JP5156180B2 - Hot rolling oil for aluminum - Google Patents

Description

  The present invention relates to a hot rolling oil used for hot rolling of aluminum and a method of hot rolling aluminum using the hot rolling oil.

Hot rolling oil for aluminum is used to reduce friction between a rolling roll of a rolling mill and an aluminum plate to ensure lubricity, and to control the rolling shape and temperature.
As the hot rolling oil, generally, a mineral oil as a base oil and an oily agent has been used.

  In general, in the hot rolling of aluminum, the temperature of the aluminum plate is as high as 300 ° C. to 500 ° C., so that the friction conditions are very severe, and it is considered that the state is boundary lubrication or dry friction. Under such severe friction conditions, once seizure occurs due to insufficient lubrication of the hot rolling oil, there is a risk of affecting the cold rolling in the subsequent process and the surface quality up to the product. Therefore, friction lubrication technology in hot rolling is very important.

Therefore, conventionally, additives having excellent oiliness and extreme pressure effects, such as fatty acids, especially oleic acid, have been used for hot rolling oils.
Also, natural oils and / or synthetic esters are the main components as lubricating oils that are superior in lubricity to hot rolling oils based on mineral oil and that can easily remove aluminum wear powder generated during hot rolling. Hot rolling oil has been developed (Patent Documents 1 to 5).

In recent years, improvement in productivity and quality is desired for aluminum products such as aluminum plates.
In order to improve the productivity and quality of aluminum products, it is effective to improve the lubricity of hot rolling oil in hot rolling of aluminum.
In order to improve the lubricity of hot-rolled oil, increasing the amount of oil-based agent added, adding an oil-based agent with a high oil-based effect, increasing the viscosity of hot-rolled oil, and increasing the oil concentration of the emulsion have been implemented. It was.

However, in these cases, when the aluminum material is inserted into the rolling roll, a large amount of rolling oil adheres to the surface of the rolling roll, and the end face of the aluminum material and the surface of the rolling roll become slippery and become bitten. There was a risk of defects.
In hot rolling, roll coating is inevitably generated on the surface of the rolling roll, but the roll coating may be easily peeled off. When a roll coating that is easily peeled off is formed, there is a problem that a minute roll coating that has been peeled off during hot rolling is pushed into the surface of the aluminum material and a defect called pickup inclusion occurs. This defect does not disappear even in the subsequent cold rolling, and adversely affects the surface quality of the product.

Furthermore, in the case of excessive lubrication, there has been a problem that hot rolling becomes unstable, and a plate flow in which the plate is biased to either side occurs, which makes it impossible to operate.
In addition, the amount of hot rolling oil remaining on the surface of the aluminum material after hot rolling is large because the hot rolling oil is less likely to evaporate due to heat and the amount of oil introduced into the roll bite increases. Therefore, when left in a coil state, there is a problem that slip occurs between the plates and coil collapse occurs.
Therefore, merely improving the lubricity of the hot rolling oil by the above-described prior art may lead to an increase in cost and may greatly affect the production efficiency.

Japanese Patent No. 2990021 Japanese Patent No. 2899224 Japanese Patent No. 2750510 JP-A-11-140477 JP-A-10-176180

  The present invention has been made in view of such conventional problems. In hot rolling of an aluminum material, it suppresses biting failure, plate flow, and coil collapse, and provides a uniform and dense roll coating on the surface of the rolling roll. It is intended to provide a hot rolling oil for aluminum and a hot rolling method that can be formed.

The first invention is a hot rolling oil for aluminum containing at least a lubricating oil containing a base oil and an oily agent, a first additive, and a second additive.
The first additive comprises one kind of amine derivative, and the amine derivative is an alkanolamine having 4 to 20 carbon atoms,
The second additive is at least one selected from an amine derivative different from the first additive, a dialkylsulfosuccinate having 4 to 18 carbon atoms in the alkyl group , and an oxygen-containing compound having a number average molecular weight of 120 or more and less than 1000. Consists of
The amine derivative is one selected from aliphatic amines having 4 to 20 carbon atoms, alicyclic amines having 4 to 20 carbon atoms, N-ethylisopropanolamine, and their alkylene oxide adducts having 2 to 6 carbon atoms. That's it,
The oxygen-containing compound is tripropylene glycol,
The total amount of the first additive and the second additive is 0.01 to 15.0 parts by weight with respect to 100 parts by weight of the lubricating oil. (Claim 1).

