JP4524133B2 - Lubricating oil composition for compressor - Google Patents

Description

  The present invention relates to a lubricating oil composition for a compressor.

A compressor is a machine that applies work to a predetermined gas (air, nitrogen gas, oxygen gas, ammonia gas, hydrocarbon gas, combustion exhaust gas, combustion gas, CO ₂ gas, CO gas, etc.) from outside, and compresses and sends it out. It is. Compressors are broadly classified into positive displacement type and turbo type according to the operating principle of increasing gas pressure, and positive displacement compressors are further classified into reciprocating compressors and rotary compressors.

  Lubricating oil is used for the operation of these compressors. However, the lubricating oil may be carbonized by heat generated by the compression of the gas, causing malfunction. For example, in the case of a reciprocating air compressor, if lubricating oil is mixed into the compressed air during the reciprocating movement of the piston, carbides of the lubricating oil adhere to the periphery of the valve, which tends to cause malfunction of the valve.

Therefore, the lubricating oil for compressors is required to have a characteristic that carbide is difficult to be generated or adhered (hereinafter referred to as carbide suppression). An example of a lubricating oil for a compressor imparted with carbide suppression is a base oil of trimellitic acid triester and a specific amine compound added thereto (see, for example, Patent Document 1).
JP-A-1-204995

  However, other characteristics required for compressor lubricating oils may be impaired when attempting to increase carbide suppression. In particular, lubricity is very important in terms of preventing abnormal wear in the compressor, but it is difficult to achieve sufficient carbide suppression while maintaining lubricity at a high level.

  This invention is made | formed in view of such a situation, and it aims at providing the lubricating oil composition for compressors which can achieve both lubricity and carbide | carbonized_material suppression at high level.

In order to solve the above problems, the compressor oil composition of the present invention is based on (A) an ester as a base oil and, based on the total amount of the composition, (B) polybutene or a hydride thereof in an amount of 0.001 to 10% by mass; (C) an amine compound, a phenol compound, a sulfonate compound, a phenate compound, a salicylate compound, a succinimide compound, and at least one compound represented by the following general formulas (1) to (3) 0.001-10 mass% of at least 1 sort (s) of carbide inhibitors chosen from the copolymer with at least 1 sort (s) of the compound represented by following General formula (4), (5), and its hydride. And compresses and sends out at least one gas selected from air, nitrogen gas, oxygen gas, ammonia gas, hydrocarbon gas, combustion exhaust gas, combustion gas, CO ₂ gas and CO gas It is used for a compressor .

［式中、Ｒ^１、Ｒ^３、Ｒ^７及びＲ^９はそれぞれ水素原子又はメチル基を示し、Ｒ^２はアルキル基を示し、Ｒ^４は炭化水素基を示し、Ｒ^５及びＲ^６は同一でも異なっていてもよく、それぞれ水素原子、アルコキシ基又はモノアルキルアミノ基を示し、Ｒ^８はアルキレン基を示し、Ｙ^１及びＹ^２はそれぞれ窒素原子数が１個又は２個且つ酸素原子数が０〜２個のアミン残基又は複素環残基を示し、ｊは０又は１を示す。］
本発明の圧縮機油組成物においては、（Ａ）エステルを基油とし、当該基油に（Ｂ）ポリブテン又はその水素化物並びに（Ｃ）上記特定の炭化物抑制剤をそれぞれ特定量含有せしめることによって、潤滑性と炭化物抑制性との双方を十分に高めることができる。従って、本発明の圧縮機油組成物を用いることによって、異常摩耗や潤滑油の炭化が十分に防止されるため、圧縮機を長期にわたって安定的に作動させることができる。

[Wherein R ¹ , R ³ , R ⁷ and R ⁹ each represent a hydrogen atom or a methyl group, R ² represents an alkyl group, R ⁴ represents a hydrocarbon group, and R ⁵ and R ⁶ may be the same. Each may be different and each represents a hydrogen atom, an alkoxy group or a monoalkylamino group, R ⁸ represents an alkylene group, Y ¹ and Y ² each have 1 or 2 nitrogen atoms and 0 oxygen atoms Represents ~ 2 amine residues or heterocyclic residues, j represents 0 or 1; ]
In the compressor oil composition of the present invention, (A) an ester is used as a base oil, and (B) polybutene or a hydride thereof and (C) the above-mentioned specific carbide inhibitor are contained in the base oil in a specific amount. Both lubricity and carbide suppression can be sufficiently enhanced. Therefore, by using the compressor oil composition of the present invention, abnormal wear and lubricant carbonization are sufficiently prevented, so that the compressor can be stably operated over a long period of time.

  According to the lubricating oil composition for a compressor of the present invention, abnormal wear and carbonization of the lubricating oil can be sufficiently prevented, and the compressor can be stably operated over a long period of time.

  Hereinafter, preferred embodiments of the present invention will be described in detail.

  The base oil in the lubricating oil composition for a compressor of the present invention is (A) an ester.

  Any ester can be used. The alcohol constituting the ester may be a monohydric alcohol or a polyhydric alcohol, and the acid may be a monobasic acid or a polybasic acid.

  As the monohydric alcohol, those having 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms are used. Such alcohols may be linear or branched, and may be saturated or unsaturated. Specific examples of the alcohol having 1 to 24 carbon atoms include methanol, ethanol, linear or branched propanol, linear or branched butanol, linear or branched pentanol, and linear Linear or branched hexanol, linear or branched heptanol, linear or branched octanol, linear or branched nonanol, linear or branched decanol, linear or branched Undecanol, linear or branched dodecanol, linear or branched tridecanol, linear or branched tetradecanol, linear or branched pentadecanol, linear or branched hexadecane Decanol, linear or branched heptadecanol, linear or branched octadecanol, linear or branched nonadecanol, linear or branched icosa Lumpur, linear or branched Hen'ikosanoru, linear or branched Torikosanoru, such as linear or branched tetracosanol, and mixtures thereof.

  As the polyhydric alcohol, those having 2 to 10 valences, preferably 2 to 6 valences are usually used. Specific examples of the 2 to 10 valent polyhydric alcohol include, for example, ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene glycol), propylene glycol, dipropylene glycol, and polypropylene glycol (3 to 15 of propylene glycol). Monomer), 1,3-propanediol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3 -Dihydric alcohols such as propanediol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, neopentylglycol; glycerin, polyglycerin (glycerin 2- Octamers such as diglycerin, triglyceride Phosphorus, tetraglycerin, etc.), trimethylolalkanes (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.) and their 2- to 8-mer, pentaerythritol and their 2- to 4-mer, 1,2,4- Butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol, etc. Polyhydric alcohols; sugars such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose, and mixtures of two or more thereof And the like.

  Among these, ethylene glycol, diethylene glycol, polyethylene glycol (more preferably, 3 to 10 mer of ethylene glycol), propylene glycol, dipropylene glycol, polypropylene glycol (more preferably, 3 to 10 mer of propylene glycol), 1 , 3-propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylolalkane (trimethylolethane, trimethylol) Propane, trimethylolbutane, etc.) and their dimers and tetramers, pentaerythritol, dipentaerythritol 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-he Santriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol and other 2-6 polyhydric alcohols and mixtures of two or more thereof Preferably, ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, sorbitan, and a mixture of two or more thereof are more preferable.

  As the monobasic acid, a fatty acid or aromatic acid having 2 to 24 carbon atoms is usually used.

  The fatty acid may be linear or branched, and may be saturated or unsaturated. Specifically, for example, acetic acid, propionic acid, linear or branched butanoic acid, linear or branched pentanoic acid, linear or branched hexanoic acid, linear or branched heptane Acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid, linear or branched dodecane Acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched hexadecanoic acid, linear or branched heptadecane Acid, linear or branched octadecanoic acid, linear or branched hydroxyoctadecanoic acid, linear or branched nonadecanoic acid, linear or branched icosanoic acid, linear or branched Henicosanoic acid, linear or branched Saturated fatty acids such as cosanoic acid, linear or branched tricosanoic acid, linear or branched tetracosanoic acid, acrylic acid, linear or branched butenoic acid, linear or branched pentenoic acid, Linear or branched hexenoic acid, linear or branched heptenoic acid, linear or branched octenoic acid, linear or branched nonenoic acid, linear or branched decenoic acid, Linear or branched undecenoic acid, linear or branched dodecenoic acid, linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, Linear or branched hexadecenoic acid, linear or branched heptadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxyoctadecenoic acid, linear or branched nonadecene Acid, linear or branched Unsaturated fatty acids such as cocenoic acid, linear or branched heicosenoic acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, linear or branched tetracosenoic acid, and the like And the like.

  Specific examples of the aromatic monobasic acid include benzoic acid.

  Examples of the polybasic acid include aliphatic dibasic acids having 2 to 16 carbon atoms and aromatic polybasic acids.

  The chain dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be saturated or unsaturated. Specifically, for example, ethanedioic acid (oxalic acid), propanedioic acid (malonic acid), linear or branched butanedioic acid (such as succinic acid), linear or branched pentanedioic acid (glutar) Acid), linear or branched hexanedioic acid (adipic acid, etc.), linear or branched heptanedioic acid (pimelic acid, etc.), linear or branched octanedioic acid (suberic acid, etc.) ), Linear or branched nonanedioic acid (such as azelaic acid), linear or branched decanedioic acid (such as sebacic acid), linear or branched undecanedioic acid, linear or branched Dodecanedioic acid, linear or branched tridecanedioic acid, linear or branched tetradecanedioic acid, linear or branched heptadecanedioic acid, linear or branched hexadecanedioic acid, Linear or branched hexenedioic acid, linear or branched heptene diacid , Linear or branched octene diacid, linear or branched nonene diacid, linear or branched decenedioic acid, linear or branched undecenedioic acid, linear or branched Dodecenedioic acid, linear or branched tridecenedioic acid, linear or branched tetradecenedioic acid, linear or branched heptadecenedioic acid, linear or branched hexadecenedioic acid and These mixtures etc. are mentioned.

  Specific examples of the aromatic polybasic acid include benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, and pyromellitic acid.

  The combination of the alcohol and the acid constituting the ester according to the present invention is arbitrary and not particularly limited, but the combinations shown in the following (i) to (vii) are preferable.

(I) ester of monohydric alcohol and monobasic acid (ii) ester of polyhydric alcohol and monobasic acid (iii) ester of monohydric alcohol and polybasic acid (iv) polyhydric alcohol and polybasic acid (V) Esters of monohydric alcohols and polyhydric alcohols with mixed alcohols and polybasic acids (vi) Esters of polyhydric alcohols with monobasic acids and polybasic acids (vii) Monohydric alcohols and polyhydric acids Ester of mixed alcohol of monohydric alcohol and mixed acid of monobasic acid and polybasic acid.

  Of course, each of the monohydric alcohol, polyhydric alcohol, monobasic acid and polybasic acid may be one kind or two or more kinds. Further, the ester may be a complete ester in which all hydroxyl groups or carboxyl groups in the molecule are esterified, or may be a partial ester in which a part of hydroxyl groups or carboxyl groups is not esterified, A complete ester is preferred.

  Among the esters of (i) to (vii) above, (ii) an ester of a polyhydric alcohol and a monobasic acid, and (iii) a monohydric alcohol, since both lubricity and carbide suppression are further enhanced. Esters with polybasic acids are preferred, and (iii) esters of monohydric alcohols with polybasic acids are more preferred.

  (Iii) In the ester of a monohydric alcohol and a polybasic acid, any of the aforementioned monohydric alcohols can be used, but a saturated alcohol having 4 to 18 carbon atoms is preferable, and a saturated alcohol having 6 to 16 carbon atoms. Alcohol is more preferable, and saturated alcohol having 8 to 14 carbon atoms is even more preferable.

  (Iii) In the ester of a monohydric alcohol and a polybasic acid, any of the above-mentioned polybasic acids can be used, but a saturated chain dibasic acid and aromatic polybasic acid having 2 to 10 carbon atoms C4-10 saturated chain dibasic acid and aromatic polybasic acid are more preferable, C6-8 saturated chain dibasic acid and aromatic polybasic acid are still more preferable, aromatic Polybasic acids are even more preferred, and trimellitic acid is particularly preferred.

  In the present invention, one of the esters may be used alone, or two or more may be used in combination.

In the present invention, the viscosity of the ester is not particularly limited, but from the viewpoint of lubricity, the kinematic viscosity at 40 ° C. is preferably 10 mm ² / s or more, more preferably 20 mm ² / s or more, and 30 mm. ² / s or more is even more preferable, 40 mm ² / s or more is even more preferable, and 50 mm ² / s or more is most preferable. In view of the oil supply resistance and stirring resistance when applied to a compressor, preferably a kinematic viscosity at 40 ° C. is not more than 5000 mm ² / s, more preferably not more than 3000mm ² / s, 1000mm ² / Even more preferably, it is s or less.

  In the present invention, the ester is used as a base oil, and its content is not particularly limited, but is usually 60% by mass or more based on the total amount of the composition, preferably 70% by mass, more Preferably it is 80 mass% or more, More preferably, it is 90 mass% or more.

  The lubricating oil composition for a compressor of the present invention uses the above ester as a base oil, but other base oils such as mineral oil and synthetic oils other than esters may be used in combination as necessary.

  As mineral oil, for example, a solvent oil debris, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, and the like for a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and vacuum distillation, Examples thereof include paraffinic mineral oil or naphthenic mineral oil obtained by appropriately combining one or two or more purification means such as sulfuric acid washing and clay treatment.

  Synthetic oils include, for example, poly α-olefins (for example, ethylene-propylene copolymers, 1-octene oligomers, 1-decene oligomers, hydrides thereof), alkylbenzenes, alkylnaphthalenes, polyoxyalkylene glycols, poly Examples include phenyl ether, dialkyl diphenyl ether, phosphate ester (for example, tricresyl phosphate), fluorine-containing compound (for example, perfluoropolyether, fluorinated polyolefin), silicone oil and the like.

  The content of the base oil other than the ester is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 10% by mass or less, based on the total amount of the composition.

  (B) component concerning the lubricating oil composition for compressors of this invention is polybutene or its hydride.

  The polybutene here is obtained by polymerizing butene monomers such as 1-butene, 2-butene and isobutene. Among such polybutenes, an isobutene polymer is preferred because of its excellent lubricity improving effect.

  Moreover, as (B) component, the hydride obtained by hydrogenating the unsaturated bond which remains in the polybutene obtained as mentioned above may be sufficient.

  Although the average molecular weight of the component (B) is not particularly limited, the number average molecular weight is preferably 200 or more, more preferably 250 or more, and more preferably 300 or more, because the lubricity improving effect is excellent. More preferably, it is 350 or more, still more preferably 400 or more. Further, from the viewpoint of solubility in base oil, the number average molecular weight is preferably 10,000 or less, more preferably 5000 or less, still more preferably 3000 or less, and further preferably 2000 or less. It is still more preferable, and it is especially preferable that it is 1000 or less.

The viscosity of the component (B) is not particularly limited, but since the lubricity improvement effect is excellent, the kinematic viscosity at 40 ° C. is preferably 10 mm ² / s or more, more preferably 30 mm ² / s or more, It is still more preferably 50 mm ² / s or more, still more preferably 60 mm ² / s or more, and most preferably 70 mm ² / s or more. Further, from the viewpoint of solubility in base oil, the number average molecular weight is preferably 1000 mm ² / s or less, more preferably 700 mm ² / s or less, and even more preferably 500 mm ² / s or less. Preferably, it is still more preferably 300 mm ² / s or less, and most preferably 200 mm ² / s or less.

  Content of (B) component in the lubricating oil composition for compressors of this invention is 0.001-10 mass% on the basis of the composition whole quantity. When the content is less than 0.001% by mass, the lubricity tends to be insufficient. For the same reason, the content of the component (B) is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and further preferably 0.05% by mass or more. More preferred. Moreover, when content exceeds 10 mass%, oil film retainability will fall. For the same reason, the content of the component (B) is preferably 7% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less.

  The component (C) according to the lubricating oil composition for a compressor of the present invention is at least one carbide inhibitor selected from the following (C1) to (C6).

(C-1) Amine compound (C-2) Phenol compound (C-3) Sulfonate compound (C-4) Phenate compound (C-5) Salicylate compound (C-6) Succinimide compound (C-7) a copolymer of at least one compound represented by the following general formulas (1) to (3) and at least one compound represented by the following general formulas (4) and (5); Its hydride.

［式中、Ｒ^１、Ｒ^３、Ｒ^７及びＲ^９はそれぞれ水素原子又はメチル基を示し、Ｒ^２はアルキル基を示し、Ｒ^４は炭化水素基を示し、Ｒ^５及びＲ^６は同一でも異なっていてもよく、それぞれ水素原子、アルコキシ基又はモノアルキルアミノ基を示し、Ｒ^８はアルキレン基を示し、Ｙ^１及びＹ^２はそれぞれ窒素原子数が１個又は２個且つ酸素原子数が０〜２個のアミン残基又は複素環残基を示し、ｊは０又は１を示す。］
（Ｃ−１）アミン系化合物としては、（Ｃ−１−１）フェニル−α−ナフチルアミン系化合物、（Ｃ−１−２）ジアルキルジフェニルアミン系化合物、（Ｃ−１−３）ベンジルアミン系化合物、及び（Ｃ−１−４）ポリアミン系化合物が挙げられる。

[Wherein R ¹ , R ³ , R ⁷ and R ⁹ each represent a hydrogen atom or a methyl group, R ² represents an alkyl group, R ⁴ represents a hydrocarbon group, and R ⁵ and R ⁶ may be the same. Each may be different and each represents a hydrogen atom, an alkoxy group or a monoalkylamino group, R ⁸ represents an alkylene group, Y ¹ and Y ² each have 1 or 2 nitrogen atoms and 0 oxygen atoms Represents ~ 2 amine residues or heterocyclic residues, j represents 0 or 1; ]
(C-1) As amine compounds, (C-1-1) phenyl-α-naphthylamine compounds, (C-1-2) dialkyldiphenylamine compounds, (C-1-3) benzylamine compounds, And (C-1-4) polyamine compounds.

  As the (C-1-1) phenyl-α-naphthylamine compound, a compound represented by the following general formula (6) is preferably used.

［一般式（６）中、Ｒ^１０は水素原子又は炭素数１〜１６の直鎖状若しくは分枝状のアルキル基を示す。］
一般式（６）中のＲ^１０がアルキル基である場合、当該アルキル基は前述の通り炭素数１〜１６の直鎖上又は分岐状のものである。このようなアルキル基としては、具体的には例えば、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシ基、トリデシル基、テトラデシル基、ペンタデシル基、及びヘキサデシル基等（これらのアルキル基は直鎖状でも分枝状でも良い）が挙げられる。なお、Ｒ^１０の炭素数が１６を超える場合には分子中に占める官能基の割合が小さくなり、炭化物抑制効果に悪影響を与える恐れがある。

[In General Formula (6), R ¹⁰ represents a hydrogen atom or a linear or branched alkyl group having 1 to 16 carbon atoms. ]
When R ¹⁰ in the general formula (6) is an alkyl group, the alkyl group is linear or branched having 1 to 16 carbon atoms as described above. Specific examples of such an alkyl group include, for example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, A tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, and the like (these alkyl groups may be linear or branched). The ratio of functional groups occupied in the molecule in the case where the number of carbon atoms of R ¹⁰ exceeds 16 decreases, which may adversely affect the carbide suppression.

When R ¹⁰ in the general formula (6) is an alkyl group, a more excellent carbide suppressing effect can be obtained. Therefore, R ¹⁰ is preferably a branched alkyl group having 8 to 16 carbon atoms, and further has 3 or A branched alkyl group having 8 to 16 carbon atoms derived from an oligomer of 4 olefins is more preferable. Specific examples of the olefin having 3 or 4 carbon atoms include propylene, 1-butene, 2-butene and isobutylene, but propylene or isobutylene is preferable in order to obtain a more excellent carbide suppressing effect. In order to obtain a further excellent carbide suppression effect, R ¹⁰ is derived from a branched octyl group derived from a dimer of isobutylene, a branched nonyl group derived from a trimer of propylene, and a trimer of isobutylene. Even more preferred are a branched dodecyl group derived, a branched dodecyl group derived from a propylene tetramer or a branched pentadecyl group derived from a propylene pentamer, a moiety derived from a dimer of isobutylene. A branched octyl group, a branched dodecyl group derived from a trimer of isobutylene, or a branched dodecyl group derived from a tetramer of propylene is particularly preferred.

  As phenyl-α-naphthylamine represented by the general formula (6), a commercially available product may be used, or a synthetic product may be used. The synthesized product is a reaction between phenyl-α-naphthylamine and a halogenated alkyl compound having 1 to 16 carbon atoms, or phenyl-α-naphthylamine and an olefin or carbon number having 2 to 16 carbon atoms, using a Friedel-Crafts catalyst. It can be easily synthesized by reacting with 2 to 16 olefin oligomers. Specific examples of Friedel-Crafts catalysts include metal halides such as aluminum chloride, zinc chloride, and iron chloride; acidic catalysts such as sulfuric acid, phosphoric acid, phosphorus pentoxide, boron fluoride, acidic clay, and activated clay. Etc. can be used.

  As the (C-1-2) dialkyldiphenylamine compound, p, p'-dialkyldiphenylamine represented by the following general formula (7) is preferably used.

