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Corona resistant composition and preparation method thereof

A technology of corona resistance and composition, applied in the direction of plastic/resin/wax insulators, organic insulators, etc., can solve the problems of easy agglomeration, limit the corona resistance performance of corona resistant compositions, and achieve uniform distribution and good mechanical properties. performance, the effect of good corona resistance

Inactive Publication Date: 2012-11-21
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although this prior art adds ceramic oxide in the polymer matrix, has improved the anti-corona performance of anti-corona composition, but because the specific surface area and surface energy of the added ceramic oxide particle are big, and ceramic oxide particle There is a strong interaction between them, which is easy to agglomerate; although organo-siloxane or organo-metalloxane is added, it is still difficult to make the ceramic oxide fully dispersed in the polymer, thus limiting The corona resistance performance of the corona resistant composition

Method used

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  • Corona resistant composition and preparation method thereof
  • Corona resistant composition and preparation method thereof
  • Corona resistant composition and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] This example is used to illustrate the corona-resistant composition provided by the present invention and its preparation method.

[0042] Weigh 20g of nano-alumina particles with an average particle size of 80nm, 0.6g of γ-aminopropyltriethoxysilane coupling agent, 0.2g of polyester-modified acrylate block copolymer dispersant, and 800mL of solvent N, N-dimethylacetamide, put into the double-layer glass reactor (RAT, Wuxi Shenke Instrument Factory), under the condition that the rotating speed is 1000r / min, stir for 1h to obtain the nano-alumina slurry, weigh 71.60g of 4,4'-diaminodiphenyl ether was added to the nano-alumina slurry, and after stirring and dissolving, 78.47g of pyromellitic dianhydride was weighed and added to the nano-alumina slurry. , reacted for 4 hours to obtain nano-alumina / polyamic acid composite slurry, filtered the composite slurry, degassed for 2 hours at 25 ° C, vacuum degree of 0.01 MPa, and then kept at 100 ° C for 1 hour. Keep at 200°C for ...

Embodiment 2

[0044] This example is used to illustrate the corona-resistant composition provided by the present invention and its preparation method.

[0045] Weigh 20g of nano-alumina particles with an average particle size of 100nm, 0.6g of γ-mercaptan aminopropyl trimethoxysilane coupling agent, 0.2g of polyester-modified acrylate block copolymer dispersant, and 800mL The solvent N,N-dimethylformamide was put into a double-layer glass reaction kettle (RAT, Wuxi Shenke Instrument Factory), and stirred for 1h under the condition of a rotating speed of 1400r / min to obtain a nano-alumina slurry, which was called Take 78.76g of 4,4'-diaminodiphenyl ether and add it to the slurry, stir and dissolve, weigh 86.32g of 4,4'-biphenyltetracarboxylic dianhydride, and add it to the nano-alumina slurry , at room temperature, react for 4 hours to obtain nano-alumina / polyamic acid composite slurry, filter the composite slurry, degas the vacuum at 30 ° C for 3 hours at a vacuum degree of 0.01 MPa, and th...

Embodiment 3

[0047] This example is used to illustrate the corona-resistant composition provided by the present invention and its preparation method.

[0048] Weigh 15g of nano-alumina particles with an average particle size of 50nm, 0.5g of γ-mercaptan aminopropyl trimethoxysilane coupling agent, 0.1g of polyester-modified acrylate block copolymer dispersant, and 600mL The solvent N,N-dimethylformamide was put into a double-layer glass reaction kettle (RAT, Wuxi Shenke Instrument Factory), and the rotation speed was 120r / min, and stirred for 2h to obtain a nano-alumina slurry, which was called Take 53.7g of 4,4'-diaminodiphenyl ether and add it to the slurry, stir and dissolve, weigh 58.85g of 3,3',4,4'-benzophenone tetracarboxylic dianhydride, add Into the nano-alumina slurry, react for 4 hours at 40°C to obtain a nano-alumina / polyamic acid composite slurry, filter the composite slurry, and vacuum degas at 25°C and a vacuum of 0.01 MPa for 2 hours Hours, then kept at 100°C for 1 hour, 2...

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Abstract

The invention provides a corona resistant composition and a preparation method thereof. The corona resistant composition comprises polyimide and nano alumina granules; and based on the total weight of the corona resistant composition, the polyimide accounts for 70 to 95 percent, the nano alumina granules account for 5 to 30 percent, a silane coupling agent accounts for 0.01 to 0.3 percent, and a polyester modified acrylate block copolymer dispersant accounts for 0.005 to 0.3 percent. The prepared corona resistant composition has excellent corona resistance; and under the condition that the thickness of the corona resistant composition is 22 to 28 microns, the corona resistant time of the corona resistant composition is more than one hundred thousand hours.

Description

technical field [0001] The invention relates to a corona-resistant composition and a preparation method thereof, in particular to a corona-resistant composition containing polyimide and nano-alumina particles and a preparation method thereof. Background technique [0002] In recent years, due to the advantages of high efficiency, energy saving, and convenient use, variable frequency speed regulation motors have been rapidly promoted and gradually replaced mechanical variable speed and DC speed regulation motors. However, the pulse wave provided by the frequency conversion speed control device has towering peaks, steep rise time, variable or extremely high frequency, sometimes up to 20KHz, and the pulse voltage is extremely unevenly distributed on the winding, making the primary The inter-turn voltage of the winding near the end of the winding is dozens of times higher than the average distribution voltage, resulting in partial discharge between the winding turns, and the ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08K9/06C08K3/22C08G73/10H01B3/30
Inventor 伍伯林马凤山
Owner BYD CO LTD
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