RU2598031C2 - Lubricating oil composition for gas turbines - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: present invention relates to petrochemistry, particularly to lubricating oil which is suitable for use in gas turbine engines. Disclosed is lubricating oil composition containing tricresyl phosphate or trixylenyl phosphate (1.5-3 wt%), alkylated phenyl-alpha-naphthylamine (0.5-1 wt%), alkylated ester 3,5-bis-(1,1-dimethylethyl)4-hydroxybenzopropanoic acid (1-2 wt%), toluene triazole derivative (0.002-0.006 wt%) and base polyalphaolefin oil (up to 100 wt%).

EFFECT: increased specific time of lacquer formation and reduced coking.

1 cl, 2 tbl

Description

The present invention relates to oil refining and petrochemistry, in particular, to the composition of lubricating oil intended for use in gas turbine engines of aircraft and marine drives of gas pumping units and other types of equipment with gas turbines.

It is known (patent RU 2109800 C1, class C10M 141/10, publ. 04/27/1998) lubricating oil for gas turbines used for lubrication of gas-turbine drives as a part of gas-pumping units and gas-turbine power plants of the following composition,% mass .:

2,6-ditretbutylparacresol 0.5-3.0 n, n'-dinonyldiphenylamine 0.2-0.5 tricresyl phosphate or diphenyl paratretbutyl phenyl phosphate 1.0-3.0 benzotriazole 0.005-0.1 base oil (petroleum or synthetic) rest

The disadvantages of this oil are poor performance properties - insufficient level of thermal oxidative stability (175 ° C).

It is also known (patent RU 2325434 C2, class C 10M 141/06, publ. 05.27.2008) lubricating oil for power turbines of the following composition,% mass .:

reaction products of N-phenylbenzeneamine and 2,4,4-trimethylpentane 0.1-1.5 trimethylpropane and monobasic esters carboxylic acid or diisooctylsebacinate 10.0-40.0 2,6-ditretbutylparacresol 0.5-5.0 tricresyl phosphate 1.0-5.0 benzotriazole 0.001-0.5 base polyalphaolefin oil PAOM-4 rest

The disadvantages of this oil composition are increased hygroscopicity and a tendency to hydrolysis due to the essential compounds used in the composition (up to 40%).

The closest in composition and technical result to the claimed lubricating oil is a lubricating oil for gas turbines of the following composition,% mass .:

thermostable diisooctylsebadinate 2,6-ditretbutylparacresol alkylated diphenylamine, or n, n '-dinonyl diphenylamine, or mixture of butyl and octyl diphenylamines tricresyl phosphate or diphenyl paratretbutyl phenyl phosphate 1.0-3.0 benzotriazole base oil (synthetic polyalphaolefin) rest

(Patent RU 2185423 C2, class C10M 129/72, published on July 20, 2002).

The lack of oil of this composition is the tendency to form high-temperature deposits, which leads to coking of labyrinth seals of gas turbine engines.

The technical result of the present invention is to reduce the tendency to form high temperature deposits.

To achieve the technical result, a lubricating oil for gas turbines is proposed, containing tricresyl phosphate, a base polyalphaolefin oil, characterized in that it contains (C ₁₃ -C ₁₅ ) alkyl ether 3,5-bis (1,1-dimethylethyl) -4- hydroxybenzopropanoic acid, a derivative of tolutriazole in the form of N, N-bis- (2-ethylhexyl) -4-methyl-1H-benzotriazole-1-methylamine, polymethylsiloxane in the following ratio, wt.%:

alkyl phenyl alpha naphthylamine 0.5-1.0 (C ₁₃ -C ₁₅ ) alkyl ester 3,5-bis (1,1- dimethylethyl) -4-hydroxy benzopropane acid tricresyl phosphate 1.5-3.0 derivative of tolutriazole in the form of N, N-bis- (2-ethylhexyl) -4-methyl-1H- benzotriazole-1-methylamine 0.1-0.3 polymethylsiloxane 0.002-0.006 base polyalphaolefin oil PAO-4 up to 100

Instead of tricresyl phosphate, the proposed lubricating oil may contain trixylene phenyl phosphate.

