KR20020023127A - Lubricant compositions for paper machines - Google Patents

Abstract

PURPOSE: A lubricating oil composition for a paper machine is provided which has good thermostability and simultaneously excellent corrosion resistance and wear resistance. CONSTITUTION: The lubricating oil composition for a paper machine comprises a base oil of at least one kind selected from a mineral oil, fats and oils, and a synthetic oil, (A) a phosphoric ester, (B) a phenol based antioxidant and/or an amine based antioxidant, and (C) an organic acid salt of at least one metal selected from an alkali metal, an alkaline earth metal, zinc, and lead.

Description

Lubricant composition for paper machine {LUBRICANT COMPOSITIONS FOR PAPER MACHINES}

FIELD OF THE INVENTION

The present invention relates to a paper machine lubricating oil composition, and more particularly, to a paper machine lubricating oil composition having good sludge resistance and excellent corrosion resistance and wear resistance.

Prior art

In the paper machine, there is a process of drying the paper after removing the paper. In the conventional paper machine, the drying time is relatively long and the drying temperature is low. However, in recent years, the time taken for the drying process is shortened by the improvement of the production efficiency, and as a result, the drying temperature becomes very high.

When the drying temperature is increased, the heat load on the lubricating oil is also increased. In the paper machine lubricating oil using the conventional mineral oil, heat resistance is poor, and sludge and coking are easily generated in the lubricating part. In papermaking machines, strong acidic white water is used to open paper. Since such white water tends to corrode metals, papermaking lubricants are also required to prevent corrosion of the machine by such white water.

As such, there are two major performance requirements for paper machine lubricants: heat resistance and anticorrosive properties. If a large amount of metal-based detergents and ashless dispersants are used to suppress sludge, the corrosion resistance of the paper machine may be corroded and the machine body may be corroded. And it was difficult to make them compatible.

Problems to be Solved by the Invention

An object of the present invention is to provide a paper machine lubricating oil composition having good heat resistance and excellent corrosion resistance and wear resistance.

Challenge solution

The present inventors have repeatedly studied to overcome the above problems, and as a result, by using a specific lubricating oil base oil and containing a specific compound in addition to the base oil, the lubricating oil composition having good heat resistance and excellent corrosion resistance and wear resistance is obtained. It was found that the present invention was completed to complete the present invention.

In other words, the lubricating oil composition for paper machine according to the present invention is based on at least one selected from mineral oil, fat and oil and synthetic oil,

(A) phosphate ester,

(B) phenolic antioxidant and / or amine antioxidant, and

(C) It contains at least 1 sort (s) of metal organic acid salt selected from alkali metal, alkaline earth metal, zinc, and lead.

Embodiment of the Invention

Hereinafter, the present invention will be described in detail.

In the lubricating oil composition of the present invention, at least one selected from mineral oil, fats and oils and synthetic oils is used as the base oil.

Here, the mineral oil is one kind of solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, contact dewaxing, hydrorefining, sulfuric acid washing, and clay treatment with respect to lubricating oil fraction obtained by atmospheric distillation and distillation under reduced pressure of crude oil. Or mineral oils such as paraffin-based or naphthenic-based obtained by applying a combination of two or more purification means as appropriate.

Examples of fats and oils include tallow, lard, sunflower oil, soybean oil, rapeseed oil, rice bran oil, palm oil, palm oil, palm seed oil, and hydrogenated substances thereof.

As the synthetic oil, for example, poly α-olefin (ethylene-propylene copolymer, polybutene, 1-octene oligomer, 1-decene oligomer, and hydride thereof), alkylbenzene, alkylnaphthalene, monoester ( Butyl stearate, octyllaurate), diester (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate, etc. ), Polyester (trimeric acid ester, etc.), polyol ester (trimethylolpropanecaprylate, trimethylolpropane pelaronate, pentaerythritol-2-ethylhexanoate, pentaerythritol pelaronate, etc.), polyoxyalkyl Examples include ethylene glycol, polyphenyl ether, dialkyl diphenyl ether, phosphate ester (such as tricresyl phosphate), fluorine-containing compounds (perfluoropolyether, fluorinated polyolefin, etc.), silicone oil and the like. Can be.

As base oil of the papermaking lubricating oil composition of this invention, said base oil may be used independently and may be combined 2 or more types.

Among these, as the base oil of the papermaking lubricating oil composition of the present invention, synthetic oil is preferred from the viewpoint of excellent heat resistance, and poly alpha -olefin and polyol ester are particularly preferable.

Although the base oil used by this invention does not have a restriction | limiting in particular in viscosity, It is preferable that kinematic viscosity in 40 degreeC is 30 mm <^2> / s or more, and it is more preferable that it is 50 mm <^2> / s or more from the point which is excellent in load resistance. . Moreover, it is preferable that it is 1500 mm <^2> / s or less from a viewpoint of the lubricating oil supply property to a lubrication point, and it is more preferable that it is 1000 mm <^2> / s or less.

