JP7140396B2 - Hot rolling oil composition for aluminum and hot rolling method for aluminum - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot-rolling oil composition for aluminum used when hot-rolling an aluminum material such as an aluminum plate or an aluminum alloy plate, and a hot-rolling method for aluminum using the composition.

Conventionally, hot-rolling oil compositions for aluminum use refined mineral oil or the like as a base oil, oils and fats and fatty acids as oiliness agents, fatty acid soaps as emulsifiers, nonionic surfactants as emulsifiers, and sulfur-based poles as extreme pressure agents. A rolling oil composition containing a pressure agent, a phosphorus-based extreme pressure agent, etc. is often used. Mainly used for rolling.

In the above-mentioned conventional hot rolling oil composition for aluminum, if the content of oily agents such as fats and fatty acids is increased, the seizure resistance is improved to some extent, but the friction is reduced, resulting in poor bite and slip during rolling. There is a problem. In addition, even when extreme pressure agents such as sulfur-based extreme-pressure agents and phosphorus-based extreme-pressure agents are contained, seizure resistance is improved, but they cause offensive odors and may corrode pipes.

Patent Document 1 discloses a lubricating base oil comprising an ester obtained by reacting a hindered alcohol having a valence of 2 or more, an aromatic polycarboxylic acid and a monool. However, this lubricating base oil is used as a base oil for lubricating oils or a base oil for grease, and is used in large amounts as a main component of lubricating oil compositions and the like. In addition, this document does not describe or suggest hot rolling of aluminum. Furthermore, in the evaluation of the heat resistance of this base oil, the test temperature was as low as 200°C, which did not reach the temperature range during hot rolling of aluminum.

JP-A-2000-8061

An object of the present invention is to provide a hot-rolling oil composition for aluminum that is excellent in seizure resistance and biting property, can avoid offensive odors and corrosion of pipes, and has a good working environment in hot rolling of aluminum, and use of the composition. The object of the present invention is to provide a hot rolling method for hot rolled aluminum.

As a result of intensive studies aimed at achieving the above objects, the inventors of the present invention have found that the above objects can be fully achieved by blending a specific aromatic ester compound into the base oil. Furthermore, various examinations were carried out, and the present invention was completed.

The present invention provides a hot-rolling oil composition for aluminum and a hot-rolling method for aluminum, which are described below.

1. a base oil comprising refined mineral oil;
(A) a hindered alcohol having a valence of 2 or more, (B) an aromatic polycarboxylic acid, and (C) an aromatic ester compound that is a reaction product of a monool, and the aromatic ester compound A hot rolling oil composition for aluminum, which is added in an amount of 2 to 30 parts by weight with respect to 100 parts by weight of the base oil.

2. (A) at least one dihydric or higher hindered alcohol selected from the group consisting of neopentyl glycol, trimethylolethane, trimethylolpropane, trimethylolbutane, pentaerythritol, dipentaerythritol, and dehydration condensates thereof Item 1. The hot rolling oil composition for aluminum according to item 1, which is a seed.

3. (B) the aromatic polycarboxylic acid is phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, 1,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, and 1,4-naphthalenedicarboxylic acid; Item 3. The hot rolling oil composition for aluminum according to item 1 or 2, which is at least one selected from the group consisting of acids.

4. 4. The hot rolling oil composition for aluminum according to any one of items 1 to 3, wherein (C) the monool is at least one selected from monohydric alcohols having 12 to 24 carbon atoms.

5. (A) a hindered alcohol having a valence of 2 or more, (B) an aromatic polycarboxylic acid and (C) a monool are reacted at a rate of 1 to 6 moles of component (B) and ( 5. The hot-rolling oil composition for aluminum according to any one of items 1 to 4 above, wherein component C is 2 to 18 mol.

6. A method for hot rolling aluminum, comprising emulsifying and dispersing the hot rolling oil composition for aluminum according to any one of the above items 1 to 5 in water to form an emulsion and hot rolling an aluminum material.

7. 7. The method for hot rolling aluminum according to item 6, wherein the concentration of the emulsion is 1 to 20% by weight.

