RU2233314C1 - Hydraulic liquid - Google Patents

Abstract

FIELD: chemical technology.

SUBSTANCE: invention relates to hydraulic liquid used in casting machines under pressure. Liquid contains the following components, wt.-%: water, 37-42; thickening agent, 14-18; sodium hydroxide, 0.2-0.3; benzoic acid, 0.3-0.8; 2-mercaptobenzthiazole, 0.05-0.06; technical alkylsalicylic acids, 1.0-2.5; triethanolamine, 0.5-1.5; morpholine, 1.5-2.5; butyl cellosolve, 4.8-5.3; froth breaker, 0.01-0.04; dye, 0.0025-0.0035; diethylene glycol, the balance.

EFFECT: improved anti-wear properties.

3 tbl, 15 ex

Description

The invention relates to the field of chemical technology, in particular to a new generation of non-combustible hydraulic fluids used as a working fluid in hydraulic systems of injection molding machines.

Non-combustible water-glycol-based hydraulic fluids are known containing antiwear additives, corrosion inhibitors, antioxidant additives and others (US 2602780, CL 252 - 73, 1952; US 2947699, CL 252 - 76, 1960; US 3005776, CL 252 - 77, 1961; US 3992312, class 252 - 77, 1976; EP 0221212, class C 23 F 11/173, 1985; PL 149256, class C 10 M 169/06, 1990; RU 2081154, class C 10 M 173/02, 1997).

The considered hydraulic fluids have low anti-wear properties.

The closest in composition and properties is a hydraulic fluid having the following composition, wt.% (RU 2083646, class C 10 M 173/02, 1997 - prototype):

Glycol 15-35

Water 37-42

Caustic soda 0.58-0.63

2-Mercaptobenzthiazole 0.045-0.055

Oleic acid 0.75-0.85

Morpholine 3.3-3.8

Butyl cellosolve 4.8-5.3

Cyclohexanone 1.32-1.8

Benzoic acid 1.6-1.8

Defoamer 0.01-0.1

Dye 0.0025-0.0035

Thickener Else

The disadvantage of the prototype are low antiwear properties.

The aim of the invention is to develop compositions that increase antiwear properties.

This goal is achieved in that a non-combustible hydraulic fluid containing glycol, water, a thickener, morpholine, 2-mercaptobenzthiazole, butyl cellosolve, benzoic acid, caustic soda, antifoam and dye, additionally contains technical alkyl salicylic acids and triethanolamine in the following ratio of components, wt%. :

Water 37.0-42.0

Thickener 14.0-18.0

Caustic soda 0.2-0.3

Benzoic acid 0.3-0.8

2-Mercaptobenzthiazole 0.05-0.06

Technical alkyl salicylic acids 1.0-2.5

Triethanolamine 0.5-1.5

Morpholine 1.5-2.5

Butyl cellosolve 4.8-5.3

Defoamer 0.01-0.04

Dye 0.0025-0.0035

Diethylene glycol rest

Diethylene glycol according to GOST 10136-77 is used as glycol.

As a thickener, a water-soluble polymer obtained by copolymerization of ethylene and propylene oxides is used, according to TU 2422-010-57253465-2003.

As an antifoam agent, an organosilicon-based organic defoamer is used, for example, EAP-40 according to TU 6-02-892-79.

Triethanolamine is used according to TU 6-02-916-79, technical alkyl salicylic acids are used in accordance with the STP of the Novo-Kuibyshevsky Oil Refinery.

Morpholine is used according to TU 6-14-366-80, butyl cellosolve - according to TU 6-01-646-84.

As a dye, an alcohol-soluble dye is used, for example, Bordeaux C according to TU 6-14-759-80.

Comparative analysis with the prototype shows that the claimed composition of the non-combustible hydraulic fluid is different from the known introduction of new components - technical alkyl salicylic acids and triethanolamine. Thus, the claimed technical solution meets the criterion of "novelty."

The use in the composition of the hydraulic fluid of new components in combination with the ratios known in the claims provides properties that are manifested only in this technical solution: high lubricity of the non-combustible hydraulic fluid while maintaining the required technological properties. When studying other technical solutions in this field of technology, the features that distinguish this invention from the prototype were not identified, which ensures that this technical solution meets the criterion of "significant differences".

