JP2007211100A - Lubricant composition for aluminum alloy plate material, and aluminum alloy plate material and method for press-forming aluminum alloy plate material by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricant for an aluminum alloy plate material, achieving an excellent press-forming in the press-forming of the aluminum alloy plate material, which was impossible with conventional lubricants, and the aluminum alloy plate material and a method for press-forming the aluminum alloy plate material by using the same. <P>SOLUTION: This lubricant for the aluminum alloy plate material is characterized by using ≥1 kind selected from mineral oil or synthetic oil as base oil and containing 10 to 50 mass% ≥1 kind selected from monoesters expressed by general formula (1) [wherein, any of R<SB>1</SB>, R<SB>2</SB>is a linear hydrocarbon chain having ≥13 carbon number, wherein, R<SB>1</SB>has ≤21 carbon number and R<SB>2</SB>has ≤18 carbon number, and another one of the R<SB>1</SB>, R<SB>2</SB>is a linear hydrocarbon having ≥1 carbon number wherein R<SB>1</SB>has ≤7 carbon number and R<SB>2</SB>has ≤8 carbon number, or a branched hydrocarbon chain having ≥3 carbon number, wherein R<SB>1</SB>has ≤17 carbon number and R<SB>2</SB>has ≤18 carbon number] and 5-40 mass% ≥1 kind selected from a 11-17C oxoalcohol. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lubricating composition for an aluminum alloy plate material that realizes excellent press formability in press working of an aluminum alloy plate material, an aluminum alloy plate using the same, and a press forming method of the aluminum alloy plate.

  Aluminum alloy sheets are lighter than steel sheets and have excellent corrosion resistance, and are therefore used in various industrial fields. In recent years, the frequency of use of aluminum alloy sheets has been increasing for the purpose of reducing the weight of automobiles, but aluminum alloy sheets are inferior in formability compared to steel sheets. There is a problem that cracks are likely to occur. Therefore, the aluminum alloy plate is limited to use for parts that are relatively easy to form such as a hood and a roof in a mass-produced vehicle.

  As means for solving this problem, many methods have been proposed, such as a method of press forming by heating or cooling to a temperature at which the aluminum alloy sheet has good formability, and a lubricant for imparting lubricity to the aluminum alloy sheet. Yes.

  As a method of heating and press-molding, for example, in the name of “warm deep drawing method of aluminum plate material”, at least a surface and a corner portion in contact with a work piece in a die for a deep drawing die and a blank holder And an industrial lubricant (grease, soap, wax, emulsion, etc.) in which mica powder is mixed and dispersed in a weight ratio of 5% to 20% before processing. A method has been proposed in which animal or vegetable oils or fats or synthetic esters are applied to the surface of a workpiece, and the die and blank holder are heated and press-molded (see Patent Document 1).

  As a method of cooling and press forming, for example, under the name of “a press working method and apparatus for an aluminum or aluminum alloy plate and a thermostatic device used for the processing method”, (a) a material of the aluminum or aluminum alloy plate is used. A step of cooling to a low temperature region with a refrigerant, (b) a step of holding the material in the cooling region and performing a molding process with a molding die, (c) a step of returning the material after the molding process to room temperature with a thermostatic device, (d) There has been proposed a press molding method including a step of trimming a material after returning to normal temperature with a trim die (see Patent Document 2).

  As a lubricant for imparting lubricity to an aluminum alloy plate, for example, in the name of “metalworking oil composition”, an n-α-olefin having 10 to 20 carbon atoms and a total base number of 30% by weight or more are used. Has proposed a composition containing 450 to 600 mg KOH / g of overbased sulfonate such that the total base number of the composition is 12.5 to 200 mg KOH / g (see Patent Document 3).

In addition, in the name of “lubricating oil composition for rolling aluminum foil”, decyl alcohol 0.5 to 5% by weight with respect to a base oil having a kinematic viscosity at 40 ° C. of 1.0 to 4.5 cSt, A composition containing 0.5 to 4% by weight of an ester and blending a total of decyl alcohol and monoester at a ratio of 1 to 8% by weight has been proposed (see Patent Document 4).
Japanese Patent Publication No. 7-90293 (Claim 1) Japanese Patent No. 3287148 (Claim 1) Japanese Patent No. 2927644 (Claim 1) Japanese Patent No. 2537522 (Claim 1)

  However, in the press molding method proposed in Patent Document 1, since it is necessary to heat the mold, it is necessary to prepare a special mold, and electric power for heating the mold is also required. Therefore, an increase in manufacturing cost is inevitable. Further, since the processing is performed under high temperature conditions, the lubricant may adhere to the mold or the molded product, which may cause a molding failure or cause a problem in the degreasing property of the molded product.

  Further, in the press molding method proposed in Patent Document 2, it is necessary to prepare equipment for cooling the material, equipment for processing while being held in a cooling zone, and equipment for returning the molded product to room temperature. There is also a need for electric power for holding the raw material in the cooling-cooling region and returning the processed-molded product to room temperature, so an increase in manufacturing cost is inevitable.

