JPS5949295A - Cold rolling oil for steel plate - Google Patents

Abstract

PURPOSE:To obtain a cold rolling oil for steel plate, having high heat deterioration resistance and removable easily after rolling process by alkali washing, by using a sulfurized oil obtained by adding sulfur to an oil or fat having a specific iodine value, as a main component, and adding an emulsifier to the sulfurized oil. CONSTITUTION:The objective oil for the cold rolling of steel plate can be prepared by adding >=0.3wt% of sulfur to an oil fat having an iondine value of <=100 (e.g. palm oil, beef tallow, etc.), and adding an emulsifier to the sulfurized oil. If necessary, the oil may be incorporated with 0.1-10wt% of an organic phosphoric acid ester (preferably dialkyl phosphate having 8-22C alkyl group) or 1-10wt% of a dimer acid or a trimer acid (e.g. derived from oleic acid, linoleic acid etc.) to improve the lubricity, or incorporated with <=40wt% of a mineral oil (preferably the one having a viscosity of 20-300cst) to improve the thermal deterioration resistance.

Description

[Detailed description of the invention] The present invention relates to cold rolling oil for steel plates.

Tin plate 4A steel plate or 1 [! ．． To improve plating properties of plated steel sheets such as lead-plated steel sheets, deposits on the surface must be removed by alkaline cleaning after cold rolling.

For rolling tinplate materials or lead-plated materials, rolling oils containing fats and oils such as beef tallow and gum oil as main components are often used because of their excellent lubricity. However, these rolling oils are affected by heat and deteriorate during rolling and on the surface of the rolled plate, making degreasing by alkaline cleaning difficult.

The circumstances are as follows.

When a plated steel plate is cold-rolled, the reduction amount per unit square is large and the rolling speed is high, so the temperature of the steel plate surface after rolling becomes extremely high due to plastic deformation heat and frictional heat. cold rolled,
Even after being wound into a coil, it remains in contact with air for a long time at a temperature of 0 to 200°C. Furthermore, during cold r-E rolling, a large amount of active abrasion iron powder is generated and adheres to the surface of the steel sheet. Since the rolling oil attached to the surface of the steel sheet is exposed to air (oxygen) at high temperatures for a long period of time, it undergoes oxidation and polymerization reactions, resulting in deterioration and deterioration, making it difficult to degrease by alkaline cleaning.

Active worn iron powder acts as a catalyst and accelerates this deterioration and alteration. If the rolling oil adhering to the steel plate after rolling is not sufficiently degreased by alkaline cleaning, it may cause plating defects in subsequent steps.

- Generally, antioxidants are added to beef tallow and palm oil to prevent such deterioration of rolling oil, but deterioration cannot be sufficiently suppressed.

Under these circumstances, there has been a long-awaited cold rolling oil for steel plates that causes less thermal deterioration and is easily degreased by alkaline washing after crushing.

(Objective of the Invention) An object of the present invention is to provide an oil agent that improves the washability of oil stuck to a steel plate after cold rolling and provides a clean surface of the steel plate.

(Structure of the Invention) The inventor discovered that a rolling oil whose main component is sulfurized oil, which is obtained by adding +1 sulfur to fats and oils, is resistant to thermal deterioration and has good alkali cleaning properties, and has completed the present invention. .

The fat and oil used for the sulfurized oil of the present invention has an iodine value of 100
The following are good, including palm oil and vegetable oil.
A Cedar oil, coconut oil, olive oil, etc. can be used, and as the animal oil, beef tallow, lard, mutton fat, etc. can be used. If the iodine value exceeds 100, thermal deterioration is likely to occur even if sulfur is added by +1, and the object of the present invention cannot be achieved.

In the cold rolling oil of the present invention, the amount of sulfur added to the sulfurized oil and fat is required to be above 03 weight plate based on the sulfurized oil and fat. Even if a sulfurized oil or fat containing less than 03% by weight of sulfur is used, the object of the present invention cannot be achieved because thermal deterioration is likely to occur.

It is also possible to improve rolling lubrication performance by adding organic phosphate esters, dimer acids, trimer acids, etc. used in conventional rolling oils to the steel plate cold rolling oil of the present invention.

Both phosphates and phosphites are effective as organic phosphoric acid esters, but those with a carbon number of 8 to 22 are preferable.
dialkyl phosphates and dialkyl phosphites with an alkyl group of However, since dialkyl phosphites have the disadvantage of being easily hydrolyzed, dialkyl phosphates are particularly advantageous. For rice to which organic phosphate esters have been added, the addition of more than 0.01 to 10 has no effect.

The dimer acid and trimer acid are typically those derived from higher aliphatic monoenoic acids or dienoic acids such as oleic acid and nolic acid, and industrially produced ones can be used.

Addition of dimer acid or trimer acid improves lubricity and reduces rolling load; however, if more than 10 times the rolling oil composition is added, thermal deterioration of the rolling oil composition is likely to occur, which is contrary to the purpose of the present invention.

Since mineral oil is less susceptible to thermal deterioration than oils and fats,
Can be blended with monobe oil, but 1 out of 110 is used for blending.
If you go beyond the 1i section, you will need it! /11 The smoothness is 1 degree lower, so it's not good.