For the preparation of lubricating oil compositions use:

alkylated phenyl-alpha-naphthylamine - Naugalube APAN manufactured by Chemtura - a clear yellow liquid with a kinematic viscosity of 23 mm ² / s at 100 ° C;

(C ₁₃ -C ₁₅ ) alkyl ester of 3,5-bis (1,1-dimethylethyl) -4-hydroxybenzopropanoic acid - Naugalube 38 manufactured by Chemtura, in the form of a transparent liquid with a yellowish tint with a flash point in a closed crucible of at least 229 ° FROM;

tricresyl phosphate according to GOST 5728-76 or trixylene phenophosphate-Durad 220X manufactured by Chemtura, in the form of yellowish transparent liquids with a flash point of at least 240 ° C;

tolutriazole derivative in the form of N, N-bis- (2-ethylhexyl) -4-methyl-1H-benzotriazole-1-methylamine-Irgamet-39 manufactured by BASF / Ciba. A colorless liquid with a boiling point of 271 ° C, a density of 0.94-0.96 g / cm ³ , a flash point above 280 ° C;

polymethylsiloxane (PMS-200A according to OST 6-02-20-79);

PAO-4 synthetic base oil obtained by oligomerization of α-olefins with a kinematic viscosity of 3.8-4.1 mm ² / s at 100 ° C, flash point in open crucible not lower than 200 ° C, pour point not higher than minus 60 ° C .

The technology for preparing the oil proposed in the present invention, the composition consists of the following operations: dosing additives, mixing the base of the oil with additives until they are completely dissolved, filtering the finished oil. For testing, oil samples were prepared, the composition of which is shown in table 1.

Comparative data obtained in the study of samples of the proposed oil and oil of the prototype are shown in table 2.

As can be seen from the data of table 2, the use of a combination of components and their quantitative ratio in the composition of the oil proposed in the present invention, allows to obtain the claimed technical result, which consists in reducing the tendency to form high-temperature deposits in comparison with the prototype. An increase in the characteristic time of lacquering, determined according to GOST 23175, and a decrease in coking, determined at the installation by the method of FTM 791-3462, were noted.

The use of the inventive lubricating oil allows for reliable and uninterrupted operation of gas turbine engines of aircraft and ship drives of gas pumping units and other types of equipment with gas turbines.

Table 1
The composition of the oil samples Components The amount,% of the mass. Example 1 Example 2 Example 3 Example 4 Alkylated Phenyl-Alpha-Naphthylamine 0.5 0.7 0.7 1,0 P- (3,5-Ditretbutyl-4-hydroxyphenyl) propionic acid alkyl ester 2.0 1,2 1,2 1,0 Tricresyl phosphate 1,5 2.5 - - Trixylene phenate - - 2.0 3.0 Derivative of tolutriazole in the form of N, N-bis- (2 ethylhexyl) -4methyl-1H-benzotriazole-1-methylamine 0.1 0.2 0.2 0.3 Polymethylsiloxane 0.002 0.004 0.004 0.006 Synthetic base oil PAO-4 up to 100 up to 100 up to 100 up to 100

table 2
Comparative characteristics of the oil, the claimed composition and prototype Name of indicator Oil example No. 1 Oil example No. 2 Oil example No. 3 Oil example No. 4 Prototype Oil Kinematic viscosity according to GOST 33 at 100 ° С, mm ² / s 3,877 3,904 3,893 3,924 3,784 Flash point in open crucible according to GOST 4333, ° С 220 223 222 225 218 Tribological characteristics according to GOST 9490:
critical load, Rk, N
wear spot diameter at axial load 196 N, Dh, mm 696
0.32 696
0.30 696
0.30 735
0.31 696
0.30 Thermo-oxidative stability according to GOST 23797 at 200 ° С for 50 hours (air consumption 10 l / h):
kinematic viscosity increase at 100 ° С,%
acid number, mg KOH / g
mass fraction of sediment,%
appearance of reactors and traps 56.4 4.45 0.0083 net 50.5 4.25 0.014 net 52.0 3.90 0.015 net 45.5 3.47 0.012 net 65.18
5.56
0.017 deposits on the walls (orange crystals) Thermo-oxidative stability according to GOST 23175, min More than 120 min 48 The tendency to coke formation according to FTM 791-3462 for 6 hours (plate temperature 290 ° C, oil temperature 120 ° C), mg 17.0 15.7 14.25 9.9 55.6

Claims (1)

A gas turbine lubricating oil composition containing tricresyl phosphate, a base polyalphaolefin oil, characterized in that the composition contains a (C ₁₃ -C ₁₅ ) alkyl ester of 3,5-bis (1,1-dimethylethyl) -4-hydroxybenzopropanoic acid, a toluene triazole derivative in as N, N-bis- (2-ethylhexyl) -4-methyl-1H-benzotriazole-1-methylamine, polymethylsiloxane in the following ratio, wt.%:
alkyl phenyl alpha naphthylamine 0.5-1.0 (C ₁₃ -C ₁₅ ) alkyl ester 3,5-bis- (1,1-dimethylethyl) - 4-hydroxybenzopropanoic acid 1.0-2.0 tricresyl phosphate or trixylene phenate 1.5-3.0 derivative of tolutriazole in the form of N, N-bis- (2-ethylhexyl) - 4-methyl-1H-benzotriazole-1-methylamine 0.1-3.0 polymethylsiloxane 0.002-0.006 base polyalphaolefin oil PAO-4 up to 100