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Bonded permanent magnet and production method thereof

A technology of bonding magnets and magnetic powders, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of difficult demoulding, large magnet demoulding force, uneven distribution of lubricants, etc., to reduce magnet stripping Mold force, increased binding force, uniform distribution effect

Active Publication Date: 2014-04-30
MAGNEQUENCH (TIANJIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bonded magnet and its preparation method to solve the problem of uneven distribution of the lubricant in the bonded magnetic powder caused by the dry mixing of the lubricant in the prior art, so that the release force of the magnet is relatively large, and the release force of the magnet is relatively large. difficult question

Method used

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  • Bonded permanent magnet and production method thereof
  • Bonded permanent magnet and production method thereof
  • Bonded permanent magnet and production method thereof

Examples

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preparation example Construction

[0025] In order to solve the problems in the prior art that the lubricant is unevenly distributed in the bonded magnetic powder and the release force of the final bonded magnet is relatively large and the release is difficult, the present invention provides a preparation method of the bonded magnet, such as figure 2 As shown, the following steps are included: S1, mixing rare earth magnetic powder and thermosetting epoxy resin to obtain rubber mixing powder; S2, wet mixing lubricant and rubber mixing powder, and drying to obtain rare earth bonded magnetic powder; and S3, mixing rare earth magnetic powder The bonded magnetic powder is molded to obtain a rare earth bonded magnet.

[0026] When mixing rare earth magnetic powder mixed with thermosetting epoxy resin and lubricant, the wet mixing method is used instead of the current dry mixing lubricant method. Finally, a uniform lubricant coating film is formed on the surface of the mixed powder, thereby increasing Improve the bin...

Embodiment 1

[0038] 1) Take 135g of bisphenol-a epoxy resin (provided by Huanqi Chemical (Guangdong) Co., Ltd., model NPES902), and dissolve bisphenol-a epoxy resin in acetone (according to bisphenol-a epoxy resin and The mass ratio of acetone is mixed at 1:10) to obtain the dissolved bisphenol A epoxy resin.

[0039] 2) Mix the bisphenol A-type epoxy resin dissolved in step 1) with NdFeB magnetic powder (model MQP-15-9HD) under vacuum conditions to obtain mixed rubber powder; dissolve the lubricant stearic acid into In absolute ethanol (by weight, M 硬脂酸 :M 乙醇 =1:10), to obtain stearic acid ethanol solution. The stearic acid ethanol solution and the rubber compound powder are mixed in a mixing bucket, and then placed at room temperature to evaporate and dry the ethanol to obtain a bonded magnetic powder. Among them, the weight ratio of NdFeB magnetic powder, bisphenol A type epoxy resin and stearic acid is 95:4.5:0.5.

[0040] The operation method of Example 1 was repeated three times,...

Embodiment 2

[0042] The operation steps and methods are the same as in Example 1, except that the ethanol stearic acid liquid and the rubber mixing powder are not mixed directly, but the ethanol stearic acid liquid and the rubber mixing powder are sprayed and mixed by mixing equipment . The specific steps are: put the mixed rubber powder in the LDH-03 coulter mixer, start the heating device of the coulter mixer to heat the mixed rubber powder to 40°C, rotate at a speed of circle / 7s, and evacuate to 100pa , start the spraying device, the spraying pressure is 0.3MPa, put the stearic acid ethanol liquid in the spraying device, and spray the stearic acid ethanol liquid on the surface of the rubber mixture under vacuum (vacuum degree is less than 100pa) to obtain the sticky Junction magnetic powder.

[0043] The operation method of Example 2 was repeated three times, which were respectively recorded as Examples 2b-2d.

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Abstract

The invention discloses a bonded permanent magnet and a production method thereof. The production method includes S1, mixing rare earth magnetic powder with thermoset epoxy resin to acquire mixed rubber powder; S2, mixing the mixed rubber powder with lubricant in wet, and drying to acquire rare earth bonded magnetic powder; S3, forming the rare earth bonded magnetic powder to acquire bonded magnetic powder. The rare earth magnetic powder mixed with thermoset epoxy resin is mixed with the lubricant, a wet-mixing method replaces dry-mixing lubricant method to form a layer of even lubricant wrapping film on the surface of the mixed rubber powder, so that binding force of the mixed rubber powder and the lubricant is increased, the problem that the mixed rubber powder is separated from the lubricant during the mixed rubber powder feeding process is solved, so that the distribution of the lubricant in the mixed rubber powder is even. Compared with the method utilizing dry-mixing lubricant method to prepare the bonded permanent magnet, the bonded permanent magnet production method can produce bonded permanent magnet has similar magnet property, crushing strength and high magnet forming property, and greatly reduce magnet knockout press.

Description

technical field [0001] The invention relates to the technical field of bonded magnetic powder, in particular to a bonded magnet and a preparation method thereof. Background technique [0002] The rare earth bonded magnet is pressed into a rare earth bonded magnet by a mixture of rare earth iron boron magnetic powder, thermosetting epoxy resin and lubricant in a press mold, and then it is cured and coated, and finally applied to the motor. The existing bonded magnetic powder generally adopts dry mixing method to mix lubricants in the process, and the types of lubricants generally include zinc stearate, lithium stearate, boron nitride and Teflon, etc. Compared with the rare earth magnetic powder compound without adding lubricant, in the process of magnetic powder molding, due to the addition of lubricant, the friction force between the magnetic powder particles is reduced, the formability of the magnetic powder is improved, and the magnet demoulding time is reduced. Excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/053H01F1/08B22F3/02
Inventor 孙宝利弓凯斌王双成陈克荣赵巍王望成何峰
Owner MAGNEQUENCH (TIANJIN) CO LTD
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