RU2505591C1 - Lubricating oil for gas turbines - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to composition of lubricating oil for gas turbines which contains 2,6-di-tert-butyl-para-cresol 0.5-1.5; antioxidant phenol- or amine-type high-molecular weight additives 0.1-1.0; acid ester of alkyldithiophosphoric acid 0.005-0.02; aryl esters of phosphoric acid 0.2-0.6; polymethylsiloxane 0.001-0.005; a solution of polymethacrylate in mineral oil 0.03-0.07; light isoparaffin oil 30.0-70.0; isoparaffin base oil - the balance.

EFFECT: improved tribological properties and thermal oxidative stability at high temperatures.

3 cl, 4 ex, 2 tbl

Description

The present invention relates to oil refining and petrochemicals, 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.

Known oil for marine gas turbines according to GOST 10289 of the following composition in wt%: 2,6-ditretbutylparacresol 0.5-0.8, chlorine-containing antiwear additive - chlorinated diphenyl 0.8-1.2, mineral oil up to 100 (Gorelov V .I. Operation of ship gas turbine units. - M.: Military Publishing House of the Ministry of Defense of the USSR, 1972, p. 155-1561).

The disadvantages of lubricating oil of this composition is the low flash point (not lower than 135 ° C), a low level of tribological characteristics.

Also known is a lubricating oil for gas turbines of the following composition in wt%: base mineral oil, 2,6-ditretbutylparacresol 0.01-2.0, N-phenyl-α-naphthylamine 0.05-2.0, tricresyl phosphate or diphenyl- para-tert-butyl phenyl phosphate 0.5-5.0, benzotriazole (0.005-0.2), an oily solution of polyalkyl methacrylate with a molecular weight of 2000-8000 - 0.01-2.0 (RU 2086609, CL. C10M 161/00, published on 08/10/1997).

The disadvantages of the oil of this composition is the low level of thermal oxidative stability at temperatures above 150 ° C and tribological characteristics.

The closest in composition and technical result to the claimed lubricating oil is a lubricating oil for gas turbines of the following composition in wt%: 2,6-ditretbutylparacresol - 0.7-1.0, aryl esters of phosphoric acid-1.0-3, 0, amino derivatives of antioxidant additives - 0.1-0.5, benzotriazole - 0.005-0.015, base oil - the rest. (RU 2125084, class C10M 141/10, publ. 01.20.1999)

The disadvantages of this oil are a low level of thermal oxidative stability at temperatures above 150 ° C and tribological characteristics.

The technical result of the present invention is the improvement of thermal oxidative stability at temperatures above 150 ° C and tribological properties.

To achieve the technical result, a lubricating oil for gas turbines is proposed, containing 2,6-ditretbutylparacresol, aryl esters of phosphoric acid, antioxidant high molecular weight additives of the amine or phenolic type, an acid ester of alkyl dithiophosphoric acid, polymethylsiloxane, a solution of polymethacrylate in mineral oil, light isopar oil base isoparaffin oil in the following ratio of components in% mass .:

2,6-ditretbutylparacresol 0.5-1.5; high molecular weight antioxidant additives phenolic or amine type 0.1-1.0; alkyldithiophosphoric acid ester 0.005-0.02; phosphoric acid aryl esters 0.2-0.6; polymethylsiloxane 0.001-0.005; solution of polymethacrylate in mineral oil 0.03-0.07; light isoparaffin oil 30.0-70.0; isoparaffin base oil rest.

As the antioxidant high molecular weight additives of the phenolic type, the proposed lubricating oil composition contains β- (3,5-ditretbutyl-4-hydroxyphenyl) propionic acid alkyl ester, and secondary aromatic amines as the high molecular weight amine type additives. for example, a mixture of butyl and octyldiphenylamines. or phenyl-α-naphthylamine.

For the preparation of lubricating oil compositions use:

- 2,6-ditretbutylparacresol (Agidol-1 according to TU 38.5901237-90), a white crystalline substance with a melting point of 69.5-69.7 ° C;

- an antioxidant additive of the phenolic type - (C ₇ -C ₉ ) β- (3,5-ditretbutyl-4-hydroxyphenyl) propionic acid alkyl ester Irganox L 135 manufactured by BASF / Ciba (or its analog Naugalube 531 manufactured by Chemtura), representing are transparent liquids with a yellowish tint with a flash point in a closed crucible of at least 152 ° C, or (C ₁₃ -C ₁₅ ) β- (3,5-ditretbutyl-4-hydroxyphenyl) propionic acid alkyl ester Naugalube 38 manufactured by Chemtura as a clear liquid with a yellowish tint with a flash point in a closed crucible of at least 229 ° C; or an amine type antioxidant - a mixture of butyl and octyl diphenylamines - Irganox L 57 manufactured by BASF / Ciba (or its analogue Naugalube 640 manufactured by Chemtura) in the form of a clear liquid from yellow to reddish brown with a flash point in an open crucible of at least 185 ° C or phenyl-α-naphthylamine Neozone-A according to TU 6-14-202-74 (or its analogue Naugard PANA manufactured by Chemtura), which is a crystalline substance with a melting point of 54 ° C;

- Alkyldithiophosphoric acid ester: HiTEC 511T manufactured by Afton Chemical in the form of a liquid from orange to yellow with a flash point in a closed crucible of at least 95 ° C;

- aryl esters of phosphoric acid: tricresyl phosphate according to GOST 5728-76 (it is possible to use the Durad 125 analog manufactured by Chemtura) or Durad 220X trixelinyl phosphate manufactured by Chemtura in the form of yellowish transparent liquids with a flash point of at least 240 ° C;

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

- a solution of polymethacrylate in mineral oil: LUKOIL LLK-2508-3 according to TU 0257-005-79345251-2007 - a liquid with a kinematic viscosity at 100 ° C - 1100-1550 mm ² / s;

- light isoparaffin oil produced by LUKOIL Volgogradneftepererabotka LLC (STO PR 046-00148599-2011) with a flash point in an open crucible above 165 ° C, pour point not higher than minus 35 ° C;

- LUKOIL VHVI-4 base isoparaffin oil (TU 0253-026-00148599-2002) with a flash point in an open crucible above 224 ° C, a pour point not higher than minus 15 ° C and a kinematic viscosity at 100 ° C of 3.9- 4.6 mm ² / s.

The oil preparation technology of the composition proposed in the present invention consists of the following operations: dosing additives, mixing the oil base with additives until they are completely dissolved, filtering the finished oil. For testing, oil samples were prepared, the composition of which is given 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 in 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 — to improve the tribological characteristics — the value for the indicator “critical load, Pk” compared with the prototype. The use of isoparaffin base components and a set of antioxidant additives can increase the level of thermal oxidative stability at temperatures above 150 ° C.

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 2,6-ditretbutylparacresol 0.5 1,0 0.89 1,50 (C ₁₃ -C ₁₅ ) β- (3,5-Ditretbutyl-4-hydroxyphenyl) propionic acid alkyl ester 0.1 - 0.20 - (C ₇ -C ₉ ) β- (3,5-ditretbutyl-4 hydroxyphenyl) propionic acid alkyl ester - 0.24 - 1,0 mixture of butyl and octyl diphenylamines - - 0.30 - phenyl-α-naphthylamine - - - 0.11 alkyldithiophosphoric acid ester 0.005 0.01 0.01 0.02 phosphoric acid aryl esters 0.2 0.4 0.4 0.6 solution of polymethacrylate in mineral oil 0,03 0.05 0.05 0,07 polymethylsiloxane 0.001 0.004 0.005 0.005 Base oil incl. up to 100 up to 100 up to 100 up to 100 light isoparaffin oil thirty 55 55 70 isoparaffin base oil 70 45 45 thirty

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 1. Kinematic viscosity according to GOST 33 at 50 ° C, mm ² / s 9.16 9.16 9.16 9.1 8.33 2. Acid number according to GOST 5985, mg KOH / g 0.024 0,026 0,025 0,025 0,03 3. Tribological characteristics according to GOST 9490: critical load, R _K , N 735 735 735 735 490 wear spot diameter at axial load 196 N, D _I , mm 0.35 0.36 0.36 0.36 0.35 4. Thermo-oxidative stability according to GOST 23797 at 175 ° C for 50 hours (air flow 10 l / h): increase in kinematic viscosity,% 4.32 5.78 7.57 7.01 I can’t stand it. Heavy sedimentation acid number, mg KOH / g 0.18 0.12 0.13 0.12 mass fraction of sediment,% 0.007 0.009 0.008 0.009

Claims (3)

1. Lubricating oil for gas turbines, containing 2,6-ditretbutylparacresol, aryl esters of phosphoric acid, antioxidant high molecular weight additives of the amine or phenolic type, acid ester of alkyldithiophosphoric acid, polymethylsiloxane, a solution of polymethacrylate in mineral oil, light isoparafin oil the following ratio of components, wt.%:
2,6-ditretbutylparacresol 0.5-1.5 high molecular weight antioxidant additives phenolic or amine type 0.1-1.0 alkyldithiophosphoric acid ester 0.005-0.02 phosphoric acid aryl esters 0.2-0.6 polymethylsiloxane 0.001-0.005 solution of polymethacrylate in mineral oil 0.03-0.07 light isoparaffin oil 30.0-70.0 isoparaffin base oil rest 2. Lubricating oil for gas turbines according to claim 1, which as an antioxidant high molecular weight additive of the amine type contains a mixture of butyl and octyl diphenylamines or phenyl-α-naphthylamine. 3. Lubricating oil for gas turbines according to claim 1, which contains phenol-type C ₁₃ -C ₁₅ -alkyl ester of β- (3,5-ditretbutyl-4-hydroxyphenyl) propionic acid or C ₇ -C ₉ as antioxidant high molecular weight phenolic additives β- (3,5-Ditretbutyl-4-hydroxyphenyl) propionic acid alkyl ester.