RU2255964C2 - Lubricant-and-coolant concentrate for metal working - Google Patents

Abstract

FIELD: metal working.

SUBSTANCE: proposed concentrate contains, mass-%: mineral oil, 15-30; condensation product of non-saturated fatty acid and 2,2¹-imino diethanol at mole ratio of1 : (2.5-5.0), 15-25; fatty acids of vegetable oils of fraction C₁₂-C₂₀, 2-6; glycols, 20-35; boric acid, 2-5; polyoxiethylated alkyl phenols, 0.1-5.0; product of interaction of acid ester of boric acid and alkanol amines, 1-6; anti-foaming agent, 0.05-0.3; the remainder being water. Proposed liquid has improved lubricating properties, enhanced biostability; enhanced resistance to positive and negative temperatures.

EFFECT: enhanced efficiency; extended field of application.

4 tbl

Description

The invention relates to cutting lubricants, in particular to compositions of cutting fluids used in the machining of metals.

A well-known coolant concentrate for machining metals, including mineral oil, the reaction product of triethanolamine with unsaturated fatty acid or tall oil acids, monoethanolamine, boric acid, triethanolamine, bis (alkylpolyoxyethylene) phosphate-Oxyphos KD-6 and water (US Pat. RF № 1383779, class C 10 M 173/00, 1995). This concentrate has good lubricating properties, but insufficient biostability.

Known coolant concentrate for metal cutting, including mineral oil, monoethanolamine, fatty acid, water, boric acid or a mixture of boric acid with a nonionic surfactant in their mass ratio (2.5-14): 1 (US Pat. RF 2041252, C 10 M 173/00, 1995). This concentrate has high biostability, but insufficient resistance to low temperatures.

Closest to the claimed invention, the composition of the same purpose for the combination of essential features is a coolant concentrate containing the product of the processing of fatty acids of vegetable oils of fractions C ₁₂ -C ₂₀ diethanolamine at a temperature of 130-150 ° C, mineral oil, glycols, polyoxyethylene alkyl phenol with 4-6 hydroxyethyl groups, the product of the interaction of boric acid with alkanolamines at a temperature of 95-105 ° C, fatty acid fraction C ₁₂ -C ₂₀ , lower primary alcohols fraction C ₃ -C ₇ , antifoam and water (US Pat. RF 2107715, class C 10 M 173/00, 1998). This concentrate is resistant to biodefeat, but does not have sufficient lubricating properties and temperature stability of the concentrate.

The objective of the invention is the creation of a biostable coolant concentrate, with improved lubricating properties, stable to both positive and negative temperatures and expanding the range of coolants used for machining metals.

The technical result is to improve the lubricating properties of the coolant concentrate, biostability, stability to the effects of both positive and negative temperatures. The specified technical result is achieved by the fact that the concentrate of cutting fluid for machining metals containing mineral oil; glycols; fatty acid treatment product, polyoxyethylene alkyl phenols; fatty acids of vegetable oils of fraction C ₁₂ -C ₂₀ , antifoam and water; according to the invention additionally contains boric acid, a reaction product of an acid ester of boric acid and alkanolamines, and as a product of processing fatty acids it contains a condensation product of an unsaturated fatty acid and 2.2 ^1- iminodiethanol in a molar ratio of 1: (2.5-5.0) in the following ratio, wt.%:

- mineral oil - 15-30

- condensation product of unsaturated

fatty acid and 2,2 ^1- iminodiethanol

with a molar ratio of 1: (2.5-5.0) - 15-25

- fatty acids of vegetable oils fraction C ₁₂ -C ₂₀ - 2-6

- glycols - 20-35

- boric acid - 2-5

- polyoxyethylated alkyl phenols - 0.1-5.0

- the product of the interaction of the acid ester of boric acid and alkanolamines - 1-6

- antifoam - 0.05-0.3

- water - the rest

A study of the properties of the inventive coolant concentrate and its aqueous emulsions showed that the use in combination with all other ingredients of the condensation product of unsaturated fatty acid and 2,2 ^1- iminodiethanol with a molar ratio of 1: (2.5-5.0) and the introduction of the product in the interaction of acidic boric acid ester and alkanolamines together with boric acid leads to improved stability of the concentrate to the effects of both positive and negative temperatures and its lubricating properties, while its biostability is also improved. For the preparation of the inventive concentrate was used:

- industrial oils with viscosity at 40 ° C 13-25 mm ² / s according to GOST 20799-88;

