两种功能化硅氧基聚酰亚胺薄膜的高频沿面放电寿命对比研究

doi:10.19595/j.cnki.1000-6753.tces.200316

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Abstract Polyimide can be used as an insulating material for high frequency power transformers, but it is faced with the problem of insulation failure due to creeping discharge, which can be improved by material modification technology. This paper introduced 1, 3-bis (3-aminopropyl) -1, 1, 3, 3-tetramethyldisiloxane (GAPD) with 1%, 2% and 5% molar content and equivalent content of SiO₂, respectively, and modified polyimide films by molecular structure and nanocomposite to functionalize its silicon oxygen. The physical and chemical properties of materials such as ultraviolet spectrum, scanning electronic microscope (SEM) and resistivity were studied and compared. The high frequency creeping discharge life of materials was mainly tested. The results show that the basic physical and chemical properties of the polyimide modified by the two methods are excellent, such as thermal and mechanical properties. After adding 5% SiO₂, the electrical life of the film can be increased to 3.4 times that of pure polyimide, while after adding 5% GAPD, the electrical life of the film can be increased to 4.77 times that of pure polyimide. The influence mechanism of the two modification methods is different. Adding SiO₂ is to introduce the crystal of Si-O-Si structure to form a nanocomposite system, and improves the high frequency creeping discharge resistance of the material through interface and other actions. Adding GAPD is to introduce Si-O-Si network with uniform distribution and no phase separation into polyimide, making the matrix structure more compact. At the same time, uniform flocculent inorganic particles are formed after the outer layer is destroyed, and the synergy of multiple factors can effectively improve the high frequency creeping discharge life of the material. Modifying the molecular structure of polyimide by GAPD can functionalize its silicon oxygen and obtain more excellent physical and chemical properties and discharge resistance, which has potential application value.

Key words： Polyimide silicon oxygen functionalization Polyimide physicochemical properties silicon oxygen functionalization physicochemical properties high frequency creeping discharge electrical life high frequency creeping discharge electrical life

Received: 30 March 2020

PACS:

TM211

Fund:国家自然科学基金资助项目（51737005, 51929701）

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	Ding Zian
	Ding Zian
	Huang Xuwei
	Huang Xuwei
	Li Qingmin
	Guo Yujin
	Li Qingmin
	Lin Jun
	Guo Yujin
	Lin Jun

Cite this article:

Ding Zian,Ding Zian,Huang Xuwei等. A Comparative Study on the High Frequency Creeping Discharge Lifetime of Two Kinds of Functionalized Siloxy-Containing Polyimide Films[J]. Transactions of China Electrotechnical Society, 2021, 36(13): 2719-2729.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200316 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I13/2719

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