［一般式（７）中、Ｒ^１１及びＲ^１２は同一でも異なっていてもよく、それぞれ炭素数１〜１６のアルキル基を示す。］
Ｒ^１１及びＲ^１２で表されるアルキル基としては、具体的には、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシ基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基等（これらのアルキル基は直鎖状でも分枝状でも良い）が挙げられる。これらの中でも、より優れた炭化物抑制効果が得られることから、Ｒ^１１及びＲ^１２としては、炭素数３〜１６の分枝アルキル基が好ましく、炭素数３又は４のオレフィン又はそのオリゴマーから誘導される炭素数３〜１６の分枝アルキル基がより好ましい。炭素数３又は４のオレフィンとしては、具体的にはプロピレン、１−ブテン、２−ブテン及びイソブチレン等が挙げられるが、より優れた炭化物抑制効果が得られることから、プロピレン又はイソブチレンが好ましい。また、Ｒ^１１又はＲ^１２としては、一層優れた炭化物抑制効果が得られることから、それぞれプロピレンから誘導されるイソプロピル基、イソブチレンから誘導されるｔｅｒｔ−ブチル基、プロピレンの２量体から誘導される分枝ヘキシル基、イソブチレンの２量体から誘導される分枝オクチル基、プロピレンの３量体から誘導される分枝ノニル基、イソブチレンの３量体から誘導される分枝ドデシル基、プロピレンの４量体から誘導される分枝ドデシル基又はプロピレンの５量体から誘導される分枝ペンタデシル基がさらにより好ましく、イソブチレンから誘導されるｔｅｒｔ−ブチル基、プロピレンの２量体から誘導される分枝ヘキシル基、イソブチレンの２量体から誘導される分枝オクチル基、プロピレンの３量体から誘導される分枝ノニル基、イソブチレンの３量体から誘導される分枝ドデシル基又はプロピレンの４量体から誘導される分枝ドデシル基が最も好ましい。

[In General Formula (7), R ¹¹ and R ¹² may be the same or different and each represents an alkyl group having 1 to 16 carbon atoms. ]
Specific examples of the alkyl group represented by R ¹¹ and R ¹² include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, and undecyl. Group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group and the like (these alkyl groups may be linear or branched). Among these, a branched alkyl group having 3 to 16 carbon atoms is preferable as R ¹¹ and R ¹² because a more excellent carbide suppressing effect is obtained, and is derived from an olefin having 3 or 4 carbon atoms or an oligomer thereof. A branched alkyl group having 3 to 16 carbon atoms is more preferable. Specific examples of the olefin having 3 or 4 carbon atoms include propylene, 1-butene, 2-butene and isobutylene. Propylene or isobutylene is preferable because a more excellent carbide suppressing effect can be obtained. In addition, R ¹¹ or R ¹² is derived from an isopropyl group derived from propylene, a tert-butyl group derived from isobutylene, or a dimer of propylene, since a further excellent carbide suppressing effect is obtained. Branched hexyl group, branched octyl group derived from dimer of isobutylene, branched nonyl group derived from propylene trimer, branched dodecyl group derived from isobutylene trimer, propylene 4 Even more preferred are branched dodecyl groups derived from dimers or branched pentadecyl groups derived from pentamers of propylene, tert-butyl groups derived from isobutylene, branches derived from dimers of propylene A hexyl group, a branched octyl group derived from an isobutylene dimer, and a fraction derived from a propylene trimer Nonyl group, a branched dodecyl group derived from a tetramer of branched dodecyl or propylene derived from a trimer of isobutylene most preferred.

When a compound in which one or both of R ¹¹ and R ¹² are hydrogen atoms is used, sludge may be generated due to oxidation of the compound itself. Moreover, when carbon number of an alkyl group exceeds 16, the ratio of the alkyl group which occupies in a molecule | numerator becomes small, and there exists a possibility that the carbide | carbonized_material suppression effect may fall.

  As the p, p'-dialkyldiphenylamine represented by the general formula (7), a commercially available product may be used, or a synthesized product may be used. The synthesized product uses a Friedel-Crafts catalyst, reaction of diphenylamine, a C1-C16 halogenated alkyl compound and diphenylamine, or diphenylamine and a C2-C16 olefin, a C2-C16 olefin, or these It can be easily synthesized by reacting with the above oligomer. As the Friedel-Crafts catalyst, metal halides and acidic catalysts exemplified in the description of phenyl-α-naphthylamine are used.

  The compounds represented by the general formulas (6) and (7) are both aromatic amines. These aromatic amines may be used alone or as a mixture of two or more different structures, but in order to obtain a more excellent carbide suppression effect, the general formula (6) It is preferable to use phenyl-α-naphthylamine represented by p and p′-dialkyldiphenylamine represented by the general formula (7) in combination. The mixing ratio in this case is arbitrary, but is preferably in the range of 1/10 to 10/1 by mass ratio.

  As the (C-1-3) benzylamine compound, a compound represented by the following general formula (8) is preferably used.

［一般式（８）中、Ｒ^１３は、炭素数４０〜４００のアルキル基又はアルケニル基（好ましくは炭素数６０〜３５０のアルキル基又はアルケニル基）を示し、ｇは１〜５の整数（好ましくは２〜４の整数）を示す。］
一般式（８）で表されるベンジルアミンの製造方法は何ら限定されるものではないが、例えば、プロピレンオリゴマー、ポリブテン、エチレン−プロピレン共重合体等のポリオレフィンをフェノールと反応させてアルキルフェノールとした後、これにホルムアルデヒドとジエチレントリアミン、トリエチレンテトラミン、テトラエチレンペンタミン、ペンタエチレンヘキサミン等のポリアミンをマンニッヒ反応により反応させることにより得ることができる。

[In General Formula (8), R ¹³ represents an alkyl group or alkenyl group having 40 to 400 carbon atoms (preferably an alkyl group or alkenyl group having 60 to 350 carbon atoms), and g is an integer of 1 to 5 (preferably Represents an integer of 2 to 4. ]
Although the manufacturing method of the benzylamine represented by General formula (8) is not limited at all, For example, after making polyolefin, such as a propylene oligomer, polybutene, and an ethylene-propylene copolymer, react with phenol, and it is set as alkylphenol. It can be obtained by reacting this with a polyamine such as formaldehyde and diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine or the like by a Mannich reaction.

  In addition to the compound represented by the general formula (8), the (C-1-3) benzylamine compound according to the present invention includes derivatives of the compound. Specific examples of the derivative of the component (C-1-3) include, for example, a compound represented by the general formula (8), a monocarboxylic acid having 2 to 30 carbon atoms (fatty acid, etc.), oxalic acid, and phthalic acid. , Acid-modified compounds obtained by neutralizing or amidating some or all of the remaining amino groups and / or imino groups by the action of polycarboxylic acids having 2 to 30 carbon atoms such as trimellitic acid and pyromellitic acid; Boron-modified compound in which boric acid is allowed to act on the compound represented by the formula (8) to neutralize part or all of the remaining amino group and / or imino group; the compound represented by the general formula (8) Examples of the sulfur-modified compound in which a sulfur compound is allowed to act and a modified compound in which two or more kinds of modifications selected from acid modification, boron modification, and sulfur modification are combined for the compound represented by the general formula (8).

  Although the nitrogen content in (C-1-3) component is arbitrary, since the outstanding carbide | carbonized_material suppression effect is acquired, the said nitrogen content becomes like this. Preferably it is 0.01-10 mass%, More preferably, it is 0. .1 to 10% by mass.

  As the (C-1-4) polyamine compound, a compound represented by the following general formula (9) is preferably used.

R ¹⁴ —NH— (CH ₂ CH ₂ NH) _r —H (9)
[In General Formula (9), R ¹⁴ represents an alkyl group or alkenyl group having 40 to 400 carbon atoms (preferably an alkyl group or alkenyl group having 60 to 350 carbon atoms), and r is an integer of 1 to 5 (preferably 2 to 2). An integer of 4). ]
The production method of the polyamine represented by the general formula (9) is not limited in any way. For example, after chlorinating a polyolefin such as a propylene oligomer, polybutene, or ethylene-propylene copolymer, ammonia or ethylenediamine is added thereto. It can be obtained by reacting polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine and pentaethylenehexamine.

  In addition to the compound represented by the general formula (9), the (C-1-4) polyamine compound according to the present invention includes derivatives of the compound. Specific examples of the derivative of the component (C-1-4) include, for example, a compound represented by the general formula (9), a monocarboxylic acid having 2 to 30 carbon atoms (fatty acid, etc.), oxalic acid, and phthalic acid. , Acid-modified compounds obtained by neutralizing or amidating some or all of the remaining amino groups and / or imino groups by the action of polycarboxylic acids having 2 to 30 carbon atoms such as trimellitic acid and pyromellitic acid; Boron-modified compound in which boric acid is allowed to act on the compound represented by the formula (9) to neutralize part or all of the remaining amino group and / or imino group; the compound represented by the general formula (9) Examples of the sulfur-modified compound in which a sulfur compound is allowed to act and a modified compound in which two or more kinds of modifications selected from acid modification, boron modification, and sulfur modification are combined for the compound represented by the general formula (9).

  Although the nitrogen content in the component (C-1-4) is arbitrary, the nitrogen content is preferably 0.01 to 10% by mass, more preferably 0 because an excellent carbide suppression effect is obtained. .1 to 10% by mass.

  (C-2) As the phenolic compound, any alkylphenolic compound used as an antioxidant for lubricating oil can be used, and is not particularly limited. For example, the following general formula (10) Preferred examples include at least one alkylphenol compound selected from the compounds represented by formula (11) and formula (12).

［一般式（１０）中、Ｒ^１５は炭素数１〜４のアルキル基を示し、Ｒ^１６は水素原子又は炭素数１〜４のアルキル基を示し、Ｒ^１７は水素原子、炭素数１〜４のアルキル基、下記一般式（ｉ）又は（ｉｉ）：

[In General Formula (10), R ¹⁵ represents an alkyl group having 1 to 4 carbon atoms, R ¹⁶ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ¹⁷ represents a hydrogen atom or 1 to 4 carbon atoms. An alkyl group of the following general formula (i) or (ii):

（一般式（ｉ）中、Ｒ^１８は炭素数１〜６のアルキレン基を示し、Ｒ^１９は炭素数１〜２４のアルキル基又はアルケニル基を示す。）

(In general formula (i), R ¹⁸ represents an alkylene group having 1 to 6 carbon atoms, and R ¹⁹ represents an alkyl group or alkenyl group having 1 to 24 carbon atoms.)

（一般式（ｉｉ）中、Ｒ^２０は炭素数１〜６のアルキレン基を示し、Ｒ^２１は炭素数１〜４のアルキル基を示し、Ｒ^２２は水素原子又は炭素数１〜４のアルキル基を示し、ｋは０又は１を示す。）
で表される基を示す。］

(In General Formula (ii), R ²⁰ represents an alkylene group having 1 to 6 carbon atoms, R ²¹ represents an alkyl group having 1 to 4 carbon atoms, and R ²² represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. And k represents 0 or 1.)
The group represented by these is shown. ]

［一般式（１１）中、Ｒ^２３及びＲ^２５は同一でも異なっていてもよく、それぞれ炭素数１〜４のアルキル基を示し、Ｒ^２４及びＲ^２６は同一でも異なっていてもよく、それぞれ水素原子又は炭素数１〜４のアルキル基を示し、Ｒ^２７及びＲ^２８は同一でも異なっていてもよく、それぞれ炭素数１〜６のアルキレン基を示し、Ａは炭素数１〜１８のアルキレン基又は下記の一般式（ｉｉｉ）：
−Ｒ^２７−Ｓ−Ｒ^２８− （ｉｉｉ）
（一般式（ｉｉｉ）中、Ｒ^２７及びＲ^２８は同一でも異なっていてもよく、それぞれ炭素数１〜６のアルキレン基を示す）
で表される基を示す。］

[In General Formula (11), R ²³ and R ²⁵ may be the same or different and each represents an alkyl group having 1 to 4 carbon atoms; R ²⁴ and R ²⁶ may be the same or different; Represents an atom or an alkyl group having 1 to 4 carbon atoms, R ²⁷ and R ²⁸ may be the same or different, each represents an alkylene group having 1 to 6 carbon atoms, and A represents an alkylene group having 1 to 18 carbon atoms or The following general formula (iii):
—R ²⁷ —S—R ²⁸ — (iii)
(In the general formula (iii), R ²⁷ and R ²⁸ may be the same or different and each represents an alkylene group having 1 to 6 carbon atoms)
The group represented by these is shown. ]

一般式（１２）中、Ｒ^２９は炭素数１〜４のアルキル基を示し、Ｒ^３０は水素原子又は炭素数１〜４のアルキル基を示し、Ｒ^３１は炭素数１〜６のアルキレン基又は下記一般式（ｉｖ）：

In General Formula (12), R ²⁹ represents an alkyl group having 1 to 4 carbon atoms, R ³⁰ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ³¹ represents an alkylene group having 1 to 6 carbon atoms or The following general formula (iv):

（一般式（ｉｖ）中、Ｒ^３２及びＲ^３３は同一でも異なっていてもよく、それぞれ炭素数１〜６のアルキレン基を示す。）
で表される基を示す。］
上記一般式（１０）で表される化合物において、Ｒ^１７が一般式（ｉ）で表される基である化合物の場合、一般式（ｉ）中のＲ^１８が炭素数１〜２のアルキレン基であり、Ｒ^１９が炭素数６〜１２の直鎖状又は分枝状アルキル基であるものがより好ましく、一般式（ｉ）のＲ^１８が炭素数１〜２のアルキレン基であり、Ｒ^１９が炭素数６〜１２の分枝状アルキル基であるものが特に好ましい。

(In the general formula (iv), R ³² and R ³³ may be the same or different and each represents an alkylene group having 1 to 6 carbon atoms.)
The group represented by these is shown. ]
In the compound represented by the above general formula (10), when R ¹⁷ is a group represented by the general formula (i), R ¹⁸ in the general formula (i) is an alkylene group having 1 to 2 carbon atoms. R ¹⁹ is more preferably a linear or branched alkyl group having 6 to 12 carbon atoms, R ^{18 in the} general formula (i) is an alkylene group having 1 to 2 carbon atoms, and R ¹⁹ Is particularly preferably a branched alkyl group having 6 to 12 carbon atoms.

