JPS61233087A - Cold rolling oil for steel plate - Google Patents

Abstract

PURPOSE:A rolling oil having improved coefficient of friction and pressure resistance even under high pressure and high-speed rotation, casing no contamination on the surface even if annealing is carried out without electrolytic cleaning when steel plate is rolled and annealed, having improved high mill cleaning properties, comprising a specific synthetic ester as a main component. CONSTITUTION:The aimed rolling oil containing an esterified product of a fatty acid (isooctylic acid, lauric acid, etc.) and a glycol (e.g., polyethylene glycol, polypropylene glycol, etc.), shown by the formula (R and R' are >=5C alkyl, alkenyl, hydroxyalkyl, or hydroxyalkenyl; X is ethyl, propyl, isopropyl, butyl, or isobutyl; n is >=1 integer).

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is a highly lubricating rolling oil that is excellent in friction coefficient and pressure resistance under high pressure and high speed rotation, and at the same time is electrolytically cleaned or treated during annealing after rolling. The present invention relates to a cold rolling oil for steel sheets that does not cause surface mK staining even if it is directly annealed without going through any other cleaning process, that is, it has excellent mill cleanliness.

[Conventional technology]

The cold rolling oils used during cold rolling of thin steel sheets are those based on animal or vegetable oils (beef tallow, lard, palm oil, coconut oil, etc.; all have triglyceride structure) and those based on mineral oil. It is broadly divided into those that do. In recent years, with the improvement of production efficiency such as energy saving and process saving, high reduction rolling, high speed rolling, and mill clean rolling are becoming popular. Rolling oils that use animal or vegetable oils as base oils are suitable for high-load, high-speed rolling, but if the oil deposits on a cold-rolled steel plate are annealed without degreasing, the steel plate surface will become contaminated during the annealing process. will occur. Oils and fats having a triglyceride structure have excellent lubricity, but are unsuitable for mill clean properties (direct annealing properties).

On the other hand, when rolling oil based on mineral oil is used for cold rolling of steel sheets, it does not cause surface stains even when cold thin steel sheets are directly annealed, and has excellent mill cleanliness. Poor rate rolling and high speed rolling properties.

In general, rolling oils based on mineral oils are made with animal/vegetable fats and fats, fatty acids (cagrilic acid, lauric acid, myristic acid, stearic acid, oleic acid, lylunic acid, etc.) or oils to improve rolling lubricity. Chemistry 173. November issue, P, 69
Improvement of oiliness of esters (synthetic esters such as monoesters and diesters/liol esters whose alcohol component is trimethylolgulonone, pentaerythritol, 2-xfh hexyl alcohol, etc.) as listed in 5-706. Although additives are added, the amount of these additives is adjusted within a narrow range to the minimum necessary to maintain mill cleanliness. As mentioned above, various studies have been carried out on cold rolling oils that simultaneously satisfy high lubricity and mill cleanliness.
5600, JP-A-59-80498) At present, sufficient performance has not been achieved.

[Problem that the invention seeks to solve]

The present invention is a cold rolling oil for thin steel sheets that contributes to improving production efficiency such as energy saving and process saving. It is also stable against chemical reactions.

In addition, during the annealing process, it produces less thermal decomposition residue of rolling oil than triglycerides and is easily volatilized, providing both surface cleanliness and high lubricity for the steel sheet.

[Means for solving problems]

The present invention is a cold rolling oil for thin steel sheets containing synthetic ester as a main component, which has high lubricity and high mill cleanliness, and is effective in rolling thin steel sheets and annealing the steel sheets after rolling without degreasing. This makes it possible to conduct

The synthetic ester referred to in the present invention is a diester compound that has been molecularly designed and synthesized for this purpose. In recent years, synthetic esters have been used as rolling oil additives or as base oils, but few of the synthetic esters currently used in cold rolling oils have been synthesized for this purpose, and are used in engine oils. Hydraulic fluids and oils are often selected from among existing synthetic esters used as other lubricants, and synthetic esters that can fully satisfy both high lubricity and high milk cleanliness do not have.

The synthetic ester of the present invention is suitable for use in cold rolling oil, that is, has characteristics of both high lubricity and high mill cleanliness, and has the following molecular design.

However, R, R': Alkyl, alkenyl, hydroxyalkyl, hydroxyalkenyl group having 5 or more carbon atoms. X: Ethyl, propyl, isopropyl, butyl, and isobutyl group. In the cold rolling oil for steel, which is characterized by containing a product, for example, R and R' in formula (1) are hexanoic acid, octylic acid, and decanoic acid derived from natural products. , lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, noglumitooleic acid, oleic acid, erucic acid, ricinoleic acid, 12-hydroxystearic acid, and the synthetic fatty acids inoctylic acid and nonanoic acid. ,
It consists of fatty acid residues containing one or more of inlauric acid, imiristic acid, isopalmitic acid, isostearic acid, and isoarachic acid.

