JP5564166B2 - Lubricating oil additive composition, manufacturing method of lubricating oil additive composition, and manufacturing method of lubricating oil composition - Google Patents

Description

  The present invention relates to a lubricating oil additive composition, a lubricating oil composition, and methods for producing them.

  In various mechanical devices such as an internal combustion engine and a transmission, a lubricating oil composition is used for smooth driving and operation. In particular, a lubricating oil (engine oil) for an internal combustion engine needs to have a performance that can be used under severe conditions in accordance with higher performance and higher output of the internal combustion engine.

  In order to satisfy such required performance, various additives such as an antiwear agent, a metallic detergent, an ashless dispersant, and an antioxidant are blended in the engine oil. (See, for example, Patent Documents 1 to 3 below.)

  By the way, recently, with the environmental problem attracting attention, improvement in fuel efficiency of engine oil is strongly demanded. In order to meet such a demand, use of a high viscosity index base oil or various friction modifiers for engine oil has been studied (for example, see Patent Document 4 below).

In addition, in order to improve fuel economy and low friction properties of lubricating oil compositions such as engine oil, the viscosity of the lubricating base oil is reduced and the amount of the viscosity index improver is increased. ing. For this reason, the usage amount of the viscosity index improver is increasing, and the viscosity index improver plays an increasingly important role as an additive of the lubricating oil composition.
JP 2001-279287 A JP 2002-129182 A JP 08-302378 A Japanese Patent Laid-Open No. 06-306384

  A viscosity index improver, which is a type of lubricating oil additive composition, has a significantly higher viscosity than other lubricating oil additive compositions. The lubricating oil composition obtained by blending the lubricating oil additive composition and the lubricating base oil usually needs to be adjusted in viscosity at the production stage. For this reason, viscosity index improvers are generally handled individually without being packaged with other lubricant additives.

  A poly (meth) acrylate compound having a weight average molecular weight (Mw) of 150,000 to 1,000,000 is used as an active ingredient of the viscosity index improver (a polymer component having an effect of improving the viscosity index), and the weight average molecular weight. The viscosity index improver tends to have a higher viscosity as the use of a larger value (Mw: 350,000 to 1,000,000) is used.

  In order to give the viscosity index improver a certain fluidity and improve handling, it is generally handled in a state diluted with a diluent, but the content of the diluent is increased in order to ensure sufficient fluidity. If it is too high, the content of the active ingredient of the viscosity index improver is lowered, and the distribution efficiency is deteriorated. In addition, in order to obtain a predetermined effect of improving the viscosity index, the amount added to the lubricating base oil increases as a result, resulting in deterioration in logistics efficiency and an increase in cost due to an increased amount added to the lubricating oil. In addition, when a low-viscosity diluent is used, the effect on the performance of the lubricating oil composition (evaporation loss and lubrication characteristics due to the low-viscosity diluent, sulfur content, nitrogen content, aromatics contained in the diluent) There is a concern about the influence of heat and oxidation stability due to the minute etc.).

  On the other hand, as another means for improving the fluidity of the lubricating oil additive composition, it is possible to appropriately warm the viscosity index improver and the lubricating oil composition at the distribution stage and the manufacturing stage of the lubricating oil composition. . However, such heating tends to cause deterioration of the viscosity index improver and deterioration of the storage stability of the lubricating oil composition.

  This invention is made | formed in view of the said situation, and it aims at providing the lubricating oil additive composition which had the outstanding viscosity index improvement effect and the outstanding fluidity | liquidity. It is another object of the present invention to provide a method for easily producing such a lubricating oil additive composition. Furthermore, by including such a lubricating oil additive composition, a lubricating oil composition having a sufficiently high viscosity index and sufficiently reduced volatility, and such a lubricating oil composition are easily produced. It aims to provide a way to do.

  In order to achieve the above object, the present invention comprises (A) a poly (meth) acrylate compound, (B) a diluent, and (C) a group consisting of N—H bond, O—H bond, and S—H bond. A lubricating oil additive composition comprising an organic compound having at least one selected bond is provided.

  The lubricating oil additive composition of the present invention has both excellent fluidity and an excellent viscosity index improvement effect. That is, the lubricating oil additive composition of the present invention comprises (B) a diluent and (C) an organic compound having at least one bond selected from the group consisting of NH bond, OH bond, and SH bond. Since the compound is contained, excellent fluidity can be secured even if the content of the diluent (B) is reduced. Further, since the content of the active ingredient (A) poly (meth) acrylate compound can be increased while maintaining fluidity, an excellent viscosity index improvement effect is obtained when blended with a lubricating base oil. be able to. In addition, since the content of the diluent (B) can be reduced, the transportation cost can be reduced by improving the distribution efficiency and the environmental load during transportation can be reduced, and the production of a lubricating oil additive composition and a lubricating oil composition can be achieved. The cost can be reduced and the volatility of the lubricating oil composition can be improved.

