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Preparation of softly magnetic granules for injection molding

A technology of injection molding and pellets, applied in the field of preparation of soft magnetic pellets, can solve the problems of complex process and low production efficiency.

Inactive Publication Date: 2016-08-24
ZHEJIANG LICHUANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the existing soft magnetic molding technology such as complex process and low production efficiency, and provide a soft magnetic granular material for injection molding and its preparation method

Method used

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  • Preparation of softly magnetic granules for injection molding
  • Preparation of softly magnetic granules for injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 11.25g of silane coupling agent KH-550 and dissolve it in an appropriate amount of absolute ethanol. After it is completely dissolved, add 4.5kg of iron powder. After stirring evenly, dry it in vacuum at 60°C for 4-6 hours, cool, pulverize, and sieve Separate the coupled iron powder.

[0016] Take 0.5kg of PA66, add 0.2% lubricant and 5% elastomer, mix evenly, and premix with 4.5kg of the above-mentioned coupled iron powder to obtain a premix.

[0017] The above premixed materials were mixed and granulated by a twin-screw extruder to obtain iron powder / PA66 injection molding pellets. The temperature of each section of the extruder was set at 245°C, 250°C, 260°C, and 245°C.

[0018] The above pellets were injection molded to obtain samples. According to relevant test standards, the measured magnetic permeability of the sample is 18, the saturation magnetization is 18.3mT, and the core loss Pcv is 32.3kW / m 3 .

Embodiment 2

[0020] Take 22.75g of titanate coupling agent HY-201 and dissolve it in an appropriate amount of absolute ethanol. After it is completely dissolved, add 4.55kg of iron-nickel alloy powder. After stirring evenly, dry it in vacuum at 80°C for 4 hours, then cool and pulverize and sieving to obtain coupled iron-nickel alloy powder.

[0021] Take 0.45kg of PPS, add 0.1% lubricant and 4% elastomer, mix evenly, and mix with 4.55kg of the above-mentioned coupled iron-nickel alloy powder to obtain a premix.

[0022] The above premixed materials were kneaded and granulated by a twin-screw extruder to obtain iron-nickel alloy / PPS injection molding pellets. The temperature of each section of the extruder was set at 245°C, 250°C, 260°C, and 245°C.

[0023] The above pellets were injection molded to obtain samples. According to relevant test standards, the measured magnetic permeability of the sample is 27, the saturation magnetization is 22.5mT, and the magnetic core loss is Pcv45.6kW / m ...

Embodiment 3

[0025] Take 12.75g of silane coupling agent KH-560 and dissolve it in an appropriate amount of absolute ethanol. After it is completely dissolved, add it to 4.25kg of manganese zinc ferrite. Grinding and sieving to obtain coupled manganese zinc ferrite powder.

[0026] Take 0.75kg of PA6, add 0.3% lubricant and 4% elastomer, mix evenly, and premix with 4.25kg of the above-mentioned coupled manganese zinc ferrite powder to obtain a premix.

[0027] The above premixed materials were mixed and processed by a twin-screw extruder to obtain manganese zinc ferrite / PA6 injection molding pellets. The temperature of each section of the extruder was set at 245°C, 250°C, 260°C, and 245°C.

[0028] The above pellets were injection molded to obtain samples. According to the relevant standard test, the measured magnetic permeability of the sample is 14, the saturation magnetization is 18.4mT, and the core loss Pcv is 46.7kW / m 3 .

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Abstract

The invention relates to a method for preparing softly magnetic granules for injection molding. The method comprises the following specific steps: coupling softly magnetic powder by using a proper amount of coupling agent, drying, crushing and screening; mixing the coupled powder and resins according to the formula, and mixing and granulating by virtue of a twin-screw extruder, thereby obtaining the softly magnetic granules for injection molding; and finally, performing injection molding, thereby obtaining the product. Under the condition that the magnetic conductivity requirement is met, compared with the traditional softly magnetic product sintering process, the injection molding production process has the advantages that the production efficiency is high, products of complicated shapes can be produced, the dimensional accuracy of the product is high, the production cost is low, and the like.

Description

technical field [0001] The invention relates to the field of injection molding of magnetic materials, in particular to the preparation of soft magnetic granular materials for injection molding. Background technique [0002] With the development of the electronics industry, people are exposed to more and more radiation sources in daily life, ranging from industrial equipment to mobile phones, computers and other electronic products. Therefore, the demand for soft magnetic products is increasing. However, with the gradual miniaturization and integration of electronic components, the requirements for the electromagnetic properties, mechanical properties and geometrical dimensions of the devices are getting higher and higher. The production of traditional soft magnetic products is through sintering, that is, the powder and the binder are mixed first to obtain a premixed material, and after sieving, the blank is formed by cold pressing or hot pressing. The product is obtained by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L77/06C08L77/02C08L27/16C08L23/12C08L81/02C08L23/08C08L53/02C08K9/06C08K9/04C08K3/08C08K3/22B29C47/92B29B9/06B29C45/76B29C48/92
Inventor 赵宁宁董玉欣王帆王鑫王勇杰蔡伟乔梁郑精武车声雷姜力强
Owner ZHEJIANG LICHUANG NEW MATERIAL CO LTD
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