JPH06346081A - Press processing oil composition for aluminum alloy - Google Patents

Abstract

PURPOSE:To obtain the subject composition having good performance in the press processing of aluminum despite its low viscosity. CONSTITUTION:This oil composition can be obtained by incorporating a lubricating base oil 0.5-100cSt in the dynamic viscosity at 40 deg.C with (A) 0.1-10wt.% of a sulfur-based high-pressure agent (calculated as sulfur content) and (B) 0.1-50wt.% of an alkaline earth metal sulfonate based on the whole composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working oil composition for aluminum alloys, and more particularly to a press working oil composition for aluminum alloys having a low viscosity and good performance in press working of aluminum alloys.

[0002]

2. Description of the Related Art Conventionally, in the field of press working of aluminum alloys, press working oil obtained by adding an oily agent such as fats and oils to a lubricating base oil has been used.

[0003]

However, in recent years,
When an aluminum alloy is applied to parts having a complicated shape such as an automobile body, the conventional press oil has a problem that the plate is broken and the productivity is not improved. In order to prevent breakage of this plate, it is possible to deal with it to some extent by using press oil with high viscosity,
When a high-viscosity press oil is used, degreasing after processing becomes difficult, and the oil sandwiched between the plates causes the plates to adhere to each other, resulting in a decrease in workability in the automation line. It is an object of the present invention to provide a press working oil composition for aluminum alloy, which has good performance in press working of aluminum alloy while having low viscosity.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted extensive research to solve the above-mentioned problems, and as a result, by using a sulfur-based extreme pressure agent and a metal sulfonate in combination, the viscosity is low and the workability is excellent. It was found that a press working oil composition for aluminum alloy was obtained, and the present invention was completed.

The present invention has a kinematic viscosity of 0.5 at 40 ° C.
-1 to 100 cSt of lubricating base oil, (A) Sulfur-based extreme pressure agent as sulfur content based on the total amount of the composition is 0.1 to 1
The present invention provides a pressing oil composition for an aluminum alloy, which comprises 0% by weight and 0.1 to 50% by weight of (B) an alkaline earth metal sulfonate.

The contents of the present invention will be described in more detail below. The lubricating base oil of the present invention has a kinematic viscosity at 40 ° C. of 0.5 to 100 cSt, preferably 1 to 30 cSt, but the kind thereof is not particularly limited,
Any mineral oil type or synthetic type can be used as long as it is usually used as a base oil of a lubricating oil.

As the mineral oil-based lubricating base oil, for example, a lubricating oil fraction obtained by distilling crude oil under atmospheric pressure and vacuum distillation is used.
Oils such as paraffin oil and naphthenic oil which are refined by appropriately combining refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment can be used.

Examples of synthetic lubricating base oils include poly-α-olefins (polybutene, 1-octene oligomer, 1-decene oligomer, etc.), alkylbenzenes, alkylnaphthalenes, diesters (ditridecyl glutarate, di-2-decene). Ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di2-
Ethylhexyl sebacate etc.), polyol ester (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-
Ethyl hexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, polyphenyl ether, silicone oil, perfluoroalkyl ether, etc. can be used. These base oils may be used alone or in combination of two or more.

The component (A) referred to in the present invention is a sulfur-based extreme pressure agent. As the sulfur-based extreme pressure agent, specifically, for example, sulfurized whale oil, sulfurized lard oil, sulfurized vegetable oil, sulfurized fish oil, sulfurized fats and oils such as sulfurized esters; reacting olefins such as 1-butene with sulfur The olefin polysulfide obtained by the above; and dihydrocarbyl sulfide and the like.

Among these sulfur-based extreme pressure agents, sulfurized fats and oils are preferably used in the present invention, in particular, because the fats and oils in the molecule can be expected to improve the oiliness. When a sulfurized fat or oil is used as the sulfur-based extreme pressure agent in the present invention, the sulfur content is preferably 1 to 30% by weight, more preferably 5 to 5 from the viewpoint of easily adjusting the sulfur content in the lubricating oil composition. It is desirable to use 25% by weight.

