JP2869187B2 - Lubricating oil composition for metalworking - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lubricating oil composition for metalworking, specifically comprising a specific linear olefin and an alcohol, etc.
Particularly, the present invention relates to a lubricating oil composition having excellent cleaning properties (removability) of wear powder generated during metal working of aluminum or an alloy thereof.

BACKGROUND ART In general, when linear-α-olefin is used as a lubricant in metal working such as plastic working (rolling and drawing) and cutting and grinding, processing 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 straight-chain α-olefin, aluminum abrasion powder adheres to the rolled plate. In addition, when the aluminum foil is rolled using a linear-α-olefin, pinholes may be generated in the aluminum foil itself due to abrasion powder.

Similarly, in cutting, grinding, and the like, abrasion powder adheres to the surface of the workpiece and causes various troubles.

DISCLOSURE OF THE INVENTION Accordingly, the present inventors have found that the removability (cleanability) of abrasion powder generated when performing processing such as aluminum, steel, brass or other metals or alloys, plastic working, cutting, grinding, etc. Intensive research was conducted to develop a lubricating oil for metalworking that is good, has 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 an alcohol, glycol, polyalkylene glycol or fatty acid together with a base oil containing a linear olefin having 6 to 40 carbon atoms.

 The present invention has been completed based on such findings.

That is, the present invention relates to (a) 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. 20
For metal working by mixing one or more compounds selected from linear saturated or unsaturated aliphatic alcohols (excluding lauryl alcohol), glycols, polyalkylene glycols, polyalkylene glycol derivatives and fatty acids A lubricating oil composition is provided.

The present invention also provides a lubricating oil composition for metalworking, which is obtained by blending (c) at least one compound of a phenolic compound and an amine compound with the base oil (a).

BEST MODE FOR CARRYING OUT THE INVENTION In the composition of the present invention, the linear olefin constituting the base oil of the component (a) has 6 to 40 carbon atoms as described above. 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 because they are difficult to mix and dissolve 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 linear olefins, compounds having one double bond in the molecule and having 6 to 30 carbon atoms are preferable,
In particular, an α-olefin having 12 to 30 carbon atoms (that is, n-α-
Olefins) are optimal.

Specific examples of these linear olefins include 1-octene, 1-decene, 1-dodecene, 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.

Incidentally, in the present invention, the above-mentioned linear 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. The mineral oil or synthetic oil blended here usually has a kinematic viscosity at 40 ° C of 0.5 to 500 cS.
t, in particular, one having 0.5 to 30 cSt is suitably used. Among them, various types of mineral oils can be used. For example, paraffin-based crude oil, intermediate-based crude oil or naphthenic-based crude oil is distilled under normal pressure, or the residual oil obtained by distillation under normal pressure is distilled under reduced pressure. 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.

Further, as the synthetic oil, olefins other than the above-mentioned linear olefins (for example, branched olefins such as polybutene and polypropylene), hydrides of the olefins, and the like can be used. In particular, low molecular weight polybutene, low molecular weight polypropylene, and α-olefin oligomers having 8 to 14 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 linear olefin as the base oil of the component (a), the mixing ratio is not particularly limited, but the linear olefin is usually 3% by weight or more.
Preferably, it is 5 to 60% by weight, and mineral oil and / or synthetic oil is 97% by weight or less, preferably 95 to 40% by weight.

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 4 to 40 carbon atoms, a linear saturated or unsaturated aliphatic alcohol having 6 to 20 carbon atoms (excluding lauryl alcohol), glycol, polyalkylene One of glycol, polyalkylene glycol derivative, and fatty acid is used alone or in combination of two or more.

As the alcohol, there are various types, and aliphatic alcohols are preferable, and among them, 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 A linear saturated or unsaturated aliphatic alcohol having 8 to 18 carbon atoms (excluding lauryl alcohol) is more preferred. 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 linear alcohol having more than 20 carbon atoms may not be dissolved in the base oil as the component (a),
May not be preferred.

Specific examples of such alcohols include octyl (2-ethylhexyl) alcohol, decyl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, eicosyl alcohol, oleyl alcohol, isostearyl alcohol, oxo alcohol and the like. The mixing ratio of this is not particularly limited, but is usually 0.05 to 50% by weight, preferably 0.1 to 20% by weight of the whole composition.

