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Rubber magnetic strip used under low temperature and preparation method thereof

A rubber magnetic strip, low temperature technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of containing halogen, easy to embrittlement and fracture, and achieve excellent aging resistance, good chemical resistance, The effect of improving the magnetic properties

Active Publication Date: 2014-02-12
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the shortcomings of existing refrigerator door seal magnetic strips which are easy to be brittle and broken in low temperature environment and contain halogen, and provides a low-temperature rubber magnetic strip which does not contain halogen and is resistant to low temperature.

Method used

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  • Rubber magnetic strip used under low temperature and preparation method thereof
  • Rubber magnetic strip used under low temperature and preparation method thereof
  • Rubber magnetic strip used under low temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Weigh an appropriate amount of plasticizer, coupling agent and ethanol into the high-speed mixer, mix in a closed manner and heat up to 70-110°C to reach an atomized state, then add ferrite magnetic powder and mix evenly, take it out after cooling The mixture is dried to remove ethanol to obtain pretreated magnetic powder. Among them, the plasticizer is dibutyl phthalate, the coupling agent is KH550, and the ferrite is barium ferrite. The contents are shown in Table 1 and Table 2. The ethanol content is twice the plasticizer content.

[0025] 2) Weigh an appropriate amount of ethylene-propylene rubber, heat stabilizer and lubricant, mix them with the pretreated magnetic powder and put them into the mixer for 2 hours. Among them, the ethylene-propylene rubber is binary ethylene-propylene rubber, the heat stabilizer is calcium 2-ethylhexanoate, and the lubricant is zinc stearate. The contents are shown in Table 1 and Table 2.

[0026] 3) Pulverize the kneaded mix...

Embodiment 2

[0030] 1) Weigh an appropriate amount of plasticizer, coupling agent and ethanol into the high-speed mixer, mix in a closed manner and heat up to 70-110°C to reach an atomized state, then add ferrite magnetic powder and mix evenly, take it out after cooling The mixture is dried to remove ethanol to obtain pretreated magnetic powder. Among them, the plasticizer is dioctyl phthalate, the coupling agent is KH560, and the ferrite is strontium ferrite. The contents are shown in Table 1 and Table 2. The ethanol content is three times the plasticizer content.

[0031] 2) Weigh an appropriate amount of ethylene-propylene rubber, heat stabilizer and lubricant, mix them with pretreated magnetic powder and put them into the open mill for 0.5 hours. Among them, the ethylene-propylene rubber is binary ethylene-propylene rubber, the heat stabilizer is calcium 2-ethylhexanoate, and the lubricant is oleic acid. The contents are shown in Table 1 and Table 2.

[0032] 3) The kneaded mixtu...

Embodiment 3

[0036] 1) Weigh an appropriate amount of plasticizer, coupling agent and ethanol into the high-speed mixer, mix in a closed manner and heat up to 70-110°C to reach an atomized state, then add ferrite magnetic powder and mix evenly, take it out after cooling The mixture is dried to remove ethanol to obtain pretreated magnetic powder. Among them, the plasticizer is a mixture of dioctyl phthalate and diisooctyl phthalate in equal proportions, the coupling agent is KH792, and the ferrite is barium ferrite. The contents are shown in Table 1 and Table 2. . The ethanol content is twice the plasticizer content.

[0037]2) Weigh an appropriate amount of ethylene-propylene rubber, heat stabilizer and lubricant, mix them with pretreated magnetic powder and put them into the internal mixer for internal mixing for 1 hour. Among them, the ethylene-propylene rubber is EPDM rubber, the heat stabilizer is calcium stearate, and the lubricant is magnesium stearate. The contents are shown i...

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PUM

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Abstract

The invention discloses a rubber magnetic strip used under low temperature and a preparation method thereof. The rubber magnetic strip consists of the following ingredients in percentage by mass: 85-95% of ferrite magnetic powder, 4-14% of ethylene propylene rubber and 1-3% of addition agent, wherein the addition agent comprises plasticizer, coupling agent, heat stabilizer and lubricating agent. The preparation method comprises the steps of high-speed blending, mixing, forming and cutting for packaging. The ethylene propylene rubber is used as a carrier for replacing the traditional chlorinated polyethylene, so that the prepared rubber magnetic strip is excellent in ageing-resistant performance, good in impact elasticity, good in chemical resistance, free of halogen, more environmental friendly and unlikely to embrittle and break when being used under low temperature.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a rubber magnetic strip for low temperature and a preparation method thereof. Background technique [0002] Bonded magnets are polymer-based composite permanent magnet materials made by uniformly mixing magnetic powder with binders such as resin, plastic or low-melting point metals, and then molded, calendered, extruded or injected. an important branch of . Bonded magnets are widely used in computer, electronic industry, automobile industry, office automation, household appliances and other fields, and become the basic material and magnetic strip of high-tech industries. Among them, bonded ferrite is the type with the largest output of bonded magnets. Bonded ferrite magnets are magnets that use a mixture of ferrite magnetic powder and bonding resin, which is press-molded into a desired magnet shape. [0003] When the present ferrite rubber magnetic strips ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/117C08L23/16C08K9/06C08K3/22H01F41/02
Inventor 金志洪胡江平徐琛傅晓敏李玉平翁德明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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