JPH03192197A - Water-soluble cold rolling oil composition for stainless steel sheet - Google Patents

Abstract

PURPOSE:To improve the surface gloss of a rolled steel sheet while maintaining excellent lubricating performance by incorporating a specified performance improver and dispersant into a base oil. CONSTITUTION:One or more base oils selected from among a mineral oil, oil or fat, and synthetic lubricating oil are mixed with 40-70 pts.wt. performance improver comprising a hindered ester (e.g. neopentyl glycol diester) and/or sulfurized oil or fat and 2-10 pts.wt. of one or more dispersants selected from among salts of amino compound/ethylene oxide adducts of formulas I and II (wherein R is 12-18C alkyl; (a+b) and (c+d+e) are each 5 to 20) so as to provide a total of 100 pts.wt.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides water for stainless steel sheets that can obtain rolled steel sheets with excellent surface gloss while maintaining excellent lubrication performance (that is, with extremely excellent surface gloss performance). The present invention relates to a soluble cold rolling oil composition.

INDUSTRIAL APPLICATION This invention is utilized in the industry which performs lubricant manufacturing, cold rolling processing, etc.

[Conventional technology]

In general, cold rolling oil compositions for low carbon steel use mineral oil, oil, synthetic ester, etc. as a base oil, and oiliness improvers, extreme pressure additives, rust preventives, antioxidants, surfactants, etc. This is used as a coolant in the form of an emulsified dispersion in water, and the rolling mill used is a tandem mill, reverse mill, etc.

On the other hand, in the case of cold rolling a stainless steel plate, a high rolling pressure is required because the rolled material has high deformation resistance and significant work hardening. Furthermore, the rolled product is required to have good surface gloss. Therefore, the rolling mill used in this rolling is a Sendzimir mill with small diameter work rolls that can obtain high rolling pressure, and the cold rolling oil is a water-insoluble cold rolling oil with low viscosity mineral oil as the base oil. Rolling oil is used. However, rolling with small diameter work rolls such as this Sendzimir mill has the problem of poor productivity because it involves reverse rolling, which increases the number of passes and limits the rolling speed.

Furthermore, when a water-soluble cold rolling oil is used in this small-diameter whirl roll rolling, although the rolling speed increases due to improved cooling properties, there is a problem in that a high degree of surface gloss cannot be obtained. Furthermore, nonionic surfactants are generally used as emulsifiers in this water-soluble cold rolling oil;
When it is circulated and supplied as a coolant, a non-uniform substance called "scum 1", which is a combination of wear powder and oil, is generated over time, and the rolling oil is not evenly distributed in the coolant. When supplied for rolling, there was a problem that the rolling oil was not uniformly introduced into the roll bite, resulting in a decrease in surface gloss.

To solve this problem, it may be possible to roll stainless steel sheets using a tandem mill, which has higher productivity than a Sendzimir mill. However, when stainless steel sheets with high deformation resistance and significant work hardening are rolled using work rolls with a diameter larger than that of a Sendzimir mill, the rolling load increases significantly, so cold rolling oil with poor lubrication performance, such as mineral oil-based oil, is used. Then rolling becomes impossible. Therefore, as a method to improve lubrication performance, it is necessary to use cold rolling oil based on fats such as beef tallow, which has better lubrication performance than mineral oil, adding an oiliness improver, or applying high viscosity cold rolling oil. arise. However, although such cold rolling oil has good lubrication performance, it also increases the amount of oil introduced between the rolled material and the work roll (i.e. roll bite), which causes oil pits on the surface of the cold rolled steel sheet. This increases the surface gloss of the product.

Furthermore, a cold rolling oil containing an esterification product of a methyl branched fatty acid and an aliphatic polyol (I Kaisho 62-290
No. 795), a cold rolling oil containing a base oil and a salt of an ethylene oxide adduct of a predetermined amino compound (JP-A No. 62-1
12695) also has the same problems as above.

In addition, a compound containing a specified organic sulfur compound and a specified emulsifying dispersant (Japanese Patent Application Laid-open No. 175097/1983),
Excellent lubrication performance and a certain degree of surface gloss performance can be obtained, but the surface gloss performance cannot be said to be sufficient. Furthermore, since the dispersants exemplified or used here are water-soluble or highly hydrophilic, the cited composition is in the form of two parts, the oil and the dispersant, and when used, they must be added to the tank separately. Therefore, supply management is complicated. Similarly, as rolling oil coolant (aqueous dispersion of rolling oil) is circulated and used for a long period of time, the amount of dispersant increases due to accumulation of dispersant in the coolant, so the particle size of the dispersed oil becomes finer. There are various problems such as a decrease in plate-out properties and a decrease in rolling lubrication performance.

From the above, in the cold rolling of stainless steel sheets, currently no water-soluble cold rolling oil has been found that satisfies sufficient surface gloss performance while maintaining high lubrication performance and is convenient for supply management.

