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Magnetic particle and its manufacturing method

A technology of magnetic particles and magnetic powder, applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems that have not yet been discovered, and achieve the effect of excellent flame retardant effect and excellent magnetic performance.

Inactive Publication Date: 2006-02-15
MAGNETIC MATERIAL FACTORY MEIZHOU CITY GUANGDONG PROV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Searched by the Guangdong Provincial Information Institute, no similar reports have been found in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Take alnico magnetic powder 40kg, nylon 45kg, magnesium hydroxide 7kg, red phosphorus 5kg, lubricant EBS0.6kg, toning powder TiO 2 Put 2.4kg into the mixer and mix for 2 minutes, then put it into the charging car; then put the mixture into the feed hopper of the screw extruder, the temperature of the heating zone is 215°C, the feeding speed is 1.6m / min, extrude The output speed is 53m / min. After being cooled on the conveyor belt, it is cut into pellets with a diameter of 2mm and a length of 3.5mm with a pelletizer. Then, put the pellets into the injection machine, the temperature is 220°C, and the injection pressure is 76kg / cm 2 , The injection time is 2.5 seconds, the holding time is 5.0 seconds, and the injection is made into a standard flame-retardant sample strip of 30×10×3.2mm for testing.

[0009] The invention is tested by the General Standard Technical Service Co., Ltd., and does not contain hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl...

Embodiment 2

[0014] Take 75kg of ferrite magnetic powder, 18kg of nylon, 3kg of magnesium hydroxide, 3.5kg of red phosphorus, 0.4kg of lubricant EBS, and toning powder TiO 2 Put 0.1kg into the mixer and mix for 5 minutes, then put it into the charging car; then put the mixture into the feeding hopper of the screw extruder, the temperature of the heating zone is 250°C, the feeding speed is 2m / min, and extruded The speed is 56m / min. After being cooled on the conveyor belt, it is cut into pellets with a diameter of 2mm and a length of 3.5mm with a pelletizer. Then, put the pellets into the injection machine, the temperature is 260°C, and the injection pressure is 93kg / cm 2 , The injection time is 2.5 seconds, the holding time is 5.0 seconds, and the injection is made into a standard flame-retardant sample strip of 30×10×3.2mm for testing.

[0015] The invention is tested by the General Standard Technical Service Co., Ltd., and does not contain hexavalent chromium, polyoxybiphenyl, polybromin...

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PUM

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Abstract

The invention relates to a magnetic particle material and its making method, and its formula in weight percent: magnetic powder 40-75%, nylon 18-45%, flame retardant 5-12%, and lubricant EBS 0.5-4.5%. This new permanent magnet material has excellent magnetic property, and a flame-retardant grade at grade FV-0 and the flame retardant adopts an environmental protection flame retardant according with the environmental protection requirement, and it is mainly used in magnetic regulating pieces in TV kinescopes.

Description

technical field [0001] The invention belongs to permanent magnet materials, in particular to a method for manufacturing plastic bonded magnetic particles. Background technique [0002] Plastic bonded permanent magnet material is a kind of magnetic material made of permanent magnetic powder and plastic binder. The common ones are ferrite permanent magnet material, alnico permanent magnet material and neodymium iron boron permanent magnet material. The main materials used to make the kinescope adjusting plate are ferrite permanent magnet and alnico permanent magnet material. The regulator has a flame retardant safety index requirement for the material, which must reach the FV-0 level. For this reason, only by adding a flame retardant to meet its requirements. The existing technology uses halogen and antimony materials as flame retardants. Its cost is low, and its flame retardant effect is ideal, but halogen flame retardants such as polybrominated diphenyl ether and its flame-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/032H01F41/02
Inventor 陈雪奇何建明蔡文贵
Owner MAGNETIC MATERIAL FACTORY MEIZHOU CITY GUANGDONG PROV
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