KR970010855B1 - Lubricant composition for metal working - Google Patents

Abstract

None.

Description

Lubricant Compositions for Metal Processing

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating composition for metalworking, in particular containing certain straight chain olefins, alcohols, and the like, and in particular, cleaning property (abrasion) of abrasive dust generated during metal processing of aluminum or its alloys. This excellent lubricating oil composition is related.

Generally, straight-chain-α-olefin is used as a lubricant in metal processing such as lawsuit processing (rolling or drawing), cutting and grinding processing, but after processing, the processed powder (abrasive powder) adheres to the surface of the workpiece. This will adversely affect the stock out of stock and the work of the next process.

For example, when the aluminum sheet is rolled with a straight chain-α-olefin, the aluminum abrasive powder adheres to the rolled sheet, and when it is annealed as it is, annealing unevenness becomes remarkable. In addition, when the aluminum thin film is rolled using a straight chain-α-olepepine, there is a fear that pinholes are generated in the aluminum thin film itself by the abrasive powder.

Similarly, in cutting and grinding processing, the abrasive powder adheres to the surface of the workpiece, causing various difficulties.

Therefore, the inventors of the present invention are good in the removal (cleaning) of the abrasive powder generated when processing aluminum, copper, brass, other metals or alloys, such as plastic working, cutting, grinding, etc., and excellent in workability. Intensive research was carried out to develop a lubricant for metalworking which can finish the surface condition of the metal well.

As a result, it has been found that the above object can be achieved by using alcohol, glycol, polyalkylene glycol or fatty acid together with base oil containing straight chain olefins having 6 to 40 carbon atoms.

The present invention has been completed based on these findings.

That is, the present invention is a metal comprising (a) a base oil mainly composed of straight chain olefins having 6 to 40 carbon atoms, and (b) at least one compound of an alcohol, glycol, polyalkylene glycol, polyalkylene glycol derivative, and fatty acid. It is to provide a lubricating oil composition for processing.

Moreover, this invention also provides the lubricating oil composition for metal processing which mix | blended at least 1 sort (s) of the compound (c) phenol type compound and an amine compound with said (a) base oil.

In the composition of the present invention, the straight chain olefin constituting the base oil of component (a) has 6 to 40 carbon atoms as described above.

Carbons less than 6 are not suitable because of their low flash point.

Moreover, since carbon number exceeding 40 becomes a solid form, it is difficult to use, and also it is difficult to mix and melt | dissolve with mineral oil, synthetic oil, another additive, etc., and is inappropriate.

In addition, carbon number exceeding 40 is not uncommon and is difficult to obtain. Among these straight chain olefins, compounds having 6 to 30 carbon atoms having one double bond in the molecule are preferred, and α-olefins having 12 to 30 carbon atoms (ie, n-α-olefins) are most suitable.

Specific examples of these straight chain olefins include 1-oxene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-icocene or mixtures thereof.

Although these straight chain olefins can use what is obtained by various manufacturing methods, For example, the ethylene oligomer obtained by superposing | polymerizing ethylene by a conventional method can be used.

Incidentally, in the present invention, straight chain olefins may be used alone as the base oil of component (a), but mineral oils and / or synthetic oils may be used with this.

Alternatively, water may be mixed. Here, as the mineral oil or the synthetic oil to be blended, a kinematic viscosity at 40 ° C. is usually 0.5-500 cSt, particularly preferably 0.5-30 cSt.

Examples of the dual mineral oil include, but are not limited to, for example, distilled oil obtained by atmospheric distillation of paraffinic crude oil, intermediate machinery crude oil or naprene machinery crude oil, or distillation under reduced pressure of residual oil of atmospheric distillation, or according to a general method. Refined oils obtained by refining, for example, solvent refined oils, hydrorefined oils, dewaxed oils, clay treated oils and the like can be given. When these mineral oils are blended with straight chain olefins, the lubricating oils obtained improve oxidation stability.

As the synthetic oil, olefins other than straight chain olefins (eg, chain olefins such as polybutene, polypropylene, etc.), and hydrides of these olefins can be used. In particular, low molecular weight polybutes, low molecular weight polypropylenes or α-olefin oligomers having 8 to 14 carbon atoms are preferable.

When these synthetic oils are blended with the straight chain olefins, the lubricating oil obtained produces less odor during use, improves the working environment, and improves the degreasing property of the surface of the processed product.

