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Preparation method of flexible neodymium iron boron rubber magnetic composite material

A composite material, NdFeB technology, applied in the field of functional polymer composite material preparation, can solve problems such as increasing the manufacturing cost of magnetic materials, and achieve the effect of ensuring permanent magnetic properties, high filling rate, strong practicability and application value

Active Publication Date: 2018-01-05
YANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the particularity of the process, the manufacturing cost of the magnetic material will be greatly increased in the manufacture of rubber magnets

Method used

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  • Preparation method of flexible neodymium iron boron rubber magnetic composite material
  • Preparation method of flexible neodymium iron boron rubber magnetic composite material
  • Preparation method of flexible neodymium iron boron rubber magnetic composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation process:

[0029] 1) Disperse the quenched NdFeB magnetic powder in absolute ethanol to obtain a dispersant with a solid content of magnetic powder of 800g / L, and then add epoxy resin and silane coupling agent to the dispersant.

[0030] The silane coupling agent used is γ-aminopropyltriethoxysilane (KH550), and the usage amount is 2.5% of the weight of the magnetic powder.

[0031] The epoxy resin used is bisphenol A liquid epoxy resin; the added amount is 1.0% of the weight of the magnetic powder.

[0032] A planetary ball mill is used for the ball milling reaction, and the ball mill jar is made of agate material, and the ball-to-material ratio is 2.5:1. The milling speed of the ball mill was 400 rpm, and the milling time was 4 hours to obtain a slurry.

[0033] The slurry is separated by filtration, and the solid phase is taken and placed in a blast dryer to dry at a drying temperature of 80° C. to obtain a modified NdFeB ultrafine powder.

[0034] ...

Embodiment 2

[0043] 1. Preparation process:

[0044] 1) Disperse the quenched NdFeB magnetic powder in absolute ethanol to obtain a dispersant with a solid content of 400g / L of magnetic powder, and then add epoxy resin and silane coupling agent to the dispersant.

[0045] The silane coupling agent used is γ-aminopropyltriethoxysilane (KH550), and the amount used is 1.0% by weight of the magnetic powder.

[0046]The epoxy resin used is bisphenol A liquid epoxy resin; the added amount is 2.5% of the weight of the magnetic powder.

[0047] A planetary ball mill was used for the ball milling reaction, the ball mill jar was made of agate, and the ball-to-material ratio was 10:1. The milling speed of the ball mill is 400 rpm, and the milling time is 4 hours to obtain the slurry.

[0048] The slurry is filtered and separated, and the solid phase is taken and placed in a blast dryer to dry at a drying temperature of 60° C. to obtain a modified NdFeB ultrafine powder.

[0049] 2) Take 0 and 100 ...

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Abstract

The invention provides a preparation method of a flexible neodymium iron boron rubber magnetic composite material, and belongs to the technical field of functional macromolecule composite material preparation. A fast quenching neodymium iron boron magnetic powder is used as raw material, and a modified neodymium iron boron superfine powder is obtained through the protective ball milling in situ surface modification; then the modified neodymium iron boron superfine powder, crude rubber and rubber chemicals are refined in a mixing mode, and mixed refined rubber is obtained; then the flexible neodymium iron boron rubber magnetic composite material is obtained by pulse magnetizing after the hot-pressing vulcanization molding. The rubber magnetic material with good magnetic properties and goodmechanical properties can be obtained by using the preparation method, the magnetic powder filling rate can reach up to 90% under the precondition of keeping good rubber mechanical properties of rubber magnets, and almost no magnetic powder removal phenomenon appears; the composite material is suitable for use in micro-special motors, driving motors and super strong magnetic suction.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional polymer composite materials. Background technique [0002] As an important branch of bonded magnets, flexible NdFeB rubber magnets become a supplement to sintered NdFeB permanent magnets, forming a product system of high-performance NdFeB permanent magnet materials, which are widely used in motors, drives and powerful magnets. . [0003] In the manufacture of high-quality flexible NdFeB rubber magnets, the current technical bottlenecks are: 1) To improve the magnetic properties of rubber, it is necessary to increase the filling rate of magnetic powder; and the increase in the filling rate of magnetic powder will inevitably lead to a decline in the mechanical properties of rubber; 2) Neodymium The compatibility problem between the iron-boron magnetic powder and the rubber organic matrix can easily cause powder removal in the rubber in the magnetic powder, resulting in device perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/06C08K13/06C08K9/04C08K9/06C08K3/38C08K5/12C08K3/22C08K5/09C08J3/28
Inventor 刘俊亮黄浩吕景清高书芮张明黎云峰董城勇
Owner YANGZHOU UNIV