  Further, in the lubricant proposed in Patent Document 3, when stored for a long time in a state where the lubricant is adhered, since the base number of the composition is high, in aluminum that is easily corroded in an alkaline region, discoloration or There is a possibility that white rust or the like may occur or that the degreasing property is lowered.

  In addition, the lubricant proposed in Patent Document 4 has insufficient lubricity, and the lubricating components are low molecular weight alcohols and monoesters. No significant improvement can be expected.

  The present invention has been made to cope with these problems, and its purpose is to achieve excellent press forming without temperature control during press forming in press working of an aluminum alloy sheet material that was impossible with conventional lubricants. It is an object of the present invention to provide a lubricating composition for an aluminum alloy plate material that realizes the properties, an aluminum alloy plate using the same, and a press forming method of the aluminum alloy plate.

  The present invention relates to a lubricating composition for an aluminum alloy sheet, an aluminum alloy sheet using the same, and a press forming method for the aluminum alloy sheet, and the lubricating composition for an aluminum alloy sheet according to the present invention is a mineral oil or a synthetic oil. One or more selected from the following formula is used as a base oil, and the following general formula (1)

（式中、Ｒ₁、Ｒ₂のいずれか一方は炭素数１３以上で、Ｒ₁の炭素数が２１以下、Ｒ₂の炭素数が１８以下の直鎖飽和炭化水素鎖であり、そして他方は炭素数１以上で、Ｒ₁の炭素数が７以下、Ｒ₂の炭素数が８以下の直鎖または炭素数３以上で、Ｒ₁の炭素数が１７以下、Ｒ₂の炭素数が１８以下の分岐飽和炭化水素鎖である。）
で表されるモノエステルから選択される１種以上を１０〜５０質量％と、炭素数１１〜１７のオキソアルコールから選択される１種以上を５〜４０質量％とを含有することを特徴とするものである。

(In the formula, either one of R ₁ and R ₂ is a linear saturated hydrocarbon chain having 13 or more carbon atoms, R ₁ having 21 or less carbon atoms, and R ₂ having 18 or less carbon atoms, and the other is 1 or more carbon atoms, R ₁ carbon number of 7 or less, R ₂ carbon number of 8 or less, straight chain or 3 or more carbon atoms, R ₁ carbon number of 17 or less, R ₂ carbon number of 18 or less Branch branched saturated hydrocarbon chain.)
It contains 10 to 50% by mass of one or more selected from monoesters represented by the formula: 5 to 40% by mass of one or more selected from oxo alcohols having 11 to 17 carbon atoms. To do.

  The lubricating composition for an aluminum alloy sheet according to the present invention functions as a lubricant when press-molding the aluminum alloy sheet, and the lubricating composition for an aluminum alloy sheet according to the present invention is coated with aluminum. It functions as a rust inhibitor that suppresses corrosion and discoloration of the alloy sheet.

  The monoester and oxo alcohol, which are constituents of the lubricating composition for aluminum alloy sheets according to the present invention, have a main chain of a long-chain linear saturated hydrocarbon, and are applied to the aluminum alloy sheet to obtain an aluminum alloy. A dense adsorption layer is formed on the surface of the plate. When press-molding aluminum alloy sheets, this adsorption layer is interposed between the aluminum alloy sheet surface and the mold surface, thereby reducing the friction coefficient of the sliding part and preventing the occurrence of galling or welding. Can do.

  In the lubricating composition for aluminum alloy sheet materials according to the present invention, the oxo alcohol is an oxo alcohol produced by an oxo method using a linear α-olefin having 10 to 16 carbon atoms as a raw material, and the following general formula (2)

（式中、Ｒ₃は炭素数１１〜１７の直鎖飽和炭化水素鎖。）と下記一般式（３）

(Wherein R ₃ is a linear saturated hydrocarbon chain having 11 to 17 carbon atoms) and the following general formula (3)

（式中、Ｒ₄は炭素数８〜１４の直鎖飽和炭化水素鎖。）で表されるアルコールとの混合物であることが好ましい。

(Wherein R ₄ is a straight-chain saturated hydrocarbon chain having 8 to 14 carbon atoms) and is preferably a mixture with an alcohol.

  According to the lubricating composition for aluminum alloy sheet material according to the present invention, the pour point of the composition is lowered, and in winter when the temperature is low, the aluminum alloy sheet material lubricating composition can be prevented from solidifying, Moreover, sufficient lubricity can be obtained.

  In the lubricating composition for aluminum alloy sheet materials according to the present invention, the ratio of the mixture of the general formula (2) and the general formula (3) is preferably in the range of 1: 9 to 9: 1 by mass ratio. .

  According to the lubricating composition for an aluminum alloy sheet according to the present invention, the lubricating composition for an aluminum alloy sheet can be further prevented from solidifying, and sufficient lubricity can be obtained.

  In the lubricating composition for aluminum alloy sheet materials according to the present invention, it is preferable to further contain 0.1 to 10% by mass of one or more selected from polyhydric alcohol esters of lanolin fatty acid.

  Monoesters and oxo alcohols having a straight chain saturated hydrocarbon main chain are excellent in lubricity, but the pour point increases as the main chain becomes longer, resulting in a tendency for the pour point of the composition to increase. However, the lubricating composition for aluminum alloy sheet materials according to the present invention can lower the pour point of the composition by adding a lanolin fatty acid ester having a pour point depressing action.

  In the lubricating composition for aluminum alloy sheet material according to the present invention, it is preferable that the acid value of the lubricating composition for aluminum alloy sheet material is 1.5 mgKOH / g or less and the base value is 4 mgKOH / g or less.

  According to the lubricating composition for an aluminum alloy sheet according to the present invention, corrosion and discoloration hardly occur when stored in a state where the lubricating composition is applied to the aluminum alloy sheet, and the degreasing property can be prevented from being lowered.

In the aluminum alloy plate according to the present invention, the lubricant composition for an aluminum alloy sheet is characterized in that it is applied ^{0.2g / m 2 ~5g / m 2} .

  According to the aluminum alloy plate of the present invention, corrosion and discoloration of the aluminum alloy plate can be suppressed, and at the time of press forming, the friction coefficient of the sliding portion is reduced and generation of galling, welding, etc. Can be prevented.

  In the aluminum alloy press forming method for press forming the aluminum alloy plate, the aluminum alloy plate is used for press forming.

  According to the press molding method according to the present invention, it is possible to reduce the friction coefficient of the sliding portion and to prevent the occurrence of galling or welding.

  That is, the lubricating composition for an aluminum alloy sheet according to the present invention, the aluminum alloy sheet using the same, and the press molding method for the aluminum alloy sheet provide excellent lubricity during press molding of the aluminum alloy sheet. It is extremely useful in industry.

  The lubricating composition for aluminum alloy sheet materials according to the present invention comprises at least one selected from mineral oil or synthetic oil as a base oil, and the following general formula (1) as a lubricating component

（式中、Ｒ₁、Ｒ₂のいずれか一方は炭素数１３以上で、Ｒ₁の炭素数が２１以下、Ｒ₂の炭素数が１８以下の直鎖飽和炭化水素鎖であり、そして他方は炭素数１以上で、Ｒ₁の炭素数が７以下、Ｒ₂の炭素数が８以下の直鎖または炭素数３以上で、Ｒ₁の炭素数が１７以下、Ｒ₂の炭素数が１８以下の分岐飽和炭化水素鎖である。）
で表されるモノエステルから選択される１種以上を１０〜５０質量％と、炭素数１１〜１７のオキソアルコールから選択される１種以上を５〜４０質量％とを含有することを特徴とするものである。
つまり、Ｒ₁、Ｒ₂のいずれか一方は炭素数１３以上で、Ｒ₁が直鎖飽和炭化水素の場合、炭素数の上限は２１、Ｒ₂が直鎖飽和炭化水素の場合、炭素数の上限は１８であり、他方は、直鎖飽和炭化水素の場合、炭素数の上限はＲ₁では７、Ｒ₂では８、分岐飽和炭化水素の場合、炭素数の上限はＲ₁では１７、Ｒ₂では１８である。

(In the formula, either one of R ₁ and R ₂ is a linear saturated hydrocarbon chain having 13 or more carbon atoms, R ₁ having 21 or less carbon atoms, and R ₂ having 18 or less carbon atoms, and the other is 1 or more carbon atoms, R ₁ carbon number of 7 or less, R ₂ carbon number of 8 or less, straight chain or 3 or more carbon atoms, R ₁ carbon number of 17 or less, R ₂ carbon number of 18 or less Branch branched saturated hydrocarbon chain.)
It contains 10 to 50% by mass of one or more selected from monoesters represented by the formula: 5 to 40% by mass of one or more selected from oxo alcohols having 11 to 17 carbon atoms. To do.
That is, when either R ₁ or R ₂ has 13 or more carbon atoms and R ₁ is a linear saturated hydrocarbon, the upper limit of the carbon number is 21, and when R ₂ is a linear saturated hydrocarbon, The upper limit is 18; on the other hand, in the case of straight-chain saturated hydrocarbons, the upper limit of carbon number is 7 for R ₁ , 8 for R ₂ , and for branched saturated hydrocarbons, the upper limit for carbon number is 17 for R ₁ , R ₂ is 18.

  The aluminum alloy used for the aluminum alloy sheet is not particularly specified, but an aluminum alloy used for automobile applications is desirable. Examples of the aluminum alloy include A3004, A5052, A5083, A5454, AA5022, AA5023, AA6016, AA6022, and AA6111.

(Base oil)
As the base oil, a mineral oil or a synthetic oil generally used as a base oil such as a rust preventive oil or a metalworking oil can be employed. In this case, one type of base oil can be used alone, and two or more types of base oils can be used in combination. Examples of the mineral oil include, for example, refined mineral oils such as paraffinic, naphthenic, and aromatics obtained by purifying a fraction obtained by distilling crude oil. Synthetic oils include, for example, paraffinic, naphthenic, Examples include olefin-based and aromatic-based hydrocarbon-based synthetic oils and ester-based synthetic oils.

