JPH05255679A - Lubricated aluminum or aluminum alloy material - Google Patents

Abstract

PURPOSE:To obtain the subject alloy material containing specified lubricant on the material surface, low in friction between the material and a working tool in molding and capable of readily defatting after molding. CONSTITUTION:The objective aluminum or aluminum alloy plate coated with a lubricant composed of (A) 10 to 95wt.% ester (e.g. laury caprate or cetyl caprate) of formula I (n is 7 to 21; m is 4 to 21) between a saturated fatty acid and a higher alcohol and (B) 5 to 90wt.% alkoxyalkyl ester (e.g. 2- methoxyethyl caprate or 2-methoxyethyl palmitate) of formula II (x is 7 to 23; y is >=1; z is >=1) applied to the surface by using a roll coater, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricated aluminum or aluminum alloy material for facilitating molding when molding automobile parts or home electric appliance parts.

[0002]

2. Description of the Related Art Conventionally, steel sheets have been used as body materials for automobiles and the like, but in recent years, there has been a strong demand for weight reduction of vehicles for energy saving from the standpoint of global environmental protection. Along with this, automobile manufacturers have begun to use aluminum (alloy) for their parts, and have also adopted aluminum (alloy) for body panel materials.

In the case of making a part using a steel plate from an aluminum alloy plate, an aluminum alloy having strength similar to steel is generally inferior in ductility to steel, and deep drawability is worse than steel. The problem is that the formability of the sheet is inferior to that of the sheet.

[0004]

One way to solve this problem is to reduce the friction between the plate and the tool during forming.

Various lubricating oils have been studied in order to improve the formability of aluminum alloys. Generally, lubricating oils having excellent formability have poor degreasing properties and often adversely affect the zinc phosphate treatment in the subsequent step. .. On the contrary, a lubricating oil having excellent degreasing property has a problem in lubricity.

Therefore, an object of the present invention is to provide an aluminum or aluminum alloy material which has a low friction between a plate and a tool at the time of molding and which is coated with a lubricant which can be easily degreased after molding.

[0007]

Means for Solving the Problems The gist of the present invention is to provide an ester of a saturated fatty acid represented by the following formula (1) with a higher alcohol in an amount of 10 to 95 wt% and an alkoxy represented by the following formula (2) on the surface of a material. A lubricated aluminum or aluminum alloy material having a lubricant consisting of 5-90 wt% of an alkyl ester.

C _n H _{2n + 1} COOC _m H _{2m + 1} (1) (where n is 7 to 21 and m is 4 to 21 in the formula (1)) C _X H _{2X + 1} COO (C ₂ H the _{4 O) Y C Z H 2Z} + 1 (2) ( equation (2) medium X 7 to 23, Y is 1 or more, Z represents.) then one or more, it will be described material constituting the surface.

The lubrication film in the present invention is a film in which an ester of saturated fatty acid and higher alcohol and an alkoxyalkyl ester are mainly mixed and coated on the surface of the material. In addition to these, additives can be used if necessary. Regarding the coating method, a conventionally known roll roll
A tar or electrostatic coating device is used.

Next, the action and effect of the ester of the saturated fatty acid and the higher alcohol and the alkoxyalkyl ester in the lubricating film will be described.

Ester of Saturated Fatty Acid and Higher Alcohol The ester of saturated fatty acid and higher alcohol has the function of an oiliness agent because the ester group has a large chemical adsorption force on the surface of the aluminum alloy.

When the content is less than 10 wt%, the lubricity becomes insufficient, and when it exceeds 95 wt%, the content of the alkoxyalkyl ester described below becomes small, so that the lubricity deteriorates and the degreasing property decreases at the same time.

In the formula (1), when n is less than 7 or m is less than 4, lubricity is insufficient, and when n exceeds 21 or m exceeds 21, the melting point is high and it is difficult to use.

Examples of the fatty acid ester represented by the formula (1) include lauryl caprylate, cetyl caprylate,
Stearyl caprylate, behenyl caprylate, lauryl caprate, cetyl caprate, stearyl caprate, behenyl caprate, lauryl laurate, cetyl laurate, stearyl laurate, behenyl laurate, lauryl palmitate, cetyl palmitate, palmitate Stearyl, behenyl palmitate, lauryl stearate, cetyl stearate, stearyl stearate, behenyl stearate, lauryl behenate,
Examples thereof include cetyl behenate, stearyl behenate, and behenyl behenate. The hydrocarbon groups of the acid component and alcohol component forming the above fatty acid ester are
It may be a straight chain hydrocarbon or a hydrocarbon having a side chain.

Alkoxyalkyl ester The alkoxyalkyl ester functions as an excellent oiliness agent, has self-emulsifying property, and contributes to improvement of degreasing property.

If the content is less than 5 wt%, the degreasing property is insufficient,
If it exceeds 90% by weight, the content of fatty acid ester decreases and the lubricity becomes insufficient.

