JP2003041281A - Lubricating oil composition for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating oil composition for a compressor having a low carbon content and, simultaneously, good lubricity. SOLUTION: The lubricating oil composition for a compressor comprises at least one base oil to be selected from the group consisting of mineral oils, fats and oils, and synthetic oils, (A) an amine-based antioxidant, and (B) a zinc dithiophosphate compound.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a lubricating oil composition for a compressor.
Products, in particular, lubricating oil compositions for reciprocating compressors.
I do. [0002] 2. Description of the Related Art Compressors are air or gas (for example, nitrogen).
Gas, oxygen gas, ammonia gas, hydrocarbon gas, combustion
Exhaust gas, combustion gas, CO_TwoGas, CO gas) from outside
It is a machine that gives work, compresses it and sends it out.
Is a positive displacement or
And turbo type. Positive displacement compressor reciprocates further
Are classified into rotary compressors and rotary compressors. Especially reciprocating sky
In a gas compressor, compressed air is generated by reciprocating pistons.
The lubricating oil mixed into the air is
Carbonized and adheres around the valve, causing malfunction of the valve.
Problems often arise. Therefore reciprocating compression
Machine lubricating oils are difficult to produce and adhere to carbides (carbon).
That is, it is most important to have low carbon properties.
Required as an essential property. Conventionally a viscosity index of 100
These highly refined mineral oils have good oxidation stability and long life lubricating oils
Widely used as carbon
It is not suitable for reciprocating compressors. Also,
Synthetic lubricating oils such as α-olefins are highly refined mineral oils
Oxidation stability is better than lubricating oil, high-grade lubricating oil, etc.
Widely used for carbon production and adhesion
Is extremely undesirable. Therefore, currently mainly used
Lubricating oil for reciprocating compressors has a viscosity index of 100 or less.
Synthetic oils such as refined mineral oils and phthalates below are used as base oils.
In order to suppress the generation and adhesion of carbon,
An additive is blended. [0003] [Problems to be solved by the invention]
The lubricating oil for reciprocating compressors on the market has carbon
Performance is still unsatisfactory, although
The compressor discharge valve and discharge
Carbon gradually adheres to the outlet air piping, etc.
2,000 hours of continuous operation to open the device
Must be removed. Reduction of attached carbon
The maintenance interval of the equipment can be extended
Not only cost reduction, but also heat storage phenomenon of attached carbon
There is a big merit such as prevention of ignition by
For low-carbon reciprocating compressor lubrication oil
Have been. Furthermore, with the recent high performance of compressors,
Severe operation is performed due to increase in discharge pressure or discharge temperature.
It is becoming more frequent. Therefore, the reciprocating pressure
As a lubricating oil for compressors, it has low carbon
The need for higher lubricity
You. However, extreme pressure additives that improve lubricity
Low carbon and high lubrication, which tends to increase carbon
Nothing that balances sex has yet been obtained. Departure
The purpose of Akira is to have low carbon and good lubricity.
An object of the present invention is to provide a lubricating oil composition for a compressor. [0004] SUMMARY OF THE INVENTION The present invention relates to a mineral oil, a fat and oil, and
At least one base oil selected from the group consisting of
(A) an amine-based antioxidant, and (B) dithioline
Compressor characterized by containing zinc oxide compound
Lubricating oil composition. [0005] DESCRIPTION OF THE PREFERRED EMBODIMENTS The lubricating oil composition for a compressor of the present invention
Mineral oils, fats and oils, or synthetic oils are used as the base oil.
As the mineral oil, for example, crude oil is distilled under normal pressure and reduced pressure
Solvent is removed from the lubricating oil fraction obtained by distillation,
Agent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrogenation
One or more of purification, sulfuric acid washing, clay treatment, etc.
Paraffin obtained by appropriately combining purification methods
Mineral oils such as quinone or naphthenic oils.
You. The fats and oils include, for example, beef tallow, lard,
Soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm
Animal and vegetable fats and oils such as kernel oil, or hydrogenated products of them
Is mentioned. As the above synthetic oil, for example, poly-α-O
Refin (for example, ethylene-propylene copolymer,
Libutene, 1-octene oligomer, 1-decene oligo
Or hydrides of these)
Zen, alkyl naphthalene, monoester (for example,
Chill stearate, octyl laurate, etc.)
