A kind of flexible magnet without dropping magnetic powder and preparation method thereof

A flexible magnet and magnetic powder technology, applied in the direction of magnetic objects, magnets, inorganic materials, etc., can solve the problems of magnetic powder loss of flexible bonded magnets, affecting product dimensional accuracy, complex manufacturing process, etc., to increase surface finish and solve the problem of magnetic powder removal , the effect of good toughness

Active Publication Date: 2016-03-16
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of this method of coupling magnetic powder is limited. In actual use, it is often necessary to coat a layer of resin on the surface or fracture of the magnet, which makes the manufacturing process complicated and difficult to process, and also affects the size of the product. precision
At present, there is no specific technical solution to solve the problem of magnetic powder falling off flexible bonded magnets in China

Method used

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  • A kind of flexible magnet without dropping magnetic powder and preparation method thereof
  • A kind of flexible magnet without dropping magnetic powder and preparation method thereof
  • A kind of flexible magnet without dropping magnetic powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Prepare the magnetic powder mixture according to the following formula and conduct experiments:

[0032] Flaky NdFeB magnetic powder (sheet diameter 45um, thickness-to-diameter ratio 1:16) 85wt%

[0033] Polyurethane 8.5wt%

[0034] Polyethylene 3.5wt%

[0035] Silicone oil 1.4wt%

[0036] Epoxidized soybean oil 1.3wt%

[0037] Silica powder (Fisher particle size 0.6um) 0.3wt%

[0038]The above-mentioned components are mixed evenly with a high-speed mixer (high-speed mixer GH-10DY type, Beijing Plastic Machinery Factory), and then mixed with an open mill (open mill XK-160, Wenzhou Eurasia Rubber and Plastic Machinery Co., Ltd.) The obtained mixture was mixed fully and evenly, and finally a magnetic sheet with a thickness of 1.5 mm was made with a calender (calender XY-2-230, Wuxi Wangda Rubber and Plastic Machinery Factory). 2. Determination of magnetic properties, tensile strength and elongation at break of magnetic sheets; flexibility test, salt water resistan...

Embodiment 2

[0045] 1. Prepare the magnetic powder mixture according to the following formula and conduct experiments:

[0046] Flake NdFeB magnetic powder (sheet diameter 60um, thickness-to-diameter ratio 1:35) 91wt%

[0047] Polyurethane 5.9wt%

[0048] Zinc stearate 0.6wt%

[0049] Dioctyl phthalate 1.4wt%

[0050] Epoxidized soybean oil 1.0wt%

[0051] Calcium carbonate powder (Fisher particle size 0.1um) 0.1wt%

[0052] The above-mentioned components are mixed evenly with a high-speed mixer (high-speed mixer GH-10DY type, Beijing Plastic Machinery Factory), and then mixed with an open mill (open mill XK-160, Wenzhou Eurasia Rubber and Plastic Machinery Co., Ltd.) The obtained mixture was mixed fully and evenly, and finally a magnetic sheet with a thickness of 1.5 mm was made with a calender (calender XY-2-230, Wuxi Wangda Rubber and Plastic Machinery Factory).

[0053] 2. Determination of magnetic properties, tensile strength and elongation at break of magnetic sheets; flexibilit...

Embodiment 3

[0056] 1. Prepare the magnetic powder mixture according to the following formula and conduct experiments:

[0057] Flake NdFeN magnetic powder (sheet diameter 5um, thickness-to-diameter ratio 1:10) 88wt%

[0058] Nylon 69.0wt%

[0059] Wax liquid 0.4wt%

[0060] Zinc stearate 1.0wt%

[0061] Epoxidized soybean oil 1.2wt%

[0062] Silicon nitride powder (Fisher particle size 0.1um) 0.1wt%

[0063] Silica powder (Fisher strength 1.0um) 0.3wt%

[0064] The above-mentioned components are mixed evenly with a high-speed mixer (high-speed mixer GH-10DY type, Beijing Plastic Machinery Factory), and then mixed with an open mill (open mill XK-160, Wenzhou Eurasia Rubber and Plastic Machinery Co., Ltd.) The obtained mixture was mixed fully and evenly, and finally a magnetic sheet with a thickness of 1.5 mm was made with a calender (calender XY-2-230, Wuxi Wangda Rubber and Plastic Machinery Factory).

[0065] 2. Determination of magnetic properties, tensile strength and elongation ...

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Abstract

The invention discloses a flexible magnet without magnetic powder falling and a preparation method thereof. The flexible magnet comprises 85-96wt% of magnetic powder, 2.5-12wt% of binder, 0.5-3wt% of processing aid and 0.1-0.5wt% of fillers, wherein the magnetic powder is selected from one ore more of ferrite magnetic powder, lamellar NdFeB magnetic powder and lamellar NdFeN magnetic powder; the binder is selected from one or more of polyurethane, polystyrene, polyethylene, polyamide, polyester and polyimide thermoplastic elastomer; the processing aid comprises a lubricant and / or a plasticizer; and the fillers are selected from one or more of carbon black powder, silica powder, silicon nitride powder, aluminum silicate powder, calcium silicate powder, calcium carbonate powder, basic magnesium carbonate powder, zinc oxide powder and barium sulfate powder. The flexible magnet provided by the invention has favorable toughness, tensile strength and corrosion resistance and cannot give rise to the problem of magnetic powder falling.

Description

technical field [0001] The invention relates to a flexible magnet, in particular to a flexible magnet which does not drop magnetic powder and a method for preparing the flexible magnet. Background technique [0002] Flexible bonded magnets are an important part of permanent magnet materials, which are prepared by calendering by mixing permanent magnet powder with flexible rubber, plastic binders and other additives. Flexible bonded magnets do not deform at room temperature, have high dimensional accuracy, and are convenient for mass-automated production, playing an increasingly important role in modern industry. [0003] Traditional ferrite rubber flexible magnets, due to the fine particle size of ferrite powder, have a strong binding force with rubber adhesives, and ferrite rubber flexible magnets are generally used in flat plate adsorption or low-performance toy motors. The problem of falling magnetic powder is not obvious. In order to meet the needs of modern industry, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/09H01F7/00H01F41/02
Inventor 蔡道炎敖学如郭晓燕饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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