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Electrostatic spraying method for permanent magnets

A technology of electrostatic spraying and permanent magnets, which is used in devices, coatings, powder coatings, etc. to apply liquid to the surface. The effect of production process cost

Inactive Publication Date: 2017-06-13
上海安稷新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a new surface coating electrostatic spraying method to solve the problem of assembly size tightness and assembly firmness of the above-mentioned epoxy resin surface treatment magnet in the motor slot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment relates to a method for electrostatic spraying of NdFeB permanent magnets, comprising the following steps:

[0031] Take a 30mm*20mm*5mm NdFeB magnet workpiece, after chamfering and sandblasting, fix it on the electrostatic spraying rack and connect the power supply of the spraying equipment.

[0032] Simultaneously, the thermosetting type bisphenol A epoxy polyester resin powder used in this embodiment, p-toluenesulfonyl hydrazide expansion agent and dimethyl imidazole curing agent are mixed according to the percentage by weight of 90%, 5%, 5% respectively Finally, pour it into the material box of the spraying equipment, and adjust the electrostatic voltage of the equipment to 80000V, and use a spray gun nozzle with a diameter of 1mm. After the adjustment is completed, start to spray the front and back of the sample fixed on the hanger successively. During the spraying process, the single spraying time on each side of the workpiece is 5s, and the spray...

Embodiment 2

[0035] This embodiment relates to a method for electrostatic spraying of NdFeB permanent magnets, comprising the following steps:

[0036] Take a 30mm*20mm*5mm NdFeB magnet workpiece, after chamfering and sandblasting, place it flat on the sample plate for electrostatic spraying, and connect the power supply of the spraying equipment.

[0037] Simultaneously, after the thermosetting type bisphenol A epoxy polyester resin powder used in the present invention, p-toluenesulfonyl hydrazide expansion agent and dimethylimidazole curing agent are mixed according to the percentage by weight of 99%, 0.5%, 0.5% respectively Pour it into the material box of the spraying equipment, adjust the electrostatic voltage of the equipment to 80000V, and use a spray gun nozzle with a diameter of 1mm. After the adjustment is completed, start to spray the first side of the sample for 10s. After the first side is sprayed, the sample is turned over and the second side is sprayed for 10 seconds. The ...

Embodiment 3

[0040]This embodiment relates to a method for electrostatic spraying of NdFeB permanent magnets, comprising the following steps:

[0041] Take a 30mm*20mm*5mm NdFeB magnet workpiece, after chamfering and sandblasting, place it flat on the sample plate for electrostatic spraying, and connect the power supply of the spraying equipment.

[0042] Simultaneously, after the thermosetting type bisphenol A epoxy polyester resin powder used in the present invention, p-toluenesulfonyl hydrazide expansion agent and dimethylimidazole curing agent are mixed according to the percentage by weight of 99%, 0.9%, 0.1% respectively Pour it into the material box of the spraying equipment, adjust the electrostatic voltage of the equipment to 80000V, and use a spray gun nozzle with a diameter of 1mm. After the adjustment is completed, start to spray the first side of the sample for 10s. After the first side is sprayed, the sample is turned over and the second side is sprayed for 10 seconds. The e...

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Abstract

The invention provides an electrostatic spraying method for permanent magnets. The electrostatic spraying method includes the steps of spraying powder coatings onto surfaces of permanent magnet workpieces electrostatically to form a powder layer under voltage ranging from 20000 to 80000 V; subjecting the permanent magnet workpieces with the powder layer to the process of intermediate curing at the temperature of 70-120 DEG C, and the carrying out the process of final curing at the temperature of 120-200 DEG C. Compared with the prior coating method, the electrostatic spraying method has the advantages of short processing flow, high production efficiency and capability of improving assembly firmness of the permanent magnet workpieces obviously while reducing production cost greatly.

Description

technical field [0001] The invention relates to an electrostatic spraying method of a permanent magnet, belonging to the technical field of surface treatment of permanent magnet materials. Background technique [0002] In recent years, the market demand and industrial scale of NdFeB permanent magnet materials are developing rapidly, and its application fields cover many industries such as modern industrial motors, microelectronic motors, and new energy motors. Sintered NdFeB magnets are mainly composed of many strong magnetic Nd 2 Fe 14 B main phase grains and neodymium-rich phases uniformly wrapping these main phase grains, and this two-phase sintered structure ensures that the magnet can have sufficiently high density and excellent magnetic properties. But at the same time, because the electrode potential of the intergranular neodymium-rich phase is extremely negative, and the potential difference with the main phase grains forms a corrosion primary battery, the magnet i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D1/06B05D3/00C09D163/00C09D5/03C09D7/12
Inventor 张官友张权张琦
Owner 上海安稷新材料股份有限公司
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