CS264409B1 - Mixture for preparing baths for drawing steel wires for steel cords - Google Patents

Abstract

The bath preparation composition contains as ingredients oleic, phosphoric and salicylic, petroleum oil, triethylene glycol, triethanolamine, ethylenediamine, ethoxylated alkylphenol, a chelating agent, an alkaline sodium metasilicate detergent, sodium hydroxide and water. The bath makes it possible to achieve a reduction in energy consumption and drafts when drawing, while the drawn wires have increased adhesion to the rubber. The bath itself is dermatologically harmless.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base composition for the preparation of a lubricating bath for drawing high-strength steel wires, in particular wires intended for steel cord production.

The drawing of high strength steel wires, especially small diameter wires intended for the production of steel cords, presents a difficult technological problem.

The wires are usually brass or galvanized prior to drawing and this coating must not be damaged by drawing, as its quality is of great importance for the protection of the cord against corrosion and for the adhesion of the cord to the rubber. High adhesion is then essential for the technical properties of rubber products with steel cords, such as tires or conveyor belts. Although the issue of adhesion can be solved by the use of rubbers containing adhesion enhancers, as most recently described in the Czechoslovak inventions AO 222 736 and AO 222 737, the drawing method and lubrication bath used therein are of great importance for achieving the desired results. This is because, where appropriate, expensive adhesion enhancing additives can be saved. When assessing lubricants, we often assure that baths with good lubrication effect positively influence the drawing process itself, but reduce the adhesion of the rubber to the cord.

The oldest known lubricating baths for drawing small diameter steel wires were essentially sodium soap solutions or calcium soap dispersions, for example stearates. These baths do not allow work at higher drawing speeds and the service life of tools, sintered carbide dies, ceramic materials or diamonds is low. Even adhesion is not satisfactory.

Many efforts have been made to improve the properties of the drawing baths. One such solution represents the older MS. The invention AO 140 443 according to which the wires are drawn in a bath prepared essentially from sodium stearates and sulphated castor oil. However, these baths do not have the necessary durability, which is probably due to the poor resistance of the sulfated oil to hydrolysis. To increase adhesion according to Κ. H. Jung (NS No. 2,108,210) add alkanolamine salts of mono- and diesters of phosphoric acid and fatty acid salts of alkanolamines or allylamines ethoxylated with 10 to 20 moles of ethylene oxide to the drawing emulsion. According to U.S. Patent No. 3,203,895, the properties of a base mineral oil from which a drawing bath is prepared are improved by the addition of a mixture comprising N-alkyl-1,3-diaminopropane, polyethoxylated alkylphenyl phosphate and acid alkyl orthophosphate, or salts thereof, respectively. According to U.S. Pat. No. 3,220,233, the basic substances are salts of fatty amines of at least 8 carbon atoms and fatty acids of at least 6 carbon atoms together with salts of fatty amines of at least 8 carbon atoms with acid alkyl phosphates. Nitrogen or phosphorus compounds or combinations thereof are also disclosed in more recent patents, such as U.S. Patent No. 4,053,426, wherein the main active ingredient is the triethanolamine salt of an alkenyl- or alkylsuccinic acid polyester with an alkenyl or alkyl having preferably 12 carbon atoms. Similarly, according to U.S. Pat. No. 4,260,499, the aqueous composition comprises, as the main active ingredient, in addition to the ethoxylated olein, a C 6 -C 8 alkyl phosphonate or an amine adduct thereof. All of these mixtures contain components subject to hydrolysis by water and thus chemically unstable.

With regard to the method of application of these mixtures in drawing plants, we do not intentionally mention cases where additives which are particularly harmful to health, such as certain sulfur compounds or halogen elements, are used to achieve the effect. These preparations are generally sold under trade names and their composition is not declared. In view of the high complexity of these mixtures, neither the analysis nor their composition can be detected safely by conventional methods of analysis. In the trial operation, we tested the application properties of a total of five commercial products, each of which showed some shortcomings. A very common defect was hygiene problems - eczema formation. Preparations that lubricated well impaired adhesion and vice versa.

The essence of our invention is that the drawing process takes place in a bath prepared by mixing 6 to 10% by weight. base emulsion in water. The composition of this base emulsion is described below. The main lubricating component is industrial oleic acid, which is a mixture of fatty acids of vegetable or animal origin, containing 70 to 80% by weight. % oleic acid, 3 to 10 wt. % linoleic and linolenic acids, 5 to 14 wt. % palmitic acid and palmitoleic acid, 1 to 2 wt. stearic acid and minor amounts of other fatty acids.

