RU2458109C2 - Turbine oil - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: turbine oil contains the following in wt %: 2,6-di-tert-butyl-4-methylphenol - 0.8-1.0, acid ester of alkenyl succinic acid - 0.01-0.03, nitrogen-containing block-copolymer of ethylene and propylene oxides - 0.01-0.07, alkyltoluene alkylaminotriazole - 0.01-0.05, 2,6-dialkylphenol-p-ethylalkylate - 0.1-0.5, alkylthiophosphate ether - 0.01-0.05, petroleum oil with kinematic viscosity at 50°C of 20-23 mm²/s - up to 100.

EFFECT: improved demulsifying properties and high antioxidant stability.

2 tbl, 7 ex

Description

The invention relates to compositions of turbine oils used in oil systems for the lubrication of gas, steam turbines, turbochargers, as a hydraulic fluid in the control systems of these units.

Known turbine oil (US No. 3785975, 1974) containing the antioxidant 2,6-di-tert-butyl-4-methylphenol and an anti-rust additive.

Known turbine oil (SU No. 288213, 1970) composition, wt.%: Polysiloxane liquid PMS-200A - up to 0.005, pentadecylate acid ester - up to 0.02, diproxamine-157 - up to 0.01, ionol - up to 1.00 oil base - up to 100.

Known turbine oil (SU No. 810768, 1981) composition, wt.%: 2,6-di-tert-butyl-4-methylphenol 0.2-1.0, quinizarin 0.01-.0.05, acid alkenylate acids 0.02-0.1, polyoxypropylene glycol ether of ethylenediamine or propylene glycol or alkyl phenol - 0.02-0.2, polymethylsiloxane 0.003-0.005, oil - up to 100.

Known turbine oil (RU No. 2058376, 1996) of the following composition, wt.%: 2,6-di-tert-butyl-4-methylphenol 0.2-1.0, acid ester of pentadecylate acid 0.01-0.1, 1- (diethylaminomethyl) benzotriazole 0.01-0.2, mineral oil up to 100. The oil may contain a nitrogen-containing block copolymer of ethylene and propylene oxides in an amount of 0.01-0.05 wt.%.

Known turbine oil (RU No. 2144943, 2000) of the following composition, wt.%: Alkenyl succinic acid ester 0.01-0.03, 1- (diethylaminomethyl) benzotriazole 0.01-0.1, 2,6-di-tert -6utyl-4-methylphenol - up to 1.0, 3.3 ^/ , 5.5 ^/ -tetra-tert-butyl-4.4 ^/ -dioxidiphenylmethane 0.1-2.0, mineral oil - up to 100. Oil can contain demulsifying additive Diproxamine-157 - a nitrogen-containing block copolymer of ethylene oxide and propylene in an amount of 0.01-0.07 wt.%, and to improve antifoam properties under operating conditions may contain polymethylsiloxane (PMS-200A) in an amount of 0.003-0.005 wt. .%

The disadvantages of the above oils are low stability against oxidation and poor demulsifying properties.

Closest to the proposed oil is Tp-22 turbine oil (grade 1) according to TU 38.101821-2001 (Pat. No. 2114157, 1997) of the following composition, wt.%: Agidol-1 (Ionol) 0.2-0.8 , alkenyl succinic acid ester (additive B 15/41) 0.01-0.05, a nitrogen-containing block copolymer of ethylene and propylene oxides (Diproxamine-157) 0.01-0.03 and alkyltoluene alkylaminotriazole (Irgamet 39) 0.005-0, 1, petroleum oil - up to 100.

The disadvantages of this oil are both unsatisfactory antioxidant and antiwear properties, as well as low demulsifying ability.

The objective of the invention is to improve the operational characteristics of turbine oil.

The problem is achieved by creating a turbine oil based on petroleum oil with a kinematic viscosity at 50 ° C of 20-23 mm ² / s, containing 2,6-di-tert-butyl-4-methylphenol, an acid ester of alkenylate acid, a nitrogen-containing block copolymer of oxides ethylene and propylene, alkyltoluenealkylaminotriazole, which according to the invention additionally contains 2,6-dialkylphenol-p-ethylalkylate and alkylthiophosphate ester in the following ratio, wt.%:

2,6-di-tert-butyl-4-methylphenol - 0.8-1.0,

alkenyl succinic acid ester - 0.01-0.03,

nitrogen-containing block copolymer of ethylene oxide and propylene - 0.01-0.07,

alkyltoluenealkylaminotriazole - 0.01-0.05,

2,6-dialkylphenol-p-ethylalkylate - 0.1-0.5,

alkyl thiophosphate ester - 0.01-0.05,

kinematic oil

viscosity at 50 ° С 20-23 mm ² / s - up to 100.

