JP4741816B2 - Cold rolling lubricant - Google Patents

Description

  The present invention relates to a lubricating oil used for cold rolling of aluminum.

  Conventionally, in aluminum rolling, for the purpose of reducing friction between a rolling roll of a rolling mill and aluminum to ensure lubricity and preventing scratches on aluminum products such as aluminum plates after rolling. A lubricating oil for rolling is used. As such a lubricating oil, in general, a mineral oil having a viscosity of several cSt as a base oil and containing an oily agent such as a higher alcohol has been used. Further, when lubricity of the lubricating oil is particularly required, a lubricating oil added with a small amount of higher fatty acid such as oleic acid has been used.

In recent years, in aluminum products such as aluminum plates, demands for high productivity and high quality have become increasingly severe. Therefore, in order to meet the demand for productivity, high-speed rolling and high-pressure rolling have been implemented in aluminum rolling.

However, when high-speed rolling or high-pressure rolling is performed, an aluminum adhesion layer called roll coating is easily formed on the surface of the rolling roll of the rolling mill. Depending on the amount and properties of this roll coating, the rollability and the surface quality of the aluminum after rolling may be adversely affected. In particular, when high-speed rolling is performed using a rolled material of high-purity aluminum having a purity of 99.9% or more, the roll coating tends to be thick. As a result, a phenomenon called plate thickness hunting that the thickness of the aluminum plate fluctuates at a pitch of several millimeters easily occurs. Further, when roll coating occurs, a vibration load is also generated on the rolling mill itself. As a result, there was a problem that eventually it was forced to return to low speed rolling, and high productivity could not be achieved.

In order to avoid such a problem, the amount of higher alcohol in the lubricating oil is increased or a fatty acid such as oleic acid is added. However, in this case, there is a problem that the odor of the lubricating oil becomes intense and the working environment is deteriorated. In addition, the addition of fatty acids has the problem of forming a fatty acid soap that contaminates the surface of the aluminum product. Furthermore, when annealing or the like is performed after rolling, there is a problem that defects such as black seizure called oil stain are likely to occur. There is also a problem of increasing aluminum wear powder in the lubricating oil.
Accordingly, various lubricating oils have been developed to deal with such problems (see Patent Documents 1 to 6). By using these lubricating oils, roll coating with high purity aluminum can be suppressed.

  However, when the lubricating oils disclosed in Patent Documents 1 to 6 are used for industrial pure aluminum or aluminum alloy having a purity of less than 99.9%, such as so-called 1000 series aluminum, there is a problem that rolling lubricity deteriorates. There is. Generally, industrially, a rolling mill contains a single type of lubricating oil in a single tank and uses this single type of lubricating oil to roll multi-material aluminum. If it cannot be used for industrial pure aluminum or aluminum alloy, it cannot be used industrially.

JP 2001-329287 A JP 2000-119679 A JP 2000-80390 A JP 2000-80389 A JP 2000-8068 A JP-A-10-338894

The present invention has been made in view of such conventional problems, and can be used for rolling high purity aluminum, industrial pure aluminum and aluminum alloys, and has excellent lubricity even in high- speed rolling and high-pressure rolling. It is intended to provide a cold-rolled lubricating oil that can exhibit the above-described properties and can suppress the occurrence of roll coating.

The present invention is a lubricating oil used for cold rolling of aluminum,
The lubricating oil comprises an oily agent, an amine derivative, and a base oil,
The oily agent comprises 0.1 to 15 parts by weight of a higher alcohol comprising lauryl alcohol and / or oleyl alcohol , 0.01 to 3 parts by weight of a higher fatty acid having 12 to 18 carbon atoms, and a higher fatty acid ester having 13 to 22 carbon atoms. It consists of one or more selected from 0.1 to 15 parts by weight, the total amount is 0.01 to 33 parts by weight,
The amine derivative has 4 to 20 carbon atoms and is one or more selected from aliphatic amines, alkanolamines, aliphatic polyamines, aromatic amines, alicyclic amines, heterocyclic amines, and alkylene oxide adducts thereof. The total amount is 0.01 to 5 parts by weight,
The said base oil consists of 1 or more types chosen from polyisobutylene, a C12-C18 alpha olefin, and mineral oil, The total amount is 99.98-62 weight part, Cold rolling characterized by the above-mentioned It exists in lubricating oil (Claim 1).

The cold rolling lubricating oil of the present invention contains a specific oily agent, an amine derivative, and a base oil as described above.
Therefore, the cold rolling lubricating oil can be used not only for high pure aluminum but also for cold rolling of industrial pure aluminum and aluminum alloys, and exhibits excellent rolling lubricity for any material. be able to. In the present invention, high purity aluminum, industrial pure aluminum and aluminum alloy are collectively referred to as “aluminum” as appropriate hereinafter.

In addition, the cold rolling lubricating oil can suppress the occurrence of roll coating (aluminum adhesion layer) on the surface of the rolling roll of the cold rolling mill, and enables high-speed rolling and rolling under high pressure of aluminum. become.
Furthermore, in the cold lubricating oil, generation of by-products such as metal soap is suppressed. Therefore, it is possible to suppress the occurrence of contamination and oil stain in the aluminum product after rolling such as an aluminum plate. Therefore, when the cold-rolled lubricating oil is used for aluminum rolling, an aluminum product having excellent surface quality can be produced.

Thus, according to the present invention, it can be used for rolling high purity aluminum, industrial pure aluminum, and aluminum alloys, and can exhibit excellent lubricity even in high- speed rolling and high-pressure rolling, and can generate roll coating. It is possible to provide a cold-rolled lubricating oil that can suppress the above.

Next, embodiments of the present invention will be described.
The cold rolling lubricating oil of the present invention (Claim 1) contains the oil agent, the amine derivative, and the base oil.
First, the said oiliness agent is demonstrated.
The cold rolling lubricating oil contains 0.01 to 33 parts by weight of the oily agent, and the oily agent is 0.1 to 15 parts by weight of a higher alcohol having 11 to 15 carbon atoms and a higher oil having 12 to 18 carbon atoms. It comprises at least one selected from 0.01 to 3 parts by weight of a fatty acid and 0.1 to 15 parts by weight of a higher fatty acid ester having 13 to 22 carbon atoms.

  When the content of the higher alcohol is less than 0.1 parts by weight, boundary lubricity, that is, the oil agent having a polar group is chemically or physically adsorbed on the surface of the rolling roll or the surface of the material to be rolled, and the adsorbed film There is a risk that the lubricity through the steel will deteriorate, seizure will occur during rolling, and the surface of the aluminum product such as the aluminum plate after rolling may be damaged. On the other hand, even if the content of the higher alcohol exceeds 15 parts by weight, the properties of the cold-rolled lubricating oil are not improved. Therefore, in this case, there is a problem that the cost is increased. The content of the higher alcohol is more preferably 3 to 10 parts by weight in consideration of the working environment, rolling lubricity, cost, and the like.

  Moreover, when the carbon number of the higher alcohol is less than 11, the cold rolling lubricating oil has a strong odor and may deteriorate the working environment. Furthermore, in this case, the boundary lubricity deteriorates, seizure occurs during rolling, and the surface of the aluminum product may be damaged. On the other hand, when the number of carbon atoms exceeds 15, the cold-rolled lubricating oil tends to solidify in a low temperature environment such as winter or in a cold region, which may make handling difficult.

Moreover, it is preferable that the said higher alcohol consists of alcohol represented by following General formula (1) .
R1-OH (1)
(R1 is an alkyl group having 11 to 15 carbon atoms.)
The reason why the carbon number of R1 is 11 to 15 is the same as the reason why the carbon number of the higher alcohol is limited to the range of 11 to 15.
Specific examples of the alcohol represented by the general formula (1) include lauryl alcohol, myristyl alcohol, palmitic alcohol, oleyl alcohol, stearyl alcohol and the like. Any one of these may be used, but two or more may be mixed and used. More preferred is lauryl alcohol and / or oleyl alcohol.