  Preferred compounds among the compounds represented by formula (10) are shown below.

Examples of the compound when R ¹⁷ is an alkyl group having 1 to 4 carbon atoms include 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-4-ethylphenol, and the like. Can be mentioned.

Examples of the compound when R ¹⁷ is a group represented by the general formula (i) include the following. N-hexyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetate, isohexyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetate, (3-methyl-5-tert-butyl) -4-hydroxyphenyl) acetic acid n-heptyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isoheptyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetate n-octyl Isooctyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetate, 2-ethylhexyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetate, (3-methyl-5-tert- Butyl-4-hydroxyphenyl) acetic acid n-nonyl, (3-methyl-5-tert-butyl-4 Hydroxyphenyl) isononyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetate n-decyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isodecyl acetate, (3-methyl -5-tert-butyl-4-hydroxyphenyl) acetic acid n-undecyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetoisodecyl, (3-methyl-5-tert-butyl-4-hydroxy) Phenyl) acetate n-dodecyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isododecyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate n-hexyl, (3 -Methyl-5-tert-butyl-4-hydroxyphenyl) propionic acid Hexyl, n-heptyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate, isoheptyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate, (3-methyl-5 -Tert-butyl-4-hydroxyphenyl) n-octylpropionate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isooctylpropionate, (3-methyl-5-tert-butyl-4-hydroxy) 2-ethylhexyl (phenyl) propionate, n-nonyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate, isononyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate, (3-methyl-5-tert-butyl-4-hydroxyl N-decyl propionate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isodecyl propionate, n-undecyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate, Isoundecyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate, n-dodecyl (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionate, (3-methyl-5-tert -Butyl-4-hydroxyphenyl) isododecyl propionate, (3,5-di-tert-butyl-4-hydroxyphenyl) acetate n-hexyl, (3,5-di-tert-butyl-4-hydroxyphenyl) acetic acid Isohexyl, (3,5-di-tert-butyl-4-hydroxyphenyl N-heptyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) isoheptyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) acetate n-octyl, (3,5- Di-tert-butyl-4-hydroxyphenyl) isooctyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) acetic acid 2-ethylhexyl, (3,5-di-tert-butyl-4-hydroxyphenyl) ) N-nonyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) isononyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) acetate n-decyl, (3,5 -Di-tert-butyl-4-hydroxyphenyl) isodecyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) N-undecyl acid, (3,5-di-tert-butyl-4-hydroxyphenyl) isoundecyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) acetate n-dodecyl, (3,5- Di-tert-butyl-4-hydroxyphenyl) isododecyl acetate, n-hexyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, (3,5-di-tert-butyl-4-hydroxy) (Phenyl) isohexylpropionate, (3,5-di-tert-butyl-4-hydroxyphenyl) n-heptylpropionate, (3,5-di-tert-butyl-4-hydroxyphenyl) isoheptylpropionate, (3 , 5-Di-tert-butyl-4-hydroxyphenyl) propionate n-octyl, (3,5-di- tert-butyl-4-hydroxyphenyl) isooctylpropionate, 2-ethylhexyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, (3,5-di-tert-butyl-4-hydroxyphenyl) ) N-nonyl propionate, (3,5-di-tert-butyl-4-hydroxyphenyl) isononyl propionate, (3,5-di-tert-butyl-4-hydroxyphenyl) n-decyl propionate, ( Isodecyl 3,5-di-tert-butyl-4-hydroxyphenyl) propionate, n-undecyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, (3,5-di-tert- Butyl-4-hydroxyphenyl) isoundecyl propionate, (3,5-di-tert Butyl-4-hydroxyphenyl) propionic acid n- dodecyl, and (3,5-di -tert- butyl-4-hydroxyphenyl) isododecyl propionate.

Examples of the compound when R ¹⁷ is a group represented by the general formula (ii) include bis (3,5-di-tert-butyl-4-hydroxyphenyl), bis (3,5-di-tert). -Butyl-4-hydroxyphenyl) methane, 1,1-bis (3,5-di-tert-butyl-4-hydroxyphenyl) ethane, 1,2-bis (3,5-di-tert-butyl-4) -Hydroxyphenyl) ethane, 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-4-hydroxyphenyl) propane, 2,2-bis (3,5-di-tert-butyl-4-hydroxyphenyl) propane and the like; and A mixture of two or more of these may be used.

  Next, the alkylphenol represented by the general formula (11) will be described.

  A particularly preferable compound when A in the general formula (11) is an alkylene group having 1 to 18 carbon atoms is a compound represented by the following formula (11-1).

また、一般式（１１）中のＡが式（ｉｉｉ）で表される基である場合の特に好ましい化合物は、下記式（１１−２）で表される化合物である。

A particularly preferred compound when A in the general formula (11) is a group represented by the formula (iii) is a compound represented by the following formula (11-2).

次に、一般式（１２）で表されるアルキルフェノールについて説明する。

Next, the alkylphenol represented by the general formula (12) will be described.

  Specifically preferred as the alkylphenol represented by the general formula (12) is a compound represented by the following formula (19-1) or (19-2).

（Ｃ−３）スルホネート系化合物としては、スルホン酸のアルカリ金属塩、アルカリ土類金属塩、アミン塩等が挙げられるが、中でもアルカリ土類金属塩であるアルカリ土類金属スルホネートが好ましく使用される。より具体的には例えば、分子量１００〜１５００、好ましくは２００〜７００のアルキル芳香族化合物をスルホン化することによって得られるアルキル芳香族スルホン酸のアルカリ土類金属塩、特にマグネシウム塩及び／又はカルシウム塩が挙げられる。アルキル芳香族スルホン酸としては、具体的には、いわゆる石油スルホン酸や合成スルホン酸等が挙げられる。

Examples of (C-3) sulfonate compounds include alkali metal salts, alkaline earth metal salts, and amine salts of sulfonic acids. Among them, alkaline earth metal sulfonates that are alkaline earth metal salts are preferably used. . More specifically, for example, alkaline earth metal salts of alkyl aromatic sulfonic acids obtained by sulfonating alkyl aromatic compounds having a molecular weight of 100 to 1500, preferably 200 to 700, particularly magnesium salts and / or calcium salts. Is mentioned. Specific examples of the alkyl aromatic sulfonic acid include so-called petroleum sulfonic acid and synthetic sulfonic acid.

  As said petroleum sulfonic acid, what sulfonated the alkyl aromatic compound of the lubricating oil fraction of mineral oil, what is called mahoganic acid etc. byproduced at the time of white oil manufacture are generally used. As the synthetic sulfonic acid, for example, an alkylbenzene having a linear or branched alkyl group obtained as a by-product from an alkylbenzene production plant that is a raw material for detergents or by alkylating polyolefin with benzene is used as a raw material. , Sulfonated ones thereof, or sulfonated alkylnaphthalenes such as dinonylnaphthalene are used. As the sulfonating agent for sulfonating these alkyl aromatic compounds, fuming sulfuric acid and sulfuric anhydride are usually used.

  In addition, (C-3) sulfonate compounds according to the present invention include alkyl aromatic sulfonic acids and the like, and alkaline earth metal bases such as magnesium and / or calcium alkaline earth metal oxides and hydroxides. Neutral salt (normal salt) obtained by reacting with alkali metal salt such as sodium salt or potassium salt and then substituting with alkaline earth metal salt, etc., and these neutral salts (normal salt) Excessive alkaline earth metal salt or alkaline earth metal base (alkali earth metal hydroxide or oxide) heated in the presence of water, or in the presence of carbon dioxide An overbased salt (superbasic salt) obtained by reacting a basic salt (normal salt) with an alkaline earth metal base is also included.

  These reactions are usually performed in a solvent (an aliphatic hydrocarbon solvent such as hexane, an aromatic hydrocarbon solvent such as xylene, a light lubricant base oil, or the like). Metal-based detergents are usually commercially available in a state diluted with a light lubricating base oil or the like, and are available, but generally the metal content is 1.0 to 20% by mass, preferably Is 2.0 to 16% by mass.

  Examples of (C-4) phenate compounds include alkali metal salts, alkaline earth metal salts, and amine salts of phenolic compounds. Among them, alkaline earth metal phenates that are alkaline earth metal salts are preferably used. The More specifically, for example, alkylphenol having at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms, and alkylphenol sulfide obtained by reacting this alkylphenol with elemental sulfur. Or the alkaline earth metal salt of the Mannich reaction product of the alkylphenol obtained by making this alkylphenol and formaldehyde react, especially a magnesium salt and / or a calcium salt are mentioned.

  In addition, (C-4) phenate compounds according to the present invention include alkylphenols, alkylphenol sulfides, Mannich reactants of alkylphenols, etc., such as oxides and hydroxides of alkaline earth metals of magnesium and / or calcium directly. Not only neutral salts (normal salts) obtained by reacting with alkaline earth metal bases, or once replacing alkali metal salts such as sodium salts and potassium salts with alkaline earth metal salts, but also these Basic salt obtained by heating neutral salt (normal salt) and excess alkaline earth metal salt or alkaline earth metal base (hydroxide or oxide of alkaline earth metal) in the presence of water Overbasic salt (superbasic) obtained by reacting neutral salt (normal salt) with alkaline earth metal base in the presence of carbon dioxide ) It is also included.

  Examples of (C-5) salicylate compounds include alkali metal salts, alkaline earth metal salts and amine salts of salicylic acid. Among them, alkaline earth metal salicylates which are alkaline earth metal salts are preferably used. More specifically, for example, an alkaline earth metal salt of alkyl salicylic acid having at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms, particularly magnesium salt and / or calcium. Salt.

  In the (C-5) salicylate compound according to the present invention, alkyl salicylic acid or the like is directly reacted with an alkaline earth metal base such as magnesium or / or calcium alkaline earth metal oxide or hydroxide. Or once obtained as an alkali metal salt such as sodium salt or potassium salt and then replaced with an alkaline earth metal salt, etc., as well as these neutral salts (normal salts) Excessive alkaline earth metal salt or alkaline earth metal base (alkali earth metal hydroxide or oxide) heated in the presence of water, or in the presence of carbon dioxide An overbased salt (superbasic salt) obtained by reacting a basic salt (normal salt) with an alkaline earth metal base is also included.

  More specifically, examples of the (C-6) succinimide-based compound include compounds represented by the following general formula (13) or general formula (14).

