Rubber magnetic stripe and preparation method thereof

Abstract

The invention discloses a rubber magnetic stripe and a preparation method thereof. The rubber magnetic stripe is prepared from the following ingredients in mass percent content: 75% to 85% of permanent-magnet ferrite magnetic powder, 5% to 15% of rubber, 1% to 5% of plasticizer, 1% to 3% of accelerant, 1% to 3% of activating agent, 0.5% to 2% of anti-ageing agent, 1% to 3% of coupling agent and 0.5% to 3% of vulcanizing agent. The preparation method comprises the following steps: 1) modifying the permanent-magnet ferrite magnetic powder to obtain modified magnetic powder; 2) mixing and smelting the modified magnetic powder, the rubber, the plasticizer, the accelerant, the activating agent, the anti-ageing agent and the vulcanizing agent to obtain a blank; 3) mixing and breaking the blank and rolling the blank into pieces to obtain semi-finished product pieces; 4) cutting and vulcanizing the semi-finished product pieces to obtain vulcanized pieces; 5) performing microwave treatment on the vulcanized pieces and cooling and cutting the vulcanized pieces. The rubber magnetic stripe disclosed by the invention has the advantages of large magnetism, high mechanical strength, good dimensional stability, evenness in internal and external vulcanization, long service life, simple preparation technology and low energy consumption.

Description

technical field [0001] The invention relates to a rubber magnetic strip and a preparation method thereof. Background technique [0002] Magnetic rubber is a new type of polymer composite material, which is formulated from raw rubber, magnetic powder (magnetic filler), additives, etc. Magnetic properties are the basic properties of magnetic rubber. The more common use of magnetic rubber is as a sealing strip for refrigerator doors, cold storage doors, etc. With the development of technology, the application range of rubber magnetic strips is becoming wider and wider, such as in radio technology, TV audio and video, communication technology, electronics, etc. Computer memory devices, teaching aids, toys, medical equipment, etc. Compared with traditional magnetic sintered materials, magnetic rubber has the advantages of low density, high uniformity and good flexibility. [0003] However, the existing magnetic rubber products generally have defects such as uneven vulcanization...

AI Technical Summary

Problems solved by technology

[0003] However, the existing magnetic rubber products generally have defects such as uneven vulcanization inside and outside, short service life, and high production costs, mainly because rubber is a poor heat-conducting material, and its heat treatment is difficult

Taking the preparation of magnetic strips as an example, electric ovens are generally used for heat treatment in the preparation of magnetic strips in the existing process. The heat is first transferred to the surface of the magnetic strip through the air medium, then transferred from the surface of the magnetic strip to the inner layer, and finally transferred to the innermost layer of the magnetic strip. , for rubber magnetic strips, such a heat transfer route and method not only have a very slow heat transfer rate, but also a very low heat utilization rate, especially when processing magnetic rubber products with a thickness of more than 3mm, not only the heat treatment time is long, the energy High consumption, and the effect of heat treatment is very unsatisfactory, the degree of vulcanization inside and outside is very uneven, which seriously affects the quality and service life of finished products

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