JP2003522279A - Hot rolling method for rolling aluminum and aluminum alloy sheets - Google Patents

Abstract

The present invention relates to a water-soluble aluminium and aluminium alloys hot rolling composition comprising a base stock oil and, based on the total weight of the composition, from 1 to 80% by weight of di(2-ethylhexyl) adipate ester. The invention also relates to an oil-in-water emulsion, to a process for hot rolling aluminium and aluminium alloys and to the use of the oil-in-water emulsion in a hot rolling process. <IMAGE>

Description

Detailed Description of the Invention

The present invention relates to a hot rolling method for rolling aluminum and aluminum alloy sheets. The present invention also relates to a water-soluble aluminum and aluminum alloy hot rolling oil composition, an oil-in-water emulsion produced using the same, and use of the oil-in-water emulsion in a hot rolling method. The aluminum and aluminum alloy rolling industry has pointed out the need to maximize the efficiency of these rolled metal manufacturing processes. In general, this means that it is desired to operate at higher rolling speeds and to produce more goods per operation shift. It is also desirable to minimize the number of passes through the equipment used to achieve a given reduction level. Both of these routes require no compromise on quality and surface finish.

The present invention therefore provides an oil composition for hot rolling mills, which provides the following advantages: -Higher reduction ratios: 1-pass reductions can in most cases be achieved. -Better rolling performance (compared to the rolling performance obtained with conventional oil compositions)
Lower rolling force and reduced power consumption);-improved rolling surface finish quality; -shorter emulsion break-in period, which is the time required to obtain optimal particle size distribution; -Excellent corrosion resistance; and-High lubricity (plate-out properties, roll coating). The present invention, whether reversible or not, provides a breakdown,
Effective for any type of hot rolling in tandem and combination rolling mills. In particular, the present invention exhibits high reduction and rolling capacity, but excellent strip surface finish (during high speed rolling). Prior art references do not teach or suggest the present invention.

Accordingly, the present invention is a hot rolling method for rolling aluminum and aluminum alloy sheets, wherein the base stock oil and the water-soluble oil composition are 1 to 80% by weight, preferably based on the total weight of the oil composition. A method is provided which comprises applying an effective amount of an oil-in-water emulsion comprising a water-soluble oil composition comprising 3 to 30 wt% di (2-ethylhexyl) adipate and water. According to some embodiments, the oil composition further comprises 0 weight percent based on the total weight of the composition.
． It contains from 05 to 20% by weight, preferably from 0.1 to 5% by weight of a nonionic surfactant such as an ethylene oxide addition polymer. An example of such an ethylene oxide addition polymer is the ethylene oxide addition polymer sold under the trade name Hypermer® A60 by the company ICI. According to a further aspect, the oil composition further comprises 1-30%, preferably 5-20% oleic acid, based on the total weight of the composition. In fact, it is believed that free oleic acid provides a good surface finish to aluminum or aluminum alloy strips.

The present invention further provides water-soluble aluminum and aluminum alloy hot rolling oil compositions. The present invention further provides a method for producing a water-soluble oil composition. The invention further provides an oil-in-water emulsion containing the oil composition, and a method of making this emulsion. The invention also provides the use of the water-soluble oil composition of the invention for producing an emulsion intended for use in a method for hot rolling aluminum or aluminum alloys. Finally, the invention provides the use of emulsions in hot rolling processes. In the following, the invention will be described in more detail.

FIG. 1 is a graph showing the rolling force applied versus the number of passes applied, first with a conventional emulsion and then with an emulsion of the invention. FIG. 2 is a graph showing the applied net rolling force versus the number of passages, first using the conventional emulsion and then using the emulsion of the present invention.

