Rubber Chem Encyclopedia

Relationship between reclaimed rubber vulcanization system and anti-vulcanization properties

Create Date:2019-11-07 08:47:25Click volume:473
Relationship between reclaimed rubber vulcanization system and anti-vulcanization properties

Compared with natural rubber, reversible rubber products are not prone to vulcanization in the production process. Therefore, the use of appropriate amount of reclaimed rubber in natural rubber can significantly reduce the tendency of rubber vulcanization. When using recycled rubber to produce rubber products, rubber products manufacturers Generally, by adjusting the reclaimed rubber vulcanization system to further reduce the tendency of the vulcanization reversion of the rubber compound, what is the relationship between the vulcanization system and the anti-vulcanization reversion property of the reclaimed rubber?

1. What is the vulcanization counter?

The so-called vulcanization anti-origin, that is, the softening caused by the sulfur permeation of the rubber compound, the vulcanization temperature is too high, and the vulcanization time is too long, the internal cross-linking network of the vulcanized rubber will be broken, and the mechanical properties of the vulcanized rubber will be degraded; The molecular chain will also be broken under the action of heat or other external factors. When the hardness of the rubber is reduced and the tensile strength is continuously reduced, the reclaimed rubber softens; therefore, the vulcanization system should be carefully selected when vulcanizing the reclaimed rubber to avoid vulcanization. original.

2. Which vulcanization system can improve the anti-reverse property of the rubber compound

At present, the vulcanization systems commonly used in the production of recycled rubber products include ordinary sulfur vulcanization systems, semi-effective vulcanization systems, effective vulcanization systems, peroxide vulcanization systems, and resin vulcanization systems. Vulcanizates of different vulcanization systems have different vulcanization resistance. Under normal circumstances, the choice of soluble effective vulcanization system after vulcanization of the rubber anti-reverse performance is excellent, the effective vulcanization system is second, the semi-effective vulcanization system rubber anti-reverse is slightly poor, the traditional sulfur vulcanization system is prone to vulcanization. Therefore, in the production process of recycled rubber products, a soluble effective vulcanization system, a semi-effective vulcanization system, etc. can be selected to reduce the vulcanization of the rubber compound. The reclaimed rubber which is selected to be vulcanized by the effective vulcanization system does not substantially undergo vulcanization reversion below 160 °C.

3. Why are the anti-reverse properties of the rubber compounds of different vulcanization systems different?

The vulcanized materials of different vulcanization systems produce different types of cross-linking bonds. The monosulfide bond and the disulfide bond produced by the effective vulcanization system have good heat resistance. Under high temperature conditions, the crosslinked network structure of the rubber material is basically unchanged, and the vulcanization can be reduced. The tendency of the original.

Having said that, perhaps you will ask: In order to avoid the occurrence of vulcanization reversion in the production of recycled rubber products, can you use an effective vulcanization system? the answer is negative! Different vulcanized systems have different basic properties after vulcanization. For example, reclaimed rubber products with particularly high mechanical strength are usually only vulcanized with sulfur. Therefore, when considering the tendency of rubber vulcanization, the rubber products need to comprehensively consider the vulcanization system. Features and impact on the quality of recycled rubber products.