Moreover, although content of base oil is also arbitrary in the lubricating oil composition of this invention, 80 mass% or more is preferable normally on the basis of the whole quantity of lubricating oil composition for paper machines, More preferably, it is 85 mass% or more, Most preferably, 90 mass% or more to be.

In the paper machine lubricating oil composition of the present invention, the component (A) is a phosphate ester. As phosphoric acid ester, the compound specifically represented by following formula (1) is used preferably.

(RO) ₃ -P = O

In the formula, R represents a hydrocarbon group having 1 to 24 carbon atoms. Specific examples of such hydrocarbon groups include alkyl groups having 1 to 24 carbon atoms, alkenyl groups having 2 to 24 carbon atoms, cycloalkyl groups having 5 to 7 carbon atoms, alkylcycloalkyl groups having 6 to 24 carbon atoms, and having 6 to 24 carbon atoms. An aryl group having 10, an alkylaryl group having 7 to 24 carbon atoms, an arylalkyl group having 7 to 24 carbon atoms, and the like.

Among them, from the viewpoint of more excellent wear resistance, an aryl group having 6 to 10 carbon atoms and an alkylaryl group having 7 to 24 carbon atoms are preferable, and a phenyl group, a naphthyl group and an alkylphenyl group having 7 to 18 carbon atoms are more preferable. More preferred are phenyl groups and alkylphenyl groups having 7 to 10 carbon atoms.

Specific examples of the alkylphenyl group having 7 to 10 carbon atoms include methylphenyl group (substituting position of methyl group is arbitrary), dimethylphenyl group (substituting position of methyl group is arbitrary), ethylphenyl group (ethyl group) Substitution position is arbitrary), methylethylphenyl group (substitution position of methyl group and ethyl group is arbitrary), propylphenyl group (propyl group is linear or branched, and the substitution position is arbitrary), methylpropylphenyl group (The propyl group is linear or branched, the substitution position of the methyl group and the propyl group is arbitrary), the diethylphenyl group (the substitution position of the ethyl group is arbitrary), the butylphenyl group (the butyl group is linear or branched) , The substitution position is arbitrary).

In addition, the three R's may be the same or different in the same molecule.

More preferred phosphoric acid esters as the component (A) of the present invention include triphenyl phosphate, tricresyl phosphate, monocresyl diphenyl phosphate, dicresyl monophenyl phosphate, triphenylthiophosphate, and mixtures thereof. Among these, triphenyl phosphate, tricresyl phosphate, monocresyl diphenyl phosphate, dicresyl monophenyl phosphate and mixtures thereof and the like are particularly preferable.

The content of component (A) in the lubricating oil composition for a paper machine of the present invention is arbitrary, and the upper limit is preferably 10% by mass, more preferably 7% by mass, even more preferably 5% by mass, most preferably based on the total amount of the composition. Preferably it is 2 mass%, and a lower limit is preferably 0.01 mass%, More preferably, it is 0.02 mass%, More preferably, it is 0.05 mass%, most preferably 0.1 mass% based on the whole composition. Even if content of (A) component exceeds 10 mass%, the new improvement effect of various performances according to content is not seen, and there exists a possibility that storage stability may worsen. On the other hand, when content of (A) component does not satisfy 0.01 mass%, an addition effect is not seen and there exists a possibility that the heat resistance, corrosion resistance, and abrasion resistance of the paper machine lubricating oil composition may deteriorate.

(B) component in the lubricating oil composition of this invention is a (B-1) phenolic antioxidant and / or (B-2) amine antioxidant.

(B-1) As the phenol-based antioxidant, any alkylphenol-based compound used as an antioxidant for lubricating oil can be used, and is not particularly limited, but for example, among the compounds represented by the following Chemical Formula 2 or Chemical Formula 3 One or two or more alkylphenol compounds selected are exemplified as preferred.

In the formula, R ⁴ represents an alkyl group having 1 to 4 carbon atoms, R ⁵ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R ⁶ represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, The group represented by i) or the group represented by following formula (ii) is shown.

Formula i

In the above formula, R ⁷ represents an alkylene group having 1 to 6 carbon atoms, and R ⁸ represents an alkyl group or alkenyl group having 1 to 24 carbon atoms.

Formula ii

In the above formula, R ⁹ represents an alkylene group having 1 to 6 carbon atoms, R ¹⁰ represents an alkyl group having 1 to 4 carbon atoms, and R ¹¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

Wherein R ¹² and R ¹⁶ each independently represent an alkyl group having 1 to 4 carbon atoms, R ¹³ and R ¹⁷ each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ¹⁴ and R ¹⁵ are each independently Each independently represents an alkylene group having 1 to 6 carbon atoms, and Y represents an alkylene group having 1 to 18 carbon atoms or a group represented by the following formula (iii).

Formula iii

-R ¹⁸ -SR ^19-

In the above formula, R ¹⁸ and R ¹⁹ each independently represent an alkylene group having 1 to 6 carbon atoms.

