkylphenyl group having an alkyl group having 8 to 24 carbon atoms, and R ⁵ and R ⁶ are different from each other. Represents a hydrogen atom or an alkyl group or an alkenyl group having 1 to 30 carbon atoms, E represents an ethylene group, A ² and A ³ each independently represent an alkylene group having 3 to 4 carbon atoms, and c represents 0 to 100, d is 1 to 299, e is 0 to 100, f is 1 to 299,
And an integer of c + e = 0 to 100 and d + f = 20 to 300, respectively, and [(EO) _c / (A ² O) _d ].
Is a polyoxyalkylene group obtained by random copolymerization or block copolymerization of c moles of oxyethylene group EO and d moles of oxyalkylene group A ² O, [(EO) _e / (A ³
O) _f ] represents a polyoxyalkylene group obtained by random copolymerization or block copolymerization of e moles of oxyethylene group EO and f moles of oxyalkylene group A ³ O.]
(B) mineral oil, 40 to 60% by mass, (C) surfactant,
15-30% by mass, and (D) water, 15-30% by mass
The present invention provides a water-containing hydraulic fluid characterized by containing.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The polyether (A) of the present invention is
It is a compound represented by the general formula (1) and / or (2). In the polyether represented by the general formula (1) of the present invention, R ¹ is a linear or branched alkyl group or alkenyl group having 8 to 30 carbon atoms, or 8 to 2 carbon atoms.
4 represents a monoalkylphenyl group or a dialkylphenyl group having a linear or branched alkyl group of 4. Specific examples of the linear or branched alkyl group or alkenyl group having 8 to 30 carbon atoms include a linear or branched octyl group, a linear or branched nonyl group,
Straight-chain or branched decyl group, straight-chain or branched undecyl group, straight-chain or branched dodecyl group, straight-chain or branched tridecyl group, straight-chain or branched tetradecyl group, straight-chain or branched Pentadecyl group, straight-chain or branched hexadecyl group, straight-chain or branched heptadecyl group, straight-chain or branched octadecyl group, straight-chain or branched nonadecyl group, straight-chain or branched icosyl group, direct Chain or branched henicosyl group, straight chain or branched docosyl group, straight chain or branched tricosyl group, straight chain or branched tetracosyl group, straight chain or branched pentacosyl group, straight chain or branched chain Hexacosyl group, linear or branched heptacosyl group,
Straight-chain or branched alkyl groups such as straight-chain or branched octacosyl groups, straight-chain or branched triacontyl groups; straight-chain or branched octenyl groups, straight-chain or branched nonenyl groups, straight-chain or branched Decenyl group, straight-chain or branched dodecenyl group, straight-chain or branched tridecenyl group, straight-chain or branched tetradecenyl group, straight-chain or branched pentadecenyl group, straight-chain or branched hexadecenyl group, straight-chain Or a branched heptadecenyl group, a straight-chain or branched octadecenyl group, a straight-chain or branched nonadecenyl group, a straight-chain or branched icosenyl group, a straight-chain or branched henicosenyl group, a straight-chain or branched docosenyl group Groups, straight chain or branched tricosenyl groups, straight chain or branched tetracosenyl groups, straight chain or branched octadecadienyl groups, such as straight chain or branched chain Alkenyl group; and the like. Having a linear or branched alkyl group having 8 to 24 carbon atoms,
Specific examples of the monoalkylphenyl group or dialkylphenyl group include linear or branched (mono,
Di) octylphenyl groups, straight or branched (mono, di)
Nonylphenyl group, linear or branched (mono, di) decylphenyl group, linear or branched (mono, di) undecylphenyl group, linear or branched (mono, di) dodecylphenyl group, linear or Branched (mono, di) tridecylphenyl group, linear or branched (mono, di) tetradecylphenyl group, linear or branched (mono, di) pentadecylphenyl group, linear or branched (mono, Di) hexadecylphenyl group, linear or branched (mono, di) heptadecylphenyl group, linear or branched (mono, di) octadecylphenyl group, linear or branched (mono, di) nonadecylphenyl group , A linear or branched (mono, di) icosylphenyl group,
Straight or branched (mono, di) henicosylphenyl group,
A straight-chain or branched (mono, di) docosylphenyl group, a straight-chain or branched (mono, di) tricosylphenyl group, a straight-chain or branched (mono, di) tetracosylphenyl group and the like can be mentioned. Of these, preferred as R ¹ is a linear or branched alkyl group or alkenyl group having 12 to 22 carbon atoms, and specific examples thereof include lauryl group, myristyl group, cetyl group, stearyl group, and isostearyl. Group, n-dodecenyl group, oleyl group, linole group and the like. Of these, R ¹ is particularly preferably a linear or branched alkyl group or alkenyl group having 16 to 18 carbon atoms, and specific examples thereof include a cetyl group, a stearyl group, an isostearyl group and an oleyl group. Is mentioned.