Ter (for example, ditridecyl glutarate, di-2-e
Tylhexyl adipate, diisodecyl adipate, di
Tridecyl adipate, di-2-ethylhexyl sepake
Polyester) (for example, trimellitic acid
Sterols), polyol esters (eg, trimethyl
Roll propane caprylate, trimethylol propane
Pelargonate, pentaerythritol-2-ethyl
Xanoate, pentaerythritol pelargonate
Etc.), polyoxyalkylene glycol, polyphenyl
Ether, dialkyl diphenyl ether, phosphoric acid S
Ter (for example, tricresyl phosphate), including
Fluorine compounds (for example, perfluoropolyether,
Fluorinated polyolefins), silicone oil, etc.
it can. [0008] In the present invention, one of the above base oils
May be used alone or in combination of two or more.
Is also good. A special limitation on the viscosity of the base oil used in the present invention
But the kinematic viscosity of the base oil at 40 ° C. is 800 mm^Two
/ S or less, preferably 500 mm^Two/ S or less
Is more preferable. Kinematic viscosity of base oil at 40 ℃
Degree is 800mm^Two/ S, the moisture in various machines
The lubricating oil supply tends to be insufficient. Also, at 40 ° C
Kinematic viscosity of base oil is 10mm^Two/ S or more
Preferably, 15mm^Two/ S is more preferable
No. Base oil viscosity at 40 ° C is 10mm^TwoLess than / s
If it is present, it will increase volatility, reduce safety and lubricate
The film tends to be thin and the sliding surface tends to seize. [0010] The content of the base oil in the lubricating oil composition of the present invention
Although there is no particular limitation, it is usually based on the total amount of the lubricating oil composition.
60 to 99.96% by mass, preferably 70 to 99.9
0% by mass. [0011] The lubricating oil composition for a compressor of the present invention is an essential component.
It contains (A) an amine-based antioxidant as an additive. (A) As an amine antioxidant, antioxidant for lubricating oil
Any aromatic amine compound used as an agent is used
It is possible and not particularly limited, for example,
Phenyl-α-naphthyl represented by the following general formula (1)
Amines and p, p'-dials represented by the general formula (2)
One or more selected from kildiphenylamine
The above aromatic amines are preferred. [0012] Embedded image In the general formula (1), R¹Is a hydrogen atom or a carbon number of 1 to
Indicate 16 alkyl groups. [0013] Embedded image In the general formula (2), R^TwoAnd R^ThreeAre individually
Shows an alkyl group having 1 to 16 carbon atoms. First, phenyl- represented by the general formula (1)
The α-naphthylamines will be described. General formula (1)
In, R¹Is a hydrogen atom or a linear group having 1 to 16 carbon atoms
Alternatively, it represents a branched alkyl group. R¹Has 1 carbon atom
If it exceeds 6, the proportion of functional groups in the molecule is small
And may adversely affect the carbon generation suppression effect
is there. R¹Specific examples of the alkyl group represented by
For example, methyl group, ethyl group, propyl group, butyl group,
Pentyl group, hexyl group, heptyl group, octyl group,
Nyl, decyl, undecyl, dodecyl, tridecyl
Group, tetradecyl group, pentadecyl group, and hexade
A sil group or the like (these alkyl groups may be linear or branched
Good). Among the compounds represented by the general formula (1), R
¹If is an alkyl group, better carbon formation
Since the suppression effect is obtained, R¹Has 8 to 16 carbon atoms
And a branched alkyl group having 3 or 4 carbon atoms
8-16 carbon atoms derived from olefin oligomers
Is more preferred. 3 or 4 carbon atoms
Specific examples of the fin include propylene and 1-butene.
Butane, 2-butene and isobutylene, but more
In order to obtain an excellent carbon production suppression effect,
Or isobutylene is preferred. Superior carbon raw material
In order to obtain the growth suppression effect, R¹Is the isobutylene 2
Octyl group derived from monomer, tertiary propylene
Nonyl group derived from the product, trimer of isobutylene
A branched dodecyl group derived from
Pentamer of branched dodecyl group or propylene derived therefrom
Branched pentadecyl groups derived from are even more preferred
Octyl derived from isobutylene dimer
Group, branched dodecyl derived from the trimer of isobutylene
Dodecyl groups derived from tetramers or propylene tetramers
The most preferred group is The aromatic amine represented by the general formula (1)
ChiR¹Is an alkyl group, the phenyl-α
-Commercially available naphthylamines may be used.
No. Further, a synthetic material may be used. The synthesized product has 1 to 1 carbon atoms.