［一般式（１３）中、Ｒ^３４は、炭素数４０〜４００（好ましくは６０〜３５０）のアルキル基又はアルケニル基を示し、ｎは１〜５（好ましくは２〜４）の整数を示す。］

[In General Formula (13), R ³⁴ represents an alkyl group or alkenyl group having 40 to 400 (preferably 60 to 350) carbon atoms, and n represents an integer of 1 to 5 (preferably 2 to 4). ]

［一般式（１４）中、Ｒ^３５及びＲ^３６は同一でも異なっていてもよく、それぞれ炭素数４０〜４００（好ましくは６０〜３５０）のアルキル基又はアルケニル基を示し、ｍは０〜４（好ましくは１〜３）の整数を示す。］
これらのコハク酸イミドの製造方法は何ら限定されるものではないが、例えばプロピレンオリゴマー、ポリブテン、エチレン−プロピレン共重合体等のポリオレフィンを無水マレイン酸と反応させて無水アルケニルコハク酸を得た後、ジエチレントリアミン、トリエチレンテトラミン、テトラエチレンペンタミン、ペンタエチレンヘキサン等のポリアミンを用いてイミド化したもの等が挙げられる。

[In General Formula (14), R ³⁵ and R ³⁶ may be the same or different and each represents an alkyl or alkenyl group having 40 to 400 (preferably 60 to 350) carbon atoms, and m is 0 to 4 ( Preferably the integer of 1-3) is shown. ]
Although the production method of these succinimides is not limited at all, for example, after reacting polyolefin such as propylene oligomer, polybutene, ethylene-propylene copolymer with maleic anhydride to obtain alkenyl succinic anhydride, Examples thereof include those imidized with polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexane.

  The (C-6) succinimide according to the present invention includes a so-called monotype succinimide represented by the general formula (13) in which succinic anhydride is added to one end of the polyamine at the time of imidization, and both ends of the polyamine. A so-called bis-type succinimide as represented by the general formula (14) to which succinic anhydride is added is included. As the component (C-6), only one of them may be used. You may use it in combination.

  Next, the component (C-7) will be described.

  The component (C-7) includes at least one of the compounds represented by the general formulas (1) to (3) (hereinafter sometimes referred to as a monomer component (C-7-1)), the general formula (4), It is a copolymer of at least one of the compounds represented by (5) (hereinafter sometimes referred to as monomer component (C-7-2)), or a hydride thereof.

［一般式（１）中、Ｒ^１は水素原子又はメチル基を示し、Ｒ^２はアルキル基（好ましくは炭素数１〜１８のアルキル基）を示す。］

[In General Formula (1), R ¹ represents a hydrogen atom or a methyl group, and R ² represents an alkyl group (preferably an alkyl group having 1 to 18 carbon atoms). ]

［一般式（２）中、Ｒ^３は水素原子又はメチル基を示し、Ｒ^４は炭化水素基（好ましくは炭素数１〜１２の炭化水素基）を示す。］

[In General Formula (2), R ³ represents a hydrogen atom or a methyl group, and R ⁴ represents a hydrocarbon group (preferably a hydrocarbon group having 1 to 12 carbon atoms). ]

［一般式（３）中、Ｒ^５及びＲ^６は同一でも異なっていてもよく、それぞれ水素原子、アルコキシ基（−ＯＲ^３７：Ｒ^３７はアルキル基（好ましくは炭素数１〜１８のアルキル基）を示す）、又はモノアルキルアミノ基（−ＮＨＲ^３８：Ｒ^３８はアルキル基（好ましくは炭素数１〜１８のアルキル基）を示す）を示す。］

[In General Formula (3), R ⁵ and R ⁶ may be the same or different, and each is a hydrogen atom or an alkoxy group (—OR ³⁷ : R ³⁷ is an alkyl group (preferably an alkyl group having 1 to 18 carbon atoms)). Or a monoalkylamino group (—NHR ³⁸ : R ³⁸ represents an alkyl group (preferably an alkyl group having 1 to 18 carbon atoms)). ]

［一般式（４）中、Ｒ^７は水素原子又はメチル基を示し、Ｒ^８はアルキレン基（好ましくは炭素数２〜１８のアルキレン基）を示し、ｐは０又は１を示し、Ｙ^１は窒素原子数が１個又は２個且つ酸素原子数が０〜２個のアミン残基又は複素環残基を示す。］

[In General Formula (4), R ⁷ represents a hydrogen atom or a methyl group, R ⁸ represents an alkylene group (preferably an alkylene group having 2 to 18 carbon atoms), p represents 0 or 1, and Y ¹ represents An amine residue or a heterocyclic residue having 1 or 2 nitrogen atoms and 0 to 2 oxygen atoms is shown. ]

［一般式（５）中、Ｒ^９は水素原子又はメチル基を示し、Ｙ^２は窒素原子数が１個又は２個且つ酸素原子数が０〜２個のアミン残基又は複素環残基を示す。］
先ず、モノマー成分（Ｃ−７−１）について説明する。

[In General Formula (5), R ⁹ represents a hydrogen atom or a methyl group, and Y ² represents an amine residue or a heterocyclic residue having 1 or 2 nitrogen atoms and 0 to 2 oxygen atoms. Show. ]
First, the monomer component (C-7-1) will be described.

In general formula (1), the alkyl group represented by R ² is preferably an alkyl group having 1 to 18 carbon atoms, specifically, for example, 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, linear or branched hexyl group, 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 undecyl group, linear or branched dodecyl group, linear or branched Branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group, linear or branched heptadecyl group, linear or branched octadecyl group, etc. Is mentioned. The same applies to the alkyl group represented by R ³⁷ of the alkoxy group (—OR ³⁷ ) according to the general formula (3) or the alkyl group represented by R ³⁸ of the monoalkylamino group (—NHR ³⁸ ).

As a hydrocarbon group represented by R < ⁴ > of General formula (2), a C1-C12 hydrocarbon group is preferable, Specifically, a C1-C12 alkyl group, C5-C7, for example. A cycloalkyl group having 6 to 11 carbon atoms, an alkenyl group having 2 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkylaryl group having 7 to 12 carbon atoms, and 7 to 12 carbon atoms. Of the arylalkyl group.

  Examples of the alkyl group having 1 to 12 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, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, straight Examples thereof include a chain or branched undecyl group, a straight chain or branched dodecyl group, and the like.

  Examples of the cycloalkyl group having 5 to 12 carbon atoms include a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group.

  Examples of the alkylcycloalkyl group having 6 to 11 carbon atoms include a methylcyclopentyl group, a dimethylcyclopentyl group (including all structural isomers), a methylethylcyclopentyl group (including all structural isomers), a diethylcyclopentyl group ( Including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (including all structural isomers) Including), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers), methylethylcycloheptyl group (including all structural isomers), diethylcycloheptyl group (including all structural isomers) Etc.

  Examples of the alkenyl group having 2 to 12 carbon atoms include linear or branched butenyl group, linear or branched pentenyl group, linear or branched hexenyl group, linear or branched heptenyl group, direct Examples thereof include a chain or branched octenyl group, a linear or branched nonenyl group, a linear or branched decenyl group, a linear or branched undecenyl group, a linear or branched dodecenyl group, and the like.

  Examples of the aryl group having 6 to 12 carbon atoms include a phenyl group and a naphthyl group.

  Examples of the alkylaryl group having 7 to 12 carbon atoms include a tolyl group (including all structural isomers), a xylyl group (including all structural isomers), and an ethylphenyl group (including all structural isomers). , Linear or branched propylphenyl group (including all structural isomers), linear or branched butylphenyl group (including all structural isomers), linear or branched pentylphenyl group (all And a straight-chain or branched hexylphenyl group (including all structural isomers) and the like.

  Examples of the arylalkyl group having 7 to 12 carbon atoms include benzyl group, phenylethyl group, phenylpropyl group (including propyl group isomers), phenylbutyl group (including butyl group isomers), and phenylpentyl. Groups (including isomers of pentyl groups), phenylhexyl groups (including isomers of hexyl groups), and the like.

  Preferable examples of the monomer component (C-7-1) include, for example, an alkyl acrylate having 1 to 18 carbon atoms, an alkyl methacrylate having 1 to 18 carbon atoms, an olefin having 2 to 20 carbon atoms, styrene, and methylstyrene. , Maleic anhydride ester, maleic anhydride amide, and a mixture of two or more thereof.

  Next, the monomer component (C-7-2) will be described.

In the general formula (4), the alkylene group represented by R ⁸ is preferably an alkylene group having 2 to 18 carbon atoms, specifically, for example, a linear or branched ethylene group, a linear or branched propylene. Group, linear or branched butylene group, linear or branched pentylene group, linear or branched hexylene group, linear or branched heptylene group, linear or branched octylene group, linear or Branched nonylene group, linear or branched decylene group, linear or branched undecylene group, linear or branched dodecylene group, linear or branched tridecylene group, linear or branched tetradecylene group A linear or branched pentadecylene group, a linear or branched hexadecylene group, a linear or branched heptadecylene group, a linear or branched octadecylene group, and the like.

Examples of the amine residue or heterocyclic residue represented by Y ¹ in the general formula (4) and Y ² in the general formula (5) include a dimethylamino group, a diethylamino group, a dipropamino group, and dibutyl. Amino group, anilino group, toluidino group, xylidino group, acetylamino group, benzoylamino group, morpholino group, pyrrolyl group, pyrrolino group, pyridyl group, methylpyridyl group, pyrrolidinyl group, piperidinyl group, quinolyl group, pyrrolidonyl group, pyrrolidono group , An imidazolino group, and a pyrazino group.

  Specific examples of preferable monomer component (C-7-2) include dimethylaminomethyl methacrylate, diethylaminomethyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-methyl-5-vinylpyridine, and morpholinomethyl. Examples include methacrylate, morpholinoethyl methacrylate, N-vinylpyrrolidone, and a mixture of two or more thereof.

  When copolymerizing the monomer component (C-7-1) and the monomer component (C-7-2), the copolymerization ratio (mol) of the component (C-3-1) and the component (C-3-2) The ratio is arbitrary, but is generally about 80:20 to 95: 5. The reaction method of the copolymerization is arbitrary, but the monomer component (C-7-1) and the monomer component (C-7-2) are usually subjected to radical solution polymerization in the presence of a polymerization initiator such as benzoyl peroxide. As a result, the desired copolymer can be easily obtained.

  Moreover, as (C-7) component, the hydride obtained by hydrogenating the unsaturated bond which remains in the polybutene obtained as mentioned above may be sufficient.

  Moreover, although the weight average molecular weight of the copolymer which is (C-7) component is also arbitrary, the thing of 1,000-300,000 normally, Preferably 5,000-100,000 is used.

  As the component (C-7) according to the present invention, a particularly excellent carbide suppressing effect is obtained, so that a dispersed polymethacrylate having a weight average molecular weight of 5,000 to 100,000, a weight average molecular weight of 5,000 to 100,000, 000 dispersed styrene-maleic anhydride copolymer, dispersed olefin copolymer having a weight average molecular weight of 5,000 to 100,000, dispersed olefin-methacrylate copolymer having a weight average molecular weight of 5,000 to 100,000 And mixtures thereof are preferably used.

  The above-mentioned (C-1) to (C-7) carbide inhibitors may be used alone or in combination of two or more. The lubricating oil composition for a compressor of the present invention. The total content of (C-1) to (C-7) in the composition is required to be 0.001 to 10% by mass, preferably 0.01 to 5% by mass, based on the total amount of the composition. More preferably, it is 0.1-2 mass%. When the total content is less than 0.001% by mass, the carbide suppressing effect is insufficient. On the other hand, even if the content exceeds 10% by mass, the carbide suppressing effect corresponding to the content cannot be obtained.

  Although the lubricating oil composition for a compressor of the present invention contains the above components (A) to (C) as essential components, the (D) extreme pressure agent and / or ( E) An oily agent may be further contained.