The masterbatch composition of the present invention comprises 90 to 125 parts of technical oleic acid described above, 20 to 28 parts of 55% phosphoric acid, 4 to 7 parts of sallcylic acid, 28 to 40 parts of oil having a dynamic viscosity of 4 to 10 mPa. 14 to 20 parts of triethylene glycol, 67 to 94 parts of ethoxylated C 8 -C 10 alkylphenol, preferably nonylphenol, ethoxylated with 4 to 8 moles of ethylene oxide, 1.5 to 2 , 1 part of sodium metasilicate alkaline detergent, 14 to 20 parts of ethylenediaminetetraootic or nitrilotriacetic acid sodium chelating agent, 20 to 28 parts of triethanolamine, 11 to 15 parts of ethylenediamine, 8 to 11 parts of sodium hydroxide and the rest to 1000 parts of water . Parts are by weight. The resulting pH of the emulsion produced by diluting 1 part of this masterbatch with 19 parts of water is in the range of 7.6 to 8.6.

In the preparation of the masterbatch, it is necessary to select a certain procedure for adding the individual components as described in the following example.

Example:

245 dm of water and 108 kg of oleic acid are pumped into the mixer.

Sodium hydroxide (10.0 kg), triethanolamine (24.0 kg), ethylenediamine (13.0 kg) were added successively with stirring and stirred for half an hour. When sodium hydroxide or ethylenediamine is used in the form of an aqueous solution, the amount of water pumped into the mixer is reduced by the amount contained in the solutions.

After stirring for half an hour, an additional 245 dm of water, sodium ethylenediaminetetraacetate 17.0 kg, bearing oil J-1 according to CSN 65 6610 34.0 kg, triethylene glycol 17.0 kg are added and mixed again for half an hour.

Thereafter, 21.0 kg of phosphoric acid is added slowly so that the temperature does not rise above 50 ° C by the heat of neutralization. After phosphoric acid, 5.7 kg of salioylic acid, 1.8 kg metasilicate detergent, 81.0 kg of ethoxylated nonylphenol and 178 dm of water were added. The whole batch is then stirred for at least two hours. The emulsion prepared by diluting 1 part of this base emulsion with 19 parts of water has a pH of 8.0 to 8.2.

The masterbatch is a non-Newtonian liquid which, at higher strain rates, has an apparent viscosity of less than 100 mPa · s, so that it pumps well. It is very easy to dilute to concentrations of 5 to 7%, which are used when drawing small diameter wires. The emulsion is hydorlytically stable as it results from its composition and does not contain any compounds which can be cleaved by the action of water. Experience has shown that it is dermatologically safe.

In comparative trials with other formulations, it was confirmed that it lubricated very well. The decrease in the electrical power input per pull unit was at least 0.5 kW compared to the best jig, a reduction in die consumption of at least 0.5 pieces per tonne of wire was achieved. This improved lubrication does not result in a decrease in adhesion, but has improved by at least 50 N.

In view of the known composition, it was possible to develop an applicable process for waste water treatment and waste disposal.

The mixture is suitable for the preparation of drawing baths especially for drawing brass or galvanized wires of high strength steel, the production of which has been tested for a long time. However, it is most likely to be used advantageously in less demanding drawing processes.

Claims (2)

OBJECT OF THE INVENTION CLAIMS 1. A composition for preparing a steel wire drawing wire bath comprising 90 to 125 parts by weight of industrial oleic acid, 20 to 28 parts of phosphoric acid 55%, 4 to 7 parts of salicylic acid, 20 to 40 parts of petroleum oils having a dynamic viscosity of 4 to 10 mPa.s at 50 ° C, 14 to 20 parts triethylene glycol, 67 to 94 parts of ethoxylated C 8 -C 10 alkylphenol, 1.5 to 2.1 parts of sodium metasilicate alkaline detergent, 14 to 20 parts of sodium chelating agent of ethylenediaminetetraacetic or nitrilotriacetic acid, 20 to 28 parts of triethanolamine, 11 up to 15 parts ethylenediamine, 8 to 11 parts sodium hydroxide and the remainder to 1000 parts water. 2. A process for preparing a composition as claimed in claim 1, wherein 30 to 40% of the total amount of water is mixed in the first stage, any technical oleic acid to which sodium hydroxide, triethanolamine and ethylenediamine are added sequentially after stirring for half an hour. stirring an additional 30-40% of the total amount of water, a chelating agent, petroleum oil and triethylene glycol, after a further half-hour stirring phosphoric acid, salicylic, metasllikate detergent, ethoxylated alkylphenol and finally the rest of the water. did not exceed 50 ° C and the resulting mixture was stirred for two more hours until complete homogenization. Severography, n. P., MOST