As described above, the hot rolling oil of the first invention contains the lubricating oil, the first additive, and the second additive in the specific amount range.
Therefore, the said hot rolling oil can exhibit the following outstanding rolling lubricity.
That is, the hot rolling oil is less likely to remain on the surface of the rolling roll, and the occurrence of biting failure can be suppressed.

Moreover, the said hot rolling oil can show the outstanding lubricity suitable for hot rolling, and can suppress generation | occurrence | production of the plate flow in hot rolling.
Moreover, since it becomes difficult for the said hot rolling oil to remain | survive on the plate | board surface of an aluminum material, generation | occurrence | production of the coil crushing in hot rolling can be suppressed.
Moreover, the hot rolling oil can easily form a uniform and dense roll coating on the surface of the rolling roll, and can suppress the occurrence of pickup inclusions on the plate surface in the hot rolling.

The second invention is a method of hot rolling an aluminum plate using the hot rolling oil for aluminum of the first invention,
The hot rolling oil for aluminum is dispersed in water in an amount of 3 to 15 parts by weight to form an emulsion, and is supplied to a rolling roll of a hot rolling mill and / or the aluminum plate. In the method (Claim 3 ).

  The present invention performs hot rolling using the above-described excellent hot rolling oil as an emulsion. Therefore, in hot rolling of an aluminum material, it is possible to suppress biting failure, plate flow, and coil crushing, and to form a uniform and dense roll coating on the surface of the rolling roll.

  The hot rolling oil of 1st invention contains the said lubricating oil, the said 1st additive, and the said 2nd additive. The total content of the first additive and the second additive is 0.01 to 15.0 parts by weight with respect to 100 parts by weight of the lubricating oil.

  When the total content of the first additive and the second additive is less than 0.01 parts by weight, the roll coating may not be uniform and dense. On the other hand, even if added in excess of 15.0 parts by weight, the solubility in the base oil is lowered, a remarkable improvement effect cannot be obtained, and there is a possibility that the manufacturing cost may be increased. Further, if the total content is excessively large, the residual amount on the roll surface is increased, and there is a possibility that a biting failure may occur. Therefore, preferably, the total content of the first additive and the second additive is 1.0 to 10.0 parts by weight with respect to 100 parts by weight of the lubricating oil.

Next, the first additive is made of an amine derivative. Further, Examples of the second additive may be at least one or more different derivatives, alkyl sulfonates, and the number average molecular weight 120 to 1,000 less oxygenates from the first additive. The amine derivative as the first additive is an aliphatic amine, an alkanolamine, an aliphatic polyamine, an aromatic amine, an alicyclic amine, a heterocyclic amine, or an alkylene oxide adduct thereof, and the second addition The amine derivative as the agent is preferably at least one selected from aliphatic amines, alkanol amines, aliphatic polyamines, aromatic amines, alicyclic amines, heterocyclic amines, and alkylene oxide adducts thereof. . These amine derivatives can contain hydroxyl groups, ether groups and the like.

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

  Examples of the alkanolamine include monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N, N-dimethylethanolamine, N-ethylethanolamine, N, N-diethylethanolamine, and N-isopropylethanolamine. N, N-diisopropylethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N-methylisopropanolamine, N, N-dimethylisopropanolamine, N-ethylisopropanolamine, N, N-diethylisopropanolamine, N-isopropylisopropanolamine, 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, There are N-isopropylbutanolamine, N, N-diisopropylbutanolamine and the like.

  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, N, N-di (3-methyl-cyclohexyl). ) Amine, 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-lupetidine, 2,6-lupetidine, 3,5-lupetidine, piperazine, homopiperazine, and N-methyl. Piperazine, N-ethylpiperazine, N-propylpiperazine, N-methylhomopiperazine, N-acetylpiperazine, 1- (chlorophenyl) piperazine, N-aminoethylpiperidine, N-aminopropylpiperidine, N-aminoethylpiperazine, N- Examples include aminopropylpiperazine, N-aminoethylmorpholine, N-aminopropylmorpholine, N-aminopropyl-2-pipecoline, N-aminopropyl-4-pipecholine, 1,4-bis (aminopropyl) piperazine.

  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. In addition, when the total number of carbon atoms of the amine derivative exceeds 20, there is a risk that oil stain is likely to occur or poor biting may occur in the annealing performed after hot rolling of aluminum.

