CN111676087B - Nano titanium dioxide modified transformer oil and preparation method thereof - Google Patents

Nano titanium dioxide modified transformer oil and preparation method thereof Download PDF

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Publication number
CN111676087B
CN111676087B CN202010613111.5A CN202010613111A CN111676087B CN 111676087 B CN111676087 B CN 111676087B CN 202010613111 A CN202010613111 A CN 202010613111A CN 111676087 B CN111676087 B CN 111676087B
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titanium dioxide
parts
transformer oil
modified
oil
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CN111676087A (en
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海波
张娟
黄婵
杨德浩
黄鸿翔
曲松云
鲁帅征
郝东瑞
齐超
郭杰
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Xinye Power Supply Co Of State Grid Henan Electric Power Co
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Xinye Power Supply Co Of State Grid Henan Electric Power Co
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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Abstract

The invention discloses nano titanium dioxide modified transformer oil and a preparation method thereof, wherein the modified transformer oil is prepared from the following raw materials in parts by weight: 30-40 parts of vegetable oil, 50-60 parts of mineral insulating oil, 3-8 parts of diphenyl cresyl phosphate, 2-5 parts of alkylphenol polyoxyethylene, 5-10 parts of modified nano titanium dioxide, 2-5 parts of antioxidant and 1-3 parts of metal deactivator. The raw materials are uniformly dispersed, and the heat-conducting property and the electrical property of the transformer oil are greatly improved by adding the modified nano titanium dioxide.

Description

Nano titanium dioxide modified transformer oil and preparation method thereof
Technical Field
The invention relates to the technical field of transformer oil, in particular to nano titanium dioxide modified transformer oil and a preparation method thereof.
Background
Transformer oil is widely used in today's power industry transformers as a good insulating and heat dissipating medium. In recent years, with the continuous development of ultra-high voltage and extra-high voltage transmission networks, the design requirements of transformers are developing towards large capacity, miniaturization and high insulation, and higher requirements are put forward on the strength of insulation in the transformers. Therefore, the insulating property of transformer oil is of great importance, and the nano fluid as a novel material is widely applied to the fields of industry, chemistry, energy and the like, the nano particles can not only improve the heat transfer property of the material, but also effectively improve the electrical property, the anti-aging property and the like of the dielectric medium, and the characteristics of excellent electrical property and heat dissipation property obtained by adding the nano particles into the transformer oil are receiving more and more extensive attention of researchers. The nano particles are particles with the particle size of 1-100nm, the particle size of the nano particles is smaller than that of common particles by several orders of magnitude when the nano particles are uniformly distributed in the transformer oil, and the nano particles are easy to agglomerate in a liquid dielectric medium due to the large specific surface area of the nano particles so as to influence the stability of the nano fluid. Therefore, the development of the nano transformer oil which overcomes the particle agglomeration and has stable performance is of great significance.
The Chinese patent of publication No. CN105820859B discloses a preparation method of titanium dioxide nanoparticle modified transformer oil, belonging to the technical field of power industry transformer oil production. The preparation method of the titanium dioxide nanoparticle modified transformer oil comprises the following steps. The first step is as follows: adding TiO into the mixture2Carrying out surface treatment on the nano particles to obtain TiO with a good surface coating2(ii) a The second step: modified TiO is added2Mixing the nano particles with the transformer oil by an ultrasonic or ball milling method, and finally preparing the applicable TiO by a vacuum heating treatment method2The nano particles modify the transformer oil. TiO obtained by the preparation method2The nano particle modified transformer oil has excellent heat conducting performance and electrical performance, has good long-term stability, and further ensures the stability and reliability of the transformer oil in service. However, the patent discloses sodium titanium dioxideThe rice grains are added in a small amount, and the modification effect on the transformer oil is small.
Chinese patent with publication number CN103952214B discloses a heat-conducting nano-alumina transformer oil, which comprises base oil and 0.01-0.05wt% of modified nano-alumina calculated by the base oil, wherein the base oil comprises 60-70wt% of refined vegetable oil and 30-40wt% of straight-chain alkane, and the straight-chain alkane is obtained by deeply hydrogenating the vegetable oil. The transformer oil solves the problems of poor heat conductivity and poor oxidation resistance of the transformer oil prepared from vegetable oil, and the dispersion stability of the nano material in the transformer oil is better by introducing straight-chain alkane obtained by deeply hydrogenating the vegetable oil, and the oxidation resistance of the transformer oil is further improved. However, the patent adds vegetable oil, and improves the heat dissipation performance of the transformer oil by adding nano-alumina, but the electrical performance of the obtained transformer oil is general.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the nano titanium dioxide modified transformer oil and the preparation method thereof.