  In the lubricating oil additive composition of the present invention, the organic compound (C) is composed of (C1) an amine compound, (C2) a monohydric alcohol, (C3) a polyhydric alcohol, and (C4) a portion of the polyhydric alcohol. It is preferable to contain at least one compound selected from the group consisting of an ester, (C5) a partial ether of the polyhydric alcohol, and (C6) a phenol compound. Thereby, even if the content of the diluent (B) is reduced, a lubricating oil additive composition having more excellent fluidity can be obtained. Moreover, since the content of the (A) poly (meth) acrylate compound, which is an active ingredient, can be further increased, a more excellent viscosity index improvement effect can be obtained when blended with a lubricating base oil.

  In the present invention, at least one selected from the group consisting of (A) a poly (meth) acrylate compound, (B) a diluent, and (C) an N—H bond, an O—H bond, and an S—H bond. Provided is a method for producing a lubricating oil additive composition in which an organic compound having a bond is mixed. The lubricating oil additive composition obtained by this production method has excellent fluidity and excellent viscosity index improvement effect.

  The present invention also provides a lubricating oil composition comprising a lubricating base oil and the above lubricating oil additive composition. Such lubricating oil compositions have a sufficiently high viscosity index and a sufficiently reduced volatility.

  The present invention also provides a method for producing a lubricating oil composition comprising mixing a lubricating base oil and the lubricating oil additive composition. Since the lubricating oil additive composition has excellent fluidity, it has excellent handling properties, and the lubricating oil composition can be easily produced. Such lubricating oil compositions also have a sufficiently high viscosity index and a sufficiently reduced volatility.

  According to the present invention, it is possible to provide a lubricating oil additive composition having both an excellent viscosity index improving effect and an excellent fluidity. Moreover, the method of manufacturing such a lubricating oil additive composition easily can be provided. Furthermore, by including such a lubricating oil additive composition, a lubricating oil composition having a sufficiently high viscosity index and sufficiently reduced volatility, and such a lubricating oil composition are easily produced. A method can be provided.

  Further, according to the present invention, the transportation cost by improving the logistics efficiency of the lubricating oil additive composition, the reduction of environmental burden during transportation, and the manufacturing cost of the lubricating oil additive composition and the lubricating oil composition are sufficiently reduced. be able to.

  Hereinafter, preferred embodiments of the lubricating oil additive composition and the lubricating oil composition of the present invention will be described.

  The lubricating oil additive composition of the present embodiment contains (A) a poly (meth) acrylate-based compound, that is, a component (A). This poly (meth) acrylate compound has a function as a viscosity index improver and / or a pour point depressant. In addition, the “poly (meth) acrylate compound” in this specification is a general term for a polyacrylate compound and a polymethacrylate compound.

  (A) The poly (meth) acrylate compound is a polymer of a polymerizable monomer containing a (meth) acrylate monomer (hereinafter referred to as “monomer M-1”) represented by the following general formula (1). Is preferred. (A) The poly (meth) acrylate compound may be a composite polymer of the monomer M-1 and an olefin compound (ethylene, α-olefin, styrene, isobutylene, diene, maleic acid, etc.).

［一般式（１）中、Ｒ^１は水素又はメチル基を示し、Ｒ^２は炭素数１〜２００の直鎖状又は分枝状の炭化水素基を示す。］

[In General Formula (1), R ¹ represents hydrogen or a methyl group, and R ² represents a linear or branched hydrocarbon group having 1 to 200 carbon atoms. ]

Examples of the linear or branched hydrocarbon group having 1 to 200 carbon atoms represented by R ² in the general formula (1) include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group. , Alkyl groups such as heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tetradecyl group, hexadecyl group, octadecyl group, icosyl group, docosyl group, tetracosyl group, etc. Alkenyl groups such as butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tetradecenyl, hexadecenyl, octadecenyl, etc. (these alkenyl groups are It may be linear or branched, and the position of the double bond is arbitrary).

  A typical (A) poly (meth) acrylate-based compound is a so-called non-dispersed poly (meth) acrylate obtained by homopolymerization of only one type of monomer M-1 or copolymerization of two or more types.