16 alkyl halide compounds and phenyl-α-naph
Tylamine, or an olefin having 2 to 16 carbon atoms or
Olefin oligomer having 2 to 16 carbon atoms and phenyl-α
-Naphthylamine using Friedel-Crafts catalyst
Can be easily synthesized by reacting
You. Specific examples of Friedel Crafts catalyst
For example, metals such as aluminum chloride, zinc chloride, and iron chloride
Halide: sulfuric acid, phosphoric acid, phosphorus pentoxide, borofluoride
Acid catalysts such as hydrogen, acid clay, activated clay, etc .;
be able to. Next, p, p'- represented by the general formula (2)
The dialkyldiphenylamine will be described. R above
^TwoAnd R^ThreeAre each independently an alkyl having 1 to 16 carbon atoms
Represents a hydroxyl group. R^TwoAnd R^ThreeOne or both of the hydrogen atoms
In some cases settles itself as sludge due to oxidation
If the number of carbon atoms exceeds 16, the
Of the functional groups in the carbon
The effect may be adversely affected. R^TwoOr R^ThreeRepresented by
Examples of the alkyl group include a methyl group and an ethyl group.
Group, propyl group, butyl group, pentyl group, hexyl group,
Heptyl, octyl, nonyl, decyl, unde
Silyl, dodecyl, tridecyl, tetradecyl,
Antadecyl group, hexadecyl group, etc.
May be linear or branched). these
Above all R^TwoOr R^ThreeHas a better carbon generation suppression effect
To obtain a branched alkyl group having 3 to 16 carbon atoms.
And an olefin having 3 or 4 carbon atoms, or an olefin thereof.
C 3-16 branched alkyl derived from ligomer
Groups are more preferred. With the above olefin having 3 or 4 carbon atoms
Specifically, propylene, 1-butene, 2-butene
And isobutylene.
Propylene or isobutane
Tylene is preferred. Further, R^TwoOr R^ThreeIs a better carb
From propylene, respectively, in order to obtain
Derived isopropyl group, derived from isobutylene
Tert-butyl group, derived from propylene dimer
Branched hexyl groups, derived from dimers of isobutylene
Branched octyl groups, derived from propylene trimers
Branched nonyl group, derived from isobutylene trimer
A branched dodecyl group, a moiety derived from a tetramer of propylene
A component derived from a branched dodecyl group or a pentamer of propylene
Even more preferred is a branched pentadecyl group, isobutylene
Tert-butyl group derived from
Dimer of branched hexyl group and isobutylene derived from the body
Octyl group derived from the product, trimer of propylene
Is a branched nonyl group derived from a trimer of isobutylene
From a branched dodecyl group or a propylene tetramer derived therefrom
Most preferred are branched dodecyl groups derived therefrom. The p, p'-dial represented by the general formula (2)
Commercially available kildiphenylamine may be used. Ma
Alternatively, a synthetic compound may be used. The compound is represented by the general formula (1).
The same as phenyl-α-naphthylamine
1 to 16 alkyl halide compounds and diphenylamido
Olefin having 2 to 16 carbon atoms or 2 carbon atoms
Olefins or oligomers thereof with diphenylene
Reaction with fluoramine using a Friedel-Crafts catalyst.
By doing so, they can be easily synthesized. free
As the Del Crafts catalyst, specifically, for example,
Gold as listed in the synthesis of nyl-α-naphthylamine
A genus halide or an acidic catalyst is used. (A) Composition of the lubricating oil composition for a compressor of the present invention
Is a compound represented by the general formulas (1) and (2).
One selected from the above may be used alone, or may have a different structure.
A mixture of two or more kinds may be used. Better carbon
In order to obtain an effect of suppressing generation, it is represented by the general formula (1).
Phenyl-α-naphthylamines represented by general formula (2)
With p, p'-dialkyldiphenylamine
It is preferable to use Mixing ratio (mass ratio) in this case
Is optional, but must be in the range of 1/10 to 10/1.
Is preferred. In the lubricating oil composition for a compressor of the present invention,
Although the content of the component (A) is arbitrary, the upper limit
Preferably 10% by mass, more preferably based on the total amount of the composition
Is 5% by weight, more preferably 2% by weight, most preferably
Is 1% by mass. When its content exceeds 10% by mass
Also has the effect of suppressing carbon generation that is commensurate with its content.