A non-combustible hydraulic fluid of this composition is prepared by sequentially dissolving the components in a water-glycol mixture by mixing them at 45-60 ° C, followed by filtering the resulting solution.

For testing, samples are prepared, the compositions of which are shown in table 1.

Example 1. A container with a solution of 31.817 g of diethylene glycol in 40.0 g of water is heated to 55 ° C. Then, with stirring, 2.5 g of technical alkyl salicylic acids, 1.5 g of triethanolamine, 2.0 g of morpholine, 0.06 g of 2-mercaptobenzthiazole, 0.3 g of sodium hydroxide, 0.8 g of benzoic acid, 5 are successively dissolved in it. , 0 g of butyl cellosolve, 0.02 g of antifoam, 0.003 g of dye, 16.0 g of thickener. The mixture is kept for 1.5 hours until all components are completely dissolved. The resulting solution is filtered through filter paper, belting or other filter materials.

Other formulations are prepared similarly.

Samples of non-combustible hydraulic fluid, the compositions of which are shown in table 1, are subjected to anti-wear tests on a four-ball machine at 20 ° C and a speed of 1500 rpm, according to GOST 9490-75, while determining the diameter of the wear spot (d _wear ), critical load ( P _k ) and the welding load (P _s ). Comparative results of antiwear tests are presented in table 2.

The main physical and chemical properties of a non-combustible hydraulic fluid are presented in table 3.

As can be seen from the data of tables 1 and 2, compositions 1-4 have high lubricating properties.

A decrease in the content of industrial alkyl salicylic acids below 1.0 wt.% Causes a decrease in the antiwear properties of the liquid (Example 5), and an increase in their concentration above 2.5 wt.% Does not lead to an increase in the positive effect (Example 6).

The increase in the content of triethanolamine and morpholine above the upper limits does not lead to an increase in the lubricating properties of the liquid (examples 7, 8).

An increase in the concentration of 2-mercaptobenzthiazole above 0.06 wt.% Does not affect the anti-wear properties (example 9), and its decrease below 0.05 wt.% Leads to an increase in the wear spot (example 10).

The decrease in the content of benzoic acid below 0.3 wt.% Leads to a decrease in the lubricating properties of the liquid (example 12), and at its concentration above 0.8 wt.% The positive effect is not enhanced (example 11).

A decrease in the concentration of butyl cellosolve below the lower limit leads to an increase in the diameter of the wear spot and the value of the critical load (example 13), and its increase above the upper limit does not increase the positive effect (example 14).

The decrease in the content of the thickener below 14.0 wt.% Leads to a decrease in the lubricating properties of the liquid (example 15).

A decrease in the content of triethanolamine below 0.5 wt.% Leads to opalescence of the solution, followed by its separation.

A decrease in the morpholine content below 1.5 wt.% Leads to the separation of the liquid.

An increase in the concentration of the thickener above 18.0 wt.% Leads to an excess of the standard value of the kinematic viscosity of the liquid.

An increase in the content of caustic soda above 0.3 wt.% Leads to an excess of the standard value of the hydrogen pH.

A decrease in caustic soda content below 0.2 wt.% Leads to the appearance of a precipitate.

Thus, the proposed composition of a non-combustible hydraulic fluid has enhanced anti-wear properties.

Claims (1)

A hydraulic fluid containing diethylene glycol, water, a thickener, morpholine, 2-mercaptobenzthiazole, butyl cellosolve, benzoic acid, sodium hydroxide, antifoam and a dye, characterized in that it additionally contains technical alkyl salicylic acids and triethanolamine, in the following ratio of components, wt.%. Water 37.0-42.0 Thickener 14.0-18.0 Caustic soda 0.2-0.3 Benzoic acid 0.3-0.8 2-mercaptobenzthiazole 0.05-0.06 Technical alkyl salicylic acids 1.0-2.5 Triethanolamine 0.5-1.5 Morpholine 1.5-2.5 Butyl cellosolve 4.8-5.3 Defoamer 0.01-0.04 Dye 0.0025-0.0035 Diethylene glycol rest

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