  Next, when the content of the higher fatty acid is less than 0.01 parts by weight, boundary lubricity deteriorates, seizure occurs during rolling, and scratches occur on the surface of an aluminum product such as an aluminum plate after rolling. There is a fear. On the other hand, when the content of the higher fatty acid exceeds 3 parts by weight, there is a possibility that oil stain is likely to occur when the rolled aluminum product is annealed. Further, metal soap is generated in the rolling lubricating oil, which may deteriorate the quality of the surface of the aluminum product.

  Further, when the higher fatty acid has less than 12 carbon atoms, the boundary lubricity of the cold rolling lubricating oil may be deteriorated. On the other hand, when the number of carbon atoms exceeds 18, the cold-rolled lubricating oil is likely to solidify in a low temperature environment such as in winter or in a cold region, which may make handling difficult.

The higher fatty acid is preferably composed of a fatty acid represented by the following general formula (2) (Claim 3).
R2-COOH (2)
(R2 is an alkyl or alkenyl group having 11 to 17 carbon atoms.)
In the general formula (2), the reason why the carbon number of R2 is 11 to 17 is the same as the reason for limiting the carbon number of the higher fatty acid to a range of 12 to 18. That is, when the carbon number of R2 in the above general formula (2) is less than 11, the boundary lubricity may be deteriorated, and when it exceeds 17, it is likely to solidify in a low temperature environment.

Specific examples of the fatty acid represented by the general formula (2) include direct acids such as capric acid, undecanoic acid, lauric acid, tridecanoic acid, demisteric acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, and behenic acid. There are chain saturated acids and unsaturated fatty acids such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, and ricinoleic acid. Any one of these may be used, but two or more may be mixed and used.
More preferably, lauric acid, myristic acid, palmitic acid, oleic acid and the like are preferable.
In this case, the lubricity and long-term stability of the cold-rolled lubricating oil can be further improved. Furthermore, it can be made more difficult to solidify in a low temperature environment, and the handling of the cold rolling lubricating oil can be made easier.

  Next, when the content of the higher fatty acid ester is less than 0.1 parts by weight, boundary lubricity deteriorates, seizure occurs during rolling, and the surface of the aluminum product such as an aluminum plate after rolling is scratched. May occur. On the other hand, when the content of the higher fatty acid ester exceeds 15 parts by weight, there is a risk that oil stain is likely to occur when the rolled aluminum product is annealed.

  Further, when the higher fatty acid ester has less than 13 carbon atoms, the lubricity of the cold-rolled lubricating oil may be deteriorated or roll coating may easily occur. In addition, the cold rolling lubricating oil becomes odorous and the working environment may be deteriorated. On the other hand, when the number of carbon atoms exceeds 22, there is a possibility that oil stains are likely to be generated by annealing in a subsequent process because it remains in an aluminum product such as an aluminum plate after rolling. In this case, since the melting point of the cold-rolled lubricating oil is high, the cold-rolled lubricating oil is likely to solidify at room temperature, and when using the cold-rolled lubricating oil, there may be a need for a heating facility for heating the cold-rolled lubricating oil. is there.

Moreover, it is preferable that the said higher fatty acid ester consists of fatty acid ester represented by following General formula (3) (Claim 4).
R3-COO-R4 (3)
(R3 is an alkyl group or alkenyl group having 11 to 17 carbon atoms, and R4 is an alkyl group having 1 to 4 carbon atoms.)
In the general formula (3), when the number of carbon atoms in R3 is less than 11, the lubricity of the cold-rolled lubricating oil may be deteriorated or roll coating may easily occur. In addition, the cold rolling lubricating oil becomes odorous and the working environment may be deteriorated. On the other hand, when the carbon number of R3 in the general formula (3) exceeds 17, or when the carbon number of R4 exceeds 4, it remains in the aluminum product such as an aluminum plate after rolling, and is annealed in a post process. Oil stain is likely to occur. In this case, since the cold rolling lubricating oil has a high melting point, it tends to solidify at room temperature, and there is a possibility that heating equipment for heating the cold rolling lubricating oil may be required.

