With the increase of rubber content, in order to ensure the hardness of bead wire rubber, the amount of carbon black must be increased, which brings great difficulties to the mixing process of rubber, greatly increases the power consumption during mixing, and the rubber temperature rises quickly and is easy to burn. Magnesium oxide mainly plays the role of anti-scorching agent, vulcanization accelerator, acid absorber, high temperature resistance, and fire retardant in tires. Magnesium oxide has the effect of inhibiting the reaction of sulfur and rubber, so that the free sulfur content in the rubber is maintained at a high level, thereby improving the adhesive performance of the rubber and the safety performance of mixing processing. Hebei Messi Biology Co., Ltd. has tested the application of magnesium oxide in bead wire rubber of load-bearing bias tires and achieved good results.
Precautions for magnesium oxide in tires:
If the moisture, hydrochloric acid insoluble matter, and water soluble matter of magnesium oxide are too high, it is easy to cause blistering and sand eyes; if the content is too low, it will affect its toughness and wear resistance; if the calcium content is too high, it will cause fracture. The adhesion between the rubber pad and the metal is not good. Generally, this happens because the rubber is not fully cooked, which leads to poor adhesion. In other words, the main role is played by the rubber and other main raw materials in the tire. Magnesium oxide only improves the performance of the tire itself and cannot exist independently. Butyl rubber becomes soft during rubber refining. Magnesium oxide acts as a vulcanization accelerator and anti-scorch agent to improve the performance of the product itself. If the product itself has poor performance, magnesium oxide will not play such a big role. Because magnesium oxide only plays an auxiliary role, customers are advised to check whether the formula of its vulcanization system and softening system is reasonable and whether there are certain quality problems.