RU2505590C1 - Lubricating oil for gas turbines - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to composition of lubricating oil for gas turbines which contains the following, wt %: 2,6-di-tert-butyl-para-cresol 0.1-2.0; amino-derivative antioxidant additive 0.1-2.0; mixture of mono- and di-glycerides of β-(3,5-di-tert-butyl-4-oxyphenyl)propionic acid 0.5-2.0; liquid chlorinated paraffins 0.2-0.6; polymethylsiloxane 0.001-0.005; light isoparaffin oil 10.0-45.0 and mineral oil - the balance.

EFFECT: reduced volatility and corrosive action on silver.

2 cl, 2 tbl, 3 ex

Description

The present invention relates to both 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 (% mass): 2,6-ditretbutylparacresol (0.5-0.8), chlorinated diphenyl (0.8-1.2), mineral oil up to 100 [1] . The disadvantages of this lubricating oil are low flash point (not lower than 135 ° C), low level of tribological characteristics, high level of evaporation.

The closest in composition and technical result achieved to the claimed lubricating oil is a lubricating oil for gas turbines [2. RF patent RU №2125084 C1, C10М 141/10, publ. 01/20/1999] the following composition (% of mass): 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.

The disadvantages of this lubricating oil is a high level of volatility at a temperature of 175 ° C and increased corrosion effects on silver parts due to sulfide corrosion.

The technical result of the present invention is to reduce the evaporation and corrosive effects on silver.

To achieve the technical result, a lubricating oil for gas turbines is proposed, containing a base mineral oil, 2,6-ditretbutylparacresol, an amino derivative antioxidant additive, a mixture of mono- and di-glycerides of β- (3,5-tert-butyl-4oxyphenyl) propionic acid, liquid chlorinated paraffins, polymethylsiloxane, light isoparaffin oil in the composition of the base mineral oil in the following ratio of components (% mass):

2,6-itretbutylparacresol 0.1-2.0; amino derivative antioxidant additive 0.1-2.0; mixture of mono- and di-glycerides of β- (3,5ditretbutyl-4oxyphenyl) propionic acid 0.5-2.0; chlorinated liquid paraffins 0.2-0.6; polymethylsiloxane 0.001-0.005; light isoparaffin oil 10.0-45.0; mineral oil Rest

For the preparation of lubricating oil compositions use:

-2,6-ditretbutylparacresol (Agidol-1 according to TU 38.5901237-90);

- amino derivative antioxidant additive - alkylated phenyl-α-naphthylamine - Irganox L06 or a mixture of butyl- and octyl diphenylamines - Irganox L57 manufactured by BASF / Ciba (instead of Irganox L57 it is possible to use its analogue - Naugalube 640 manufactured by Chemtura); a mixture of mono- and di-glycerides of β- (3,5ditretbutyl-4oxyphenyl) propionic acid (friction modifier / antioxidant Irgalube F10 manufactured by BASF / Ciba);

- chlorinated liquid paraffins (KP-470A1 according to TU 2493-379-05763441-2002); -polymethylsiloxane (PMS-200A according to OST 6-02-20-79);

- light isoparaffin oil produced by LUKOIL Volgogradneftepererabotka LLC (STO PR 046-00148599-2011);

- mineral oil - spindle oil AU (TU 38. 1011212-89).

The technology for preparing the proposed oil 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 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 strictly defined quantitative ratio of the components in the composition of the oil proposed in the present invention allows to obtain the claimed technical result

- reduce evaporation at a temperature of 175 ° C, which reduces oil operating costs for waste;

- reduce the corrosion effect on parts made of silver and, as a result, increase the service life of bearing cages for gas turbine units coated with silver.

The use of the claimed composition of lubricating oil allows to ensure 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 Examples of oil compositions of the present invention Name of components Oil Example 1 Oil Example 2 Oil Example 3 2,6-ditretbutylparacresol 0.1 1.25 2.0 amino derivative antioxidant additive 0.1 0.17 2.0 mixture of mono- and di-glycerides of β- (3,5ditretbutyl-4oxyphenyl) propionic acid 0.5 0.6 2.0 chlorinated liquid paraffins 0.2 0.5 0.6 polymethylsiloxane 0.001 0.002 0.005 Base mineral oil, including Up to 100 Up to 100 Up to 100 including light isoparaffin oil 10 thirty 45

table 2 Comparative characteristics of the proposed composition of the lubricating oil Name of indicator Oil example No. 1 Oil example No. 2 Oil example No. 3 Prototype Oil 1. Kinematic viscosity according to GOST 33 at 50 ° C mm ² / s 8.62 8.56 8.60 8.33 2. Acid number according to GOST 5985, mg KOH / g oil 0.012 0.011 0.010 0,03 4. Corrosive effect on metals in accordance with GOST 2917. Appearance of silver plates Ср 99.9 (GOST 6836) after thermostating at 175 ° C for 15 hours. Slight light brown tint Slight tan Slight tan Strong blackening 5. Evaporation in cups according to GOST 20354 at 175 ° C for 3 hours,% 21.70 23.87 25.69 30.82

Claims (2)

1. Lubricating oil for gas turbines, containing a base mineral oil, 2,6-ditretbutylparacresol, an amino derivative antioxidant additive, a mixture of β- (3,5-ditretbutyl-4-hydroxyphenyl) propionic acid mono- and di-glycerides, chlorinated liquid paraffins, polymethylsiloxane, light isoparaffin oil in the composition of the base mineral oil in the following ratio of components, wt.%:
2,6-ditretbutylparacresol 0.1-2.0 amino derivative antioxidant additive 0.1-2.0 mixture of mono- and di-glycerides of β- (3,5-ditretbutyl-4-hydroxyphenyl) propionic acid 0.5-2.0 chlorinated liquid paraffins 0.2-0.6 polymethylsiloxane 0.001-0.005 light isoparaffin oil 10.0-45.0 mineral oil rest 2. Lubricating oil for gas turbines according to claim 1, which contains an alkylated phenyl-α-naphthylamine Irganox L06 or a mixture of butyl and octyl diphenylamines Irganox L57 as an amino derivative of an antioxidant.