Next, various glycols can be used, but generally glycols having 2 to 6 carbon atoms, such as ethylene glycol; propylene glycol; trimethylene glycol; 1,4-butanediol; Can be given. The blending ratio of this
Usually, it is 0.05 to 50% by weight, preferably 0.1 to 20% by weight of the whole composition, like the above alcohol. There are various types of polyalkylene glycols and derivatives thereof, and the general formula (I) R ¹ —O (R ² —O) _n —R ³ (I) wherein R ¹ and R ³ Is hydrogen or carbon number 1
It represents an alkyl group of 20, an alkyl-substituted phenyl group or phenyl group having 7 to 24 carbon atoms, R ² represents an ethylene group, a propylene group or butylene moto, and n represents an integer of 2 to 50. ] The compound represented by these is suitable. Specifically, poly (n
= 6) ethylene glycol-monobutyl ether; poly (n = 5) propylene glycol-monononyl ether; poly (n = 10) ethylene glycol-dipropyl ether, and the like. Glycerin derivatives of polyethylene glycol and fatty acid esters of polyethylene glycol other than the compounds of the above general formula (I) can be used in the same manner. The mixing ratio of these components is usually 0.05 to 50% by weight, preferably 0.1 to 20% by weight of the whole composition, similarly to the alcohol.

Further, as the fatty acid, a linear or branched saturated or unsaturated fatty acid having usually 6 to 40 (preferably 8 to 20) carbon atoms can be used. Where the carbon number is 6
If it is less than the above, it will be greatly consumed by evaporation and scattering when used, and if it has more than 40 carbon atoms, it may not be dissolved in the base oil as the component (a). Specific examples of such fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachiic acid, behenic acid, isostearic acid, undecylenic acid, oleic acid, linoleic acid, linolenic acid, and arachidone. Acids and the like are preferred. Further, the compounding ratio of this is usually 0.05 to 1.0% by weight of the whole composition. If the proportion of the fatty acid exceeds 1.0% by weight, the annealing property is undesirably reduced.

The composition of the present invention comprises the above components (a) and (b). Instead of the component (b), or together with the components (a) and (b), the composition (c) And at least one compound of a phenolic compound and an amine compound.

Here, various compounds can be used as the phenolic compound, and usually, the compound represented by the general formula (II) or (III) [Wherein, R ⁴ and R ⁵ each represent an alkyl group having 1 to 8 carbon atoms, and R ⁶ and R ⁷ each represent hydrogen or an alkyl group having 1 to 6 carbon atoms. ] Are represented. Specifically, 2,6-di-t
ert-butyl-4-methylphenol (DBPC); 2,6-di-tert-butyl-4-ethylphenol; 2,2'-methylenebis (4-methyl-6-tert-butylphenol);
2,2 'methylenebis (4-ethyl-6-tert-butylphenol) and the like are preferred.

On the other hand, various amine compounds can be mentioned, and usually, the amine compound is represented by the general formula (IV) or (V) [Wherein, R ⁸ and R ¹¹ are each hydrogen or C 1 -C 1
0 represents an alkyl group, and R ⁹ and R ¹⁰ each have 1 to 1 carbon atoms
And R ¹² and R ¹⁴ each represent hydrogen or an alkyl group having 1 to 20 carbon atoms. ]. Specifically, di-p-octyldiphenylamine, di-p-butyldiphenylamine, di-p-dinonylphenylamine and the like, and furthermore, phenyl-α-naphthylamine, phenyl-β-naphthylamine and the like are preferable. it can.

The compounding ratio of the component (c) is preferably at least 0.1% by weight of the whole composition, and most preferably in the range of 0.1 to 2.0% by weight.

The composition of the present invention may further contain a known oily agent, an extreme pressure agent, a rust inhibitor, a corrosion inhibitor, an antifoaming agent, or the like in an appropriate amount, if desired.

〔Example〕

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Examples 1 to 12 and Comparative Examples 1 to 3 The following rolling experiments were performed using rolling lubricants having the specifications shown in Table 1.