X is selected from ethyl, propyl, inopropyl, butyl, isobutyl groups, and the like.

Glycol ethers used in the present invention include methyl glycol, ethyl glycol, propylene glycol, isopropylene glycol, butyl glycol, inbutyl glycol, phenyl glycol, methyl diglycol, ethyl diglycol, isobutyl diglycol, and ethyl diglycol. , isobutyl diglycol, methyl triglycol, methyl triglycol, hexyl glycol, hexyl diglycol, propylene glycol monomedel ether, siglopylene glycol 7-methyl ether, propylene glycol, monopropyl ether, etc. can be used.

In addition, in the present invention, the number of carbon atoms in R and R' in general formula (1) is set to 5 or more because an ester compound having less than 5 carbon atoms improves the lubricity to a small extent when cold rolling a steel plate. It is.

There are no restrictions on the upper limit of the number of carbon atoms and the number of n, but the carbon number is 29 or less, and the n number is 30 or less, preferably 20 or less, both of which are generally available industrially at low cost. Good. If the n number becomes larger than this, the compound will solidify due to the increase in molecular weight, and it cannot be used alone as a rolling oil, and even if it is used in combination with other base oils, it will have a negative effect on annealing properties. Therefore, in order to create a rolling oil that satisfies both lubricity and annealing properties,
The number of carbon atoms in R and R' in formula (1) is preferably 29 or less, and n = 2
A range of 0 or less is more preferable.

The synthetic ester compound obtained from fatty acid and glycol ether of the present invention is intended to be used as a rolling lubricant for steel plates, and its molecular design has been carried out taking into consideration the necessary conditions. Oils or oils that are essentially different from those used as additives,
It has excellent rolling lubricity and direct annealing properties for steel plates.

When using the synthetic ester of the present invention in rolling oil,
Synthetic esters can also be used alone as rolling oil. It can also be used in combination with other base oils, such as mineral oils and animal/vegetable oils.

It is also possible to add an emulsifier to these and use them as emulsions. It can also be used in combination with other fatty acids, antioxidants, corrosion inhibitors, emulsifiers, etc. that are commonly used as feed-batch agents in practical rolling oils.

When the synthetic ester compound of the present invention is mixed with other base oils, effects can be seen with addition of 1% by weight or more; By doing so, the characteristics become stable.

An example of a method for synthesizing the ester compound of the present invention from a fatty acid and a glycol ether is shown below, but the present invention is not limited to this method, and other conventionally known synthesis methods such as acid chloride It is also possible to use known synthesis methods such as the method.

〔Example〕

Next, examples of the present invention will be illustrated by giving reaction examples.

4 equipped with a stirrer, thermometer, nitrogen gas blowing pipe, and water separator
2.2 mot of inoctylic acid in a Tulo flask.

Polyethylene glycol (average molecule i600) 1 mot
0.2% of the total charged amount of para-toluenesulfonic acid was added as a catalyst, and 5% of the charged amount of xylene was used as a reducing solvent and stirred well. The mixture was heated at 160 to 230°C until the calculated amount of water was dissolved The reaction was carried out until the solution accumulated in the separation tube. The required time was about 8 hours. After the reaction was completed, the catalyst was removed by washing with water, and unreacted isooctylic acid was distilled off at 160° C. and 3 torr, followed by decolorizing filtration using activated clay to obtain a yellow liquid. The yield of the obtained synthetic ester compound was 88
%, the acid value was 0.2 and the saponification value was 123.

Synthetic esters were produced in the same manner using different types of fatty acids and glycol ethers. The properties of the obtained synthetic ester compound are shown in Table 1.

Next, a practical example using the cold rolling oil of the present invention will be shown and explained in more detail.

Practical Example 1 A hot rolled pickled steel sheet was cold rolled and annealed using the synthetic ester shown in Table 1 solely as rolling oil. Lubricity and annealing properties during cold rolling were evaluated using the following methods. The results are summarized in Table 2, and the symbols A to ■ in the table are the same as in Table 1.

The evaluation for lubricity was 2.30. Using Ryu's hot-rolled pickled steel sheets, cold rolling was carried out 3 times to a thickness of 1.20 mg. After degreasing the steel sheets, each test rolling oil was added to n-hexane. The steel sheet was immersed in an oil bath diluted to 5.0% for a certain period of time, the solvent was volatilized, and rolling oil was applied uniformly and quantitatively to the steel sheet, which was subjected to cold rolling. The rolling load at a reduction rate of 45% was measured to evaluate rolling lubricity. In addition, the friction coefficient of each rolling oil was determined using a Bowden friction tester (load: 1, temperature: 100° C.), and the lubricity of the rolling oil was evaluated.

Regarding the evaluation method of annealing property of rolling oil, cold rolled steel plate (0,
8X80X100mm) Approximately 630 ml of each sample oil is applied to the surface.
An amount equivalent to 1n9/m2 was dropped using a microsyringe, and a cold rolled steel plate of the same size was placed on top.

After stacking several tens of steel plates in this manner, they were fixed with a narrow copper band to form a test material, and annealed in a small annealing furnace.

The heating conditions during annealing are sin x gas (H2: 5%), 1
In a 20wl/rn1n atmosphere, the temperature increase rate was set to 10℃/
The mixture was heated to a minimum of 600°C, held at 600°C for 1 hour, and then allowed to cool. Thereafter, cellophane chips were pasted on the surface of the steel plate, and surface deposits were collected, and this was smeared onto white paper to visually determine the degree of contamination, and the cleanliness of the steel plate surface was evaluated.

The results of the evaluation of rolling lubricity using a single component rolling oil, the measurement results of lubricity using a Bowden friction tester, and the test results of direct annealing properties are summarized in Table 2.

Practical Example 2 Obtained when the synthetic ester, which is the rolling oil of the present invention, is blended with mineral oil or n-made beef tallow used as the base oil for practical rolling, emulsifiers, fatty acids, antioxidants, etc. that are commonly used as additives. The fluffiness and annealing properties of the rolling oil composition were evaluated in the same manner as in Practical Example 1. Emuln run rolling was performed using a two-roll rolling mill).
%.

The rolling lubricity' was evaluated by measuring the rolling load at a rolling reduction of 40% at a bath temperature of 50°C. Regarding annealing properties, tens of steel plates rolled with the test emulsion were piled up, fixed with a narrow copper band, and annealed in a small annealing furnace. The annealing conditions are the same as in the case of using rolling oil alone in the practical example described above. The method for determining surface cleanliness is also the same.

〔Effect of the invention〕

The rolling lubricating oil containing the esterified product of fatty acid and glycol of the present invention has excellent rolling lubricity and annealing properties for steel plates, enables high rolling reduction and high speed rolling, and contributes to improved productivity. At the same time, it is possible to reduce surface stains on the obtained steel plates. In particular, with regard to lubricity, the diesterized product of the present invention is more effective than the monoesterified product synthesized by the reaction of fatty acid and glycol.

Agent Akio Taniyama '°゛-fu-fu-... Procedural amendment 27th day of 1999, 2nd year of Showa n. Relationship with Case No. 74-7?7 Applicant Address (Residence) ) Come to Kyoto, Chiyom-ku, Ote-Ai 2-chome-ro 6-3 (
Address of the agent: 330S, Marunouchi Shigesu Building, 6112 Marunouchi 2-chome, Chiyoma-ku, Tokyo Date of amendment order Color section 5 & contents of amendment Amended as shown in the attached document Amended the following matters in the specification of the present application I will do it.

Note 1, page 7, line 3, page 8, line 12, page 9, 8 from the bottom
7th line, 4th line from the bottom of page 10 and page 11 “Table 1”
The words ``silicol ether'' are corrected to ``cricor.''

2. On page 7, lines 4 to 14, the statement ``Methyl tallycol, .

"Ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, isopropyreciglycol, dipropylene glycol, diisopropylene glycol,
3 , on page 8, lines 5-6, the phrase "solidification by increase" is corrected to "increase or solidification."

Procedural amendment Mingshog/April/Year

Claims (2)

[Claims] (1) General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼...
(1) However, R, R': alkyl, alkenyl, hydroxyalkyl, hydroxyalkenyl group having 5 or more carbon atoms, X: ethyl, propyl, isopropyl, butyl and isobutyl group, n = fatty acid represented by an integer of 1 or more Cold rolling oil for steel sheets, characterized in that it contains an esterification product with glycol. (2) R and R' in general formula (1) are hexanoic acid, octylic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, palmitooleic acid, oleic acid, erucane acid, ricinoleic acid, 1
Each fatty acid residue of 2-hydroxystearic acid, isooctylic acid, nonanoic acid, isolauric acid, isomyristic acid, isopalmitic acid, isostearic acid, isoarachic acid, X is an ethyl or/and isopropyl group, n is 1 to
The cold rolling oil for steel sheets according to claim (1), which is an integer of 20.