According to the hot rolling oil composition for aluminum and the method for hot rolling aluminum of the present invention, the following remarkable effects are exhibited.

(1) In the present invention, in a hot rolling oil composition for aluminum based on refined mineral oil, excellent fire resistance is achieved by blending a specific amount of a specific aromatic ester compound that has a small decrease in friction. It is possible to obtain a hot-rolling oil for aluminum having both sticking property and biting property.

The reason why the use of the specific aromatic ester compound provides excellent anti-seizure property and bite resistance is because (i) the aromatic ester compound is derived from the raw material, aromatic polycarboxylic acid; Since it has a structure with a benzene ring, there is little decrease in friction, and it tends to remain as inclusions between the rolling rolls and the aluminum material during aluminum hot rolling. (ii) the above aromatic ester compound. Because it can be designed so that it can withstand heat resistance up to about 350 ° C to 500 ° C, it is difficult for the rolling oil to run out of the oil film at the temperature of aluminum hot rolling (about 350 ° C to 500 ° C). It is considered to be a thing.

(2) The hot rolling oil composition for aluminum of the present invention has an action as an oiliness improver with little reduction in friction, and the addition amount of other oiliness improvement agents with high friction reduction is zero or small. can be suppressed, so that it is possible to avoid biting defects, so that a hot rolling method for aluminum with high productivity is provided.

(3) The hot rolling oil composition for aluminum of the present invention can suppress the addition amount of the extreme pressure agent to zero or a small amount, so that it is possible to avoid offensive odors and pipe corrosion. A rolling method is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline of the hot Timken test for evaluating the galling resistance in the hot rolling of aluminum.

Hot Rolling Oil Composition for Aluminum The hot rolling oil composition for aluminum of the present invention comprises a base oil comprising a refined mineral oil, (A) a hindered alcohol having a valence of 2 or more, (B) an aromatic polycarboxylic acid and ( C) contains an aromatic ester compound that is a reaction product of monol, and the amount of the aromatic ester compound added is about 2 to 30 parts by weight with respect to 100 parts by weight of the base oil. characterized by being

Base Oil As the base oil used in the present invention, any refined mineral oil that has been conventionally used in this type of rolling oil composition can be used. Specifically, any of naphthenic mineral oil, paraffinic mineral oil and aromatic mineral oil may be used. should be selected and used as follows. If the kinematic viscosity of the rolling oil exceeds 100 cSt, the amount of oil introduced to the friction surface increases, lowering the friction, thereby impairing the biting property and the anti-slip property, which is not preferable.

Aromatic Ester Compound The aromatic ester compound used in the present invention is obtained by an esterification reaction of (A) a hindered alcohol having a valence of 2 or more, (B) an aromatic polycarboxylic acid and (C) a monool. As an oiliness improver with little decrease in friction, it contributes to the improvement of seizure resistance and biting resistance in hot rolling of aluminum by blending with the base oil.

(A) a hindered alcohol having a valence of 2 or more, (B) an aromatic polycarboxylic acid and (C) a monool are reacted at a rate of about 1 to 6 moles of component (B) per mole of component (A). It is preferable that the amount of component (C) is about 2 to 18 mol.

(A) The hindered alcohol having a valence of 2 or more includes neopentyl glycol, trimethylolethane, trimethylolpropane, trimethylolbutane, pentaerythritol, dipentaerythritol, or dehydration condensates thereof. 1 type is used.

(B) Aromatic polycarboxylic acids include phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, 1,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, and 1,4-naphthalenedicarboxylic acid. acids, etc., and at least one of these is used.