In formula (2), R ⁴ represents an alkyl group having 1 to 4 carbon atoms. Specific examples of the alkyl group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, and the like, and excellent oxidation stability. Tert-butyl groups are preferred in that respect.

In addition, R ⁵ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Specific examples of the alkyl group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, and the like, and excellent oxidation stability. Preference is given to methyl groups or tert-butyl groups.

In formula (2), R ⁶ represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a group represented by formula (i) or a group represented by formula (ii).

Specific examples of the alkyl group having 1 to 4 carbon atoms represented by R ⁶ include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group and the like. Although it can be illustrated, it is preferable that they are a methyl group or an ethyl group from the point of excellent oxidative stability.

When R ⁶ in Formula 2 is a group represented by formula (i), the alkylene group having 1 to 6 carbon atoms represented by R ⁷ in formula (i) is linear or branched, specifically, for example, Methylene group, methylmethylene group, ethylene group (dimethylene group), ethylmethylene group, propylene group (methylethylene group), trimethylene group, straight or branched butylene group, straight or branched pentylene group, straight or branched hexylene And the like.

Among them, R ⁷ is an alkylene group having 1 to 2 carbon atoms, specifically, for example, a methylene group, a methylene methylene group, an ethylene group, in that the compound represented by the formula (2) can be produced in a small reaction step. Dimethylene group) and the like.

Meanwhile, the alkyl group or alkenyl group having 1 to 24 carbon atoms represented by R ⁸ of formula (i) is linear or branched, and specifically, 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, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl Alkyl groups such as groups, isocyl groups, heicosyl groups, docosyl groups, tricosyl groups, tetracosyl groups (these alkyl groups are linear or branched); Vinyl group, propenyl group, isopropenyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tride Senyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, octadecadienyl group, nonadecenyl group, isocenyl group, henicosenyl group, docosenyl Alkenyl groups, such as a group, a tricosenyl group, a detracosenyl group, these alkenyl groups are linear or branched, and the position of a double bond is arbitrary, etc. are illustrated. Among them, R ⁸ is excellent in solubility in base oils, and is an alkyl group having 4 to 18 carbon atoms, specifically, for example, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, and undecylenate. Alkyl groups (these alkyl groups are linear or branched) are preferred, such as sil, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl and octadecyl groups, More preferred are straight chain or branched alkyl groups of 6 to 12 carbon atoms, and particularly preferred are branched alkyl groups of 6 to 12 carbon atoms.

Among the phenolic compounds represented by the formula (2), in the case where R ⁶ is a group represented by the formula (i), in the formula (i), R ⁷ is an alkylene group having 1 to 2 carbon atoms, and R ⁸ is a carbon atom 6 It is more preferable that they are a linear or branched alkyl group of 12-12, It is especially preferable that R <^7> is a C1-C2 alkylene group and R <^8> is a C6-C12 branched alkyl group in general formula (i). Do.

In the case where R ⁶ in formula (2) is a group represented by formula (ii), R ⁹ in formula (ii) represents an alkylene group having 1 to 6 carbon atoms. These alkylene groups are linear or branched, specifically, the various alkylene groups mentioned above about R <^7> are mentioned, for example. As R ⁹ , among these, the compound of formula (2) can be produced in a small reaction step, and since the raw material is easy to obtain, an alkylene group having 1 to 3 carbon atoms, specifically, for example, methylene group, methylmethylene group, Ethylene group (dimethylene group), ethylmethylene group, propylene group (methylethylene group), trimethylene group and the like are more preferable.

In addition, R ¹⁰ in formula (ii) represents an alkyl group having 1 to 4 carbon atoms. Specific examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, and the like. -Butyl group is preferred. In addition, as R ¹¹ , a hydrogen atom or an alkyl group having 1 to 4 carbon atoms as described above may be exemplified. A methyl group or a tert-butyl group is preferable in view of excellent oxidation stability.

In formula (2), as described above, R ⁶ represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a group represented by formula (i) or a group represented by formula (ii), and among these, It is preferable that it is an alkyl group, and it is more preferable that it is a methyl group and an ethyl group.

As the compound represented by the formula (2), various compounds as described above are contained, and exemplifying preferred ones thereof include compounds in the case where R ⁶ is an alkyl group having 1 to 4 carbon atoms, and 2,6-di-tert- Butyl-p-cresol, 2,6-di-tert-butyl-4-ethylphenol and the like; Compounds when R ⁶ is a group represented by the formula (i) include (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-hexyl acetate, (3-methyl-5-tert-butyl- 4-hydroxyphenyl) isohexyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-heptyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) acetate Isoheptyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-octyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isooctyl acetate, (3-methyl -5-tert-butyl-4-hydroxyphenyl) 2-ethylhexyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-nonyl acetate, (3-methyl-5-tert- Butyl-4-hydroxyphenyl) isononyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-decyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl ) Isodecyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-undecyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isodecyl acetate, (3-methyl-5-tert-butyl-4- Idroxyphenyl) n-dodecyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isododecyl acetate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionic acid n-hexyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isohexyl propionate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionic acid n-heptyl, (3- Methyl-5-tert-butyl-4-hydroxyphenyl) isoheptyl propionate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-octyl propionate, (3-methyl-5-tert-butyl 4-hydroxyphenyl) isooctyl propionate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) 2-ethylhexyl propionic acid, (3-methyl-5-tert-butyl-4-hydroxyphenyl ) N-nonyl propionate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isononyl propionate, (3-methyl-5-tert-butyl-4-hydroxyphenyl) n-decyl propionate, ( 3-methyl-5-tert-butyl-4-hydroxyphenyl) isodecyl propionic acid, (3-methyl-5-tert-butyl-4-hydroxy Hydroxyphenyl) propionic acid n-undecyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionic acid isodecyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) propionic acid n -Dodecyl, (3-methyl-5-tert-butyl-4-hydroxyphenyl) isododecyl propionic acid, (3,5-di-tert-butyl-4-hydroxyphenyl) n-hexyl acetate, (3 , 5-di-tert-butyl-4-hydroxyphenyl) isohexyl acetate, (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) n-octyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl ) Isooctyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) 2-ethylhexyl acetate, (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) n-decyl acetate, (3,5-di- tert-butyl-4-hydroxyphenyl) isoacetic acid , (3,5-di-tert-butyl-4-hydroxyphenyl) n-undecyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) isodecyl acetate, (3,5 -Di-tert-butyl-4-hydroxyphenyl) n-dodecyl acetate, (3,5-di-tert-butyl-4-hydroxyphenyl) isododecyl acetate, (3,5-di-tert- Butyl-4-hydroxyphenyl) n-hexyl propionic acid, (3,5-di-tert-butyl-4-hydroxyphenyl) isohexyl propionic acid, (3,5-di-tert-butyl-4-hydroxyphenyl ) Propionic acid n-heptyl, (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid isoheptyl, (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octyl, ( 3,5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, (3,5-di-tert-butyl-4-hydroxyphenyl) 2-ethylhexyl 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-hydroxy Oxyphenyl) pro N-decyl onion, (3,5-di-tert-butyl-4-hydroxyphenyl) isodecyl propionic acid, (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-undecyl, ( 3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid isoundecyl, (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-dodecyl, (3,5-di -tert-butyl-4-hydroxyphenyl) propionic acid isododecyl and the like; Compounds when R ⁶ is a group represented by formula (ii) include bis (3,5-di-tert-butyl-4-hydroxyphenyl) methane and 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 mixtures thereof.

In Formula 3, R ¹² and R ¹⁶ each independently represent an alkyl group having 1 to 4 carbon atoms. Specifically, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group and the like can be cited. And also tert-butyl group.

In addition, R ¹³ and R ¹⁷ each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Although the above-mentioned group is mentioned as such an alkyl group, From the point which is excellent in oxidative stability, it is preferable that they are each independently a methyl group or a tert- butyl group.

In addition, in General formula (3), the C1-C6 alkylene group which R <^14> and R <^15> represents is linear or branched form, Specifically, the various alkylene groups mentioned above with respect to R <^7> can be mentioned. Among them, R ¹⁴ and R ¹⁵ each independently represent an alkylene group having 1 to 2 carbon atoms, in that the compound represented by the formula (3) can be produced in a small reaction process and the availability of the raw materials is easy. For example, a methylene group, a methylmethylene group, an ethylene group (dimethylene group), etc. are more preferable.

In the formula (3), Y represents an alkylene group having 1 to 18 carbon atoms or a group represented by the formula (iii).

Specific examples of the alkylene group having 1 to 18 carbon atoms represented by Y include, for example, methylene group, methylmethylene group, ethylene group (dimethylene group), ethylmethylene group, propylene group (methylethylene group), trimethylene group, Butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group, undecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group And hexadecylene groups, heptadecylene groups, octadecylene groups, and the like (these alkylene groups are linear or branched), and alkylene groups having 1 to 6 carbon atoms in view of the availability of raw materials and the like. Specifically, for example, methylene group, methylmethylene group, ethylene group (dimethylene group), ethylmethylene group, propylene group (methylethylene group), trimethylene group, butylene group, pentylene , Hexylene groups and the like (these alkylene groups are linear or branched) are more preferred, and ethylene groups (dimethylene groups), trimethylene groups, straight butylene groups (tetramethylene groups), straight pentylene groups ( Particularly preferred are straight chain alkylene groups having 2 to 6 carbon atoms such as pentamethylene group) and straight hexylene group (hexamethylene group).

Among the alkylphenols represented by the general formula (3), those compounds in which Y is an alkylene group having 1 to 18 carbon atoms are particularly preferred are compounds represented by the following general formula (4).

