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Sintered neodymium-iron-boron magnet coated with interpenetrating polymer network coating and preparation method thereof

A technology of polymer coating and interpenetrating network, applied in the field of sintered NdFeB magnets and its preparation, can solve the problems of poor wear resistance, magnet corrosion, easy damage during packaging and transportation, etc.

Active Publication Date: 2018-04-10
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sintered NdFeB magnets are the pillars of rare earth permanent magnet materials, but sintered NdFeB magnets are composed of the main phase Nd 2 Fe 14 B. Composed of Nd-rich phase and B-rich phase, among which metal Nd element has the strongest chemical activity and is easily corroded in humid, high temperature and electrochemical environments, which seriously limits the further expansion of the application field of sintered NdFeB magnets
[0003] In industry, organic polymers are generally used for surface protection. The cathodic electrophoresis epoxy resin coating commonly used in the industry has the advantages of high thickness consistency, strong adhesion between the coating and the substrate, and excellent acid and alkali resistance. However, the hardness of the coating is Small, extremely poor wear resistance, prone to damage during packaging and transportation
Since the epoxy resin coating is a cathodic protective coating, once the coating is damaged, the magnet will suffer severe corrosion, resulting in the failure of the protective coating on the surface of the magnet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A sintered neodymium iron boron magnet coated with an interpenetrating network polymer coating and a preparation method thereof include the following steps:

[0023] a. Coarse treatment: select a block sintered neodymium iron boron magnet with a specification of 32mm×10mm×2mm, grade: 45H, state: unmagnetized, for testing. Remove the oil stain and oxide film on the surface of the sintered NdFeB magnet, use sandblasting process to roughen the magnet, the sandblasting material is 100 mesh brown corundum and quartz sand, the ratio of brown corundum and quartz sand is 4:6, sandblasting The treatment angle is 30°, the sandblasting time is 20s, and the magnet with the roughened surface is ultrasonically cleaned in deionized water for 2 minutes;

[0024] b. Set the total weight of the interpenetrating network polymer coating material to be prepared as 100, epoxy resin 50%, polyurethane 30%, polysiloxane 10%, and toluene diisocyanate 2% as the additive. The balance is balanced with ...

Embodiment 2

[0036] A sintered neodymium iron boron magnet coated with an interpenetrating network polymer coating and a preparation method thereof include the following steps:

[0037] a. Coarse treatment: select a block sintered neodymium iron boron magnet with a specification of 32mm×10mm×2mm, grade: 45H, state: unmagnetized, for testing. Remove the oil stain and oxide film on the surface of the sintered NdFeB magnet, use sandblasting process to roughen the magnet, sandblasting material is 150 mesh brown corundum and quartz sand, the ratio of brown corundum and quartz sand is 3:7, sandblast The treatment angle is 45°, the sandblasting time is 30s, and the magnet with the roughened surface is ultrasonically cleaned in deionized water for 3 minutes;

[0038] b. Set the total weight of the interpenetrating network polymer coating material to be prepared as 100, 45% for epoxy resin, 35% for polyurethane, 15% for polysiloxane, and 3% for carbon black as the additive. The amount is balanced with ...

Embodiment 3

[0054] A sintered neodymium iron boron magnet coated with an interpenetrating network polymer coating and a preparation method thereof include the following steps:

[0055] a. Coarse treatment: Choose a block sintered neodymium iron boron magnet with a size of 32mm×10mm×2mm, grade: 45H, state: unmagnetized, test. Remove the oil stain and oxide film on the surface of the sintered NdFeB magnet, and roughen the magnet by sandblasting. The sandblasting material is a mixture of 200 mesh brown corundum and quartz sand. The ratio of brown corundum and quartz sand is 2:8. Sandblasting The treatment angle is 60°, the sandblasting time is 40s, and the magnet with the roughened surface is ultrasonically cleaned in deionized water for 5 minutes;

[0056] b. Set the total weight of the interpenetrating network polymer coating material to be prepared as 100, 40% for epoxy resin, 40% for polyurethane, 20% for polysiloxane, and dibenzoyl peroxide as the additive 5%, balance the balance with xylen...

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PUM

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Abstract

The invention relates to a sintered neodymium-iron-boron magnet coated with an interpenetrating polymer network coating and a preparation method thereof. The sintered neodymium-iron-boron magnet comprises a sintered neodymium-iron-boron magnet body. The surface of the sintered neodymium-iron-boron magnet is coated with the interpenetrating polymer network coating which is from 11 [mu]m to 19 [mu]mthick. The sintered neodymium-iron-boron magnet is prepared by roughening treatment, preparation of slurry of the interpenetrating polymer network coating, coating treatment and curing treatment. Thesintered neodymium-iron-boron magnet coated with the interpenetrating polymer network coating enjoys excellent resistance to high temperature and high pressure and has anti-aging performance, high anti-corrosion performance and great bonding strength.

Description

Technical field [0001] The invention relates to the field of surface protection of magnetic materials, in particular to a sintered neodymium iron boron magnet coated with an interpenetrating network polymer coating and a preparation method. Background technique [0002] Sintered NdFeB magnets have excellent remanence, coercivity and magnetic energy product, and are called the contemporary "magnet king". Therefore, they are widely used in many fields such as hardware appliances, medical equipment, wind power generation, automobiles, aerospace, and cutting-edge technology. . Sintered NdFeB magnets are the backbone of rare earth permanent magnet materials, but sintered NdFeB magnets are composed of the main phase Nd 2 Fe 14 B. It is composed of Nd-rich phase and B-rich phase. Among them, the metal Nd element has the strongest chemical activity and is easily corroded in humid, high temperature and electrochemical environments, which severely limits the further expansion of the applic...

Claims

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Application Information

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IPC IPC(8): H01F7/02H01F41/02C09D163/00C09D175/04C09D5/08C09D7/61C09D7/63C09D7/65
CPCC08L2201/08C08L2205/03C08L2205/04C09D5/08C09D5/18C09D163/00H01F7/021H01F41/026C08L75/04C08L83/04C08K5/29C08K3/04C08K5/14
Inventor 张鹏杰曹玉杰吴玉程黄秀莲陈静武衣晓飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL