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High-temperature flexible rubber bound magnet and preparing method

A bonded magnet, high-temperature flexible technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as the decline of magnetic properties and physical and mechanical properties of magnets, the inability of motors to work properly, and low magnetic properties.

Inactive Publication Date: 2007-03-28
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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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 aid 0.25g, or lubricant 0.25g.

[0053] Process flow:

[0054] Coupling the magnetic powder and drying it in an oven at 45°C for later use; masticating the binder according to the conventional process to make it meet the standard physical and mechanical properties; adding compounding agents to the binder, mixing , cooling, and then add vulcanizing agent to continue mixing, coat the mixture of refined binder, compounding agent and vulcanizing agent on a roller of the calender, and then add coupled magnetic powder, mixed together and kneaded, and the roller temperature is controlled between 40-60°C; after the binder and magnetic powder are kneaded evenly, they are finished on a finishing machine to obtain rubber magnetic sheets; The finished magnetic sheet is cut into 150mm×120mm×2.3mm rubber magnetic sheet, sent to the vulcanizing machine for o...

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 aid 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 masticated according to the conventional process to make them meet the standard physical and mechanical properties, and then the two binders Each compounding agent is added in the mixture, kneaded and cooled, and then the vulcanizing agent is added to masticate and then kneaded separately. The mixed binder and its compounding agent are coated on a roller of the calender, and then fed Add the coupled magnetic powder between the rollers to knead it with the binder. The temperature of the rollers is controlled between 40 and 60°C. Finishing to obtain rubber magnetic sheets; cut the finished magnetic sheets into rubber magnetic shee...

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 aid 0.5g. According to the technical process of Example 2, the flexible bonded magnet was calendered, 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 magnet materials, and relates to a flexible bonded magnetic material, in particular to a high-temperature-resistant flexible bonded magnetic material and a manufacturing method thereof, and is especially suitable for ferrite powder (BaO·6Fe 2 o 3 or SrO·6Fe 2 o 3 ) as magnetic powder to prepare calendered high-temperature-resistant flexible bonded magnets, and is also suitable for NdFeB, NdFeN, SmCo and other magnetic powders, and can also achieve good results. Background technique [0002] Flexible rubber magnets are an important part of permanent magnet materials, which are mixed with permanent magnet powder and flexible rubber, and are directly extruded or calendered into permanent magnet parts of various shapes according to user needs. The application range of the rubber magnet is (BH)m<25(MGOe), and the operating temperature t<120°C. At present, flexible rubber magnets generally use ...

Claims

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Application Information

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Patent Type & Authority Applications(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