(C) Monol is a primary or secondary alcohol having a hydrocarbon moiety of 12 to 24 carbon atoms, which may be linear or branched, and has a saturated or unsaturated chain. It is a chain monohydric alcohol. Specifically, for example, lauryl alcohol, secondary dodecanol, 1-tridecanol, isotridecyl alcohol, secondary tridecanol, myristyl alcohol, secondary tetradecanol, pentadecanol, secondary pentadecanol, Palmityl alcohol, secondary hexadecanol, heptadecanol, secondary heptadecanol, stearyl alcohol, isostearyl alcohol, secondary octadecyl alcohol, oleyl alcohol, eicosanol, docosanol, tetracosanol, 2-butyloctanol , 2-butyldecanol, 2-hexyloctanol, 2-hexyldecanol, 2-hexyldodecanol, 2-octyldecanol, 2-octyldodecanol, 2-octyltetradecanol, 2-decyldodecanol, 2-decyl tetradecanol and the like. At least one selected from these monoalcohols is used as the component (C).

The aromatic ester compound used in the present invention includes (A) neopentyl glycol as a dihydric or higher hindered alcohol, (B) trimellitic acid as an aromatic carboxylic acid, and (C) a monool. It is more preferable that it is a reaction product obtained by an esterification reaction using oleyl alcohol as each.

The addition amount of the aromatic ester compound used in the present invention is about 2 to 30 parts by weight with respect to 100 parts by weight of the base oil. It is necessary because it is superior to both. The amount of the aromatic ester compound added is preferably about 2 to 25 parts by weight, more preferably about 5 to 25 parts by weight, per 100 parts by weight of the base oil. If the amount added is less than 2 parts by weight, the seizure resistance will be insufficient. On the other hand, when the content exceeds 25 parts by weight, the same effect can be obtained up to about 30 parts by weight, but the effect hardly increases, which is not preferable in terms of cost.

Other components In addition to the base oil and the above-mentioned specific aromatic ester compound, the rolling oil composition of the present invention further contains various known additives such as emulsifiers, oiliness improvers, Extreme pressure agents, antioxidants, antifoaming agents, preservatives and the like can be added.

Examples of emulsifiers include fatty acid soaps such as oleic acid triethanolamine salts, anionic surfactants such as petroleum sulfonate sodium salts, nonionic surfactants such as polyoxyethylene lauryl ether, and benzalkonium-type surfactants. Examples include cationic surfactants such as ammonium salts, general polymeric dispersants, and the like. The content of the emulsifier in all components for producing the hot-rolled oil is preferably about 2 to 20% by weight. If the amount added is less than 2 parts by weight, it tends to be difficult to form a stable emulsion. tends to be

Oiliness improvers include, for example, fatty acids such as palmitic acid, stearic acid and oleic acid; oils and fats such as coconut oil, palm oil and soybean oil; Polyhydric alcohols such as alcohol esters, oleyl alcohol, and 2-ethylhexanol can be used. Since the specific aromatic ester compound, which is the rolling oil component of the present invention, acts as an oiliness improver, the content of other oiliness improvers in this aromatic ester compound is preferably less than 20% by weight. preferable. If the content of the oiliness improver, in addition to the above-mentioned specific aromatic ester compound, exceeds 20% by weight, the friction tends to be too low and the biting property tends to be hindered.

Examples of extreme pressure agents include sulfurized fats and oils, sulfurized olefins, tricresyl phosphite, zinc dialkyldithiophosphate, and the like. The content of the extreme pressure agent in all components for producing the hot-rolled oil is preferably less than 12% by weight. If the content exceeds 12% by weight, the odor becomes pronounced and the work environment deteriorates.

Examples of antioxidants include phenolic compounds such as 2,6-di-t-butyl-p-cresol and aromatic amines such as phenothiazine.

Antifoaming agents include, for example, mixtures of hydrophobic silica and PEG-type nonionic surfactants.

Examples of antiseptics include thiazoline-based agents such as 1,2-benzothiazolin-3-one and pyridine-based agents such as sodium pyridinethiol-1-oxide.

Coolant The hot rolling oil composition for aluminum of the present invention is used as a stock solution and emulsified and dispersed in water to form an O/W emulsion in which oil droplets are dispersed in water. The concentration of the emulsion is preferably about 1 to 20% by weight to cool and lubricate the rolling rolls. If the concentration of the emulsion is less than 1% by weight, the anti-seizure property will be insufficient, and if the concentration exceeds 20% by weight, the friction will be too low and the problem of poor bite will easily occur. Water used for emulsification and dispersion is not particularly limited, and may be, for example, pure water, distilled water, ion-exchanged water, tap water, well water, industrial water, or the like.