Not only is there no significant improvement effect,
There is a risk of increasing the yield. On the other hand, the content of the component (A)
The lower limit of the amount is preferably 0.01% based on the total amount of the composition.
Mass%, more preferably 0.02 mass%, even more preferably
0.05% by weight, most preferably 0.1% by weight.
You. (A) When the content of the component is less than 0.01% by mass,
In this case, the addition effect is not seen,
May not be seen. The lubricating oil composition for a compressor of the present invention is an essential component.
Contains (B) a zinc dithiophosphate compound as an additive
You. (B) The zinc dithiophosphate compound is, specifically,
It is represented by general formula (3). [0023] Embedded image In the general formula (3), R^Ten, R¹¹, R¹²
And R¹³Is each independently an alkyl having 1 to 18 carbon atoms
Group, an aryl group having 6 to 18 carbon atoms or 7 to 18 carbon atoms
Represents an alkylaryl group. As the above alkyl group
Are specifically methyl, ethyl, propyl,
Group, pentyl group, hexyl group, heptyl group, octyl
Group, nonyl group, decyl group, undecyl group, dodecyl group,
Tridecyl, tetradecyl, pentadecyl, hex
Sadecyl group, heptadecyl group, octadecyl group, etc.
In general, an alkyl group having 3 to 8 carbon atoms is used.
These alkyl groups may be linear or branched.
included. These also include primary (primary) al
Includes both kill and secondary (secondary) alkyl groups
You. The above R^Ten, R¹¹, R¹²And R¹³Introduce
In some cases, a mixture of α-olefins may be used as the raw material
However, in this case, as the compound represented by the general formula (3),
Dialkyldithios having alkyl groups of different structures
It becomes a mixture of zinc phosphates. As the above aryl group, specifically,
Enyl group, naphthyl group and the like. The above alkyl
Specific examples of the reel group include a tolyl group and a xylyl group.
Group, ethylphenyl group, propylphenyl group, butylphenyl group
Phenyl, pentylphenyl, hexylphenyl,
Heptylphenyl group, octylphenyl group, nonylphen
Nil group, decylphenyl group, undecylphenyl group,
Decylphenyl group, etc. (these alkyl groups have
And branched ones, and all substituted isomers
Included). Specific Compound of Zinc Dithiophosphate Extreme Pressure Agent
As a substance, di (2-ethylhexyl) dithiophosphorous acid
Lead, zinc di (1,3-dimethylbutyl) dithiophosphate,
Zinc diisopropyldithiophosphate and mixtures thereof
And the like. In the lubricating oil composition for a compressor of the present invention,
Although the content of the component (B) is arbitrary, the upper limit
Preferably 5% by mass, more preferably based on the total amount of the composition
3% by weight, more preferably 1% by weight, most preferably
0.5% by mass. When its content exceeds 5% by mass
However, the further improvement effect of extreme pressure property that matches the content
Not seen, and increased carbon production and sludge
Is not preferred. On the other hand, the content of the component (B)
The lower limit is preferably 0.001 mass based on the total amount of the composition.
%, More preferably 0.01% by mass, even more preferably
Is 0.02% by mass, most preferably 0.05% by mass.
You. The content of the component (B) is less than 0.001% by mass.
In this case, the effect of adding
It is not preferable because pressure and lubricity may be deteriorated. The compressor lubricating oil composition of the present invention comprises (A)
Contains a min-based antioxidant as an essential component
However, when combined with a phenolic antioxidant, it is even better
Thus, an effect of suppressing carbon production can be obtained. Phenolic oxidation
Used as an antioxidant for lubricating oil
Any alkylphenol compound can be used,
For example, the following general formulas (4), (5), and
One selected from compounds represented by the formula (6) or
Preferred are two or more alkylphenol compounds.