In order to realize the purpose, the invention adopts the following technical scheme:
the nanometer titanium dioxide modified transformer oil is prepared from the following raw materials in parts by weight: 30-40 parts of vegetable oil, 50-60 parts of mineral insulating oil, 3-8 parts of diphenyl cresyl phosphate, 2-5 parts of alkylphenol polyoxyethylene, 5-10 parts of modified nano titanium dioxide, 2-5 parts of antioxidant and 1-3 parts of metal deactivator.
Preferably, the vegetable oil acid value is 0.01-0.03mgKOH/g, the closed flash point is 260-2/s。
Preferably, the mineral insulating oleic acid value is 0.005-0.01mgKOH/g, the closed flash point is 120-140 ℃, the breakdown voltage is 45-50kV, and the kinematic viscosity at 40 ℃ is 8-12mm2/s。
Preferably, the preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.05-0.2: 1, heating to 40-50 ℃, mixing and ball-milling for 1-3 h;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 40-60 mL: 1g, then continuously heating to 80-90 ℃, firstly mechanically stirring at a mechanical stirring speed of 1500-.
Preferably, the titanium dioxide nanoparticles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
Preferably, the antioxidant is one or more of 2, 6-tri-tert-butyl-4-methylphenol, 2, 6-di-tert-butylphenol and 2, 6-di-tert-butyl-p-cresol.
Preferably, the metal passivator is 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole or 2-methyl-benzotriazole.
The preparation method of the nano titanium dioxide modified transformer oil comprises the following steps:
(1) vacuum filtering plant oil at room temperature, heating to 80-90 deg.C, adding mineral insulating oil, and mechanically stirring at 80-100r/min for 20-30 min;
(2) ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol polyoxyethylene uniformly, wherein the ultrasonic oscillation power is 800-1200W, and the time is 10-15 min;
(3) and (2) adding the dispersion liquid obtained by the treatment in the step (2), an antioxidant and a metal passivator into the transformer oil obtained in the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 800-1200W for 10-15min, and drying in vacuum to obtain the transformer oil.
The invention has the following positive beneficial effects:
1. the invention treats the titanium dioxide nano particles by the dodecyl trimethoxy silane, the-OH groups on the surfaces of the titanium dioxide nano particles are bonded with the alkoxy of the dodecyl trimethoxy silane, the surface performance of the titanium dioxide nano particles is changed, the agglomeration of the titanium dioxide nano particles is reduced, the oleic acid is unsaturated fatty acid after further treatment by oleic acid, the oleic acid-COOH groups are esterified with the-OH groups on the surfaces of the titanium dioxide nano particles, but also polymerize under the action of dodecyl trimethoxy silane, so as to increase the compatibility with vegetable oil and mineral insulating oil, further uniformly disperse with diphenyl cresylphosphate and polyoxyethylene alkylphenol ether, the modified nano titanium dioxide can be compatible with vegetable oil and mineral insulating oil in a large amount, the viscosity of the transformer oil is reduced, the raw materials are uniformly dispersed, and the heat-conducting property and the electrical property of the transformer oil are greatly improved.
2. According to the invention, the modified nano titanium dioxide is uniformly dispersed in diphenyl cresyl phosphate and alkylphenol ethoxylates, and then added into the transformer oil, so that the dissolving amount of nano titanium dioxide particles in the transformer oil can be increased, the viscosity of the transformer oil is reduced, the uniform dispersion of all raw materials is ensured, and the obtained transformer oil has excellent thermal conductivity and electrical performance.
Detailed Description
The invention will be further illustrated with reference to some specific embodiments.
Example 1
The nanometer titanium dioxide modified transformer oil is prepared from the following raw materials in parts by weight: 30 parts of vegetable oil, 50 parts of mineral insulating oil, 3 parts of diphenyl cresyl phosphate, 2 parts of alkylphenol ethoxylates, 5 parts of modified nano titanium dioxide, 2 parts of antioxidant and 1 part of metal passivator.
The vegetable oil acid value is 0.02 mgKOH/g, the closed flash point is 265 ℃, the breakdown voltage is 80kV, the kinematic viscosity at 40 ℃ is 30mm2/s。
The mineral insulation oleic acid value is 0.01mgKOH/g, the closed flash point is 140 ℃, the breakdown voltage is 45kV, and the kinematic viscosity at 40 ℃ is 8mm2/s。
The preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.05: 1, heating to 45 ℃, mixing and ball-milling for 2 hours;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 50 mL: 1g, then continuously heating to 85 ℃, firstly mechanically stirring at the rotating speed of 1500r/min for 30min, then ultrasonically oscillating at the ultrasonic oscillating power of 1000W for 20min, finally washing with ethanol, filtering and drying to obtain the modified nano titanium dioxide.