Rolling test (rolling of aluminum plate) Aluminum plate of JIS A 5052 H16 (rolling 1.
2mm, plate width 60mm, coil) were prepared and rolled using a 4-roll rolling mill with a work roll diameter of 135mm at a rolling speed of 100m / min. With a forward tension of 170kgf and a forward tension of 400kgf using lubricating oil for each rolling. Was done. The rolling method is to reduce the rolling reduction step by step every 20m from 50.0 to 54.2 to 58.3 to 60.8 to 63.3 to 6
Rolling method using 5.8 → 68.3 (%) is adopted, and the thickness of the reduction machine (that is, during 7 passes) is 0.38 mm (68.3% compression ratio)
For each of the samples, the rolling force was measured, and the abrasion powder detergency, annealing property and rolling force were evaluated by the following methods.

(A) Abrasive powder cleaning property evaluation method (table 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 evaluation method The rolled aluminum plate was cut into a short piece having a length of 10 cm, tens of sheets were stacked, fixed with a thick steel plate, and annealed in a small annealing furnace.

The heating conditions of the blunt furnace were as follows: heating was performed in an air atmosphere at a heating rate of 5 ° C./minute to 330 ° C., and after 30 minutes, the solution was 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.

Examples 13 and 14 and Comparative Examples 4 and 5 The following cutting experiments were performed using cutting lubricants having the specifications shown in Table 2.

Cutting experiment (cutting of cylinder end face) A cylindrical aluminum alloy (AC-4A-T6) with a diameter of 80 mm was prepared as a material for cutting, and this was cut using a cutting tool (carbide 20) with t (cut) of 1 mm, Under the cutting conditions of f (feed) of 0.1 mm / rotation, the cylindrical end face of the aluminum alloy was cut.

After cutting, the surface roughness (R _max ) of the cut end face was measured and the surface was observed. The results are shown in Table 2.

Examples 2, 7 and 10 in Table 1 and Examples 13 and 14 in Table 2 are reference examples (reference examples).

INDUSTRIAL APPLICABILITY As described above, when the lubricating oil composition of the present invention is used, metal working (rolling, drawing, punching, drawing, cold forging, and other plastic working, cutting, and grinding) of various metals and their alloys is possible. In addition to improving the cleaning properties of the wear powder during processing and the like, the annealing property of the processed material is improved.

Therefore, the lubricating oil composition of the present invention is widely and effectively used as a metalworking oil in plastic working, cutting or grinding of various metals and alloys including aluminum, aluminum alloys and aluminum foils. Is done.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10M 133/12 C10M 133/12 // C10N 30:04 40:20 (72) Inventor Toshio Saito 24, Anesaki Beach, Ichihara-shi, Chiba 4 Idemitsu Kosan Co., Ltd. (56) References JP-A-63-202697 (JP, A) JP-A-1-153794 (JP, A) JP-A-2-133495 (JP, A) JP-A-39- 262 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) C10M 105/04 C10M 129/06-129/40 C10M 133/12 C10M 169/04 C10N 30:04 C10N 40:22 C10N 40:24 WPI / L (QUESTEL)

Claims (5)

(57) [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; For metalworking comprising 20 or more compounds selected from linear saturated or unsaturated aliphatic alcohols (excluding lauryl alcohol), glycols, polyalkylene glycols, polyalkylene glycol derivatives and fatty acids Lubricating oil composition. 2. A base oil comprising a mixture of (a) a linear olefin having 6 to 40 carbon atoms and a mineral oil and / or a synthetic oil,
From branched saturated or unsaturated aliphatic alcohols having 6 to 40 carbon atoms, linear saturated or unsaturated aliphatic alcohols having 6 to 20 carbon atoms (excluding lauryl alcohol), glycols, polyalkylene glycols and fatty acids A lubricating oil composition for metalworking comprising one or more selected compounds. 3. A composition comprising (c) at least one compound selected from the group consisting of a phenolic compound and an amine compound.
Or a lubricating oil composition for metal working according to 2 above. 4. A metal working composition comprising (a) a base oil mainly composed of a linear olefin having 6 to 40 carbon atoms and (c) at least one compound of a phenol compound and an amine compound. Lubricating oil composition. 5. A base oil comprising a mixture of (a) a linear olefin having 6 to 40 carbon atoms and a mineral oil and / or a synthetic oil,
At least one of a phenolic compound and an amine compound
A lubricating oil composition for metalworking comprising a mixture of various compounds.