The content of the component (A) in the present invention is 0.1 to 10% by weight, preferably 0.5 to 4% by weight, as a sulfur content, based on the total amount of the composition. If the content of the component (A) does not reach this range, the effect of improving the workability due to the synergistic effect with the component (B) is insufficient, while if the content exceeds this range, the lubricating oil composition It is not preferable because the viscosity becomes high and the workability in the automated press working line is deteriorated.

When sulfurized fats and oils are used as the sulfur-based extreme pressure agent in the present invention, the content of sulfurized fats and oils is
Usually, 2 to 50% by weight, preferably 3 based on the total amount of the composition.
Corresponds to ~ 30% by weight.

The component (B) referred to in the present invention is an alkaline earth metal sulfonate. The alkaline earth metal sulfonate as used herein has a molecular weight of about 100 to 150.
It is an alkaline earth metal salt of an alkylaromatic sulfonic acid obtained by sulfonating an alkylaromatic compound of 0, preferably 200 to 700. Specifically, the alkylaromatic sulfonic acid is a so-called petroleum oil. Examples thereof include sulfonic acid and synthetic sulfonic acid.

As the petroleum sulfonic acid referred to here, generally used are those obtained by sulfonating an alkyl aromatic compound of a lubricating oil fraction of mineral oil, and so-called mahogany acid produced as a by-product during the production of white oil. As the synthetic sulfonic acid, for example, an alkylbenzene having a linear or branched alkyl group, which is obtained as a by-product from an alkylbenzene production plant which is a raw material of a detergent or obtained by alkylating a polyolefin into benzene, is sulfonated. Or a sulfonated alkylnaphthalene such as dinonylnaphthalene is used. The sulfonating agent used for sulfonating these alkyl aromatic compounds is not particularly limited, and fuming sulfuric acid or sulfuric anhydride is usually used.

As the alkaline earth metal sulfonate, the above-mentioned alkyl aromatic sulfonic acid is directly reacted with an alkaline earth metal base (such as an alkaline earth metal oxide or hydroxide), or once as a sodium salt. Heating neutral sulfonates and excess alkaline earth metal salts or alkaline earth metal bases in the presence of water, as well as neutral (normal salt) sulfonates obtained by substituting alkaline earth metal salts with Also included are basic sulfonates obtained by the above, and overbased (superbasic) sulfonates obtained by reacting a neutral sulfonate with an alkaline earth metal base in the presence of carbon dioxide.

In the present invention, an overbased (ultrabasic) sulfonate, particularly a total base number (TB) is used because of its excellent synergistic effect on the press working performance with a sulfur-based extreme pressure agent.
N: HCl method) is preferably 200 to 500 mg KOH / g,
More preferably, it is desirable to use 250-450 mg KOH / g of overbased (overbased) sulfonate.

The content of the component (B) in the present invention is 0.1 to 50% by weight, preferably 1 to 50% by weight based on the total amount of the composition.
It is 20% by weight. When the content of the component (B) does not reach this range, the effect of improving the workability due to the synergistic effect with the component (A) is insufficient, while when the content exceeds the range, the lubricating oil composition It is not preferable because the viscosity becomes high and the workability in the automated press working line is deteriorated.

In the present invention, as described above, a press working oil composition for an aluminum alloy excellent in press working performance is obtained by simply using a specific amount of a sulfur-based extreme pressure agent and an alkaline earth metal sulfonate together with a lubricating base oil. The product can be obtained, and known lubricating oil additives can be used alone or in combination of several kinds for the purpose of further enhancing various performances thereof.

Examples of these additives include phosphoric acid esters such as tricresyl phosphate, fats and oils such as lard oil, and lubricity improvers typified by fatty acids;
Examples thereof include corrosion inhibitors such as amines, alkanolamines, amides and carboxylic acids; metal deactivators such as benzotriazole and thiadiazole; antifoaming agents such as methyl silicone, fluorosilicone and polyacrylate.

