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Epoxy resin vacuum pouring technology for protection gas inflation

A technology of epoxy resin and protective gas, which is applied in the field of epoxy resin vacuum filling and protective gas casting technology, which can solve the problems of low electrical insulation strength, surface curing defects, and imperfect technology, and achieve accurate and reliable process connection and high electrical strength , the effect of high mechanical strength

Inactive Publication Date: 2016-05-11
DALIAN NORTH INSTR TRANSFORMER GROUP
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Problems solved by technology

[0003] In order to solve the problems of low electrical insulation strength, tiny bubbles, and surface curing defects in the existing epoxy resin vacuum casting process, the present invention provides an epoxy resin with simple operation, high production efficiency, high electrical strength, and high mechanical strength. Casting Technology of Resin Vacuum Filled with Protective Gas

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  • Epoxy resin vacuum pouring technology for protection gas inflation

Examples

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Embodiment 1

[0019] The epoxy resin vacuum pouring process of this embodiment is as follows: figure 1 Shown:

[0020] (1) Pre-mixing: First, heat the epoxy resin raw material at 120±10°C and the 400-mesh silicon micropowder filler at 80±5°C in a vacuum mixing tank (90±5°C) for pre-mixing, and the epoxy resin The weight ratio of silicon powder and silicon powder is 1:1; in addition, the curing agent methyl tetrahydrophthalic anhydride, toughening agent and silicon powder filler are heated in another vacuum mixing tank (60±5°C) for pre-mixing and curing The weight ratio of methyl tetrahydrophthalic anhydride, isocyanate toughening agent and silica powder filler is 0.65:0.22:1.75: these two premixing processes are carried out simultaneously on two different equipment.

[0021] (2) Final mixing: Put the two premixed materials in the same vacuum mixing tank for final mixing, add organic phosphine accelerator and dyeing agent (organic color paste, H99N-016), heat and vacuum Mix evenly, and ope...

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Abstract

The invention discloses an epoxy resin vacuum pouring process for protection gas inflation, and belongs to the technical field of high-voltage electric appliance resin insulating vacuum pouring. The processes of premixing, final mixing, pouring and curing are sequentially conducted; in the pouring process, a die is put into a pouring tank, the pouring tank is vacuumized to keep pressure, insulating gas SF6 is injected till the pressure intensity in the pouring tank is 30000 Pa to 35000 Pa, and then in the final mixing process, an obtained mixed material is poured in the die. By means of the process, the insulating gas SF6 is introduced in the pouring link, it is ensured that in the epoxy resin pouring process, insulating protection gas is injected into the interlayer and inter-turn parts, hardly filled with resin, of a coil device; after curing, epoxy resin has high electrical insulating strength, no small bubbles or other small defects can be produced, and the mechanical strength of resin is greatly improved.

Description

technical field [0001] The invention relates to the technical field of resin insulation vacuum casting for high-voltage electrical appliances, in particular to an epoxy resin vacuum filling and protective gas casting process for insulation of transformer products. Background technique [0002] Epoxy resin vacuum casting insulation is the process insulation method commonly used in the current transformer industry. It has nearly 20 years of production experience in my country. With the continuous development of the process equipment industry, the epoxy resin casting process is also constantly improving. Compared with the more mature transformer oil-paper insulation form, epoxy resin dry insulation still has its process imperfections, that is, the quality of the overall insulation pouring is closely related to related process production, process equipment (equipment), personnel operation, etc., mainly manifested in Reduced electrical insulation strength, internal tiny air (vacuum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C39/10B29C39/44
Inventor 李涛昌王仁焘高庆利徐进
Owner DALIAN NORTH INSTR TRANSFORMER GROUP
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