Further, the median diameter of the oil droplets of the hot rolling oil dispersed in the coolant is about 1 to 7 μm. As a result, lubricity during hot rolling can be appropriately enhanced, and the emulsion can be stabilized. If the median diameter of the oil droplets is less than 1 μm, a water vapor film is likely to form between the oil droplets in the coolant and the surface of the roll during hot rolling. Therefore, the amount of hot rolling oil supplied to the rolling rolls is insufficient, which may lead to a decrease in lubricity. On the other hand, when the median diameter of the oil droplets exceeds 7 μm, the oil droplets in the emulsion tend to float due to buoyancy, and in some cases, the hot-rolled oil and water may separate. A laser diffraction particle size distribution analyzer (eg, "SALD-2300" manufactured by Shimadzu Corporation) can be used to measure the median diameter of oil droplets.

Aluminum Hot Rolling Method In the aluminum hot rolling method of the present invention, an aluminum material is hot rolled using a coolant obtained by emulsifying and dispersing the hot rolling oil composition for aluminum of the present invention in water. It is to be rolled. The concentration of the coolant emulsion is preferably about 1 to 20% by weight.

The aluminum hot rolling method of the present invention includes emulsifying and dispersing the hot rolling oil composition for aluminum of the present invention in water, and hot rolling an aluminum material as an emulsion with various rolling mills including a tandem mill rolling mill. A hot rolling method for aluminum is preferred.

In addition, in the aluminum hot rolling method of the present invention, the method of supplying the coolant is not particularly limited. For example, a method of supplying from a nozzle using a circulating pump, manual supply such as brushing or oiling, and spraying can be used. Moreover, if necessary, the rolling oil composition of the present invention can be supplied by a direct method. Further, examples of the material of the aluminum material that is the rolled product include pure aluminum and aluminum alloys (3000 series, 5000 series, 6000 series, etc.).

EXAMPLES The present invention will be described in more detail below based on Examples and Comparative Examples, but the present invention is not limited by these Examples.

Examples 1-5 and Comparative Examples 1-10
Using the respective components shown in Tables 1, 2 and 3 below, hot rolling oil compositions for aluminum of the present invention and for comparison were prepared. In Tables 1 to 3, numerical values for each composition are expressed in parts by weight. Specific contents of each component in Tables 1 to 3 are as follows.

Refined mineral oil: A naphthenic mineral oil was used, and in each example, the kinematic viscosity of the rolling oil at a temperature of 40°C was adjusted to 40 cSt.
Aromatic ester compound: Reaction product obtained by esterifying 2 mol of trimellitic acid and 4 mol of oleyl alcohol with respect to 1 mol of neopentyl glycol Polyhydric alcohol ester 1: trimethylolpropane trioleic acid Ester polyhydric alcohol ester 2: Pentaerythritol oleic acid full ester Fatty acid: Phosphorus oleic acid extreme pressure agent 1: tricresyl phosphate (having a phosphorus content of 8 to 9% by weight)
Phosphorus-based extreme pressure agent 2: dioleylhydrozenphosphite (having a phosphorus content of 5 to 6% by weight)
Sulfur-based extreme pressure agent 1: Di-t-butyl polysulfide (having 8 carbon atoms and a total sulfur content of 39 to 40% by weight)
Sulfur-based extreme pressure agent 2: Sulfurized olefin (having 16 to 18 carbon atoms and having a total sulfur content of 19 to 20% by weight)
Emulsifier: Polyoxyalkylene glycol monoalkyl ether (having 12 to 16 carbon atoms)

The coolants obtained by emulsifying and dispersing the rolling oil compositions of Examples 1 to 5 and Comparative Examples 1 to 10 in water so that the emulsion concentration was 2% by weight were all O/W emulsions. rice field. Moreover, the median diameter of the oil droplets in each of the obtained coolants was within the range of 1 to 7 μm.