  Specific examples of the fatty acid ester represented by the general formula (3) include, for example, methyl caprylate, ethyl caprylate, propyl caprylate, butyl caprylate, methyl pelargonate, ethyl pelargonate, propyl pelargonate, and butyl pelargonate. , Methyl caprate, ethyl caprate, propyl caprate, butyl caprate, methyl laurate, ethyl laurate, propyl laurate, butyl laurate, methyl myristate, ethyl myristate, propyl myristate, butyl myristate, palmitic Methyl acid, ethyl palmitate, propyl palmitate, butyl palmitate, methyl stearate, ethyl stearate, propyl stearate, butyl stearate, methyl oleate, ethyl oleate, propylene oleate , And butyl oleate. Any one of these may be used, but two or more may be mixed and used.

Next, the amine derivative will be described.
The cold rolling lubricating oil contains 0.01 to 5 parts by weight of the amine derivative.
When the content of the amine derivative is less than 0.01 parts by weight, roll coating may easily occur. On the other hand, when the amount exceeds 5 parts by weight, the amine becomes excessive and the amine derivative adsorbs to the metal faster than the oily agent, which may inhibit the effect of the oily agent. As a result, the rolling lubricity of the cold rolling lubricating oil may be reduced. More preferably, the amount is 0.1 to 1 part by weight.

The said amine derivative consists of 1 or more types chosen from an aliphatic amine, an alkanolamine, an aliphatic polyamine, an aromatic amine, an alicyclic amine, a heterocyclic amine, and those alkylene oxide adducts. Moreover, these amine derivatives can contain a hydroxyl group, an ether group, and the like.
Examples of the polymerization form of the added alkylene oxide include homopolymerization of one type of alkylene oxide, random copolymerization of two or more types of alkylene oxide, block copolymerization, and random / block copolymerization.
In the alkylene oxide adduct, the number of moles of alkylene oxide added is preferably 1 to 6 moles per mole of amines. When it exceeds 6 mol, there exists a possibility that the solubility to a base oil may fall.

Specific examples of the amine derivative include the following.
That is, as the aliphatic amine, for example, methylamine, ethylamine, butylamine, caprylamine, laurylamine, stearylamine, oleylamine, beef tallow amine, dimethylamine, diethylamine, dioctylamine, butyloctylamine, distearylamine, dimethyloctylamine, Examples include dimethyldecylamine, dimethyllaurylamine, dimethylmyristylamine, dimethylpalmitylamine, dimethylstearylamine, dimethylbehenylamine, dilaurylmonomethylamine, and trioctylamine.

  Examples of the alkanolamine include monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N, N-dimethylethanolamine, N-ethylethanolamine, N, N-diethylethanolamine, N-isopropylethanolamine, N , N-diisopropylethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N-methylisopropanolamine, N, N-dimethylisopropanolamine, N-ethylisopropanolamine, N, N-diethylisopropanolamine, N-isopropyl Isopropanolamine, N, N-diisopropylisopropanolamine, mono-n-propanolamine, di-n-propanolamine, tri-n Propanolamine, N-methyl n-propanolamine, N, N-dimethyl n-propanolamine, N-ethyl n-propanolamine, N, N-diethyl n-propanolamine, N-isopropyl n-propanolamine, N, N -Diisopropyl n-propanolamine, monobutanolamine, dibutanolamine, tributanolamine, N-methylbutanolamine, N, N-dimethylbutanolamine, N-ethylbutanolamine, N, N-diethylbutanolamine, N-isopropyl Examples include butanolamine and N, N-diisopropylbutanolamine.

