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Encapsulating material for transformer

A technology of packaging materials and dry-type transformers, applied in the direction of transformer/inductor coil/winding/connection, coil manufacturing, etc., can solve the problems of packaging material performance degradation, difficulty in ensuring insulation performance, uneven batches, etc., to achieve good performance, The overall performance does not decline and the effect of prolonging the service life

Active Publication Date: 2014-10-29
中山市盈兴电子有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Traditional epoxy resin has the following defects: strong odor, strong irritation, and pollutes the environment; it is difficult to control the molecular weight during the synthesis process, resulting in uneven batches and affecting batch stability; the process range is small, and the furnace temperature / The rotational speed has a great influence on the application requirements, and it is difficult to form a smooth surface; the adhesive force is too small, and there are inevitably gaps or air bubbles during use, which makes it difficult to ensure insulation performance, poor heat resistance, and is easily affected by electrothermal aging. The overall performance of the packaging material Decrease continuously, and finally affect the service life of the dry-type transformer

Method used

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preparation example Construction

[0044] a. Preparation of graphene oxide: Add 10g flake graphite to 230ml concentrated sulfuric acid in ice-water mixture, while stirring with an electric stirrer, slowly add 30g potassium permanganate, control the reaction temperature to always be less than 5°C, and store 96h; add the obtained dark green liquid to 460ml of deionized water; stir the obtained solution at 35°C for 1.5h, then raise the temperature to 95°C, and react for 1h; add 30ml of 30% hydrogen peroxide while it is hot, let stand for 12h, filter, Wash with 1000ml of 5% hydrochloric acid and 3000ml of deionized water until there is no sulfate ion, and dry the obtained sample at 70°C to obtain graphene oxide;

[0045] b. Preparation of silica sol: add tetraethyl orthosilicate, absolute ethanol and water into the Erlenmeyer flask according to the molar ratio of 1:10:30, with 0.1mol L -1 Hydrochloric acid is used as a catalyst, and the molar ratio of hydrochloric acid to ethyl orthosilicate is 0.015:1. At room tem...

Embodiment 1

[0065] The preparation of the epoxy resin modified by embodiment 1 graphene oxide-silicon dioxide

[0066] In the mixture of ice and water, add 10g flake graphite into 230ml concentrated sulfuric acid, while stirring with an electric stirrer, slowly add 30g potassium permanganate, control the reaction temperature to always be less than 5°C, and store for 96h; add the obtained dark green liquid 460ml of deionized water; the resulting solution was stirred and reacted at 35°C for 1.5h, then heated to 95°C, and reacted for 1h; 30ml of 30% hydrogen peroxide was added while hot, allowed to stand for 12h, filtered, and washed with 1000ml of 5% hydrochloric acid, 3000ml to Ionized water was washed until there was no sulfate ion, and the obtained sample was dried at 70°C to obtain graphene oxide. Ethyl orthosilicate, absolute ethanol and water were added to the Erlenmeyer flask at a molar ratio of 1:10:30 to obtain 0.1mol·L -1 Hydrochloric acid is used as a catalyst, and the molar rat...

Embodiment 2

[0081] The preparation of embodiment 2 maleopimaric anhydride polyamide crosslinking agent

[0082] Put 100g of maleopimaric anhydride and 100g of ethanol with an alcohol concentration of 95% into a reaction vessel, heat to boiling until the maleic anhydride is completely dissolved in ethanol, and put 103g of diethylenetriamine into the reaction vessel for later use , heated to 140°C, added the product prepared in the first step into diethylenetriamine dropwise, then kept the temperature to 140°C, heated at reflux for 2 hours, then slowly increased to 210°C, continued the reaction for 3 hours, and then pumped Vacuum to obtain a brown solid, which is maleopimaric anhydride polyamide.

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Abstract

The invention provides an encapsulating material for a transformer. The encapsulating material comprises graphene oxide-silica modified epoxy resins, a cross-linking agent, a toughening agent, fillers and an accelerant. The encapsulating material has good performance and ensures that the whole performance of an encapsulating component is not decreased. Thus, the service life of the dry-type transformer is prolonged.

Description

technical field [0001] The invention relates to the technical field of dry-type transformers, in particular to a packaging material for transformers. Background technique [0002] Dry-type power transformers include packaging layers and coils. The commonly used packaging layer materials are epoxy resin-based materials. Epoxy resin is a widely used chemical raw material with flame retardant, flame retardant, and superior electrical properties. The insulation strength is higher than that of air and transformer oil. The cast transformer coil has high mechanical strength, excellent moisture-proof and dust-proof performance, and is widely used in urban power grids, especially in places with high fire protection and safety requirements. [0003] Traditional epoxy resin has the following defects: strong odor, strong irritation, and pollutes the environment; it is difficult to control the molecular weight during the synthesis process, resulting in uneven batches and affecting batch ...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L77/06C08K3/04C08K3/36C08G59/50C08G69/26H01F27/30H01F27/32H01F41/04
Inventor 江志鑫
Owner 中山市盈兴电子有限公司
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