  (D) As an extreme pressure agent, a sulfur type extreme pressure agent and a phosphorus type extreme pressure agent can be used, for example, More specifically, the compound shown to the following (D-1)-(D-13) is mentioned. It is done.

(D-1) Dihydrocarbyl polysulfide (D-2) Sulfurized ester (D-3) Sulfurized mineral oil (D-4) Zinc dithiophosphate (D-5) Zinc dithiocarbamate (D-6) Molybdenum dithiophosphate Compound (D-7) Molybdenum dithiocarbamate compound (D-8) Phosphate ester (D-9) Acid phosphate ester (D-10) Amine salt of acid phosphate ester (D-11) Chlorinated phosphate ester ( D-12) Phosphite (D-13) Phosphorothionate The component (D) is described below in order.

  (D-1) Dihydrocarbyl polysulfide is a sulfur compound generally called polysulfide or sulfurized olefin, and is specifically represented by the following general formula (15).

R ³⁹ -S _x -R ⁴⁰ (15)
[In General Formula (15), R ³⁹ and R ⁴⁰ may be the same or different and each represents a linear or branched alkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, carbon An alkylaryl group having 6 to 20 carbon atoms or an arylalkyl group having 6 to 20 carbon atoms is shown, and x is an integer of 2 to 6, preferably 2 to 5. ]
Specific examples of the alkyl group represented by R ³⁹ and R ⁴⁰ in the general formula (15) include an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, and a tert-butyl group. , Linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, straight Chain or branched undecyl group, linear or branched dodecyl group, linear or branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group, linear or Examples include a branched heptadecyl group, a linear or branched octadecyl group, a linear or branched nonadecyl group, and a linear or branched icosyl group.

Specific examples of the aryl group represented by R ³⁹ and R ⁴⁰ include a phenyl group and a naphthyl group.

Specific examples of the alkylaryl group represented by R ³⁹ and R ⁴⁰ include a tolyl group (including all structural isomers), an ethylphenyl group (including all structural isomers), straight-chain or branched propyl Phenyl group (including all structural isomers), linear or branched butylphenyl group (including all structural isomers), linear or branched pentylphenyl group (including all structural isomers), linear Or branched hexylphenyl group (including all structural isomers), linear or branched heptylphenyl group (including all structural isomers), straight chain or branched octylphenyl group (including all structural isomers) ), Linear or branched nonylphenyl group (including all structural isomers), linear or branched decylphenyl group (including all structural isomers), linear or branched undecylphenyl group (all Including structural isomers), Chain or branched dodecylphenyl group (including all structural isomers), xylyl group (including all structural isomers), ethylmethylphenyl group (including all structural isomers), diethylphenyl group (all structures) Isomers), di (straight or branched) propylphenyl groups (including all structural isomers), di (straight or branched) butylphenyl groups (including all structural isomers), methylnaphthyl Group (including all structural isomers), ethyl naphthyl group (including all structural isomers), linear or branched propyl naphthyl group (including all structural isomers), linear or branched butyl naphthyl group (Including all structural isomers), dimethylnaphthyl group (including all structural isomers), ethylmethylnaphthyl group (including all structural isomers), diethylnaphthyl group (including all structural isomers), J (Chain or branched) propyl naphthyl group (including all structural isomers), di (straight or branched) butyl naphthyl group (including all structural isomers), and the like.

Specific examples of the arylalkyl group represented by R ³⁹ and R ⁴⁰ include a benzyl group, a phenylethyl group (including all isomers), a phenylpropyl group (including all isomers), and the like.

R ³⁹ and R ⁴⁰ are each an alkyl group having 3 to 18 carbon atoms, an aryl group having 6 to 8 carbon atoms, an alkylaryl group having 7 to 8 carbon atoms, or carbon derived from propylene, 1-butene or isobutylene. It is preferably any one of the arylalkyl groups of formulas 7-8.

  More specifically, preferred alkyl groups include, for example, an isopropyl group, a branched hexyl group derived from a propylene dimer (including all branched isomers), and a propylene trimer. Branched nonyl group (including all branched isomers), branched dodecyl group derived from propylene tetramer (including all branched isomers), derived from propylene pentamer Branched pentadecyl group (including all branched isomers), branched octadecyl group derived from propylene hexamer (including all branched isomers), sec-butyl group, tert-butyl Group, branched octyl group derived from 1-butene dimer (including all branched isomers), branched octyl group derived from isobutylene dimer (all branched isomers) From 1-butene trimer Branched dodecyl group derived (including all branched isomers), branched dodecyl group derived from isobutylene trimer (including all branched isomers), 1-butene tetramer Branched hexadecyl groups derived from the body (including all branched isomers), branched hexadecyl groups derived from isobutylene tetramer (including all branched isomers), etc. Can do. A preferable aryl group includes, for example, a phenyl group. Preferred alkylaryl groups include, for example, tolyl groups (including all structural isomers), ethylphenyl groups (including all structural isomers), xylyl groups (including all structural isomers), and the like. it can. Preferable arylalkyl groups include, for example, benzyl group and phenethyl group (including all isomers).

Further, R ³⁹ and R ⁴⁰ are more preferably each independently a branched alkyl group having 3 to 18 carbon atoms derived from propylene, from the viewpoint of lubrication performance, and carbon derived from propylene. A branched alkyl group having a number of 6 to 15 is particularly preferable.

  (D-1) As dihydrocarbyl polysulfide, those having an arbitrary sulfur content can be used. However, from the viewpoint of excellent extreme pressure performance, the sulfur content is usually 10 to 55% by mass, preferably 20%. It is preferable to use a ˜50 mass% material.

  (D-2) Specific examples of the sulfurized ester include animal and vegetable oils and fats such as beef tallow, pork tallow, fish and fat, rapeseed oil and soybean oil; unsaturated fatty acids (oleic acid, linoleic acid and the above-mentioned animal and vegetable oils and fats) And unsaturated fatty acid esters obtained by reacting various alcohols; and mixtures thereof and the like obtained by sulfiding by any method. (D-2) As the sulfurized ester, those having an arbitrary sulfur content can be used. From the viewpoint of excellent extreme pressure performance, the sulfur content is usually 2 to 40% by mass, preferably 5 to 35% by mass. % Is preferable.

  (D-3) Sulfurized mineral oil refers to one obtained by dissolving elemental sulfur in mineral oil. The mineral oil used in the present invention is not particularly limited, and specific examples include mineral oil-based lubricant base oils mentioned as examples of the above-described lubricant base oil. In addition, as the elemental sulfur, any form such as a lump, powder, or molten liquid may be used, but a powder or molten liquid can be efficiently dissolved in the base oil. Therefore, it is preferable. When using molten liquid elemental sulfur, the liquids are mixed together, so there is an advantage that the melting operation can be performed in a very short time, but it is handled above the melting point of elemental sulfur. In addition, it is not always easy to handle because it requires a special device such as a heating facility and is dangerous because it is handled in a high temperature atmosphere. On the other hand, powdery simple sulfur is particularly preferable because it is inexpensive and easy to handle and has a sufficiently short dissolution time. Moreover, although there is no restriction | limiting in particular in sulfur content in sulfide mineral oil, Preferably it is 0.05-1.0 mass% normally on the basis of the total amount of sulfide mineral oil, More preferably, it is 0.1-0.5 mass%. .

  (D-4) Zinc dithiophosphate compound, (D-5) Zinc dithiocarbamate compound, (D-6) Molybdenum dithiophosphate, and (D-7) Molybdenum dithiocarbamate are represented by the following general formula (16), It is represented by (17), (18), (19).

［一般式（１６）〜（１９）中、Ｒ^４１、Ｒ^４２、Ｒ^４３、Ｒ^４４、Ｒ^４５、Ｒ^４６、Ｒ^４７、Ｒ^４８、Ｒ^４９、Ｒ^５０、Ｒ^５１、Ｒ^５２、Ｒ^５３、Ｒ^５４、Ｒ^５５及びＲ^５６は同一でも異なっていてもよく、それぞれ炭素数１以上の炭化水素基を示し、Ｘ^１及びＸ^２は、それぞれ酸素原子又は硫黄原子を示す。］
上記Ｒ^４１〜Ｒ^５６で示される炭化水素基としては、例えば、炭素数１〜２４のアルキル基、炭素数５〜７のシクロアルキル基、炭素数６〜１１のアルキルシクロアルキル基、炭素数２〜２４のアルケニル基、炭素数６〜１８のアリール基、炭素数７〜２４のアルキルアリール基及び炭素数７〜１２のアリールアルキル基等が挙げられる。

[In the general formula ^{(16) ~ (19),} R 41, R 42, R 43, R 44, R 45, R 46, R 47, R 48, R 49, R 50, R 51, R 52, R 53 , R ⁵⁴ , R ⁵⁵ and R ⁵⁶ may be the same or different and each represents a hydrocarbon group having 1 or more carbon atoms, and X ¹ and X ² each represent an oxygen atom or a sulfur atom. ]
Examples of the hydrocarbon group represented by R ^{41 to} R ⁵⁶ include an alkyl group having 1 to 24 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, an alkylcycloalkyl group having 6 to 11 carbon atoms, and 2 carbon atoms. -24 alkenyl group, C6-C18 aryl group, C7-C24 alkylaryl group, C7-C12 arylalkyl group, etc. are mentioned.

  Specific examples of the alkyl group having 1 to 24 carbon atoms include methyl group, ethyl group, propyl group (including all branched isomers), butyl group (including all branched isomers), and pentyl group. (Including all branched isomers), hexyl group (including all branched isomers), heptyl group (including all branched isomers), octyl group (including all branched isomers), Nonyl group (including all branched isomers), decyl group (including all branched isomers), undecyl group (including all branched isomers), dodecyl group (including all branched isomers) ), Tridecyl group (including all branched isomers), tetradecyl group (including all branched isomers), pentadecyl group (including all branched isomers), hexadecyl group (including all branched isomers) ), Heptadecyl group (all branches) ), Octadecyl group (including all branched isomers), nonadecyl group (including all branched isomers), icosyl group (including all branched isomers), heicosyl group (all Including branching isomers), docosyl groups (including all branching isomers), tricosyl groups (including all branching isomers), tetracosyl groups (including all branching isomers), etc. .

  Specific examples of the cycloalkyl group having 5 to 7 carbon atoms include a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group.

  Specific examples of the alkylcycloalkyl group having 6 to 11 carbon atoms include a methylcyclopentyl group (including all substituted isomers), an ethylcyclopentyl group (including all substituted isomers), and a dimethylcyclopentyl group (all Including substituted isomers), propylcyclopentyl group (including all branched isomers, including substituted isomers), methylethylcyclopentyl group (including all substituted isomers), trimethylcyclopentyl group (including all substituted isomers) ), Butylcyclopentyl group (including all branched and substituted isomers), methylpropylcyclopentyl group (including all branched and substituted isomers), diethylcyclopentyl group (including all substituted isomers) ), Dimethylethylcyclopentyl group (including all substituted isomers), methylcyclohex Group (including all substituted isomers), ethylcyclohexyl group (including all substituted isomers), dimethylcyclohexyl group (including all substituted isomers), propylcyclohexyl group (all branched isomers, substituted) Isomers), methylethylcyclohexyl group (including all substituted isomers), trimethylcyclohexyl group (including all substituted isomers), butylcyclohexyl group (including all branched isomers, substituted isomers) , Methylpropylcyclohexyl group (including all substituted isomers), diethylcyclohexyl group (including all substituted isomers), dimethylethylcyclohexyl group (including all substituted isomers), methylcycloheptyl Group (including all substituted isomers), ethylcycloheptyl group (all substituted isomers) ), Dimethylcycloheptyl group (including all substituted isomers), propylcycloheptyl group (including all branched and substituted isomers), methylethylcycloheptyl group (including all substituted isomers) , Trimethylcycloheptyl group (including all substituted isomers), butylcycloheptyl group (including all branched isomers, substituted isomers), methylpropylcycloheptyl group (all branched isomers, substituted isomers) ), Diethylcycloheptyl group (including all substituted isomers), dimethylethylcycloheptyl group (including all substituted isomers), and the like.