Examples of the aliphatic polyamine include ethylenediamine, diethylenetriamine, triethylenetetraamine, hexamethylenediamine, and cured beef tallow propylenediamine.
Examples of the aromatic amine include aniline, dimethylaniline, and diethylaniline.
Examples of alicyclic amines include N-cyclohexylamine, N, N-dicyclohexylamine, N, N-dimethyl-cyclohexylamine, N, N-diethyl-cyclohexylamine, and N, N-di (3-methyl-cyclohexyl). Examples include amines, N, N-di (2-methoxy-cyclohexyl) amine, N, N-di (4-bromo-cyclohexyl) amine and the like.

  Examples of the heterocyclic amine include pyrrolidine, piperidine, 2-pipecoline, 3-pipecoline, 4-pipecoline, 2,4-pipecoline, 2,6-pipecoline, 3,5-lupetidine, piperazine, homopiperazine, and N-methylpiperazine. N-ethylpiperazine, N-propylpiperazine, N-methylhomopiperazine, N-acetylpiperazine, N-acetylhomopiperazine, 1- (chlorophenyl) piperazine, N-aminoethylpiperidine, N-aminopropylpiperidine, N-amino Ethyl piperazine, N-aminopropyl piperazine, N-aminoethyl morpholine, N-aminopropyl morpholine, N-aminopropyl-2-pipecholine, N-aminopropyl-4-pipecholine, 1,4-bis (aminopropyl) piperazine, etc. There is.

  The amine derivative preferably has a hydrocarbon group having 4 or more carbon atoms having a branched chain from the viewpoint of solubility in oil. Moreover, when the total carbon number of the said amine derivative exceeds 20, there exists a possibility that an oil stain may become easy to generate | occur | produce by the annealing etc. which are performed after the rolling of aluminum.

Next, the base oil will be described.
The cold-rolled lubricating oil contains 99.98 to 62 parts by weight of the base oil.
When the content of the base oil exceeds 99.98, the amount of the oily agent and the amine derivative in the cold rolling lubricating oil is relatively small. Therefore, boundary lubricity is lowered, seizure occurs, and the surface of an aluminum product such as an aluminum plate after rolling may be damaged. In this case, roll coating may easily occur.
On the other hand, when the amount is less than 62 parts by weight, oil stain may be easily generated when the rolled aluminum product is annealed. Moreover, there exists a possibility that rolling lubricity may fall.

The said base oil consists of 1 or more types chosen from polyisobutylene, a C12-C18 alpha olefin, and mineral oil.
As the mineral oil, paraffinic and / or naphthenic mineral oils can be used.
From the viewpoint of environmental protection, a mineral oil having an aroma component content of 2% or less is preferred.

The α-olefin is easily chemically adsorbed on the surface of aluminum during rolling and has a function as an oily agent.
When the α-olefin has less than 12 carbon atoms, the boundary lubricity of the cold rolling lubricating oil may be deteriorated. On the other hand, when the number of carbon atoms exceeds 18, the cold-rolled lubricating oil is likely to solidify in a low temperature environment such as in winter or in a cold region, which may make handling difficult.
In addition, since the α-olefin as the base oil has a relatively low viscosity, it can be suitably used, for example, when strict rolling lubricity is required and oil pits are disliked.

The α-olefin as the base oil is preferably composed of one or more selected from 1-dodecene, 1-tetracene, 1-hexadecene and 1-octadecene.
In this case, the lubricity of the cold rolling lubricating oil can be further improved. Particularly preferred is a mixture in which 1-hexadecene and 1-octadecene are mixed in approximately equal amounts.

Polyisobutylene has a relatively high high-pressure viscosity. Therefore, the cold rolling lubricating oil containing polyisobutylene as a base oil has an amount of oil introduced into a roll bite, that is, an amount of oil introduced between a rolling roll of a rolling mill and an aluminum material as a material to be rolled. Easy to increase. The polyisobutylene has a characteristic that it is easily pyrolyzed. Therefore, cold-rolled lubricating oil containing polyisobutylene as a base oil hardly generates oil stain.
Therefore, the polyisobutylene can be suitably used when severe rolling lubricity is required and generation of oil stains is a concern.

