Environment-friendly halogen-free ferrite composite magnetic material

A composite magnetic material, ferrite magnetic technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of polluted environment, difficult process control, poor magnetic and mechanical properties, etc., to reduce production costs , good magnetic and mechanical properties, and simple process

Inactive Publication Date: 2012-12-19
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of polluted environment, difficult process control, and poor magnetic and mechanical properties in the magnetic composite material technology, the present inv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A binder system of 80-88wt% flake ferrite magnetic powder with an aspect ratio of 2.0-3.2, 10-18wt% propylene-ethylene copolymer and compatibilizer POE-g-GMA (ratio 4:1) Mix well with 2wt% auxiliary additives (including lubricants, antioxidants and heat stabilizers), masticate in a mixer at 100 ° C for 20 minutes, then calender on a calender into sheets, extrude after pelletizing, and obtain environmentally friendly For halogen-free refrigerator seals and door seals, the magnetic energy product of the extruded magnet is above 6-10kJ / m3.

Embodiment 2

[0032] 89wt% flake ferrite magnetic powder with an aspect ratio of 1.5-2, 9wt% propylene-ethylene copolymer and POE-g-MAH (ratio 7:3) binder system and 2wt% auxiliary Agents (including lubricants, antioxidants and heat stabilizers) are subjected to magnetic field anisotropic extrusion after banburying, calendering, and pelletizing to obtain extruded magnets. Extruded magnets have good flexibility and high magnetic properties. The remanence of the magnet is above 0.27T, and the magnetic energy product is above 13kJ / m3. The forming magnetic field is greater than 20000T.

Embodiment 3

[0034] 92wt% flaky ferrite magnetic powder (such as Beikuang magnetic material BMXF-4D), 6wt% ethylene-butylene polymer or acrylic rubber ACM, one of the polyolefin thermoplastic elastomers, 1wt% reinforcing agent white carbon black It is evenly mixed with 1wt% heat stabilizer, and then calendered on an open mill at 130°C to obtain a calendered flexible bonded magnet after the processes of mastication, thinning, lamination and cold rolling. The magnetic energy product of rolling magnets can reach more than 12kJ / m3.

[0035] With the technical solution provided in this specific embodiment, the binder system used is a halogen-free binder, which is an environmentally friendly material, and there is no environmental problem caused by halogens like CPE or PVC, and there is no NBR vulcanization process. Sulfurization and decontamination, the leftovers of the binder can also be recycled, which can effectively reduce the production cost; the process for producing the composite magneti...

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Abstract

The invention provides an environment-friendly halogen-free ferrite composite magnetic material, which comprises a bonding agent and ferrite magnetic powders; the bonding agent comprises at least one of PBE (propylene basic elastomer), TPO (thermoplastic polyolefin elastomer), POE (polyolefin elastomer) or acrylic acid rubber; the ferrite magnetic powders comprise strontium ferrite magnetic powders or barium ferrite magnetic powders, a mass percentage of the strontium ferrite magnetic powders or barium ferrite magnetic powders in raw materials is 50-94 percent, and a diameter-thickness ratio of the strontium ferrite magnetic powders or barium ferrite magnetic powders is (1.0-4.0):1. The adopted bonding agent is a halogen-free bonding agent, belonging to environment-friendly materials, environmental problems caused by halogens such as CPE (chlorinated polyethylene) or PVC (polyvinylchloride) do not exist, sulfide precipitating materials produced by NBR (nitrile butadiene rubber) sulfide process do not exist as well, leftover bits and pieces of the bonding agent can be recycled, and thus the production cost is lowered; and the process for producing the composite magnetic material is simpler, and the magnetic property and the mechanical performance of the produced composite magnetic material are better.

Description

technical field [0001] The invention relates to an environment-friendly halogen-free ferrite composite magnetic material, which belongs to the technical field of magnetic composite materials. Background technique [0002] With the development of electric vehicles, maglev trains, high-performance motors, generators and other technologies, the demand for high-performance magnetic products is increasing, and the requirements for product characteristics are also getting higher and higher. Different from rigid bonded magnets produced by injection molding and molding processes, flexible bonded permanent magnets prepared by calendering and extrusion molding use rubber and plastic as binders, and adopt rubber processing technology, which has high production efficiency and large product freedom. , The size of the product is easy to change and the flexibility is good, which better meets the requirements of the development of micro motors in the direction of small, ultra-thin, high-spe...

Claims

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Application Information

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IPC IPC(8): H01F1/11H01F1/113C09J123/10C09J123/00C09J123/08C09J133/00
Inventor 何双珍阎春山王峰李亚峰
Owner BGRIMM TECH CO LTD
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