  Examples of the alkenyl group having 2 to 24 carbon atoms include a vinyl group, a propenyl group, an isopropenyl group, a butenyl group (including all branched isomers), a pentenyl group (including all branched isomers), and hexenyl. Groups (including all branched isomers), heptenyl groups (including all branched isomers), octenyl groups (including all branched isomers), nonenyl groups (including all branched isomers) , Decenyl group (including all branched isomers), linear or branched undecenyl group (including all branched isomers), dodecenyl group (including all branched isomers), tridecenyl group (all Including branching isomers), tetradecenyl group (including all branching isomers), pentadecenyl group (including all branching isomers), hexadecenyl group (including all branching isomers), heptade Nyl group (including all branched isomers), octadecenyl group (including all branched isomers) such as oleyl group, nonadecenyl group (including all branched isomers), icocenyl group (all branched isomers) Isomers), heicosenyl groups (including all branched isomers), dococenyl groups (including all branched isomers), tricosenyl groups and tetracosenyl groups (including all branched isomers), etc. It is done.

  Examples of the aryl group having 6 to 18 carbon atoms include a phenyl group and a naphthyl group.

  Examples of the alkylaryl group having 7 to 24 carbon atoms include a tolyl group (including all substituted isomers), a xylyl group (including all substituted isomers), and an ethylphenyl group (including all substituted isomers). , Propylphenyl group (including all branched isomers and substituted isomers), methylethylphenyl group (including all substituted isomers), trimethylphenyl group (including all substituted isomers), butylphenyl group (including All branched isomers, including substituted isomers, methylpropylphenyl group (including all branched isomers, including substituted isomers), diethylphenyl group (including all substituted isomers), dimethylethylphenyl group (Including all substituted isomers), pentylphenyl group (including all branched isomers, including substituted isomers), hexylphenyl group (including all branched isomers, Isomers), heptylphenyl group (all branched isomers, including substituted isomers), octylphenyl group (including all branched isomers, substituted isomers), nonylphenyl group (all branched isomers) Isomers, including substituted isomers), decylphenyl group (including all branched isomers and substituted isomers), undecylphenyl group (including all branched isomers and substituted isomers), dodecylphenyl group (Including all branched isomers and substituted isomers), tridecylphenyl group (including all branched isomers and substituted isomers), tetradecylphenyl group (all branched isomers and substituted isomers) ), Pentadecylphenyl group (including all branched isomers and substituted isomers), hexadecylphenyl group (including all branched isomers and substituted isomers), heptadecylphenyl group (all branched isomers) Sex body, including isomers), an octadecyl group (including all the branched isomers and substituted isomers) and the like.

  Examples of the arylalkyl group having 7 to 12 carbon atoms include benzyl group, phenethyl group, phenylpropyl group (including all branched isomers), phenylbutyl group (including all branched isomers), and the like. It is done.

Among the compounds represented by the general formulas (16) to (19), the (D-4) zinc dithiophosphate compound represented by the general formula (16) is preferable, and R ⁴¹ , R ⁴² , R ⁴³ and R Each of ⁴⁴ is preferably an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, or an alkylaryl group having 7 to 18 carbon atoms, and more preferably an alkyl group having 3 to 8 carbon atoms. In addition, when introducing R ^{41 to} R ⁴⁴ , a mixture of α-olefins may be used as a raw material. In this case, the compound represented by the general formula (16) is a dialkyldithiophosphorus having an alkyl group having a different structure. It becomes a mixture of zinc acid.

  (D-4) More preferable examples of the zinc dithiophosphate compound include zinc di (2-ethylhexyl) dithiophosphate, zinc di (1,3-dimethylbutyl) dithiophosphate, zinc diisopropyldithiophosphate and the like. Or a mixture of two or more thereof.

  Specific examples of the (D-8) phosphate ester include tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, triundecyl phosphate, triundecyl phosphate. Dodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, triheptadecyl phosphate, trioctadecyl phosphate, trioleyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, Examples thereof include zildiphenyl phosphate and xylenyl diphenyl phosphate.

  (D-9) Specific examples of the acidic phosphate ester include monobutyl acid phosphate, monopentyl acid phosphate, monohexyl acid phosphate, monoheptyl acid phosphate, monooctyl acid phosphate, monononyl acid phosphate, monodecyl acid Phosphate, monoundecyl acid phosphate, monododecyl acid phosphate, monotridecyl acid phosphate, monotetradecyl acid phosphate, monopentadecyl acid phosphate, monohexadecyl acid phosphate, monoheptadecyl acid phosphate, monooctadecyl acid phosphate, monooleyl Acid phosphate, dibutyl acid phosphate, dipentyl acid phosphate , Dihexyl acid phosphate, diheptyl acid phosphate, dioctyl acid phosphate, dinonyl acid phosphate, didecyl acid phosphate, diundecyl acid phosphate, didodecyl acid phosphate, ditridecyl acid phosphate, ditetradecyl acid pentadecyl phosphate Examples include acid phosphate, dihexadecyl acid phosphate, diheptadecyl acid phosphate, dioctadecyl acid phosphate, and dioleyl acid phosphate.

  (D-10) The amine salt of the acidic phosphate ester includes methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, dimethylamine, diethylamine and dipropyl of the acidic phosphate ester. With amines such as amine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, dioctylamine, trimethylamine, triethylamine, tripropylamine, tributylamine, tripentylamine, trihexylamine, triheptylamine, and trioctylamine Salt.

  Examples of (D-11) chlorinated phosphate esters include tris-dichloropropyl phosphate, tris-chloroethyl phosphate, tris-chlorophenyl phosphate, and polyoxyalkylene bis [di (chloroalkyl)] phosphate.

  (D-12) As phosphites, dibutyl phosphite, dipentyl phosphite, dihexyl phosphite, diheptyl phosphite, dioctyl phosphite, dinonyl phosphite, didecyl phosphite, diundecyl phosphite, didodecyl phosphite Phosphite, dioleyl phosphite, diphenyl phosphite, dicresyl phosphite, tributyl phosphite, tripentyl phosphite, trihexyl phosphite, triheptyl phosphite, trioctyl phosphite, trinonyl phosphite, tridecyl phosphite , Triundecyl phosphite, tridodecyl phosphite, trioleyl phosphite, triphenyl phosphite, and tricresyl phosphite.

  Specific examples of (D-13) phosphorothioate include tributyl phosphorothioate, tripentyl phosphorothioate, trihexyl phosphorothioate, triheptyl phosphorothioate, and trioctyl phosphorothioate. , Trinonyl phosphorothioate, tridecyl phosphorothioate, triundecyl phosphorothioate, tridodecyl phosphorothionate, tritridecyl phosphorothionate, tritetradecyl phosphorothionate, tripentadecyl phosphorothioate Thionate, trihexadecyl phosphorothioate, triheptadecyl phosphorothionate, trioctadecyl phosphorothionate, trioleyl phosphorothionate, triphenylphospho Phosphorothioate, tricresyl phosphorothionate, trixylenyl phosphorothioate, cresyl diphenyl phosphorothioate, xylenyl diphenyl phosphorothioate, tris (n-propylphenyl) phosphorothionate, tris (Isopropylphenyl) phosphothioate, Tris (n-butylphenyl) phosphothionate, Tris (isobutylphenyl) phosphothionate, Tris (s-butylphenyl) phosphothionate, Tris (t-butylphenyl) And phosphorothioate. A mixture of two or more of these can also be used.

  The component (D) used in the present invention is preferably a (D-4) zinc dithiophosphate compound from the viewpoint of obtaining high extreme pressure properties and carbide suppression properties.

  The content of the component (D) in the compressor lubricating oil composition of the present invention is arbitrary, but is preferably 5% by mass or less, more preferably 3% by mass or less, and still more preferably 1% by mass based on the total amount of the composition. % Or less, most preferably 0.5% by mass or less. Even if the content exceeds 5% by mass, there is no further improvement effect of extreme pressure properties commensurate with the content, and an increase in carbides and sludge may be caused, which is not preferable. On the other hand, the content of the component (D) is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, further preferably 0.02% by mass or more, and most preferably 0, based on the total amount of the composition. 0.05% by mass or more. When the content of the component (D) is less than 0.001% by mass, the effect of improving the lubricity due to the addition tends to be insufficient, such being undesirable.

  (E) The oily agent is not particularly limited as long as it is an oily agent used as an oily agent for lubricating oil, but at least one selected from the following (E-1) to (E-3) from the viewpoint of lubricity. It is preferable to use a seed oily agent.

(E-1) Ester (E-2) Monohydric alcohol (E-3) Carboxylic acid.

  (E-1) The alcohol constituting the ester may be a monohydric alcohol or a polyhydric alcohol. Further, the carboxylic acid constituting the ester may be either a monobasic acid or a polybasic acid.

  As the monohydric alcohol, one having 1 to 24 carbon atoms is usually used, and such alcohol may be either linear or branched. Specific examples of the monohydric alcohol having 1 to 24 carbon atoms include methanol, ethanol, linear or branched propanol, linear or branched butanol, linear or branched octanol, and linear Linear or branched decanol, linear or branched undecanol, linear or branched dodecanol, linear or branched tridecanol, linear or branched Tetradecanol, linear or branched pentadecanol, linear or branched hexadecanol, linear or branched heptadecanol, linear or branched octadecanol, linear -Like or branched nonadecanol, linear or branched eicosanol, linear or branched heneicosanol, linear or branched tricosanol, linear or branched Tetracosanol, and mixtures thereof.

  As the polyhydric alcohol, those having 2 to 10 valences, preferably 2 to 6 valences are usually used. Specific examples of the 2- to 10-valent alcohol include ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene glycol), 1,3-propanediol, 1,2-propanediol, and 1,3-butane. Diol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, 1,2-propanediol, 1,3-pentanediol, 1,4-pentane Dihydric alcohols such as diol, 1,5-pentanediol, neopentyl glycol; glycerin, polyglycerin (diglycerin di-octamer such as diglycerin, triglycerin, tetraglycerin), trimethylol alkane (trimethylolethane, Trimethylolpropane, trimethylolbutane, etc. And 2-8 mer thereof, pentaerythritol, and 2-8 mer thereof, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1, Polyhydric alcohols such as 2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol; xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, Examples thereof include sugars such as cellobiose, maltose, isomaltose, trehalose and sucrose, and a mixture of two or more thereof.

  Among these, ethylene glycol, diethylene glycol, polyethylene glycol (preferably ethylene glycol 3-10 mer), propylene glycol, dipropylene glycol, polypropylene glycol (preferably 3-10 weight propylene glycol), 1,3 -Propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylolalkane (trimethylolethane, trimethylolpropane, Trimethylolbutane and the like, and dimers and tetramers thereof, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hex Ntorioru, 1,2,3,4 butane tetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, 2-6 monohydric alcohol xylitol, and mixtures of two or more of these are preferred. More preferred are ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, sorbitan, and mixtures of two or more thereof.