[Problem to be solved by the invention]

The present invention provides a cold rolling oil that does not have the above-mentioned problems, that is, a stainless steel sheet water that satisfies sufficient surface gloss performance while maintaining high lubrication performance in water-soluble cold rolling of stainless steel sheets, and is convenient for supply management. It is an object of the present invention to provide a soluble cold rolling oil composition.

[Means to solve the problem]

As a result of extensive research into cold rolling oil components, compositions, etc. that affect the lubrication performance and surface gloss performance during cold rolling of stainless steel sheets, the present inventors found that one or two types selected from hindered esters and sulfurized oils and fats. Performance improver (II)
and a predetermined amount of a dispersant (III) consisting of one or two selected from the salts of the ethylene oxide adducts of the predetermined amino compounds shown above. The present invention was completed based on the discovery that it exhibits excellent performance as a cold rolling oil, particularly excellent surface gloss performance.

In particular, it has been found that the surface gloss performance can be significantly improved by adding a predetermined amount of the salt that is oil-soluble and has a surfactant structure (appropriate HLB) having a lipophilic part and a hydrophilic part as described above. It is.

That is, the water-soluble cold rolling oil composition for stainless steel sheets of the first invention contains lubricants selected from mineral oils, fats and oils, and synthetic lubricants.
A base oil (I) consisting of one or more types, a performance improver (II) consisting of one or two selected from hindered esters and sulfurized fats and oils, and the general formula (A) shown in claim 1.
and a dispersing agent (I
n), the base oil (I), the performance improver (■7
) and the dispersant (III) are 100 parts by weight, the amount of the dispersant (III) is 2 to 10 parts by weight. In the following, when these components are expressed with respect to the total amount, they will simply be referred to as % by weight instead of parts by weight.

The cold rolling oil composition of the second invention is characterized in that the amount of the performance improver (II) added is 40 to 70% by weight.

In the cold rolling oil composition of the third invention, the hindered ester is an ester consisting of one or more selected from neopentyl glycol diester, trimethylpropane triester, and pentaerythritol tetraester. It is characterized by

Examples of the "mineral oil" of the base oil include machine oil (for example, all machine oils listed in Japanese Industrial Standards (JIS) K2238), turbine oil (for example, all turbine oils listed in JISK2213), kerosene, light oil, and spindle oil. Oil, cylinder oil, liquid paraffin, etc. can be used. In addition, as the above-mentioned fat and oil j, fats and oils such as beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, and hydrogenated products thereof can be used. The "synthetic lubricants" include (a) polyolefins such as poly-α-olefins and polybutenes, (b) alkylene glycols,
Polyols such as polyoxyalkylene glycols, alkyl ethers thereof, polyols, polyphenyl ethers, and polyol esters, polyethers, or polyesters (iii) silicone oils can be used.

As the "hindered ester", for example, neopentyl glycol diester, trimethylolpropane triester, pentaerythritol tetraester, etc. can be used. The fatty acids to be esterified with these polyols include those having 8 to 1 carbon atoms, such as caprylic acid, 2-ethylhexylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid.
8 straight-chain fatty acids, mixtures of these straight-chain fatty acids, natural fat fatty acids such as coconut oil fatty acids, rice bran fatty acids, rapeseed fatty acids, beef tallow fatty acids, pork tallow fatty acids, etc. can be used. The amount of this hindered ester added is preferably 20 to 70% by weight. This is because if the amount added is less than 20%, sufficient surface gloss cannot be obtained during cold rolling of stainless steel sheets, and even if it exceeds 70% by weight, the effect will not change much and it will be uneconomical, which is not preferable.

The above-mentioned "sulfurized oil and fat" refers to sulfurized natural oils and fats such as beef tallow, soybean oil, lard, rapeseed oil, and rice bran oil, and is not a sulfide of something that is not an oil or fat. The amount of this sulfurized oil and fat added is preferably 5 to 50% by weight. This addition amount is 5
If it is less than 50% by weight, sufficient lubrication performance will not be obtained for cold rolling of stainless steel sheets, and if it exceeds 50% by weight, the lubrication performance will be excessive, causing slips during rolling, or surface damage due to reaction with the steel sheet surface. This is because stains may occur, which is not desirable. This sulfurized oil or fat is usually obtained by adding sulfur powder to natural oil or the like, causing a sulfurization reaction at a temperature of 150 to 220°C, and then removing impurities from the unreacted sulfur powder by purification such as clay treatment.

Further, the hindered ester and the sulfurized fat or oil may contain only one of them, or may contain both of them. The amount of this performance improver added is 40 to 70% by weight in the second invention. This is because within this range, as shown in the results of the following examples, particularly excellent lubrication performance and very excellent surface gloss performance are exhibited, and the balance is very good.

As the "dispersant", at least one of the "salts of ethylene oxide adducts of amino compounds" shown in the general formulas [A] and [B] is used. This salt is a component that acts to uniformly disperse rolling oil and wear debris.
), it has an effect on exhibiting excellent surface gloss that is not found in conventional surfactants (dispersants). In addition, since this has an appropriate HLB balance, it also has a stabilizing effect on the plate-out properties (water syneresis properties) of the coolant.

Examples of the ethylene oxide adducts of this amino compound include those commercially available as ethylene oxide adducts of amines such as coconut, beef tallow amine, lauryl amine, and oleyl amine, or coconut propylene diamine, beef tallow propylene diamine, lauryl propylene diamine, and oleyl propylene. Commercially available ethylene oxide adducts of diamines such as diamines can be used.

In this amino compound, the carbon number of R is set to 12 to 18 because if it is less than 12, the particle size of the particles dispersed in the rolling oil becomes too small, and the plate-out property of the coolant decreases, resulting in a decrease in rolling lubrication performance. This is because if it exceeds 18, the dispersion becomes poor and the surface gloss decreases. In addition, in this compound, a+b, c+d+e should be an integer of 5 to 20.If it is less than 5, the dispersion will be poor and the surface gloss will be reduced.
This is because if the diameter exceeds 1, the dispersed diameter becomes too small, the plate-out property of the coolant decreases, and the rolling lubrication performance decreases.

To produce the salt of the ethylene oxide adduct of the amino compound, the ethylene oxide adduct of the amino compound is generally reacted with an acid. Acids that can be used at this time include (a) phosphoric acids, boric acids, monoalkyl acid phosphates or dialkyl acid phosphates having 2 to 8 carbon atoms, (b) lower or intermediate mono-, di-, Oxycacyleponic acids (for example, fatty acids such as formic acid, acetic acid, propionic acid, octylic acid, dicarboxylic acids such as oxalic acid, succinic acid, malonic acid, or glycolic acid, lactic acid, α-oxybutyric acid, malic acid, etc.) (oxyacid) etc. can be used.

The amount of this dispersant added is 2 to 10% by weight. If the amount of the dispersant added is less than 2% by weight, the cold rolling oil composition will not be sufficiently dispersed in water and will not exhibit sufficient surface gloss performance.
If the weight percentage is exceeded, the particle size of the dispersed particles becomes too small,
This is because the lubricating performance of the cold rolling oil is impaired due to a decrease in plate-out properties (water syneresis properties). That is, within the above range, excellent lubrication performance is maintained and extremely excellent surface gloss performance is exhibited.

Other optional components can be used in the composition of the present invention as needed. For example, (a) higher fatty acids such as oleic acid, stearic acid, tallow fatty acid, oiliness improvers such as dimer acid and trimer acid, (b) phosphoric acid esters such as trialkyl phosphate, dialkyl phosphate, triallyl phosphate, etc. , extreme pressure additives such as phosphite esters such as trialkyl phosphite, dialkyl phosphite, and triallyl phosphite, (c)
2. Phenol compounds such as 6-di-t-butyl-p-cresol, antioxidants such as aromatic amines such as phenyl-α-naphthylamine, and anti-rust additives such as (d)sorbitane dioleate, etc. is exemplified.

The water-soluble cold rolling oil composition of the present invention is usually diluted with water before use. The concentration used is usually
It is 0.1 to 10% by volume.

[Effect]

The hindered ester used in this composition has excellent surface gloss performance. In addition, sulfurized oils and fats have excellent lubrication performance. In particular, since this sulfurized fat is a sulfurized fat or oil, it has even better lubrication performance than sulfides that are not fats and oils.

In addition, salts of ethylene oxide adducts of amino compounds represented by the predetermined general formulas [A, ] and CB) have an excellent dispersion effect and have the effect of dispersing rolling oil and wear particles in the working fluid. Furthermore, it has excellent surface gloss performance. That is,
This salt is cationic, and the size (amount) of R (lipophilic part, alkyl group) and polyethylene oxide part (hydrophilic part) of this salt are appropriate, that is, HLB
Since the salt is suitable, this salt has excellent dispersion properties and, in turn, excellent surface gloss performance.

Furthermore, with conventional highly hydrophilic dispersants, the plate-out properties of the coolant decrease during circulation, but this dispersant is oil-soluble and has an appropriate HLB, so it accumulates in the coolant and emulsifies. Does not upset the balance of dispersion.

Therefore, in this composition, the oil particle size does not change over a long period of time, so the plate-out property is extremely stable, so the rolling lubrication performance does not deteriorate, and the surface gloss performance is also stable. .

In addition, in the case of conventional water-soluble dispersants, two-part management of the oil and the water-soluble dispersant is required during use, but since this dispersant is oil-soluble, such two-part management is not necessary. Only one liquid is required, and supply management is extremely simple.

Moreover, in the present composition, various compounds having these useful effects are blended in an appropriately balanced manner.

Therefore, when this composition is diluted with water and used, the synergistic effect of the types of each composition and their respective composition ratios will result in excellent rolling lubrication performance in cold rolling of stainless steel sheets, and a high degree of post-rolling. A steel plate surface gloss of

5 Examples The present invention will be specifically explained below using Examples and Comparative Examples. The compositions of the present example and comparative example are shown in the table. The numerical values relating to this composition indicate parts by weight.

Each composition shown in the table (Examples 1 to 11, Comparative Examples 1 to
The performance test (rolling lubricity, surface gloss) in 8) was
The following method was used, and the results are shown in the same table.

(1) Evaluation of rolling lubricity ■Rolling test conditions Two roll diameter = 60φmm, polished with #1000 polishing paper Roll circumferential speed: 30 m/min 227 kgf Rolled material: SUS 304, plate thickness 0.80 mm.

Plate width 30mm Reduction rate = 1 pass 40%, 2 passes 30%, 3 passes 3
0%, 4 passes 30%, 5 passes 20% ■Coolant supply conditions Rolling oil concentration: 4.0% by weight Supply ffi; 1. 9mj! /min supply pressure:
2. OKg f/cm” Coolant temperature: 50 to 60℃ ■ Evaluation method of rolling lubricity Rolling load during 3-pass rolling (rolling load/plate width, Kgf/m
m) was measured and evaluated based on that value.

(2) Evaluation of surface gloss performance After 5-pass rolling, the steel plate was washed with a solvent (solvent naphtha), and the gloss at a light receiving angle of 50° was measured using a surface gloss meter, and the value was evaluated.

(3) Effects of Examples Comparative Examples 1, 5, 6 and 8 have excellent rolling lubricity but do not have sufficiently good surface gloss performance. In addition, in this comparative example, the amount of amine salt (dispersant) was as low as 1% by weight, and in comparative example 8, an ether-based nonionic dispersant was used instead of an amine salt. Furthermore, even if 15% by weight of this amine salt is added as in Comparative Example 7, the surface gloss performance is saturated. Also, Comparative Examples 2 to 4
Although the surface gloss performance was equivalent to that of the example, the rolling lubricity was poor.

On the other hand, all of the compositions of Examples 1 to 11 are excellent in rolling lubrication performance and sufficient surface gloss performance, and are thus useful as having both of these performances.

It should be noted that the present invention is not limited to what is shown in the above-mentioned specific examples, but can be variously modified within the scope of the present invention depending on the purpose and use. That is, various compounds other than those mentioned above can be used as the hindered ester and sulfurized oil and fat, and the type of salt of the predetermined ethylene oxide adduct can also be selected and used within a range that satisfies the above general formula. Further, the type of predetermined mineral oil and oil used as the base oil, and further the type of predetermined fatty acid used as the oiliness improver, can also be changed to those other than those mentioned above.

〔Effect of the invention〕

The water-soluble cold rolling oil composition for stainless steel sheets of the present invention is
Since it has the above-mentioned effect, it can maintain excellent rolling lubrication performance during cold rolling of stainless steel sheets, exhibit sufficiently excellent surface gloss performance, and maintain excellent plate-out properties for a long period of time. Therefore, the present composition has all of these excellent properties, making it extremely useful and unprecedented, allowing high-speed rolling, improving productivity, and providing high-quality stainless steel products. Furthermore,
It is very convenient to be able to manage the supply with one liquid.

Claims (3)

[Claims] (1) A base oil (I) consisting of one or more selected from mineral oils, oils and fats and synthetic lubricants, and a performance improver (II) consisting of one or two selected from hindered esters and sulfurized oils and fats. ) and the following general formula [A]
and a dispersing agent (I
II), the base oil (I), the performance improver (II) and the dispersant (III).
is 100 parts by weight, the dispersant (III) is 2 to 100 parts by weight.
A water-soluble cold rolling oil composition for stainless steel sheets, characterized in that the amount is 10 parts by weight. <General formula [A]> ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ <General formula [B]> (However, R in the formula represents an alkyl group having 12 to 18 carbon atoms, and a + b and c + d + e each represent 5 Represents an integer from ~20.) (2) When the base oil (I), the performance improver (II) and the dispersant (III) are 100 parts by weight, the performance improver (
The water-soluble cold rolling oil composition for stainless steel sheets according to claim 1, wherein II) is 40 to 70 parts by weight. (3) The water-soluble cold forming method for stainless steel sheets according to claim 1, wherein the hindered ester is an ester consisting of one or more selected from neopentyl glycol diester, trimethylolpropane triester, and pentaerythritol tetraester. Rolling oil composition.