RU2284346C2 - Dielectric oil - Google Patents

Abstract

FIELD: dielectric oils used in insulation of electric engines of immersion pumps in petroleum output.

SUBSTANCE: proposed oil comprises the following components, wt.-%: hydrogenated poly-alpha-olefins of molecular mass 400-1000 Da, 0.1-99.7; antioxidant addition agent of phenolic and/or amine type, 0.1-1.0; alkylphosphates and/or trialkylphenylphosphites, 0.1-2.0, and petroleum oil, up to 100. Proposed oil provides improving electric indices and lubricating properties and providing electric engines work at temperature 160-170°C.

EFFECT: improved and valuable properties of oil.

1 tbl, 15 ex

Description

The invention relates to electrical insulating oils used for insulation of electric motors of submersible pumps used in oil production.

It is known that for these purposes both conventional transformer oils, such as GK, T-1500, and special oils are used - MAPED (TU 38.101579-75), MDPE (TU 38.401778-89), which basically represent these or those fractions of transformer oils. The disadvantage of these oils are insufficiently high electrical insulating properties and low oxidation stability.

A known method of producing insulating oil for ultra-high-voltage cables and equipment by thickening low-viscosity oil with a high molecular weight viscosity additive, in particular polyisobutylene with an MM of more than 20,000, and the addition of an antioxidant additive - ionol [a.s. USSR No. 239488, IPC S 10 M, BI No. 11, 1969]. However, this oil is not applicable for filling electric motors of submersible pumps due to the increased viscosity and insufficiently high electrical insulation properties. In addition, the introduction of a thickening additive presents serious difficulties, since it is necessary to carry out prolonged mixing of the oil with polyisobutylene or to dissolve the polyisobutylene in a suitable solvent and mix the base with the polymer concentrate. These techniques complicate the technology and do not allow to achieve the required electrical performance.

The closest analogue of the proposed composition is electrical insulating oil used to isolate the electric motors of submersible pumps used in oil production (US Pat. RF No. 2169173, IPC 10 M, BI No. 17, 2001). Oil contains: polyisobutylene m.m. 1000-5000 0.1-20.0% wt., Antioxidant additive of phenolic or amine type 0.1-0.5% wt. and petroleum oil up to 100% wt. Petroleum oil is obtained from the products of the hydrocatalytic processing of paraffin-containing raw materials. The oil has not bad electrical performance, stability to oxidation and safety in operation. However, this oil has insufficient heat resistance and can be used at operating temperatures up to 120 ° C. In addition, improve the lubricating properties of the oil, as it is not only an insulating, but also a lubricating medium.

The objective of the invention is the production of electrical insulating oil for electric motors of submersible pumps with improved electrical performance, stability to oxidation, improved lubricating properties and heat resistance, which increases the safety of operation.

The objective is achieved in that the insulating oil containing petroleum oil, a polymer, an antioxidant additive of phenolic and / or amine type additionally contains alkyl phosphates and / or trialkyl phenyl phosphites, and hydrogenated polyalphaolefins of molecular weight 400 ÷ 1000 are used as a polymer in the following ratio of components,% wt. :

Hydrogenated polyalphaolefins, m. 400-1000 0.1-99.7 Phenolic Antioxidant Additive and / or amine type 0.1-1.0 Alkyl phosphates and / or trialkyl phenyl phosphites 0.1-2.0 Petroleum oil up to 100

The hydrocarbon fraction of the hydrocatalytic processing of paraffin-containing raw materials is used as petroleum oil.

The following components were used in the composition:

- hydrogenated polyalphaolefins m.m. 400-1000 according to TU 38.4011093-2003;

- 4-methyl-2,6-ditretic butylphenol (agidol 1) according to TU 38.5901237-90, and / or diphenylamine according to TU 6-09-5467-90;

tributyl phosphate according to TU 6-02-733-84, and / or tricresyl phosphate according to GOST 5728-76, and / or trixylene phenate according to TU 6-05-161-78, and / or trialkyl phenyl phosphites according to TU 6-02-680-77;

- petroleum oil according to TU 38.301-29-41-95.

The table shows the physico-chemical and electrical characteristics of the proposed insulating oil (examples 2-4, 7-10, 12-14) and prototype (example 15).

From the presented data it can be seen that the oil obtained by the proposed method has improved electrical performance compared to the prototype, higher oxidation stability, increased heat resistance and improved lubricating properties.

