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Casting mixture for epoxy casting transformer and preparation method thereof

A technology of epoxy casting and preparation method, which is applied in the field of epoxy casting, which can solve the problems of lower quality of casting transformer products, difficult diffusion of air bubbles, insufficient wetting of mixture, etc., to improve market competitiveness and reduce shrinkage and thermal expansion coefficient, beautify the appearance of the effect

Active Publication Date: 2010-06-16
PINGGAO GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unreasonable addition of various mixtures in this method, the mixture cannot be fully wetted, local gel is produced, the viscosity of the mixture is not enough, and the bubbles generated during stirring are not easy to fully diffuse, etc., these situations will cause internal stress concentration , The toughness is not enough, which will easily cause the cracking of the casting body, which will greatly reduce the product quality of the casting transformer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The casting mixture of the epoxy casting transformer of the present invention includes the following raw materials in parts by weight: 1 part of epoxy resin, 2.5 parts of silicon micropowder, 0.1 part of toughening agent, 0.6 part of curing agent, and 0.001 part of accelerator. (All raw materials are commercially available products)

[0018] The pouring compound preparation method of the epoxy pouring transformer of the present invention comprises the following steps:

[0019] (1) Chemicals:

[0020] Put the epoxy resin in an oven, set the temperature at 95°C, and melt it into a dilute liquid; put the silicon micropowder in a container and place it in the oven, set the temperature at 95°C, and pre-bake for 6 hours;

[0021] (2) Preparation:

[0022] 1) First start the heating device of the mixing tank to ensure that the temperature in the tank is 95°C, add molten epoxy resin according to the above-mentioned parts by weight, then start the stirring device, and mix the ...

Embodiment 2

[0025] The casting compound of the epoxy casting transformer of the present invention includes the following raw materials in parts by weight: 1 part of epoxy resin, 2.6 parts of silicon micropowder, 0.12 parts of toughening agent, 0.01 part of color paste, 0.62 parts of curing agent, and 0.0015 parts of accelerator share. (All raw materials are commercially available products)

[0026] The pouring compound preparation method of the epoxy pouring transformer of the present invention comprises the following steps:

[0027] (1) Chemicals:

[0028] Put the epoxy resin in an oven, set the temperature at 105°C, and melt it into a dilute liquid; put the silicon micropowder in a container and place it in the oven, set the temperature at 105°C, and pre-bake for 6.5 hours;

[0029] (2) Preparation:

[0030] 1) First start the heating device of the mixing tank to ensure that the temperature in the tank is 105°C, add molten epoxy resin according to the above-mentioned parts by weight,...

Embodiment 3

[0033] The casting compound of the epoxy casting transformer of the present invention includes the following raw materials in parts by weight: 1 part of epoxy resin, 2.9 parts of silicon micropowder, 0.16 parts of toughening agent, 0.015 parts of color paste, 0.66 parts of curing agent, and 0.002 parts of accelerator. share.

[0034] The pouring compound preparation method of the epoxy pouring transformer of the present invention comprises the following steps:

[0035] (1) Chemicals:

[0036] Put the epoxy resin in an oven, set the temperature at 120°C, and melt it into a dilute liquid; put the silicon micropowder in a container and place it in the oven, set the temperature at 120°C, and pre-bake for 7 hours;

[0037] (2) Preparation:

[0038] 1) First start the heating device of the mixing tank to ensure that the temperature in the tank is 120°C, add molten epoxy resin according to the above-mentioned parts by weight, then start the stirring device, and mix the pre-baked si...

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PUM

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Abstract

The invention discloses a casting mixture for an epoxy casting transformer, which comprises the following raw materials in part by weight: 1 part of epoxy resin, 2.5 to 3.1 parts of silicon micropowder, 0.1 to 0.2 part of toughening agent, 0 to 0.02 part of color paste, 0.6 to 0.7 part of curing agent, and 0.001 to 0.003 part of accelerating agent. The preparation method for the casting mixture comprises the following steps: melting the materials; adding the silicon micropowder, the toughening agent, the color paste, the curing agent, and the accelerating agent in the melted epoxy resin in turn under the conditions of heating and stirring; and then performing vacuum defoamation. Due to the adoption of mixed glue prepared from the components of the casting mixture by the preparation method thereof, the crack ratio of a cast casting body can be reduced, and the quality of the product can be improved.

Description

technical field [0001] The invention relates to a casting mixture for an epoxy casting transformer and a preparation method thereof, belonging to the technical field of epoxy casting. Background technique [0002] Epoxy casting material is a high molecular polymer formed by curing and polycondensation of epoxy resin. It is less affected by ambient temperature, humidity, sunlight and oxygen, and its performance is stable. Add a curing agent to the molten epoxy resin, that is, epoxy glue, to make it cross-linked into a macromolecular cured product with a network structure at a certain temperature. The cooled cast body has good mechanical properties and electrical insulation. Therefore, It is often used on high-voltage electrical appliances to support and insulate. [0003] The current epoxy casting process includes mold loading, mixture preparation, pouring and curing. The preparation method is to mix epoxy resin and filler, heat and stir, then mix curing agent and other auxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K3/36C08J3/20
Inventor 王普庆温铭丽唐慧刚王红庆
Owner PINGGAO GRP
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