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Injection-molded permanent magnetic ferrite magnet and preparation method thereof

A permanent magnet ferrite and magnet technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of easy cracking of magnets, engine overheating, coolant pump failure, etc., and achieves low production cost, injection molding The effect of low temperature and low mold requirements

Active Publication Date: 2020-05-29
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the problems that the existing water pump rotor magnets are easy to crack and lead to the failure of the coolant pump and the overheating of the engine, the present invention provides an injection molding machine with high mechanical strength, long working life, high temperature resistance, acid and alkali resistance, solvent resistance and excellent magnetic properties. Permanent ferrite magnet

Method used

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  • Injection-molded permanent magnetic ferrite magnet and preparation method thereof
  • Injection-molded permanent magnetic ferrite magnet and preparation method thereof
  • Injection-molded permanent magnetic ferrite magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] An injection-molded permanent ferrite magnet, made according to the formula shown in Table 1: 500kg of Sr permanent ferrite magnetic powder A, 110kg of polyphenylene sulfide I powder, 3kg of KH550 silane coupling agent, 2kg of polyphenylene sulfide Dispersant for sulfide, 4kg of mixed toughening agent P2#. Among them, the average particle size of Sr permanent ferrite magnetic powder A (Fischer gas permeability method) is 1.53 μm, and the melt viscosity of polyphenylene sulfide I powder (310°C, 1200S -1 ) is 33Pa.S.

[0068] Its preparation method is as follows:

[0069] (1) Magnetic powder surface coupling treatment: 500kg of Sr permanent magnet ferrite magnetic powder A is placed in a high-speed powder mixing tank, and 3kg of KH550 silane coupling agent (1:10 dissolved in isopropanol) is added, mixed at 100°C powder for 50 minutes, and the moisture content of the magnetic powder is controlled within 1000ppm;

[0070] (2) Add 110kg of polyphenylene sulfide I powder a...

Embodiment 2

[0075] An injection-molded permanent ferrite magnet, made according to the formula shown in Table 1: 500kg of Sr permanent ferrite magnetic powder B, 100kg of polyphenylene sulfide II powder, 3kg of KH560 silane coupling agent, 3kg of polyphenylene sulfide II powder Dispersant for sulfide, 3.5kg of mixed toughening agent P3#. Among them, the average particle size of Sr permanent ferrite magnetic powder B (Fischer gas permeability method) is 1.76 μm, and the melt viscosity (310°C, 1200S-1) of polyphenylene sulfide II powder is 47Pa.S.

[0076] Its preparation method is as follows:

[0077] (1) Magnetic powder surface coupling treatment: 500kg of Sr permanent magnet ferrite magnetic powder B is placed in a high-speed powder mixing tank, and 3kg of KH560 silane coupling agent (1:10 ratio is dissolved in isopropanol) is added. Mix the powder at temperature for 50 minutes, and control the moisture content of the magnetic powder within 1000ppm;

[0078] (2) Add 100kg of polyphenyl...

Embodiment 3

[0083] An injection-molded permanent ferrite magnet, made according to the formula shown in Table 1: 500kg of Sr permanent ferrite magnetic powder B, 105kg of polyphenylene sulfide III powder, 4kg of KH550 silane coupling agent, 3kg of polyphenylene sulfide III powder Dispersant for thioether, 3kg of silicon-based toughening agent. Among them, the average particle size of Sr permanent ferrite magnetic powder B (Fischer gas permeability method) is 1.76 μm, and the melt viscosity (310°C, 1200S-1) of polyphenylene sulfide III powder is 25Pa.S.

[0084] Its preparation method is as follows:

[0085] (1) Magnetic powder surface coupling treatment: 500kg of Sr permanent magnet ferrite magnetic powder B is placed in a high-speed powder mixing tank, and 4kg of KH550 silane coupling agent (1:10 ratio is dissolved in isopropanol) is added. Mix the powder at temperature for 50 minutes, and control the moisture content of the magnetic powder within 1000ppm;

[0086](2) Add 105kg of poly...

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Abstract

The invention belongs to the technical field of injection-molded permanent magnet material production, provides an injection-molded permanent magnetic ferrite magnet and a preparation method thereof and in order to solve the problems of the failure of a cooling liquid pump and the overheat of an engine which are due to the fact that an existing water pump rotor magnet is prone to cracking. The injection-molded permanent magnetic ferrite magnet is prepared from the following components in percentage by weight: 75-90% of permanent magnetic ferrite magnetic powder; 9-22% of polyphenylene sulfide;0.2-2.0% of a coupling agent; 0.2-1.5% of a toughening enhancer; and 0.2-1.0% of a dispersing agent. The melt viscosity of the polyphenylene sulfide is controlled to be 22-75Pa. S. The injection-molded permanent magnetic ferrite magnet has high tensile strength and bending strength, and can be widely applied to the fields of electronic water pump rotors, automobile motor rotors, high-end household electrical appliance motor rotors, induction magnetic rings and the like. In a preparation process, the method has the advantages of good magnetic powder flowability, low injection molding temperature, low energy consumption, low mold requirement, good product appearance and low production cost.

Description

technical field [0001] The invention relates to the technical field of injection molding permanent magnet material production, in particular to an injection molding permanent ferrite magnet and a preparation method thereof. Background technique [0002] In recent years, with the vigorous development of turbocharged vehicles and the continuous popularization of new energy vehicles, micro electronic water pumps used as turbochargers and battery pack liquid cooling systems have developed rapidly. At present, the micro electronic water pump mainly adopts a permanent magnet DC motor, and the motor rotor adopts an injection-molded magnet with high dimensional accuracy, high mechanical strength, long working life, and high temperature resistance (above 180°C). [0003] Injection molding magnet is a polymer-based composite permanent magnet material made by uniformly mixing magnetic powder (ferrite, NdFeB, SmFeN, SmCo, etc.) with nylon, polyphenylene sulfide and other binders, granul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/113H01F41/02
CPCH01F1/113H01F41/0266
Inventor 金志洪胡江平何国栋李军华丁卫卫
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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