In the polyether represented by the general formula (1), R ² represents a hydrogen atom or a linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms. Specific examples of the linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group,
n-butyl group, isobutyl group, sec-butyl group, te
an rt-butyl group, a linear or branched pentyl group, a linear or branched hexyl group, a linear or branched heptyl group,
Linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, linear or branched undecyl group, linear or branched dodecyl group, linear or branched A tridecyl group, a linear or branched tetradecyl group,
Straight-chain or branched pentadecyl group, straight-chain or branched hexadecyl group, straight-chain or branched heptadecyl group, straight-chain or branched octadecyl group, straight-chain or branched nonadecyl group, straight-chain or branched Icosyl group, straight-chain or branched henicosyl group, straight-chain or branched docosyl group, straight-chain or branched tricosyl group, straight-chain or branched tetracosyl group, straight-chain or branched pentacosyl group, direct Linear or branched chain or branched hexacosyl group, linear or branched heptacosyl group, linear or branched octacosyl group, linear or branched nonacosyl group, linear or branched triacontyl group, etc. An alkyl group of: a straight-chain or branched propenyl group, a straight-chain or branched butenyl group, a straight-chain or branched pentenyl group, a straight-chain or branched hexenyl group,
Straight-chain or branched heptenyl group, straight-chain or branched octenyl group, straight-chain or branched nonenyl group, straight-chain or branched decenyl group, straight-chain or branched dodecenyl group, straight-chain or branched Tridecenyl group, straight-chain or branched tetradecenyl group, straight-chain or branched pentadecenyl group, straight-chain or branched hexadecenyl group, straight-chain or branched heptadecenyl group, straight-chain or branched octadecenyl group, Chain or branched nonadecenyl group, straight chain or branched icosenyl group, straight chain or branched henicosenyl group, straight chain or branched docosenyl group, straight chain or branched tricosenyl group, straight chain or branched chain Tetracocenyl group, linear or branched pentacocenyl group, linear or branched hexacocenyl group, linear or branched heptacocenyl group, linear or branched octacocene group And the like; sulfonyl group, a linear or branched Nonakoseniru group, a linear or branched thoria Conte group, straight-chain or branched alkenyl groups such as straight or branched octadecadienyl group. Of these, R ²
Is preferably a hydrogen atom or a linear or branched alkyl group or alkenyl group having 1 to 18 carbon atoms, and specific examples thereof include a hydrogen atom, a methyl group, an ethyl group, an n-propyl group and an isopropyl group. , Allyl group, n-
Butyl group, isobutyl group, sec-butyl group, tert
-Butyl group, n-pentyl group, n-hexyl group, isohexyl group, n-heptyl group, isoheptyl group, n-octyl group, 2-ethylhexyl group, n-nonyl group, n-decyl group, n-undecyl group, Examples thereof include a lauryl group, a cetyl group, a stearyl group, an isostearyl group, an n-dodecenyl group, an oleyl group and a linol group. Of these,
Particularly preferred R ² is a hydrogen atom or a carbon number of 1.
4 are linear or branched alkyl groups, specifically, for example, hydrogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group,
Examples thereof include sec-butyl group and tert-butyl group.