The alkylene oxide adduct can be obtained, for example, by addition polymerization of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, α-olefin oxide, and styrene oxide. As the polymerization form of the added alkylene oxide, there are homopolymerization of one type of alkylene oxide, random copolymerization of two or more types of alkylene oxide, block copolymerization, random / block copolymerization, and the like.
Moreover, when the addition mole number of alkylene oxide exceeds 6 mol, there exists a possibility that the solubility to a base oil may worsen, and there exists a possibility of having a bad influence on the emulsifiability to an emulsion. More preferably, the number of added moles of alkylene oxide is 1 to 4 moles.

As the first additive, among the amine derivatives, alkanolamine is preferably used, and triethanolamine is more preferable.
In this case, the rolling lubricity of the hot rolling oil can be further improved.

The amine derivative in the second additive is an amine derivative different from the substance used as the first additive among the amine derivatives. Therefore, the amine derivative as the first additive and the amine derivative that can be used as the second additive are represented by different structural formulas.
Specifically, for example, when triethanolamine is used as the first additive, the second additive includes amines such as alkanolamines, aliphatic amines, and aromatic amines other than triethanolamine. One or more selected from the derivatives, the alkyl sulfonates, and the oxygen-containing compounds can be used.

  Examples of the alkyl sulfonate include alkyl sulfonic acid, alkyl allyl sulfonic acid, amido sulfonic acid, sodium dialkyl sulfo succinate and the like. In consideration of cost and the like, sodium dialkylsulfosuccinate is preferable, and the alkyl group preferably has 4 to 18 carbon atoms.

Moreover, as the oxygen-containing compound, those having a number average molecular weight of 120 or more and less than 1000 can be used. When the number average molecular weight of the oxygen-containing compound is less than 120, the solubility in the base oil may be reduced. On the other hand, in the case of 1000 or more, it may remain on the surface of the aluminum material and may cause oil stain in the annealing performed after hot rolling.
Specific examples of the oxygen-containing compound include, for example, an alkylene oxide adduct of a polyhydric alcohol having 3 to 6 hydroxyl groups and a number average molecular weight of 200 or more and less than 1000, and a hydrocarbyl ether thereof, a number average molecular weight of 120 or more and 1000. Less polyalkylene glycol and its hydrocarbyl ether, dihydric alcohol having 2 to 10 carbon atoms, and the like.
As the oxygen-containing compound, one type or two or more types having different structures can be used.

Specific examples of the oxygen-containing compound include the following.
Examples of the polyhydric alcohol alkylene oxide adduct and the polyhydric alcohol constituting the hydrocarbyl ether thereof include glycerin, polyglycerin, trimethylolalkane, trimethylolalkane dimer and tetramer, pentaerythritol, dipentaerythritol. 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerol condensate, adonitol Arabitol, xylitol, mannitol, idylitol, taritol, dulcitol, allitol, xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobio Vinegar, a maltose, isomaltose, trehalose, and sucrose and the like.

The alkylene oxide to be added preferably has 2 to 6 carbon atoms. More preferably, it has 2 to 4 carbon atoms.
Examples of the alkylene oxide include ethylene oxide, propylene oxide, 1,2-epoxybutane, 2,3-epoxybutane, 1,2-epoxy-1-methylpropane, 1,2-epoxyheptane, and 1,2-epoxy. There are hexane and the like.
Examples of the adduct such as alkylene oxide include homopolymerization of one kind of alkylene oxide, random copolymerization of two or more kinds of alkylene oxide, block copolymerization, random / block copolymerization, and the like.
Moreover, when adding an alkylene oxide to the polyhydric alcohol which has 3-6 hydroxyl groups, the hydroxyl group added may be all the hydroxyl groups or one part hydroxyl group.

In addition, it is also possible to use a hydrocarbyl etherified part or all of the terminal hydroxyl groups of the polyhydric alcohol alkylene oxide adduct.
The hydrocarbyl group is a hydrocarbon group having 1 to 24 carbon atoms.
Examples of the hydrocarbon group include an alkyl group, an alkenyl group, a cycloalkyl group, an alkylcycloalkyl group, an aryl group, an alkylaryl group, and an arylalkyl group.
Examples of the alkyl group having 1 to 24 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, straight chain or branched Pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, straight Chain or branched undecyl group, linear or branched dodecyl group, linear or branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched Hexadecyl group, linear or branched heptadecyl group, linear or branched octadecyl group, linear or branched nonadecyl group, linear or branched icosyl group, linear or branched heicosyl group, linear Or a branched docosyl group, linear or branched Tricosyl group, and the like straight or branched Tetoraikoshiru group.