（ｎは１以上の自然数） The polyisobutylene as the base oil is preferably represented by the following formula (4) and has a viscosity of 5 to 20 mm ² / s at a temperature of 40 ° C. (Claim 6).

(N is a natural number of 1 or more)

In this case, the lubricity of the cold rolling lubricating oil can be further improved. Moreover, when the viscosity of polyisobutylene exceeds 20 mm < ² > / s, there exists a possibility that handling may become difficult. On the other hand, the polyisobutylene having a molecular weight of less than 5 mm ² / s is difficult to obtain. This is because industrially commercially available polyisobutylene has a viscosity of 5 mm ² / s or more.

（ｎは１以上の自然数） The polyisobutylene represented by the above formula (4) can be hydrogenated (claim 7).
The hydrogenated polyisobutylene is represented by the following formula (5).

(N is a natural number of 1 or more)

The cold-rolled lubricating oil preferably has a viscosity of 1 to ²⁰ mm ² / s .
When the viscosity is less than 1 mm ² / s, the amount of the cold rolling lubricating oil supplied to the roll bite during rolling is reduced, which may cause lubrication failure and deteriorate the surface quality of the aluminum product after rolling. is there. On the other hand, if it exceeds 20 mm ² / s, slip may occur between the roll of the rolling mill and the aluminum material during rolling, and oil pits are likely to occur, and oil stains are likely to occur after rolling. There is. More preferably, 1.2-6.0 mm < ² > / s is good.
The viscosity of the cold-rolled lubricating oil can be determined by the blending ratio of the base oil and the oily agent or amine derivative added to the base oil.

Moreover, the said cold rolling lubricating oil can contain another additive other than the said oiliness agent, an amine derivative, and base oil, unless the effect of this invention is impaired. Specifically, the additive is preferably 5 parts by weight or less with respect to 100 parts by weight of the total amount of the oily agent, the amine derivative and the base oil.
Examples of such additives include antioxidants, rust inhibitors, corrosion inhibitors, and antifoaming agents. Antioxidants include phenolic compounds such as DBPC (2,6-ditertiarybutyl-P-cresol), aromatic amines such as phenyl-α-naphthylamine, partial esters of polyhydric alcohols such as sorbitan monooleate, phosphorus Acid esters and derivatives thereof. As the corrosion inhibitor, for example, benzotriazole can be used, and as the antifoaming agent, a silicon-based one can be used.

Example 1
Next, examples of the present invention will be described.
In this example, a plurality of cold-rolled lubricating oils having different compositions were prepared, and their characteristics were examined.
The cold rolling lubricating oil of this example is a lubricating oil used for cold rolling of aluminum. The lubricating oil comprises 0.01 to 33 parts by weight of an oily agent, 0.01 to 5 parts by weight of an amine derivative, and 99.98 to 62 parts by weight of a base oil. The oily agent comprises 0.1 to 15 parts by weight of a higher alcohol having 11 to 15 carbon atoms, 0.01 to 3 parts by weight of a higher fatty acid having 12 to 18 carbon atoms, and 0.1 to 0.1 part by weight of a higher fatty acid ester having 13 to 22 carbon atoms. It consists of 1 or more types chosen from 15 weight part. The amine derivative is composed of one or more selected from aliphatic amines, alkanolamines, aliphatic polyamines, aromatic amines, alicyclic amines, heterocyclic amines, and alkylene oxide adducts thereof. A base oil consists of 1 or more types chosen from polyisobutylene, a C12-C18 alpha olefin, and mineral oil.

