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Curing method of nanocrystalline magnetic core

A curing method and nanocrystalline technology, applied in the direction of transformer/inductor magnetic core, inductor/transformer/magnet manufacturing, non-polymer organic compound adhesive, etc., can solve the problems of reduced magnetic core performance and large shrinkage stress, etc. Achieve the effect of reducing internal stress, overcoming poor toughness and overcoming brittleness

Active Publication Date: 2021-02-02
FUYANG NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional dipping and curing of magnetic cores uses epoxy resin glue as the binder of the magnetic core to bake and cure for a long time at high temperature (greater than 100°C). The shrinkage stress of the existing epoxy resin glue after curing is relatively large , it is easy to force the magnetic core and cause the performance of the magnetic core to decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for solidifying a nanocrystalline magnetic core, comprising the following steps:

[0026] (1) Heat 10 parts of polyester polyol to 90°C for reflux dehydration, cool down, add 4 parts of diphenylmethane diisocyanate to react at 55°C for 1 hour, cool to room temperature, add 2 parts of 1,4-butanediol and 0.1 parts Stir trimethylolpropane evenly to obtain a polyurethane prepolymer, then add 120 parts of bisphenol A epoxy resin to the polyurethane prepolymer and react for 1 hour to obtain a polyurethane modified epoxy resin;

[0027] (2) 50 parts of step (1) made polyurethane modified epoxy resin, 25 parts of bisphenol A epoxy acrylate, 12 parts of dipropylene glycol diacrylate, 3 parts of 1-hydroxycyclohexyl phenyl ketone, Mix 0.6 parts of defoamer Defom5300, 1.2 parts of wetting agent TEGOWet KL 245, and 1.2 parts of leveling agent BYK-320 and stir until uniform to form a glue; the above parts are all in parts by weight;

[0028] (3) Soak the heat-treated nanocr...

Embodiment 2

[0032] (1) Heat 10 parts of polyester polyol to 90°C for reflux dehydration, cool down, add 4 parts of diphenylmethane diisocyanate to react at 55°C for 1 hour, cool to room temperature, add 2 parts of 1,4-butanediol and 0.1 parts Stir trimethylolpropane evenly to obtain a polyurethane prepolymer, then add 120 parts of bisphenol A epoxy resin to the polyurethane prepolymer and react for 1 hour to obtain a polyurethane modified epoxy resin;

[0033] (2) 60 parts of step (1) made polyurethane modified epoxy resin, 18 parts of bisphenol A epoxy acrylate, 9 parts of dipropylene glycol diacrylate, 2 parts of 1-hydroxycyclohexyl phenyl ketone, Mix 1 part of defoamer Defom5300, 1.5 parts of wetting agent TEGOWet KL 245, and 1.5 parts of leveling agent BYK-320 and stir until uniform to form a glue; the above parts are all in parts by weight;

[0034] (3) Soak the heat-treated nanocrystalline magnetic core in the glue solution for 45 seconds;

[0035] (4) Dry the dipped magnetic core ...

Embodiment 3

[0038] (1) Heat 10 parts of polyester polyol to 90°C for reflux dehydration, cool down, add 4 parts of diphenylmethane diisocyanate to react at 55°C for 1 hour, cool to room temperature, add 2 parts of 1,4-butanediol and 0.1 parts Stir trimethylolpropane evenly to obtain a polyurethane prepolymer, then add 120 parts of bisphenol A epoxy resin to the polyurethane prepolymer and react for 1 hour to obtain a polyurethane modified epoxy resin;

[0039] (2) 43 parts of step (1) made polyurethane modified epoxy resin, 29 parts of bisphenol A epoxy acrylate, 15 parts of dipropylene glycol diacrylate, 4 parts of 1-hydroxycyclohexyl phenyl ketone, Mix 0.4 parts of defoamer Defom5300, 0.5 parts of wetting agent TEGOWet KL 245, and 1.1 parts of leveling agent BYK-320 and stir until uniform to form a glue; the above parts are all in parts by weight;

[0040] (3) Soak the heat-treated nanocrystalline magnetic core in the glue solution for 45 seconds;

[0041] (4) Dry the dipped magnetic c...

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Abstract

The invention discloses a curing method of a nanocrystalline magnetic core, and belongs to the technical field of magnetic core material preparation. The method comprises the following steps: firstly,mixing 40-60 parts of polyurethane modified epoxy resin, 15-30 parts of bisphenol A epoxy acrylate, 8-15 parts of dipropylene glycol diacrylate, 2-4 parts of 1-hydroxycyclohexyl phenyl ketone, 0.2-1part of an antifoaming agent, 0.3-1.5 parts of a wetting agent and 0.5-1.5 parts of a leveling agent, and uniformly stirring to form a glue solution; then, soaking the nanocrystalline magnetic core subjected to heat treatment in the glue solution, wherein the soaking time is 30-60s; and finally, airing the impregnated magnetic core till that there is no residual glue solution on a surface, and then curing the impregnated magnetic core through a UV photocuring instrument, wherein a curing temperature ranges from 25 DEG C to 30 DEG C, and the curing time ranges from 5s to 15s. The method is easyto operate and low in cost, a stress borne by the cured magnetic core can be greatly reduced, and the cured magnetic core can keep good performance.

Description

technical field [0001] The invention relates to a curing method for a nanocrystalline magnetic core, belonging to the technical field of magnetic core material preparation. Background technique [0002] Nanocrystalline magnetic cores are generally made of nanocrystalline alloy strips after winding and heat treatment, and are often used to make magnetic heads, transformers, choke coils, high-efficiency motors, reactors, etc. Nanocrystalline alloy strips begin to become brittle due to structural relaxation and other reasons during heat treatment, and their toughness is poor. When subjected to external forces, the magnetic core is brittle, and the soft magnetic properties decrease accordingly, which seriously affects the subsequent application of the magnetic core. In order to solve the problem of poor toughness and brittleness of the magnetic core, the heat-treated nanocrystalline magnetic core is generally dipped and cured first, and then put into a protective box of a corres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F41/00H01F27/25C09J4/06C09J4/02C08G18/12C08G18/66C08G18/42C08G18/32C08G18/58
CPCH01F41/02H01F41/005H01F27/25C09J4/06C08G18/12C08G18/42C08G18/3206C08G18/664C08G18/6644C08G18/4045C08G18/58
Inventor 邓毕力王玉川罗顶飞潘振海晋立从冯英杰徐敏义
Owner FUYANG NORMAL UNIVERSITY
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