(Lubricating component)
The monoester represented by the general formula (1) as the lubricating component is an ester compound of a saturated aliphatic monocarboxylic acid and a saturated aliphatic monoalcohol, which is a saturated aliphatic monocarboxylic acid or a saturated aliphatic monoalcohol. At least one of them is a straight-chain saturated hydrocarbon chain having 13 or more carbon atoms, R ₁ having 21 or less carbon atoms, R ₂ having 18 or less carbon atoms, and the other having 1 or more carbon atoms and the carbon number of R ₁ An ester compound having a branched saturated hydrocarbon chain having a carbon number of 7 or less, a straight chain having 8 or less carbon atoms in R ₂ or 3 or more carbon atoms, a carbon number in R ₁ of 17 or less and a carbon number in R ₂ of 18 or less The monoesters can be used alone or in combination of two or more. Even if both R ₁ and R ₂ are straight chain saturated hydrocarbon chains having less than 13 carbon atoms, or one of R ₁ and R ₂ is a saturated hydrocarbon chain having 13 or more carbon atoms, it does not have a straight chain structure. In such a case, the lubricity is insufficient, which is not preferable. In the case of a straight-chain saturated hydrocarbon chain in which _one of R ₁ and R ₂ has 13 or more carbon atoms, R ₁ has 21 or less carbon atoms, and R ₂ has 18 or less carbon atoms, Coagulation can be suppressed, which is more preferable. When the other is a straight-chain saturated hydrocarbon chain, if R ₁ has 7 or less carbon atoms and R ₂ has 8 or less carbon atoms, solidification at low temperatures can be suppressed, and the other is branched. In the case of a saturated hydrocarbon chain, when the carbon number of R ₁ is 17 or less and the carbon number of R ₂ is 18 or less, a decrease in lubricity can be suppressed, which is more preferable. Moreover, when it has an unsaturated hydrocarbon chain, it is easy to oxidatively deteriorate, and there exists a possibility of causing generation | occurrence | production of corrosion and discoloration, and a fall of degreasing property. In addition, an ester having a plurality of ester bonds in the molecule, such as a diester or triester, cannot form a dense adsorbed film due to steric hindrance due to its complicated molecular structure, and thus the required lubricity cannot be obtained. Furthermore, since it has several ester bonds in a molecule | numerator, there exists a problem that the saponification value of a composition becomes high and degreasing property is inferior. Here, 10-50 mass% is preferable and, as for content of monoester, 20-40 mass% is more preferable. When the monoester content is less than 10% by mass, the lubricity is insufficient, and even if the monoester content exceeds 50% by mass, the lubricity is not so high and uneconomical. There is a risk of degreasing.

Examples of the monoester represented by the general formula (1) include methyl myristate, ethyl myristate, propyl myristate, isopropyl myristate, 2-ethylhexyl myristate, isostearyl myristate, methyl pentadecanoate, and ethyl pentadecanoate. Propyl pentadecanoate, isopropyl pentadecanoate, 2-ethylhexyl pentadecanoate, isostearyl pentadecanoate, methyl palmitate, ethyl palmitate, propyl palmitate, isopropyl palmitate, 2-ethylhexyl palmitate, isostearyl palmitate, methyl heptadecanoate , Ethyl heptadecanoate, propyl heptadecanoate, isopropyl heptadecanoate, 2-ethylhexyl heptadecanoate, isostearyl heptadecanoate Methyl stearate, ethyl stearate, propyl stearate, isopropyl stearate, 2-ethylhexyl stearate, isostearyl stearate, methyl icosanoate, ethyl icosanoate, propyl icosanoate, isopropyl icosanoate, 2-ethylhexyl icosanoate, icosane Isostearyl acid, methyl docosanoate, ethyl docosanoate, propyl docosanoate, isopropyl docosanoate, 2-ethylhexyl docosanoate, isostearyl docosanoate, myristyl 2-ethylhexanoate, pentadecyl 2-ethylhexanoate, 2-ethylhexanoic acid Examples include palmityl, heptadecyl 2-ethylhexanoate, stearyl 2-ethylhexanoate, and the like.
These can be used alone or in combination of two or more.

  Examples of the oxo alcohol having 11 to 17 carbon atoms as the lubricating component include alcohols produced by the oxo method. Examples of the method for producing alcohols by the oxo method include carbon monoxide and hydrogen in an olefin in the presence of a catalyst. There is a method for producing an alcohol by reacting to an aldehyde and then hydrogenating the aldehyde. One kind of oxo alcohol can be used alone, and two or more kinds can be used in combination. If the carbon number of the oxoalcohol is less than 11, the lubricity is insufficient, and if the carbon number exceeds 17, the pour point of the composition becomes too high, and there is a risk of causing problems in use such as solidification in the winter when the temperature is low. is there. Examples of alcohols other than oxo alcohols include fatty alcohols obtained by catalytic reduction of fatty acids and Gerve alcohols obtained by condensing fatty alcohols. Fatty alcohols produced from saturated fatty acids are alcohols. Since the pour point is high, it solidifies in the winter when the temperature is low. In addition, fatty alcohols produced from unsaturated fatty acids are characterized by low alcohol pour point and excellent low-temperature properties, but are prone to oxidative degradation, which may lead to the occurrence of corrosion / discoloration and reduced degreasing properties. . Gelbealcohol is a branched chain alcohol and has a low alcohol pour point and excellent low-temperature properties. However, because of its steric hindrance due to its complex molecular structure, it cannot form a dense adsorbed film. I can't get sex. 5-40 mass% is preferable and, as for content of oxo alcohol, 10-30 mass% is more preferable. When the oxoalcohol content is less than 5% by mass, the lubricity is insufficient, and even when the oxoalcohol content exceeds 40% by mass, the lubricity does not increase so much and is not economical. There is a risk of degreasing.

