By using nano TiO2Preparation of charge accumulation resistant insulating oil from modified sunflower seed oil
阅读说明：本技术 一种利用纳米TiO2改性葵花籽油制备抗电荷积聚绝缘油 (By using nano TiO2Preparation of charge accumulation resistant insulating oil from modified sunflower seed oil ) 是由 刘捷丰 张镱议 邢中玉 李毅 范贤浩 于 2021-06-29 设计创作，主要内容包括：本发明公开了一种利用纳米TiO-(2)改性葵花籽油制备抗电荷积聚绝缘油,是将葵花籽绝缘油经过真空干燥,加热至40-60℃,搅拌30-60min,往葵花籽绝缘油中加入其质量1-4%的改性纳米TiO-(2),超声振荡均匀,获得改性葵花籽油；所述改性纳米TiO-(2)的制备方法如下：将纳米TiO-(2)颗粒放入研磨机充分研磨,再加入无水乙醇混合,再往混合液中加入油酸、丙烯酸松香聚氧乙烯蔗糖酯和聚乙二醇组成的改性剂进行表面改性,乙醇洗涤。干燥,即得改性纳米TiO-(2)。本发明方法采用纳米二氧化钛(TiO-(2))粒子改性葵花籽绝缘油,使葵花籽绝缘油的抗电荷积聚能力提高,使其在保证其电气绝缘性能的前提下使电荷易消散、难积聚,减少了由电荷积聚引起的电场畸变程度,使变压器运行更加安全。(The invention discloses a method for preparing a nano TiO film 2 The modified sunflower seed oil is prepared by vacuum drying sunflower seed insulating oil, heating to 40-60 deg.C, stirring for 30-60min, and adding 1-4 wt% of modified nanometer TiO into sunflower seed insulating oil 2 Uniformly oscillating by ultrasonic to obtain modified sunflower seed oil; the modified nano TiO 2 The preparation method comprises the following steps: mixing nanometer TiO 2 Grinding the granules in a grinder, adding absolute ethyl alcohol, mixing, adding a modifier consisting of oleic acid, acrylic rosin polyoxyethylene sucrose ester and polyethylene glycol into the mixed solution for surface modification, and washing with ethyl alcohol. Drying to obtain modified sodiumTiO rice 2 . The method adopts nano titanium dioxide (TiO) 2 ) The sunflower seed insulating oil is modified by the particles, so that the charge accumulation resistance of the sunflower seed insulating oil is improved, the charges are easy to dissipate and difficult to accumulate on the premise of ensuring the electrical insulating property of the sunflower seed insulating oil, the electric field distortion degree caused by charge accumulation is reduced, and the transformer is safer to operate.)
1. A kind ofUsing nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the method comprises the following steps: vacuum drying sunflower seed insulating oil, heating to 40-60 deg.C, stirring for 30-60min, and adding 1-4 wt% of modified nanometer TiO into the sunflower seed insulating oil2Uniformly oscillating by ultrasonic to obtain modified sunflower seed oil;
the preparation method of the modified nano TiO2 comprises the following steps: mixing nanometer TiO2Grinding the granules in a grinder, adding absolute ethanol, mixing, adding a modifier consisting of oleic acid, acrylic rosin polyoxyethylene sucrose ester and polyethylene glycol into the mixed solution for surface modification, washing with ethanol, and drying to obtain the modified nano TiO2。
2. The method of claim 1 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the addition of the modifier is nano TiO23-10% of the mass.
3. The method of claim 2 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the mass ratio of oleic acid to acrylic rosin polyoxyethylene sucrose ester to polyethylene glycol in the modifier is 3-5:1-3: 1-3.
4. The method of claim 1 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the stirring is carried out for 30-60min at the rotating speed of 50-150 r/min.
5. The method of claim 1 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the modified nano TiO2And the sunflower seed insulating oil is subjected to ultrasonic oscillation for 30-60min under 1000-1500W.
6. The method of claim 1 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that:the grinding is carried out for 2-3h at the rotating speed of 300-500 r/min.
7. The method of claim 1 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the nano TiO2The particle size of (A) is 10-50 nm.
8. The method of claim 1 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the modified nano TiO2The drying is carried out under pressure of 50-60Pa and at temperature of 60-80 deg.C.
9. The method of claim 1 using nano TiO2Modified sunflower seed oil is used for preparing insulating oil for resisting charge accumulation, and is characterized in that: the absolute ethyl alcohol and the nano TiO2The mass ratio of the particles is 1: 20-50.
Technical Field
The invention relates to the technical field of electric power insulation, in particular to a method for preparing a nano TiO material2Modified sunflower seed oil is used in preparing insulating oil for resisting charge accumulation.
Background
The electric power system provides important energy for various industries, and plays an indispensable important role in the current social and economic development of China and the life of people. As a key device in a power system, an oil-immersed transformer is subjected to failure, which may cause an accident such as power failure. Therefore, it is important to ensure safe and reliable operation of the transformer.
The oil-immersed transformer is a key device of a power system, and the failure of the oil-immersed transformer can cause power failure and great economic loss. The insulation performance of oil-filled transformers is mainly determined by the internal insulation consisting of insulating oil and insulating paper. During long-term operation of the oil paper insulation system, space charges accumulated inside a medium of the oil paper insulation system can directly cause distortion of local electric field distribution, and when the electric field distortion is serious, the oil paper insulation can be broken down. Therefore, avoiding charge accumulation is critical to ensure proper operation of the paper oil insulation system.
In recent years, sunflower seed insulating oil is used as transformer insulating oil due to the advantages of breakdown resistance, high ignition point, environmental protection and the like, but the characteristic of space charge accumulation of the sunflower seed insulating oil cannot ensure the safe operation of insulating oil paper, so that the wide application of the sunflower seed insulating oil is limited. The development of the sunflower seed insulating oil capable of resisting charge accumulation has important significance for ensuring the safe operation of an oil paper insulating system.
With the development of nanotechnology, modifying various properties of insulating oil by using nanoparticles has become a research hotspot in recent years. Nano titanium dioxide (TiO)2) Because of the advantages of larger specific surface area, good dispersibility, strong weather resistance and the like, the invention takes the nano titanium dioxide as the modification of the sunflower seedsParticle to overcome the defects of sunflower seed insulating oil.
Disclosure of Invention
Aiming at the defects of sunflower seed insulating oil, the invention provides a method for preparing a sunflower seed insulating oil by using nano TiO2Modified sunflower seed oil is used in preparing insulating oil for resisting charge accumulation. The modified sunflower seed oil insulating oil provided by the invention can improve the charge dissipation capacity of the sunflower seed oil insulating oil, weaken the distortion effect of charge accumulation on an electric field, enable an insulating oil system to be capable of stably operating for a long time, enable a transformer to operate more safely and reliably, and prolong the service life of the transformer.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
by using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps: vacuum drying sunflower seed insulating oil, heating to 40-60 deg.C, stirring for 30-60min, and adding 1-4 wt% of modified nanometer TiO into the sunflower seed insulating oil2Uniformly oscillating by ultrasonic to obtain modified sunflower seed oil;
the modified nano TiO2The preparation method comprises the following steps: mixing nanometer TiO2Grinding the granules in a grinder, adding absolute ethanol, mixing, adding a modifier consisting of oleic acid, acrylic rosin polyoxyethylene sucrose ester and polyethylene glycol into the mixed solution for surface modification, washing with ethanol, and drying to obtain the modified nano TiO2。
The method of the invention has the further optimization scheme that: the addition of the modifier is nano TiO23-10% of the mass.
The method of the invention has the further optimization scheme that: the mass ratio of oleic acid to acrylic rosin polyoxyethylene sucrose ester to polyethylene glycol in the modifier is 3-5:1-3: 1-3.
The method of the invention has the further optimization scheme that: the stirring is carried out for 30-60min at the rotating speed of 50-150 r/min.
The method of the invention has the further optimization scheme that: the modified nano TiO2And the sunflower seed insulating oil is subjected to ultrasonic oscillation for 30-60min under 1000-1500W.
The method of the invention has the further optimization scheme that: the grinding is carried out for 2-3h at the rotating speed of 300-500 r/min.
The method of the invention has the further optimization scheme that: the nano TiO2The particle size of (A) is 10-50 nm.
The method of the invention has the further optimization scheme that: the modified nano TiO2The drying is carried out under pressure of 50-60Pa and at temperature of 60-80 deg.C.
The method of the invention has the further optimization scheme that: the absolute ethyl alcohol and the nano TiO2The mass ratio of the particles is 1: 20-50.
The method of the invention has the further optimization scheme that: the acid value of the sunflower seed insulating oil is 0.01-0.04mgKOH/g, the closed flash point is 270-290 ℃, and the breakdown voltage is 70-80 kV.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the method adopts nano titanium dioxide (TiO)2) The sunflower seed insulating oil is modified by the particles, so that the charge accumulation resistance of the sunflower seed insulating oil is improved, the charges are easy to dissipate and difficult to accumulate on the premise of ensuring the electrical insulating property of the sunflower seed insulating oil, the electric field distortion degree caused by charge accumulation is reduced, and the transformer is safer to operate.