The technical result achieved in this case is to improve the demulsifying properties of turbine oil, as well as to increase antioxidant stability. In addition, there is an improvement in the antiwear properties of turbine oil.

The following are the characteristics of the additives used:

- 2,6-di-tert-butyl-4-methylphenol (Ionol) - is produced according to TU 38.5901237-90, used as an antioxidant in oils, fuels and other products. Temperature: melting 69.5-70 ° C, crystallization 69 ° C;

- alkenyl succinic acid ester (anti-rust additive B-15/41) - is produced according to TU 6-14-866-86, used in oils. It is a liquid from light yellow to brown in color with an acid number of 180-205 mg KOH / g;

- nitrogen-containing block copolymer of ethylene and propylene oxides (Diproxamine-157) - is produced according to TU 6-14-614-76, used as a demulsifier in oils and oils. The nitrogen content is 0.50-0.55%, the hydrogen index is not less than 10.5, the ash content is 0.5%;

, плотность при 20°С 940-960 кг/м³;- alkyltoluenealkylaminotriazole (Irgamet 39) - metal deactivator, produced by Ciba according to the specification PS-184210 Version 6. Kinematic viscosity at 40 ° C 70-90 mm ² / s, total alkaline number 138-155 mg KOH / g,

, density at 20 ° С 940-960 kg / m ³ ;

1,493-1,499, плотность при 20°С 950-990 кг/м³;- 2,6-dialkylphenol-p-ethylalkylate (Irganox L 135) is a high molecular weight alkylphenol type antioxidant produced by Ciba according to specification PS-193. Kinematic viscosity at 40 ° C 95-150 mm ² / s, acid number - less than 10 mg KOH / g,

1.493-1.499, density at 20 ° C 950-990 kg / m ³ ;

не более 1,550, плотность при 20°С не более 1150, температуры самовоспламенения 390°С, вспышки в закрытом тигле 95°С (прибор Пенски-Мартенса), содержание фосфора 9-10 мас.% содержание серы 18-20 мас.% (Afton Chemical. HiTEC 511T Perfomance Additive. Паспорт безопасности на материал. Preparation information, 07.11.2008; US 2010/0009881, 14.01.2010).- alkyl thiophosphate ester (Hitec 511T) is an ashless anti-wear additive developed by Afton Chemical. Liquid from orange to yellow, kinematic viscosity at 40 ° C 95 mm ² / s, acid number not more than 175 mg KOH / g,

no more than 1,550, density at 20 ° С no more than 1150, autoignition temperature 390 ° С, flashes in a closed crucible 95 ° С (Pensky-Martens device), phosphorus content 9-10 wt.% sulfur content 18-20 wt.% ( Afton Chemical. HiTEC 511T Performance Additive. Material Safety Data Sheet. Preparation information, 11/7/2008; US 2010/0009881, 01/14/2010).

The described oil is prepared by mixing at 20-40 ° C oil with a kinematic viscosity at 50 ° C of 20-23 mm ² / s with additives taken in the above concentrations.

Oil samples are prepared according to examples 1-7 (table 1) and subjected to tests to determine the time of demulsification (τ _d ), according to GOST 12068, stability against oxidation according to GOST 981 with an estimate of the acid number (r.h.), the mass fraction of the precipitate and volatile acids after oxidation, as well as lubricity according to GOST 9490.

The compositions of turbine oils and the results of comparative tests are presented in tables 1 and 2.

From table 2 it follows that the time of demulsification after adding additives improves by 2.3 times, the stability of turbine oil against oxidation increases (there is a decrease in acid number, sedimentation and the release of low molecular weight acids), and tribological parameters of turbine oil are also improved (the diameter of the wear spot decreases, increase in scoring index, critical load and weld load). Improving the demulsifying properties of the oil reduces its loss with separated water condensate.

A sharp improvement in demulsifying (and at the same time antioxidant properties) with the addition of additives for other functional purposes is an unobvious effect.

