Special insulating material for electrical equipment and preparation method for special insulating material

A technology for insulating materials and power equipment, applied in the direction of organic insulators, plastic/resin/wax insulators, etc., can solve the problem of not improving the corrosion resistance and aging resistance of materials, unfavorable large-scale production, charge surface flashover, etc. to avoid surface flashover, optimize electric field distribution, and reduce stress cracking

Inactive Publication Date: 2016-02-24
国网河南唐河县供电公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the volume resistivity of epoxy resin insulating materials used for hanging grids is relatively low, especially under DC high voltage, the long-term accumulation of charges causes surface flashover, which is one of the biggest hidden dangers to the safety of UHV power grids
Because the uneven distribution of space charge will cause distortion of the insulating material, affect its insulation degree and accelerate the aging of the material, in addition, the domestic air pollution is serious and the weather conditions are complicated. As the number one enemy of power safety, the pollution flashover protection of power transmission and transformation equipment is still an arduous task.
[0003] Invention patent CN101445627A discloses a high-voltage DC cable insulation material and its preparation method. The technical solution adopted in the invention is to mix 100 parts by weight of low-density polyethylene, 0.1-1 parts by weight of antioxidant, 0.5-5 parts by weight of The maleic anhydride is put into the internal mixer for mixing, and then 0.1-5 parts by weight of cross-linking agent is added and mixed for 10-15 minutes to obtain high-voltage DC cable insulation materials. The insulation materials prepared by the invention can effectively improve the high-voltage The mechanical properties and electrical properties of DC cables, but this invention can not improve the corrosion resistance and aging resistance of materials
The insulating material prepared by the invention has good flexibility and excellent mechanical properties, and can effectively improve the mechanical properties and electrical properties of ultra-high voltage DC cables, but the preparation process of the invention is complicated, which is not conducive to large-scale production

Method used

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  • Special insulating material for electrical equipment and preparation method for special insulating material

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[0036] The present invention also provides a preparation method of the above-mentioned special insulating material for electric equipment, comprising the following steps:

[0037] 1) Add 0.2~1 parts by weight of butyl titanate to 20~40 parts by weight of distilled water, place in a magnetic stirrer, stir for 30~45 minutes at 25~35°C, and then add 15~20 parts by weight of nano inorganic powder , ultrasonic treatment, ultrasonic frequency 25~30kHz, power 300~500W, ultrasonic time 35~40min, filter, and then dry at 70~75°C to obtain surface-modified nano-inorganic powder;

[0038] 2) Add the surface-modified nano-inorganic powder obtained in step 1) and 90-100 parts by weight of epoxy resin to the torque rheometer in sequence, and mix at 150-175°C for 15-30 minutes to obtain modified epoxy resin resin;

[0039] 3) The modified epoxy resin obtained in step 2), 15-25 parts by weight of methyl vinyl silicone rubber, 20-25 parts by weight of fluorosilicone resin, 15-20 parts by weigh...

Embodiment 1

[0046] A special insulating material for electric power equipment, which contains components and their contents: 90 parts by weight of epoxy resin, 15 parts by weight of methyl vinyl silicone rubber, 20 parts by weight of fluorosilicone resin, and polystyrene with a particle size of 0.8 to 3.5 μm. 15 parts by weight of tetrafluoroethylene, 10 parts by weight of glass fibers with a length of 2 to 3 mm, 15 parts by weight of nano inorganic powder, 0.2 parts by weight of butyl titanate, 20 parts by weight of distilled water, maleic anhydride grafted polyethylene and maleic anhydride Grafted polypropylene is 1 weight part of compatibilizer mixed according to the ratio of 7:3 by weight, 1 weight part of aluminum hydroxide, 0.3 weight part of antioxidant 300, 1 weight part of dibenzoyl peroxide;

[0047] Among them, the nano-inorganic powder is Al with a particle size of 15-30nm 2 o 3 , nano-SiO 2 , Nano B 4 C. Nano-Si 3 N 4 and nano TiO 2 mixture of nano-Al 2 o 3 , nano-SiO...

Embodiment 2

[0055] A special insulating material for power equipment, which contains components and their contents: 91 parts by weight of epoxy resin, 16 parts by weight of methyl vinyl silicone rubber, 21 parts by weight of fluorosilicone resin, and polystyrene with a particle size of 0.8 to 3.5 μm. 16 parts by weight of tetrafluoroethylene, 11 parts by weight of glass fibers with a length of 2 to 3 mm, 16 parts by weight of nano-inorganic powder, 0.3 parts by weight of butyl titanate, 22 parts by weight of distilled water, maleic anhydride grafted polyethylene and maleic anhydride Grafted polypropylene is 2 parts by weight of compatibilizer mixed in a ratio of 7:3 by weight, 1.5 parts by weight of aluminum hydroxide, 0.4 parts by weight of antioxidant 1076, and 2 parts by weight of dicumyl peroxide;

[0056] Among them, the nano-inorganic powder is Al with a particle size of 15-30nm 2 o 3 , nano-SiO 2 , Nano B 4 C. Nano-Si 3 N 4 and nano TiO 2 mixture of nano-Al 2 o 3 , nano-SiO...

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Abstract

The invention discloses a special insulating material for electrical equipment and a preparation method for the special insulating material. The special insulating material for the electrical equipment comprises the following components in parts by weight: 90-100 parts of epoxy resin, 15-25 parts of methyl vinyl silicone rubber, 20-25 parts of fluorosilicon resin, 15-20 parts of polytetrafluoroethylene, 10-15 parts of glass fiber, 15-20 parts of nano inorganic powders, 0.2-1 part of butyl titanate, 20-40 parts of distilled water, 1-6 parts of a compatilizer, 1-5 parts of a flame retardant, 0.3-1.2 parts of an antioxidant and 1-10 parts of a crosslinking agent. The special insulating material for the electrical equipment prepared by the invention can inhibit the space charge accumulation in the cable insulating material, improve the anti-aging property, the anti-flashover property and the anti-acidic and alkaline water-resistent property of the material, has good mechanical properties, electrical property and thermal property, and is excellent in comprehensive properties.

Description

technical field [0001] The invention relates to an insulating material and a preparation method thereof, in particular to a special insulating material for electric equipment and a preparation method thereof. Background technique [0002] In recent years, my country's electric power industry has developed rapidly, the operating voltage level of the power grid system has been continuously improved, and the network scale has gradually expanded. The core equipment in the power grid is mainly epoxy resin-based materials. Epoxy resin is a medium-polar polymer with epoxy groups at the end of its macromolecules and hydroxyl and ether bonds in the middle of the bonds. During the curing process, hydroxyl and ether bonds will continue to be produced. Ether bonds, so induced charges will be generated when an external electric field is applied, resulting in a certain gap in the volume resistivity of epoxy resins compared with non-polar polymers. At present, the volume resistivity of ep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L83/07C08L83/08C08L27/18C08K13/06C08K9/04C08K3/22C08K3/36C08K3/38C08K3/34C08K7/14H01B3/40
Inventor 陈晓燕
Owner 国网河南唐河县供电公司
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