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Vacuum pouring and gelating method for epoxy resin

An epoxy resin and vacuum casting technology, which is applied in household components, applications, encapsulation/impregnation, etc., can solve problems such as unsatisfactory high-voltage electrical insulation devices, single control method, and imperfect process

Active Publication Date: 2018-07-13
DALIAN NORTH INSTR TRANSFORMER GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with the more mature epoxy resin transformers, there are still some imperfections in the process. The relevant processes or documents mainly focus on the consistency of the temperature of the epoxy resin mixture and the mold, and that the gel is cured at a constant temperature in the drying oven. It can be controlled by setting the temperature of the mixing tank and drying oven, the control method is single, and the prepared devices have poor insulation performance and cannot meet the problems of high-voltage electrical insulation devices

Method used

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  • Vacuum pouring and gelating method for epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Pre-bake the 400-mesh microsilica filler to 80°C in the pre-baking system, pre-dry 100 parts of epoxy resin at room temperature and 200 parts of 80°C microsilica filler in a resin stock tank with a vacuum of 150Pa at 70°C. Mix to obtain premix 1; in addition, pre-mix 75 parts of room temperature curing agent and 150 parts of 400-mesh silica powder filler at 80°C in another curing agent stock tank with a vacuum of 140Pa at 70°C to obtain premix 2; These two premixing processes are carried out simultaneously in two different material preparation tanks, and the evacuation and stirring time is 90 minutes; the premixes 1 and 2 prepared in the previous two parts are put into the same vacuum final mixing tank for final mixing, Stirring at 73° C. and vacuum degree of 150 Pa for 35 minutes to obtain the final mixture, the temperature of the final mixture is 75° C.

[0044] (2) Pre-bake the mold at a constant temperature of 85°C for 5.5 hours, and then move it into a normal t...

Embodiment 2

[0048] (1) Pre-bake the 400-mesh silicon micropowder filler in the pre-baking system to 82°C, and put 100 parts of epoxy resin at room temperature and 200 parts of 400-mesh silicon micropowder filler at 82°C in a vacuumized 120Pa resin stock tank at 70°C. Premix to obtain premix 1; in addition, premix 75 parts of room temperature curing agent and 150 parts of 400-mesh silicon micropowder filler at 82°C in another vacuum 120Pa curing agent stock tank at 70°C to obtain premix 2; These two premixing processes are carried out simultaneously in two different material preparation tanks, and the evacuation and stirring time is 60 minutes; the premixes 1 and 2 prepared in the previous two parts are put into the same vacuum final mixing tank for final mixing, Stir for 35 minutes at 70° C. and a vacuum of 120 Pa to obtain the final mixture, and the temperature of the final mixture is 70° C.

[0049] (2) Pre-bake the mold at a constant temperature of 85°C for 5 hours, and then move it in...

Embodiment 3

[0053] (1) Pre-dry the 400-mesh silicon micropowder filler in the pre-baking system to 85°C, put 100 parts of epoxy resin at room temperature and 200 parts of 400-mesh silicon micropowder filler at 85°C in a resin preparation tank with a vacuum of 200Pa at 75°C ℃ to pre-mix to obtain premix 1; in addition, 75 parts of normal temperature curing agent and 150 parts of 400 mesh silica powder filler at 85 ℃ were pre-mixed at 70 ℃ in another curing agent stock tank with a vacuum of 200 Pa to obtain premix Material 2; these two premixing processes are carried out simultaneously in two different material preparation tanks, and the evacuation and stirring time is 120min; the premixes 1 and 2 prepared in the previous two parts are put into the same vacuum final mixing tank. Finally, mix and stir at 75° C. and a vacuum of 200 Pa for 30 minutes to obtain the final mixture. The temperature of the final mixture is 75° C.

[0054] (2) Pre-bake the mold at a constant temperature of 80°C for ...

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Abstract

The invention provides a vacuum pouring and gelating method for epoxy resin, belonging to the technical field of preparation of a mutual inductor. The method comprises the steps: providing a final mixed material for epoxy resin pouring; conducting constant-temperature preheating and cooling a tire for a mould, and thus obtaining a cold-tire mould, wherein the mould comprises a coil winder and a mould base, and a thermal baffle plate is matted between the coil winder and the mould base; the temperature of the coil winder of the cold-tire mould is higher than the temperature of the mould base; under vacuum, pouring the final mixed material into the cold-tire mould, and thus obtaining a pouring model, wherein the temperature of the final mixed material is higher than the temperature of the mould base of the cold-tire mould and is lower than the temperature of the coil winder of the cold-tire mould; and orderly gelating and curing the pouring model. The method ensures that in the gelatingand curing process of the epoxy resin, the epoxy resin on the surface of the coil winder is gelated firstly and is cured from inside to outside. By the method, the mutual inductor has good electricalinsulation strength and tensile strength and high resin curing degree.

Description

technical field [0001] The invention relates to the technical field of transformer preparation, in particular to an epoxy resin vacuum casting gel method. Background technique [0002] Epoxy resin vacuum casting insulation is the process insulation method commonly used in the current transformer industry. It has nearly 50 years of production experience in my country. With the continuous development of the process equipment industry, the epoxy resin vacuum casting process is also constantly improving. . [0003] Compared with the more mature epoxy resin transformers, there are still some imperfections in the process. The relevant processes or documents mainly focus on the consistency of the temperature of the epoxy resin mixture and the mold, and that the gel is cured at a constant temperature in the drying oven. It can be controlled by setting the temperature of the mixing tank and the drying oven, the control method is single, and the prepared device has the problem of poor...

Claims

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Application Information

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IPC IPC(8): B29C39/10B29C39/42B29C39/44H01F41/00B29K63/00B29L31/34
CPCB29C39/10B29C39/42B29C39/44B29K2063/00B29L2031/34H01F41/005
Inventor 李涛昌王仁涛欧希堂高庆利
Owner DALIAN NORTH INSTR TRANSFORMER GROUP
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