Rubber-mixed magnetic powder and preparation method thereof

A technology of magnetic powder and rubber mixing, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., and can solve problems such as low magnet density

Active Publication Date: 2019-06-11
MAGNEQUENCH (TIANJIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of mixed rubber magnetic powder and its preparation method, to solve the problem that the density of the magnet made by using the existing mixed rubber magnetic powder is low

Method used

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  • Rubber-mixed magnetic powder and preparation method thereof
  • Rubber-mixed magnetic powder and preparation method thereof

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preparation example Construction

[0034] Another aspect of the present application provides a method for preparing the above rubber-mixed magnetic powder, the preparation method comprising: performing a first mixing process on the first magnetic powder, a binder and a curing agent to obtain a first intermediate product; The intermediate product and the second magnetic powder are subjected to a second mixing process to obtain a rubber-mixed magnetic powder, and the amount and particle size of the first magnetic powder are larger than those of the second magnetic powder.

[0035]In the above rubber-mixed magnetic powder provided by this application, since the amount and particle size of the first magnetic powder are larger than that of the second magnetic powder, during the mixing process, under the action of the binder, the second magnetic powder will be coated on the first magnetic powder or the second magnetic powder. The surface of agglomerates formed by magnetic powder. This enables the second magnetic powd...

Embodiment 1

[0039] 13.264g solid epoxy resin NPES-302 and 5.306g liquid epoxy resin Epon828 and 0.557g dicyandiamide curing agent are dissolved in acetone solution to obtain a mixed solution; drop into the first 884.266g magnetic powder (MQP- 14-12, 198μm), after stirring evenly, heat at 65°C, and condense under vacuum conditions, so that acetone can be volatilized and recovered to obtain the first magnetic powder agglomerate, the weight ratio of solid epoxy resin to liquid epoxy resin It is 2.5:1.

[0040] The above-mentioned first magnetic powder agglomerates and 95.556 g of the second magnetic powder (MQFP, 5 μm) were uniformly mixed to prepare fluid mixed rubber powder particles. After passing the above-mentioned mixed rubber powder particles through a 60-mesh (250 μm) sieve, and 1.051 g of zinc stearate (lubricant), the mixed rubber magnetic powder that can be used directly is formed, wherein the weight ratio of the first magnetic powder and the second magnetic powder is It is 9.25:...

Embodiment 2

[0047] Dissolve 16.882g of solid epoxy resin NPES-302 and 1.688g of liquid 1H,1H,2H,2H-perfluoroheptadecanetrimethyloxysilane and 0.557g of dicyandiamide curing agent in an acetone solution to obtain a mixed solution; Put 884.266g of the first magnetic powder (MQP-14-12, 198μm) into the above mixed solution, stir evenly, heat at 60°C, and condense under vacuum conditions to make the acetone volatilize and recover, and obtain the first magnetic powder agglomeration The weight ratio of solid epoxy resin to liquid binder is 10:1.

[0048] The above-mentioned first magnetic powder agglomerates and 95.556 g of the second magnetic powder (MQFP, 5 μm) were uniformly mixed to prepare fluid rubber-mixed magnetic powder particles. After passing the above-mentioned mixed rubber powder particles through a 60-mesh (250 μm) sieve, and 1.051 g of zinc stearate (lubricant), the mixed rubber magnetic powder that can be used directly is formed, wherein the weight ratio of the first magnetic pow...

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Abstract

The invention provides rubber-mixed magnetic powder and a preparation method thereof. The rubber-mixed magnetic powder comprises first magnetic powder with particle size ranging from 5 microns to 420microns, second magnetic powder with particle size ranging from 0.05 micron to 75 microns and a binder, wherein the dose and particle size of the first magnetic powder are both greater than those of the second magnetic powder. The rubber-mixed magnetic powder is prepared from the first magnetic powder and the second magnetic powder with specific particle sizes and the binder. In the preparation process, the second magnetic powder can be distributed on surfaces of the first magnetic powder or surfaces of aggregates of the first magnetic powder, so that a gap between the adjacent first magneticpowder or between the adjacent aggregates of the first magnetic powder can be filled up. By the adoption of the first magnetic powder and the second magnetic powder with the specific particle sizes, the density of a magnet can be substantially improved under the conditions of not lowering the mechanical strength of the magnet and not increasing the pressing pressure of the magnet.

Description

technical field [0001] The invention relates to the field of bonded magnetic powder, in particular to a rubber-mixed magnetic powder and a preparation method thereof. Background technique [0002] The current technique for pressing magnets includes (1) preparing mixed powder and (2) pressing magnets with mixed powder. In step (1), the magnetic powder and the epoxy resin are mixed in a weight ratio of 100: (1.5-4) by means of liquid mixing or thermal mixing to form mixed powder. The mixed powder is crushed into proper particles and mixed with lubricant, then it can be used to press the magnet. In the step (2), the mixing powder is filled into a mold, and then an appropriate pressure is applied, compressed and molded, and then taken out from the mold. At this time, the mechanical strength of the molded product is very low, and it needs to be cured at 150 to 200°C to form a magnet with mechanical strength. After the magnet is polished and coated (not necessary), it becomes t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
Inventor 赵巍韩智三王双成江峰顾鸣岐
Owner MAGNEQUENCH (TIANJIN) CO LTD
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