When the mineral oil or the synthetic oil is mixed with the straight chain olefin as the base oil of the component (a), the mixing ratio is not particularly limited, but the straight chain olefin is usually 3% by weight or more, preferably 5-60% by weight. The mineral oil and / or the synthetic oil is 97% by weight or less, preferably 95-40% by weight.

In addition, mineral oil is used as an lubricating oil of an emulsion type in which water is used instead of synthetic oil and a straight chain olefin is dispersed in water, which may be used in the present invention.

In addition, as (b) component in the composition of this invention, 1 type is used individually or in combination of 2 or more types among alcohol, glycol, polyalkylene glycol, polyalkylene glycol derivative, and fatty acid as mentioned above.

Here, although there are various alcohols, aliphatic alcohols are preferable, and among them, side-chain saturated or unsaturated aliphatic alcohols having 6 to 40 carbon atoms (especially 8 to 30 carbon atoms) or 6 to 20 carbon atoms (especially 8 to 18 carbon atoms) More preferred are straight chain saturated or unsaturated aliphatic alcohols.

If the carbon number is less than 6, it is economically disadvantageous because it is consumed by evaporation or scattering at the time of use. In addition, the side chain alcohol having more than 40 carbon atoms and the straight chain alcohol having more than 20 carbon atoms may not be dissolved in the base oil of component (a).

Specific examples of such alcohols include octyl (2-ethylhexyl) alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, icosyl alcohol, oleyl alcohol, isostearyl alcohol, oxo alcohol, and the like. Can be mentioned.

The blending ratio thereof is not particularly limited but is usually 0.05-50% by weight, preferably 0.1-20% by weight of the total composition.

In addition, although various things can be used also about glycol, C2-C6 glycol, for example, ethylene glycol, propylene glycol, trimethylene glycol, 1.4-butanediol, 1.5-pentanediol, etc. are mentioned.

Its compounding ratio is usually 0.05-50% by weight, preferably 0.1-20% by weight of the whole composition as in the above alcohol. Moreover, although there are many kinds of polyamylene glycol and its derivative (s), General formula (I)

R ¹ -O (R ² -O) nR ³ ... (I)

[Wherein, R ¹ and R ³ each represent hydrogen or an alkyl group having 1-20 carbon atoms, an alkyl substituted phenyl group having 7-24 carbon atoms or a phenyl group, R ² represents an ethylene group, a propylene group or a butylene group, and n represents 2 Represents an integer of -50].

Specific examples thereof include poly (n = 6) ethylene glycol monobutyl ether, poly (n = 5) propylene glycol monomonyl ether, and poly (n = 10) ethylene glycol dipropyl ether.

Glycerine derivatives of polyethylene glycol and fatty acid esters of polyethylene glycol other than the compound of the general formula (I) can also be used in the same manner. These blending ratios are usually 0.05-50% by weight, preferably 0.1-20% by weight of the whole composition as in the alcohol.

As for the fatty acid, there are usually straight or side chain saturated fatty acids or unsaturated fatty acids having 6 to 40 carbon atoms (preferably having 8 to 20 carbon atoms).

Here, when the carbon number is less than 6, the consumption by evaporation and scattering is large and the carbon number exceeding 40 may not melt | dissolve in base oil which is (a) component.

Specific examples of such fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, isostearic acid, undecylenic acid, oleic acid, linolesa, linoleic acid , Arachidonic acid etc. are mentioned as a suitable thing.

Moreover, the compounding ratio of this is 0.05-1.0 weight% of the whole composition normally.

If the blending ratio of this fatty acid exceeds 1.0% by weight, the annealing property is lowered, which is not preferable.

Although the composition of this invention consists of said (a) component and (b) component, in the phenolic compound and amine compound which are (c) component instead of this (b) component or with (a) and (b) component, You may mix | blend at least 1 sort (s) of compound.

Here, various kinds of phenolic compounds can be used, but in general formula (II) or (III)

In the formula, 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.

Specifically, 2.6-di-t-butyl-4-methylphenol (DBPC), 2.6-di-t-butyl-4-ethylphenol, 2.2'-methylenebis (4-methyl-6-t-butylphenol), 2.2'-methylenebis (4-ethyl-6-t-butylphenol) etc. are suitable.

On the other hand, there are a variety of amine compounds, but in general formula (IV) or (V)

[Commercially, R ⁸ and R ¹¹ each represent hydrogen or an alkyl group having 1-10 carbon atoms, R ⁹ and R ¹⁰ each represent an alkyl group having 1-20 carbon atoms, and R ¹² -R ¹⁴ are each hydrogen or 1-20 carbon atoms. It represents an alkyl group of.].

