SU1142502A1 - Lubricant for cold plastic metal working - Google Patents

Abstract

TECHNOLOGICAL LUBRICATION FOR THE COLD TREATMENT OF METALS BY PRESSURE, containing mineral oil and polymer additive, which means, in order to reduce the power parameters of rolling and improve the quality of the surface, the lubricant contains a mixture of phosphonated and brominated polyethylen mol. mass 800 1000 and additionally contains monoalkyl ether of polyethylene glycol primary fatty alcohols fraction C ,, with the number of moles of oxide ethyles, g per 8-10 at the following ratio of components, May. %: Phosphonated polyethylene mol. masses 800-1000. 10-25 Brominated polyethylene mol. masses 800-1000 5-20 Monoalkyl ether of polyethylene glycol primary fatty alcohol; comrades of fraction C) g with number, ethylene oxide rejuvenation 8-10 0.5-1.5 Mineral i: o: l Remaining oil o

Description

The invention relates to metal processing, in particular to technological lubricants, which are used in the machining of metals, for example, in drawing and rolling pipes and sheets. Technological lubricants used in cold deformation of pipes and sheets on the basis of mineral, vegetable oils and various functional additives pj are known. The difficulty with most process lubricants is the need to use a sub-layer (copper or phosphate). Technological lubricants are also known, the use of which does not require the preliminary application of a sub-lubricant coating, for example, a lubricant consisting of mineral oil and high molecular weight polyethylene (mol. Mass more than SOOOO) | 2J. The disadvantage of this lubricant is qe low anti-friction and extreme pressure properties, which leads to metal sticking to the tool and breaks of the deformable product. The technological lubricant consisting of mineral oil, polyethylene (mol , mass 8001000) and triethanolamine salt of alkylphosphates based on hydroxyethyl-iroinci primary fatty alcohols of fraction C (Q-C, 3. The disadvantage of this lubricant is high energy The purpose of the invention is to reduce the power and power parameters of rolling and improve the quality of the surface of the products. The goal is achieved by the fact that technological lubricant for cold metal forming containing mineral oil and a polymer additive, as the latter contains a mixture phosphonated and brominated polyethylenes mol. mass 800-1000 and additionally contains polyethylene glycol monoalkyl ether of primary fatty alcohols fraction with the number of moles of ethylene oxide 8-10 p and present the following component ratio, wt.%: phosphonated polyethylene mol. mass 800-100010-25 Brominated polyethylene mol. mass 800-1000 5-20 Monoalkyl ether of polyethylene glycol primary fatty alcohols fraction number of moles of ethylene oxide 8-10 0.5-1.5 Mineral oil Remaining V. As mineral oil, it is advisable to use industrial oil I-12Ao To prepare the lubricant use the following ingredients: mineral I-12A oil (GOST 20799-75), polyethylene glycol monoalkyl ether, primary fatty alcohols of C fraction (QC (g with the number of moles of ethyl oxide--; by 8-10 (TU 6-14-577-77), polyethylenes mol., masses 800-1000 (TU 6-051837-88), which is phosphonated and brominated. Polyethylene is the main lubricant component. Polyethylene with a molecular weight of 800-1000 is used to obtain phosphonated and brominated polyethylene, which is a by-product in the preparation of high-density low-density polyethylene in an autoclave reactor. Main characteristics of polyethylene used are as per TU-6-051837-77 as follows: Exterior Waxy-like mass of light gray color 800-1000 Mol. mass Melting point (in the capillary). С Mass fraction not more than,% 0.1 Density, g / cm 0.86-0.88 Phosphonation of polyethylene was carried out by its interaction with phosphorus and hydrogen chloride trichloride

in the presence of a cyclohexene catalyst. The reaction was carried out in a three-necked flask equipped with a stirrer, a thermometer immersed in the liquid phase, a reflux condenser and a bubbler for supplying oxygen. The temperature was maintained equal to 45-55 ° С during the whole experiment (3 6, h). After a certain reaction time, a solution of phosphonated polyethylene was obtained, which was concentrated in vacuum in the reaction flask to 1/3 of the original volume and then poured into a vigorously stirred mixture of ice and distilled water. The precipitated hydrolyzed polymer, containing the POCON group), was separated, washed with water and dried in vacuum at 40-45 ° C to constant weight.

 Bromination of polyethylene was carried out by the interaction of polyethylene with I-bromosuccinimide in solution. carbon tetrachloride. The process was initiated by peroxide compounds (benzoyl peroxide) or ultraviolet irradiation. The reaction proceeded at 40-60 ° C for 1-3 hours.

