JPH10121085A - Cold rolling oil composition for steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide good rolling property, excellent lubricity, improved heat resistance, and reusable, further excellent dispersibility of abrasion powder in oil, and abrasion powder by an electromagnetic filter. To provide a cold rolling oil composition that is easy to remove. SOLUTION: A base oil selected from a mineral oil and a synthetic oil includes a fatty acid ester (eg, an ester of polyoxyethylene sorbitol and a higher fatty acid having 12 to 18 carbon atoms) and a sulfonate (eg, an alkali metal sulfonate, an alkaline earth metal sulfonate). And a water-based cold-rolling oil composition containing 0.5 to 10% by weight of the cold-rolling oil composition for steel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling oil composition used for cold rolling of metals such as steel, and more particularly, to a cold rolling oil composition having excellent heat resistance and capable of easily removing abrasion powder in a continuous rolling process. Hot rolling oil composition.

[0002]

2. Description of the Related Art In recent years, with the development of mill-clean type rolling oil, it has become possible to omit acid cleaning before annealing, so that a cold rolling process can be changed from a batch type to a continuous type. Was. Such a continuous system is advantageous in terms of waste liquid treatment and economy. However, when the cold rolling step is performed continuously, the rolling oil used is required to be able to withstand long-term cyclic use. In particular, the rolled plate processed during rolling is instantaneously 300 ° C.
It can be as close as possible, and excellent heat resistance that can withstand this is required. On the other hand, in such a continuous process, abrasion powder generated at the time of rolling is mixed into the rolling oil, and when this is recycled and reused, there is a problem that the treated plate is stained. For this reason, it has been necessary to remove the wear powder mixed in from the rolling oil. However, as a conventional method for removing such wear powder, a scum-out method of removing the wear powder together with the emulsion oil has been required. There is a method called. However, such a scum-out method floats and wears the abrasion powder together with the emulsion oil, and removes the abrasion powder.
There is a disadvantage that the amount of rolling oil taken out is large and uneconomical. In order to improve the above-mentioned disadvantages, in recent years, a method of removing abrasion powder using an electromagnetic filter, particularly a method of removing the abrasion powder using the electromagnetic filter in a form of being dispersed in rolling oil, is economical. It is proposed in terms of gender. However, when the above-mentioned method is applied to various rolling oils conventionally used for cold rolling, the dispersibility of wear powder in oil is insufficient, so that removal of wear powder from rolling oil is insufficient. There was a problem. From such a point, a cold rolling oil excellent in dispersibility of wear powder in oil has been desired.

[0003]

The present invention has been made under such circumstances. That is, the present invention has good rolling properties, excellent lubricity, improved heat resistance, can be used repeatedly, and further has excellent dispersibility of wear powder in oil, and removal of wear powder by an electromagnetic filter. It is an object of the present invention to provide a cold rolling oil composition that is easy.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, by combining and blending a specific fatty acid ester and a specific additive with a base oil, the rolling property was improved. It has been found that a cold-rolled oil composition which is good, has excellent lubricity, has improved heat resistance, and further has excellent wear powder dispersibility in oil can be obtained. The present invention has been completed based on such findings. That is, the present invention provides a cold-rolling oil composition for steel obtained by blending a fatty acid ester and a sulfonate with a base oil comprising at least one selected from mineral oil and synthetic oil, and the cold-rolling oil composition described above. The present invention provides an aqueous cold rolling oil composition containing 5 to 10% by weight.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. Cold rolling oil composition for steel of the present invention, as a base oil,
Mineral oil or synthetic oil can be used, but the synthetic oil mainly has 1 carbon atom in view of imparting excellent rolling property.
It is preferable to use an ester composed of a higher fatty acid having 2 to 18 and an aliphatic alcohol having 1 to 8 carbon atoms. The higher fatty acids having 12 to 18 carbon atoms used herein include, for example, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, isostearic acid and the like. Inferior, 18
If it exceeds, the treated plate may be stained by annealing more often, which is not preferable. From such a point, palmitic acid or stearic acid can be particularly preferably used as the higher fatty acid. Examples of the aliphatic alcohol having 1 to 8 carbon atoms include methanol, ethanol, butanol, pentanol, hexanol, heptanol, and octanol, with butanol being particularly preferred.

The ester is obtained by esterifying the above higher fatty acid having 12 to 18 carbon atoms with an aliphatic alcohol having 1 to 8 carbon atoms. For example, butyl oleate, octyl stearate and the like can be used. In particular, in the present invention, a mixture of butyl stearate and octyl palmitate is preferably used. As the mineral oil, for example, a distillate obtained by distilling a paraffin-based, intermediate-based or naphthenic-based crude oil under normal pressure or reduced pressure is subjected to hydrogenation treatment, dewaxing treatment (solvent dewaxing or hydrogenation). Those subjected to various purification treatments such as dewaxing and solvent extraction, and those subjected to further deep dewaxing treatment can be used. The base oil is not particularly limited in viscosity, but generally has a kinematic viscosity at 40 ° C. of 5-1.
5 mm ² / sec, further preferably a 6 to 10 mm ² / sec. When the kinematic viscosity is within the above range, the surface glossiness of the rolled sheet does not deteriorate, and more preferable results are obtained. The base oil is usually contained in the composition of the present invention in an amount of 50 to 90% by weight. Further, within the above range, the above base oils may be used alone, but may be used in combination of two or more.

[0007] The cold-rolled oil composition for steel of the present invention is obtained by blending a fatty acid ester and a sulfonate with the above base oil. The fatty acid ester usable in the present invention is, in particular, polyoxyethylene sorbitol. And carbon number 1
Esters with 2 to 18 higher fatty acids are preferred. In the present invention, the fatty acid ester is mainly
It is blended for the purpose of improving the emulsion stability when mixed with water. Here, as a higher fatty acid having 12 to 18 carbon atoms forming a fatty acid ester,
It can be used irrespective of natural products and synthetic products. For example, lauric acid, myristic acid, palmitic acid, stearic acid,
Oleic acid, isostearic acid, and the like are listed. If the number of carbon atoms is less than 12, lubricity is inferior. If the number of carbon atoms is more than 18, stains on the processed material due to annealing may increase.
The polyoxyethylene sorbitol constituting the fatty acid ester has an ethylene oxide addition mole number of 6 to 6.
Preferably it is 60. If this value is out of the above range, heat resistance and the like may deteriorate. In the present invention, the fatty acid ester has an esterification rate of 50 to 100.
%. When the esterification ratio is lower than 50%, lubricity, heat resistance, etc. may be deteriorated. The esterification reaction can be performed using any conventionally known arbitrary method and means.

The fatty acid ester is preferably contained in the composition of the present invention in an amount of 0.1 to 5% by weight. If the above content is less than 0.1% by weight, the emulsion stability may be reduced and may not be suitable for practical use. If the content exceeds 5% by weight, the base oil component is relatively reduced and good. Rollability may not be exhibited. From this point, the content is 1 to
More preferably, it is in the range of 3% by weight. The fatty acid ester may be used alone or in a combination of two or more as long as the amount is within the above range.

In the present invention, the sulfonate is
It is used mainly for the purpose of improving heat resistance. As such a sulfonate, an alkali metal sulfonate, an alkaline earth metal sulfonate or the like is preferably used. Here, as the alkali metal sulfonate, any of various conventionally known alkali metal sulfonates can be used. In the present invention, a sulfonate of an alkali metal such as potassium or sodium is exemplified. As the alkaline earth metal sulfonate, any of various conventionally known alkaline earth metal sulfonates can be used. In the present invention, alkaline earth metal sulfonates such as calcium, barium, and magnesium are cited as preferable ones. Can be As the sulfonate, for example,
Alkali metal salts of alkyl-substituted sulfonated aromatic compounds are preferred, and such sulfonates having an alkyl group of 1 to 20 carbon atoms as a substituent are preferred. Specifically, dinonylnaphthalenesulfonic acid,
And heavy alkylbenzene sulfonic acid. The above-mentioned sulfonate is preferably contained in the composition of the present invention in an amount of 0.1 to 1% by weight. When the content is less than 0.1% by weight, the synergistic effect with the emulsifier is not sufficiently exhibited, and
If the content is more than 10% by weight, the viscosity of the composition increases and the rolling performance deteriorates. In this respect, the content is more preferably in the range of 0.1 to 0.5% by weight. The sulfonate may be used alone or in combination of two or more as long as the amount is within the above range.

The cold-rolling oil composition for steel of the present invention is obtained by blending each of the above-mentioned additives as an essential component with the above-mentioned base oil. An oiliness improver having a polar group together with a linear alkyl group in the molecule, such as an inhibitor or a fatty acid, alcohol, ester, or amine, can be contained. The addition of such an antioxidant improves the annealing properties, and the addition of the oiliness improver makes it possible to further reduce the rolling load, and more preferable results are obtained. From such a point, a phenolic antioxidant is preferably used as the antioxidant, and a fatty acid such as oleic acid is preferably used as the oiliness improver. The antioxidant or the oiliness improver is preferably contained in the composition of the present invention in an amount of 5% by weight or less.

The cold rolling oil composition for steel of the present invention further comprises, in addition to the above-mentioned additives, a corrosion inhibitor, a rust inhibitor, a cleaning dispersant, and a pour point within a range not to impair the object of the present invention. Various additives such as a depressant, a viscosity index improver, an extreme pressure agent, an anti-wear additive, an anti-fatigue agent, an antifoaming agent, and a coloring agent may be appropriately compounded. Although the composition of the present invention can be used as it is as a cold rolling oil for steel, it is preferable to dilute with water at the time of use and use it as an aqueous emulsion. Such an aqueous cold rolling oil is preferably an aqueous solution containing the cold rolling oil composition in an amount of 0.5 to 10% by weight, more preferably 1 to 10% by weight, particularly preferably 1 to 5% by weight.
Within the above range, a stable emulsion can be obtained and an optimum coefficient of friction can be maintained, and more preferable results can be obtained. The composition of the present invention is suitable as a rolling oil used for cold rolling for steel such as a steel plate, and can be preferably used for the continuous cold rolling process for steel. In particular, the cold rolling oil composition of the present invention can be more suitably used as a cold rolling oil composition for ordinary steel (normal carbon steel).