Next, the hot rolling oil compositions for aluminum obtained in Examples 1 to 5 and Comparative Examples 1 to 10 were subjected to a hot Timken test, a rolling test and a high temperature odor test. Each test method is as follows.

Hot Timken Test A hot Timken tester was used to evaluate the galling resistance of aluminum during hot rolling. FIG. 1 shows a schematic diagram of a hot Timken test for evaluating seizure resistance. In FIG. 1, 1 is a hot Timken testing machine, 2 is a roll, 3 is a test piece, 4 is a high-frequency heating coil, 5 is a thermocouple, 6 is a nozzle, 7 is a circulation pump, and 8 is The tank is indicated at 9, the dilution water at 9 and the stirrer at 10, respectively.

4 L of Yamatokoriyama city water is put into the tank 8 attached to the hot Timken tester 1 in FIG. , the rolling oil compositions of Examples 1 to 5 or Comparative Examples 1 to 10 were added so that the emulsion concentration was 2% by weight. While mixing the mixture of the dilution water and the rolling oil composition with the stirrer 10, the mixture was circulated for 10 minutes with the circulation pump 7 to form an emulsion and then tested.

Roll 2 is rotated at a speed of 200 rpm. The high-frequency heating coil 4 can heat the test piece 3, and the thermocouple 5 controls the temperature of the test piece at 450°C. When the test piece temperature reaches a predetermined temperature, a load of 50 kgf is applied to the test piece 3 to evaluate seizure resistance.

The test conditions for the hot Timken test are as follows.
Roll size: φ50mm×8mm
Roll material: HSS
Roll width direction surface roughness: Arithmetic average roughness Ra 2.0 to 2.1 μm (Riken corundum polishing cloth: particle size 30)
Roll rotation speed: 200 rpm
Test piece: aluminum alloy 5052 alloy (φ30 mm × 50 mm)
Test piece temperature: 450°C
Applied load: 50kgf
Test time: 3min
Coolant concentration: 2% by weight
Coolant temperature: 50-55°C

Evaluation of seizure resistance by hot Timken test: A test piece with a coefficient of friction of 0.30 or less within a predetermined test time was judged to be acceptable (no seizure). Moreover, when the coefficient of friction exceeded 0.30, it was determined to be unacceptable (with seizure). When seizure occurs, a sudden increase in torque occurs and the coefficient of friction exceeds 0.30.

The coefficient of friction μ is calculated by the formula μ=N/P×R. N, P, and R are the values of torque N [N·m], applied load P [N], and roll radius R [mm], respectively.

A rolling test was conducted using each rolling oil composition using a rolling mill for rolling test test to evaluate seizure resistance and biting resistance. The test conditions are as follows.
Roll size: φ150mm×200mm
Roll material: 3Cr special forged steel roll Width direction surface roughness: Arithmetic mean roughness Ra 0.3 to 0.4 μm (RIKEN corundum polishing cloth: grain size 100)
Rolling speed: 13m/min
Test piece: aluminum alloy 5052 alloy plate (plate thickness 5 mm, plate width 40 mm, length 500 mm)
Test piece temperature: 450°C
Reduction rate: 60%
Application method: Neat oil roll coat

Evaluation of galling resistance by rolling test: Arithmetic mean roughness Ra was measured in the width direction of the rolled sheet. The symbol "A+" is given when Ra is 0.8 μm or less, the symbol "A" when it is 0.8 to 1.0 μm, and the symbol "B" when it exceeds 1.0 μm. The cases with the symbols "A+" and "A" where Ra was 1.0 µm or less were judged to be acceptable (no seizure). In addition, the case of the symbol "B", which is the case where Ra exceeds 1.0 µm, was determined to be unacceptable (with seizure).

Evaluation of biting property by rolling test: The biting property of each rolling oil composition was checked during the rolling test. It was determined to be unacceptable when rolling was not performed stably due to the occurrence of

High Temperature Odor Test The rolling oil compositions of Examples 1 to 5 and Comparative Examples 1 to 10 were evaluated for odor generation at high temperatures. In the test, 1 cc of the undiluted solution of each rolling oil composition was dropped onto an aluminum alloy 5052 alloy plate (plate thickness: 5 mm, plate width: 40 mm, length: 100 mm) heated to 400°C. was sniffed and evaluated.

Evaluation of high-temperature odor test: A case where 4 or more people felt no discomfort and no problem was judged to pass, and a case where 2 or more people felt an unpleasant odor was judged to fail.

Tables 1 to 3 below show each formulation (parts by weight) and hot Timken test, rolling test and The test results of the high temperature odor test are shown.

As shown in Tables 1 to 3, the rolling oil compositions of the present invention of Examples 1 to 5 contained the refined mineral oil as the base oil, the specific aromatic ester compound of the present invention, and the emulsifier. Moreover, these contents are within the range specified in the present invention. Therefore, it is clear that the rolling oil compositions of the present invention of Examples 1 to 5 are superior to the rolling oil compositions for comparison of Comparative Examples 1 to 7 in seizure resistance between the rolling rolls and the aluminum alloy plate. be. Moreover, the rolling oil compositions of the present invention of Examples 1 to 5 exhibit less reduction in friction compared to the comparative rolling oil composition of Comparative Example 10, so it is clear that they are excellent in biting property. In addition, Example 4 is similarly excellent in seizure resistance and biting property as compared with Example 3, but since the content of the specific aromatic ester compound of the present invention is large, it is costly. I don't like it.

On the other hand, as shown in Tables 1 to 3, in Comparative Example 8, since the content of the specific aromatic ester compound is small, the seizure resistance is insufficient. Since Comparative Example 9 has a large content of sulfurized olefin, odor becomes a problem. In Comparative Example 10, since the content of pentaerythritol oleic acid full ester, which greatly reduces friction, is high, biting property is inhibited. In Comparative Example 10, since the aluminum alloy plate did not get caught and slip occurred, the seizure resistance could not be evaluated.

Since the hot rolling oil composition for aluminum of the present invention has both excellent seizure resistance and biting property, the productivity of aluminum rolled products is high. In addition, since bad smells and pipe corrosion can be avoided, and the working environment is favorable, it is preferably used in hot rolling of aluminum.

Claims (7)

a base oil comprising refined mineral oil;
(A) a hindered alcohol having a valence of 2 or more, (B) an aromatic polycarboxylic acid, and (C) a monool which is a reaction product of at least one monool selected from monohydric alcohols having 12 to 24 carbon atoms. and an aromatic ester compound, and the amount of the aromatic ester compound added is 2 to 30 parts by weight with respect to 100 parts by weight of the base oil. (A) at least one dihydric or higher hindered alcohol selected from the group consisting of neopentyl glycol, trimethylolethane, trimethylolpropane, trimethylolbutane, pentaerythritol, dipentaerythritol, and dehydration condensates thereof The hot rolling oil composition for aluminum according to claim 1, which is a seed. (B) the aromatic polycarboxylic acid is phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, 1,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, and 1,4-naphthalenedicarboxylic acid; The hot rolling oil composition for aluminum according to claim 1 or 2, which is at least one selected from the group consisting of acids. The aromatic ester compound uses (A) neopentyl glycol as a dihydric or higher hindered alcohol, (B) trimellitic acid as an aromatic carboxylic acid, and (C) oleyl alcohol as a monool, The hot rolling oil composition for aluminum according to claim 1, which is a reaction product obtained by an esterification reaction . (A) a hindered alcohol having a valence of 2 or more, (B) an aromatic polycarboxylic acid and (C) a monool are reacted at a rate of 1 to 6 moles of component (B) and ( The hot rolling oil composition for aluminum according to any one of claims 1 to 4, wherein component C) is 2 to 18 mol. A hot rolling method for aluminum, comprising emulsifying and dispersing the hot rolling oil composition for aluminum according to any one of claims 1 to 5 in water to form an emulsion and hot rolling an aluminum material. The hot rolling method for aluminum according to claim 6, wherein the concentration of the emulsion is 1 to 20% by weight.

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