Magnetic rubber is a general term for magnetic elastomer materials. It is made of raw rubber, magnetic powder (magnetic filler) and other additives. Magnetic properties are the basic properties of magnetic rubber. Under the action of external magnetic field, magnetic rubber exhibits different magnetic grades, among which the magnetic properties have high practical value.
Since the rubber itself is not magnetic, its magnetic properties come from a large amount of filled magnetic powder (2 to 8 times the mass of the raw rubber). Therefore, magnetic powder is indispensable for the manufacture of magnetic rubber. According to the composition, the magnetic additive can be divided into two major categories: metal magnetic powder and ferrite powder, collectively referred to as magnetic powder. Metal magnetic powder includes iron cobalt powder, etc. Iron cobalt powder is the most widely used. Metal magnetic powder is less used because of its high price and difficulty in adding. Currently used are ferrite powders, which are compounds of iron oxide and certain divalent metals. Even if it is a ferrite magnetic powder, the final magnetic strength differs depending on the crystal form, particle size and uniformity.
The manufacturing process of magnetic rubber is similar to other products. In formula design, we must first determine the type, particle size and amount of magnetic powder. Next, the rubber type should be determined according to the requirements of use. For example, natural rubber should be used for wear resistance. Before or after vulcanization in the process, it is necessary to add a magnetization process that is not available in the manufacture of other products, so as to give the product the advantage of magnetization before permanent magnetic vulcanization. The direction of the external magnetic field is unchanged, and the rubber network is smooth; the magnetization after vulcanization The passability is poor, but the operation is more convenient. In short, each has its own merits.
Magnetic characterizations include magnetic intensities, residual magnetic inductivity, and magnetic energy products. Magnetic induction is the most common. Its unit of measure is Gaussian (GS).
The traditional use of magnetic rubber is represented by the Kumen sealing strip of the refrigerator, but with the development of high technology and household appliances entering thousands of households, the application of magnetic rubber is also changing with each passing day. Applications include refrigerator seals and computer memory devices. TV audio and video, teaching aids, toys and medical equipment.