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High-strength epoxy impregnating varnish capable of using at ultra-low temp. and its preparation and application method

A high-strength, extremely low-temperature technology, applied in epoxy resin coatings, coatings, etc., can solve problems such as low strength, affecting the impregnation performance of insulating varnishes, and embrittlement

Inactive Publication Date: 2003-09-24
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now ordinary epoxy insulating varnish not only has low strength, but also will be brittle and cracked at extremely low temperature (such as -263°C liquid helium)
Adding fillers can properly improve its low-temperature strength and anti-brittle performance, but the addition of ordinary fillers will increase the viscosity of insulating varnish and affect the impregnation performance of insulating varnish

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, mix 80 grams of epoxy resin and 5 grams of toughened epoxy and heat to 150-250°C, degas and dehydrate for 1-4 hours, then slowly add 5 grams of nano-silica, stir well and slowly cool down to room temperature, so that Nano-silica is suspended in epoxy resin, and finally 50 grams of curing agent anhydride is added to cure. Curing conditions: 1-2 hours at 80-130°C, 1-2 hours at 140-150°C, 160-190°C 5 to 15 hours.

Embodiment 2

[0035] First, mix 120 grams of epoxy resin and 40 grams of toughened epoxy and heat to 150-250 ° C, degas and dehydrate for 1-4 hours, then slowly add 15 grams of nano-silica, r-aminopropyl triethoxy 5 grams of silane, after fully stirring, slowly cool down to room temperature to suspend nano-silica in the epoxy resin, and finally add 130 grams of curing agent anhydride to cure. Curing conditions: 1-2 hours at 80-130°C, 1-2 hours at 140-150°C, 5-15 hours at 160-190°C.

Embodiment 3

[0037] First, mix 100 grams of epoxy resin and 30 grams of toughened epoxy and heat to 150-250 ° C, degas and dehydrate for 1-4 hours, then slowly add 10 grams of nano-silica, r-aminopropyltriethoxy 1 gram of silane, after fully stirring, slowly cool down to room temperature to suspend nano-silica in the epoxy resin, and finally add 100 grams of curing agent anhydride to cure. Curing conditions: 1-2 hours at 80-130°C, 1-2 hours at 140-150°C, 5-15 hours at 160-190°C.

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PUM

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Abstract

The present invention discloses a high-strnegth epoxy inpregnating varnish used at ultralow temp., its preparation method and application method. It is characterized by that it uses epoxy resin and toughened epoxy resin mixture as main agent, uses toughened acid anhydride as solidifying agent and uses nano silicon dioxide filling material as strengthening agent to prepare said invented product. Said preparation method includes the following steps: firstly, mixing epoxy resin and toughened epoxy resin, heating to 150-250 deg.C, evacuating, dewatering for 1-4 hr., slowly adding nano filling material treated by coupling agent, fully-stirring, then slowly cooling to room temp., making the nano filling material suspended in resin, finally adding acid anhydride solidifying agent.

Description

technical field [0001] The invention relates to a high-strength epoxy impregnating varnish added with nano fillers used at extremely low temperatures, which can ensure the stable operation of impregnated and fixed superconducting coils at extremely low temperatures. It is suitable for extremely low temperature magnet devices such as large superconducting magnets in magnetic confinement fusion physics experiment devices and magnets with large and strong magnetic fields. Background technique [0002] Superconducting high-field magnets, large-scale superconducting magnets for magnetic confinement superconducting fusion devices, in order to ensure the operation stability of superconducting magnets and prevent superconducting magnets from quenching, the magnets will be denatured by force and cannot reach the designed magnetic field strength, and the magnets must be impregnated with insulating paint (1) Fix the magnet to ensure the stable operation of the magnet. (2) Provide magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00
Inventor 陈强高秉钧陈敬林
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI