RU2641005C1 - Turbine oil - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: oil contains, wt %: acid ester of alkenylsuccinic acid - 0.01-0.03; 2,6-di-tert-butyl-4-methylphenol- 0.48-0.60, the nitrogen-containing block copolymer of oxides of ethylene and propylene - 0.01-0.07; alkyltoluylalkylaminotriazole - 0.01, 0.02-0.03, 0.05; 2,6-dialkylphenol-p-ethylalkylate - 0.01, 0.03, 0.05; the condensation product of oleic acid with diethanolamine and boric acid, modified with potassium hydroxide - 0.32-0.40, and oil with a kinematic viscosity of 20-23 mm²/s at 50°C - the rest up to 100.

EFFECT: increasing the antioxidant properties of turbine oil and a corresponding reduction in its losses under the conditions of use.

2 tbl

Description

The invention relates to compositions of turbine oils used in oil systems for lubricating gas, steam, turbines, turbochargers, as a hydraulic fluid.

Known turbine oil of the following composition, wt.%: 2,6-di-tert-butyl-4-methylphenol - 0.2-1.0, pentadecylate acid ester - 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. % (RU No. 2058376, 1996).

Turbine oil of the following composition is known, wt.%: Alkenyl succinic acid ester - 0.01-0.03, 1- (diethylaminomethyl) benzotriazole - 0.01-0.1, 2,6-di-tert-butyl-4- methylphenol - up to 1.0, 3.3 ', 5.5'-tetra-tert-butyl-4.4'-dioxiphenylmethane - 0.1-2.0, mineral oil - up to 100 (RU No. 2144943, 2000) .

The oil may contain a demulsifying additive Diproxamine-157 - a nitrogen-containing block copolymer of ethylene and propylene oxides 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 (its prototype) is a turbine oil (Pat. No. 2458109, 2010) of the following composition, wt.%: 2,6-di-tert-butyl-4-methylphenol - up to 1.0, alkenyl succinic acid ester - 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, dialkyl dithiophosphate ester - 0.01-0.05, petroleum oil with kinematic viscosity at 50 ° C - 20-23 mm ² / s - up to 100. However, it has insufficiently high antioxidant properties.

The objective of the invention is to increase the antioxidant properties of turbine oil.

The problem is achieved in that turbine oil based on petroleum oil with a kinematic viscosity of 20-23 mm ² / s at 50 ° C, containing 2,6-di-tert-butyl-4-methylphenol, an acid ester of alkenyl succinic acid, a nitrogen-containing block the copolymer of ethylene oxide and propylene, alkyltoluenealkylaminotriazole, 2,6-dialkylphenol-p-ethylalkylate, according to the invention further comprises a condensation product of oleic acid with diethanolamine and boric acid, modified with potassium hydroxide, in the following ratio, wt.%:

2,6-di-tert-butyl-4-methylphenol 0.48-0.60 alkenyl succinic acid ester 0.01-0.03 a nitrogen-containing block copolymer of ethylene oxides and propylene 0.01-0.07 alkyltoluenealkylaminotriazole 0.01, 0.02-0.03, 0.05 2,6-dialkylphenol-p-ethylalkylate 0.01, 0.03, 0.05 oleic acid condensation product with diethanolamine and boric acid, hydroxide modified potassium 0.32-0.40 kinematic oil viscosity at 50 ° C 20-23 mm ² / s up to 100

The technical result achieved in this case is to increase the antioxidant properties of turbine oil.

The following is a description of the additives used:

- 2,6-di-tert-butyl-4-methylphenol (Agidol-1) - is produced according to TU 38.5901237-90, used as an antioxidant in oils, fuels and other products. Temperatures: melting 69.5-70, 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%;

- alkyltoluenealkylaminotriazole (Irgamet 39) - metal deactivator, produced by BASF. Kinematic viscosity at 40 ° C 70-90 mm ² / s, n _d ²⁰ = 1,503-1,513, density at 20 ° C 940-960 kg / m ³ ;

- 2,6-dialkylphenol-p-ethylalkylate (Irganox L 135) is a high molecular weight alkylphenol type antioxidant produced by BASF. Kinematic viscosity at 40 ° C 95-150 mm ² / s, acid number less than 10 mg KOH / g, n _d ²⁰ = 1.493-1.499, density at 20 ° C 950-990 kg / m ³ ;