  In the lubricating composition for aluminum alloy sheet materials according to the present invention, the oxo alcohol is an oxo alcohol produced by an oxo method using a linear α-olefin having 10 to 16 carbon atoms as a raw material, and the following general formula (2)

（式中、Ｒ₃は炭素数１１〜１７の直鎖飽和炭化水素鎖。）と下記一般式（３）

(Wherein R ₃ is a linear saturated hydrocarbon chain having 11 to 17 carbon atoms) and the following general formula (3)

（式中、Ｒ₄は炭素数８〜１４の直鎖飽和炭化水素鎖。）で表されるアルコールの混合物であることが好ましい。

(In the formula, R ₄ is preferably a linear saturated hydrocarbon chain having 8 to 14 carbon atoms).

  Examples of the alcohol represented by the general formula (2) include undecyl alcohol, lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, and heptadecyl alcohol.

  Examples of the alcohol represented by the general formula (3) include 2-methyl-1-decanol, 2-methyl-1-undecanol, 2-methyl-1-dodecanol, 2-methyl-1-tridecanol, and 2-methyl-1. -Tetradecanol, 2-methyl-1-pentadecanol, 2-methyl-1-hexadecanol can be mentioned.

  The content ratio of the alcohol represented by the general formula (2) and the alcohol represented by the general formula (3) is preferably in the range of 1: 9 to 9: 1 by mass ratio. More preferably, it is the range of 3: 7-7: 3. When the content ratio of the alcohol represented by the general formula (2) is too large, the pour point of the composition becomes high, which may cause problems in use such as solidification in winter when the temperature is low. When the content ratio of the alcohol represented by the general formula (2) is too small, sufficient lubricity cannot be obtained.

(Pour point depressing component)
In the lubricating composition for an aluminum alloy sheet according to the present invention, the pour point of the composition is preferably 0 ° C. or lower in order to prevent solidification in winter. By containing one or more selected from polyhydric alcohol esters of lanolin fatty acid, preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, the alcohol or ester is crystallized in a low temperature environment. Loss of fluidity can be effectively suppressed. That is, in the lubricating composition for an aluminum alloy sheet according to the present invention, the polyhydric alcohol ester of lanolin fatty acid functions as a pour point depressant and has a pour point of 0 ° C. or lower. Although many pour point depressants for the same effect are commercially available, in the lubricating composition for aluminum alloy sheet materials according to the present invention, the polyhydric alcohol ester of lanolin fatty acid is compared with the existing pour point depressants. This method is more effective and is superior in that it has less adverse effects on lubricity, rust prevention, degreasing, and the like.

  Examples of the polyhydric alcohol constituting the polyhydric alcohol ester of lanolin fatty acid include neopentyl glycol, trimethylolpropane, pentaerythritol, glycerin, sorbitol and the like. The polyhydric alcohol ester of lanolin fatty acid may be a full ester of these polyhydric alcohols and lanolin fatty acid, or may be a partial ester. Further, a part of the fatty acid constituting the ester may be a fatty acid other than the lanolin fatty acid.

  The pour point of the polyhydric alcohol ester of lanolin fatty acid is preferably 40 ° C. or lower, more preferably 20 ° C. or lower. When the pour point exceeds 40 ° C., the polyhydric alcohol ester of lanolin fatty acid itself precipitates at low temperatures, which may deteriorate the properties.

  When the content of the polyhydric alcohol ester of lanolin fatty acid is less than 0.1% by mass, the improvement of the pour point depressing action is insufficient, and the content of the polyhydric alcohol ester of lanolin fatty acid is 10% by mass. Even if it exceeds, the pour point depressing action does not increase so much, which is uneconomical and may cause a decrease in degreasing properties. Moreover, when it adds excessively, the polyhydric-alcohol ester of lanolin fatty acid itself precipitates at the time of low temperature, and there exists a possibility that a property may deteriorate.

(Rust prevention component)
In the lubricating composition for aluminum alloy sheets according to the present invention, considering the case where the aluminum alloy sheet is stored in a state where the lubricating composition is applied, the above-described configuration is intended to prevent corrosion and discoloration of the aluminum alloy sheet. It is preferable to add a rust preventive additive in addition to the components. As rust preventive additives, sulfonates, carboxylic acids, carboxylates, and esters can be employed, and one of these can be used alone and two or more of them can be used in combination. You can also The content of the rust preventive additive is 10% by mass or less. Even if the content of the rust preventive additive exceeds 10% by mass, the rust preventive property does not increase so much, which is uneconomical, and there is a possibility that the degreasing property is lowered.