2. The method of the invention uses oleic acid, acrylic acid rosin polyoxyethylene sucrose ester and polyethylene glycol as nano titanium dioxide (TiO)2) The modifier not only can solve the problem that the nano particles are easy to agglomerate, but also can improve the compatibility between the nano particles and cellulose and improve the charge accumulation resistance of the sunflower seed insulating oil.
Detailed Description
The following embodiments are provided to clearly and completely describe the technical solutions of the present invention, but not to limit the scope of the present invention.
Example 1
By using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps:
(1) preparation of modified nano TiO2: 5g of TiO are weighed2Grinding the nano-particles in a grinder at a rotation speed of 300r/min for 3h, and then adding the nano-TiO2Adding the mixture into 200ml of absolute ethyl alcohol for mixing, and adding a modifier consisting of oleic acid, acrylic rosin polyoxyethylene sucrose ester and polyethylene glycol in a mass ratio of 3:1:1 into the mixed solution for surface modification, wherein the addition amount of the modifier is TiO28 percent of the modified nano TiO, washing with ethanol, and fully drying under the pressure of 50Pa and the temperature of 60 ℃ to obtain the modified nano TiO2。
(2)TiO2Modified sunflower seed oil: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 45 deg.C, stirring at 100r/min for 30min, and adding the modified nanometer TiO into the sunflower seed insulating oil2And performing ultrasonic oscillation for 30min under the power of 1500W to obtain the modified sunflower seed oil.
Example 2
By using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps:
(1) preparation of modified nano TiO2: 10g of TiO are weighed2Grinding the nano-particles in a grinder at a rotation speed of 500r/min for 2h, and then adding the nano-TiO2Adding the mixture into 200ml of absolute ethyl alcohol for mixing, and adding a modifier consisting of oleic acid, acrylic rosin polyoxyethylene sucrose ester and polyethylene glycol in a mass ratio of 4:2:1 into the mixed solution for surface modification, wherein the addition amount of the modifier is TiO2Washing with ethanol, and drying at 50Pa and 60 deg.C to obtain modified nanometer TiO2。
(2)TiO2Modified sunflower seed oil: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 50 deg.C, stirring at 50r/min for 60min, and adding the modified nanometer TiO into the sunflower seed insulating oil2And carrying out ultrasonic oscillation for 45min under the power of 1000W to obtain the modified sunflower seed oil.
Example 3
By using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps:
(1) preparation of modified nano TiO2: balanceTaking 15g of TiO2Grinding the nano-particles in a grinder at a rotation speed of 400r/min for 2.5h, and then adding the nano-TiO2Adding the mixture into 200ml of absolute ethyl alcohol for mixing, and adding a modifier consisting of oleic acid, acrylic rosin polyoxyethylene sucrose ester and polyethylene glycol in a mass ratio of 3:2:1 into the mixed solution for surface modification, wherein the addition amount of the modifier is TiO2Washing with ethanol, and drying at 60Pa and 70 deg.C to obtain modified nanometer TiO2。
(2)TiO2Modified sunflower seed oil: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 55 deg.C, stirring at 150r/min for 30min, and adding the modified nanometer TiO into the sunflower seed insulating oil2And carrying out ultrasonic oscillation for 30min under the power of 1200W to obtain the modified sunflower seed oil.
Example 4
By using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps:
(1) preparation of modified nano TiO2:20 g of TiO are weighed2Grinding the nano-particles in a grinder at the rotation speed of 350r/min for 3h, and then grinding the nano-TiO2Adding the mixture into 200ml of absolute ethyl alcohol for mixing, and adding a modifier consisting of oleic acid, acrylic rosin polyoxyethylene sucrose ester and polyethylene glycol in a mass ratio of 3:1:1 into the mixed solution for surface modification, wherein the addition amount of the modifier is TiO25 percent of the modified nano TiO, washing with ethanol, and fully drying under the pressure of 60Pa and the temperature of 60 ℃ to obtain the modified nano TiO2。
(2)TiO2Modified sunflower seed oil: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 50 deg.C, stirring at 100r/min for 30min, and adding the modified nanometer TiO into the sunflower seed insulating oil2And carrying out ultrasonic oscillation for 45min under the power of 1000W to obtain the modified sunflower seed oil.
Comparative example 1
TiO2The method for modifying the sunflower seed oil comprises the following steps: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 50 deg.C, stirring at 50r/min for 60min, and mixing10g of nano TiO is added into sunflower seed insulating oil2(TiO2The nano particles are firstly put into a grinder and ground for 3h at the rotating speed of 350 r/min), and the modified sunflower seed oil is obtained by ultrasonic oscillation for 45min at the power of 1000W.
Comparative example 2
By using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps:
(1) preparation of modified nano TiO2: 10g of TiO are weighed2Grinding the nano-particles in a grinder at a rotation speed of 500r/min for 2h, and then adding the nano-TiO2Adding into 200ml absolute ethyl alcohol, mixing, adding into TiO2Oleic acid with the mass of 7% is used for surface modification, and the addition amount of the modifying agent is TiO2Washing with ethanol, and drying at 50Pa and 60 deg.C to obtain modified nanometer TiO2。
(2)TiO2Modified sunflower seed oil: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 50 deg.C, stirring at 50r/min for 60min, and adding the modified nanometer TiO into the sunflower seed insulating oil2And carrying out ultrasonic oscillation for 45min under the power of 1000W to obtain the modified sunflower seed oil.
Comparative example 3
By using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps:
(1) preparation of modified nano TiO2: 10g of TiO are weighed2Grinding the nano-particles in a grinder at a rotation speed of 500r/min for 2h, and then adding the nano-TiO2Adding into 200ml absolute ethyl alcohol, mixing, adding into TiO2Acrylic acid rosin polyoxyethylene sucrose ester with the mass of 7 percent is subjected to surface modification, and the addition amount of the modifier is TiO2Washing with ethanol, and drying at 50Pa and 60 deg.C to obtain modified nanometer TiO2。
(2)TiO2Modified sunflower seed oil: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 50 deg.C, stirring at 50r/min for 60min, and adding into sunflower seedThe modified nano TiO is added into seed insulating oil2And carrying out ultrasonic oscillation for 45min under the power of 1000W to obtain the modified sunflower seed oil.
Comparative example 4
By using nano TiO2The preparation method of the charge accumulation resistant insulating oil from the modified sunflower seed oil comprises the following steps:
(1) preparation of modified nano TiO2: 10g of TiO are weighed2Grinding the nano-particles in a grinder at a rotation speed of 500r/min for 2h, and then adding the nano-TiO2Adding into 200ml absolute ethyl alcohol, mixing, adding into TiO2Polyethylene glycol with the mass of 7 percent is used for surface modification, and the addition amount of the modifying agent is TiO2Washing 7% polyethylene glycol with ethanol, and drying at 50Pa and 60 deg.C to obtain modified nanometer TiO2。
(2)TiO2Modified sunflower seed oil: vacuum drying 500g sunflower seed insulating oil at room temperature, heating to 50 deg.C, stirring at 50r/min for 60min, and adding the modified nanometer TiO into the sunflower seed insulating oil2And carrying out ultrasonic oscillation for 45min under the power of 1000W to obtain the modified sunflower seed oil.
The interfacial charge accumulation property and the interfacial charge dissipation property of the modified sunflower oil prepared in examples 1-4 and comparative examples 1-4 of the invention and the unmodified sunflower oil are measured, and the breakdown voltage (kV) of the insulating oil is measured after thermal aging tests of different days. The measurement results are shown in tables 1, 2 and 3. Wherein the interfacial charge accumulation property and the interfacial charge dissipation property are determined by a method in which the surface charge density (pC/mm)2). The thermal aging test comprises the following steps: and (3) placing the insulating oil sample in an aging tank, pumping out residual air in the tank, filling nitrogen, sealing, placing the aging tank filled with the oil product in an aging box at 130 ℃ for a thermal aging test, and testing the breakdown voltage (kV) of the insulating oil at different time days.
Table 1: the interface charge accumulation characteristic of the modified sunflower seed insulating oil prepared by the invention
Table 2: interface charge dissipation characteristic of modified sunflower seed insulating oil prepared by using method
Compared with unmodified sunflower seed insulating oil, the modified sunflower seed insulating oil prepared by the invention can enable charges on an oil-paper interface to be easily dissipated and difficult to accumulate.
Table 3: the breakdown voltage of the modified sunflower seed insulating oil changes with aging time
The test results show that the breakdown voltage of the modified sunflower seed insulating oil after thermal aging is obviously higher than that of unmodified sunflower seed insulating oil, and the modified sunflower seed insulating oil prepared by the method has better insulating property.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.