  The (A) poly (meth) acrylate compound is composed of the monomer M-1, the (meth) acrylate monomer represented by the general formula (2) (hereinafter referred to as “monomer M-2”), and the general formula (3). ), A so-called dispersed poly (meth) acrylate obtained by copolymerization with one or more monomers selected from the group consisting of monomers (hereinafter referred to as “monomer M-3”).

［一般式（２）中、Ｒ^３は水素原子又はメチル基を示し、Ｒ^４は炭素数１〜１８のアルキレン基を示し、Ｅ^１は窒素原子を１〜２個、酸素原子を０〜２個含有するアミン残基又は複素環残基を示し、ａは０又は１を示す。］

[In General Formula (2), R ³ represents a hydrogen atom or a methyl group, R ⁴ represents an alkylene group having 1 to 18 carbon atoms, E ¹ represents ¹ to 2 nitrogen atoms, and 0 to 2 oxygen atoms. Each represents an amine residue or a heterocyclic residue, and a represents 0 or 1. ]

Specific examples of the alkylene group having 1 to 18 carbon atoms represented by R ⁴ in the general formula (2) include an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, and an octylene group. Nonylene group, decylene group, undecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group, hexadecylene group, heptadecylene group, and octadecylene group (these alkylene groups may be linear or branched). it can.

Specific examples of the amine residue or heterocyclic residue represented by E ¹ in the general formula (2) include a dimethylamino group, a diethylamino group, a dipropylamino group, a dibutylamino group, an anilino group, and a toluidino group. , Xylidino group, acetylamino group, benzoylamino group, morpholino group, pyrrolyl group, pyrrolino group, pyridyl group, methylpyridyl group, pyrrolidinyl group, piperidinyl group, quinonyl group, pyrrolidonyl group, pyrrolidono group, imidazolino group, pyrazino group, etc. Can be illustrated.

［一般式（３）中、Ｒ^５は水素原子又はメチル基を示し、Ｅ^２は窒素原子を１〜２個、酸素原子を０〜２個含有するアミン残基又は複素環残基を示す。］

[In General Formula (3), R ⁵ represents a hydrogen atom or a methyl group, and E ² represents an amine residue or a heterocyclic residue containing 1 to 2 nitrogen atoms and 0 to 2 oxygen atoms. ]

Specific examples of the amine residue or heterocyclic residue represented by E ² in the general formula (3) include a dimethylamino group, a diethylamino group, a dipropylamino group, a dibutylamino group, an anilino group, and a toluidino group. , Xylidino group, acetylamino group, benzoylamino group, morpholino group, pyrrolyl group, pyrrolino group, pyridyl group, methylpyridyl group, pyrrolidinyl group, piperidinyl group, quinonyl group, pyrrolidonyl group, pyrrolidono group, imidazolino group, pyrazino group, etc. Can be illustrated.

  The amine residue in the general formulas (2) and (3) refers to a monovalent group obtained by removing the hydrogen of the amino group from the amine, and the heterocyclic residue constitutes a heterocyclic ring from a molecule having a heterocyclic structure. A monovalent group excluding hydrogen bonded to carbon.

  Preferred specific examples of monomer M-2 and monomer M-3 include dimethylaminomethyl methacrylate, diethylaminomethyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-methyl-5-vinylpyridine, morpholinomethyl methacrylate, morpholinoethyl methacrylate. , N-vinylpyrrolidone, and mixtures thereof.

  (A) The poly (meth) acrylate compound is composed of a monomer represented by the general formula (1) and one or more monomers selected from the following general formulas (4) and (5) (hereinafter referred to as “monomer M”). -4 "and" monomer M-5 ") may be a so-called composite polymer. Among the composite polymers, a (meth) acrylate-olefin copolymer is preferable.

［一般式（４）中、Ｒ^８８は水素又はメチル基を示し、Ｒ^８９は炭素数１〜５００の炭化水素基を示す。］

[In General Formula (4), R ⁸⁸ represents hydrogen or a methyl group, and R ⁸⁹ represents a hydrocarbon group having 1 to 500 carbon atoms. ]