The water-soluble oil composition of the present invention is generally a neat oil concentrate intended to be diluted in water to provide an oil-in-water emulsion. Base stock oil is typically any of the oils used in the field of hot rolling. It may be paraffinic or naphthenic. Paraffinic base oils are made from crude oils with relatively high alkane content (high paraffin and isoparaffin content). Typical crude oils are from the Middle East, North Sea, and central United States. The method of preparation requires removal of aromatics (usually by solvent extraction) and dewaxing. Paraffinic base oils are characterized by their good viscosity / temperature properties, ie high viscosity index, suitable low temperature properties and good stability. They are often referred to as solvent neutral, where solvent means that the base oil has been solvent refined, and neutral means that the oil has a neutral pH. Other displays are
It is a high viscosity index (HVI) base oil. They are available in a wide range of viscosities, light spindle oils to viscous bright stocks.

The naphthenic base oil originally has a low pour point, has no wax, and has an excellent dissolving power. Solvent extraction and hydrotreating can be used to reduce polycyclic aromatic content. The preferred base oil is a mixture of paraffinic and naphthenic oils. Base oils are typically 7 to 150 cSt at 40 ° C, and preferably 4
It has a viscosity of 20-50 cSt at 0 ° C. The water-soluble oil composition preferably comprises a trialkanolamine (C _2-4 ), preferably triethanolamine, in an amount such that all the binding trialkanolamine binds only to the oleic acid moiety. Is. The purpose of this embodiment is to ensure that free oleic acid remains in the oil composition. The reaction product of trialkanolamine and oleic acid acts as a surfactant.

Water-soluble oil compositions may be formulated with conventional additives such as surfactants, coupling agents or cosurfactants, friction modifiers, lubricants, corrosion inhibitors or antioxidants, extreme pressures. Agents and antiwear agents, bactericides and fungicide
), An antifoaming agent, and a rust preventive agent may be included. Examples of antifoam agents are silicone-based, in particular polydimethylsiloxane. Examples of corrosion inhibitors are hindered phenols and zinc dialkyldithiophosphates (
ZDDP). Examples of extreme pressure agents and antiwear agents are dilauryl phosphate, didodecyl phosphite, trialkyl phosphates such as tri (2-ethylhexyl) phosphate, tricresyl phosphate (TCP), dialkyl (or diaryl) zinc dithiophosphates. (ZDDP), phosphosulphurized fatty oil, zinc dialkyldithiocarbamate, mercaptobenzothiazole, sulfurized fatty oil, sulfurized terpene, sulfurized oleic acid, alkyl and aryl polysulfides, whale sulfurized oil, sulfurized mineral oil, sulfur chloride-treated fatty oil, chlornaphthaxanthogenic acid Salt, cetyl chloride, paraffin chloride oil,
Chlorinated paraffin wax sulfide, Chlorinated paraffin wax, and zinc dialkyl (diaryl) dithiophosphate (ZDDP), tricresyl phosphate (T
CP), trixylyl phosphate (TXP), and dilauryl phosphate.

Examples of corrosion inhibitors and antioxidants are radical scavengers such as phenolic antioxidants (steric hindrance), amine antioxidants, organic copper salts, hydroperoxide decomposers, butylhydroxytoluene. An example of a rust inhibitor is an amine derivative of alkenyl succinic anhydride. Examples of friction modifiers or lubricants are fatty acids (C _12-20 ), such as lauric acid, oleic acid, palmitic acid, alkyl (C _6-10 ) alkylate (C _12-20 ) esters such as di (2-). Ethylhexyl) adipate. Further ingredients for base oils and additives can be found in “Chemistry and Technolo
gy of Lubricants ”, RM Mortier and ST Orszulik, VCH Publishers, In
c, 1992.

The components contained in the water-soluble oil composition of the present invention are as follows (the ratio is a mass ratio based on the total mass of the composition): −0.1 to 0.5% Trialkyl (C _1-4 ) phenol; -0.5 to 4.0% trialkyl (C _3-10 ) phosphate ester; -5 to 15% di (2-ethylhexyl) adipate ester; -5 15% of organic fatty acid (C _12-20); -0.5~2% of 5-carboxy-4-hexyl-2-cyclohexen-1
Octanoic acid; -1～3% of alkylene (C _2-6) glycol; -0.3～1% of ethoxylated alcohols (C _5-14, comprising 2-10 CH ₂ O groups); -2 ˜5% trialkanolamine (C _2-4 ); balance naphthenic and paraffinic lubricating base oil mixture.

