Maleic anhydride modified voltage stabilizer and preparation method and application thereof

A technology of maleic anhydride and voltage stabilization, which is applied in the field of maleic anhydride modified voltage stabilizer and its preparation, can solve the problems of increasing the performance of electric-resistant dendrites, reducing the resistivity, and increasing the dielectric loss tangent value, etc., to achieve increased High resistance to electric properties, prolonging the working life and improving the effect of insulation resistivity

Active Publication Date: 2021-12-24
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the voltage stabilizers provided by the prior art are usually small molecule additives containing benzene rings and have a certain polarity. Within the range of effective addition of such voltage stabilizers in the prior art, they will cause dielectric loss of insulating materials. As the tangent value of the angle increases, the resistivity decreases. As an insulating material for AC cables, the tangent value of the dielectric loss angle at 50Hz must be limited within the range specified by the standard, and the smaller the value, the better the transmission capacity and working performance of the AC cable. performance
[0005] At present, relying on the existing technology, it is difficult to increase the resistance to dendrite performance without increasing the loss of the insulating material by adding a voltage stabilizer, that is, it is difficult to solve the contradiction between the resistance to resistance and the dielectric loss performance

Method used

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  • Maleic anhydride modified voltage stabilizer and preparation method and application thereof
  • Maleic anhydride modified voltage stabilizer and preparation method and application thereof
  • Maleic anhydride modified voltage stabilizer and preparation method and application thereof

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Embodiment 1

[0037] In the first aspect, this embodiment provides a maleic anhydride modified voltage stabilizer, the structural formula of which is shown in formula 1:

[0038]

[0039] In a second aspect, this embodiment provides a method for preparing a maleic anhydride-modified voltage stabilizer, comprising the following steps:

[0040] (1) dissolving maleic anhydride and 2,4-dihydroxybenzophenone in tetrahydrofuran to obtain a mixture;

[0041] (2) Under nitrogen atmosphere, add concentrated sulfuric acid to the mixture obtained in step (1), stir for 10 hours after stirring, stir at 70°C, add water and centrifuge, and dry the obtained precipitate at 80°C to obtain the Maleic anhydride modified voltage stabilizer;

[0042] Wherein, the molar ratio of dihydroxybenzophenone: maleic anhydride: tetrahydrofuran: catalyst (concentrated sulfuric acid) is 2:1.4:24:0.1.

[0043] figure 1 It is the infrared absorption spectrum of the maleic anhydride modified voltage stabilizer. From fi...

Embodiment 2

[0046] In the first aspect, this embodiment provides a maleic anhydride modified voltage stabilizer, the structural formula of which is shown in formula 1:

[0047]

[0048] In a second aspect, this embodiment provides a method for preparing a maleic anhydride-modified voltage stabilizer, comprising the following steps:

[0049] (1) dissolving maleic anhydride and 2,4-dihydroxybenzophenone in tetrahydrofuran to obtain a mixture;

[0050] (2) Under a nitrogen atmosphere, add concentrated sulfuric acid to the mixture obtained in step (1), after stirring, the stirring time is 6 hours, the stirring temperature is 68°C, add water and centrifuge, and the obtained precipitate is dried at 80°C to obtain the obtained Described maleic anhydride modified voltage stabilizer;

[0051] Wherein, the molar ratio of dihydroxybenzophenone: maleic anhydride: tetrahydrofuran: catalyst (concentrated sulfuric acid) is 2:1.7:60:0.5.

Embodiment 3

[0053] In the first aspect, this embodiment provides a maleic anhydride modified voltage stabilizer, the structural formula of which is shown in formula 1:

[0054]

[0055] In a second aspect, this embodiment provides a method for preparing a maleic anhydride-modified voltage stabilizer, comprising the following steps:

[0056] (1) dissolving maleic anhydride and 2,4-dihydroxybenzophenone in tetrahydrofuran to obtain a mixture;

[0057] (2) Under nitrogen atmosphere, add p-benzenesulfonic acid to the mixture obtained in step (1), after stirring, the stirring time is 12 hours, the stirring temperature is 65°C, add water and centrifuge, and the obtained precipitate is dried at 80°C, namely Obtain the maleic anhydride modified voltage stabilizer;

[0058] Wherein, the molar ratio of maleic dihydroxybenzophenone: maleic anhydride: tetrahydrofuran: catalyst (p-benzenesulfonic acid) is 2:2:125:1.2.

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Abstract

The invention discloses a maleic anhydride modified voltage stabilizer and a preparation method and application thereof, and belongs to the technical field of high voltage and insulation. The invention discloses a maleic anhydride modified voltage stabilizer as shown in a formula 1 and a preparation method thereof, and the preparation method comprises the following steps: (1) dissolving maleic anhydride and 2, 4-dihydroxybenzophenone in tetrahydrofuran to obtain a mixture; and (2) in a protective gas atmosphere, adding a catalyst into the mixture obtained in the step (1), stirring, adding water, centrifuging, and drying the obtained precipitate to obtain the maleic anhydride modified voltage stabilizer. The invention also provides an application of the maleic anhydride modified voltage stabilizer in a crosslinked polyethylene insulating material of a high-voltage alternating-current cable.

Description

technical field [0001] The invention relates to a maleic anhydride modified voltage stabilizer, a preparation method and application thereof, and belongs to the technical field of high voltage and insulation. Background technique [0002] XLPE insulating material has many advantages and is currently the most important insulating material for power cables. XLPE insulated power cables have a tendency to replace other cables at various voltage levels. However, it is inevitable that impurities will be introduced during the manufacturing process of XLPE insulating materials. The content and size of impurities will seriously affect the working life and operation stability of cables made of insulating materials. When cross-linked polyethylene insulating material works under high AC field strength, it is easy to generate electric tree branches due to impurities, and cause the cable insulation layer to break down rapidly and early. In most cases, the insulation layer breakdown caused...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/60C07C67/08C08K5/134C08L23/06
CPCC07C69/60C07C67/08C08K5/134C08L2207/066C08L2203/202C08L23/06Y02P20/52
Inventor 侯帅傅明利黎小林朱闻博惠宝军冯宾张逸凡展云鹏陈潇章彬徐曙伍国兴
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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