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Method for preparing NdFeB/PPS injection moulding particle material

A technology of injection molding and granular materials, which is applied in the directions of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of uneven mixing, easy oxidation of magnetic powder, etc., and achieves the effect of simple preparation method, prevention of oxidation, and improvement of performance.

Inactive Publication Date: 2008-10-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the inhomogeneous mixing of NdFeB magnetic powder and powdery PPS resin in the prior art and the inadequacy of easy oxidation of the magnetic powder, to provide a method for manufacturing high-performance NdFeB / PPS injection molding pellets, to achieve The purpose of mixing evenly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 100g of titanate coupling agent NXT102 and dissolve it with absolute ethanol, then add 20Kg of quick-quenched NdFeB magnetic powder. The reagents are fully mixed, then fully dried at 50°C, cooled to room temperature, taken out, ground, crushed, and sieved to obtain coupled quick-quenched NdFeB magnetic powder.

[0029] Dissolve 100.5g polyvinyl alcohol in deionized water to form a colorless and transparent solution, then add the coupling quick-quenching NdFeB magnetic powder and 2412g powdered PPS resin in the previous step, and stir continuously under ventilated conditions to make the magnetic powder, PPS resin and poly Vinyl alcohol was mixed thoroughly, then fully dried at 80°C, cooled to room temperature, taken out, ground, crushed, and sieved to obtain pre-granulated materials with a size of 5mm or less.

[0030] In the third step, the above-mentioned pre-compounded pellets are kneaded by a disc extruder, extruded and pelletized to obtain NdFeB / PPS injection m...

Embodiment 2

[0033] Embodiment 2: comparative example

[0034] Take 100g of titanate coupling agent NXT102 and dissolve it with absolute ethanol, then add 20Kg of quick-quenched NdFeB magnetic powder. The reagents are fully mixed, then fully dried at 50°C, cooled to room temperature, taken out, ground, crushed, and sieved to obtain coupled quick-quenched NdFeB magnetic powder.

[0035] Combine the quick-quenched NdFeB magnetic powder coupled in the previous step and 2412g powdered PPS resin through a disc extruder for mixing, extrusion and pelletization to obtain NdFeB / PPS injection molding pellets. According to the operation of the third step of Example 1, samples were obtained by injection molding to obtain a cylindrical standard part and its magnetic properties were tested. The results are shown in Table 2.

Embodiment 3

[0036] Embodiment 3: comparative example

[0037] Mix 20Kg of non-coupling fast-quenched NdFeB magnetic powder and 2400g of powdered PPS resin, knead through a disc extruder, extrude and pelletize to obtain NdFeB / PPS injection molding pellets. According to the operation of the third step of Example 1, samples were obtained by injection molding to obtain a cylindrical standard part and its magnetic properties were tested. The results are shown in Table 2.

[0038] Embodiments 2 to 3 use rapidly quenched NdFeB isotropic magnetic powder.

[0039] Table 2 Magnetic properties of NdFeB / PPS composites

[0040] Br, Gs

[0041]It can be seen from Tables 1 and 2 that the magnetic properties of the samples in Example 1 did not change much, and the properties of the three batches A, B, and C obtained at random were consistent, which also indicated that the uniformity and consistency of the granules were very good. From the comparison results of Examples 1 and 2, the magneti...

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Abstract

The present invention relates to a method for producing a high-performance NdFeB / PPS injection molded grain material, which comprises the following steps: dissolving 0.5-2 parts (by weight) of coupling agent in alcohol, adding 100 parts (by weight) of NdFeB magnetic powder, mixing, drying at 40-60 DEG C, grinding and crushing, and then sieving, to obtain coupled NdFeB magnetic powder; dissolving 0.5-2 parts (by weight) of polyvinyl alcohol in deionized water to form clear solution, adding the coupled NdFeB magnetic powder and PPS resin at a certain proportion into the solution, mixing, and drying thoroughly, grinding and crushing, and sieving the dry compound into grains; compounding the grain material, and then cutting, to obtain the NdFeB / PPS injection molded grain material. The NdFeB / PPS injection molded grain material produced doesn't have the phenomenon of separation between NdFeB magnetic powder and PPS resin in the compounding process, can prevent oxidation of the magnetic powder at high temperature, and therefore greatly improves the performance of the injection molded grain material; the producing method is simple and easy to operate.

Description

(1) Technical field [0001] The invention relates to a preparation method of high-performance NdFeB / PPS injection molding granular material, belonging to the field of composite magnetic material processing. (2) Background technology [0002] Injection molding neodymium-iron-boron (NdFeB) composite magnet is made by mixing NdFeB magnetic powder prepared by quick quenching method or HDDR method with polymer materials, extruding and cutting pellets to prepare pellets, and then preparing them into various final sizes through injection molding. and shapes of composite magnets. Injection-molded neodymium-iron-boron (NdFeB) composite magnets have the advantages of excellent magnetic properties, high dimensional accuracy, suitable for mass production, easy molding of complex-shaped magnets, and good mechanical properties. They meet the requirements of "light, thin, short, The development trend of "small" is widely used in household appliances, automobiles, communication equipment, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/06
Inventor 姜力强乔梁郑精武盛嘉伟
Owner ZHEJIANG UNIV OF TECH
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