The oil composition is prepared by adjusting the base oil and other ingredients, preferably with stirring or using any mixing device, provided that the temperature does not exceed 50 ° C., and more preferably 35 ° C. It is manufactured by blending while. Oil-in-water emulsions are prepared by diluting the oil composition of the present invention in water with stirring. It is preferred to use deionized water which may be pre-warmed to approximately 35 ° C. Emulsions are generally 0 based on water and the total volume of the emulsion.
． It contains 5 to 30% by volume, preferably 1 to 15% by volume of the oil composition. Aluminum alloy according to the present invention is any of the aluminum alloy, 10
Including 00, 2000, 3000, 5000, 6000, 7000 series. The hot rolling method can be a conventional method. Rolled metal temperatures are generally about 600-650 ° C for breakdown rolling mills and about 400-500 ° C for tandem rolling mills.

The method is preferably carried out in a breakdown mill, a tandem mill or a finishing mill. The oil composition of the present invention enables a significant reduction in the number of passages. With conventional oils, the number of passes is typically thirteen. With the oil composition of the present invention it is possible to reduce this number of passes by two, which is a significant improvement. When hot rolling is carried out in a breakdown rolling mill, the emulsion preferably comprises from 2 to 4% by volume of the oil composition, based on the total volume of the emulsion. When the hot rolling is done in a finishing or tandem mill, the emulsion preferably comprises from 5 to 7% by volume of the oil composition, based on the total volume of the emulsion. The present invention will be described by the following examples, but the present invention is not limited thereto. All parts and percentages are by weight unless otherwise noted.

[0013] Compositions were prepared by mixing the ingredients according to the order described in Table in Example Table 1. The temperature was maintained at a maximum of 35 ° C to ensure complete dissolution and homogenization of the components without compromising the properties of the emulsion. *: Sold by ICI under the trade name Hypermer (registered trademark) A60

The properties of the composition of Table 1 are listed in Table 2.

The emulsion was prepared by diluting, with stirring, the oil composition of Table 1 into deionized water preheated to 35 ° C. The properties of the resulting emulsion are listed in Table 3.

¹⁾ : The stability of the emulsion was measured by the following means. 470 ml of dilution water at room temperature or test temperature was placed in an 800 ml beaker. 5 with 4 paddles
A 0 ml stirrer was attached to the stirrer motor such that the paddle was located 25 mm above the bottom of the beaker. A 50 ml dropping funnel was attached so that the exit was 15 mm from the beaker wall. The stirrer was turned on and its speed was adjusted to 1000 rpm. The sample was then heated to a temperature of 35 ± 1 ° C. Test oil 30ml
Was added to the dropping funnel. The drip rate was adjusted so that all the oil migrated to the water within 120 ± 20 seconds. Then, while maintaining the sample temperature at 35 ± 1 ° C,
Stirring was continued for another 60 seconds. The obtained emulsion was poured into a 500 ml graduated cylinder and allowed to stand at room temperature for 20 hours. After 20 hours, the volume% of the upper layer (yellow cream + oil) was read.

Experiments A blank was first prepared by diluting a conventional oil composition having the composition set forth in Table 4:

Two emulsions were prepared by diluting each of the inventive and conventional oil compositions in deionized water. Measurements on a Sephy Zetameter show that the Zeta potential of both emulsions is -62 mV, which means that these emulsions have a high stability. Both emulsions were evaluated on an industrial test mill. The rolling conditions were as follows: -Rolling machine type: 2 high-Motor power: 45 kW or 67 kW-Roll diameter: 760 mm-Roll hardness: 58-61 Rockwell C-Maximum width of metal: 685 mm-Typical metal Width: 305 mm-Maximum speed: 30 m / min-Inlet temperature (ingot): 450 ° C-Ingot size: 305 x 610 x 1650 mm-Final thickness: 25.4 mm-Emulsion volume: 400 liters-Emulsion temperature: 50 ° C-Emulsion concentration : 5%.

