JPH10279994A - Cleaning composition for rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cleaning agent capable of cleaning a rolling mill in a high efficiency and giving little influence on the rolling oil by compounding a higher fatty acid and an aliphatic amine to a main component selected from a mineral oil and a synthetic oil having respectively specific viscosity and flash point. SOLUTION: This composition contains (A) at least one kind of a mineral oil or synthetic oil having a viscosity of 2-15 mm<2> /s at 40 deg.C and a flash point of >=70 deg.C as a main component, (B) a higher fatty acid and (C) an aliphatic amine. The synthetic oil of the component A is e.g. an alkylbenzene and the component B is e.g. lauric acid or palm oil fatty acid and preferably a 16-24C fatty acid. The component C is preferably a 6-36C t-alkylamine such as trihexylamine. The contents of the components B and C in the cleaning agent are preferably 0.5-10 wt.% and 0.05-3 wt.%, respectively, before dilution. The objective cleaning agent is preferably used by diluting with water to a concentration of 2-5 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent for a rolling mill for cleaning dirt adhering around a steel rolling mill, ensuring safety around the machine, and contributing to prevention of flaws on the surface of the rolled material.

[0002]

2. Description of the Related Art Generally, dirt deposited on a rolling mill using a water-soluble rolling oil is composed of about half an oil agent such as a rolling oil and about half a fine powder of metal such as abrasion powder and scale. It is greased and hardened. these,
The dirt is black due to the large amount of fine iron powder, which impairs the aesthetics of the factory or when performing irregular work near the rolling mill.
Slippery and dangerous. Further, when dirt is scattered on the rolled material, irregularities are formed on the surface or roll of the material, and there is a problem that the surface quality of the rolled material is remarkably deteriorated. Conventionally, in regular cleaning of rolling mills,
In order to remove the dirt, warm water or a mixture of warm water and a detergent containing a surfactant as a main component has been used.

[0003] When hot water is used, the cleaning power is not sufficient. Therefore, a sufficient cleaning effect cannot be obtained unless a means such as intensively spraying the hot water to the dirt is used. In addition, when a detergent containing a surfactant as a main component is diluted with water and used, the detergency is much higher than that of warm water. However, even if the oil agent can be cleaned, the effect of cleaning the abrasion powder and scale that cause flaws is not sufficient. In addition, it is necessary to sufficiently rinse the cleaning agent remaining in the rolling mill, and if the rinsing is insufficient, the properties of the rolling oil change due to the cleaning agent remaining at the next rolling, and the rolling operation becomes unstable. There were problems such as becoming.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cleaning agent for a rolling mill which can efficiently clean the rolling mill and has less influence on the rolling oil by the cleaning agent.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus at 40.degree.
Viscosity ^{of, 2mm 2 / s ~15mm 2 /} s, rolling mill flash point as a main component at least one 70 ° C. or more mineral or synthetic oil, characterized and a higher fatty acid, that includes an aliphatic amine Is achieved by the following cleaning agents.

[0006]

Mineral or synthetic oils used in the present invention DETAILED DESCRIPTION OF THE INVENTION, the viscosity of 40 ° C., a ^{2mm 2 / s ~15mm 2 / s} , flash point may be any as long as more than 70 ° C. . Examples of the synthetic oil include alkylbenzene, polyalphaolefin, normal paraffin and the like.

The higher fatty acid used in the present invention preferably has 12 to 60 carbon atoms, more preferably 12 to 2 carbon atoms.
4, most preferably 16 to 24, saturated or unsaturated, linear or branched, monovalent or polyvalent. For example, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, erucic acid, ricinoleic acid, arachinic acid, behenic acid, montanic acid, palmito oleic acid, isolauric acid, isomyristic acid, In addition to isopalmitic acid and isostearic acid, tallow fatty acid, palm oil fatty acid, soybean oil fatty acid and the like can be mentioned. The higher fatty acid of the present detergent has a function of penetrating the base oil into dirt, particularly solid matter such as abrasion powder, and has a large carbon number, for example, 16 carbon atoms in order to sufficiently exert the cleaning effect of the present detergent. The above fatty acids are particularly preferred. In the case of fatty acids having 10 or less carbon atoms, the pH of the aqueous solution may be lower than 4, which undesirably increases the effect on the rolling oil. The amount of the higher fatty acid used in the detergent (before dilution with water) is preferably 0.1 to 20% by weight, more preferably 0.5 to 10% by weight.

[0008] The aliphatic amine used in the present invention forms a salt with higher fatty acids, and has an effect of uniformly dispersing the main component mineral oil or synthetic oil in large particles. Larger particles are more likely to adhere to dirt, thereby improving the cleaning effect. The aliphatic amine used in the present invention preferably has 6 or more carbon atoms, more preferably 6 to 60, particularly preferably 6 to 36.
And primary, secondary or tertiary amines, especially alkylamines. Examples include tripropylamine, diisobutylamine, di-n-butylamine, tri-n-butylamine, di-n-hexylamine, trihexylamine, dilaurylamine, stearylamine, oleylamine, dimethylstearylamine, dimethyloleylamine, and the like. In order not to affect the rolling oil, tertiary amines are more preferable, for example, tri-n-butylamine,
Particularly preferred are trihexylamine, dimethylstearylamine, dimethyloleylamine and the like. In addition, carbon number is 1
Six or more primary amines are also preferred. However, alkylamines and alkanolamines having 5 or less carbon atoms (such as propanolamine) disperse the main component too finely, so that they are not easily adhered to dirt, and the pH of the cleaning agent aqueous solution is raised to increase the rolling. It is not preferable because it affects oil. The amount of the aliphatic amine to be used is preferably 0.01 to 5.0% by weight, more preferably 0.05 to 3% by weight in the detergent (before dilution with water).

When the detergent of the present invention contains a surfactant,
The detergent particles are less likely to adhere to the stain, and the wear powder, which is a main component of the stain, cannot be sufficiently removed, which is not appropriate. The cleaning agent of the present invention is preferably used as a water diluent of 0.5 to 10% by weight, more preferably 2 to 5% by weight, and is sprayed on the entire rolling mill. The cleaning mechanism of this cleaning agent is
Although not fully elucidated, it is considered that the detergent component penetrates into the dirt component, and the dirt becomes softer and easier to remove, so that the dirt is removed along the flow of the detergent. Therefore, it exerts an excellent cleaning effect even on hard dirt deposited for a relatively long time.

[0010]

Examples Examples and comparative examples of the present invention are shown in Tables 1 to 3. Detergency was evaluated by removing dirt (called scum, oil = 48.2% by weight, iron = 45.7% by weight, water = 6.1% by weight) collected from an actual cold tandem rolling mill.
Attach 20g to 0x100mm steel plate, length 500mm,
Installed at the bottom of a gutter with a width of 150 mm and an angle of 30 °, a 3% by weight diluent of detergent, 50 ° C., 20 L was flowed from the top of the gutter at 5 L / min while stirring with an agitator at 1000 rpm. It returned and circulated for 1 hour, and the cleaning rate (%) was calculated | required from the amount of scum which remained in the lower steel plate. Also, ES
I (Emulsion Stability Index) was 400 ml of a 3% by weight water diluent, and 8
After stirring at 000 rpm for 3 minutes, the mixture was transferred to a separating funnel and allowed to stand for 8 minutes. The concentration of the lower layer (100 ml) and the upper layer (100 ml) were measured, and the ratio was determined by the ratio of the lower layer concentration to the upper layer concentration (lower formula). ESI = concentration of lower layer / concentration of upper layer

[0011]

Table 1 Example 1 Mineral oil ISO VG5 95-96.5--96 ISO VG8-95-96.5 90.0- ISO VG22 -----Higher fatty acid Oleic acid 4 4 3 3 9-Isostearic acid- − − − − 3 Palmitic acid − − − − − − − Aliphatic amine Oleylamine 11 − − − − − Dimethyloleylamine − − 0.5 − 11 Tributylamine − − − 0.5 − − Surfactant POE nonylphenol ether (HLB 13) − − − − − − Soil washability (%) 95 97 98 92 93 96 ESI 0.15 0.21 0.11 0.23 0.23 0.23 pH of 3% aqueous solution 5.9 6.0 5.9 6.3 6.2 6.5

ISO VG5 viscosity 5 mm ² / s flash point 130 ° C. ISO VG8 viscosity 8 mm ² / s flash point 140 ° C. ISO VG22 viscosity 22 mm ² / s flash point 168 ° C.

[0013]

Example 7 8 9 10 11 Mineral oil ISO VG5 94 92 96.9--ISO VG8---96.5 95.0 ISO VG22 -----Higher fatty acid oleic acid 45---Isostearic acid--3-- Palmitin acid - - - 3 4 aliphatic amine oleylamine - - - 0.5 - dimethyl oleyl amine 2 3 0.1 - 1 tributylamine - - - - - surfactant POE nonylphenol ether (HLB 13) - - - - - stain detergency (%) 94 98 99 92 96 ESI 0.23 0.22 0.11 0.27 0.15 pH of 3% aqueous solution 6.5 6.3 5.9 5.9 6.0

[0014]

Table 3 1 2 3 4 5 6 Mineral oil ISO VG5 95---93-ISO VG8-95---- ISO VG22 --- 95-- Higher fatty acid oleic acid 5-----Isostearic acid--- 4 3 - palmitic acid - - - - - - aliphatic amine oleylamine - 5 - - - - dimethyl oleylamine - - - 1 1 - tributylamine - - - - - - surfactant POE nonylphenol ether (HLB 13) - - 100 − 3 − Soil cleaning (%) 83 42 43 81 21 63 ESI 0.20 0.11 − 0.52 0.92 − pH of 3% aqueous solution 5.0 8.3 6.3 5.3 6.2 9.3

[0015]

The cleaning agent of the present invention can easily remove dirt deposited on the rolling mill, improve the working environment, and contribute to the improvement of the surface quality of the rolled material.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C11D 7:24 7:26 7:32)

Claims (3)

[Claims] The viscosity at 40 ° C. is 2 mm ² / s to 15 mm ² / s
A cleaning agent for a rolling mill, comprising, as a main component, at least one of a mineral oil and a synthetic oil having a flash point of 70 ° C. or higher, and containing a higher fatty acid and an aliphatic amine. 2. The cleaning agent according to claim 1, which is used as a water diluent of 0.5 to 10% by weight. 3. The cleaning agent according to claim 1, wherein the pH of the cleaning agent when diluted with water is 4 to 8.