A significant improvement in the operational characteristics of turbine oil is observed only at optimal concentrations of additives.

Based on the test results obtained, the optimal ranges of additive concentrations were selected.

Thus, the lower limit of additive concentrations of 2,6-dialkylphenol-p-ethylalkylate (Irganox L 135) and alkylthiophosphate ester (Hitec 511T) is determined by the possibility of achieving a minimum time for removing water from the oil and achieving high antioxidant values for turbine oil. The upper limit is determined by the period of time the water is removed from the turbine oil and its antioxidant properties, which practically do not change with a further certain increase in the concentration of additives (see data on composition 5 of Tables 1-2) and, therefore, such an increase becomes economically inexpedient.

Turbine oil containing additives in quantities that go beyond the specified concentrations does not have the necessary quality characteristics. Only at a certain concentration of additives is a synergistic effect observed - a decrease in the demulsification time and an increase in the antioxidant stability of turbine oil.

Thus, the described turbine oil has an improved quality, in particular, enhanced demulsifying, antioxidant, antiwear properties.

Table 1 Turbine Oil Composition No. p / p Name of components Composition, wt.% one 2 3 four 5 6 7 Famous TP-22 oil from brand 1 one 2,6-Di-tert-butyl-4-methylphenol (Ionol additive) 0.7 0.8 0.9 1,0 1,1 0.9 0.9 0.8 2 Sour alkenylsuccinic acid ester (Additive _15/41) 0.009 0.01 0.02 0,03 0.04 0.02 0.02 0.02 3 Nitrogen-containing block copolymer of ethylene and propylene oxides (Diproxamine 157 additive) 0.009 0.01 0.04 0,07 0.08 0.04 0.04 0,03 four Alkyltoluenealkylaminotriazole (additive Irgament 39) 0.009 0.01 0,03 0.05 0.06 0,03 0,03 0.05 5 2,6-Dialkylphenol-p-ethylalkylate (additive Irganox L 135) 0.08 0.10 0.20 0.50 0.60 0.50 - - 6 Alkylthiophosphate ester (Hitec 511T) 0.009 0.010 0,030 0.05 0.06 - 0,03 - 7 Kinematic viscosity oil at 50 ° C 20-23 cst Up to 100

table 2 Turbine oil performance No. p / p Quality indicators The composition according to table 1 one 2 3 four 5 6 7 Famous TP-22 oil from brand 1 one Stability against oxidation at 150 ° C, 16 h and an oxygen consumption of 3 dm ³ / h: - mass fraction of sediment, wt.% 0.006 0.002 0.002 0.002 0.002 0.006 0.006 0.006 - acid number, mg KOH / g 0.10 0.06 0.06 0.06 0.06 0.10 0.10 0.10 - volatile acids, mg KOH / g. 0.08 0,03 0,03 0,03 0,03 0.08 0.08 0.08 2 The time of demulsification, s 118 52 52 52 52 118 118 120 3 Lubricity (CWM): - diameter of the wear spot, mm at a load of 63 kgf 1.99 0.39 0.39 0.39 0.39 1.99 1.55 1.99 - badass index 19.6 23.3 23.3 23.3 23.3 19.6 20.8 19.6 - critical load, kgf 56 63 63 63 63 56 58 56 - welding load, kgf 112 119 119 119 119 112 114 112

Claims (1)

Turbine oil based on petroleum oil with a kinematic viscosity at 50 ° C of 20-23 mm ² / s, containing 2,6-di-tert-butyl-4-methylphenol, alkenyl succinic acid ester, nitrogen-containing block copolymer of ethylene and propylene oxides, alkyltoluenealkylaminotriazole, characterized in that it further comprises 2,6-dialkylphenol-p-ethylalkylate and alkylthiophosphate ester in the following ratio, wt.%:
2,6-di-tert-butyl-4-methylphenol 0.8-1.0 alkenyl succinic acid ester 0.01-0.03 nitrogen block copolymer ethylene and propylene oxides 0.01-0.07 alkyltoluenealkylaminotriazole 0.01-0.05 2,6-dialkylphenol-p-ethylalkylate 0.1-0.5 alkyl thiophosphate ester 0.01-0.05 kinematic oil viscosity at 50 ° С 20-23 mm ² / s up to 100