JPH03265692A - Cold rolling oil for steel - Google Patents

Abstract

PURPOSE:To provide a cold rolling oil for steel which has good lubricating and annealing properties by using an active hydrogen-containing amine compound as the initiator and esterifying an adduct thereof with alkylene oxide with a fatty acid. CONSTITUTION:A compound of the formula (where R<1> is an alkylene; R<2> is an alkyl or alkenyl of 7C or above; 0.3<=l<=40; 1<=n<=3; and X is a residue of an amine compound having 1-3 active hydrogen atoms from which active hydrogen groups have been removed) is prepared. The compound is used alone or in combination with other base oil (e.g. mineral oil) and other additives such as an emulsifier, an antioxidant, etc., if required, to prepare a cold rolling oil for steel. The compound of the formula is obtained by adding an alkylene oxide (e.g. propylene oxide) to an amine compound having 1-3 active hydrogen groups (e.g. monoethanolamine) and esterifying the addition product with a fatty acid (e.g. stearic acid).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-speed mill clean rolling oil, that is, a cold rolling oil for steel that is excellent in both lubricity and annealing properties.

[Prior Art] In cold rolling of steel sheets, a method of directly annealing the steel sheet by omitting the degreasing step after rolling has become popular for the purpose of reducing costs in terms of process and energy. In such cases, the rolling oil must have the ability to disappear during annealing and leave no surface stains.

So-called mill-clean properties are required, and various mill-clean rolling oils have been developed. On the other hand, in recent years, the demand for thin steel sheets has increased, and in order to improve production efficiency, there has been a demand for faster cold rolling. Under the harsh conditions of high speed, high temperature, and high pressure, conventional mill-clean rolling oils have insufficient lubricity, so we use rolling oils that have both high mill-clean properties and high lubricity and can withstand high-speed rolling, so-called high-speed mills. Although the development of clean rolling oil is progressing (for example, Japanese Patent Application Laid-Open No. 135600/1983), the current situation is that sufficient performance has not been achieved.

[Means for Solving the Problems] The present inventors have discovered that a compound obtained by using an amine compound containing 1 to 3 active hydrogen groups as an initiator and esterifying the alkylene oxide adduct with a fatty acid has high milk cleanliness. They discovered that it has both high lubricity and completed the present invention.

That is, the cold rolling oil of the present invention has the following formula: It's okay. 1 is a number in the range of 0.3≦1≦40, n is an integer in the range of 1≦n≦3, and X is a residue obtained by removing the active hydrogen group from an amine compound containing 1 to 3 active hydrogens] It is characterized by the following.

In general formula (1), examples of R1 include ethylene group, propylene group, isopropylene group, butylene group, isobutylene group, and tetramethylene group.

R2 includes straight chain fatty acids such as hexanoic acid, heptanoic acid, octylic acid, nonanoic acid, decanoic acid, lauric acid, myristic acid, valmitic acid, stearic acid, arachidic acid, behenic acid, montanic acid, and side chain fatty acids. Some are isooctylic acid, isodecanoic acid, isolauric acid, inmyristic acid, invalmitic acid, isostearic acid, isoaracic acid.

It consists of residues of one or more mixed fatty acids such as oleic acid, with the carboxylic acid group removed.

X in general formula (1) is a residue obtained by removing active hydrogen from an amine compound containing 1 to 3 active hydrogen groups, but as an amine compound containing 1 active hydrogen group, N
, N-dimethylamine, N,N-dimethylmonoethanolamine, N,N-diethylamine, piperidine,
Examples include morpholine. 2 active hydrogen
Examples of the amine compound containing co-containing compounds include N-methylethanolamine, N-ethylethanolamine, N-methylgetanolamine, and 2-ethylhexylamine. Examples of the amine compound containing three active hydrogens include monoethanolamine, jetanolamine, triethanolamine, and impropaturamine.

In the general formula (1), 1 indicates the degree of polymerization of the polyether chain; if 1 is less than 0.5, the milk cleanliness increases;
Lubricity becomes poor. Moreover, when it exceeds 40, the mill cleanliness deteriorates.

Therefore, 1 is preferably in the range of 0.3≦1≦40, particularly preferably 0.5≦1≦30. Further, although the number of carbon atoms in R2 is limited to 5 or more, if it is less than 5, sufficient lubricity cannot be obtained.

When the compound of the present invention is used in rolling oil, it can be used alone or in combination with other base oils, such as mineral oil or animal or vegetable oil. In addition, an emulsifier can be added to these and used as an emulsion liquid. 1 When the oil of the present invention is mixed with other base oils, an effect is observed with addition of 1% by weight or more. By setting the content to at least 10% by weight, preferably at least 10% by weight, the effect is clearly manifested. Furthermore, the oil of the present invention can also be used in combination with antioxidants, emulsifiers, and corrosion inhibitors that are used as additives for mineral oils, animal and vegetable oils, etc., which are generally used as base oils.

An example of the method for synthesizing the oil of the present invention is shown below, but the present invention is not limited thereto, and other conventionally known synthesis methods can also be used.

(1) Synthesis of polyalkylene glycol using an amine compound as an initiator In a stainless steel pressure-resistant container equipped with a stirrer, a pressure gauge, and a thermometer, add 4 moles of monoethanolamine and 4 moles of KOH (purity 95%) as a catalyst. .3g under aN2 atmosphere,
After dehydration under reduced pressure at 120°C, 6 mol of propylene oxide was reacted at 110°C at a rate of 2 mol/Hr. After aging for 2 hours, the catalyst was decomposed and removed. Yield 97%, hydroxyl value 3
70 mg-Koo/g, acid value 0.006 mg-KO
It was H/g.

(2) Polyalkylene glycol esterification stirrer,
2 moles of the above polyalkylene glycol, 5.7 moles of stearic acid, and a titanium-based catalyst equivalent to 300 PPM of the total charge were charged into a 4-ton flask equipped with a thermometer, a nitrogen gas blowing tube, and a water separator, and the mixture was heated to 160 to 170 PPM. The reaction was carried out at ℃ for 10 hours while removing the produced water. Yield 9
3%.

Acid value 0.01 mg-KO)I/g, hydroxyl value 5.
It was 3 mg-KOH/g.

A steel plate was cold rolled and annealed using the synthetic ester shown in Table 1 solely as a rolling oil. The lubricity of the rolling oil was evaluated using a Bowden friction tester (load: 1 kg, temperature: 100° C.). The mill cleanliness of rolling oil was evaluated as follows. First, a sample oil in an amount equivalent to 630 mg/rrf was poured onto the surface of a steel plate, and a steel plate of the same size was stacked on top. In this way, 1 steel plate
After stacking 0 sheets, they were fixed and annealed in an annealing furnace. The heating conditions during annealing were HNx gas (125%) 120 m
The sample was heated to 500°C at a temperature increase rate of 10°C/11in in an atmosphere of 1/min, held at 600°C for 1 hour, and then allowed to cool. Thereafter, a cellophane tape was attached to the surface of the steel plate, and the matter deposited on the surface was collected, and this was pasted on white paper to visually determine the degree of contamination, which was used as an indicator of milk cleanliness.

As shown in Table 1, it can be seen that polyalkylene glycol ester compounds using amine compounds as initiators have excellent lubricity and mill cleanliness.

Claims (1)

[Claims] (1) General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (1) [In the formula, R^1 is an alkylene group, R^2 is an alkyl group with 7 or more carbon atoms, an alkenyl group, n R^2 may be the same or different. l is a number in the range of 0.3≦l≦40, n is an integer in the range of 1≦n≦3, X is active hydrogen from 1 to 3
A cold rolling oil for steel, characterized in that it is a residue obtained by removing active hydrogen groups from an amine compound containing: