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A kind of preparation method of UHV composite insulator

A composite insulator and ultra-high voltage technology, applied in the field of preparation of ultra-high voltage composite insulators, can solve the problems of short service life, poor hydrophobicity, and reduced tensile strength, achieve excellent formability, improve aging resistance, reduce The effect of thermal degradation rate

Active Publication Date: 2021-12-21
醴陵市东方电瓷电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the silicone rubber umbrella skirt is under the action of ultraviolet radiation for many years, the silicon-carbon bond and carbon-hydrogen bond will be broken to form free radicals, and the small molecular oligomers generated by the combination of the generated free radicals will volatilize, and the macromolecular polymers will crosslink each other. The cross-linking density of silicone rubber increases, the material hardens, and the tensile strength decreases; the silicone rubber shed has been exposed to high humidity or rain for many years, forming an acidic aqueous solution environment on the surface of the insulator, and hydrogen ions attack the silicon in the main chain of silicone rubber. The oxygen bond makes it break the bond, and the group after the bond break cannot be recombined, because the small molecule at the end of the hydroxyl group is generated under acidic conditions, and the inorganic filler aluminum hydroxide in the silicone rubber can react with the acidic substance to promote the silicone rubber. At the same time, the silicone rubber molecule contains terminal hydroxyl groups. Under high voltage and high current, the terminal hydroxyl groups trigger the release of the main chain of the silicone rubber molecular chain. The loss of water property will cause electric corrosion and tracking on the surface of the insulator, resulting in poor aging resistance and short service life of the silicone rubber shed
[0004] Chinese invention patent CN201510125814.2 discloses a high-voltage electric corrosion-resistant silicone rubber composition for composite insulators and its preparation method, which improves the electrical resistance of the silicone rubber composition for composite insulators by adding heat-conducting metal oxide nanoparticles Corrosion level, and retains good mechanical properties, but its hydrophobic performance is poor, pollution flashover resistance performance is average, resulting in the insulator's general anti-aging performance and short service life
Chinese invention patent CN201510066190.1 discloses a fluorosilicone rubber for aging-resistant porcelain composite insulators and its application. It is made of fluororubber raw rubber, silicone rubber compound rubber, aluminum hydroxide powder, fumed Pentasulfur agent, polytetrafluoroethylene powder and other raw materials are prepared, which have excellent tear strength and aging resistance. However, the composite insulator contains fluorine, which has a great impact on the environment. Corrosion performance, breakdown resistance and other general electrical properties, the raw material contains aluminum hydroxide, so that after a period of use, the composite insulator's water repellency and pollution flashover resistance performance will deteriorate, which can no longer meet the needs of the growing power industry. need

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  • A kind of preparation method of UHV composite insulator

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preparation example Construction

[0030] The preparation method of the UHV composite insulator of the present invention specifically comprises the following steps:

[0031] (1) Put methyl vinyl phenyl silicone rubber raw rubber, Mg-SiC compound and hydroxyl silicone oil in a kneader, knead at 80-120°C for 0.5-1h, then mix modified diatomaceous earth, cyclo Thin trisilazane, nano-ZnO, titanium dioxide, dispersant and silane coupling agent are put into the kneader, vacuumed for vacuum kneading, the vacuum degree is 0.05-0.26MPa, the temperature is 120-160°C, and kneading for 2-3h , to obtain the mixed rubber.

[0032] (2) Wrap the mixed rubber on an open mill, add a vulcanizing agent, thin it out, and release the sheet, then place the sheet on a flat vulcanizing machine for vulcanization and molding, and vulcanize for 10 at 160-180°C under a pressure of 10-12MPa. -12min, get silicone rubber material.

[0033] (3) Put the FRP mandrel into the pressure impregnation tank, turn on the vacuum pump, vacuumize, the v...

Embodiment 1

[0039] A kind of preparation method of silicone rubber material The preparation method specifically comprises the following steps:

[0040] (1) Put 100 parts of methyl vinyl phenyl silicone rubber raw rubber, 40 parts of Mg-SiC compound and 3 parts of hydroxyl silicone oil in a kneader, knead at 80°C for 1 hour, and then mix the modified diatomite 70 parts, 7 parts of cyclic trisilazane, 5 parts of nano-ZnO, 2 parts of titanium dioxide, 1.5 parts of dispersant and 1.5 parts of silane coupling agent were put into the kneader, vacuumed for vacuum kneading, the vacuum degree was 0.05MPa, The temperature was 160°C, and the mixture was kneaded for 3 hours to obtain a mixed rubber.

[0041] (2) Wrap the mixed rubber on an open mill, add 3 parts of vulcanizing agent phenol formaldehyde resin, thin it out, and release the sheet, then place the sheet on a flat vulcanizing machine for vulcanization and molding, and vulcanize at 160°C and 12MPa pressure After 10 minutes, the silicone ru...

Embodiment 2

[0047] A kind of preparation method of silicone rubber material specifically comprises the following steps:

[0048] (1) Put 100 parts of methyl vinyl phenyl silicone rubber raw rubber, 80 parts of Mg-SiC compound and 5 parts of hydroxyl silicone oil in a kneader, knead at 120°C for 0.5h, and then mix the modified diatom Put 50 parts of soil, 4 parts of cyclic trisilazane, 8 parts of nano-ZnO, 5 parts of titanium dioxide, 3 parts of dispersant and 4 parts of silane coupling agent into the kneader, vacuumize and knead with a vacuum degree of 0.26MPa , the temperature was 120°C, and the mixture was kneaded for 2 hours to obtain a mixed rubber.

[0049] (2) Wrap the mixed rubber on an open mill, add 1 part of vulcanizing agent phenol formaldehyde resin, thin it out, and release the sheet, then put the sheet material on a flat vulcanizing machine for vulcanization molding, and vulcanize at 180°C and 10MPa pressure After 12 minutes, the silicone rubber material A2 was obtained.

...

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Abstract

The invention discloses a method for preparing an ultra-high voltage composite insulator, and relates to the technical field of composite insulators. The preparation method of the UHV composite insulator disclosed by the present invention comprises: using methyl vinyl phenyl silicone rubber raw rubber, Mg-SiC compound, modified diatomite and other raw materials to mix and vulcanize the silicone rubber material; the glass fiber reinforced plastic core The surface of the rod is modified by vacuum pressure impregnation; finally, the silicon rubber material and the fiberglass mandrel coated with adhesive are vulcanized and pressed. The preparation method of the UHV composite insulator provided by the present invention improves the bonding strength between the fiberglass core rod and the silicone rubber shed, and the silicone rubber material has excellent electrical insulation, flame retardancy, hydrophobic performance, high and low temperature resistance and Mechanical strength, and improved pollution flashover resistance and aging resistance of silicone rubber materials, not easy to damage, thereby improving the operational reliability of composite insulators and prolonging their service life.

Description

technical field [0001] The invention belongs to the technical field of composite insulators, and in particular relates to a preparation method of an ultra-high voltage composite insulator and a preparation method thereof. Background technique [0002] Composite insulators, also known as polymer insulators, are mainly composed of three parts: silicone rubber shed sheath, fiberglass core rod and end fittings. Compared with traditional ceramic insulators and glass insulators, they have extremely strong hydrophobicity and hydrophobicity. , light weight, easy to transport and install, high strength and good mechanical properties, and extremely convenient in the process of operation and maintenance, therefore, it has been widely used in the field of electric power in our country. The umbrella cover and mandrel material of the composite insulator are made of organic materials, whose intermolecular bonding is weaker than inorganic materials such as porcelain and glass, and will occu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/70B29C70/68B29C70/88C08L83/07C08L83/04C08K3/22C08K3/34C08K9/06C08K7/26C08K13/06
CPCB29C70/70B29C70/683B29C70/88C08L83/04C08L2205/025C08L2205/035C08K2201/011C08K2003/2296C08K2003/2241C08K2003/2224C08L2201/02C08L2201/08C08K3/22C08K3/34C08K9/06C08K7/26C08K13/06
Inventor 李福来
Owner 醴陵市东方电瓷电器有限公司
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