The passage of the modification reaction with phosphorus and bromine was confirmed by the data of elemental analysis and PC spectroscopy,

Phosphorus-modified polyethylene contained 13% phosphorus and has the formula

- (CH2) ti-CHno-reg II o

where n 10.

The bromine-modified polyethylene contained 12% bromine and has the formula

- (CH2L-CHVg

where P 40.

The polyethylene modified with phosphorus and bromine is easily dissolved in mineral oil, does not precipitate, and improves the viscosity of the lubricant.

42502 4

Mineral oil I-12A performs the function of a solvent with respect to the basic lubricant component — phosphonated and brominated polyethylene.

Monoalkyl ether of polyethylene glycol C-C primary fatty alcohols is a surfactant, improves the adhesion properties of the first monomolecular layer of lubricant and acts as a lubricant stabilizer.

The preparation of technological lubricant based on phosphonated and 15brominated polyethylene is carried out by dissolving the latter in I-12A mineral oil at 40-50 ° С with further addition of the above monoalkyl ether of polyethylene glycol with stirring.

The lubricant is applied to the deformable product by dipping, pouring or piping under pressure on the product in front of the deformation zone. 5 / Be prepared the following compositions of lubricants (see Table 1).

For testing was attached-. prepared known lubricant (part 6), May. %: 0 Polyethylene mol. by weight

800-100025

Triethanolamine alkyl phosphate

based on ethoxylated primary fatty alcohols

0 fractions C, Q - C, C 10 Mineral

butter65

Rectangular specimens of 1 steel 0.8 KP with a width of 30 mm, a length of 40 mm 5 prokkatoali on the laboratory duo 150 at a speed of 0.05 m / s, rolling temperature 50 ° C.

The test results are shown in Table. 2

0 As can be seen from the table. 2, when rolling samples on the lubricant of the prototype (composition 6), a rolling force of 840 kN / m, a stretching ratio of 1.67, a reduction of 39% was observed. Offered

5 lubricant (compounds 1-4) provides high surface quality (0.063 μm) and improvement of the power and force parameters of the rolling process

by 20%. Thus, for composition 3, a rolling force of 660 kN / m, a reduction rate of 46%, a stretching ratio of 1.75 was achieved. For composition 5, in which armored polyethylene is not included, there is a smaller decrease in energy-power parameters of the process than for compositions 1-4. The percentage of ingredients proposed is optimal for compositions 2-4, where the maximum increase in aHepto-force parameters of the process is achieved. Increasing and decreasing the concentration of components does not lead to a further increase in the efficiency of the process.

Testing the stability of lubricants by volume of delaminated lubricant for 30 days showed that the proposed lubricant is highly stable.

The reduction in the power-and-power parameters of rolling according to the proposed composition is explained by the features of the high-temperature chain destruction of the polymer component initiated by polyethylene glycol monoalkyl ether. Under high loads and contact stresses, polyethylene containing phosphorus and bromine chemically interacts with the juvenile metal of the friction surface, c. resulting in chemical modification of the friction surface. The presence of phosphorus in the polymer predominantly affects the characteristics of increasing the critical load under friction and thereby reducing the metal pressure on the rolls, the presence of bromine - to improve the mode of friction under the loads of critical loads.

The proposed lubricant can be used in the metalworking industry and is used in the operations of cold-rolling pipes, sheet metal forming, and backward stretching.

Table 1

Phosphonated polyethylene, mol. weight

10 800-1000

Brominated poly20

800-1000 Monoalkyl ether of polyethylene glycol primary fatty alcohols 0.5 0.8 fractions 69.5 69.2 Mineral oil

thirty

25

20

10 1.0 1.2 1.5 69.0 68.8 68.5

1.72 1.74 1.75 1.745 1.7 1.67 Table 2

700 680 660 670 722 840

Claims (1)

TECHNOLOGICAL GREASING FOR COLD PROCESSING OF METALS WITH PRESSURE, containing mineral oil and a polymer additive, it is recommended that, in order to reduce the energy and strength parameters of rolling and improve the quality of the machined surface, the lubricant as a polymer additive contains a mixture of phosphonated and armored polyethylene mol. mass 800A 1000 and additionally contains monoalkyl ether of polyethylene glycol of primary fatty alcohols of fraction C _(d - C, with the number of moles of ethylene oxide 8-10 in the following ratio, May.%: Phosphonated polyethylene mol. masses 800-1000 10-25 Armored polyethylene pier. masses 800-1000 Monoalkyl ether polyethylene glycol of primary fatty alcohols fraction C ₁₀ ~ C ₁₈ with the number of moles of ethylene oxide 8-10 Mineral oil 5-20 0.5-1.5 Rest SU ... 1142502