In this example, as shown in Table 1 described later, a plurality of cold-rolled lubricating oils (samples E1 to E15) having different types and amounts of oiliness agent, amine derivative, and base oil were prepared.
As the base oil, the following three kinds of base oils A to C were used.
(Base oil)
Base oil A: Mineral oil with a viscosity of 4.09 mm ² / s at a temperature of 40 ° C. (paraffin 30 vol%, naphthene 70 vol%)
Base oil B: linear olefin (equivalent mixture of 1-hexadecene and 1-octadecene)
Base oil C: polyisobutylene having a viscosity of 12.1 mm ² / s at a temperature of 40 ° C.

Further, as the oily agent, the following three types of oily agents A to C were used.
Oily agent A: lauryl alcohol oily agent B: butyl stearate oily agent C: oleic acid The following three types of amine derivatives A to C were used as amine derivatives.
Amine derivative A: oleylamineamine derivative B: N, N-dicyclohexylamine ethylene oxide 2-mol adduct amine derivative C: N-ethylisopropanolamine

Next, cold rolling of the aluminum material was performed using the cold rolling lubricating oil of Samples E1 to E15, and the following rolling property test and roll coating amount test were performed. As the aluminum material, two types of materials having different aluminum purities, namely material A and material B, were used.
In the rolling test and roll coating amount test of Sample E2 to Sample E15, the material A was used. Moreover, about the sample E1, it carried out using the material A and the material B, respectively.
Material A contains pure aluminum for industrial use (JIS) containing 0.1% by weight of Si and 0.27% by weight of Fe in addition to Al.
A1050H-18) aluminum plate (width 40 mm, length 450 mm, thickness 2.0 mm).
Material B is an aluminum alloy (JIS) containing 0.25 wt% Fe, 0.35 wt% Mn, and 4.5 wt% Mg in addition to Al.
A5182-H18) aluminum plate (width 40 mm, length 450 mm, thickness 2.0 mm).

(Rollability test)
The rolled material was repeatedly rolled while the roll gap was reduced from 0.4 mm to 0.05 mm for each aluminum material (rolled material). The rolling was repeated until seizure or herringbone was generated and the rolling could not be performed, and the rolling reduction (critical rolling reduction) in the immediately preceding rolling where rolling was impossible was measured. The results are shown in Table 1. The rolling was performed at a rolling speed of 34 m / min using a rolling mill having a roll having a roll diameter of 155 mm and a roll surface roughness of 0.4 μm.

(Roll coating amount test)
First, 30 rolled materials were rolled at a reduction rate of 50%. Then, the roll coating adhering to the surface of the rolling roll of the rolling mill was dissolved with an aqueous sodium hydroxide solution and collected with absorbent cotton. The aluminum solution in absorbent cotton was extracted with pure water, and the amount of aluminum was quantified by atomic absorption spectrometry. The results are shown in Table 1.

Further, in this example, in order to clarify the excellent characteristics of the cold-rolled lubricating oils of Samples E1 to E15, as shown in Table 2 to be described later, nine types of lubricating oils (Samples C1 to C15) are used for comparison. C9) was prepared and its characteristics were examined. Sample C1 to Sample C9 contain the above base oil A (mineral oil having a viscosity of 4.09 mm ² / s at a temperature of 40 ° C. (paraffin 30 vol%, naphthene 70 vol%)) as a base oil. As other optional components, the oily agent A (lauryl alcohol), the amine derivative A (oleylamine), the amine derivative B (N, N-dicyclohexylamine ethylene oxide 2-mol adduct), and the amine derivative C (N-ethyl). Isopropanolamine).

  The sample C1 to sample C9 were also subjected to the rolling test and the roll coating amount test in the same manner as the samples E1 to E15. These tests were performed using the material A as the aluminum material in the samples C1 to 9, and further performed on the material B in the samples C1 and C5. The results are shown in Table 2.

As known from Table 1, when the cold rolling lubricating oil of Sample E1 to Sample E15 was used to roll industrial pure aluminum (Material A), all had a high critical rolling reduction of 65% or more. In addition, the occurrence of roll coating was a very small amount of 420 mg / m ² or less.

That is, in the samples E1 to E15, when rolling industrial pure aluminum, high-pressure rolling with a critical reduction rate of 65% or more can be performed under a relatively high-speed rolling condition of a rolling speed of 34 m / min. Furthermore, despite the use of the material to be rolled made of industrial pure aluminum, the amount of roll coating generated was very low at 420 mg / m ² .
Therefore, the above-mentioned sample E1 to sample E15 cold rolling lubricating oil having a critical rolling reduction of 65% or more and a roll coating amount of 420 mg / m ² is used for high- speed rolling or high-pressure rolling of industrial pure aluminum. it can.

On the other hand, as known from Table 2, in the lubricating oils of samples C1 to C9, when rolling industrial pure aluminum (material A), the critical rolling reduction was 65% or more as in samples E1 to E15. In addition, there was no roller coating amount that could satisfy the condition of 420 mg / m ² or less.

In addition, when the aluminum alloy (material B) is rolled, as is known from Table 1, the sample E1 according to the example of the present invention shows a high critical rolling reduction of 58% and the occurrence of roll coating. Was a very small amount of 185 mg / m ² . Comparative In contrast, as can be understood from Table 2, sample C1 and sample C5 is 52%, respectively, indicate the lower limit rolling reduction of 49%, the amount of roll coating also respectively referred to ^{237mg / m 2, 188mg / m} 2 It was a lot of things.

Thus, according to this example, it can be used for rolling not only high-pure aluminum but also industrial pure aluminum and aluminum alloys, and can exhibit excellent lubricity even in high- speed rolling and high-pressure rolling, and roll coating. It is possible to provide a cold-rolled lubricating oil (Sample E1 to Sample E15) that can suppress the occurrence of the above.

Claims (7)

A lubricating oil used for cold rolling of aluminum,
The lubricating oil comprises an oily agent, an amine derivative, and a base oil,
The oily agent comprises 0.1 to 15 parts by weight of a higher alcohol comprising lauryl alcohol and / or oleyl alcohol, 0.01 to 3 parts by weight of a higher fatty acid having 12 to 18 carbon atoms, and a higher fatty acid ester having 13 to 22 carbon atoms. It consists of one or more selected from 0.1 to 15 parts by weight, the total amount is 0.01 to 33 parts by weight,
The amine derivative has 4 to 20 carbon atoms and is one or more selected from aliphatic amines, alkanolamines, aliphatic polyamines, aromatic amines, alicyclic amines, heterocyclic amines, and alkylene oxide adducts thereof. The total amount is 0.01 to 5 parts by weight,
The said base oil consists of 1 or more types chosen from polyisobutylene, a C12-C18 alpha olefin, and mineral oil, The total amount is 99.98-62 weight part, Cold rolling characterized by the above-mentioned Lubricant.   The cold-rolled lubricating oil according to claim 1, wherein the higher alcohol further contains myristyl alcohol. 3. The cold-rolled lubricating oil according to claim 1, wherein the higher fatty acid comprises a fatty acid represented by the following general formula (2).
R2-COOH (2)
(R2 is an alkyl or alkenyl group having 11 to 17 carbon atoms.) The cold-rolled lubricating oil according to any one of claims 1 to 3, wherein the higher fatty acid ester is a fatty acid ester represented by the following general formula (3).
R3-COO-R4 (3)
(R3 is an alkyl group or alkenyl group having 11 to 17 carbon atoms, and R4 is an alkyl group having 1 to 4 carbon atoms.)   5. The α-olefin as the base oil according to claim 1, wherein the α-olefin is one or more selected from 1-dodecene, 1-tetracene, 1-hexadecene, and 1-octadecene. Cold rolling lubricant. 6. The polyisobutylene as the base oil according to claim 1, wherein the polyisobutylene is represented by the following formula (4) and has a viscosity at a temperature of 40 ° C. of 5 to 20 mm ² / s. Cold rolling lubricant.

(N is a natural number of 1 or more) The cold rolling lubricating oil according to claim 6, wherein the polyisobutylene represented by the formula (4) is hydrogenated.