RU1786063C - Grease for plastic working of metals - Google Patents

Abstract

The inventive lubricant contains a mixture of monoethanolamine salts of synthetic fatty acids of the fractions and C21-C25 (in a mass ratio of 1:10, respectively) 25-35%, sodium salts of synthetic fatty acids of the Cg-Ce fraction 2-5%, nonionic surfactant 0 , 1-0.5% and the rest is water. 2 tab.

Description

The invention relates to technological lubricants for metal forming and can be used for various types of cold metal forming both during rolling and drawing of ferrous and non-ferrous metals. Known technological lubricant emulsol TU 6-14-254-74, having the composition,%: Oleic acid 10-12 Triethanolamine 4-5 Mineral oil

The disadvantages of emulsol are the formation of a significant amount of wear products and their poor removal from the metal surface.

A lubricant for treating metals by pressure roll is known, the disadvantage of which is heavy foaming, which impairs the operation of drawing and rolling mills.

Closest to the invention in composition is the lubricant aminol composition, wt.%:

Monoethanolamine salts of FFA S21-C2540-60 Monoethanolamides of distillation residue of FFA

Ci-C41-3 fractions Sodium salts of synthetic dicarboxylic

acids of the C4 fraction Cii0.3-5 Water Else The known lubricant has good anti-friction properties, however, a micro-biological damage to the prepared emulsion is a significant drawback, which worsens its quality and reduces its service life.

The purpose of the invention is to stabilize the lubricating properties by increasing the bactericidal resistance of the lubricant.

The goal is achieved by the fact that 4to a grease containing water and a mixture of monoethanolamine salts of synthetic fatty acids fractions and C21-C25 in a mass ratio of 1:10, respectively, additionally contains sodium soap FFA

w

Yo

Xi

so o o o so

fractions of Cs-Ce and nonionic surfactant in the following ratio of components,%:

A mixture of synthetic monoethanolamine salts

fatty acid fractions

Ci7-Cao and C21-C2525-35

Sodium Soaps SJK

Cs-Ce2-5 fractions

Nonionic surfactant0.1-0.5

Water Else

The ethanolamine salts of FFA are mild soaps that are prone to decay or mold (although this fact speaks in favor of such lubricants that are environmentally friendly). The appearance of bacteria promotes the decomposition of the emulsion, which reduces the antifriction properties of the lubricant and also reduces the life of the lubricant. Preservatives (inhibitors of microbiological damage) are introduced to prevent ongoing processes. In the proposed lubricant, the prevention of the formation and growth of putrefactive bacteria occurs due to the introduction of the Cs-Sb fraction, i.e. salts with a small radical Cs-Ce.

The following products are used to prepare grease:

Technical monoethanolamine according to TU 6-02-915-84 is an easily moving brown mass with a density of 1.015-1.018 g / cm3. The share of the main substance is not less than May 98,%.

.. Synthetic C21 fatty acids

;;,;. C25. Production technology and physical chemistry. Technical parameters are regulated by technical specifications.

38.407358-87, are solid

substance in the form of flakes with so pl. 53-57 ° C,

acid number 165-175 mg KOH / g

Synthetic fatty acids; C17-C20, GOST 23239-78, represent

a solid product of light yellow, that. The pour point is 45-51 ° C, the acid number is 195-210 mg KOH / g, ether: the number is 6.5 mg KOH / g.

Sodium FFA salts of the Cs-Ce fraction (ANSK-50 anticorrosive agent), TU 38.10757-80, oily light yellow liquid, fat content 25-30%, pH 1% aqueous solution 7-9.

To determine the optimal composition, five compositions were prepared (Table 1) using the following technology.

Monoethanolamine and water are charged into a grease container and heated to. Then, with stirring, the calculated amount of the synthetic fatty acids of the fraction and C21-C25 heated to 70-80 ° C is taken, taken respectively in a ratio of 1:10. The mixture is thoroughly mixed for 1.5-2 hours. After cooling to 50-60 ° C, the calculated amount of Cs-Ce sodium FFA salts and anionic surfactant are fed into the reactor and stirred for another 30-40 minutes. The finished product is a pasty mass of light gray color, it is easily diluted with water to the desired concentration required for the drawing or rolling process.