In the polyether represented by the general formula (1), X is an oxygen atom (--O--), a sulfur atom (--S--) or a group represented by --NR ^3- , wherein R ³ is It represents a linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms. Specific examples of R ³ include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, linear or branched pentyl. Group, straight-chain or branched hexyl group, straight-chain or branched heptyl group, straight-chain or branched octyl group, straight-chain or branched nonyl group, straight-chain or branched decyl group, straight-chain or Branched undecyl group, straight-chain or branched dodecyl group, straight-chain or branched tridecyl group, straight-chain or branched tetradecyl group, straight-chain or branched pentadecyl group, straight-chain or branched hexadecyl group , A straight-chain or branched heptadecyl group, a straight-chain or branched octadecyl group, a straight-chain or branched nonadecyl group, a straight-chain or branched icosyl group, a straight-chain or branched henicosyl group, a straight-chain or branched branch Docosyl group, a linear or branched tricosyl group, straight or branched tetracosyl group, straight or branched pentacosyl group,
Straight-chain or branched hexacosyl group, straight-chain or branched heptacosyl group, straight-chain or branched octacosyl group, straight-chain or branched nonacosyl group, straight-chain or branched triacontyl group, etc. A branched alkyl group; a straight chain or branched propenyl group, a straight chain or branched butenyl group,
Straight-chain or branched pentenyl group, straight-chain or branched hexenyl group, straight-chain or branched heptenyl group, straight-chain or branched octenyl group, straight-chain or branched nonenyl group, straight-chain or branched Decenyl group, straight-chain or branched dodecenyl group, straight-chain or branched tridecenyl group, straight-chain or branched tetradecenyl group, straight-chain or branched pentadecenyl group, straight-chain or branched hexadecenyl group, Chain or branched heptadecenyl group, straight chain or branched octadecenyl group, straight chain or branched nonadecenyl group, straight chain or branched icosenyl group, straight chain or branched henicosenyl group, straight chain or branched chain Docosenyl group, linear or branched tricosenyl group, linear or branched tetracosenyl group,
Linear or branched pentacocenyl group, linear or branched hexacocenyl group, linear or branched heptacocenyl group, linear or branched octacocenyl group, linear or branched nonacocenyl group, linear or branched And a straight-chain or branched alkenyl group such as a straight-chain or branched octadecadienyl group; Of these, preferred as R ³ is a linear or branched alkyl group or alkenyl group having 1 to 18 carbon atoms, specifically, for example, methyl group, ethyl group, n-propyl group, isopropyl group. , Allyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group,
n-pentyl group, n-hexyl group, isohexyl group, n
-Heptyl group, isoheptyl group, n-octyl group, 2-
Ethylhexyl group, n-nonyl group, n-decyl group, n-
Undecyl group, lauryl group, cetyl group, stearyl group,
Examples thereof include isostearyl group, n-dodecenyl group, oleyl group, and linole group. Of these, R ³ is particularly preferably a linear or branched alkyl group having 1 to 4 carbon atoms, and specific examples thereof include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and an n group. -Butyl group,
Examples thereof include an isobutyl group, sec-butyl group, tert-butyl group and the like. Further, among these, a group represented by an oxygen atom (—O—) or —NR ³ — (R ³ is a straight chain or branched chain having 1 to 18 carbon atoms is preferable as X represented by the general formula (1). Is an alkyl group or an alkenyl group), and an oxygen atom (—O—) or a group represented by —NR ³ — (R ³ is a linear or branched alkyl group having 1 to 4 carbon atoms) is particularly preferable. It shows a group).

In the polyether represented by the general formula (1), E represents ethylene, and the number of moles a of the oxyethylene group EO added is an integer of 0 to 100, preferably 0 to 100.
It is an integer of 10. In the polyether represented by the general formula (1), A ¹ represents an alkylene group having 3 to 4 carbon atoms. Specific examples of the alkylene group having 3 to 4 carbon atoms include a propylene group (methylethylene group), trimethylene group, butylene group (ethylethylene group), methyltrimethylene group and tetramethylene group. Of these, preferred as A ¹ are propylene group (methylethylene group) and butylene group (ethylethylene group).
And particularly preferred is a propylene group (methylethylene group). The number of moles b of the added oxyalkylene group A ¹ O is an integer of 20 to 300, preferably 30 to
It is an integer of 200. In the polyether represented by the general formula (1), [(EO) _a / (A ¹ O) _b ] is a random copolymer of a mole oxyethylene group EO and b mole oxyalkylene group A ¹ O. A block-copolymerized polyoxyalkylene group is shown. Preferred specific examples include a polyoxypropylene group obtained by homopolymerization of propylene oxide, a polyoxybutylene group obtained by homopolymerization of butylene oxide, a poly (oxypropylene-oxybutylene) group obtained by random copolymerization of propylene oxide and butylene oxide, and ethylene oxide. Examples thereof include a poly (oxyethylene-oxypropylene) group obtained by block copolymerization of propylene oxide and a poly (oxyethylene-oxypropylene-oxybutylene) group obtained by ternary block copolymerization of ethylene oxide, propylene oxide and butylene oxide.

In the polyether represented by the general formula (1), the numbers of a and b are arbitrary as long as they satisfy the ranges specified above, but they are particularly excellent in the effect of reducing friction and the effect of preventing wear. Therefore, b / (a + b) is preferably 0.7 to 1.0, and more preferably 0.9 to 1.0. When b / (a + b) is less than 0.7, there is a concern that the friction reducing effect and the wear preventing effect may be reduced.