It is mentioned. [0030] Embedded image In the general formula (4), R²⁰Has 1 to 1 carbon atoms
4 represents an alkyl group. R^{twenty one}Is a hydrogen atom or a carbon number of 1 to
4 represents an alkyl group. R^{twenty two}Is a hydrogen atom, having 1 to 4 carbon atoms
An alkyl group represented by the following general formula (i) or
It represents a group represented by the general formula (ii). [0032] Embedded image In the general formula (i), R^{twenty three}Has 1 to 1 carbon atoms
6 represents an alkylene group. R^{twenty four}Is an alkyl having 1 to 24 carbon atoms
Represents a kill group or an alkenyl group. [0034] Embedded image In the general formula (ii), R^{twenty five}Has 1 to 1 carbon atoms
6 represents an alkylene group. R²⁶Is alk having 1 to 4 carbon atoms
Represents a hydroxyl group. R²⁷Is a hydrogen atom or an alkyl having 1 to 4 carbon atoms
Represents a hydroxyl group. n is 0 or 1. [0036] Embedded image In the general formula (5), R³⁰And R³²Is
Each represents an alkyl group having 1 to 4 carbon atoms. R
³¹And R³³Are each independently a hydrogen atom or a carbon atom
And represents an alkyl group of 1 to 4. R³⁴And R³⁵Is an individual
Separately, an alkylene group having 1 to 6 carbon atoms is shown. A is carbon number
1 to 18 alkylene groups or represented by the following general formula (iii)
Shows the group to be formed. -R³⁶-SR³⁷− (Iii) In the general formula (iii), R³⁶And R³⁷Is an individual
Separately, an alkylene group having 1 to 6 carbon atoms is shown. [0038] Embedded image In the general formula (6), R⁴⁰Is carbon number 1
And represents an alkyl group of 1 to 4. R⁴¹Is a hydrogen atom or carbon
Shows the alkyl groups of Formulas 1 to 4. R⁴²Has 1 to 6 carbon atoms
An alkylene group or a group represented by the following general formula (iv)
You. [0040] Embedded imageIn the general formula (iv), R⁴³And R⁴⁴Is
Each of them independently represents an alkylene group having 1 to 6 carbon atoms. First, the phenol represented by the general formula (4)
The compound will be described. R above^{twenty two}Is represented by the formula (i).
In the case where the compound is a group represented by the formula:
^{twenty three}Is an alkylene group having 1 to 2 carbon atoms;^{twenty four}Is the carbon number
6 to 12 linear or branched alkyl groups are preferred.
More preferably, R in formula (i)^{twenty three}Has 1 to 2 carbon atoms.
A alkylene group, R^{twenty four}Is a branched alkyl having 6 to 12 carbon atoms
Those which are a kill group are particularly preferred. Preferred among the compounds represented by the general formula (4)
New things are listed. R^{twenty two}Is an alkyl group having 1 to 4 carbon atoms
Examples of the compound when is 2,6-di-ter
t-butyl-p-cresol, 2,6-di-tert-
Butyl-4-ethylphenol and the like can be mentioned.
You. R^{twenty two}Is a group represented by the general formula (i)
Examples of the product include the following.
(3-methyl-5-tert-butyl-4-hydroxy
N-hexyl phenyl) acetate, (3-methyl-5-te
tert-butyl-4-hydroxyphenyl) acetic acid isohex
Sil, (3-methyl-5-tert-butyl-4-hydrid
(Roxyphenyl) acetic acid n-heptyl, (3-methyl-5)
-Tert-butyl-4-hydroxyphenyl) acetic acid
Soheptyl, (3-methyl-5-tert-butyl-4
-Hydroxyphenyl) acetic acid n-octyl, (3-methyl
5-tert-butyl-4-hydroxyphenyl)
Isooctyl acetate, (3-methyl-5-tert-butyl)
2-hydroxyphenyl) acetic acid 2-ethylhexyl
, (3-methyl-5-tert-butyl-4-hydro
