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Flexible bonding rare-earth permanent magnet and manufacturing method thereof

A technology of rare earth permanent magnets and manufacturing methods, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve problems such as high fluidity requirements and magnetic performance decline, and achieve good corrosion resistance and easy to overcome Effects of embrittlement and deformation, good flexibility and surface morphology

Active Publication Date: 2010-07-21
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can produce magnets with complex shapes, but because of high fluidity requirements during molding, a large amount of resin must be added, resulting in a decrease in magnetic properties

Method used

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  • Flexible bonding rare-earth permanent magnet and manufacturing method thereof
  • Flexible bonding rare-earth permanent magnet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Magnet formula (weight ratio): NdFeB magnetic powder 91.55%, 3-glycidoxypropyltrimethoxysilane (coupling agent) 0.45%, polyurethane-based thermoplastic elastomer (binder) 6%, stearin Acid (lubricant) 0.5%, dioctyl phthalate (plasticizer) 0.3%, epoxy soybean oil (plasticizer) 0.5%, AO-3[B-(4-hydroxy-3,5- Di-tert-butylphenyl) propionate n-octadecyl ester] (antioxidant) 0.7%.

[0027] First, the magnetic powder is coupled with 3-glycidoxypropyltrimethoxysilane coupling agent and dried, and then the above-mentioned magnetic powder, binder and additive mixture are mixed evenly with a high-speed mixer, and then the mixture is mixed with an open mill The mixture was kneaded at a certain temperature and load until uniform, and then granulated, and finally made into a magnetic sheet with a thickness of 2 mm on a calender.

Embodiment 2

[0029] Magnet formula (weight ratio): NdFeB magnetic powder 94.5%, γ-mercaptopropyltriethoxysilane (coupling agent) 0.5%, polystyrene is the thermoplastic elastomer (binding agent) 3.9% of base material, silicone oil ( lubricant) 0.3%, diisononyl phthalate (plasticizer) 0.5%, WS-245 [triethylene glycol bis(β-(3-tert-butyl-4-hydroxy-5-methyl phenyl) propionate) (antioxidant) 0.3%.

[0030] Firstly, the magnetic powder is coupled with γ-mercaptopropyltriethoxysilane coupling agent and dried, then the magnetic powder, binder and other additives are mixed uniformly in a high-speed mixer, and then mixed with a twin-screw mixer The mixture was uniformly kneaded and granulated under a certain temperature and load, and a magnetic sheet with a thickness of 1 mm was formed by a calender.

Embodiment 3

[0032] Magnet formula (weight ratio): NdFeB magnetic powder 92.4%, γ-aminopropyltriethoxysilane (coupling agent) 0.5%, polyamide-based thermoplastic elastomer (binder) 5.5%, stearic acid and zinc stearate (lubricant) 0.5%, dioctyl phthalate (plasticizer) 0.3%, epoxy soybean oil (plasticizer) 0.4%, AO-27 (N, N'-binaphthalene Base-p-phenylethylamine) (amine antioxidant) 0.4%.

[0033] First, the magnetic powder is coupled with γ-aminopropyltriethoxysilane coupling agent and dried, then the magnetic powder, binder and other additives are mixed uniformly in a high-speed mixer, and then the mixture is mixed with an open mill After uniform mixing under a certain temperature and load, it is granulated, and finally a magnetic sheet with a thickness of 1.4 mm is made on a calender.

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Abstract

The invention provides a flexible bonding rare-earth permanent magnet and a manufacturing method thereof. The flexible bonding rare-earth permanent magnet comprises the following components in percentage by weight: 84.6 to 96.5 percent of NdFeB magnetic powder, 2.5 to 12 percent of bonder of a thermoplastic elastomer with properties of engineering plastics and 1 to 3.4 percent of processing aid, wherein the bonder is a blend of two or three composites of the single thermoplastic elastomers which take polyurethane, polystyrene, polyamide, polyester and polyimide as base materials; and the processing aid comprises a coupling agent, a lubricant and a plasticizer. In the permanent magnet of the invention, the packing ratio of the magnetic powder reaches 96.5 weight percent; the tensile strength, namely the flexibitity, for calendering to form the magnet is more than 3MPa; and while the deficiency of quick magnetic ageing of the flexible magnet at a high temperature is overcome, the shortcomings of easy crack and deformation at a high temperature are also overcome.

Description

technical field [0001] The invention relates to the field of flexible bonded rare earth NdFeB magnets, in particular to providing a flexible bonded rare earth permanent magnet and a manufacturing method thereof by adopting a plastic molding process. Background technique [0002] Flexible bonded permanent magnets are an important branch of bonded magnets. The traditional process is to use ferrite powder as the source of magnetism, use rubber (such as nitrile rubber) as the binder, and use rubber processing to make magnets. Therefore Also known as rubber magnets. Recently, the types of binders have been extended to thermoplastic elastomers such as chlorinated polyethylene (CPE), and the entire process is still a processing method for rubber products. Specifically, it is to use one or more of permanent ferrite powder, rubber binding resin, coupling agent, plasticizer, lubricant and vulcanizing agent, and first pass through a general-purpose rubber mixer or open mixer. Knead t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/00
Inventor 敖学如饶晓雷郭晓燕蔡道炎刘英烈
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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