In the case where Y in the formula (3) is a group represented by the formula (iii), the alkylene group having 1 to 6 carbon atoms represented by R ¹⁸ and R ¹⁹ in the formula (iii) is linear or branched, specifically, Each independently includes various alkylene groups as described above for R ⁷ . Among them, R ¹⁸ and R ¹⁹ are each independently an alkylene group having 1 to 3 carbon atoms, specifically, for example, methylene group, methylmethylene group, ethylene group ( More preferably, dimethylene group), ethylmethylene group, propylene group (methylethylene group), trimethylene group, or the like.

Among the alkylphenols represented by the general formula (3), those compounds in which Y is a group represented by the general formula (iii) are particularly preferred compounds represented by the following general formula (5).

On the other hand, as the amine antioxidant (B-2), any aromatic amine compound used as an antioxidant of a lubricating oil can be used, although it is not specifically limited, For example, it is represented by the following general formula (Np) -Alkyl) phenyl-α-naphthylamine or one or two or more aromatic amines selected from p, p'-dialkyldiphenylamines represented by the formula (7) are exemplified as preferred.

In the formula, R ²⁰ represents a hydrogen atom or an alkyl group having 1 to 16 carbon atoms.

In the above formula, R ²¹ and R ²² each independently represent an alkyl group having 1 to 16 carbon atoms.

In Formula 6, R ²⁰ represents a hydrogen atom or a linear or branched alkyl group having 1 to 16 carbon atoms. When carbon number of R <^20> exceeds 16, there exists a possibility that the ratio of the functional group occupying in a molecule | numerator may become small, and the antioxidant capability may become weak.

Specifically as the alkyl group of R ²⁰ , 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 , Tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group and the like (these alkyl groups are linear or branched).

Among the compounds represented by the formula (6), in the case where R ²⁰ is an alkyl group, in view of excellent solubility of its own oxidation product in the base oil, a C 8-16 branched alkyl group is preferable, and furthermore, 3 or 4 carbon atoms. More preferred are branched chain alkyl groups of 8 to 16 carbon atoms derived from oligomers of olefins. Specific examples of the olefins having 3 or 4 carbon atoms include propylene, 1-butene, 2-butene and isobutylene. In terms of excellent solubility of their own oxidation product in base oil, propylene or Isobutylene is preferred.

When (Np-alkyl) phenyl-α-naphthylamine represented by the formula (6) is used as the component (B-2) in the present invention, R ²⁰ is a side chain derived from a dimer of a hydrogen atom or isobutylene. Octyl groups, branched nonyl groups derived from trimers of propylene, branched dodecyl groups derived from trimers of isobutylene, branched dodecyl groups derived from tetramers of propylene or branched pentadecyl derived from pentamers of propylene Groups are particularly preferred, and branched octyl groups derived from hydrogen atoms or dimers of isobutylene, branched dodecyl groups derived from trimers of isobutylene or branched dodecyl groups derived from tetramers of propylene are particularly preferred. Do.

As the compound in which R ²⁰ of the aromatic amine represented by the formula (6) is an alkyl group, a commercially available one may be used as the Np-alkylphenyl-α-naphthylamine. In addition, a phenyl-α-naphthylamine, a halogenated alkyl compound having 1 to 16 carbon atoms, an olefin having 2 to 16 carbon atoms, or an olefin oligomer having 2 to 16 carbon atoms and a phenyl-α-naphthylamine using a Friedel-Crafts catalyst It can be synthesize | combined easily by making it react. As the Friedel-Crafts catalyst at this time, for example, metal halides such as aluminum chloride, zinc chloride, iron chloride; Acidic catalysts such as sulfuric acid, phosphoric acid, phosphorus pentoxide, boron fluoride, acidic clay and activated clay; Etc. can be used.

On the other hand, in the formula (7) representing p, p'-dialkyldiphenylamine, R ²¹ and R ²² each independently represent an alkyl group having 1 to 16 carbon atoms.

When one or both of R ²¹ and R ²² are hydrogen atoms, they themselves may be precipitated as sludge by oxidation, while when the carbon number exceeds 16, the proportion of functional groups in the molecule becomes small. There is a fear that the antioxidant capacity is weakened.

As R ²¹ and R ²² , specifically, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group , Tetradecyl group, pentadecyl group, hexadecyl group and the like (these alkyl groups are linear or branched). Among these, R ²¹ and R ²² are preferably C3-C16 branched alkyl groups in view of excellent solubility of their own oxidation products in base oil, and furthermore, from olefins having 3 or 4 carbon atoms or oligomers thereof. More preferred are branched alkyl groups having 3 to 16 carbon atoms derived.

Specific examples of the olefin having 3 or 4 carbon atoms include propylene, 1-butene, 2-butene, isobutylene, and the like. In view of excellent solubility in lubricating oil base oil of its own oxidation product, Propylene or isobutylene is preferred.