  Examples of the alkenyl group having 2 to 24 carbon atoms include a vinyl group, a linear or branched propenyl group, a linear or branched butenyl group, a linear or branched pentenyl group, and a linear or branched hexenyl group. Group, linear or branched heptenyl group, linear or branched octenyl group, linear or branched nonenyl group, linear or branched decenyl group, linear or branched undecenyl group, linear or Branched dodecenyl group, linear or branched tridecenyl group, linear or branched tetradecenyl group, linear or branched pentadecenyl group, linear or branched hexadecenyl group, linear or branched heptadecenyl group A linear or branched octadecenyl group, a linear or branched nonadecenyl group, a linear or branched icosenyl group, a linear or branched henicosyl group, a linear or branched dococenyl group, a linear or branched group Branch tricocenyl , And the like straight or branched tetracosenyl group.

  Examples of the cycloalkyl group having 5 to 7 carbon atoms include a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group.

  Examples of the alkylcycloalkyl group having 6 to 11 carbon atoms include a methylcyclopentyl group, a dimethylcyclopentyl group (including all structural isomers), a methylethylcyclopentyl group (including all structural isomers), a diethylcyclopentyl group ( Including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (including all structural isomers) Including), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers), methylethylcycloheptyl group (including all structural isomers), diethylcycloheptyl group (including all structural isomers) Etc.

  Examples of the aryl group having 6 to 10 carbon atoms include a phenyl group and a naphthyl group.

  Examples of the alkylaryl group having 7 to 18 carbon atoms include a tolyl group (including all structural isomers), a xylyl group (including all structural isomers), and an ethylphenyl group (including all structural isomers). , Linear or branched propylphenyl group (including all structural isomers), linear or branched butylphenyl group (including all structural isomers), linear or branched pentylphenyl group (all ), Linear or branched hexylphenyl group (including all structural isomers), linear or branched heptylphenyl group (including all structural isomers), linear or branched Branched octylphenyl groups (including all structural isomers), linear or branched nonylphenyl groups (including all structural isomers), linear or branched decylphenyl groups (including all structural isomers) ), Straight or branched unde Butylphenyl (including all structural isomers) group, and the like straight chain or branched dodecylphenyl group (including all structural isomers).

  Examples of the arylalkyl group having 7 to 12 carbon atoms include benzyl group, phenylethyl group, phenylpropyl group (including propyl group isomers), phenylbutyl group (including butyl group isomers), and phenylpentyl group. (Including isomers of pentyl groups), phenylhexyl groups (including isomers of hexyl groups), and the like.

Next, the polyalkylene glycol and the alkylene oxide constituting the hydrocarbyl ether preferably have 2 to 6 carbon atoms.
Examples of such alkylene oxides include those listed as alkylene oxide adducts of the above-mentioned polyhydric alcohols and alkylene oxides constituting the hydrocarbyl ethers.
Moreover, as the hydrocarbyl ether of the polyalkylene glycol, one obtained by converting a part or all of the terminal hydroxyl groups of the polyalkylene glycol into a hydrocarbyl ether can be used.
Examples of the hydrocarbyl group include the above-described groups listed as the hydrocarbyl group constituting the alkylene oxide adduct of the polyhydric alcohol and the hydrocarbyl ether thereof.

Then, as the dihydric alcohol, it is preferable to use those having 2 to 10 carbon atoms.
Examples of such dihydric alcohols include ethylene glycol, 1,3-propanediol, propylene glycol, 1,4-butanediol, 1,2-butanediol, 2-methyl-1,3-propanediol, 1 , 5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 2-methyl-2,4-pentanediol, 1,7-heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 1,8-octanediol, 1,9-nonanediol, 2-butyl-2-ethyl- Examples include 1,3-propanediol and 1,10-decanediol.

Next, the lubricating oil will be described.
The lubricating oil comprises a base oil made of mineral oil, the oily agent made of at least one of fatty acids, synthetic esters, or natural oils, and fatty acid amine soaps, sodium sulfonates, or polyethylene glycol type nonionic surfactants. it preferably contains an emulsifier consisting of at least one (claim 2).