Specific examples of the hydrocarbon group having 1 to 500 carbon atoms represented by R ⁸⁹ in the general formula (4) include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, and a heptyl group. Alkyl groups such as octyl group, nonyl group, decyl group, undecyl group, dodecyl group (these alkyl groups may be linear or branched); butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, Nonenyl group, decenyl group, undecenyl group, dodecenyl group and other alkenyl groups (these alkenyl groups may be linear or branched, and the position of the double bond is arbitrary); cyclopentyl group, cyclohexyl group, cycloheptyl group A cycloalkyl group having 5 to 7 carbon atoms such as methylcyclopentyl group, dimethylcyclopentyl group, and methylethylcyclopentyl group. , Diethylcyclopentyl group, methylcyclohexyl group, dimethylcyclohexyl group, methylethylcyclohexyl group, diethylcyclohexyl group, methylcycloheptyl group, dimethylcycloheptyl group, methylethylcycloheptyl group, diethylcycloheptyl group, etc. Alkylcycloalkyl group (the substitution position of these alkyl groups to the cycloalkyl group is arbitrary); aryl groups such as phenyl group and naphthyl group; tolyl group, xylyl group, ethylphenyl group, propylphenyl group, butylphenyl group, Each alkylaryl group having 7 to 12 carbon atoms such as a pentylphenyl group and a hexylphenyl group (these alkyl groups may be linear or branched, and the substitution position on the aryl group is also arbitrary); a benzyl group, Phenylethyl group, phenyl Propyl group, a phenyl butyl group, a phenyl pentyl group, each phenyl alkyl group having 7 to 12 carbon atoms such as a phenyl hexyl group (the alkyl group may be branched straight-chain); can be exemplified, and the like.

［一般式（５）中、Ｄ^１及びＤ^２は、それぞれ独立に、水素原子、炭素数１〜１８のアルキルアルコールの残基（−ＯＲ^９０：Ｒ^９０は炭素数１〜１８のアルキル基）又は炭素数１〜１８のモノアルキルアミンの残基（−ＮＨＲ^９１：Ｒ^９１は炭素数１〜１８のアルキル基）を示す。］

[In General Formula (5), D ¹ and D ² are each independently a hydrogen atom or a residue of an alkyl alcohol having 1 to 18 carbon atoms (—OR ⁹⁰ : R ⁹⁰ is an alkyl group having 1 to 18 carbon atoms). or monoalkylamine residue having 1 to 18 carbon atoms ^{(-NHR 91: R} 91 is an alkyl group having 1 to 18 carbon atoms). ]

Examples of the residue of the alkyl alcohol represented by D ¹ and D ² in the general formula (5) include methanol, ethanol, linear or branched propanol, linear or branched butanol, and linear Linear or branched pentanol, linear or branched hexanol, linear or branched heptanol, linear or branched octanol, linear or branched nonanol, straight 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, etc. Residue. A residue here means the monovalent group remove | excluding the hydrogen of the hydroxyl group from the alkyl alcohol.

Examples of the residue of the monoalkylamine represented by D ¹ and D ² in the general formula (5) include amine residues having an alkyl group having 1 to 18 carbon atoms such as methylamine, ethylamine, and propylamine. It is done. A residue here means the monovalent group remove | excluding the hydrogen of the amino group from the amine.

  (A) The poly (meth) acrylate compound is selected from monomer M-1, at least one monomer selected from monomer M-2 and monomer M-3, and monomer M-4 and monomer M-5. A so-called dispersion type composite polymer obtained by copolymerization with at least one kind of monomer may be used, and a dispersion type (meth) acrylate-olefin copolymer may be preferable.

  There is no particular limitation on the copolymerization molar ratio of the copolymer of monomer M-1 and monomers M-2 and M-3, but M-1: M-2 and M-3 are preferably 99: 1 to 1. 80:20, more preferably 98: 2-85: 15, still more preferably 95: 5-90: 10.

  There is no particular limitation on the copolymerization molar ratio of the copolymer of the monomer M-1 and the monomers M-2, M-3, M-4 and M-5 (M-2 to M-5). 1: M-2 to M-5 are preferably 99: 1 to 20:80, more preferably 95: 5 to 40:60, and still more preferably 90:10 to 50:50.

  (A) The manufacturing method of a poly (meth) acrylate type compound is arbitrary. For example, in the presence of a polymerization initiator such as benzoyl peroxide, a mixture of monomer M-1 and monomers M-2 to M-3 is used. It can be easily obtained by radical solution polymerization.

(A) a weight average molecular weight of the poly (meth) acrylate compound _{(M W)} is preferably 5,000 or more, more preferably 50,000 or more, further to be 100,000 or more It is preferably 200,000 or more, and most preferably 300,000 or more.

The weight average molecular weight (M _w ) is preferably 1,000,000 or less, more preferably 700,000 or less, further preferably 600,000 or less, and 500,000 or less. It is particularly preferred.