  Examples of the sulfonates include, for example, petroleum sulfonic acids obtained by sulfonating aromatic components of petroleum distillate components, and alkali metal salts and alkaline earth metal salts of synthetic sulfonic acids such as dodecylbenzenesulfonic acid and dinonylnaphthalenesulfonic acid. And amine salts.

  Examples of the carboxylic acid include caproic acid, isocaproic acid, heptanoic acid, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid, undecanoic acid, undecylenic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid Acid, heptadecanoic acid, stearic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, stearolic acid, nonadecanoic acid, arachidic acid, arachidonic acid, behenic acid, setoleic acid, erucic acid, brassic acid, lignoceric acid, serotic acid , Heptacosanoic acid, montanic acid, mellicic acid, lacteric acid, naphthenic acid, abietic acid, adipic acid, sebacic acid, phthalic acid, trimellitic acid, lanolin fatty acid, alkenyl succinic acid, oxidized wax and the like.

  Examples of the carboxylate include alkali metal salts, alkaline earth metal salts, and amine salts of the above-described carboxylic acids.

  Examples of the carboxylic acid ester include ester compounds of the above carboxylic acids and alcohols. Examples of the alcohol include methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, sec-butyl alcohol, tert-butyl alcohol, amyl alcohol, isoamyl alcohol, neopentyl alcohol, tert-amyl alcohol, sec. -Isoamyl alcohol, hexyl alcohol, isohexyl alcohol, heptyl alcohol, octyl alcohol, 2-ethylhexyl alcohol, capryl alcohol, nonyl alcohol, decyl alcohol, undecyl alcohol, lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl Alcohol, heptadecyl alcohol, stearyl alcohol, isostearyl alcohol Call, oleyl alcohol, nonadecyl alcohol include eicosyl alcohol, ceryl alcohol, melissyl alcohol, neopentyl glycol, trimethylol propane, pentaerythritol, glycerol, sorbitol, polyalkylene glycols and the like.

  In addition, the lubricating composition for aluminum alloy sheet according to the present invention is not limited to the above components only, and if necessary, oiliness improver, extreme pressure additive, friction modifier, antifoaming agent, interface Activators, antioxidants and the like can be added.

In the lubricating composition for aluminum alloy sheet materials according to the present invention, the kinematic viscosity at 40 ° C. of the composition is preferably 20 mm ² / sec or less, and more preferably 10 mm ² / sec or less. When the kinematic viscosity exceeds 20 mm ² / sec, the adhesion when a plurality of aluminum alloy sheet materials coated with the composition are stacked increases, and handling becomes worse. Moreover, there exists a possibility of causing a degreasing fall.

In the lubricating composition for aluminum alloy sheets according to the present invention, the acid value of the composition is preferably 1.5 mgKOH / g or less, and the base value is preferably 4 mgKOH / g or less, more preferably an acid value of 1 mgKOH / g or less. The base number is 3 mgKOH / g or less. When the acid value of the composition exceeds 1.5 mgKOH / g, corrosion and discoloration are likely to occur when stored in a state where the lubricating composition is applied to the aluminum alloy sheet, and there is a risk of degreasing. Similarly, if the base number of the composition exceeds 4 mgKOH / g, corrosion and discoloration are likely to occur when stored in a state where the lubricating composition is applied to an aluminum alloy sheet, and there is a risk of degreasing.
Here, by controlling the content of each component within a predetermined range, the acid value of the composition can be 1.5 mgKOH / g or less, and the base value can be 4 mgKOH / g or less.

In the aluminum alloy plate according to the present invention, the lubricant composition for an aluminum alloy sheet is characterized in that it is applied ^{0.2g / m 2 ~5g / m 2} .

  The method of using the lubricating composition for the aluminum alloy sheet according to the present invention is not particularly limited, and when press working, the aluminum alloy sheet immediately before forming may be spray-coated or a roll coater. You may apply | coat using etc. Moreover, you may apply | coat to a shaping die, without apply | coating to an aluminum alloy board | plate material. Furthermore, the aluminum alloy plate material manufacturer may apply in advance before shipping the aluminum alloy plate material.

Next, an aluminum alloy sheet press forming method according to the present invention will be described.
FIG. 1 is a flowchart showing a press forming method of an aluminum alloy plate according to the present invention.
As shown in FIG. 1, first, through various steps in the manufacture of an aluminum alloy plate (S1), the aluminum alloy plate is made into a coil state (S2).
Here, the process until the coil is formed can employ a normally performed process, but is not particularly limited.
Next, the lubricating composition for the aluminum alloy sheet is applied to the coil (S3).
The method for applying the lubricating composition for aluminum alloy sheet in this case is not particularly limited as long as a predetermined amount can be applied to the aluminum alloy sheet. However, in order to apply uniformly, roll coating, spraying by spraying, Electrocoating oil or the like is preferable.
Next, the coiled aluminum alloy plate coated with the lubricating composition is cut (S5), but before that, the coiled aluminum alloy coated with the lubricating composition may be temporarily stored (S4).
Next, the aluminum alloy plate coated with the lubricating composition is press-formed (S6).

