The working fluid

 

(57) Abstract:

Usage: in the hydraulic systems of aircraft. The inventive working fluid contains, by weight. % : epoxy compound is 0.5 - 5.0, polybutylmethacrylate 5,0 - 7,5; 4-triptoreline-3,6-dioxothiazolidine potassium 0,05 - 0,2; entrepinoy dye 0,0015 - 0,0025; dibutyltindilaurate to 100. table 2.

The invention relates to the creation of vzryvopozharobezopasnost working fluid, designed for use in hydraulic systems of aircraft.

To aircraft hydraulic fluids must meet stringent requirements: they must be fire-resistant, thermally and thermoacidophile stable, not to cause damage and wear of metal parts in contact with fluid, due to erosional activity of the liquid.

Well-known aviation vzryvopozharobezopasnost working fluid for hydraulic systems of aircraft (1) having the composition, wt. % :

Epoxy compounds of 0,1-10,0

Polyalkylated - relat 2,0-20,0 Water 0,2

Dibutyltin - phosphate To 100

As the epoxy compounds used alkyl-3,4-epoxycyclohexane. This composition has a high resistance. The disadvantage of this composition is low the C. Over 200 hours the acid number of the fluid is increased to 0.5 mg KOH/g copper corrosion reaches 0,40 mg/cm2.

In addition, the disadvantage of this composition is its high erosion activity, as evidenced by the low value of specific electric conductivity - to 4.98 cm/m 10-6measured for the sample prepared according to this patent.

Most are similar in composition and technical essence is the working fluid for hydraulic systems of aircraft (2), having the following composition, wt. % :

Epoxy compounds of 0.1 to 5.0

Polyalkylated - relat 2,0-20,0 Water 0,2

Dibutylaniline - veils To 100

As the epoxy compound in the composition used 2-ethylhexyl-5,6-epoxy-1,4-atlanticocean-2-Carbo - kilat. This song is the prototype of the proposed liquid. The disadvantage of this composition is its low thermal stability and high erosion activity: a test of the specified composition on thermal stability at 125aboutWith over 150 hours accompanied by increased acid number of 0.5 mg KOH/g, the corrosion of magnesium equal of 1.18 mg/cm2, cadmium - 0.26 mg/cm2and chromium - 0,47 mg/cm2. For sample fluid prepared according to U.S. Pat. N 407664 is installed shortcomings limit the service life of the fluid, as well as units of the hydraulic system in contact with liquid.

The invention is directed to the creation of a working fluid having high thermal stability and low erosion activity.

To solve this problem is proposed working fluid on the basis of dibutyltindilaurate containing epoxy compound, polybutylmethacrylate, 4-trifluoromethyl-PERFLUORO-3,6-dioxaoctyl-sulfonate and potassium antrahinonovye dye in the following ratio, wt. % :

Epoxy compounds of 0,5-5,0

Polybutylene - relat 5,0-7,5

4-Trifluoromethyl-Pere-

fluoro-3,6-dioxaoctyl - sulfonate potassium 0,05-0,2

Antrahinonovye dye 0,0015-0,0025

Dibutylaniline - veils To 100

As the basis of the proposed working fluid contains dibutyltindilaurate (TU 6-02-985-81).

As epoxy compounds may be used epoxy resin pack-632 (TU 38.402-62-114-90), which represents a 3,4-epoxycyclohexylmethyl (3', 4'-epoxycyclohexane) carboxylate of the formula

O< / BR>
In addition, as the epoxy compounds can be used diocese-1-vinyl-cyclohexane-3 formula

O (epoxy resin ERL-4206). Surface-active is2-CF(CF3)-O-CF2-CF2-SO3K is used as surfactants in the processes of electrochemical and chemical processing of metals in the aviation and automotive industries.

To give the characteristic color of the fluid as the purple dye used fat-soluble antrahinonovye dye (TU 6-14-118-80), which represents a 1-hydroxy-4-p-toluylenediamine formula

< / BR>
As a thickener use polybutylmethacrylate mol. m 5000-6500 (STF-0-19950-401-016-81 with ISM. N 1,2). The invention is illustrated by examples 1-3.

Fluid samples in examples 1-3 were prepared by mixing in a prescribed ratio, according to the table. 1, dibutyltindilaurate - basics, polybutylmethacrylate - thickener with stirring at a temperature of 60-80aboutWith up to complete dissolution, then thickened the basis of the remaining additives were added, stirred the mixture at a temperature of 60-80aboutWith up to dissolution. After cooling, the mixture was filtered.

Prepared samples of the liquid were evaluated for thermal stability and erosion activity. The results obtained are presented in table. 2.

Tests for thermal stabili steel in the presence of metal plates of copper, steel, aluminum and bronze, and detecting changes in physico-chemical characteristics of the fluid (appearance and acid number) after every 100 or 50 hours of testing.

Upon reaching the acid number of the fluid above 01,5 mg KOH/g test was stopped, the measured viscosity of the liquid at 50 -55aboutWith, and also determined the rate of corrosion of metals by weighing the plates and attributed the change of weight to the square of the plate.

To assess the erosive activity of the liquid measured the electrical conductivity, which was calculated electrical conductivity according to the formula = K G, where is the electrical conductivity, Cm/m; G is the electrical conductivity, Cm; K - constant of the measuring cell, m-1.

As can be seen from the data table. 2, using a combination of surface-active compounds 4-triptoreline-3,6-dioxothiazolidine potassium, epoxy compounds and antrahinonovye purple dye in the proposed composition of the working fluid on the basis of dibutyltindilaurate leads to higher thermal stability of the fluid, which is reflected in the increase in the 2.0-2.5 times the resource of her work at the operating temperature, reducing the corrosion of metals in comparison with prototile in 10 times in comparison with the prototype. (56) U.S. Patent N 3976585, CL 252-78,5, 1976.

U.S. patent N 4076642, CL 252-78,5, 1978.

The WORKING FLUID containing dibutyltindilaurate, epoxy compound and polybutylmethacrylate, characterized in that it further comprises a 4-triptoreline-3,6-dioxothiazolidine potassium and antrahinonovye dye in the following ratio, wt. % :

Epoxy compound 0,5 - 5,0

Polybutylmethacrylate 5,0 - 7,5

4-Trifluoromethyl-PERFLUORO-3,6-dioxothiazolidine potassium 0,05 - 0,2

Antrahinonovye dye 0,0015 - 0,0025

Dibutyltindilaurate To 100

 

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2 tbl, 1 ex

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2 tbl, 1 ex

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1 cl, 4 tbl

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11 cl, 1 tbl

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3 tbl

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2 tbl

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SUBSTANCE: invention is dealing with hydraulic systems of aircrafts and helicopters operated within temperature ranges between 135°C and -60°C. Working fluid is made up of, wt %: phenyl-α-naphthylamine 0.2-0.4, 2,6-di-tert-butyl-p-cresol 0.3-0.5, tricresyl phosphate 0.4-1.0. polyethylsiloxane liquid with viscosity 44-49 mm2/s (20°C) 17-23, dioctyl sebacate 9.9-10.1, poly-α-olefins with viscosity 1.7-2.0 mm2/s (100°C) 25-32, poly-α-olefins with viscosity 3.7-4.3 mm2/s (100°C) to 100%.

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2 tbl

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