In the present invention, when using p, p'-dialkyldiphenylamine represented by the formula (7) as the component (B-2), R ²¹ and R ²² is derived from isopropyl group, isobutylene derived from propylene Tert-butyl group, branched chain hexyl group derived from dimer of propylene, branched chain octyl group derived from dimer of isobutylene, branched chain nonyl group derived from trimer of propylene, trimer derived from isobutylene Particular preference is given to branched dodecyl groups, branched dodecyl groups derived from tetramers of propylene or branched pentadecyl groups derived from pentamers of propylene, tert-butyl groups derived from isobutylene, dimers of propylene Side chain hexyl groups, side chain octyl groups derived from dimers of isobutylene, side chain nonyl groups derived from trimers of propylene, Particular preference is given to branched dodecyl groups derived from trimers of sobutylene or branched dodecyl groups derived from tetramers of propylene.

As p, p'- dialkyl diphenylamine represented by General formula (7), you may use a commercially available thing. Also, similarly to Np-alkylphenyl-α-naphthylamine represented by the formula (6), diphenylamine and a halogenated alkyl compound having 1 to 16 carbon atoms, olefins having 2 to 16 carbon atoms, or olefins having 2 to 16 carbon atoms or these The oligomer and diphenylamine can be easily synthesized by reacting with a Friedel-Crafts catalyst. As the Friedel-Crafts catalyst at this time, for example, metal halides and acidic catalysts as listed in the case of N-p-alkylphenyl-α-naphthylamine synthesis are used.

Naturally, as the component (B) of the present invention, one compound selected from a phenolic antioxidant and an amine antioxidant may be used alone, and further, an arbitrary mixing ratio mixture of two or more compounds selected from the above. Etc. may be used.

The content of component (B) in the lubricating oil composition of the present invention is arbitrary, and the upper limit thereof is preferably 10% by mass, more preferably 7% by mass, even more preferably 5% by mass, most preferably based on the total amount of the composition. Is 2 mass%. Even if the content exceeds 10% by mass, there is no new improvement effect of wear resistance in accordance with the content, and there is a fear that the storage stability deteriorates.

On the other hand, the lower limit of the content of the component (B) is preferably 0.01% by mass, more preferably 0.02% by mass, still more preferably 0.05% by mass, and most preferably 0.1% by mass, based on the total amount of the composition. When content of (B) component does not satisfy 0.01 mass%, the addition effect is not seen and there exists a possibility that the heat resistance and abrasion resistance of a lubricating oil composition may deteriorate.

Component (C) of the present invention is an organic acid salt of at least one metal selected from alkali metals, alkaline earth metals, zinc and lead.

In the above (C) component, for example, sodium and potassium, and alkali earth metals, for example, magnesium, calcium and barium, etc., in the present invention, alkali earth metals are preferable. Used.

Further, in the component (C), examples of the organic acid salt include (B-1) sulfonate, (C-2) phenate, (C-3) salicylate, and mixtures thereof.

As the sulfonate (C-1), an alkyl aromatic sulfonic acid obtained by sulfonating an alkyl aromatic compound having a molecular weight of 100 to 1500, preferably 200 to 700, and an alkali metal, alkaline earth metal, zinc or lead base (oxide and Hydroxides), so-called neutral sulfonates; So-called basic sulfonates obtained by heating neutral sulfonates and salts and bases (oxides and hydroxides) of excess alkali metal, alkaline earth metal, zinc or lead in the presence of water; So-called carbonate overbased (superbasic) sulfonates, obtained by reacting a neutral sulfonate with an alkali metal, alkaline earth metal, zinc or lead base (oxides and hydroxides) in the presence of carbon dioxide gas; The neutral sulfonate is reacted with an alkali metal, an alkaline earth metal, a base of zinc or lead (oxides and hydroxides) and a boric acid compound such as boric acid or boric anhydride, or a carbonate overbased (superbasic) sulfonate and boric acid or boric anhydride So-called borate overbasic (superbasic) sulfonates prepared by reacting boric acid compounds; And mixtures thereof.

Specific examples of the alkyl aromatic sulfonic acid include so-called petroleum sulfonic acid and synthetic sulfonic acid. As petroleum sulfonic acid here, generally the sulfonated alkyl aromatic compound of the lubricating oil component of mineral oil, what is called mahogany acid etc. which by-produce at the time of white oil manufacture are used. As the synthetic sulfonic acid, for example, sulfonated alkylbenzenes having linear or branched alkyl groups, which are by-produced from an alkylbenzene production plant serving as a raw material for detergents or obtained by alkylating polyolefins with benzene, Or sulfonated alkylnaphthalene such as dinonyl naphthalene or the like is used. The sulfonating agent in the case of sulfonating these alkyl aromatic compounds is not particularly limited, but fuming sulfuric acid and sulfuric anhydride are usually used.

