SU749884A1 - Grease for hot pressure working of metals - Google Patents

Description

one

The invention relates to process lubricants for various types of hot metal forming (rolling, forging, pressing, etc.), and is mainly intended for use in the hot rolling of sheet and strip steel and can be implemented in metallurgical plants.

One of the most important goals of using process lubricants during hot rolling is to remove the tool from the wear resistance, reduce the pressure of the metal on the rolls and reduce energy consumption for deformation, which leads to an increase in the productivity of rolling mills, expansion of the grade and profile steel types, reduction costs 20 rolls and improve the quality of the finished product.

Nowadays, during the hot processing of metals by pressure, various lubricants are used, technological lubricants based on petroleum and vegetable oils in their pure form with the addition of various additives 1 .30

Known technological lubricant for hot metal processing, c. composition of which includes, wt.%:

Hydrolyzed lignin 8.5-10.5

Dibasic phosphate

ammonium 2-3,5

Paraffin3,5-6

Soap glue3,5-5,5

Polyvinyl acetate

1-3.5 emulsion ,,

Salicylic acid 0.1-2

Water. Up to 100 2.

However, with the use of a known lubricant, the energy consumption for deformation is not sufficiently reduced, which does not ensure high durability of the rolls, a significant increase in the productivity of rolling mills and a high level of product quality.

The object of the present invention is to increase tool life and reduce metal pressure on the rolls.

This goal is achieved by the fact that a lubricant for hot metal forming, containing water, modified lignin, a salt of phosphoric acid, and a polyvinyl acetate emulsion, contains modified ammonium lignin as modified lignin | ) О, as a salt of phosphoric kiolbot-sodium tripolyphosphate and to ttoSiSMJfieSl .Hb contains soap stock to grow spruce, oils and bipiperidine during the next shower (weight of components, wt.%:

Ammoniated lignin 7-15 5 Sodium tripolyphosphate 0.5-3 Soap stock of vegetable oils 10-40

Polyvinyl acetate

emulsion 0.5-2 10

Bipiperidine 0.01-1

Water Up to 100 ..,.,. Lignin ammoniated is obtained, from large-capacity rounds, hydrolysis of lignin by hydrolysis is 5 to 6, by oxidative ammonolysis with 25% aqueous ammonia, which forms. with the product contains 8-10% of total nitrogen and 65-70% of water. . . , Content. functional groups 20 and the elemental composition of amionized Vo lignin in comparison with liginbm and hydrolysis are given in Table. 1. Ammonized lignin in the process of lubrication: it performs several "functions: it is a highly efficient sorbent, an ion exchange resin and a complexing agent. Due to the immokadims carboxyl groups, it possesses the properties of chelate sorbents to ions of heavy metals and, in particular, to 3D Fe and. The increase in the content of carrxyl groups in the ammoniated lignium compared to its own hydrolytic lignin increases its sorption capacity for iron ions.

. -. . ; .. .

 In daylight, the ammoniated ligine is an ammonium salt, and it is known from the literature that the lignin salts have a large Q surface activity, i.e. are surfactants and are not inferior in effective-. salts of oleic acid.

A1lIonized lignin is an effective reducing agent for metal oxides, i.e. oxides and Fe are reduced to iron, and thus the scale formation is reduced. . . , .

Tripolyphosphate is used as an effective detergent and has good emulsifying properties. It is also an active phosphate & aytikorrs) dosage agent. The lubricant is used as an emulsifier and phosphating agent.

Soap stock is a product of alkaline refining sunflower oil. Soapstock has in its composition of 8-10% soap (stearic, palmitic, oleic, linoleic), neutral fats up to 1%, as well as phosphatides, white, mucous and resinous substances.

In SMeKI, the role of an active emulsifying agent that contributes to the lubricating effect.

Polyvolyl acetate emulsion (surfactant) According to GOST 10002-62, the emulsion contains more than 50% of dry matter, and the rest is water. Plasticized with dibutyl phthalate in the range of 5-15%. Monomer contains not more than 0.8%, pH 45, 5.

In the lubricant composition of the present invention, the surfactant is a thickener — a mortar that gives the desired viscosity and enhances the lubricating effect. VipiperjDin is a product of hydrogenation (catalytic or electrowinning) of pyridine bases or bipyridiums. It has strong basic properties: pK 7 pK 10.5. With acids able to form stable salts. Shows positive inhibitory affect. In process lubrication, it is used as corrosion inhibitor.

Water - liquid phase and solvent The technology of preparing a lubricant is reduced to the usual operation of mixing all the components listed in the recipe.

Lubricants No. 1, 2, and 3 were prepared (Table 2). The described lubricant is conventionally called SML-2.

The results of the comparative test data lubricants. SML-2 (compounds 1, 2, 3) and known lubricant are given in table. 3

Rolling conditions: temperature 1000 ° С, samples - steel electro-relay with a carbon content of 0.012%, width of initial samples 40 mm, speed O, 5 m / s., Conditions of rolling are recorded with an H 70 oscilloscope.

It follows from the above dosages that the proposed lubricant is 7.4% more effective. , -. , - .. I; ,: ; . Table 1 /

Lignin hydrolysis- .. yy 65.0 10.5 24.5 Amg oyiznirovanny - - 1st p y.6% 0 18.7 9.94 4.96 3.95 13.16 18.78 4.11 14.34

"Q on rolls." As a modified lignin, the lubricant contains lignin harmonized, as a salt of phosphoric acid, sodium tripolyphosphate and additionally contains α-stock, vegetable oils and bipiperidine in the following ratio of components, wt.%:

table 2

Sources of information taken into account in the examination

1.Grudev A.P. et al., Technological lubricants in the rolling industry. Moscow, Metallurgi, 1975, from 275315.

2. The copyright certificate in application 2469929 / 23-04, cl. C 10 M 7/10, 1977 (prototype).

Claims (1)

Claim I A lubricant for hot metal forming containing water, modified lignin, phosphoric acid salt and polyvinyl acetate emulsion, characterized in that, in order to increase tool life and reduce metal pressure on the rolls, the lubricant contains ammonium lignin as modified lignin , as a salt of phosphoric acid - sodium tripolyphosphate and additionally contains> soap stock of vegetable oils and bipiperidine in the following ratio of components, weight. %: 7-15 Sodium Tripolyphosphate 0.5-3 Soap Stock Vegetable Oils 10-40 Polyvinyl Acetate Emulsion 0.5-2 Bipiperidine 0.01-1 Water Up to 100