The titanium dioxide nano particles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
The antioxidant is 2, 6-tri-tert-butyl-4-methylphenol.
The metal passivator is 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole.
The preparation method of the nano titanium dioxide modified transformer oil comprises the following steps:
(1) vacuum filtering the vegetable oil chamber at the temperature, heating to 80 ℃, adding mineral insulating oil, and mechanically stirring uniformly at a mechanical stirring speed of 90r/min for 20 min;
(2) uniformly ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol ethoxylates with the ultrasonic oscillation power of 1000W for 15 min;
(3) and (3) adding the dispersion liquid obtained by the step (2), an antioxidant and a metal passivator into the transformer oil obtained in the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 800W for 15min, and drying in vacuum to obtain the transformer oil.
Example 2
The nanometer titanium dioxide modified transformer oil is prepared from the following raw materials in parts by weight: 33 parts of vegetable oil, 54 parts of mineral insulating oil, 4 parts of diphenyl cresyl phosphate, 3 parts of alkylphenol ethoxylates, 6 parts of modified nano titanium dioxide, 2 parts of antioxidant and 1.5 parts of metal passivator.
The vegetable oil acid value is 0.015mgKOH/g, the closed flash point is 260 ℃, the breakdown voltage is 75kV, and the kinematic viscosity is 25mm at 40 DEG C2/s。
The mineral insulation oleic acid value is 0.008mgKOH/g, the closed flash point is 130 ℃, the breakdown voltage is 50kV, and the kinematic viscosity at 40 ℃ is 10mm2/s。
The preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.06: 1, heating to 48 ℃, mixing and ball-milling for 1 h;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 50 mL: 1g, continuously heating to 80 ℃, firstly mechanically stirring at a mechanical stirring speed of 1600r/min for 40min, then ultrasonically oscillating at an ultrasonic oscillation power of 800W for 25min, finally washing with ethanol, filtering and drying to obtain the modified nano titanium dioxide.
The titanium dioxide nano particles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
The antioxidant is 2, 6-di-tert-butylphenol.
The metal passivator is 2-methyl-benzotriazole.
The preparation method of the nano titanium dioxide modified transformer oil comprises the following steps:
(1) vacuum filtering the vegetable oil chamber at the temperature, heating to 85 deg.C, adding mineral insulating oil, and mechanically stirring at 80r/min for 30 min;
(2) uniformly ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol ethoxylates with the ultrasonic oscillation power of 800W for 12 min;
(3) and (3) adding the dispersion liquid obtained by the step (2), an antioxidant and a metal passivator into the transformer oil obtained by the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 1200W for 10min, and drying in vacuum to obtain the transformer oil.
Example 3
The nanometer titanium dioxide modified transformer oil is prepared from the following raw materials in parts by weight: 35 parts of vegetable oil, 56 parts of mineral insulating oil, 5 parts of diphenyl cresyl phosphate, 3 parts of alkylphenol ethoxylates, 8 parts of modified nano titanium dioxide, 3 parts of antioxidant and 2 parts of metal passivator.
The vegetable oil acid value is 0.02 mgKOH/g, the closed flash point is 265 ℃, the breakdown voltage is 80kV, the kinematic viscosity at 40 ℃ is 30mm2/s。
The mineral insulation oleic acid value is 0.01mgKOH/g, the closed flash point is 140 ℃, the breakdown voltage is 45kV, and the kinematic viscosity at 40 ℃ is 8mm2/s。
The preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.1: 1, heating to 46 ℃, mixing and ball-milling for 2 hours;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 50 mL: 1g, continuously heating to 80 ℃, firstly mechanically stirring at a mechanical stirring speed of 1600r/min for 40min, then ultrasonically oscillating at an ultrasonic oscillation power of 1000W for 20min, finally washing with ethanol, filtering and drying to obtain the modified nano titanium dioxide.
The titanium dioxide nano particles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
The antioxidant is 2, 6-di-tert-butyl-p-cresol.
The metal passivator is 2-methyl-benzotriazole.
The preparation method of the nano titanium dioxide modified transformer oil comprises the following steps:
(1) vacuum filtering the vegetable oil chamber at the temperature, heating to 80 ℃, adding mineral insulating oil, and mechanically stirring uniformly at a mechanical stirring speed of 90r/min for 20 min;
(2) ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol polyoxyethylene uniformly, wherein the ultrasonic oscillation power is 1000W, and the time is 15 min;
(3) and (3) adding the dispersion liquid obtained by the step (2), an antioxidant and a metal passivator into the transformer oil obtained by the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 1000W for 15min, and drying in vacuum to obtain the transformer oil.