FIG. 2 is a flowchart showing another aluminum alloy sheet press forming method according to the present invention.
As shown in FIG. 2, first, through various steps in the manufacture of an aluminum alloy plate (S7), the aluminum alloy plate is made into a coil state (S8).
Here, the process until the coil is formed can employ a normally performed process, but is not particularly limited.
Next, the aluminum alloy plate is cut into a plate state (S9).
Next, the lubricating composition for the aluminum alloy sheet is applied to the aluminum alloy sheet having the plate shape (S10).
The method for applying the lubricating composition for aluminum alloy sheet in this case is not particularly limited as in the embodiment of FIG. 1, but for uniform application, roll coating, spraying by spraying, electrostatic oiling, etc. Is preferred.
Next, the plate-shaped aluminum alloy plate coated with the lubricating composition is press-molded (S12), but before that, the plate-shaped aluminum alloy coated with the lubricating composition may be temporarily stored (S11). ).

In addition, the press molding method of the aluminum alloy plate according to the present invention is not limited to the above embodiment.
According to these press molding methods according to the present invention, it is possible to reduce the friction coefficient of the sliding portion and to prevent the occurrence of galling or welding.

According to the lubricating composition for aluminum alloy sheet according to the present invention, it functions as a lubricant when press-molding the aluminum alloy sheet, and the lubricating composition for aluminum alloy sheet according to the present invention is applied. It has a function as a rust preventive that suppresses corrosion and discoloration of the aluminum alloy sheet.
Also, during press molding of aluminum alloy sheet material, an adsorption layer is interposed between the aluminum alloy sheet material surface and the mold surface, thereby reducing the friction coefficient of the sliding portion and preventing the occurrence of galling or welding. be able to.
Moreover, according to the lubricating composition for aluminum alloy sheet materials according to the present invention, since the pour point of the composition is low, it can be used without solidifying even in winter when the temperature is low.
Further, when the aluminum alloy sheet is stored in a state where the lubricating composition is applied, corrosion and discoloration hardly occur, and the degreasing property can be prevented from being lowered.

  In this example, various lubricating compositions were prepared, a test for confirming press moldability using these lubricating compositions as test oil (press molding test), a test for confirming low temperature properties (low temperature property confirmation test), A test (degreasing test) for confirming degreasing was performed.

(Test oil): In the preparation of the test oil, two types of base oils shown in Table 1, eight types of lubricating components, two types of pour point depressing components, and two types of rust preventive components are adopted. Were prepared in appropriate combinations. The components used are summarized in Table 1.
Here, in the lubricating composition, as monoester, a: 2-ethylhexyl palmitate, as oxo alcohol, a: C11 oxo alcohol, b: C13 oxo alcohol, pour point depressing component, a: trimethylol Propananolin fatty acid triester satisfies the constitution of the claimed invention.
Among the lubricating compositions, as monoester, b: methyl laurate, as alcohol, c: C9 oxo alcohol, d: C19 oxo alcohol, e: C12 fatty alcohol (lauryl alcohol), f: C20 gel alcohol Among the pour point depressing components, b: trimethylolpropane trioleate does not satisfy the constitution of the claimed invention.

Further, the composition of the prepared test oil and the kinematic viscosity at 40 ° C. are shown in Table 2 (Examples) and Table 3 (Comparative Examples). However, in Table 2 and Table 3, the unit of addition amount is mass%, the unit of kinematic viscosity is (mm ² / sec), the unit of acid value is (mgKOH / g), and the unit of base number is (mgKOH / g) It is. Moreover, each (-) column in Table 2 and Table 3 has shown not containing the applicable component.
In Table 3, those not satisfying the structure of the claimed invention are underlined in the numerical values.
The acid value was measured according to JIS standard K2501.5.1.1 (indicator titration method), and the base value was measured according to JIS standard K2501.5.2.2 (potentiometric titration method).

<Press molding test>
An aluminum alloy sheet (A5182-O test piece shape 1.0 mm × 84 mmφ blank) was used as a test piece, and 2 g / m ² of test oil was applied to the surface of each test piece using a rubber roller. A specimen was prepared. Using each of these specimens, a cylindrical punch of 40 mmφ (material SKD-11 punch R8 mm) and a die of 42.5 mmφ (material SKD-11 die R8 mm), blank holder pressing load 1000 kgf (980 N), molding speed A cylindrical drawing test was conducted under the condition of 240 mm / min, and the lubricating performance of each specimen was evaluated.

  The evaluation standard for lubrication performance is the maximum cylindrical drawing height at which cracks do not occur, the moldability (excellent) ◎ when the drawing height is 20 mm or more, and the drawing when the drawing height is 17.5 mm or more and less than 20 mm. The case where the height is 15 mm or more and less than 17.5 mm is indicated by Δ, and the case where the height of the drawing is 15 mm or less is indicated by ×. The obtained results are shown in Table 4 (Examples) and Table 5 (Comparative Examples).

<Low temperature property confirmation test>
As an index of property stability at low temperatures, the pour point of each test oil was measured according to JIS standard K2269.3 (pour point test method).

  Evaluation criteria for low-temperature properties are low-temperature properties (excellent) when the pour point is −2.5 ° C. or lower, ○ when the pour point is 0 ° C., Δ when the pour point is 2.5 ° C., pour point X exceeding 2.5 ° C. was rated as x. The obtained results are shown in Table 4 (Examples) and Table 5 (Comparative Examples).

