JP2002322487A - Lubricating oil composition for metal working - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating oil composition for metal working, good in abraded powder removability (washing-off property) high in workability for a metal or alloy such as aluminum, steel or brass to working such as plastic working, cutting working or grinding working, and enabling favorable finishing of the surface of a worked product. SOLUTION: This lubricating oil composition for metal working comprises (A) a base oil consisting mainly of a 6-40C straight-chain olefin, (B) at least one alcohol selected from (1) 6-40C branched saturated or unsaturated aliphatic alcohols and (2) 6-20C straight-chain saturated or unsaturated aliphatic alcohols and (C) at least one compound selected from alkylene glycols, alkylene glycol derivatives, polyalkylene glycols and polyalkylene glycol derivatives.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil composition for metal working, and more particularly to a lubricating oil composition containing specific linear olefins, alcohols and glycols, and particularly for processing metals such as aluminum and its alloys, steel and copper. The present invention relates to a lubricating oil composition having excellent cleaning properties (removability) and rollability of generated wear powder.

[0002]

2. Description of the Related Art Generally, when a linear olefin is used as a lubricant in metal working such as plastic working (rolling and drawing) and cutting and grinding, the working powder (wear powder) is formed on the surface of a workpiece after working. ) Adheres, and deteriorates the quality of the processed product and adversely affects the operation of the next process. For example, when an aluminum plate is rolled with a mixed oil of a straight-chain olefin, aluminum wear powder adheres to the rolled plate, and if it is annealed as it is, uneven annealing may occur. However, if a linear olefin is not mixed, surface damage called herringbone is likely to occur during rolling. In addition, when glycol is mixed without adding a linear olefin, the amount of wear powder generated during rolling is reduced, but herringbone is easily generated. For this reason, various lubricating oil compositions used at the time of metal rolling have conventionally been developed, but their performance has not always been satisfactory. Therefore, development of a lubricating oil composition for metal working which has good lubricating performance and excellent workability as a rolling oil and suppresses the generation of rolling wear powder is more strongly demanded.

[0003]

SUMMARY OF THE INVENTION Under such circumstances, the present invention aims to reduce the amount of rolling wear powder remaining on the sheet surface after rolling by suppressing the generation of wear powder during metal rolling. In addition, an object of the present invention is to provide a lubricating oil composition for metalworking, which improves the rollability of aluminum, steel, copper and other metals and their alloys, and imparts a good surface condition.

[0004]

Means for Solving the Problems The present inventors have studied the removal of abrasion powder generated during the processing of aluminum, steel, copper and other metals or alloys, such as plastic working, cutting and grinding. We have conducted intensive studies to develop lubricating oils for metalworking that have good (cleanability), excellent workability, and can finish the surface condition of the work material. As a result, they have found that the above object can be achieved by using a specific alcohol and glycol in combination with a straight chain olefin having 6 to 40 carbon atoms in the base oil.
The present invention has been completed based on such findings.

That is, the present invention relates to (A) a method comprising:
(B) a branched saturated or unsaturated aliphatic alcohol having 6 to 40 carbon atoms and a linear saturated or unsaturated aliphatic alcohol having 6 to 20 carbon atoms. A lubricating oil composition for metalworking, which comprises one or more selected alcohols and one or more compounds selected from (C) alkylene glycols, alkylene glycol derivatives, polyalkylene glycols, and polyalkylene glycol derivatives. Is what you do.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the composition of the present invention, (A)
The linear olefin constituting the base oil of the component is, as described above,
It has 6 to 40 carbon atoms. Those having less than 6 carbon atoms are not suitable because of their low flash points. Those having more than 40 carbon atoms are difficult to use because they are in a solid state, and are also unsuitable for mixing and dissolving with mineral oil, synthetic oil and other additives. Further, those having more than 40 carbon atoms are not common and are difficult to obtain. Among these straight-chain olefins, the compound has one double bond in the molecule and has 6 carbon atoms.
To 30 compounds are preferred, and α-olefins having 12 to 30 carbon atoms (i.e., n-α-olefins) are most suitable. Specific examples of these linear olefins include 1-
Hexene, 1-octene, 1-decene, 1-dodecene,
Examples thereof include 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, and mixtures thereof. As these linear olefins, those obtained by various production methods can be used. For example, ethylene oligomers obtained by polymerizing ethylene by ordinary means can be used.

