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Composite flexible magnetic strip and preparation method thereof

A flexible magnetic strip and flexible technology, applied in the manufacture of inductors/transformers/magnets, magnets, magnetic materials, etc., can solve the problems of protective jacket creases, NdFeB magnetic powder corrosion, poor thermal shrinkage temperature control, etc. Can be super strong, long service life, good-looking effect

Inactive Publication Date: 2016-08-10
安吉司润磁性材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the materials of the protective cover and the rubber magnetic body are not formed synchronously, the two materials are not tightly attached to each other. On the one hand, after the flexible magnetic strip is bent, the rubber magnetic body and the protective cover are bent. Small gaps will appear after folding and deformation, and irreversible creases will appear on the protective sheath after deformation, which will affect the appearance; on the other hand, air will enter the gaps at the creases, which will still oxidize the NdFeB magnetic powder after a long time slowly rust
In addition, both ends of the flexible magnetic strip are not completely closed, and the section of the rare earth rubber magnetic strip can be seen. The NdFeB magnetic powder is still exposed at the section, which is clearly visible. Friction can cause the magnetic powder to fall off, so it is a place that is easy to rust
In addition, the protective cover and the rubber magnetic body are put into the protective cover and then heat-shrunk the protective cover. The combination between the two has not reached a tight and difficult to peel off state. prone to displacement
Due to poor control of the heat shrinkage temperature, when a good thermal bond cannot be achieved between the protective cover and the rubber magnetic body, the rubber magnetic body may even slip out of the protective cover

Method used

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  • Composite flexible magnetic strip and preparation method thereof
  • Composite flexible magnetic strip and preparation method thereof
  • Composite flexible magnetic strip and preparation method thereof

Examples

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Embodiment Construction

[0021] Case 1.

[0022] see Figure 1 to Figure 3 , using NdFeB magnetic powder 90%wt, rubber 9%wt, coupling agent and other additives 1%wt, crushed after mixing to make particles of uniform size. Put the granules into the rubber extruder, extrude them through a die with 13.8*3.5 arcs at both ends, and make a rare earth magnetic strip of the corresponding size, that is, the rubber magnetic body 1, and print the logo on the surface of the rubber magnetic body 1 through the printing wheel After the information is formed, a product information printing coating 2 or a product information display interlayer is formed, and then a 0.2mm thick thermoplastic flexible elastic layer 3 is extruded on the surface of the rubber magnetic body 1, and finally a 14.2mm wide and 3.9mm thick arc at both ends is obtained. The flexible rare earth magnetic strip, the cross-sectional shape see image 3 . Then, after cutting the length according to the specification, injection molding is performed ...

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Abstract

A composite flexible magnetic strip and a preparation method thereof, comprising a rubber magnetic body, a flexible elastic layer, and a soft head; the rubber magnetic body is used as a skeleton, and the periphery of the skeleton length direction is covered with a flexible elastic layer, and the flexible elastic layer and the rubber magnetic body They are tightly combined; at both ends of the rubber magnetic body, a head is provided, and the head is tightly combined with the flexible elastic layer to form a closed state; the thickness of the flexible elastic layer is between 0.03mm and 1mm. Due to the way of composite extrusion, the flexible elastic layer and the rubber magnetic body are closely combined in structure, there is no gap between them, and air will not enter to cause rust, and the two are difficult to peel off and delaminate. Both the flexible elastic layer and the flexible elastic layer have good flexibility, and will not be deformed or creasing. The two ends of the rubber magnetic body are provided with sealing heads that are tightly combined with the flexible elastic layer to completely cover the cross section, so that the rubber magnetic body is completely isolated from the external environment, and the rubber magnetic body is better protected.

Description

technical field [0001] The invention relates to a composite flexible magnetic strip and a preparation method thereof. Background technique [0002] With the wide application of rubber magnetic bodies, flexible rare earth permanent magnets are favored because of their high magnetic properties. However, due to the coarse particles and uneven shape of the rare earth magnetic powder, the flexibility of the prepared rubber magnetic body is much lower than that of the rubber ferrite magnet. In addition, the specific surface area of ​​the rare earth magnetic powder with large particles is small, and the bonding strength with the rubber binder is average, and the phenomenon of powder falling is very easy to occur. Especially when NdFeB rare earth magnetic powder is used, it not only loses the powder seriously, but also is prone to rust. It will rust quickly in a humid environment, and then accelerate the aging of the rubber magnetic body and break. [0003] Chinese patent "ZL 2010...

Claims

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Application Information

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IPC IPC(8): H01F7/02H01F13/00H01F1/057H01F41/02A61N2/06
CPCH01F7/0221A61N2/06H01F1/0575H01F13/003H01F41/0266
Inventor 王文光李帅柴立民李光其
Owner 安吉司润磁性材料股份有限公司
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