The number average molecular weight of the polyether represented by the general formula (1) is arbitrary as long as a and b satisfy the ranges defined above, but it is particularly excellent in the friction reducing effect and the abrasion preventing effect. From the viewpoint, the number average molecular weight is preferably 1500 to 30000, more preferably 2000 to 10000, and particularly preferably 2000 to 50.
00. When the number average molecular weight is less than 1500, there is a concern that the friction reducing effect and the wear preventing effect may be reduced.

On the other hand, in the polyether represented by the general formula (2) of the present invention, R ⁴ is a linear or branched alkyl or alkenyl group having 8 to 30 carbon atoms, or 8 to 24 carbon atoms. A monoalkylphenyl group or a dialkylphenyl group having a linear or branched alkyl group is shown. Specific examples of the straight chain or branched alkyl group or alkenyl group having 8 to 30 carbon atoms include a straight chain or branched octyl group, a straight chain or branched nonyl group, a straight chain or branched chain. Decyl group, straight chain or branched undecyl group, straight chain or branched dodecyl group, straight chain or branched tridecyl group, straight chain or branched tetradecyl group, straight chain or branched pentadecyl group, straight chain Or a branched hexadecyl group, a straight-chain or branched heptadecyl group, a straight-chain or branched octadecyl group, a straight-chain or branched nonadecyl group, a straight-chain or branched icosyl group, a straight-chain or branched henicosyl group Group, straight-chain or branched docosyl group, straight-chain or branched tricosyl group, straight-chain or branched tetracosyl group, straight-chain or branched pentacosyl group, straight-chain or branched hexacosyl group, straight chain Or a straight-chain or branched alkyl group such as a branched heptacosyl group, a straight-chain or branched octacosyl group, a straight-chain or branched triacontyl group; a straight-chain or branched octenyl group, a straight-chain or branched Nonenyl group, linear or branched decenyl group, linear or branched dodecenyl group, linear or branched tridecenyl group, linear or branched tetradecenyl group, linear or branched pentadecenyl group, linear or branched A branched hexadecenyl group, a straight-chain or branched heptadecenyl group, a straight-chain or branched octadecenyl group, a straight-chain or branched nonadecenyl group, a straight-chain or branched icosenyl group, a straight-chain or branched henicosenyl group, Straight-chain or branched docosenyl group, straight-chain or branched tricosenyl group, straight-chain or branched tetracosenyl group, straight-chain or branched octadecadi Linear or branched alkenyl group such as alkenyl group; and the like. Examples of the monoalkylphenyl group or dialkylphenyl group having a linear or branched alkyl group having 8 to 24 carbon atoms include, for example, a linear or branched (mono, di) octylphenyl group and a linear chain. Or a branched (mono, di) nonylphenyl group, a straight chain or branched (mono, di) decylphenyl group, a straight chain or branched (mono,
Di) undecylphenyl group, straight or branched (mono,
Di) dodecylphenyl group, straight or branched (mono, di)
Tridecylphenyl group, linear or branched (mono, di) tetradecylphenyl group, linear or branched (mono, di) pentadecylphenyl group, linear or branched (mono, di) hexadecylphenyl group, Straight-chain or branched (mono, di) heptadecylphenyl group, straight-chain or branched (mono, di) octadecylphenyl group, straight-chain or branched (mono, di) nonadecylphenyl group, straight-chain or branched ( Mono, di) icosylphenyl group, straight-chain or branched (mono, di) henicosylphenyl group, straight-chain or branched (mono, di) docosylphenyl group, straight-chain or branched (mono, di) Examples thereof include a tricosylphenyl group and a straight chain or branched (mono, di) tetracosylphenyl group. Of these, preferred as R ⁴ is a linear or branched alkyl group or alkenyl group having 12 to 22 carbon atoms, and specific examples thereof include lauryl group, myristyl group, cetyl group, stearyl group, and isostearyl. Group, n-dodecenyl group, oleyl group, linole group and the like. Of these, R ⁴ is particularly preferably a linear or branched alkyl group or alkenyl group having 16 to 18 carbon atoms, and specific examples thereof include a cetyl group, a stearyl group, an isostearyl group and an oleyl group. Is mentioned.