  On the other hand, as the monobasic acid among the carboxylic acids constituting the ester, a fatty acid having 6 to 24 carbon atoms is usually used. Such monobasic acid may be either linear or branched, and may be either saturated or unsaturated. Specifically, linear or branched hexanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear Or branched undecanoic acid, linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear Or branched hexadecanoic acid, linear or branched octadecanoic acid, linear or branched hydroxyoctadecanoic acid, linear or branched nonadecanoic acid, linear or branched eicosanoic acid, linear Saturated fatty acids such as linear or branched heneicosanoic acid, linear or branched docosanoic acid, linear or branched tricosanoic acid, linear or branched tetracosanoic acid; linear or branched Hexenoic acid, linear or branched Heptenoic acid, linear or branched octenoic acid, linear or branched octenoic acid, linear or branched nonenic acid, linear or branched decenoic acid, linear or branched Undecenoic acid, linear or branched dodecenoic acid, linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, linear or branched Hexadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxyoctadecenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or Unsaturated fatty acids such as branched heneicosenoic acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, linear or branched tetracosenoic acid, and mixtures of two or more of these Can be mentioned. Among these, C8-20 saturated fatty acids, C8-20 unsaturated fatty acids, and mixtures of two or more thereof are preferred.

  Moreover, as a polybasic acid which comprises ester, a C2-C16 dibasic acid, trimellitic acid, etc. are mentioned. The dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be either saturated or unsaturated. Specifically, ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, linear or Branched octanedioic acid, linear or branched nonanedioic acid, linear or branched decanedioic acid, linear or branched undecanedioic acid, linear or branched dodecanedioic acid , Linear or branched tridecanedioic acid, linear or branched tetradecanedioic acid, linear or branched heptadecanedioic acid, linear or branched hexadecanedioic acid; linear or branched Hexenedioic acid, linear or branched octenedioic acid, linear or branched nonene diacid, linear or branched decenedioic acid, linear or branched undecenedioic acid, Linear or branched dodecenedioic acid, linear or branched tridecenedioic acid, linear or Tetradecene diacid 岐状, linear or branched heptadecenoic acid, straight-chain or branched hexadecene diacid, and mixtures of two or more thereof.

  The combination of the alcohol and the carboxylic acid in the ester oily agent is arbitrary, and examples include the combinations shown in the following (E-1-1) to (E-1-7).

(E-1-1) ester of monohydric alcohol and monobasic acid (E-1-2) ester of polyhydric alcohol and monobasic acid (E-1-3) of monohydric alcohol and polybasic acid Esters (E-1-4) Esters of polyhydric alcohols and polybasic acids (E-1-5) Esters of monohydric alcohols and mixed alcohols of polyhydric alcohols and polybasic acids (E-1-6) Ester of monohydric alcohol and monobasic acid and mixed carboxylic acid of polybasic acid (E-1-7) Ester of mixed alcohol of monohydric alcohol and polyhydric alcohol and mixed carboxylic acid of monobasic acid and polybasic acid.

  When a polyhydric alcohol is used as the alcohol component, the resulting ester may be a complete ester in which all the hydroxyl groups in the polyhydric alcohol are esterified. It may be a partial ester remaining as it is. In addition, when a polybasic acid is used as the carboxylic acid component, it may be a complete ester in which all the carboxyl groups in the polybasic acid are esterified. It may be a partial ester remaining.

  Among the combinations shown in the above (E-1-1) to (E-1-7), an ester of (E-1-1) a monohydric alcohol and a monobasic acid is preferable because it is more excellent in lubricity. .

  The total number of carbon atoms of the ester (E-1) used as the oily agent in the present invention is not particularly limited, but the total number of carbon atoms of the ester is preferably 7 or more and more preferably 9 or more from the viewpoint of excellent lubricity improvement effect. 11 or more is more preferable. The total carbon number of the ester is preferably 26 or less, more preferably 24 or less, and even more preferably 22 or less.

  Examples of the (E-2) monohydric alcohol used as the oily agent include the monohydric alcohols exemplified in the description of the (E-1) ester. The number of carbon atoms of the monohydric alcohol is preferably 6 or more, more preferably 8 or more, and even more preferably 10 or more from the viewpoint of more excellent lubricity. Moreover, 20 or less are preferable, as for carbon number of monohydric alcohol, 18 or less are more preferable, and 16 or less are further more preferable.

  The (E-3) carboxylic acid used as the oiliness agent may be either a monobasic acid or a polybasic acid, or a mixture thereof. Examples of the monobasic acid and the polybasic acid include the monobasic acid and the polybasic acid exemplified in the description of the above (E-1) ester. Among these, monobasic acids are preferable from the viewpoint of more excellent lubricity, and the number of carbon atoms of the carboxylic acid is preferably 6 or more, more preferably 8 or more, and even more preferably 10 or more from the viewpoint of more excellent lubricity. On the other hand, the carbon number of the carboxylic acid is preferably 20 or less, more preferably 18 or less, and even more preferably 16 or less.

  In the lubricating oil composition for a compressor of the present invention, only one of the oil agents (E-1) to (E-3) may be used alone, or two or more may be combined. However, since the lubricity can be further improved, an ester having a total carbon number of 7 to 26 obtained from a monohydric alcohol and a monobasic acid, a monohydric alcohol having a carbon number of 6 to 20, a monobasic acid having a carbon number of 6 to 20, A mixture of two or more of these is preferred.

  The total content of the (E) oily agent in the compressor lubricating oil composition of the present invention is preferably 0.1 to 15% by mass based on the total amount of the composition. That is, from the viewpoint of lubricity, the total content is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and further preferably 0.5% by mass or more. In addition, the total content is preferably 15% by mass or less, more preferably 12% by mass or less, and still more preferably 10% by mass or less.

  The lubricating oil composition for a compressor of the present invention has a lubricating oil additive other than the above (B) to (E), for example, a rust inhibitor, a corrosion inhibitor, a pour point depressant, for the purpose of further enhancing various performances. An agent, an antifoaming agent, etc. can be mix | blended individually or in combination of several types.

  Examples of the rust inhibitor include aliphatic amines, organic sulfonic acid metal salts, organic phosphoric acid metal salts, alkenyl succinic acid esters, polyhydric alcohol esters, and the like.

  Examples of the corrosion inhibitor include benzotriazole-based, thiadiazole-based, and imidazole-based compounds.

  Pour point depressants include polymethacrylate polymers that are compatible with lubricating base oils.

  Examples of the antifoaming agent include silicones such as dimethyl silicone.

  The amount of these additives can be arbitrarily selected, but the content of each additive based on the total amount of the lubricating oil composition is usually 0.01 to 5.0% by mass for pour point depressants and rust. It is desirable to blend so as to be 0.01 to 3.0% by mass for the stopper and the corrosion inhibitor, and 0.00001 to 0.05% by mass for the antifoaming agent.

  The lubricating oil composition for a compressor of the present invention can be used as a lubricating oil for a compressor of any type, and is particularly suitable as a lubricating oil for a reciprocating compressor. In particular, when used in a reciprocating compressor having a discharge gas pressure of 0.3 MPa or more and / or a discharge gas temperature of 80 ° C. or more, the effect of the present invention is more exhibited. For the same reason, the discharge gas pressure is preferably 0.35 MPa or more, more preferably 0.4 MPa or more, and even more preferably 0.45 MPa or more. On the other hand, the discharge gas pressure is preferably 100 MPa or less, more preferably 75 MPa or less, and even more preferably 50 MPa or less. The discharge gas temperature is preferably 90 ° C. or higher, more preferably 100 ° C. or higher, and even more preferably 110 ° C. or higher. On the other hand, the discharge gas temperature is preferably 400 ° C. or lower, more preferably 350 ° C. or lower, and even more preferably 300 ° C. or lower.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example at all.

[Examples 1 to 10, Comparative Examples 1 and 2]
Lubricating oil compositions of the present invention (Examples 1 to 10) and comparative lubricating oil compositions (Comparative Examples 1 and 2) were prepared according to the compositions shown in Table 1, respectively. In addition, each component used is as follows.

(A) Base oil:
A1: Diester of phthalic acid and octanol (kinematic viscosity at 40 ° C .: 46 mm ² / s)
A2: Triester of trimellitic acid and octanol (kinematic viscosity at 40 ° C .: 90 mm ² / s)
(B) Polybutene or its hydride:
B1: Hydride of polyisobutene (number average molecular weight: 450)
(C) Carbide inhibitor:
C1: alkylphenyl-α-naphthylamine having a branched alkyl group having 12 carbon atoms C2: dialkyldiphenylamine having a branched alkyl group having 8 carbon atoms C3: bis (3,5-di-tert-butyl-4-hydroxyphenyl) methane (D) Extreme pressure agent:
D1: Zinc dithiophosphate having an alkyl group having 8 carbon atoms (F) Other additives:
F1: Sorbitan monooleate (rust inhibitor)
F2: Dimethylpolysiloxane (antifoaming agent)
Next, bench scale actual machine tests were performed using the lubricating oil compositions of Examples 1 to 10 and Comparative Examples 1 and 2, and (1) carbide suppression and (2) lubricity were evaluated. The test equipment and test conditions are shown below.

Test equipment: Single-stage reciprocating compressor (motor output: 2.2 kW)
Compressed gas: Air Discharge pressure: 0.8 ± 0.1 MPa
Discharge air temperature: 240 ° C
Test time: 200 hours.
(1) Evaluation of Carbide Inhibition The amount of carbide produced (adhesion amount) in the discharge valve after the test was visually observed, and the carbide inhibition was evaluated based on the following criteria. The results are shown in Table 1.

5: Almost no carbide adheres 4: Little carbide adheres 3: The carbide adheres thinly on the entire surface 2: The carbide adheres with a thickness on the entire surface 1: The carbide adheres thickly on the entire surface Clogging has occurred in a part of the valve hole.
(2) Evaluation of lubricity The number and depth of vertical scratches in the ring land portion of the piston top portion after the test were visually observed, and the lubricity was evaluated based on the following criteria. The results are shown in Table 1.

5: No vertical scratches 4: Slight vertical scratches 3: Longitudinal but shallow wounds 2: Many vertical but shallow wounds 1: Many vertical wounds, deep wounds is there.

Claims (2)

Esters as base oil, based on the total composition,
0.001 to 10% by mass of polybutene or a hydride thereof,
Amine compounds, phenol compounds, sulfonate compounds, phenate compounds, salicylate compounds, succinimide compounds, and at least one compound represented by the following general formulas (1) to (3) and the following general formula (4), 0.001 to 10% by mass of at least one carbide inhibitor selected from a copolymer with at least one of the compounds represented by (5) and a hydride thereof;
And used in a compressor that compresses and sends out at least one gas selected from air, nitrogen gas, oxygen gas, ammonia gas, hydrocarbon gas, combustion exhaust gas, combustion gas, CO ₂ gas and CO gas A lubricating oil composition for a compressor characterized by the above.

[Wherein R ¹ , R ³ , R ⁷ and R ⁹ each represent a hydrogen atom or a methyl group, R ² represents an alkyl group, R ⁴ represents a hydrocarbon group, and R ⁵ and R ⁶ may be the same. May be different,
Each represents a hydrogen atom, an alkoxy group or a monoalkylamino group; R ⁸ represents an alkylene group; Y ¹ and Y ² each represent an amine residue having 1 or 2 nitrogen atoms and 0 to 2 oxygen atoms. Represents a group or a heterocyclic residue, j represents 0 or 1; ] The number average molecular weight of the polybutene or hydride thereof is 200 to 10,000, the content of the polybutene or hydride thereof is 0.001 to 10% by mass based on the total amount of the composition, and the carbonization inhibitor is amine-based. The compressor according to claim 1, wherein the compressor is at least one selected from a compound and a phenol compound, and the content of the carbide inhibitor is 0.01 to 5% by mass based on the total amount of the composition. Lubricating oil composition.