Examples of the mineral oil used as the base oil include aroma-based mineral oil, naphthenic mineral oil, paraffin-based mineral oil, and non-aromatic mineral oil.
Next, examples of the oily agent include fatty acids, synthetic esters, and natural fats and oils as described above.
Examples of the fatty acid include oleic acid, lauric acid, myristic acid, palmitic acid, and stearic acid.
Examples of the synthetic ester include neopentyl glycol ester, trimethylol propane ester, and pentaerythritol ester.
Examples of the natural fats and oils include palm oil, pork fat, beef tallow, and castor oil.

Examples of the fatty acid amine soap include triethanol oleate, monoethanol oleate, and diethanol oleate.
Examples of the sodium sulfonate include sodium dioctylsulfosuccinate, disodium octylsulfosuccinate, and sodium dodecylbenzenesulfonate.
Examples of the polyethylene glycol type nonionic surfactant include polyoxyethylene trimethylolpropane trilaurate, polyoxyethylene pentaerythritol trilaurate, and polyoxyethylene oleyl ether.

Moreover, in the said hot rolling oil, any 1 type, or 2 or more types, such as antioxidant, a rust inhibitor, a corrosion inhibitor, and an antifoamer, can be added.
Examples of the antioxidant include phenolic compounds such as 2,6-ditert-butyl-P-cresol, aromatic amines such as phenyl-α-naphthylamine, partial esters of polyhydric alcohols such as sorbitan monooleate, phosphorus Acid esters and derivatives thereof.
Examples of the corrosion inhibitor include benzotriazole.
Examples of antifoaming agents include silicon-based ones.

In the hot rolling method of the second invention, the hot rolling oil for aluminum is used in an emulsion state by dispersing 3 to 15% by weight in water.
When the dispersion ratio of the hot rolling oil in water is less than 3% by weight, the amount of plate-out (water spreading) to the rolling roll may be reduced. On the other hand, in the case of 15% by weight or more, Further, the cooling performance is lowered, the effect of improving the lubricity cannot be obtained, and there is a possibility that the manufacturing cost is increased wastefully.

Example 1
Next, the hot rolling oil for aluminum concerning the Example of this invention is demonstrated. In this example, as shown in Table 1 described later, a plurality of hot rolling oils (samples E1 to E11) having different compositions are prepared.
The hot rolling oil (sample E1 to sample E11) of this example contains a lubricating oil containing a base oil and an oily agent, a first additive, and a second additive. The first additive is composed of one kind of amine derivative, and the second additive is at least one kind of amine derivative different from the first additive, dialkylsulfosuccinate , and oxygen-containing compound having a number average molecular weight of 120 or more and less than 1000. Consists of one or more. The total amount of the first additive and the second additive is 0.01 to 15.0 parts by weight with respect to 100 parts by weight of the lubricating oil.

  In producing the hot rolled oil (samples E1 to E11) of each sample, mineral oil is used as the base oil, oleic acid and oil (especially palm oil in this example) is used as the oil agent, and A nonionic surfactant was used as an emulsifier. Further, triethanolamine (TEA) is used as the first additive, and tripropylene glycol (TPG), sodium 2-ethylsulfosuccinate (EHS), oleylamine (OA), N, and the like as the second additive. N-dicyclohexylamine ethylene oxide 2-mol adduct (GHA) or N-ethylisopropanolamine (EPA) was used.

These mineral oils, oleic acid, fats and oils, nonionic surfactant, first additive, and second additive were mixed at the blending ratio shown in Table 1 to produce 11 types of hot rolled oil (see Table 1). ).
Each sample (sample E1 to sample E11) is produced by changing the type and amount of the second additive. The composition of the samples E1 to E11 is shown in Table 1 described later.

Moreover, in this example, 6 types of hot rolling oil (sample C1-sample C6) were produced for the comparison of samples E1-E11 (refer Table 2).
Sample C1 was prepared in the same manner as Samples E1 to E11 except that it was prepared without using the second additive.
Samples C2 to C6 are produced by changing the amount of the second additive from the samples E1 to E11.
The composition of each material C1 to sample C6 is shown in Table 2 described later.

Next, while performing hot rolling of the aluminum material using the hot rolling oils of Sample E1 to Sample E11 and Sample C1 to Sample C6 produced as described above, the following rolling test was performed to perform each sample (sample). The rolling characteristics of E1 to Sample E11 and Samples C1 to C6) are evaluated.
In hot rolling, the hot rolling oil of each sample is dispersed in water to form an emulsion with an oil concentration of 10 vol%, and the hot rolling oil emulsion is supplied to a rolling roll of a hot rolling mill and / or an aluminum plate. To do.