[0012]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. Examples 1 to 4 and Comparative Examples 1 and 2 Cold-rolled oil compositions having the compositions and blending ratios (% by weight) shown in Table 1 were prepared, and the following performances were evaluated for each of them. As a result, in the evaluation of dispersibility in abrasion powder oil, in Examples 1 to 4, no surface floating wear powder was observed, and in Comparative Examples 1 and 2, oil separation and floating wear powder were observed. The results of the heat resistance evaluation are shown in Table 1. The dispersibility of the cold rolling oil in the abrasion powder oil and the heat resistance were evaluated by the following methods. Performance evaluation method (1) Evaluation of dispersibility in abrasion powder oil A 3% aqueous emulsion of a test oil composed of the above-obtained cold-rolled oil composition was prepared, and iron powder was added thereto and placed in a metal container. Two steel balls were put and shaken at 300 rpm for 60 minutes. Thereafter, the appearance of the emulsion liquid and the floating state of the abrasion powder on the liquid surface were observed.

(2) Evaluation of heat resistance 20 g of a test oil composed of the cold-rolled oil composition obtained above was taken in a beaker and placed in a thermostat at 150 ° C. 4
After 8 hours, this was taken out and prepared into a 3% aqueous emulsion. Then, the ESI and the average particle size were measured and compared with those of the new oil. Here, ESI is a numerical value indicating the emulsion stability of the emulsion type water-soluble lubricating oil. The oil content of the upper layer 1/4 and the lower layer 1/4 of the emulsion is measured by the following method, and the lower layer portion is measured. It refers to a value obtained by dividing the oil content by the oil content of the upper layer portion. The average particle size is also a numerical value indicating the emulsion stability, and was measured by the Coulter counter method. Measurement of oil content 400 ml of the emulsion was placed in a prescribed emulsion separation cylinder, allowed to stand for a certain period of time, and then 100 ml of the lower layer and 100 ml of the upper layer were separated into oil measurement bottles, respectively, and saturated saline or concentrated sulfuric acid was used. Was added to break the emulsion, and the oil content to be separated was measured.

[0014]

[Table 1]

* 1: Paraffin-based hydrogenated refined mineral oil (4
Kinematic viscosity at 0 ° C. 90 mm ² / sec) * 2: Naphthene-based solvent refined mineral oil (kinematic viscosity at 40 ° C. 12 mm ² / sec) * 3: Paraffin-based hydrogenated refined mineral oil (kinematic viscosity at 40 ° C. 7 mm ² / sec) * 4: Ester of polyoxyethylene sorbitol (ethylene oxide addition mole number: 44) and oleic acid * 5: Oleic acid ethylene oxide addition product (ethylene oxide addition mole number: 4) * 6: Sodium dialkyl sulfosuccinate (alkyl group) * 7: Sodium sulfonate * 8: Calcium sulfonate * 9: 2,6-t-butyl-p-cresol * 10: Oleic acid

[0016]

As described above in detail, the cold rolling oil composition of the present invention exhibits good rolling properties, excellent lubricity, has improved heat resistance, can be used repeatedly, and further has abrasion resistance. It is excellent in dispersibility of powder in oil and facilitates removal of wear powder by an electromagnetic filter. Therefore, the use of the cold-rolled oil composition of the present invention can significantly reduce the amount of oil taken out in the process.

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Claims (9)

[Claims] 1. A cold-rolling oil composition for steel, comprising a fatty acid ester and a sulfonate mixed with at least one base oil selected from mineral oil and synthetic oil. 2. The cold rolling oil composition for steel according to claim 1, wherein the fatty acid ester is an ester of polyoxyethylene sorbitol and a higher fatty acid having 12 to 18 carbon atoms. 3. The cold-rolling oil composition for steel according to claim 1, wherein the sulfonate is an alkali metal sulfonate and / or an alkaline earth metal sulfonate. 4. The cold rolling oil composition for steel according to claim 3, wherein the alkali metal is selected from potassium and sodium. 5. The cold rolling oil composition for steel according to claim 3, wherein the alkaline earth metal is selected from calcium, barium and magnesium. 6. The steel according to claim 1, wherein the synthetic oil is an ester of a higher fatty acid having 12 to 18 carbon atoms and an aliphatic alcohol having 1 to 8 carbon atoms. Cold rolling oil composition. 7. The cold rolling oil composition for steel according to claim 1, wherein the synthetic oil is a mixture of butyl stearate and octyl palmitate. 8. A base oil comprising at least one selected from a mineral oil and a synthetic oil, wherein a fatty acid ester is contained in an amount of 0.1 to 5% by weight.
And a sulfonate in an amount of 0.1 to 1% by weight. 9. An aqueous cold-rolling oil composition containing the cold-rolling oil composition according to claim 1 in an amount of 0.5 to 10% by weight.