In the present invention, the above-mentioned straight-chain olefin may be used alone as the base oil of the component (A), but mineral oil and / or synthetic oil may be used together therewith. Further, water can be mixed. As the mineral oil or synthetic oil to be blended here, those having a kinematic viscosity at 40 ° C. of usually 0.5 to 500 mm ² / sec, particularly 0.5 to 30 mm ² / sec are suitably used. Among these, various mineral oils can be mentioned, for example, obtained by atmospheric distillation of paraffin-based crude oil, intermediate-based crude oil or naphthenic-based crude oil, or reduced-pressure distillation of residual oil of atmospheric distillation. Examples thereof include distillate oil and refined oil obtained by refining the same according to a conventional method, such as solvent refined oil, hydrogenated refined oil, dewaxed oil, and clay treated oil. When these mineral oils are blended with the above-mentioned linear olefin, the resulting lubricating oil has improved oxidation stability.

As the synthetic oil, olefins other than the above-mentioned straight-chain olefins (for example, branched olefins such as polybutene and polypropylene) and hydrides of the olefins can be used. In particular, low molecular weight polybutene, low molecular weight polypropylene, and α-olefin oligomers having 8 to 20 carbon atoms are preferable. When these synthetic oils are blended with the above-mentioned linear olefin, the resulting lubricating oil has less odor during use, improves the working environment, and further improves the degreasing property of the processed product surface. When a mineral oil or a synthetic oil is mixed with the above-mentioned linear olefin as the base oil of the component (A), the mixing ratio is not particularly limited, but usually the linear olefin is 1% by mass or more, preferably 5 to 5% by mass. The content is 30% by mass, and the content of mineral oil and / or synthetic oil is 99% by mass or less, preferably 95 to 70% by mass. When water is used instead of mineral oil or synthetic oil, an emulsion-type lubricant in which linear olefins are dispersed in water is used, and this can be used in the present invention.

Next, as the component (B) in the composition of the present invention, as described above, a branched saturated or unsaturated aliphatic alcohol having 6 to 40 carbon atoms, and a C6 to C2
0 straight-chain saturated or unsaturated aliphatic alcohols may be used alone or in combination of two or more. Examples of the alcohol include a branched saturated or unsaturated aliphatic alcohol having 6 to 40 carbon atoms (especially 8 to 30 carbon atoms) or 6 to 20 carbon atoms (especially 8 to 1 carbon atoms).
The straight-chain saturated or unsaturated aliphatic alcohol of 8) is used. When the number of carbon atoms is less than 6, it is economically disadvantageous in that it is greatly consumed by evaporation or scattering during use. Further, a branched alcohol having more than 40 carbon atoms or a branched alcohol having 20 carbon atoms
The linear alcohol having more than the above may not be dissolved in the base oil as the component (A), and may not be preferable.

Specific examples of such alcohols include:
Lauryl alcohol, octyl alcohol, decyl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, eicosyl alcohol, oleyl alcohol, isostearyl alcohol, oxo alcohol and the like. The blending ratio of this
Although not particularly limited, it is usually 0.05 to 15% by mass or less, preferably 0.5 to 10% by mass of the whole composition. Below this, no effect is observed, and even if added more, no improvement in effect is observed.

Further, as the component (C) in the composition of the present invention, an alkylene glycol, an alkylene glycol derivative, a polyalkylene glycol,
One of a polyalkylene glycol derivative, a glycol ether and a glycol ether derivative is used alone,
Alternatively, two or more kinds are used in combination. Among the above components (C), in particular, R ¹ -O- (R ² -O) _n -R ³ (I) wherein R ¹ and R ³ are each hydrogen or It represents an alkyl group having 1 to 20 carbon atoms, an alkyl-substituted phenyl group having 7 to 24 carbon atoms or a phenyl group, and R ² represents an ethylene group, a propylene group, a butylene group or a mixture thereof. N represents an integer of 1 to 50. ] Are preferable.