The addition amount of these known additives is arbitrary, but the content of the lubricity improver is usually 1 to 5 based on the total amount of the composition.
30% by weight, the content of the corrosion inhibitor is 0.5 to 5% by weight,
The content of the metal deactivator is usually 0.005 to 1% by weight,
The content of the defoaming agent is usually 0.0001 to 0.5% by weight.

The press working oil composition for an aluminum alloy according to the present invention is, for example, A specified in JIS H4000.
3004 material, A5005 material, A5052 material, A5182
Materials, aluminum alloy press materials such as A6061 materials, specifically, for example, deep drawing, overhanging,
It can be used for ironing and drawing.

[0022]

EXAMPLES Hereinafter, the contents of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these contents. (Examples 1 to 6) With the composition shown in Table 1, press working oil compositions for aluminum alloys according to the present invention were prepared (Examples 1 to 6). The following performance evaluation test was performed on this oil agent, and the results are shown in Table 1.

(Comparative Examples 1 to 13) For comparison, when only the base oil was used (Comparative Example 1), when the component (A) was used alone (Comparative Examples 2 to 4), and the component (B). When used alone (Comparative Example 5), when using only a known oiliness agent (Comparative Examples 6 to 9), and when using (A) component and a known oiliness agent in combination (Comparative Examples 10 to 13). The same performance evaluation test was conducted for the above, and the results are also shown in Table 1.

[Performance Evaluation Test (Measurement of Friction Coefficient)] Sample oil is applied to both surfaces of an aluminum alloy plate (material: A5000 series material) having a length of 300 mm, a width of 30 mm, and a thickness of 1 mm, and a metal block having convex portions. Sandwiched between (material: SKD11) and a metal block (material: SKD11) having a recess,
The force when pulling out the aluminum alloy plate in one direction was measured under the following conditions. The results are shown by converting the pulling force into a friction coefficient according to the following formula. Extraction conditions Block holding method: 400 kgf Extraction speed: 100 mm / min

[0025] *: Bending / unbending force at convex and concave

[0026]

[Table 1]

As is clear from the results shown in Table 1, the compositions of Examples according to the present invention show a large reduction in the friction coefficient as compared with Comparative Example 1 in which nothing is added. On the other hand,
When the component (A) is used alone (Comparative Examples 2 to 4),
When the component (B) is used alone (Comparative Example 5), when only a known oiliness agent is used (Comparative Examples 6 to 9), and (A).
When a component and a known oiliness agent are used in combination (Comparative Examples 10 to 1)
In 3), the same amount of additive as each of Examples 1 to 5 is added. However, although these compositions show a reduction in the friction coefficient as compared with Comparative Example 1, the degree of reduction is inferior as compared with the Examples, and the synergistic effect of the (A) component and (B) component of the present invention. The effect is obvious.

[0028]

The press working oil composition for aluminum alloys of the present invention has a kinematic viscosity at 40 ° C. of 0.5 to 100 cS.
0.1 to 10% by weight of (A) a sulfur-based extreme pressure agent as a sulfur content, and (B) an alkaline earth metal sulfonate of 0.1 to 50 based on the total amount of the composition of the lubricating base oil of t.
It is contained by weight%, and by using (A) a sulfur-based extreme pressure agent and (B) a metal sulfonate together, it has a low viscosity and is excellent in press workability. The press working oil composition for aluminum alloys of the present invention does not cause rupture of plates or adhesion of plates to each other even when applied to aluminum alloy parts having a complicated shape such as an automobile body, thereby improving workability in an automation line. Since it can be improved, it has high industrial utility value.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C10N 10:04 20:02 30:06 40:24 A 8217-4H (72) Inventor Tsunehara Sugawara Kanagawa 8 Chidori-cho, Naka-ku, Yokohama-shi, Japan Inside Nippon Oil Oil Co., Ltd.

Claims (1)

[Claims] 1. A kinematic viscosity at 40 ° C. of 0.5 to 100.
0.1 to 10% by weight of (A) sulfur-based extreme pressure agent as the sulfur content based on the total amount of the composition relative to the base oil of cSt
And (B) an alkaline earth metal sulfonate.
A press working oil composition for an aluminum alloy, containing 1 to 50% by weight.