Month: November 2018

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.

(2) shock absorption foot protection

When people are exercising or walking, they need to wear shoes and socks to protect them. Because the shoes are in direct contact with the ground, the functions of the foot protection are heavier, and it is necessary to prevent the sharp objects and the thorns from being cut, and to prevent external impact. For professional sports shoes, it is necessary to withstand severe shocks and shocks. Especially for some sports that have a strong impact on the ground and high landing height, such as football, basketball and pole vault, the protective function of the shoes is more important.

The air cushion introduced in the energy return section also has a shock absorption function. In addition, some special rubber shoes for labor protection are provided with metal parts at the toe area to prevent injuries to the toes and insteps when heavy objects are hit. It can be seen from the above that the foot protection function of the rubber shoes is mainly achieved by two measures: one is to use the buffering and shock absorption of the gas to soften the steel; the other is to use the rigid body (steel head) to harden the hard.

(3) Torque correction

The concept aims to correct the common problem of walking and skewing through the design and modification of the shoes, thereby reducing the fatigue caused by poor posture and increasing the ease of progress. Most people instinctively become more or less in the walking foot (individually different).

In the 1980s, some rubber shoes companies raised the concept of “torque correction” and proposed a “correction system” accordingly. The system is positioned in the groove between the fore and aft palms (called the torsion groove). A longitudinal strip bar (called a torsion bar) is placed in the center of the groove, and the front and rear parts of the sole are penetrated to make the piece integrated, and the torsion force is limited to a small range, and the torsion deviation amplitude is also significantly reduced, to a large extent. Corrected the phenomenon of partial twist.