The use of hydrogenated polyalphaolefins in combination with antioxidant additives and alkyl phosphates significantly improves not only the thermo-oxidative stability, lubricating properties of the proposed composition, but also the electrical insulating properties and heat resistance.

The mixture of petroleum oil with hydrogenated polyalphaolefin is produced in a known manner at a temperature of 90-110 ° C, then the remaining additives are introduced into the oil. The electrical insulating oil thus obtained can be further subjected to adsorption purification. For cleaning, bleaching clays, aluminosilicate chips are used. The electric insulating oil obtained in this way has an increased flash point (up to 235 ° C), improved electrical properties and lubricating properties, and also ensures the operation of electric motors at a temperature of 160-170 ° C.

Table Name Examples one 2 3 four 5 6 7 8 9 10 eleven 12 13 fourteen 15 (prototype) one 2 3 four 5 6 7 8 9 10 eleven 12 13 fourteen fifteen 16 The content of components in% wt. Polyalphaolefins m. 400-1000: 416 98.5 44.9 47.0 60.5 59,4 67.5 35.0 40,2 40,0 40,2 - 10 - - - 616 - 40,0 50,0 - 40,0 20,0 40,0 40,0 38.5 40,0 - - 1,0 - - 1115 - 10.0 - 30,0 - 10.0 20,0 10.0 10.0 10.0 - - - 0.1 - Agidol-1 - - - - - - 0.5 0.3 0.5 0.5 0.5 1,0 - 1,0 0.3 Diphenylamine 0.05 0.1 0.5 1,0 0.5 - - 0.2 - - - - 1,0 - - Tributyl phosphate 0.05 1,0 0.5 0.1 - 1,0 - - - - 1,0 2.0 - - - Tricresyl phosphate - - - - - - 0.5 1,0 - - - - - - - Trixylene phenate - - - - - - - - - 1,0 - - 2.0 2.0 - Trialkylphenylphosphite - - - - - - 0.5 - 1,0 - - - - - - Polyisobutylene m.m. 1000-5000 - - - - - - - - - - - - - - 10.0 Petroleum oil up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 up to 100 Indicators 1. The kinematic viscosity, mm ² / s at 50 ° C 20,0 22.0 20,0 24.0 21.0 24.0 25.0 24.6 22.5 24.3 16,0 20,0 20,2 20.1 21.0 2. T. flash in an open crucible, ° C 218 230 225 230 230 230 234 232 231 232 160 218 220 219 161

one 2 3 four 5 6 7 8 9 10 eleven 12 13 fourteen fifteen 16 3. T. solidification, ° C -55 -51 -52 -fifty -51 -fifty -51 -52 -fifty -52 -fifty -54 -52 -53 -52 4. Acid number, mg KOH / g 0.015 0.012 0.011 0.010 0.012 0.016 0.010 0.011 0.011 0.011 0.012 0.012 0.010 0.010 0,020 5. The dielectric loss tangent at 50 Hz, 90 ° C,% 0.4 0.19 0.18 0.18 0.20 0.21 0.18 0.17 0.19 0.18 0.5 0.19 0.19 0.19 0.23 6. The diameter of the wear spot, mm 0.45 0.29 0.30 0.32 0.50 0.35 0.29 0.29 0.30 0.29 0.4 0.34 0.33 0.33 0.65 7. Resistance to oxidation at 120 ° C in accordance with GOST 981 - acid number of oxidized oil, mg KOH / g 0,022 0.011 0.009 0.010 0.015 0.016 0.007 0.011 0.011 0.011 0.014 0.012 0.012 0.014 0,025 - sediment content,% 0.02 out out out out 0.002 out out out out 0.003 out out out 0.005 8. Resistance to oxidation at 180 ° C, determined by the amount of absorbed oxygen,% vol. 12.0 3.0 2,8 2.9 3.2 3.4 2.6 2.95 3.0 2.93 20,0 10.0 11.0 12.0 24.0

Claims (1)

An insulating oil containing petroleum oil, a polymer, an antioxidant additive of phenolic and / or amine type, characterized in that it additionally contains alkyl phosphates and / or trialkyl phenyl phosphites, and the polymer used is hydrogenated poly-alpha-olefins of molecular weight 400-1000 in the following ratio of components, wt.%: Hydrogenated polyalphaolefins, m.m. 400-1000 0.1-99.7 Phenolic Antioxidant Additive and / or amine type 0.1-1.0 Alkyl phosphates and / or trialkyl phenyl phosphites 0.1-2.0 Petroleum oil up to 100