In the polyether represented by the general formula (2), R ⁵ and R ⁶ separately represent a hydrogen atom or a linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms. . Specific examples of the linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms include methyl group, ethyl group, n-propyl group,
Isopropyl group, n-butyl group, isobutyl group, sec
-Butyl group, tert-butyl group, straight-chain or branched pentyl group, straight-chain or branched hexyl group, straight-chain or branched heptyl group, straight-chain or branched octyl group, straight-chain or branched Nonyl group, straight-chain or branched decyl group, straight-chain or branched undecyl group, straight-chain or branched dodecyl group, straight-chain or branched tridecyl group, straight-chain or branched tetradecyl group, direct Chain or branched pentadecyl group, straight chain or branched hexadecyl group, straight chain or branched heptadecyl group, straight chain or branched octadecyl group, straight chain or branched nonadecyl group, straight chain or branched chain Icosyl group, straight-chain or branched henicosyl group, straight-chain or branched docosyl group, straight-chain or branched tricosyl group, straight-chain or branched tetracosyl group, straight-chain or branched pentacosyl group, straight-chain Or A straight-chain or branched alkyl group such as a branched hexacosyl group, a straight-chain or branched heptacosyl group, a straight-chain or branched octacosyl group, a straight-chain or branched nonacosyl group, or a straight-chain or branched triacontyl group. ;
Straight-chain or branched propenyl group, straight-chain or branched butenyl group, straight-chain or branched pentenyl group, straight-chain or branched hexenyl group, straight-chain or branched heptenyl group, straight-chain or branched Octenyl group, straight-chain or branched nonenyl group, straight-chain or branched decenyl group, straight-chain or branched dodecenyl group, straight-chain or branched tridecenyl group, straight-chain or branched tetradecenyl group, Chain or branched pentadecenyl group, straight chain or branched hexadecenyl group, straight chain or branched heptadecenyl group, straight chain or branched octadecenyl group, straight chain or branched nonadecenyl group, straight chain or branched chain Icosenyl group, straight-chain or branched henicosenyl group, straight-chain or branched docosenyl group, straight-chain or branched tricosenyl group, straight-chain or branched tetracosenyl group, straight-chain or A branched pentacocenyl group, a linear or branched hexacocenyl group, a linear or branched heptacocenyl group, a linear or branched octacocenyl group, a linear or branched nonacocenyl group, a linear or branched triacontene group And a straight-chain or branched alkenyl group such as a straight-chain or branched octadecadienyl group; and the like. Of these, preferred as R ⁵ and R ⁶ are independently a hydrogen atom or a linear or branched alkyl group or alkenyl group having 1 to 18 carbon atoms, specifically, for example, a hydrogen atom, methyl Group, ethyl group, n-propyl group, isopropyl group, allyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group,
n-pentyl group, n-hexyl group, isohexyl group, n
-Heptyl group, isoheptyl group, n-octyl group, 2-
Ethylhexyl group, n-nonyl group, n-decyl group, n-
Undecyl group, lauryl group, cetyl group, stearyl group,
Examples thereof include isostearyl group, n-dodecenyl group, oleyl group, and linole group. Of these, R ⁵ and R ⁶
Are particularly preferably a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms, and specifically, for example, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, isopropyl group. Group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group and the like.

In the polyether represented by the general formula (2), E represents ethylene. Further, the addition mole numbers c and e of the oxyethylene group EO are separately integers of 0 to 100, and preferably independently integers of 0 to 10.
Further, c + e is an integer of 0 to 100, preferably 0.
Is an integer of 10 to 10. In the polyether represented by the general formula (2), A ² and A ³ separately have 3 to 4 carbon atoms.
Is an alkylene group. Specific examples of the alkylene group having 3 to 4 carbon atoms include a propylene group (methylethylene group), trimethylene group, butylene group (ethylethylene group), methyltrimethylene group and tetramethylene group. Of these, preferred as A ² and A ³ are a propylene group (methylethylene group) and a butylene group (ethylethylene group) separately, and a propylene group (methylethylene group) is particularly preferred. The number of moles d of the oxyalkylene group A ² O and the number of moles f of the oxyalkylene group A ³ O are 1 to
An integer of 299, preferably separately from 1 to 199
Is an integer. Further, d + f is an integer of 20 to 300, preferably 30 to 200. In addition, in the polyether represented by the general formula (2), [(EO) _c
/ (A ² O) _d ] represents a polyoxyalkylene group in which c moles of oxyethylene group EO and d moles of oxyalkylene group A ² O are randomly copolymerized or block copolymerized,
[(EO) _e / (A ³ O) _f ] represents a polyoxyalkylene group obtained by random copolymerization or block copolymerization of e moles of oxyethylene group EO and f moles of oxyalkylene group A ³ O. Preferred specific examples are, separately, a polyoxypropylene group obtained by homopolymerization of propylene oxide, a polyoxybutylene group obtained by homopolymerization of butylene oxide, and a poly (oxypropylene-oxybutylene) group obtained by random copolymerization of propylene oxide and butylene oxide. , A poly (oxyethylene-oxypropylene) group obtained by block copolymerization of ethylene oxide and propylene oxide, and a poly (oxyethylene-oxypropylene-oxybutylene) group obtained by ternary block copolymerization of ethylene oxide, propylene oxide and butylene oxide. .