Mass fraction of fatty part 30%. The concentration of hydrogen ions, the pH of a 1% aqueous solution of 7-9.

As nonionic surfactants, monoalkyl ethers of polyethylene glycol based on primary fatty alcohols of the general formula CnH2n + iO (C2H40) mH, for example, neonol TU, can be used

38.103.625-87, syntanol D010 TU 614577-77.

Emulsions prepared from experimental compositions were tested for stability and corrosive effect according to GOST 6243-75.

All emulsions have a stable composition and are not subject to delamination. All emulsions passed the corrosion test.

The antifriction properties of the prepared compositions were evaluated by the drag force during wire drawing. The drawing process is a reduction in the cross-sectional area of the material when it is pulled through the draw and is most fully characterized by the indicator - the force

drawing, i.e. the force necessary to reduce the cross-sectional area of the workpiece by a predetermined amount. The degree of reduction of the cross-sectional area is most often characterized by the relative degree of reduction, determined by the formula

 mn - fk

 Fh

100%

where FH, FK are respectively the cross-sectional area of the stretched material before and after deformation.

To reduce the drag force, various technological processes are used.

lubricants providing separation of the contact surfaces of the deformable metal and the deforming tool, thereby reducing the friction coefficient between them. If the wire is drawn under the same conditions (the same workpiece material, drawing tool, deformation rate, temperature and others) with different lubricants, then the lubricant providing the minimum drawing force has the best antifriction properties. As a blank, steel brass wire with a diameter of 1.20 mm, St.70 grade, was selected. Drawing was carried out on a universal testing machine of the UMM-5 type, simulating a single drawing mill for one drawing with a relative compression of 23.4%, at a speed of 1.7 m / s

Before drawing and after changing each type of lubricant, the wire samples and the deforming tool (drag) were degreased with acetone.

Five types of wire are drawn with each type of lubricant. The average results of measuring the drag force are given in Table 2.

As a working tool, dies made of carbide type VK-6 were selected. Technological lubricant falling into the deformation zone (die channel) improves the conditions of contact friction, thereby reducing friction and, therefore, drag force.

The use of the proposed lubricant when drawing brass wire reduces the drawing force to 778.6 N, the life of the lubricant increases by 1.5-2 times.

Claims (1)

The claims A lubricant for cold metal forming containing water and monoethanolamine salts of synthetic fatty acids, characterized in that, in order to increase the bactericidal properties, the lubricant contains monoethanolamine salts of synthetic fatty acids of the Ciy-Cao fractions as monoethanolamine salts of synthetic fatty acids C21-C25 in their mass ratio, respectively, 1:10 and additionally contains sodium salts of synthetic fatty acids of the Cs-Cb fraction and a nonionic surfactant in the following co . Wearing components, wt%: A mixture of monoethanolamine synthetic salts fatty acid fractions C17-C20 AND C21-C25 IN THEM mass ratio, respectively, 1: 1025-35 Sodium salts of synthetic fatty acids of the Cs-Ce fraction 2-5 Nonionic surfactant Water 0.1-0.5 Else The compositions of the proposed tales ponoethanolamine salts. OKCfT-tjc .82 2.2 2.73 3.18 3.631.82 2.27 2.73 3.18 3.63, 82 2.2 2.73 3.18 3.63 Ronoethanol. salt OK C-Cjs18.18 22.73 27.27 31.82 36.3718.18 22, L 27.27 31.8236.37 18.18 22.73 27.2731.82 36.37 Sodium compounds С “К С, -С, 1 2 3,5 5 71 2 3,5 5 7 1 2 3,5 5 7 Neoyol 0.05 0.1 0.3 0.5 0.7 - Synthenol - -. - - -0.05 0.1 0.3 0.5 0.7 Stroke- ... .-- ..,. j 0) 5 4.1 0.3 0.5 0.7 Waters Else Else Else Else Table 1 Results of drawing brass wire with various compositions of the invention and prototype table 2