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High-temperature flexible rubber bound magnet and the preparing method thereof

A bonded magnet, high-temperature flexible technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as the failure of the motor to work normally, the inability to meet the use requirements, and the decline of the magnetic and physical and mechanical properties of the magnet.

Inactive Publication Date: 2009-03-04
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, flexible rubber magnets also have their own shortcomings: low magnetic properties, and the use temperature should not be too high. The temperature used by the bonded magnets on the market is below 120°C, otherwise it will decompose and the magnetic properties and physical properties of the magnet will be reduced. The mechanical properties decrease. Generally speaking, when the temperature rises to 80°C, the magnet will become brittle. When the temperature rises to 100°C, the magnet will almost lose its flexibility and then become rigid.
In some specific applications, high-temperature rubber magnets are urgently needed to make up for the shortcomings of the current rubber bonded magnets. For example, anisotropic calendered rubber magnets are mainly used in motor magnetic strips. The quality is not only required for magnetic properties, but also for products. There are high requirements for dimensional accuracy and consistency, and deformation at high temperature is obviously a relatively large defect
High-quality motor magnetic composite materials have higher requirements on the dimensional accuracy of the magnetic strip. It is even hoped that the motor can maintain the dimensional accuracy under high-speed operation to high temperature without major changes, so as to avoid jamming and the motor cannot work normally.
However, rubber magnets are materials that expand with heat and contract with cold. Ordinary flexible rubber magnets have a large amount of deformation when they exceed 80°C, which cannot meet the requirements of use. At present, the means to deal with high-temperature deformation is often that when the temperature rises above 80°C, the machine will stop. will be forced to shut down to cool down

Method used

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  • High-temperature flexible rubber bound magnet and the preparing method thereof
  • High-temperature flexible rubber bound magnet and the preparing method thereof
  • High-temperature flexible rubber bound magnet and the preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] BMXF-4b ferrite powder 200g, fluorine rubber 20g, vulcanizing agent 0.4g, plasticizer 1g, reinforcing agent 0.5g, vulcanization assistant 0.25g, or lubricant 0.25g.

[0053] Process flow:

[0054] The magnetic powder is subjected to coupling treatment and dried in an oven at 45°C for later use; the binder is plasticized in accordance with the conventional process to make it meet the standard physical and mechanical properties; compounding agents are added to the binder and mixed , After cooling, add the vulcanizing agent to continue mixing, coat the mixture of the refined binder, compounding agent and vulcanizing agent on a roller of the calender, and then add the coupled magnetism between the rollers of the calender The powder is mixed together and kneaded, and the temperature of the roller is controlled between 40~60℃; after the binder and the magnetic powder are evenly mixed, they are finished on a finishing machine to obtain a rubber magnetic sheet; The finished magneti...

Embodiment 2

[0058] BMXF-4b ferrite powder 200g, silicone rubber 6g, nitrile rubber 14g, vulcanizing agent 0.4g, plasticizer 1g, reinforcing agent 0.5g, vulcanization assistant 0.3g, lubricant 0.2g.

[0059] Process flow:

[0060] The magnetic powder is subjected to coupling treatment and dried in an oven at 45°C for later use; the silicone rubber and nitrile rubber are respectively masticated according to the conventional process to achieve physical and mechanical properties that meet the standards, and then in the two binders Add the compounding agent to each of them, mix and cool, then add the vulcanizing agent to respectively plasticize and then mix, coat the mixed binder and its compounding agent on a roller of the calender, and then send it to the calender The coupled magnetic powder is added between the rollers and mixed with the binder. The temperature of the roller is controlled between 40~60℃; after the binder and the magnetic powder are evenly mixed, it is carried out on the finishi...

Embodiment 3

[0070] BMXF-4b ferrite powder 200g, silicone rubber 4g, nitrile rubber 16g, vulcanizing agent 0.4g, plasticizer 1g, reinforcing agent 0.5g, vulcanization assistant 0.5g. The flexible bonded magnet was calendered according to the process flow of Example 2, and the test performance is shown in Table 2.

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Abstract

The magnet contains magnetic powder 80-96% mass percent, bonding agent 3-18%, and addition agent in residual amount. The bonding agent is selected from fluororubber or combination rubber of silicon rubber / nitrile butadiene rubber. The method includes steps: mixing bonding agent and addition agent to carry out plastication and pugging; adding magnetic powder with surface treatment by coupling agent, and then carrying out rolling and molding procedures as well as finishing procedure; sulfuration step. Based on high temperature resistant, the disclosed magnet can retain good flexibility, and better magnetism.

Description

Technical field [0001] The invention belongs to the field of bonded permanent magnetic materials, and relates to flexible bonded magnetic materials, specifically high-temperature resistant flexible bonded magnetic materials and a manufacturing method thereof, and is especially suitable for ferrite powder (BaO·6Fe 2 O 3 Or SrO·6Fe 2 O 3 ) It is used as a magnetic powder to prepare calendered and formed high temperature resistant flexible bonded magnets, and it is also suitable for NdFeB, NdFeN, SmCo and other magnetic powders, which can also achieve good results. Background technique [0002] Flexible rubber magnet is an important part of permanent magnet material. It is made of permanent magnet powder mixed with rubber with good flexibility, and directly extruded or calendered into permanent magnet parts of various shapes according to user requirements. The application range of rubber magnets is (BH)m<25(MGOe), and the use temperature t<120℃. At present, flexible rubber mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/113H01F41/00
Inventor 柴立民蒋伟刘小平王文光黄可淼李帅
Owner BGRIMM TECH CO LTD