- polyoxyethylated alkyl phenols (emulsifier OP-4 according to TU 6-02-997-90 or Neonol AF-9 according to TU 2483-077-057668-01-98);

- antifoam according to TU 6-02-1-529-86;

- fatty acid of vegetable oils of fraction C ₁₂ -C ₂₀ (technical oleic acid according to GOST 7580-91, or B-115 grade oleic acid according to TU 9145-172-4731297-94, or imported Etkemor TI-05 oleic acid from Henkel );

- glycols (ethylene glycol according to GOST 19710-83, or diethylene glycol according to GOST 10136-77, or a mixture of glycols according to STP 2422-004-00148843-2001);

- a condensation product of oleic acid of grade B-115 according to TU 9145-172-4731297-94 or technical oleic acid according to GOST 7580-91 and 2,2 ^1- iminodiethanol according to TU 6-09-2652-86 with a molar ratio of 1: (2 5-5.0) at a temperature of 120-140 ° C;

- the product of the interaction of an acid ester of boric acid and alkanolamines with an amine number of at least 500 mg-KOH / g, obtained by reacting at a temperature of 80-95 ° C boric acid according to GOST 18704-78 with monoethanolamine according to TU 6-09-215-84 or triethanolamine according to TU 6-02-916-79 or with a mixture of monoethanolamine and triethanolamine in a ratio of 1: 1;

- boric acid according to GOST 18704-78.

The coolant concentrate is obtained by mixing the components at a temperature of 40-60 ° C to a homogeneous mass in devices with mechanical stirring.

For metalworking operations, 2-15% aqueous emulsions of coolant concentrate are used.

For testing, coolant concentrate samples were prepared, the compositions of which are given in table 1. The emulsions of the proposed and known concentrate were prepared on water with a hardness of 4.6 mEq / l. The evaluation results of the proposed coolant concentrate on biostability, anticorrosion characteristics and foaming properties are shown in table 2. The biostability of the coolant concentrate was determined according to GOST 9.085-76, anticorrosion characteristics according to GOST 6243-75 by the method of “contact pairs” (cast iron-steel) and “drip” method on an alloy Al-4 and copper M-1. Pricing tendency and foam stability were determined according to the “Methodology for measuring the foam tendency and foam stability of lubricants, certified on 05/14/01 MVI N42 / 005-01. The stability of the coolant was determined by assessing the appearance of the coolant after exposure to high and low temperatures in accordance with GOST 6243-76 Section 6 - “the absence of the formation of various liquid layers and the release of solids” (table 4).

When exposed to temperatures from minus 30 ° C to plus 60 ° C, the coolant concentrate remained stable.

Lubricating properties were evaluated by the level of tribological characteristics of 3% emulsions of the known and proposed concentrate, which were determined on a four-ball friction machine ChShM in accordance with GOST 9490-75 (table 2), and according to the results of tests on an automated dynamometer stand ADF (table 3).

Tests of the technological properties of 3% emulsions on ADF were carried out on the operation of drilling an Al-12 aluminum alloy with an F7 mm drill made of P6M5K5 alloy with an axial load of 27.86 kg, a processing length of 25 mm and processing speeds of 0.216 and 0.513 m / s.

It is established that the proposed composition has lower torques and higher feeds in comparison with the known one. When tested on a chshm, the proposed composition has a higher welding load and a smaller diameter of the wear spot. These results indicate higher lubricating properties of the proposed concentrate.

The obtained test results show that the proposed biostack concentrate is stable in a wide range of both positive and negative temperatures and has better lubricating properties in comparison with the known one.

Claims (1)

Cutting fluid concentrate for mechanical processing of metals, containing mineral oil, glycols, a fatty acid treatment product, polyoxyethylated alkyl phenols, fatty acids of vegetable oils of the C ₁₂ -C ₂₀ fraction, boric acid, a reaction product of boric acid ester of alkanolamines, antifoam and water characterized in that the fatty acid treatment product comprises a condensation product of an unsaturated fatty acid and 2.2 ¹ -iminodietanola at a molar ratio of 1: 2.5 - 5.0 at the following relations shenii, wt.%: Mineral oil 15-30 Unsaturated condensation product fatty acid and 2,2 ^1- iminodiethanol with a molar ratio of 1: 2.5-5.0 15-25 Vegetable Oil Fatty Acids fractions C ₁₂ -C ₂₀ 2-6 Glycols 20-35 Boric acid 2-5 Polyoxyethylated alkyl phenols 0.1-5.0 The product of the interaction of acidic boric acid ester and alkanolamines 1-6 Antifoam 0.05-0.3 Water Else