(Rollability test)
Using a rolling mill having a roll having a roll diameter of 155 mm and a roll surface roughness of 1.0 μm, the aluminum material was hot-rolled 10 times under the conditions of a rolling speed of 34 m / min and a plate material temperature of 450 ° C. At this time, the hot rolling oil (emulsion state) of each sample was supplied to the roll of the rolling mill and the aluminum material. As the aluminum material, JISA-5182F (width 40 mm, length 450 mm, thickness 5.0 mm) was used.

  The surface of the rolling roll of the hot rolling mill after the rolling test was magnified up to 150 times with a microscope, observed, and the roll coating surface quality was evaluated. The case where the adhered aluminum fine powder was uniform was rated as “◯”, and the case where the adhered aluminum fine powder was uneven was marked as “X”. The results are shown in Tables 1 and 2.

  Moreover, the roll coating adhering to the surface of the rolling roll of a hot rolling mill after the rolling test 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 Tables 1 and 2 as roll coating amounts.

  Moreover, about the aluminum material after a rolling test, after degreasing | defatting with hexane, the sulfuric acid aluminumite (film thickness of 1 micrometer) was performed, and the defect of the plate surface was evaluated visually. The case where defects were clearly recognized was rated as x, and the case where defects were not recognized was marked as ◯. The results are shown in Table 1.

  As is known from Table 1, when hot rolling of the aluminum material was performed using the hot rolling oil of Samples E1 to E11, both showed good roll coating surface quality and plate surface quality. . On the other hand, as is known from Table 2, when the aluminum material was hot rolled using the hot rolling oil of sample C1, the roll coating surface quality of the surface of the rolling roll after hot rolling was Was uneven and clear defects were observed on the surface of the aluminum plate. Moreover, the roll coating amount of the sample C1 was large as compared with the samples E1 to E11. From this, in hot rolling oil, it turns out that the outstanding rolling lubricity is obtained by adding a 1st additive and a 2nd additive like the samples E1-E11.

  Further, as known from Table 2, when hot rolling was performed using Sample C2 to Sample C6 containing a larger amount of the second additive than Sample E1 to Sample E11, it was the same as Sample E1 to Sample E11. Showed excellent hot rollability. However, when the sample C1 to sample C6 and the sample E1 to sample E11 are compared with respect to the roll coating amount, there is no great difference between them, and even if an additive is added more than necessary, the effect of improving rolling lubricity is hardly obtained. I understand. Therefore, it is not preferable to wastefully increase the additive content from the viewpoint of manufacturing cost.

  As described above, when the hot rolling oil of the present invention (samples E1 to E11) is used, in hot rolling of an aluminum material, biting failure, plate flow, and coil crushing are suppressed, and the surface of the rolling roll is uniform. A dense roll coating can be formed.

Claims (3)

In hot rolling oil for aluminum containing at least a lubricating oil containing a base oil and an oily agent, a first additive, and a second additive,
The first additive comprises one kind of amine derivative, and the amine derivative is an alkanolamine having 4 to 20 carbon atoms,
The second additive is at least one selected from an amine derivative different from the first additive, a dialkylsulfosuccinate having 4 to 18 carbon atoms in the alkyl group , and an oxygen-containing compound having a number average molecular weight of 120 or more and less than 1000. Consists of
The amine derivative is one selected from aliphatic amines having 4 to 20 carbon atoms, alicyclic amines having 4 to 20 carbon atoms, N-ethylisopropanolamine, and their alkylene oxide adducts having 2 to 6 carbon atoms. That's it,
The oxygen-containing compound is tripropylene glycol,
The hot rolling oil for aluminum, wherein the total amount of the first additive and the second additive is 0.01 to 15.0 parts by weight with respect to 100 parts by weight of the lubricating oil.   The lubricating oil according to claim 1, wherein the lubricating oil includes a base oil made of mineral oil, the oily agent made of at least one of fatty acids, synthetic esters, or natural fats and oils, an amine soap of fatty acids, sodium sulfonate, or a polyethylene glycol non-type. A hot rolled oil for aluminum, comprising an emulsifier comprising at least one ionic surfactant. A method of hot rolling an aluminum plate using the hot rolling oil for aluminum according to claim 1 or 2,
The hot rolling oil for aluminum is dispersed in water in an amount of 3 to 15% in an emulsion state and supplied to a rolling roll of a hot rolling mill and / or the aluminum plate. Method.