Ferrite injection molding granule and preparation method thereof

A technology of injection molding and granular materials, which is applied in the direction of magnetism of inorganic materials, can solve the problems of poor temperature resistance and low strength, and achieve the effects of good heat resistance, high mechanical strength and high magnetic properties

Active Publication Date: 2012-04-11
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the disadvantages of poor temperature resistance or low strength of the existing ferrite pellets, and aims to provide a high-strength, high-temperature-resistant ferrite injection molding p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-strength, high-temperature-resistant ferrite injection-molded granular material is prepared by the following method:

[0022] (1) Raw materials: KH550 silane coupling agent, ferrite magnetic powder, binder (a mixture of PPS and PA6 in proportions of 60wt% and 40wt%), and lubricant (high temperature resistant lubricant PETS) are 0.5wt% respectively , 90wt%, 9.4wt%, 0.1wt%.

[0023] (2) Add 500g of water to the magnetic powder, then mix in a high-speed mixer for 5-10 minutes.

[0024] (3) Dissolve the coupling agent with ethanol or acetone, then add ferrite magnetic powder and mix evenly, then dry at 120°C to obtain surface-modified ferrite magnetic powder;

[0025] (4) Put the surface-modified ferrite magnetic powder, binder and other additives into a high-speed mixer and mix evenly to obtain a mixture of magnetic powder and binder;

[0026] (5) Add the lubricant to the high-speed mixer and mix the mixture of magnetic powder and binder evenly, and the mixing tem...

Embodiment 2

[0031] The other operations of this example are the same as Example 1, the difference is that in step (1): the ratios of KH550 silane coupling agent, ferrite magnetic powder, binder, and lubricant are 0.5wt%, 85wt%, and 14wt, respectively %, 0.5wt%; in step (2): drying at 90°C; in step (5): the mixing temperature is 90°C.

[0032] The magnet sample that present embodiment obtains detects, and magnetic energy product (BH) max reaches 14.2kJ / m 3 , the tensile strength reaches 65.1Pa, the bending strength reaches 155.2MPa, and the heat distortion temperature reaches above 185°C.

Embodiment 3

[0034] The other operations of this example are the same as Example 1, except that the proportions of KH550 silane coupling agent, ferrite magnetic powder, binder, and lubricant are 0.3wt%, 87.3wt%, 12wt%, and 0.4wt% respectively ; In step (2): drying at 90°C.

[0035] The magnet sample that present embodiment obtains detects, and magnetic energy product (BH) max reaches 14.8kJ / m 3 , the tensile strength reaches 64.3Pa, the bending strength reaches 153.1MPa, and the heat distortion temperature reaches above 185°C.

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Abstract

The invention belongs to the field of magnetic material and specifically relates to a ferrite injection molding granule, which contains the following constituents in percentage by weight: 85-92% of ferrite magnetic powder, 0.3-0.5% of coupling agent, 7-14% of bonder and 0.1-0.5% of lubricant, wherein the bonder is mixture of PPS (polyphenylene sulfite) and PA (polyamide). The invention also provides a preparation method of the ferrite injection molding granule, which comprises a step of modifying magnetic powder surface, a step of mixing glue with magnetic powder, a step of lubricating and a step of mixing and pelletizing, wherein the step of lubricating is an individual step, namely, lubricant is added after the glue mixing process is finished and the magnetic powder has formed uniform mixture along with the bonder. The ferrite granule prepared by the invention has the characteristics of ferrite/PPS granule and ferrite/PA granule, and has good high temperature resistance and better mechanical property.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a high-strength, high-temperature-resistant ferrite injection molding granular material and a preparation method thereof. Background technique [0002] The magnet prepared by mixing and granulating the magnetic powder, polymer binder, and additives in a certain proportion, and then injecting the pellets through an injection molding machine at an appropriate temperature is called an injection magnet. As an important branch of bonded magnets, this type of magnet has the advantages of high dimensional accuracy, good mechanical properties, magnetization with complex shapes and multi-pole orientations, integral injection molding with other parts, and easy large-scale production. Widely used in household appliances, automobiles, communication equipment, testing instruments, computers, office equipment and other fields. In recent years, with the rapid development of China'...

Claims

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Application Information

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IPC IPC(8): C04B35/26H01F1/10H01F1/34
Inventor 李玉平李佳玉马友军陈军金志洪包大新
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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