  When the weight average molecular weight is less than 5,000, the viscosity index improving effect tends to be small when the lubricating oil additive composition is dissolved in the lubricating base oil. For this reason, there exists a possibility that a fuel-saving property, a low-temperature viscosity characteristic may fall, and cost may increase. On the other hand, when the weight average molecular weight exceeds 1,000,000, the shear stability of the lubricating oil additive composition, the solubility of the lubricating oil additive composition in the lubricating base oil, and the lubricating oil additive Storage stability of the composition and lubricating oil composition tends to be impaired.

  (A) PSSI (Permanent Cystability Index) of the poly (meth) acrylate compound is preferably 40 or less, more preferably 5 to 40, still more preferably 10 to 35, particularly preferably 15 to 30, and most preferably 20. ~ 25. When PSSI exceeds 40, there exists a tendency for shear stability to be impaired. On the other hand, when PSSI is less than 5, when the lubricating oil additive composition is dissolved in the lubricating base oil, an excellent viscosity index improving effect tends to be difficult to obtain. For this reason, there exists a possibility that the fuel-saving property and low-temperature viscosity characteristic of the obtained lubricating oil composition may be impaired, and cost may increase.

  In addition, “PSSI” in this specification conforms to ASTM D 6022-01 (Standard Practication for Calming of Permanent Shear Stability Index), and ASTM D 6278-02 (Test Method for Shall for Phar. Means the permanent shear stability index of the polymer, calculated based on the data measured by Diesel Injector Apparatus.

  The content of the (A) poly (meth) acrylate compound in the lubricating oil additive composition of the present embodiment is preferably 1 to 50% by mass, more preferably 5 to 45, based on the total amount of the lubricating oil additive composition. It is 10 mass%, More preferably, it is 10-40 mass%, Most preferably, it is 15-35 mass%. When the content is less than 1% by mass, in order to obtain a predetermined viscosity index improvement effect, the amount of the lubricating oil additive composition blended in the lubricating oil composition increases, and the distribution efficiency tends to be impaired. In addition, the manufacturing cost of the lubricating oil composition may increase. On the other hand, when the content exceeds 50% by mass, the handling property of the lubricating oil additive composition is impaired, and there is a tendency that good workability cannot be obtained in the manufacturing operation of the lubricating oil composition.

  The lubricating oil additive composition of this embodiment contains (B) a diluent, that is, (B) component. (B) Mineral oil, synthetic oil, and a mixture thereof are mentioned as a diluent, However, It is preferable that it is a mineral oil type diluent.

  Specifically, as mineral oil, a lubricating oil fraction obtained by distillation under reduced pressure of atmospheric residual oil obtained by atmospheric distillation of crude oil can be desolvated, solvent extracted, hydrocracked, and solvent dewaxed. , Purified by performing one or more treatments such as hydrorefining. Moreover, the lubricating base oil manufactured by the method of isomerizing the GTL WAX (gas-tree wax) manufactured by wax isomerized mineral oil, a Fischer-Tropsch process, etc. is mentioned.

  Synthetic oils include poly α-olefins or hydrides thereof, isobutene oligomers or hydrides thereof, isoparaffins, alkylbenzenes, alkylnaphthalenes, diesters (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecyl 2-ethylhexyl sebacate), polyol ester (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, dialkyldiphenyl ether, polyphenyl Examples include ether. Among these, poly α-olefin is preferable. Examples of poly α-olefins include α-olefin oligomers or co-oligomers (such as 1-octene oligomers, decene oligomers, ethylene-propylene co-oligomers) having 2 to 32 carbon atoms, preferably 6 to 16 carbon atoms, and hydrides thereof. It is done.

  (B) The diluent may be mineral oil, synthetic oil, or any mixture of two or more oils selected from these. For example, 1 or more types of mineral oil, 1 or more types of synthetic oil, the mixed oil of 1 or more types of mineral oil and 1 or more types of synthetic oil is mentioned.

Kinematic viscosity at 100 ° C. of (B) diluent is preferably 1.5 to 10 mm ² / s, more preferably 1.8~8.0mm ² / s, 2.0~6. it is particularly preferred to be 0 mm ² / s and more preferably 2.5 to 5.0 mm ² / s. (B) When the kinematic viscosity at 100 ° C. of the diluent is less than 1.5 mm ² / s, the evaporation loss of the resulting lubricating oil composition tends to increase. Moreover, when this kinematic viscosity exceeds 10 mm < ² > / s, there exists a tendency for the dissolving power with respect to (A) component to be impaired.

(B) it is preferred that the% C _A of the diluent is 3 or less, more preferably 2.5 or less, further preferably 2.0 or less, and particularly preferably 1.5 or less . (B) exceeds% C _A is 3 diluents tend to heat and oxidation stability of a lubricating oil additive composition may be impaired. Incidentally, (B)% _{C A} diluent may be zero.