<Degreasing test>
Using aluminum alloy sheet (A5182-O) test piece shape (1.0 mm x 70 mm x 100 mm) as a test piece, apply 2 g / m ² of test oil to the surface of each test piece using a rubber roller. A test piece was prepared. Each of these specimens was suspended vertically in a constant temperature and humidity test box (temperature: 50 ° C., humidity: 95%), left for 240 hours, and then subjected to a degreasing test. In the degreasing test, Fine Cleaner E2001 (manufactured by Nihon Parkerizing Co., Ltd.) is adopted as a degreasing agent, a 2% by mass aqueous solution of the degreasing agent is adjusted to 40 ° C., and the specimen is immersed in the aqueous solution. The aqueous solution was left for 2 minutes with stirring. After the immersion, the specimen was washed with running water for 30 seconds, and the degreased state of the specimen after washing was observed.

  The evaluation standard for the degreasing state is the water wetted area (%) of each specimen after washing, and the wetted area of the specimen after washing with water is 90% or more. Is 80 or less and less than 90%, a water wetted area is 70 or more and less than 80%, and a water wetted area is less than 70%. The obtained results are shown in Table 4 (Examples) and Table 5 (Comparative Examples).

As shown in Table 4 and Table 5, since Comparative Example 1 does not contain a monoester, the moldability is insufficient, and Comparative Example 2 is inferior in degreasing property because the amount of the monoester is too large. Since Comparative Example 3 does not contain oxo alcohol, moldability is insufficient, and Comparative Example 4 has a problem in low-temperature properties and degreasing properties because the amount of oxo alcohol is too large. Since Comparative Example 5 uses an inappropriate monoester, the moldability is insufficient. Comparative Example 6 has a problem in moldability because oxo alcohol has too few carbon atoms, and Comparative Example 7 has a problem in low temperature properties because of too many carbon atoms. Since Comparative Examples 8 and 9 do not use oxo alcohol, there are problems with low temperature properties and moldability. In Comparative Example 10, the amount of the pour point depressing component is too large and the acid value is high, so there is a problem in degreasing properties. In Comparative Example 11, the pour point depressing component is inappropriate, and thus the degreasing properties and low temperature properties are adversely affected. Is exerting. Comparative Example 12 has a problem in degreasing properties because the amount of the rust preventive component is too large and the base number is high.
On the other hand, Examples 1 to 9 show excellent moldability, low-temperature properties, and degreasing properties because the components to be blended and their amounts, particularly the components and blending amounts of the monoester and oxo alcohol as the main components are appropriate.

FIG. 1 is a flowchart showing a press forming method of an aluminum alloy plate according to the present invention. FIG. 2 is a flowchart showing another aluminum alloy sheet press forming method according to the present invention.

Claims (7)

One or more selected from mineral oil or synthetic oil is used as a base oil,
The following general formula (1)

(In the formula, either one of R ₁ and R ₂ is a linear saturated hydrocarbon chain having 13 or more carbon atoms, R ₁ having 21 or less carbon atoms, and R ₂ having 18 or less carbon atoms, and the other is 1 or more carbon atoms, R ₁ carbon number of 7 or less, R ₂ carbon number of 8 or less, straight chain or 3 or more carbon atoms, R ₁ carbon number of 17 or less, R ₂ carbon number of 18 or less Branch branched saturated hydrocarbon chain.)
10 to 50% by mass of one or more selected from monoesters represented by:
5 to 40% by mass of one or more selected from oxo alcohols having 11 to 17 carbon atoms;
A lubricating composition for aluminum alloy sheet materials, comprising: The oxo alcohol is an oxo alcohol produced by an oxo method using a linear α-olefin having 10 to 16 carbon atoms as a raw material, and the following general formula (2)

(Wherein R ₃ is a linear saturated hydrocarbon chain having 11 to 17 carbon atoms);
The following general formula (3)

(In the formula, R ₄ is a linear saturated hydrocarbon chain having 8 to 14 carbon atoms.)
The lubricating composition for an aluminum alloy sheet according to claim 1, which is a mixture with an alcohol represented by the formula:   The ratio of the mixture of the alcohols is in the range of 1: 9 to 9: 1 by mass ratio of the general formula (2): general formula (3), The aluminum alloy plate material lubrication according to claim 2, Composition.   The aluminum alloy sheet material according to any one of claims 1 to 3, further comprising 0.1 to 10% by mass of one or more selected from polyhydric alcohol esters of lanolin fatty acid. Lubricating composition.   The lubricating composition for aluminum alloy sheets according to any one of claims 1 to 4, wherein the lubricating composition for aluminum alloy sheets has an acid value of 1.5 mgKOH / g or less and a base value of 4 mgKOH / g or less. Lubricating composition for aluminum alloy sheet. Aluminum alloy plate Aluminum alloy sheet lubricating composition according to claim 1 to 5, characterized in that it is applied ^{0.2g / m 2 ~5g / m 2} .   A press forming method of an aluminum alloy plate material, wherein the aluminum alloy plate according to claim 6 is used for press forming.

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