- the synthesis of the condensation product of oleic acid with diethanolamine and boric acid, modified with potassium hydroxide, is carried out in two stages. At the first stage, an intermediate product is obtained (TU 2461-003-42408198-00) by heating the reaction mixture consisting of oleic acid, diethanolamine and boric acid (in a molar ratio, for example, 2: 3: 1, respectively) to 200-220 ° C with stirring until the evolution of H ₂ O ceases. The resulting intermediate product is modified by introducing KOH sodium hydroxide into the reaction mixture with constant stirring at a temperature of 160-170 ° C (when the content of the components, for example, 5 g of KOH per 100 g of product obtained on the first stage).

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, for example, I-20A industrial oil (GOST 17479.4-87) with an additive composition taken in the above concentrations. A sample of turbine oil prototype (Pat. No. 2458109, 2010) was prepared similarly. Examples of compositions of turbine oils are given in table. one.

The antioxidant properties of turbine oils were determined according to GOST 981 at a temperature of 150 ° C, an exposure time of 16 hours and an oxygen flow rate of 3 dm ³ / h by indicators: mass fraction of sediment, wt.%, Acid number, mg KOH / g and volatile acid content, wt.%.

The thermal oxidative stability of turbine oils was also evaluated using a PAPOK-R instrument according to STO Gazprom 2.2-4-134-2007. The oils were oxidized in steel cups under the influence of atmospheric oxygen at a high temperature of the device’s heating plate and the catalytic effect of the steel from which the cups were made at a device’s heating plate temperature of 180 ° C for 6 hours. The quality of the oils was evaluated:

- structural coefficient β _τ , which was calculated by the formula:

β _τ = Δν / X,

where Δν is the relative increase in kinematic viscosity,%; X is the volatility of the oil during oxidation,%;

on the instability factor characterizing the change in the operational properties of lubricating oil in the process of its oxidation, determined by the formula:

F _n = β _τ ⋅С _{> С = 0} ,

where F _n is the instability factor, rel. units; β _τ - structural coefficient, rel. units; C _{> C = 0} is the content of oxidation products formed in the oil, rel. units

The oxidation resistance test was also carried out in a rotating pressure chamber (RPVOT) according to ASTM D2272. The samples were oxidized in the presence of water and in the presence of a copper catalyst in a stainless steel oxidation vessel at an initial pressure of 0.63 MPa. The vessel rotated at a speed of 100 rpm at a constant temperature of 150 ° C. The time required for a pressure drop (0.175 MPa) was an indicator of the oxidative stability of turbine oils.

Indicators of turbine oils characterizing their antioxidant properties are shown in table 2.

From table 2 it follows that the inventive turbine oil with kinematic viscosity at 50 ° C 20-23 mm ² / s in examples 2-4 (table 1) is superior in antioxidant properties to turbine oil according to the prototype (Pat. No. 2458109, 2010).

The use of turbine oil according to the proposed formulation will reduce the consumption of turbine oil and increase the life of the equipment without additional repair.

Claims (2)

Turbine oil based on petroleum oil with a kinematic viscosity of 20-23 mm ² / s at 50 ° C, containing 2,6-di-tert-butyl-4-methylphenol, an acid alkenyl succinic ester, a nitrogen-containing block copolymer of ethylene and propylene oxides, alkyltoluenealkylaminotriazole, 2,6-dialkylphenol-p-ethylalkylate, characterized in that it further comprises a condensation product of oleic acid with diethanolamine and boric acid, modified with potassium hydroxide, in the following ratio, wt.%: 2,6-di-tert-butyl-4-methylphenol 0.48-0.60 alkenyl succinic acid ester 0.01-0.03 a nitrogen-containing block copolymer of ethylene oxides and propylene 0.01-0.07 alkyltoluenealkylaminotriazole 0.01, 0.02-0.03, 0.05 2,6-dialkylphenol-p-ethylalkylate 0.01, 0.03, 0.05 oleic acid condensation product with diethanolamine and boric acid, hydroxide modified potassium 0.32-0.40 kinematic oil viscosity 20-23 mm ² / s at 50 ° C up to 100