Specifically, di-p-octyl to phenylamine, di-p-butyldiphenylamine, di-p-dinonylphenylamine, or the like, or phenyl-α-naphthylamine, phenyl-β-naphthylamine and the like are suitable. It can be mentioned.

As for the compounding ratio of this (c) component, 0.1 weight% or more of the whole composition is preferable, and the range of 0.1-20 weight% is the most suitable especially.

In addition, a suitable amount of a known oily agent, extreme pressure agent, corrosion inhibitor, rust inhibitor, antifoaming agent or the like may be added to the composition of the present invention if desired.

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

Examples 1-12 and Comparative Examples 1-3

The following rolling experiment was done using the rolling lubricant of the specifications shown in Table 1.

Rolling experiment (rolling of aluminum plate)

As a rolled material, an aluminum plate of JIS A 5062 H16 (thickness 1.2 mm, plate width 60 mm, coil) was prepared and rolled at a rolling speed of 100 m / min, forward tension of 170 kgf, and front tension of 400 kgf using a four-stage rolling mill with a working roll diameter of 135 mm. It rolled using the rolling lubricant.

In addition, the rolling method adopts a method of rolling up the rolling reduction rate by 50.0 → 54.2 → 58.3 → 60.8 → 63.3 → 65.8 → 68.3 (%) step by step every 20m in one pass. The rolling force was measured for a sheet thickness of 0.38 mm (press down 68.3%), and the abrasive powder cleansing property, annealing property, and the rolling force were evaluated by the following method.

(a) Abrasive powder detergency evaluation method (tape test method)

The cellophane tape was stuck to the surface of the aluminum plate after rolling, and the adherent abrasive powder was extract | collected. This was attached to white paper to visually determine the degree of contamination by the abrasive powder, thereby evaluating the adhered abrasive powder washability on the surface of the aluminum plate. The results are shown in the first table.

(b) annealing evaluation method

The aluminum plate of the rolling mill was shortly cut to 10 cm in length, overlapped by several dozen sheets, fixed with a thick steel sheet, and annealed in a small annealing furnace.

The heating conditions of the annealing furnace were heated to 330 ° C. at a low velocity of 5 ° C. in an air atmosphere, maintained for 30 minutes, and cooled.

After the end of the heating, the degree of annealing stain on the annealing plate was visually judged to evaluate the sootability. The results are shown in the first table.

TABLE 1

Examples 13,14 and Comparative Examples 4,5

The following cutting test was done using the cutting lubricant of the specification shown in Table 2.

Cutting test (cutting of cylindrical section)

As a material for cutting, a cylindrical aluminum alloy (AC-4A-T6) with a diameter of 80 mm is prepared and cut using a cutting tool (carbide P20), cutting conditions of t (cutting depth) 1 mm and f (feed speed) 0.1 mm / rotation. The cylindrical cross section of the aluminum alloy was cut out.

After cutting, surface roughness (Rmax) of the cut section was measured and surface observation was performed. The results are shown in the second table.

TABLE 2

* 1, 2 Same as the first table.

As described above, when the lubricating oil composition of the present invention is used, the cleanability of the abrasive powder during the metal processing (rolling, drawing, blanking, drawing, cold forging, etc.) of plastics, cutting and grinding, etc. It improves, and the annealing property of a process material improves.

Therefore, the lubricating oil composition of the present invention is widely used and effectively used as a metal oil emulsion during composition processing, cutting processing or grinding processing of various metals or alloys including aluminum, aluminum alloys and aluminum thin films.

Claims (5)

(a) A lubricating oil composition for metal working comprising blending at least one compound of an alcohol, glycol, polyalkylene glycol, polyalkyleglycol derivative and fatty acid into a base oil mainly composed of 6 to 40 carbon atoms. (a) a base oil comprising a mixture of straight chain olefins having 6 to 40 carbon atoms with mineral oil or synthetic oil; and (b) a metallurgical lubricating oil composition comprising at least one compound of alcohols, glycols, polyalkylene glycols and fatty acids. . The lubricating oil composition for metal working according to claim 1 or 2, wherein (c) at least one compound of the phenol compound and the amine compound is blended. (a) A lubricating oil composition for metalworking, in which a base oil mainly composed of straight-chain olefins having 6 to 40 carbon atoms is mixed with (c) at least one compound of a phenol compound and an amine compound. (a) A metallurgical lubricating oil composition in which at least one compound of (c) a phenolic compound and an anionic compound is mixed with a base oil comprising a mixture of straight chain olefins having 6 to 40 carbon atoms with mineral oil or synthetic oil.