Examples of the alkoxyalkyl ester represented by the formula (2) include 2-methoxyethyl caprate,
2-butoxyethyl caprate, 2-heptadecanoxyethyl caprate, 2-methoxyethyl palmitate,
2-Butoxyethyl palmitate, 2-Heptadecanoxyethyl palmitate, 2-Methoxyethyl stearate, 2-Butoxyethyl stearate, Stearic acid 2
-Heptadecanoxyethyl, 5 mol adduct of methyl ethylene oxide caprate, 5 mol adduct of butyl ethylene oxide caprate, 5 mol adduct of heptadecane ethylene oxide caprate, 5 mol adduct of methyl ethylene oxide palmitate, palmitic acid Butyl ethylene oxide 5 mol adduct, palmitic acid heptadecane ethylene oxide 5 mol adduct, stearic acid methyl ethylene oxide 5 mol adduct, stearic acid butyl ethylene oxide 5 mol adduct, stearate heptadecane ethylene oxide 5 mol adduct, 20 mol adduct of methyl ethylene oxide caprate, 20 mol adduct of butyl ethylene oxide caprate, 20 mol adduct of captaic acid heptadecane ethylene oxide, methyl ethyl palmitate 20 mol adduct of butyl ethylene oxide, 20 mol adduct of butyl ethylene oxide palmitate, 20 mol adduct of heptadecane ethylene oxide palmitate, 20 mol adduct of methyl ethylene oxide stearate, 20 mol adduct of butyl ethylene oxide stearate, stearic acid 20 mol of heptadecane ethylene oxide adduct, the hydrocarbon group of the acid and alcohol of the alkoxyalkyl ester is a straight chain hydrocarbon,
It may be a hydrocarbon having a side chain.

The alkoxyalkyl esters used in the lubricant of the present invention may be the above-mentioned ones alone or in combination,
Either is fine.

When the X value in the formula (2) is smaller than the lower limit, the lubricity is poor, and when the X value is larger than the upper limit, the melting point is high and it is difficult to use. Further, Y is preferably 1 to 5 and Z is preferably 4 to 10.

Amount of lubricant applied Rolling coater on aluminum or aluminum alloy plate
The friction decreases as the amount of the lubricant applied by the electrostatic coating device or the dipping method to the friction surface increases, but in that case, the degreasing property tends to deteriorate. The lubricity and degreasing property can be further improved by chemically etching the surface of the aluminum material prior to applying the lubricant.

Since the lubricant of the present invention exhibits stable lubricity even in a thin film, a coating amount of 300 to 500 mg / m ² is sufficient and good results are obtained.

[0022]

[Example] JI with a plate thickness of 1 mm, a width of 10 mm, and a length of 200 mm as a plate material
S 5182 Aluminum alloy plate with lubricant 250, 500, 1000
mg / m ^{2 was} applied, the test device shown in FIG. 1 was set on a crank press with a die cushion, the die 2 was pushed down, and a plate pressing force H was applied to the material 1 by the die 2 and the plate pressing 3 (see FIG. )). Then, arc punching is performed by the punch 4 (FIG. 1B). Processing force P acting on the punch 4
And the sum (H + P) of the working force P acting on the die 2 and the plate pressing force is measured by a load cell to obtain the chart illustrated in FIG. 2, and the plate pressing force at the bottom dead center is obtained from this chart. H
And read the processing force P. The same test is performed by changing the air pressure of the die cushion, and the relationship between the plate pressing force H and the processing force P is obtained as shown in FIG. Then, the gradient μ in FIG. 3 was defined as a friction coefficient, and the lubricity of the lubricant was evaluated.

The degreasing property was evaluated by degreasing the plate coated with the lubricant in a liquid of 2% sodium orthosilicate at a bath temperature of 50 ° C. for 2 minutes, followed by washing with water, and the wetted area of the plate surface after washing with water. It was evaluated according to the size. And the coefficient of friction is 0.15
Less than 90% of the wetted area was taken as an invention example. Further, the component analysis method of the lubricating coating, the molecular weight and addition amount of the fatty acid ester of the above formula (1), the molecular structure and addition amount of the alkoxyalkyl ester gas chromatography, infrared spectrophotometry, gas chromatogram-mass spectrometry (GC-MS),
Gas chromatogram-infrared spectrophotometry (GC-FTI
R) can be quantified. The results are shown in Table 1.

[0024]

[Table 1]

Inventive examples Nos. 1 to 15 all have a friction coefficient of 0.
When it was 12 or less, the wetted area after degreasing was 90% or more, which showed good degreasing property.

However, Comparative Example No. 16 has a low carbon number in the acid component of the fatty acid ester formula (1), so that the lubricity decreases,
The coefficient of friction increased to 0.17.

In Comparative Example No. 17, the acid component of the fatty acid ester formula (1) had a large carbon number of 23, so that the degreasing property was low.

Comparative Example No. 18 is a fatty acid ester formula (1)
Since the number of carbon atoms in the alcohol component of was low, the coefficient of friction was high. On the contrary, Comparative Example No. 19 had a large number of carbon atoms and thus had a poor degreasing property.

No. 20 of the comparative example had a large friction coefficient because the acid component of the alkoxyalkyl ester formula (2) had a small number of carbon atoms, and No. 21 had a large number of carbon atoms and had a poor degreasing property. Further, No. 22 had a large friction due to the small addition amount of the fatty acid ester formula (1), and No. 23, on the contrary, had a large depletion property due to the large addition amount.

[0030]

As described above, the aluminum alloy sheet coated with the specific fatty acid ester and the alkoxyalkyl ester of the present invention has excellent lubricity and degreasing property, and can be molded when molding automobile parts or home electric appliance parts. Can be facilitated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a test apparatus for evaluating lubricity.

2 is an example of a chart obtained using the test apparatus of FIG.

FIG. 3 is a diagram showing a relationship between a plate pressing force H and a processing force P.

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Claims (1)

[Claims] 1. An ester of a saturated fatty acid represented by the following formula (1) and a higher alcohol on the surface of the material: 10 to 95 wt%, the following formula:
A lubricated aluminum or aluminum alloy material having a lubricant consisting of 5 to 90 wt% of an alkoxyalkyl ester represented by (2). C _n H _{2n + 1} COOC _m H _{2m + 1} (1) (wherein n represents 7 to 21 and m represents 4 to 21 in the formula (1)) C _X H _{2X + 1} COO (C ₂ H ₄ O) _Y C _Z H _{2Z + 1} (2) (in the formula (2), X represents 7 to 23, Y represents 1 or more, and Z represents 1 or more.)