Example 4
The nanometer titanium dioxide modified transformer oil is prepared from the following raw materials in parts by weight: 36 parts of vegetable oil, 58 parts of mineral insulating oil, 6 parts of diphenyl cresyl phosphate, 3.5 parts of alkylphenol ethoxylates, 8.5 parts of modified nano titanium dioxide, 3 parts of antioxidant and 2 parts of metal passivator.
The vegetable oil acid value is 0.02 mgKOH/g, the closed flash point is 270 ℃, the breakdown voltage is 70kV, and the kinematic viscosity at 40 ℃ is 35mm2/s。
The mineral insulation oleic acid value is 0.005mgKOH/g, the closed flash point is 140 ℃, the breakdown voltage is 50kV, and the kinematic viscosity at 40 ℃ is 8mm2/s。
The preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.15: 1, heating to 49 ℃, mixing and ball-milling for 3 hours;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 40 mL: 1g, then continuously heating to 85 ℃, firstly mechanically stirring at a mechanical stirring speed of 1700r/min for 40min, then ultrasonically oscillating at an ultrasonic oscillation power of 1200W for 25min, finally washing with ethanol, filtering and drying to obtain the modified nano titanium dioxide.
The titanium dioxide nano particles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
The antioxidant is 2, 6-di-tert-butylphenol.
The metal passivator is 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole.
The preparation method of the nano titanium dioxide modified transformer oil comprises the following steps:
(1) vacuum filtering the vegetable oil chamber at the temperature, heating to 90 ℃, adding mineral insulating oil, and mechanically stirring uniformly at the speed of 100r/min for 20 min;
(2) ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol polyoxyethylene uniformly, wherein the ultrasonic oscillation power is 1000W, and the time is 15 min;
(3) and (3) adding the dispersion liquid obtained by the step (2), an antioxidant and a metal passivator into the transformer oil obtained by the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 1000W for 10min, and drying in vacuum to obtain the transformer oil.
Example 5
The nanometer titanium dioxide modified transformer oil is prepared from the following raw materials in parts by weight: 38 parts of vegetable oil, 59 parts of mineral insulating oil, 7 parts of diphenyl cresyl phosphate, 4 parts of alkylphenol ethoxylates, 9 parts of modified nano titanium dioxide, 4 parts of antioxidant and 2.5 parts of metal passivator.
The vegetable oil acid value is 0.03mgKOH/g, the closed flash point is 270 ℃, the breakdown voltage is 80kV, and the kinematic viscosity at 40 ℃ is 25mm2/s。
The mineral insulation oleic acid value is 0.005mgKOH/g, the closed flash point is 120 ℃, the breakdown voltage is 45kV, and the kinematic viscosity at 40 ℃ is 12mm2/s。
The preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.17: 1, heating to 50 ℃, mixing and ball-milling for 1 h;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 60 mL: 1g, continuously heating to 90 ℃, firstly mechanically stirring at a mechanical stirring speed of 1600r/min for 30min, then ultrasonically oscillating at an ultrasonic oscillation power of 800W for 30min, finally washing with ethanol, filtering and drying to obtain the modified nano titanium dioxide.
The titanium dioxide nano particles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
The antioxidant is 2, 6-tri-tert-butyl-4-methylphenol.
The metal passivator is 2-methyl-benzotriazole.
The preparation method of the nano titanium dioxide modified transformer oil comprises the following steps:
(1) vacuum filtering the vegetable oil chamber at the temperature, heating to 85 ℃, adding mineral insulating oil, and mechanically stirring uniformly at a mechanical stirring speed of 90r/min for 30 min;
(2) ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol polyoxyethylene uniformly, wherein the ultrasonic oscillation power is 1200W, and the time is 10 min;
(3) and (3) adding the dispersion liquid obtained by the step (2), an antioxidant and a metal passivator into the transformer oil obtained in the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 800W for 15min, and drying in vacuum to obtain the transformer oil.
Example 6
The nanometer titanium dioxide modified transformer oil is prepared from the following raw materials in parts by weight: 40 parts of vegetable oil, 60 parts of mineral insulating oil, 8 parts of diphenyl cresyl phosphate, 5 parts of alkylphenol ethoxylates, 10 parts of modified nano titanium dioxide, 5 parts of antioxidant and 3 parts of metal passivator.
The vegetable oil acid value is 0.02 mgKOH/g, the closed flash point is 260 ℃, the breakdown voltage is 75kV, the kinematic viscosity at 40 ℃ is 30mm2/s。
The mineral insulation oleic acid value is 0.01mgKOH/g, the closed flash point is 130 ℃, the breakdown voltage is 50kV, and the kinematic viscosity at 40 ℃ is 10mm2/s。
The preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.2: 1, heating to 50 ℃, mixing and ball-milling for 2 hours;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 40 mL: 1g, then continuously heating to 90 ℃, firstly mechanically stirring at the rotating speed of 1500r/min for 50min, then ultrasonically oscillating at the power of 1000W for 25min, finally washing with ethanol, filtering and drying to obtain the modified nano titanium dioxide.
The titanium dioxide nano particles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
The antioxidant is 2, 6-di-tert-butyl-p-cresol.
The metal passivator is 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole.
The preparation method of the nano titanium dioxide modified transformer oil comprises the following steps:
(1) vacuum filtering the vegetable oil chamber at the temperature, heating to 90 ℃, adding mineral insulating oil, and mechanically stirring uniformly at the speed of 80r/min for 20 min;
(2) uniformly ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol ethoxylates with the ultrasonic oscillation power of 1000W for 15 min;
(3) and (3) adding the dispersion liquid obtained by the step (2), an antioxidant and a metal passivator into the transformer oil obtained by the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 1200W for 15min, and drying in vacuum to obtain the transformer oil.
The modified transformer oils obtained in examples 1 to 6 of the present invention were subjected to performance tests, and the results are shown in table 1.
TABLE 1 Property parameters of modified Transformer oils prepared in inventive examples 1-6
Figure DEST_PATH_IMAGE001
As can be seen from Table 1, the modified transformer obtained by the invention has an oleic acid value of 0.011-0.017 mgKOH/g and a low acid value; the flash point is 237-The consumption factor is small, and the electrical performance is excellent; kinematic viscosity of 10.1-12.1mm2And/s, small viscosity and good heat conductivity.

Claims (4)

1. The nanometer titanium dioxide modified transformer oil is characterized by being prepared from the following raw materials in parts by weight: 30-40 parts of vegetable oil, 50-60 parts of mineral insulating oil, 3-8 parts of diphenyl cresyl phosphate, 2-5 parts of alkylphenol polyoxyethylene, 5-10 parts of modified nano titanium dioxide, 2-5 parts of antioxidant and 1-3 parts of metal passivator;
the vegetable oil acid value is 0.01-0.03mgKOH/g, the closed flash point is 260-2/s；
The mineral insulating oleic acid value is 0.005-0.01mgKOH/g, the closed flash point is 120-2/s；
The preparation method of the modified nano titanium dioxide comprises the following steps:
(1) putting titanium dioxide nano particles into a ball mill, adding dodecyl trimethoxy silane, wherein the mass ratio of the dodecyl trimethoxy silane to the titanium dioxide nano particles is 0.05-0.2: 1, heating to 40-50 ℃, mixing and ball-milling for 1-3 h;
(2) adding oleic acid into the mixture obtained by the treatment in the step (1), wherein the dosage ratio of the oleic acid to the titanium dioxide nano particles is 40-60 mL: 1g, then continuously heating to 80-90 ℃, firstly mechanically stirring at a mechanical stirring speed of 1500-;
the titanium dioxide nano particles are gold red phase titanium dioxide, and the particle size is 10-100 nm.
2. The nano titanium dioxide modified transformer oil according to claim 1, wherein the antioxidant is one or more of 2, 6-tri-tert-butyl-4-methylphenol, 2, 6-di-tert-butylphenol and 2, 6-di-tert-butyl-p-cresol.
3. The nano titanium dioxide modified transformer oil according to claim 1, wherein the metal deactivator is 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole or 2-methyl-benzotriazole.
4. The preparation method of the nano titanium dioxide modified transformer oil as claimed in any one of claims 1 to 3, characterized by comprising the following steps:
(1) vacuum filtering the vegetable oil chamber at the temperature, heating to 80-90 deg.C, adding mineral insulating oil, and mechanically stirring at 80-100r/min for 20-30 min;
(2) ultrasonically oscillating the modified nano titanium dioxide, diphenyl cresylphosphate and alkylphenol polyoxyethylene uniformly, wherein the ultrasonic oscillation power is 800-1200W, and the time is 10-15 min;
(3) and (2) adding the dispersion liquid obtained by the treatment in the step (2), an antioxidant and a metal passivator into the transformer oil obtained in the step (1), uniformly oscillating by ultrasonic with the ultrasonic oscillation power of 800-1200W for 10-15min, and drying in vacuum to obtain the transformer oil.
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