(Xyphenyl) n-nonyl acetate, (3-methyl-5-t
tert-butyl-4-hydroxyphenyl) acetic acid isono
Nyl, (3-methyl-5-tert-butyl-4-hydride
N-decyl (roxyphenyl) acetate, (3-methyl-5-
tert-butyl-4-hydroxyphenyl) acetic acid iso
Decyl, (3-methyl-5-tert-butyl-4-h)
(Droxyphenyl) n-undecyl acetate, (3-methyl
-5-tert-butyl-4-hydroxyphenyl) vinegar
Isoundecyl acid, (3-methyl-5-tert-butyl)
(4-hydroxyphenyl) n-dodecyl acetate, (3
-Methyl-5-tert-butyl-4-hydroxyphene
Nyl) isododecyl acetate, (3-methyl-5-tert)
-Butyl-4-hydroxyphenyl) propionic acid n-
Hexyl, (3-methyl-5-tert-butyl-4-
Isohexyl (hydroxyphenyl) propionate, (3
-Methyl-5-tert-butyl-4-hydroxyphene
Nyl) propionate n-heptyl, (3-methyl-5-
tert-butyl-4-hydroxyphenyl) propio
Isoheptyl acid salt, (3-methyl-5-tert-butyl)
4-hydroxyphenyl) propionic acid n-octy
, (3-methyl-5-tert-butyl-4-hydro
(Octyphenyl) isooctyl propionate, (3-methyl
5-tert-butyl-4-hydroxyphenyl)
2-ethylhexyl propionate, (3-methyl-5-
tert-butyl-4-hydroxyphenyl) propio
N-nonyl acid, (3-methyl-5-tert-butyl)
-4-hydroxyphenyl) isononyl propionate,
(3-methyl-5-tert-butyl-4-hydroxy
N-decyl phenyl) propionate, (3-methyl-5
-Tert-butyl-4-hydroxyphenyl) propyl
Isodecyl onate, (3-methyl-5-tert-butyl)
4-hydroxyphenyl) propionic acid n-unde
Sil, (3-methyl-5-tert-butyl-4-hydrid
Roxyphenyl) isoundecyl propionate, (3-
Methyl-5-tert-butyl-4-hydroxyphenyl
Ru) n-dodecyl propionate, (3-methyl-5-t)
tert-butyl-4-hydroxyphenyl) propion
Isododecyl acid, (3,5-di-tert-butyl-4)
-Hydroxyphenyl) acetic acid n-hexyl, (3,5-
Di-tert-butyl-4-hydroxyphenyl) acetic acid
Isohexyl, (3,5-di-tert-butyl-4-
(Hydroxyphenyl) acetic acid n-heptyl, (3,5-di
-Tert-butyl-4-hydroxyphenyl) acetic acid
Soheptyl, (3,5-di-tert-butyl-4-h)
N-octyl (droxyphenyl) acetate, (3,5-di-
tert-butyl-4-hydroxyphenyl) acetic acid iso
Octyl, (3,5-di-tert-butyl-4-hydrid
2-ethylhexyl (roxyphenyl) acetate, (3,5-
Di-tert-butyl-4-hydroxyphenyl) acetic acid
n-nonyl, (3,5-di-tert-butyl-4-hyl)
(Nonoxyphenyl) isononyl acetate, (3,5-di-t)
tert-butyl-4-hydroxyphenyl) acetic acid n-de
Sil, (3,5-di-tert-butyl-4-hydroxy)
(Phenyl) isodecyl acetate, (3,5-di-tert)
-Butyl-4-hydroxyphenyl) acetic acid n-undesi
, (3,5-di-tert-butyl-4-hydroxy
Phenyl) isoundecyl acetate, (3,5-di-ter
t-butyl-4-hydroxyphenyl) acetic acid n-dodeci
, (3,5-di-tert-butyl-4-hydroxy
Phenyl) isododecyl acetate, (3,5-di-tert)
-Butyl-4-hydroxyphenyl) propionic acid n-
Hexyl, (3,5-di-tert-butyl-4-hydride
Loxyphenyl) isohexyl propionate, (3,5
-Di-tert-butyl-4-hydroxyphenyl) p
N-heptyl ropionate, (3,5-di-tert-butyl)
Tyl-4-hydroxyphenyl) isoheppropionate
Tyl, (3,5-di-tert-butyl-4-hydroxy)
N-octyl (cyphenyl) propionate, (3,5-di
-Tert-butyl-4-hydroxyphenyl) propyl
Isooctyl onate, (3,5-di-tert-butyl)
2-hydroxyphenyl) propionic acid 2-ethyl
Xyl, (3,5-di-tert-butyl-4-hydro
N-nonyl propionate, (3,5-di)
-Tert-butyl-4-hydroxyphenyl) propyl
Isononyl onate, (3,5-di-tert-butyl-
4-hydroxyphenyl) n-decyl propionate,
(3,5-di-tert-butyl-4-hydroxyphene
Nyl) isodecyl propionate, (3,5-di-ter
t-butyl-4-hydroxyphenyl) propionic acid n
-Undecyl, (3,5-di-tert-butyl-4-
(Hydroxyphenyl) isoundecyl propionate,
(3,5-di-tert-butyl-4-hydroxyphene
Nyl) n-dodecyl propionate, (3,5-di-te)
rt-butyl-4-hydroxyphenyl) propionic acid
Isododecyl and the like. R^{twenty two}Is a group represented by the formula (ii)
Examples of compounds include bis (3,5-di-tert-butyl).
