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Preparing method for soft rubber NdFeB (neodymium iron boron) magnet

A rubber neodymium iron boron and neodymium iron boron technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of easy cracking, peeling, poor toughness of the surface coating, and improve the anti-oxidation effect. , Improve the bonding strength, the effect of excellent strength

Active Publication Date: 2014-02-12
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems that the flexible rubber NdFeB magnets in the prior art have low bonding strength with rubber during processing, the magnetic powder is easy to fall off from the surface of the product, the toughness is poor, easy to break, and the surface coating is easy to crack and peel off. A preparation method of a flexible rubber NdFeB magnet is provided. The preparation method has simple steps, and the obtained flexible rubber NdFeB magnet has good magnetic properties and toughness, and the coating on the surface is not easy to bend when the flexible rubber NdFeB magnet is bent. cracking, peeling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Surface modification: firstly wash the rapidly quenched NdFeB magnetic powder with NaOH solution with a concentration of 0.1mol / L for 15 minutes, and then wash the rapidly quenched NdFeB magnetic powder with 50°C deionized water until the quenching The pH of the NdFeB magnetic powder is neutral, and then the fast-quenched NdFeB magnetic powder is dried at a constant temperature at 40°C and placed in ethanol for ultrasonic dispersion for 5 minutes, and then the fast-quenched NdFeB magnetic powder is dried at 90°C for 1 hour, and then added Ultrasonic dispersion in the surface modifier for 10 minutes, soaking for 12 hours, and finally drying in vacuum at 60°C to obtain surface-modified fast-quenched NdFeB magnetic powder, wherein the mass ratio of fast-quenched NdFeB magnetic powder to surface modifier The mass percentage of each component in the modifier is: 10% of silane coupling agent KH550, 10% of flexible epoxy resin JEF-0240, 3% of modified amine curing agent JH-...

Embodiment 2

[0054] (1) Surface modification: firstly wash the rapidly quenched NdFeB magnetic powder with NaOH solution with a concentration of 0.3mol / L for 10 minutes, and then wash the rapidly quenched NdFeB magnetic powder with 80°C deionized water until the quenching The pH of the NdFeB magnetic powder is neutral, and then the quick-quenched NdFeB magnetic powder is dried at a constant temperature at 50°C and placed in ethanol for ultrasonic dispersion for 10 minutes, and then the quick-quenched NdFeB magnetic powder is dried at 80°C for 2 hours, and then added Ultrasonic dispersion in the surface modifier for 30 minutes, soaking for 10 hours, and finally drying in vacuum at 80°C to obtain surface-modified fast-quenched NdFeB magnetic powder, wherein the mass ratio of fast-quenched NdFeB magnetic powder to surface modifier 1:5, the mass percentage of each component in the modifier is: silane coupling agent KH550 5%, flexible epoxy resin JEF-0242 15%, modified amine curing agent JH-0111...

Embodiment 3

[0066] (1) Surface modification: firstly wash the rapidly quenched NdFeB magnetic powder with NaOH solution with a concentration of 0.2mol / L for 12 minutes, and then wash the rapidly quenched NdFeB magnetic powder with deionized water at 60°C until the quenching The pH of the NdFeB magnetic powder is neutral, and then the quick-quenched NdFeB magnetic powder is dried at a constant temperature at 45°C and then ultrasonically dispersed in ethanol for 6 minutes, and then the fast-quenched NdFeB magnetic powder is dried at 85°C for 1.5h, and then Add surface modifier to ultrasonic dispersion for 15 minutes, soak for 11 hours, and finally dry in vacuum at 70°C to obtain surface-modified fast-quenched NdFeB magnetic powder. Among them, the mass of fast-quenched NdFeB magnetic powder and surface modifier The ratio is 1:3~5, and the mass percentage of each component in the modifier is: silane coupling agent KH550 6%, flexible epoxy resin JEF-0242 11%, modified amine curing agent JH-011...

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Abstract

The invention discloses a preparing method for a soft rubber NdFeB (neodymium iron boron) magnet and solves the problems that during the machining of the soft rubber NdFeB magnet in the prior art, the binding strength with rubber is lower, magnetic powder is easily stripped from the surface of a product, the tenacity is poor, cracking easily occurs, and the surface coating is easy to crack and strip. The method comprises the following steps of (1) surface modifying; (2) burdening; (3) open refining; (4) closed refining; (5) smashing; (6) tabletting; (7): laminating; (8) cutting; (9) spraying and (10) magnetizing. The raw materials of the NdFeB magnet and sprayed components of the coating are modified, before being subjected to the surface modifying, the rapid quenched NdFeB magnetic powder is preprocessed, and the drying process after the coating is sprayed is also optimally designed. The soft rubber NdFeB magnet manufactured by the preparing method has excellent strength and tenacity as well as excellent magnetic performance, and the binding strength of the coating at the surface of the soft rubber NdFeB magnet and the soft rubber NdFeB magnet is strong, so cracking difficultly occurs.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet, in particular to a preparation method of a flexible rubber neodymium-iron-boron magnet. [0002] Background technique [0003] NdFeB materials are high-performance metal magnetic materials. The traditional NdFeB processing is a sintering electroplating process. This process is highly dependent on the mold, and the product has high hardness (rigid NdFeB composite material) and large volume. Later, NdFeB materials were produced by mixing epoxy resin and other adhesives with NdFeB for molding, injection molding and other processes. The hardness of the product was also high, and it could not be bent, so it could not be made into a thin and flexible product. [0004] With the miniaturization and precision transformation of various electronic and electrical products, more and more products need to use flexible magnetic materials that are thin in thickness, high in performance, and can be bent freely. ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F7/02H01F1/057
Inventor 赵宇航翁德明金顽强胡一涛
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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