SU1294817A1 - Coolant for cold rolling of steel - Google Patents

Abstract

This invention relates to rolling production, in particular to coolant (coolant) for cold rolling steel strips. The aim of the invention is to improve the technological properties of the coolant and improve the quality of the treated surface. The coolant contains, in wt.%: Triztanolamine mince acids of tall oil 0,, 60; triethanolamine soaps of synthetic fatty acids of fraction 10 16 0.07-0.35; vegetable fat 0.03-0.15; interaction product at C acids of tall oil with triethanolamine 0.10-0.50; mineral oil 0.68-3.4; water the rest. The proposed coolant test results in a corrosion test that is stable to long; exposure and accumulation of hardness salts in it, has high lubricating properties. 6 tab. with GO so oo

Description

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The invention relates to the field of rolling production, and more specifically to coolant (coolant) for cold rolling steel sheets.

The aim of the invention is to improve the technological properties of the coolant and improve the quality of the treated surface.

To prepare the coolant, use tall oil, triethanolamine, synthetic fatty acids (FFA) fractions - C ,, mineral oil or distillate oil.

Mi, ina of synthetic fatty acids fractions C ,,., - C, 5, and acids of tall oil with triethanolamine are obtained by mixing a mixture of tall oil spray and synthetic fatty acids with triethanolamine.

The product of the interaction of technical tall oil acids with triethanolamine was obtained as follows: a mixture of 100 kg of technical tall oil and 15 kg of triethanolamine was heated with stirring at a temperature of 10-125 ° C until the acid number of the reaction mixture was set to not more than 30 mg KOH / g (10-20 h. The product of interaction has the following physicochemical data:

Acid number,

mg KOH / g29,7

The number of saponis,

mg KOH / G108,5

Pour point, ° С + 3

Solubility

in waterFull

Solubility

in mineral

oil-full

Viscosity

at 20.5

Research has shown that at a temperature below the reaction time, the reaction time increases significantly, and at temperatures above 125 ° C a product is formed that does not ensure the stability of the coolant with increased water hardness.

The introduction of triethanolamine soaps of synthetic fatty acids of the C, –C, g fraction provides an increase in the washing properties of coolant (reducing the amount of oil on the metal surface after rolling), and in a mixture with the product of the interaction of tall acids may

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la and triet anopam ioo o reduce foaming during intensive mixing.

The use of cotton, coriaid oil or palm oil as vegetable fat does not affect the studied properties of the coolant (stability, peo-formation and lubricant properties)

The proposed coolant is prepared in the following manner.

A product of the interaction of tall oil acids with triethanolamine, synthetic fatty acids of C fraction (Q - Ci (g, tall oil, vegetable fat (cotton, coriander or palm oil)) is loaded into the reactor with a sapka and heating, | The mixture is heated to 45-50 ° C and triethanolamine is added with stirring i, triethanolamine is added after an hour, and mineral oil is added after an hour.After stirring for 2 hours, the mixture is fed into a container, where it is mixed with water (condensate) until an emulsion is formed (, 5 -2 h)

The resulting emulsion is stable at; prolonged exposure at 60 ° C, does not form a stable foam when mixed. When prepared in hard water, it is stable to a hardness of 17 mg eq / l.

A test of the lubricating efficiency of the proposed coolant, and its fluid was carried out in a laboratory mill. The rolling of specimens with dimensions of 1.5x30x500 mm from steel was performed at a speed of 0.5 m / s. Rolls with a diameter of 200 mm from a clean surface 08 are made of steel 9 X F2. After rolling each batch of samples (5 for each lubricant), the rolls were flushed with gasoline, apetone, then wiped with filter paper.

The effectiveness of lubricants was evaluated by stretching (Kd is the ratio of stretching coefficients during rolling with emulsion and without lubrication), for which purpose rolling was carried out with constant installation of pressure screws. The studied cooling fluids were applied to the rolls during rolling.

We tested the compositions of the known cutting fluid (Table 1) and the proposed (Table 2).

The test results of the lubricant effectiveness of the compositions are presented in Table 3 ..

After rolling, the samples were cut into pieces with a length of 100 mm and the amount of oil on the surface after rolling was determined on them (by weighing before and after washing the samples with gasoline in Soxhlet apparatus (Table 3 data). Tests were performed with a rolling speed of 0.5 m / with a relative reduction of 27.0%,

From the data of Table 3, it can be seen that the lubricating ability of the proposed coolant with a significantly lower emulsion concentration is not inferior to that known. An increase in the concentration of more than 5.0% does not lead to an increase in lubricity, and a concentration of 10% or less is not as effective.

Determining the amount of lubricant on the surface of the samples after rolling showed that the proposed cutting fluid less pollutes the metal surface. This will favorably affect the improvement of the quality of the metal surface after annealing (reduction of the number of soot defects). ,

burner emulsion.

The test results on the stability of emulsions prepared in distilled water at 60 ° C are given in Table 4.

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3 hours at 60 ° C) are presented in

table.5.

The test results of lubricating and cooling liquids for foaming are presented in Table 6.

All the studied coolant systems withstand corrosion tests according to GOST (on steel and cast iron samples).

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Claims (1)

JO Invention Formula Cooling lubricant for cold rolling steel containing water, mineral oil, triethanol — mixed soap of tall oil acids and vegetable oil, which, in order to improve the technological properties of the liquid and the quality of the treated surface In addition, the lubricant additionally contains the product at 110-125 ° C of tall oil acids with triethanolamine and triethanolamine soaps of synthetic fatty acids, fractions.  in the following ratio components, wt.%: Triethanolamine soaps of tall oil acids 0.12-0.60 Triethanolamine synthetic fatty acid fraction Cf6 0.07-0.35 Vegetable fat 0.03-0.15 Interaction product at 110-125 C of tall acids May Table 2 Order 559/26 Draw 464 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 . 11rchi-P Dgtvekno-polygraphic enterprise, Uzhgorod, st. Project, 4 129481 / j5 T a b l and c 4 Table 6