[0019]   The following procedure was performed in rolling tests for each oil: 1. Lightly scrape the surface of the AA5182 block and degrease it with methyl ethyl ketone.
Heated to 54 ° C. 2. Clean the rolls of the rolling mill in a dilute solution of sodium hydroxide and
Of the roll coating was removed and then washed. Wash water with residual caustic
I checked for it. Use a profilometer to measure surface roughness
It was measured. 3. The roll was preheated to 77 ° C using a quartz-tube heater. 4. Adjust the coolant spray to 6.9.10 in the top spray header. ^Four Newton / m²(10 psig) and 4.1 10 in the bottom header^Five
Newton / m²A flow rate of 200 l / min at (60 psig) was obtained.

5. A 100 cm (4 inch) thick AA5182 block was obtained in 5 rolling passes using the following nominal pass schedule. The rolling speed was 18.3 m / min. All passes were in the east to west rolling direction. The rolling mill gap set point is recorded for the first test emulsion and then
Duplicate for the remaining emulsion. These settings were 1.27 mm, less than the nominal desired exit thickness for each pass. Nominal pass schedule: Pass 1 100 mm-83 mm Pass 2 83 mm-65 mm Pass 3 65 mm-50 mm Pass 4 50 mm-37 mm Pass 5 37 mm-25 mm 6. A 600 mm long piece of metal was sheared from a 25 mm thick piece of medium length that was later used for anodization. The two remaining pieces were returned to the furnace for reheating.

7. The second block is 5. And 6. Obtained by the same treatment as described in. The oil concentrate was added to the emulsion to give a 7% volume concentration. 8. Then, two pieces of each original block were rolled after reheating at a rolling speed of 18.3 m / min using the following nominal pass schedule: Pass 6 25 mm-16 mm Pass 716 mm-9.5 mm Pass 8 9.5 mm. ~ 5 mm 9. After the final pass, two 600 mm long pieces were heat sheared from each rolled piece. This metal was saved for later inspection in rolling and anodizing conditions. The distance of the two marks engraved on the roll was measured at the strip surface after the final pass for use in computational advance slip. 10. The top work roll was then sampled via known area caustic soda extraction for subsequent measurement of the aluminum deposited thereon.

FIG. 1 is a graph showing rolling force (ton) applied on aluminum alloy AA5182 vs. number of passes. As can be seen, an average of 2.2% improvement was achieved with the emulsion of the present invention over that of the conventional emulsion. FIG. 2 is a graph showing the applied net rolling force (bearing loss from total power, kW) versus the number of passes. An average of 5.0 due to the emulsion of the present invention over conventional emulsions
% Improvement was achieved. Using a pilot anodization line, a length of about 150 mm and a thickness of 25 mm and 5
mm pieces were anodized (see 6. above) to give a highlight pickup and surface appearance. The means were as follows:

1. Clean for 3 minutes with a non-erodible alkaline cleaner. 2. 2 washes. 3. Nitric acid desmut for 2 minutes. 4. 2 washes. 5. Anodizing in 15% sulfuric acid at 15 volts for 10 minutes. 6. 2 washes. 7. Dry. The results showed that the luminous intensity and uniformity of the surface finish of the aluminum or aluminum alloy sheet after rolling with the emulsion of the present invention was comparable to that obtained with conventional emulsions.

Roll coating measurements were performed as follows: The Plexiglas gasket article was attached to the center of the top work roll and sealed. This article contained a reservoir covering an area of 20.26 cm ² of roll surface. 15 ml of 2.1 N sodium hydroxide was injected into the reservoir where it was possible to react with the aluminum roll coating on the roll surface for about 5 minutes. 3. The caustic soda solution was then extracted from the reservoir via syringe and placed in a sample bottle. 4. It was washed twice with 15 ml of deionized water, extracted with a syringe and added to the sample bottle. 5. The total aluminum in the sample was measured by ICP. 6. The roll coating mass was then calculated and expressed in milligrams of aluminum per square centimeter of roll surface. Roll coating has been found to be better with the present invention than conventional emulsions.

[Brief description of drawings]

FIG. 1 shows the applied rolling force vs. the number of passes first with a conventional emulsion and then with the emulsion of the invention.

FIG. 2 is a diagram showing the applied net rolling force vs. the number of passages first with a conventional emulsion and then with the emulsion of the invention.

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Claims (15)

[Claims] 1. A hot rolling method for rolling aluminum and aluminum alloy sheets, comprising 1 to 80% by weight of di (2-ethylhexyl) based on the total weight of the base stock oil and the water-soluble oil composition. A method comprising applying an effective amount of an oil-in-water emulsion comprising a water-soluble oil composition comprising an adipate and water. 2. The water-soluble oil composition further comprises 0.05 to 20% by weight, preferably 0.1 to 5% by weight, of a nonionic surfactant, based on the total weight of the composition,
The hot rolling method according to claim 1, which preferably comprises an ethylene oxide addition polymer. 3. The water-soluble oil composition comprises from 3 to 3 parts by weight based on the total weight of the composition.
The hot rolling method according to claim 1 or 2, which contains 30% by mass of di (2-ethylhexyl) adipate. 4. The water-soluble oil composition further comprises 1-30% by weight, preferably 5-20% by weight, of oleic acid, based on the total weight of the composition.
The hot rolling method according to any one of 1. 5. The water-soluble oil composition further comprises a trialkanolamine (C _2-4 ), Preferably triethanolamine, for all binding trialkanolamines.
Mining is included in an amount such that it binds to the oleic acid moiety.
The hot rolling method described. 6. The oil-in-water emulsion comprises water and 0.5-30%, preferably 1-15% (v / v) water-soluble oil composition. The hot rolling method described in. 7. The hot rolling method is performed in a breakdown rolling mill, and
7. The hot rolling method according to claim 1, wherein the emulsion contains 2 to 4% by volume of the water-soluble oil composition based on the total volume of the emulsion. 8. The heat according to claim 11, wherein the hot rolling process is carried out in a finishing or tandem mill and the emulsion contains 5 to 7% by volume of the water-soluble oil composition based on the total volume of the emulsion. Hot rolling method. 9. A water-soluble aluminum and aluminum alloy hot-rolling oil composition, in a mass proportion based on the total mass of the composition: -0.1-0.5% of trialkyl (C _{1- 4)} phenol; -0.5～4.0% of trialkyl (C _3-10) phosphate ester; -5 to 15% of di (2-ethylhexyl) adipate; -5 to 15% of organic fatty acid (C _12-20); -0.5~2% of 5-carboxy-4-hexyl-2-cyclohexen-1
Octanoic acid; -1～3% of alkylene (C _2-6) glycol; -0.3～1% of ethoxylated alcohols (C _5-14, comprising 2-10 CH ₂ O groups); -2 ~ 5% trialkanolamine ( _C2-4 ); a composition comprising the balance of a mixture of naphthenic and paraffinic lubricating base oils. 10. The water-soluble oil composition according to any one of claims 1 to 9, wherein the base stock oil has a viscosity of 7 to 150 cSt at 40 ° C, preferably 20 to 50 cSt at 40 ° C. 11. A method of making a water-soluble oil composition according to claim 9 or 10, comprising blending the basestock and other ingredients under agitation or using any mixing equipment. . 12. Water and the water-soluble oil composition 0 according to claim 9 or 10.
． Oil-in-water emulsion containing 5-30%, preferably 1-15% (v / v). 13. A method of producing an oil-in-water emulsion according to claim 12, comprising diluting the oil composition in water with stirring. 14. A process according to claim 9 or 10 for producing an emulsion intended for use in an aluminum or aluminum alloy hot rolling process.
Use of the water-soluble oil composition described in. 15. Use of the water-in-oil emulsion according to claim 12 in a hot rolling process.