“% C _A ” in the present specification means the ratio (percentage) of the aromatic carbon number to the total carbon number, which is determined by a method (ndM ring analysis) based on ASTM D 3238-85.

  (B) The sulfur content of the diluent is preferably 0.05% by mass or less, more preferably 0.04% by mass, further preferably 0.03% by mass or less, and It is particularly preferable that the content be 02% by mass or less. (B) When the sulfur content of the diluent exceeds 0.05% by mass, the heat / oxidation stability of the lubricating oil additive composition tends to be impaired.

  Usually, the sulfur content of a mineral oil-based diluent depends on the sulfur content of the raw material. On the other hand, when a raw material that does not substantially contain sulfur such as a synthetic wax component obtained by a Fischer-Tropsch reaction or the like is used, a diluent that does not substantially contain sulfur can be obtained. In addition, when using raw materials containing sulfur such as slack wax obtained in the refining process of lubricating base oil and microwax obtained in the refined wax process, the sulfur content in the resulting mineral oil-based diluent is usually 0.01. It becomes mass% or more. In addition, the "sulfur content" in this specification means the sulfur content measured based on JISK2541-1996.

  (B) Although there is no restriction | limiting in particular about the viscosity index of a diluent, 80 or more are preferable, 100 or more are more preferable, 120 or more are further more preferable. There is no restriction | limiting in particular about the upper limit of a viscosity index, The thing of about 135-180 like a normal paraffin, slack wax, GTL wax, etc. or the isoparaffin type mineral oil which isomerized these can also be used. When the viscosity index of the diluent is less than 80, the heat / oxidation stability of the lubricating oil additive composition tends to be impaired.

  The content of the diluent (B) in the lubricating oil additive composition is preferably 1 to 98% by mass, more preferably 10 to 95% by mass, based on the total amount of the lubricating oil additive composition. More preferably, it is 20-90 mass%, and it is especially preferable that it is 30-85 mass%. When the content is less than 1% by mass, the handling property of the lubricating oil additive composition is impaired, and there is a tendency that good workability cannot be obtained in the manufacturing operation of the lubricating oil composition. Further, when the mixing ratio exceeds 98% by mass, the amount of the lubricating oil additive composition added to the lubricating oil composition is increased in order to obtain a predetermined viscosity index improving effect, and the distribution efficiency is impaired. There is a tendency for the trend and the lubricant production costs to increase.

  The lubricating oil additive composition of the present embodiment comprises (C) an organic compound having at least one bond selected from the group consisting of NH bond, OH bond, and SH bond, that is, component (C). contains.

  The lubricating oil additive composition comprises (C1) amine compound, (C2) monohydric alcohol, (C3) polyhydric alcohol, (C4) partial ester of (C3) component, (C5) It is preferable to contain at least one compound selected from (C3) component partial ethers and (C6) phenol compounds, and more preferably (C1) amine compounds and / or (C6) phenol compounds.

  (C1) Specific examples of the amine compound include methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, Tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, dioctylamine, dinonylamine, didecylamine, diundecyl Amine, didodecylamine, ditridecylamine, ditetradecylamine, dipentadecylamine, dihexadecylamine, diheptadecylamine, dioctyl Having an alkyl group having 1 to 30 carbon atoms such as decylamine, methylethylamine, methylpropylamine, methylbutylamine, ethylpropylamine, ethylbutylamine, and propylbutylamine (these alkyl groups may be linear or branched) Alkylamines; alkenylamines having 2 to 30 carbon atoms such as ethenylamine, propenylamine, butenylamine, octenylamine, and oleylamine (these alkenyl groups may be linear or branched); fats such as cyclohexylamine Cyclic amines: dioctyldiphenylamine, monooctyldiphenylamine, dinonyldiphenylamine, monononyldiphenylamine, didecyldiphenylamine, monodecyldiphenylamine and the like having 8 to 20 carbon atoms Aromatic amines having these alkyl groups (these alkyl groups may be linear or branched); methanolamine, ethanolamine, propanolamine, butanolamine, pentanolamine, hexanolamine, heptanolamine, octanolamine, C 1-30 alkanol groups such as nonanolamine, methanol ethanolamine, methanol propanolamine, methanol butanolamine, ethanolpropanolamine, ethanolbutanolamine, and propanolbutanolamine (these alkanol groups are branched even if linear) An alkylene dia having a C 1-30 alkylene group such as methylene diamine, ethylene diamine, propylene diamine, and butylene diamine. Polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine; polyamines such as undecyldiethylamine, undecyldiethanolamine, dodecyldipropanolamine, oleyldiethanolamine, oleylpropylenediamine, stearyltetraethylenepentamine; and These mixtures can be exemplified. Among these, an aromatic amine having an alkyl group having 8 to 20 carbon atoms is preferable.

  As (C2) monohydric alcohol, for example, those having 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms are used. (C2) The monohydric alcohol may be linear or branched, and may be saturated or unsaturated. 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 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 hexadecanol, linear or branched heptadecanol, linear or branched octadecanol, linear or branched nonadecanol, linear Or branched icosanol, straight Jo or branched Hen'ikosanoru, linear or branched Torikosanoru, such as straight-chain or branched tetracosanol, and mixtures thereof.

  (C3) As the polyhydric alcohol, for example, those having 2 to 10 valences, preferably 2 to 6 valences are used. Specific examples of the 2 to 10 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 thereof That.

  Examples of the partial ester of (C4) polyhydric alcohol include compounds in which a part of the hydroxyl group of the polyhydric alcohol exemplified in the description of the polyhydric alcohol is hydrocarbyl esterified.

  Specific examples of carboxylic acids used for esterification of polyhydric alcohols include hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, and hexadecanoic acid. , Saturated fatty acids such as heptadecanoic acid, octadecanoic acid, nonadecanoic acid, icosanoic acid, heicosanoic acid, docosanoic acid, tricosanoic acid, tetracosanoic acid, pentacosanoic acid, hexacosanoic acid, heptacosanoic acid, octacosanoic acid, nonacosanoic acid, triacontanoic acid; , Heptenoic acid, octenoic acid, nonenoic acid, decenoic acid, undecenoic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, octadecenoic acid, nonadecenoic acid, icosenic acid, henicosenic acid, docosenoic acid, Rikosen acid, tetracosenoic acid, pentacosenoic acid, hexacosenoic acid, heptacosenoic acid, octacosenoic acid, nonacosenoic acid, unsaturated fatty acids such as triacontene acid, and mixtures of two or more thereof. These carboxylic acids may be linear or branched.

  (C4) The partial ester of polyhydric alcohol consists of glycerin monooleate, glycerin dioleate, sorbitan monooleate, sorbitan dioleate, pentaerythritol monooleate, polyethylene glycol monooleate and polyglycerin monooleate It is preferable to contain at least one selected from the group.

  (C5) The partial ether of the polyhydric alcohol includes a compound in which a part of the hydroxyl group of the polyhydric alcohol exemplified in the description of the polyhydric alcohol is hydrocarbyl etherified, and an ether bond is formed by condensation between the polyhydric alcohols. And the like (such as sorbitan condensate).

  (C5) The partial ether of the polyhydric alcohol is at least one selected from the group consisting of 3-octadecyloxy-1,2-propanediol, 3-octadecenyloxy-1,2-propanediol, and polyethylene glycol alkyl ether. It is preferable to contain.

  (C6) Examples of phenolic compounds include alkyl groups having 4 to 20 carbon atoms such as monobutylphenol, dibutylphenol, monononylphenol, dinonylphenol, monododecylphenol, didodecylphenol, etc. (these alkyl groups may be linear or branched). Mention may be made of mono- or di-alkylphenols which may be in the form of As the (C6) phenol compound, 2,6-di-tert-butylphenol is most preferable.

  The content of the organic compound having at least one bond selected from the group consisting of (C) N—H bond, O—H bond and S—H bond in the lubricant additive composition is the total amount of the lubricant additive composition On the basis, it is preferably 0.1 to 50% by mass, more preferably 1 to 40% by mass, further preferably 3 to 30% by mass, and particularly preferably 5 to 20% by mass. preferable. When the content is less than 1% by mass, the handling property of the lubricating oil additive composition is impaired, and there is a tendency that good workability cannot be obtained in the manufacturing operation of the lubricating oil composition. On the other hand, when the content exceeds 50% by mass, the amount of the lubricating oil additive composition added to the lubricating oil composition is increased in order to obtain a predetermined viscosity index improving effect, and distribution efficiency is impaired. There is a tendency for the trend and the lubricant production costs to increase.