(C-2) As the phenate, for example, an alkyl phenol having 1 to 2 alkyl groups having 4 to 20 carbon atoms and a base (oxide and hydroxide) of an alkali metal, an alkaline earth metal, zinc or lead in the presence of elemental sulfur Or neutral phenates obtained by reaction in the absence; So-called basic phenates which are obtained by heating salts and bases (oxides and hydroxides) of neutral phenates and excess alkali metals, alkaline earth metals, zinc or lead in the presence of water; So-called carbonate overbased (superbasic) phenates obtained by reacting neutral phenates with alkali metals, alkaline earth metals, zinc or lead bases (oxides and hydroxides) in the presence of carbon dioxide gas; The neutral phenate is reacted with an alkali metal, an alkaline earth metal, a base of zinc or lead (oxides and hydroxides) and a boric acid compound such as boric acid or boric anhydride, or carbonate overbased (superbasic) phenate and boric acid or boric anhydride So-called borate overbasic (superbasic) phenates prepared by reacting boric acid compounds; And mixtures thereof.

As (C-3) salicylate, for example, an alkyl salicylic acid having 1 to 2 alkyl groups having 4 to 20 carbon atoms may be an alkali metal, alkaline earth metal, zinc or lead base (oxide) in the presence or absence of elemental sulfur. Neutral hydroxide) obtained by reacting with; So-called basic salicylates obtained by heating salts and bases (oxides and hydroxides) of neutral salicylate and excess alkali metal, alkaline earth metal, zinc or lead in the presence of water; So-called carbonate overbased (superbasic) salicylates obtained by reacting neutral salicylates with alkali metals, alkaline earth metals, zinc or lead bases (oxides and hydroxides) in the presence of carbon dioxide gas; The neutral salicylate is reacted with an alkali metal, an alkaline earth metal, a base of zinc or lead (oxides and hydroxides) and a boric acid compound such as boric acid or boric anhydride, or a carbonate overbased (superbasic) metal salicylate with boric acid or So-called borate overbasic (superbasic) salicylates prepared by reacting boric acid compounds such as boric anhydride; And mixtures thereof.

Although the total base value of (C) component of this invention is arbitrary, as for (C) component, all base values are preferably 0-500 mg KOH / g, More preferably, 0-450 mg KOH / g is used. do. In other words, the total base value as used in the present invention means the total base value by the hydrochloric acid method measured in accordance with JIS K 2501-1992 "Petroleum products and Lubricant-neutralization test method".

In the present invention, as the component (C), only one kind selected from the above compounds may be used, or a mixture of two or more kinds may be used.

The content of component (C) in the papermaking lubricating oil composition of the present invention is arbitrary, but the upper limit thereof is preferably 20% by mass, more preferably 10% by mass, still more preferably 5% by mass, based on the total amount of the composition. Preferably it is 3 mass%, On the other hand, the lower limit is 0.01 mass%, More preferably, it is 0.05 mass%, More preferably, it is 0.1 mass%, Most preferably 0.2 mass% based on the whole composition. Even if content of (C) component exceeds 20 mass%, the new improvement effect of various performances according to content is not seen, and there exists a possibility that storage stability may worsen. On the other hand, when content of (C) component does not satisfy 0.01 mass%, the addition effect is not seen and there exists a possibility that the heat resistance of the lubricating oil composition for paper machines may deteriorate.

In the present invention, as described above, by using a specific base oil as the base oil, by containing the (A) component, (B) component and (C) component as essential components, for paper machine further improved heat resistance, corrosion resistance and wear resistance A lubricating oil composition can be obtained.

The paper machine lubricating oil composition of the present invention is further used in a form in which various other additives are blended, in order to enhance the excellent properties thereof as necessary.

Such additives include oil improving agents such as oleic acid and fats and oils, anti-aging agents such as polysulfite, sulfide olefins and sulfide esters, metal deactivators such as benzotriazole and alkylthiadiazole; Antifoaming agents such as silicone oil, fluorosilicone oil and polyacrylate; Anti-emulsifiers such as condensation products of ethylene oxide and propylene oxide; Pour point lowering agents, such as polymethacrylate; Viscosity index improvers such as polymethacrylate, polybutene, polyalkylstyrene, olefin copolymer, styrene-diene copolymer, styrene-maleic anhydride copolymer; Rust inhibitors;

When mix | blending these additives with the papermaking lubricating oil composition of this invention, you may use individually, respectively and may use it in combination of 2 or more types. Although the addition amount at the time of mix | blending these well-known additives is arbitrary, It is preferable to add the quantity which the total amount of these well-known additives normally will be 15 mass% or less on the basis of a composition whole quantity.

The lubricating oil composition of the present invention is used for papermaking machines, but the lubricating oil composition is applicable to other uses other than papermaking machines, for example, as lubricating oils for gears, bearings, compressors, hydraulic pressure, etc. of various machines.

Example

Hereinafter, the content of the present invention will be described in more detail with reference to Examples and Comparative Examples, and the present invention is not limited to these Examples.

Example 1-5 and Comparative Example 1-7

The lubricating oil composition for paper machine which concerns on this invention was prepared with the composition shown in Table 1 (Example 1-5). In addition, a comparative composition was prepared with the composition shown in Table 2 (Comparative Example 1-7).