Tyl-4-hydroxyphenyl), bis (3,5-di-
tert-butyl-4-hydroxyphenyl) methane,
1,1-bis (3,5-di-tert-butyl-4-hi
Droxyphenyl) ethane, 1,2-bis (3,5-di
-Tert-butyl-4-hydroxyphenyl) eta
1,1-bis (3,5-di-tert-butyl-4)
-Hydroxyphenyl) propane, 1,2-bis (3,
5-di-tert-butyl-4-hydroxyphenyl)
Propane, 1,3-bis (3,5-di-tert-butyl
Ru-4-hydroxyphenyl) propane, 2,2-bis
(3,5-di-tert-butyl-4-hydroxyphene
Nyl) propane; and mixtures thereof.
You. Alkyl phenol represented by the general formula (5)
Will be described. A is an alkylene having 1 to 18 carbon atoms
Particularly preferred as the compound when the group is
A compound represented by the formula (5-1). [0046] Embedded image A is a group represented by the formula (iii)
Particularly preferred as the compound in this case is the following (5-
2) A compound represented by the formula: [0048] Embedded image Next, the alkyl phthalocyanine represented by the general formula (6)
The enol will be described. A represented by the general formula (6)
Particularly preferred as alkylphenol are specifically
Is a compound represented by the following formula (6-1) or (6-2)
It is a compound. [0050] Embedded image In the lubricating oil composition for a compressor of the present invention,
The content of the phenolic antioxidant is optional,
Is preferably 10% by mass, based on the total amount of the composition.
%, More preferably 5% by mass, and still more preferably 2% by mass.
%, Most preferably 1% by weight. Its content is 10
Even if it exceeds mass%, carbon is suppressed just enough for its content
Not only is there no further improvement effect, but on the contrary
There is a possibility that an increase in the amount of carbon generated may be caused. Meanwhile, Pheno
The lower limit of the content of polyester-based antioxidants is based on the total amount of the composition.
, Preferably 0.01% by mass, more preferably 0.0% by mass.
2% by mass, more preferably 0.05% by mass, most preferably
Or 0.1% by mass. Phenolic antioxidants
If the content is less than 0.01% by mass,
No fruit is seen. The lubricating oil composition for a compressor of the present invention comprises
In order to further enhance various performances, other known lubricants
Additives, such as rust inhibitors, metallic detergents, corrosion protection
Agents, ashless dispersants, antiwear agents, pour point depressants, defoamers, etc.
Can be used alone or in combination.
Wear. As the rust inhibitor, for example, aliphatic amines
, Metal salts of organic sulfonic acids, metal salts of organic phosphates,
Kenyl succinate, polyhydric alcohol ester, etc.
Is mentioned. As a metal-based detergent, for example, neutral,
Basic or overbased alkali metal sulfonates,
Potassium metal phenate, alkali metal salicylate, Al
Potassium earth metal sulfonate, alkaline earth metal phenet
And alkaline earth metal salicylates
it can. Sodium, potassium, etc. as alkali metals
But also alkaline earth metals such as magnesium and calcium
Cium and the like can be exemplified. Examples of the ashless dispersant include alkenyl
Succinimide, polyalkenyl polyamine, benzyl
Use only ashless dispersants for so-called lubricating oils such as amines.
Polymer such as polymethacrylate and polyacrylate
A nitrogen-containing polar monomer is introduced into the
Dispersion type viscosity index improvers and the like can also be used. Corrosion inhibitor
Examples include benzotriazoles and thiadiazo
And imidazole compounds. Examples of the antiwear agent include a sulfur compound.
Things can be used. As the sulfur-based compound, for example,
Sulfides, sulfurized olefins, sulfurized oils and fats
You. Pour point depressants include those compatible with lubricant base oils.
Examples include methacrylate-based polymers. Defoamer
For example, silicone such as dimethyl silicone
And the like. The amounts of these known additives can be arbitrarily selected.
Each additive based on the total amount of the lubricating oil composition
Content of antioxidants is usually 0.01 to 5.0
%, 0.01% each for rust inhibitor and corrosion inhibitor
To 3.0% by mass, 0.01 to 5.0% by mass for an antiwear agent
%, Pour point depressant 0.01 to 5.0% by mass, defoamer
Is blended to be 0.00001-0.05% by mass
It is desirable to do. The lubricating oil composition of the present invention may be of any type
Can be used as lubricating oil for compressors,
It is suitably used for contractors. Especially the discharge gas pressure is 0.3MP
a or more and / or the discharge gas temperature is 80 ° C. or more
The effect of the present invention is more enhanced when used in a back-acting compressor
Is done. For the same reason, the discharge gas pressure is
0.35 MPa or more is preferable, and more preferable.
At least 0.4 MPa, even more preferably
It is 0.45 MPa or more. On the other hand, the discharge gas pressure is
It is preferably 100 MPa or less, more preferably
Is 75 MPa or less, even more preferably 50 M
Pa or less. The discharge gas temperature is 90 ° C.