In the polyether represented by the general formula (2), the numbers of c, d, e and f are arbitrary as long as they satisfy the ranges defined above, but especially the friction reducing effect and the wear preventing effect. Is superior to (d +
f) / (c + d + e + f) is preferably 0.7 to 1.0, and more preferably 0.9 to 1.0. (D
When + f) / (c + d + e + f) is less than 0.7, there is a concern that the friction reducing effect and the wear preventing effect may be reduced.

The number average molecular weight of the polyether represented by the general formula (2) is arbitrary as long as c, d, e and f satisfy the ranges specified above, but especially the friction reducing effect and the wear prevention are obtained. The number average molecular weight is preferably 1500 to 30000, more preferably 2000 to 10000, and particularly preferably 200 from the viewpoint of excellent effect.
0 to 5000. When the number average molecular weight is less than 1500, there is a concern that the friction reducing effect and the wear preventing effect may be reduced.

The polyether (A) of the present invention is not only a single compound selected from the above-mentioned polyethers represented by the general formula (1) or (2) but also selected from these. A mixture of two or more compounds in any mixing ratio can also be preferably used.

As the mineral oil (B) in the present invention, for example, a lubricating oil fraction obtained by distilling crude oil under atmospheric pressure and vacuum distillation is subjected to solvent removal, solvent extraction, hydrogenolysis, solvent dewaxing, Examples include paraffinic mineral oils, naphthenic mineral oils, aromatic mineral oils, and mixed oils thereof, which are refined by appropriately combining catalytic dewaxing, hydrorefining, sulfuric acid washing, and purification treatment such as clay treatment. Further, the kinematic viscosity of the mineral oil (B) is arbitrary, but usually, the kinematic viscosity at 40 ° C. is 5 to 500 mm ² / s from the viewpoint of excellent stability and lubricity of a water-containing system.
Those of 5 to 150 mm ² / s are more preferably used.

Specific examples of the surfactant (C) in the present invention include nonionic surfactants and anionic surfactants. As the nonionic surfactant, more specifically, higher alcohol ethylene oxide adducts represented by polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, etc., polyoxyethylene nonylphenyl ether, polyoxyethylene nonylphenyl ether, Polyoxyethylene type ethers such as alkylphenol ethylene oxide adducts represented by oxyethylene dodecyl phenyl ether; polyoxyethylene type amines such as alkylamine ethylene oxide adducts represented by laurylamine ethylene oxide adduct, stearylamine ethylene oxide adduct, etc. Polyoxyethylene such as fatty acid ethylene oxide adduct represented by lauric acid ethylene oxide adduct, oleic acid ethylene oxide adduct, etc. Emission type esters and the like, and mixtures thereof. Among these, polyoxyethylene type ethers such as higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, and mixtures thereof are preferable as the nonionic surfactant, and polyoxyethylene oleyl ether, polyoxyethylene nonyl phenyl ether, and These mixtures are particularly preferably used. In addition, HLB of these nonionic surfactants
Although the value is arbitrary, the viscosity of the water-containing hydraulic fluid increases when a high HLB value is used, so that the HLB value is 1 to 10
Is preferred and 4 to 10 is more preferred. In addition, the HLB value of the nonionic surfactant here means that expressed by the Griffin method. Further, in the ethylene oxide adduct of the nonionic surfactant, in addition to ethylene oxide alone, other alkylene oxide having 3 to 4 carbon atoms, such as propylene oxide and butylene oxide, is less than 2 mol, preferably 10 mol of ethylene oxide. Those that are randomly added or block-added at a ratio of less than 1 mol are also included. Further, as the anionic surfactant, specifically, for example, a fatty acid having 12 to 30 carbon atoms, a polymerized fatty acid having 36 to 100 carbon atoms, an alkylbenzenesulfonic acid having 18 to 24 carbon atoms,
Petroleum sulfonic acid having 10 to 100 carbon atoms, 12 to 2 carbon atoms
4, salts of organic acids such as alkyl sulfonic acids, and mixtures of these salts. In addition, as salt,
More specifically, alkali metal salts such as lithium salt and sodium salt; ammonium salt; monoethanolamine salt, diethanolamine salt, triethanolamine salt,
Organic amine salts such as morpholine salt, dimethylaminoethanol salt and cyclohexylamine salt; and the like. Among these, anionic surfactants include organic amine salts of polymerized fatty acids having 36 to 100 carbon atoms and 10 carbon atoms.
~ 100 petroleum sulfonic acid sodium salt, carbon number 10
~ 100 organic amine salts of petroleum sulfonic acid, or a mixture thereof are preferably used, organic amine salts of polymerized fatty acids having 36 to 60 carbon atoms, sodium salts of petroleum sulfonic acid having 20 to 80 carbon atoms, and 20 to carbon atoms. Especially preferred are 80 organic amine salts of petroleum sulfonic acid, and mixtures thereof. As the surfactant (C) in the present invention, the above-mentioned nonionic surfactant, anionic surfactant, and a mixture thereof can be preferably used, but in particular, thickening or gelation of a water-containing working liquid. It is more preferable to use the nonionic surfactant and the anionic surfactant in combination, because the solubilized product which is stable from low temperature to high temperature can be obtained without causing the above phenomenon. The ratio of the nonionic surfactant and the anionic surfactant used in combination is arbitrary, but usually,
It is desirable to use the anionic surfactant in an amount of preferably 5 to 100 parts by weight, more preferably 5 to 50 parts by weight, based on 100 parts by weight of the nonionic surfactant.