Incidentally, each component used in Examples and Comparative Examples is as follows.

Base oil

Group 1: ester of dipentaerythritol with branched C _8-10 fatty acid

(Kinematic viscosity 150 mm ² / s @ 40 ° C)

Group 2: 1-decene oligomer (number average molecular weight 1650)

(A) component

A 1: Tricresyl Phosphate

A 2: diphenyl monocresyl phosphate

(B) component

B 1: 2,6-di-tert-butyl-p-cresol

B 2: p, p'-di-branched octyldiphenylamine

(C) component

C 1: Calcium Carbonate Overbased Calcium Salicylate

(All basic value (hydrochloric acid method) 160 mg KOH / g)

C 2: neutral calcium sulfonate (full base value (hydrochloric acid method) 0 mg KOH / g)

About the composition of these Examples and the comparative example, the heat resistance, corrosion resistance, and abrasion resistance were evaluated by the test method shown below. The results are shown in Table 1 and Table 2.

Thermal Stability: Thermal Stability Test

In accordance with the "Lubrication oil thermal stability test method" specified in JIS K 2540, 45 g of sample oil was collected in a 50 ml beaker, a copper and iron catalyst was placed therein, and left in an air constant temperature layer at 160 ° C for 10 days. And the amount of sludge in the sample oil was measured.

Incidentally, for the copper and iron catalysts, those obtained by winding 8 times (about 3.5 cm in length) the catalyst used for the turbine oil oxidation stability test (JIS K 2514) were used.

Anticorrosive: Antirust Test

The rust prevention test was performed by the test method which was prescribed | regulated by JISK2510 "Lubrication antirust performance test method" by the test method improved for the corrosion resistance evaluation of the paper machine lubricant.

The change point used distilled water or artificial seawater when evaluating normal lubricating oil, but artificial white water was used instead of these when evaluating paper machine lubricating oil.

Abrasion Resistance: FALEX Abrasion Test

The FALEX wear test was performed using a test machine specified in ASTM D 3233-93 "Standard Test Methods for Measurement of Extream Pressure Properties of Fluid Lubricants (Falex Pin Vee Block Methods)".

Incidentally, the pin (journal) used a force of 6.35 mm (1/4 inch) in outer diameter and 31.75 mm (1 and 1/4 inch) in length, and a force of 96 degrees for the V-shaped block.

Test conditions were performed at a rotation speed of 1000 rpm, Direct Load 100 lbs, and a test time of 16 hours.

Composition [mass%] Thermal stability sludge amount [mg / 45 g] Anticorrosive Wear [mg] Base oil (A) component (B) component (C) component Example One Period 1 [98.8] A 1 [0.5] B 1 [0.5] C 1 [0.2] 5.6 No rust 4.4 2 2 [98.8] A 1 [0.5] B 1 [0.5] C 1 [0.2] 4.7 No rust 3.7 3 Period 1 [98.8] A 2 [0.5] B 1 [0.5] C 1 [0.2] 3.7 No rust 7.0 4 Period 1 [98.8] A 1 [0.5] B 2 [0.5] C 1 [0.2] 6.8 No rust 4.1 5 Period 1 [98.8] A 1 [0.5] B 1 [0.5] C 2 [0.2] 7.4 No rust 7.5

Composition [mass%] Thermal stability sludge amount [mg / 45 g] Anticorrosive Wear [mg] Base oil (A) component (B) component (C) component Comparative example One Period 1 [99.0] A 1 [0.5] B 1 [0.5] - 41.7 Rust (severe) 17.9 2 Flag 1 [99.3] - B 1 [0.5] C 1 [0.2] 52.9 Rust (medium) 13.4 3 Flag 1 [99.3] A 1 [0.5] - C 1 [0.2] 74.1 Rust (severe) 32.9 4 Flag 1 [100] - - - 229.4 Rust (Minor) 52.9 5 Flag 1 [99.8] - - C 1 [0.2] 147.2 Rust (severe) 68.0 6 Flag 1 [99.5] - B 1 [0.5] - 86.3 Rust (severe) 19.8 7 Flag 1 [99.5] A 1 [0.5] - - 73.9 Rust (severe) 57.3

From Table 1 and Table 2, it is understood that the papermaking lubricant composition (Examples 1-5) of the present invention combines good performance with excellent heat resistance, corrosion resistance and abrasion resistance as compared with the composition of Comparative Example 1-7.

Since the lubricating oil composition for paper machine of the present invention is excellent in heat resistance, it suppresses sludge generation in the lubricating oil pipe, and is excellent in corrosion resistance and wear resistance, and thus is a lubricating oil composition which leads to a long service life of the machine.

Claims (1)

Based on at least one selected from mineral oils, fats and oils, synthetic oils, (A) phosphate ester, (B) phenolic antioxidant and / or amine antioxidant, and (C) A lubricating oil composition for paper machine comprising at least one metal organic acid salt selected from alkali metals, alkaline earth metals, zinc and lead.