Nails and oil must have a viscosity of 2() to 1:00 centistokes. If the viscosity of the mineral oil is less than 20 centistoc, the lubricity of the rolling oil will be poor.
(This is because once the 00 C/stoke is exceeded, the oil properties of the rolling oil deteriorate.

An emulsifier is blended in the same manner as the cold rolling oil V (conventional cold rolling oil) 11 of the present invention. The type of emulsifier, the use for blending, etc. may be the same as conventional rolling oil.

(Synthesis example of sulfurized fats and oils) (A-1) 90 parts of liver fat is placed in a reaction vessel and mixed at 110°C. Gradually add 10 parts of sulfur while introducing N2 gas. 165-170°C after adding sulfur. The temperature was raised to 25 hours, and the reaction was carried out for 25 hours.

This reactant is dripped onto a clean copper plate, and if it is inactive, the reaction is considered complete and cooled to 110°C.

Deodorize by supplying N2 gas at 110°C for 4 hours.

Next, 5 parts of activated clay was added and after stirring for 30 minutes, the mixture was sent to a filter press for filtration.

The sulfurized liver fat synthesized in this manner contains 92% sulfur.

(A-2) Sulfurized beef tallow synthesized in the same manner as in section A, -1 by adding 5 parts of sulfur to 95 parts of beef tallow contains a ratio of sulfur content/llI.

(Examples) In order to further clarify the content of the present invention, Examples and Comparative Examples are shown below, but the following Examples do not limit the present invention.

Table 1. ff1 (-3) Emulsification All A is pentaerythritol sesquioleate (Sumi-4) Emulsifier + 314 polyoxyethylene nonyl phenol ether (Note-5)
As for the antioxidant, 2-mercaptobenzimidazole was subjected to a heat resistance stability test and an alkali cleaning test on the following Examples and Comparative Examples. The test method is as follows.

(Code 3-1) Heat Resistance Stability Test Sample oil 202 was thoroughly mixed with 600 f of FO rotary chips, spread thinly on an enamel vat, and heat-treated at 130° C.-311 in a constant temperature dryer into which air was pumped. Thereafter, the sample oil sticking to the FOU chips is extracted with ethyl ether, and the oil content (viscosity degree, AV) is measured.

(11-2) Alkaline cleaning test Clean test piece (100100X100X1 SPC (,
, j-8L3) with sample oil. This test piece is
Heat treatment is carried out in a constant temperature dryer fed with 30°C-311 air. After cooling, the weight of the test piece is measured using a chemical balance to determine the amount of oil stuck.

Next, this test piece is immersed in an alkaline bath at 85° C. for 10 seconds using a 2-layer orno-silicate bath.

After lifting, wash in hot water (60'C) and dry. The weight of the cooling ridge is measured again, and the amount of cleaning for the oil deposited on Ima 1 is determined by calculation.

The test results are shown in Table 2 below.

Table 2

Claims (1)

[Scope of Claims] (1) A cold rolling oil for steel sheets, the main component of which is a sulfurized oil and fat made by subdividing sulfur 03 or higher into an oil with an iodine value of 1.00 or less, and containing an emulsifier. (2) The main component is sulfurized oil and fat obtained by adding sulfur 03 heavy weight plate (= 1) to oil and fat with an iodine value of 100 or less. A cold treatment for steel plate containing organic phosphoric acid ester 01 to 10 heavy weight acid and an emulsifier. Rolling oil. (3) Sulfur t110.
The main component is sulfurized oils and fats that have been subdivided into 3 parts by weight or more,
Viscosity at O'C is 20 to 300 centesto
Even if there is a lot of mineral oil in Kusu/LO City-,';A: $ 1
Cold-rolling oil for steel sheets that contains (~, and also contains an emulsifier)
The main ingredient is sulfurized oils and fats made from finely divided 4
A cold rolling oil for steel sheets, which contains at most 40% by weight of mineral oil having a Wm phosphate ester of 01 to 10% by weight and a viscosity of 20 to 300 centistokes at 40°C, and further contains an emulsifier. (5) The main component is a sulfurized oil or fat made by adding sulfur 03 or more to an oil or fat with an iodine value of 100 or less, and contains 1 to 10% by weight of dimer acid or trimer acid, and also contains an emulsifier. Cold rolling oil for steel plates. ((5) The main component is sulfurized fats and oils obtained by adding sulfur 03 weight plate to oils and fats with an iodine value of 100 or less, organic phosphoric acid ester 01 to 10 weight, dimer acid or trimer acid) to 10 weight weight. Cold rolling oil for steel sheets that also contains emulsifiers and emulsifiers. (7) Sulfur 0.3 in fats and oils with an iodine value of 1.OO or less
The main component is sulfurized oils and fats that have been finely divided by weight% or more, and 4 (]
A cold rolling oil for steel sheets containing at most 40 wt. . (8) Sulfur 03 in fats and oils with an iodine value of +00 or more
N) The main component is sulfurized fats and oils finely divided by i% or more, organic phosphoric acid ester 01 to 10% by weight, mineral oil with a viscosity of 20 to 30 () Cendestokes at /1 () °C, at most 40 Contains up to heavy @ staff, dimer l! I19
A cold rolling oil for steel sheets containing 1 to 10 tons of sludge or trimer acid, and further contains an emulsifier.