In the present invention, the water (D) may be hard water or soft water, and therefore, tap water, industrial water, ion-exchanged water, distilled water or the like may be optionally used. it can.

The upper limit of the content of the polyether (A) in the present invention is 30% by mass, preferably 10% by mass, based on the total amount of the working fluid, while the lower limit is 1% by mass based on the total amount of the working fluid. %, Preferably 4% by mass. When the content of the polyether (A) exceeds 30% by mass, the stability of the hydrous working fluid becomes poor, while the content thereof is 1% by mass.
If it is less than the above range, the friction reducing effect and the wear preventing effect are deteriorated, which are not preferable. The upper limit of the content of mineral oil (B) in the present invention is 60 based on the total amount of hydraulic fluid.
On the other hand, the lower limit value is 40% by mass, preferably 45% by mass, based on the total amount of hydraulic fluid. When the content of the mineral oil (B) exceeds 60% by mass, the flame retarding effect is deteriorated, while when the content is less than 40% by mass, the friction reducing effect and the wear preventing effect are poor. Which is not preferable. Further, the upper limit of the content of the surfactant (C) in the present invention is 3 based on the total amount of the hydraulic fluid.
It is 0% by weight, preferably 25% by weight, while the lower limit is 15% by weight. The content of surfactant (C) is 30
When the content is more than mass%, the friction reducing effect and the wear preventing effect are adversely affected, while when the content is less than 15%, the stability of the water-containing hydraulic fluid is deteriorated, which is not preferable. Further, the upper limit of the content of water (D) in the present invention is 30% by mass, preferably 25% by mass on the basis of the total amount of hydraulic fluid, while the lower limit is 15% by mass, preferably on the basis of the total amount of hydraulic fluid. Is 20% by mass. When the upper limit of the content of water (D) exceeds 30% by mass, the friction reducing effect and the wear preventing effect decrease, while
If the content is less than 15% by mass, the effect of flame retardancy is poor, which is not preferable.

The water-containing hydraulic fluid of the present invention may optionally contain an antifoaming agent (eg, silicone type), a rust preventive (eg, benzotriazole type), an antioxidant (eg, hindered phenol type, aromatic amine type). , Oiliness improver, solid lubricant, p
H modifier (eg morpholine, cyclohexylamine)
Optional components such as can be added. Further, alkylene glycols such as propylene glycol, 1,3-butylene glycol, and hexylene glycol may be added, if necessary, in order to improve the appearance and fluidity at low temperature. The content of these optional components and the alkylene glycol in the water-containing hydraulic fluid of the present invention is arbitrary, but normally the total content of the optional components and the alkylene glycol is 10 mass% or less, preferably 5 mass, based on the total amount of the hydraulic fluid. %
It is preferable to mix them in the following proportions.

The order in which the polyether (A), the mineral oil (B), the surfactant (C) and the water (D) are mixed in preparing the water-containing hydraulic fluid of the present invention is not particularly limited, but is preferably. After blending polyether (A), mineral oil (B) and surfactant (C) and dissolving them uniformly, by blending water (D), a transparent hydrous working fluid without haze or turbidity is created. it can.