There is no restriction | limiting in particular about the manufacturing method of the lubricating oil additive composition of this invention, The following manufacturing methods can be illustrated.
(1) In component (C) heated to 50 to 60 ° C., component (A) was added and dissolved by stirring to prepare a premix, and this premix was heated to 50 to 60 ° C. (B ) Add to ingredients and stir and mix.
(2) A mixture of the component (B) and the component (C) is heated to, for example, 50 to 60 ° C., and the component (A) is added and dissolved by stirring.
(3) After the production of the component (A), the component (A) is heated to 50 to 60 ° C., and the components (B) and (C) are added to the heated component (A) and stirred and dissolved. To do.
(4) The component (A) is added to the component (B), and dissolved by stirring to prepare a premix. While the premix was heated to 50 to 60 ° C., the component (C) was added and stirred. Mix.

  The lubricating oil additive composition of the present embodiment thus obtained is blended with a lubricating base oil having predetermined properties so as to satisfy the target properties. Thus, a lubricating oil composition containing the lubricating oil additive composition and the lubricating base oil can be obtained. The additive composition for lubricating oil of the present embodiment functions as a viscosity index improver for various lubricating oil compositions. In addition, a lubricating oil composition in which this lubricating oil additive composition is blended is sufficiently excellent in low temperature characteristics.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  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 1-3, Comparative Examples 1-3]
In order to prepare a lubricating oil additive composition, the following raw materials were prepared.
Component (A) Polymethacrylate (non-dispersed, weight average molecular weight: 400,000, PSSI: 20)
(B) component hydrocracking mineral oil (kinematic viscosity at ^{100 ℃: 2.7mm 2 / s,} % C A: 0, sulfur content: 0.00 wt%)
(C) component C-1: alkyldiphenylamine C-2: 2,6-di-tert-butylphenol (D) component (comparative component)
D-1: Neopentyl glycol dioleate D-2: Alkylbenzene

  A lubricating oil additive composition having the composition shown in Table 1 was produced by blending the above raw materials. Specifically, in the component (B) heated to 50 to 60 ° C., the component (A) was added and dissolved by stirring to prepare a premix. And (C) component was added and stirred and mixed in the premix heated at 50-60 degreeC, and the lubricating oil additive composition was manufactured.

  The fluidity of the lubricating oil additive composition of each example and each comparative example was evaluated by the fluidity test shown below. The evaluation results are as shown in Table 1.

(Fluidity test)
(1) In a 50 mL beaker, 7 g of the lubricating oil additive composition produced as a sample was collected, and the lubricating oil additive composition was heated to 40 ° C. in a thermostatic bath.
(2) A 50 mL beaker was allowed to stand, and the liquid level (horizontal plane) of the sample was used as the reference position. Thereafter, the time required for the sample to flow 1 cm and 2 cm in the horizontal direction from the reference position after the 50 mL beaker was tilted sideways was measured.

  When the content ratio of the component (A) is substantially constant, the lubricating oil additive compositions of Examples 1 to 3 are replaced with the comparative example 1 in which the component (C) is not added and the component (C) (D). ) The fluidity was superior to the lubricating oil additive compositions of Comparative Examples 2 and 3 to which the component was added. Since the content of the component (A) in the lubricating oil additive compositions of Examples 1 to 3 is sufficiently high, an excellent viscosity index improving effect is exhibited when added to the lubricating base oil.

Claims (4)

(A) selected from the group consisting of a poly (meth) acrylate compound having a weight average molecular weight of 300,000 or more , (B) a diluent, (C) N—H bond, O—H bond, and S—H bond. An organic compound having at least one bond,
The content of the poly (meth) acrylate compound is 15 to 35% by mass, and
The content of the organic compound is 5 to 20% by mass,
The organic compound is at least one selected from the group consisting of (C1) an aromatic amine having an alkyl group having 8 to 20 carbon atoms and (C6) a mono- or di-alkylphenol having an alkyl group having 4 to 20 carbon atoms . A lubricating oil additive composition comprising a compound.   The lubricating oil additive composition of claim 1, wherein the lubricating oil additive composition is a viscosity index improver. (A) selected from the group consisting of a poly (meth) acrylate compound having a weight average molecular weight of 300,000 or more , (B) a diluent, (C) N—H bond, O—H bond, and S—H bond. An organic compound having at least one bond, and a method for producing a lubricating oil additive composition,
In the lubricating oil additive composition,
The content of the poly (meth) acrylate-based compound is 15 to 35% by mass, and the content of the organic compound is 5 to 20% by mass,
The organic compound is at least one selected from the group consisting of (C1) an aromatic amine having an alkyl group having 8 to 20 carbon atoms and (C6) a mono- or di-alkylphenol having an alkyl group having 4 to 20 carbon atoms . A method for producing a lubricating oil additive composition comprising a compound.   The manufacturing method of the lubricating oil composition which mixes lubricating base oil and the lubricating oil additive composition of Claim 1 or 2.