The temperature is preferably 100 ° C or higher.
More preferably, even more preferably 110 ° C or higher.
You. On the other hand, the discharge gas temperature must be 400 ° C or less.
Is preferably 350 ° C. or less,
More preferably, the temperature is 300 ° C. or lower. [0058] EXAMPLES Examples and comparative examples are shown below. (Examples 1 to 4) and (Comparative Examples 1 and 2) Lubricating oil compositions of the present invention (Examples 1-4) and comparative
Lubricating oil compositions (Comparative Examples 1-2) to the compositions shown in Table 1.
Respectively. The components used are as follows
It is on the street. Base oil: paraffinic refined mineral oil (kinematic viscosity (40 ° C.): 10
0mm^Two/ S) (A) Antioxidant: (1) Phenyl α having a branched alkyl group having 12 carbon atoms
-Naphthylamine (alkylated PAN) (2) Diphenyla having a branched alkyl group having 8 carbon atoms
Min (alkylated DPA) (3) Bisphenol type: bis (3,5-di-tert-butyl)
Ru-4-hydroxyphenyl) methane (B) Extreme pressure agent: zinc alkyldithiophosphate (ZnDT
P) Other additives: rust inhibitor, defoamer With respect to the obtained lubricating oil composition, the following
(1) Evaluation of the amount of generated carbide (low carbon
Evaluation of lubrication) and (2) Evaluation of lubricity. Evaluation method
The method is as follows. Table 1 shows the evaluation results.
You. (experimental method) Equipment used: 2.2kW motor output, single-stage reciprocating compressor
(Test on actual bench scale) Test conditions: compressed gas: air, discharge pressure: 0.8 ± 0.1
MPa, discharge air temperature: 230 ° C, test time: 200 hours
while (1) Evaluation of amount of generated carbide The evaluation of the amount of carbide generated was determined for the discharge valve after the experiment.
The amount of generated bon (the amount of adhesion) was visually observed and determined. car
The lower the amount of bon produced, the better the lubricating oil composition is in heat resistance.
This means that sludge hardly occurs. 5: Very good with almost no carbon adhesion. 4: Good adhesion amount of carbon. 3: The carbon is thinly attached to the entire surface. 2: Carbon is attached to the entire surface with a certain thickness. 1: Carbon adheres thickly on the entire surface, and some valve holes are clogged
State. (2) Evaluation of lubricity The lubrication was evaluated using the piston run ring run after the experiment.
The number and depth of longitudinal scratches in the
Was. The number of vertical scratches in the above part is small and the depth is shallow
The lubricating oil composition has excellent lubricity and extreme pressure
Means that 5: Very good without any vertical scratches. 4: Although there are slight vertical scratches, it is good. 3: There is a vertical wound but a shallow wound. 2: There are many vertical injuries but shallow injuries. 1: There are many vertical wounds and deep wounds. [0063] [Table 1] As is clear from the test results shown in Table 1,
The lubricating oil composition for a compressor according to the present invention is compared with those of the comparative example.
All have excellent lubricity and also reduce the amount of carbon generated
Can be Accordingly, the lubricating oil composition for a compressor of the present invention
The material has excellent lubrication and extreme pressure properties, and
Also excellent in sludge generation. [0065] The lubricating oil composition for a compressor according to the present invention has a low power.
It has both good carbon properties and good lubricity.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10N 30:06 C10N 30:06 30:10 30:10 40:30 40:30 (72) Inventor Takeshi Ken Sawada 8F Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Lubricants Division, Lubricants Division, Mitsui Nishiishi Co., Ltd. 4H104 BE07C BH07C DA02A DA06A EB02 FA02 LA03 LA05 LA20 PA20

Claims (1)

Claims: 1. An at least one base oil selected from the group consisting of mineral oils, fats and oils, and synthetic oils contains (A) an amine antioxidant and (B) a zinc dithiophosphate compound. A lubricating oil composition for a compressor comprising: