KR820001951B1 - Cold strip iron milling oil - Google Patents

Abstract

A mixt. of C6-12 aliphatic acid 70 wt.% and polyvalent alcohol 30 wt.% was reacted in the presence of KOH in N2 at 250-300≰C for 2 hr and finished at its viscosity 500-550 and acid value ca. 5 to give monoester (I) of polyvalent alcohol. I 0.1-1.5 part was mixed with mineral oil 70, emulsifier 30, surfactant 1 part, and a trace of antioxidant to give cold strip iron milling oil.

Description

Cold rolling oil

1 is a diagram showing the washability of cold rolled oil according to the present invention.

The present invention relates to cold rolled oil, in particular mill clean rolled oil.

It is well known that various rolling oils have been developed and marketed so far. For example, according to Japanese Patent Publication No. 48-17942, one or more selected from monobasic higher fatty acids having 10 or more carbon atoms having a melting point of 40 ° C. or lower, or a mixture of monobasic higher fatty acids having a main component thereof, and ethylene glycol and diethylene glycol. The cold rolled oil based on the diester synthesize | combined above can be obtained. This rolled oil has the advantage that it can be used at a low temperature (40 ° C.), but has a drawback that the alkali cleaning speed is slow and the degreasing action is insufficient, so that the surface of the rolled steel sheet is not clean, that is, the oil stain is generated during annealing. Thus, as described in Japanese Patent Publication No. 53-7174, cold rolled oil comprising a paraffinic oxide, an alkylene oxide adduct of olefin wax oxide, an oxidation product of α-olefin, an esterified product of alcohol, and the like Came to appear. However, this rolling oil, on the contrary, had a high melting point and thus had problems in use.

It is an object of the present invention to provide a new type of cold rolled oil, in particular, a mill clean rolled oil, in which the shortcomings of the conventional cold rolled oil are eliminated.

The object of the present invention is to react 70% by weight of fatty acid having 6-12 carbon atoms and 30% by weight of polyhydric alcohol at 250-300 ° C. for 2 hours in a nitrogen gas atmosphere in the presence of caustic catalyst, and then viscosity 500-550, acid value. It is achieved by adding and mixing 70 weight part of heavy-weight mineral oil, 30 weight part of emulsions, 1 weight part of surfactants, and antioxidant suitable quantity to 0.1-1.5 weight part of monoesters of the polyhydric alcohol obtained by terminating reaction in about 5.

Examples of fatty acids used in the present invention include C ₁₀ -C ₁₂ as a type of fatty acid in consideration of lubricity and milk cleanness in linear saturated alkynoic acid such as capric acid, caprylic acid, capric acid, lauric acid and myristic acid. Fatty acids and their monobasic and dibasic esters are selected. As the polyhydric alcohol, 5-6-valent alcohols such as arabinose, ribose, chisirose, mannitol, arabitol, chrysitol and sorbitol can be used.

Mineral oil that can be used in the present invention may be used a spindle oil and a machine oil of a medium degree having the following properties.

Appearance: Light yellow transparent liquid, Union: 3 ^(-) , Specific gravity (15/4): 0.910, Viscosity (5 ℃, cst): 33.0

Flash point: Above 200 ℃, Reaction: Neutral.

As an oily agent, what mixed 90 parts of fatty acid esters and 10 parts of fatty acids can be used. Fatty acid esters include palmitic, stearic, oleic or linoleic esters of methyl, ethyl, propyl or butyl alcohol.

The fatty acid uses a mixture of saturated fatty acids such as palmitic acid or stearic acid and unsaturated fatty acids such as oleic acid or linoleic acid (1: 1). The composition and properties of such an oily agent are as follows.

Surfactants are used for emulsification purposes, and may be selected from mono, di, or triethanol amine soaps, alcohols or alkylphenol oxide adducts and fatty acid esters of ethylene oxide. Polyethyleneglycol monostearate is preferred as a surfactant.

The liquid monoester prepared for use as a base in the present invention is nonionic and has a high hydrophilicity as well as a low molecular weight fatty acid ester as compared to the cold rolled oil of the prior art.

Therefore, the cold rolled oil prepared by the present invention has good cleanliness, so that no oil stain is generated in the steel sheet drawing during annealing.

When the present invention is described as an embodiment as follows.

Example 1 Preparation of Base

Sorbitol 300g was added to 800 g of lauric acid, and 10 ml of 0.01 N NaOH was added thereto, followed by reaction at 300 ° C. for 24 hours while injecting nitrogen gas in an amount of 100 cc / min. It confirmed that the viscosity was 520cst, and obtained 1045 g of lauric acid ester of the sorbitol which is a target product (yield: 95%). The properties of this ester were as follows.

Example 2 Preparation of Cold Rolled Oil

The base compound obtained in Example 1 was blended as follows and the properties thereof were observed.

Example 3

(A) General lubricity test

* Friction coefficient: soda pendulum type planetary tester.

** Pressure resistance: Soda type four ball friction tester (200rpm).

(B) emulsification stability test

(1) Test Method: Emulsify the sample oil in a homo mixer under the following conditions, put it in a 200 ml (350 mm) dropping funnel, leave for a predetermined time, and then take 100 ml of the lower layer to determine the oil concentration.

(C) Test for the degree of deterioration of residual oils due to iron in the working liquid:

5 w / o iron is added to 5% of the emulsion, and the mixture is left at 80 ° C. for 3 hours. Thereafter, the residual oil is extracted.

(D) Detergency test

(1) Water washing: 1.0 kg / cm ² of water was sprayed on the steel sheet rolled at 60% reduction rate for 5 seconds in the vertical direction, and then plated with 5% copper sulfate aqueous solution to observe the residual state of oil.

(2) Electrolytic cleaning: The above-described steel plate was electrolytically cleaned under the following conditions and plated with 5% copper sulfate aqueous solution to observe the residual state of the oil.

Condition: Composition of the cleaning bath: 2.0% normal oxygen solution, temperature of bath (℃): 80, Cleaning time (seconds): 5

Current density (A / dm ² ): 5

Compare results:

Ⓞ: Extremely good △: Normal ○: Good ×: Poor

(3) Milk cleanability: After rolling using a 5% emulsion, heat treatment is carried out at 120 ° C. for 24 hours, and annealing is carried out under the following conditions. After annealing, the cleanliness of the steel sheet was observed.

Condition: Gas atmosphere: N: H = 95.5, Gas flow (m / hour): 0.2, Temperature rise rate (℃ / min): 5

Storage temperature (℃): 600, Storage period (minutes): 120.

The cleaning property of the cold rolling oil of this invention observed above is the same as that of FIG.

Claims (1)

70% by weight of carbon atoms, 6-12 fatty acids and 30% by weight of polyhydric alcohol are reacted at 250-300 ° C. for 2 hours in a nitrogen gas atmosphere in the presence of a caustic catalyst, followed by reaction at a viscosity of 500-550 and an acid value of about 5 0.1-1.5 parts by weight of a monoester of a polyhydric alcohol obtained by terminating a middle-weight mineral oil, 70 parts by weight, 30 parts by weight of an oily agent, 1 part by weight of a surfactant, and an appropriate amount of an antioxidant are added and mixed.

Images