Here, the alkyl group represented by R ¹ and R ³ and the alkyl-substituted phenyl group specifically include, for example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, Heptyl, octyl, nonyl, decyl, undecyl, dodecyl,
Tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, tolyl, ethylphenyl, xylyl, propylphenyl, ethylmethylphenyl, trimethylphenyl,
Butylphenyl, diethylphenyl, pentylphenyl, ethylpropylphenyl, hexylphenyl, dipropylphenyl, heptylphenyl, butylpropylphenyl, octylphenyl, dibutylphenyl, nonylphenyl, decylphenyl , Undecylphenyl group, dodecylphenyl group and the like. R ² is an alkylene group consisting of an ethylene group, a propylene group or a butylene group. In the general formula of the component (C), when n is 2 or more,
A plurality of R ² may be the same or different.

Specific examples of the component (C) include ethylene glycol, 1,3-propanediol, propylene glycol, 1,4-butanediol, 1,2-butanediol, and 2-methyl-1,3-propane. Diol,
1,5-pentanediol, neopentyl glycol,
1,6-hexanediol, 2-ethyl-2-methyl-
1,3-propanediol, 1,7-heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol,
Glycols such as 1,8-octanediol; polymers or copolymers of glycols such as diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, polyethylene glycol, polypropylene glycol and polyoxyethyleneoxypropylene glycol; diethylene glycol mono- 2
Glycol such as -ethylhexyl, lauryl alcohol propylene oxide adduct, poly (n = 6) ethylene glycol-monobutyl ether, poly (n = 5) propylene glycol-monononyl ether, poly (n = 10) ethylene glycol-dipropyl ether Monoalkyl ether and dialkyl ether, monoaryl ether, diaryl ether, monoalkyl aryl ether and dialkyl aryl ether of the polymer or copolymer; monocarboxylic acid ester and dicarboxylic acid ester of glycol or the polymer or copolymer; Examples include amides of glycol or its polymer or copolymer and monoalkylamine. The carboxylic acid referred to here has 1 to 20 carbon atoms.
Are preferably used, specifically, acetic acid, propionic acid, butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid,
Stearic acid, oleic acid and the like are exemplified. As the aliphatic monoamine referred to herein, an aliphatic monoamine having 1 to 20 carbon atoms is preferably used, and specifically, methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, Nonylamine, decylamine, laurylamine, myristylamine, palmitylamine,
Examples include stearylamine and oleylamine.
The preferred average molecular weight of the component (C) is 5,000 or less.

The content of the component (C) is arbitrary and not particularly limited, but is preferably in the range of 0.01 to 10%.
%, More preferably 0.1 to 5% by mass, even more preferably 0.2 to 5% by mass (all based on the total amount of the composition). If the content is too small, there is no effect, and if it is too large, the performance as a metal working oil may be adversely affected. As described above, the metalworking lubricating oil composition of the present invention is composed of the components (A), (B) and (C). If desired, various additives may be used as the component (D) according to the present invention. Can be appropriately added as long as the object of the invention is not hindered. here,
Examples of the additives include an antioxidant, a viscosity index improver, a rust inhibitor, a corrosion inhibitor, a defoamer, an emulsifier, an antistatic agent and the like.

[0015]

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples. Examples 1 to 6 and Comparative Examples 1 and 2 The following rolling experiments were conducted using rolling lubricants having the specifications shown in Table 1, and for each lubricant, (a) cleaning of adhered abrasion powder (tape test), (B) Annealability and (c) Herringbone generation limit reduction were compared. Rolling Experiment (Rolling of Aluminum Plate) An aluminum plate of JIS A 5052 H18 (plate thickness: 1.0 mm, plate width: 75 mm, coil) was prepared as a roll, and this was rolled using a four-high rolling mill with a work roll diameter of 135 mm. 100 m / min. , Forward tension 110kg
f, rolling was performed using each lubricating oil for rolling at a rear tension of 200 kgf. The rolling method is 20 passes per pass.
The rolling reduction is 52 → 54 → 56 → 58 → 60 step by step every m
Rolling method is adopted in which the rolling is performed in the order of → 62 → 64 → 66 → 68 → 70 (%), and the rolling force is about 0.3mm (rolling rate 70%) when rolling down (that is, at 10 passes). Was measured, and the abrasion powder cleaning property, annealing property and rolling force were evaluated by the following methods.

(A) Abrasion powder cleaning property (tape test method) A cellophane tape was adhered to the surface of the rolled aluminum plate, and adhered abrasion powder was collected. This was affixed to a white paper, and the degree of dirt due to the abrasion powder was visually determined to evaluate the cleaning property of the abrasion powder attached to the aluminum plate surface. The results are shown in Table 1. (B) Annealability The aluminum plate after rolling is cut into a short length of 10 cm,
After stacking several tens, they were fixed with thick steel plates and annealed in a small annealing furnace. The heating conditions of the annealing furnace were as follows: heating in an air atmosphere at a rate of 5 ° C./min to 330 ° C .;
Allowed to cool. After the completion of the heating, the degree of occurrence of the annealing stain on the annealed plate was visually determined to evaluate the annealing property. The results are shown in Table 1. (C) Herringbone generation limit rolling reduction In the above-mentioned rolling experiment, the rolling reduction was obtained as the rolling reduction immediately before the occurrence of herringbone.

[0017]

[Table 1]

(Note) * 1 Linear olefin: tetradecene * 2 Mineral oil: paraffinic mineral oil (kinematic viscosity at 40 ° C .; 4)
mm ² / s) * 3 DPG: dipropylene glycol * 4 TPG: tripropylene glycol * 5 PPG1: polypropylene glycol (average molecular weight; about 200) * 6 PPG2: polypropylene glycol (average molecular weight; about 1000) * 7 glycol ether 1 : Diethylene glycol mono-2-ethylhexyl * 8 Glycol ether 2: Lauryl alcohol propylene oxide adduct (average molecular weight: about 2300)

From the above results, Example 1 of the present invention
It can be seen that the lubricating oil compositions of Nos. 6 to 6 exhibited excellent effects in all of the abrasion powder cleaning properties, the annealing properties, and the suppression of herringbone generation as compared with Comparative Examples 1 and 2. On the other hand, in Comparative Examples 1 and 2, Comparative Example 2 added the component (C), so that the wear powder cleaning property and the annealing property were improved as compared with Comparative Example 1, but the rolling property (Hering (Bone generation limit reduction).

[0020]

As described above, when the lubricating oil composition of the present invention is used, rolling, drawing, punching, and the like of various metals or alloys thereof, particularly non-ferrous metals such as aluminum or aluminum alloys, etc. In addition to improved abrasion powder cleaning during plastic working such as drawing and cold forging and metal working such as metal cutting and grinding, the annealing property of the work material is improved and the occurrence of herring bone during rolling can be suppressed. .
Therefore, the lubricating oil composition of the present invention comprises aluminum,
It is widely and effectively used as a metalworking oil for plastic working, cutting or grinding of various metals and alloys including aluminum alloys and aluminum foils.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 145/26 C10M 145/26 145/36 145/36 // C10N 30:00 C10N 30:00 AZ40 : 22 40:22 40:24 40:24 AZ (72) Inventor Seiichi Shidato 24-4 Anesaki Beach, Ichihara-shi, Chiba Prefecture (72) Inventor Koichi Sawa 3-1-1 Marunouchi, Chiyoda-ku, Tokyo F-term (Reference) 4H104 BA02A BB02C BB04C BB08C BB44C CB14C LA11 LA20 PA22 PA23 PA33 PA34

Claims (2)

[Claims] 1. A base oil mainly composed of a straight chain olefin having 6 to 40 carbon atoms, (B) a branched saturated or unsaturated aliphatic alcohol having 6 to 40 carbon atoms, and 6 to 40 carbon atoms.
One or more alcohols selected from 20 linear or saturated aliphatic alcohols, and one or more compounds selected from (C) alkylene glycols, alkylene glycol derivatives, polyalkylene glycols, and polyalkylene glycol derivatives A lubricating oil composition for metalworking, comprising: 2. The component (C) is represented by the formula (I) R ¹ —O— (R ² —O) _n —R ³ (I) wherein R ¹ and R ³ are each hydrogen Alternatively, it represents an alkyl group having 1 to 20 carbon atoms, an alkyl-substituted phenyl group having 7 to 24 carbon atoms or a phenyl group. R ² represents an ethylene group, a propylene group or a butylene group;
Represents an integer of 50 to 50. When n is 2 or more, a plurality of R
² may be the same or different. The lubricating oil composition for metalworking according to claim 1, which is a compound represented by the formula: