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Epoxy resin composition for transformers and process for casting transformer by composition

A technology of epoxy resin and transformer, applied in the field of resin, can solve the problems of increased partial discharge and blooming

Active Publication Date: 2010-01-27
广东康德威电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing epoxy resin compositions are simply blending flame retardants and epoxy resins for thermal curing. Blooming often occurs after blending and thermal curing, resulting in an increase in partial discharge

Method used

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  • Epoxy resin composition for transformers and process for casting transformer by composition
  • Epoxy resin composition for transformers and process for casting transformer by composition
  • Epoxy resin composition for transformers and process for casting transformer by composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, the raw material of epoxy resin composition comprises following component, and content (weight part) is:

[0041] epoxy resin 100

[0042] Hardener 100

[0043] Toughener 10

[0044] Accelerator 0.05.

[0045] The technological process of pouring the transformer with the epoxy resin composition of the present embodiment is:

[0046] A. Pre-bake the epoxy resin, curing agent, toughener and accelerator at 75°C for 2.5 hours, and the coil at 105°C for 9.5 hours;

[0047] B. Put the pre-baked mold into the pouring tank after inspection, close the feeding valve, start the power supply of the pouring equipment, turn on the air compressor and water pump, and then start the heating system of the pouring tank to check whether there is any abnormality in the equipment. , and then preheat the mixer to 65°C in advance, and the pouring tank to 75°C;

[0048] C. Feeding, according to the process formula (parts by weight): put 100 parts of epoxy resin, 100 parts of ...

Embodiment 2

[0055] Embodiment 2, the raw material of epoxy resin composition comprises following component, and content (weight part) is:

[0056] epoxy resin 100

[0057] Hardener 100

[0058] Toughener 8

[0059] Accelerator 0.001.

[0060] The technological process of pouring the transformer with the epoxy resin composition of the present embodiment is:

[0061] A. Pre-bake the epoxy resin, curing agent, toughener and accelerator at 65°C for 1.5 hours, and the coil at 95°C for 8.5 hours;

[0062] B. Put the pre-baked mold into the pouring tank after inspection, close the feeding valve, start the power supply of the pouring equipment, turn on the air compressor and water pump, and then start the heating system of the pouring tank to check whether there is any abnormality in the equipment. , and then preheat the mixer to 55°C in advance, and the pouring tank to 65°C;

[0063] C. Feeding, according to the process formula (parts by weight): put 100 parts of epoxy resin, 100 parts of c...

Embodiment 3

[0068] Embodiment 3, the raw material of epoxy resin composition comprises following component, and content (weight part) is:

[0069] epoxy resin 100

[0070] Hardener 100

[0071] Toughener 9

[0072] Accelerator 0.025.

[0073] The technological process of pouring the transformer with the epoxy resin composition of the present embodiment is:

[0074] A. Pre-bake the epoxy resin, curing agent, toughening agent and accelerator at 70°C for 1 hour, and pre-bake the coil at 100°C for 9 hours;

[0075] B. Put the pre-baked mold into the pouring tank after inspection, close the feeding valve, start the power supply of the pouring equipment, turn on the air compressor and water pump, and then start the heating system of the pouring tank to check whether there is any abnormality in the equipment. , and then preheat the mixer to 60°C in advance, and the pouring tank to 70°C;

[0076] C. Feeding, according to the process formula (parts by weight): put 100 parts of epoxy resin, 10...

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Abstract

The invention relates to the technical field of resin, in particular to an epoxy resin composition for transformers and a process for casting a transformer by the composition. The composition comprises epoxy resin, a curing agent, a toughening agent and an accelerating agent, the epoxy resin is a mixture of general formula (I), the epoxy groups on both terminals have reactive activity in the composition unit of the general formula (I), bisphenol A framework provides strong toughness and thermal endurance, a methylene chain has flexibility, ether bond has chemical resistance, and hydroxyl has reactivity and adhesiveness. Brominated epoxy resin of halogenated epoxy resin is taken as an fire retardant, and can be reactive fire retardant and also as flame retardant epoxy resin, thus fire resistance of the cast coil is good, and local discharge is small.

Description

Technical field: [0001] The invention relates to the technical field of resins, in particular to an epoxy resin composition for a transformer and a process for casting the transformer with the composition. Background technique: [0002] Epoxy resin is a kind of thermosetting polymer synthetic material with good viscosity, corrosion resistance, electrical insulation, high strength and other properties, so epoxy resin is widely used in casting of dry-type transformers. Epoxy resins generally refer to organic polymer compounds containing two or more epoxy groups in their molecules. Except for a few, their relative molecular weights are not high. The molecular structure of epoxy resin is characterized by active epoxy groups in the molecular chain, and the epoxy groups can be located at the end, middle or ring structure of the molecular chain. Due to the active epoxy groups in the molecular structure, they can undergo cross-linking reactions with various types of curing agents t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08G59/22B29C39/10B29C39/38B29C39/22B29C39/44B29B13/06
Inventor 丁碧云钟汉良
Owner 广东康德威电气股份有限公司
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