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

[0024]

EXAMPLES Examples 1 to 8 and Comparative Example 1 Using the components shown below, a water-containing hydraulic fluid having the composition shown in Table 1 was prepared. The appearance, solubilization, and shell 4-ball wear of this water-containing working fluid were evaluated, and the results are also shown in Table 1. [Polyether (A)] A: 30 mole adduct of oleyl alcohol propylene oxide (number average molecular weight from the hydroxyl value is 1750) B; Oleyl alcohol propylene oxide 48 mole adduct (number average molecular weight from hydroxyl value of 2800) C; Oleyl 40 moles of alcohol propylene oxide,
Ethylene oxide 6 mol adduct (number average molecular weight from hydroxyl value 2200) D; Nonylphenol propylene oxide 30 mol adduct (number average molecular weight from hydroxyl value 1800) E; Oleyl alcohol Propylene oxide 48 mol adduct terminal oleyl ether compound F 45 mol of stearylamine propylene oxide adduct (number average molecular weight from hydroxyl value 2800) [Mineral oil (B)] G; Paraffin-based refined mineral oil Kinematic viscosity 5.0 mm ² / s (@
40 ° C.) [Surfactant (C)] H: Polyoxyethylene nonylphenyl ether (ethylene oxide addition mole number = 2, HLB = 5.7) I: Polyoxyethylene nonylphenyl ether (ethylene oxide addition mole number = 4, HLB = 8.9) J; Polyoxyethylene alkyl ether Alkyl group = Secondary alkyl group having 12 to 14 carbon atoms (ethylene oxide addition mole number = 3, HLB = 7.
9) K; polyoxyethylene oleyl ether (ethylene oxide addition mole number = 5, HLB = 9.0) L; sodium salt of petroleum sulfonic acid having 12 to 50 carbon atoms M; morpholine salt of polymerized fatty acid having 18 to 54 carbon atoms [Water (D)] Tap water

[0025]

[Table 1]

[0026]

The water-containing hydraulic fluid of the present invention has flame retardancy, metal abrasion resistance, lubricity and durability, and is extremely useful as a hydraulic fluid.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area C10M 129: 16) C10N 40:08

Claims (3)

[Claims] 1. A polyether represented by the following general formula (1) and / or (2), based on the total amount of hydraulic fluid:
1-30 ^{wt%, R 1 -X - [(} EO) a / (A 1 O) b] -R 2 (1) [(1) wherein, R ¹ is alkyl or alkenyl of 8 to 30 carbon atoms Group or a monoalkylphenyl group or dialkylphenyl group having an alkyl group having 8 to 24 carbon atoms, R ² represents a hydrogen atom or an alkyl group or alkenyl group having 1 to 30 carbon atoms, and X represents an oxygen atom or a sulfur atom. Or a group represented by —NR ³ — (R ³ represents an alkyl group or an alkenyl group having 1 to 30 carbon atoms)
, E represents an ethylene group, A ¹ represents an alkylene group having 3 to 4 carbon atoms, a is 0 to 100, and b is 20 to 30.
Each represents an integer of 0, and also [(EO _a / (A ¹ O) _b ]]
Represents a polyoxyalkylene group obtained by random copolymerization or block copolymerization of a mole of oxyethylene group EO and b mole of oxyalkylene group A ¹ O] [In the formula (2), R ⁴ represents an alkyl group or an alkenyl group having 8 to 30 carbon atoms or a monoalkylphenyl group or a dialkylphenyl group having an alkyl group having 8 to 24 carbon atoms, and R ⁵ and R ⁶ are different from each other. Represents a hydrogen atom or an alkyl group or an alkenyl group having 1 to 30 carbon atoms, E represents an ethylene group, A ² and A ³ each independently represent an alkylene group having 3 to 4 carbon atoms, and c represents 0 to 100, d is 1 to 299, e is 0 to 100, f is 1 to 299,
And an integer of c + e = 0 to 100 and d + f = 20 to 300, respectively, and [(EO) _c / (A ² O) _d ].
Is a polyoxyalkylene group obtained by random copolymerization or block copolymerization of c moles of oxyethylene group EO and d moles of oxyalkylene group A ² O, [(EO) _e / (A ³
O) _f ] represents a polyoxyalkylene group obtained by random copolymerization or block copolymerization of e moles of oxyethylene group EO and f moles of oxyalkylene group A ³ O, respectively] (B) mineral oil, 40 to 60 mass% , (C) a surfactant, 15 to 30 mass%, and (D) water, 15 to 30 mass%. 2. b / (a + b) in the general formula (1) is 0.7 to 1.0, and (d + in the general formula (2).
The water-containing hydraulic fluid according to claim 1, wherein f) / (c + d + e + f) is 0.7 to 1.0. 3. The hydrous hydraulic fluid according to claim 1, wherein the surfactant (C) is a mixture of a nonionic surfactant having HLB 1 to 10 and an anionic surfactant.