Chlorinated butyl recycled rubber processed from waste medical butyl bottle caps and stoppers as raw materials has good air tightness, high plasticity, heat resistance and chemical resistance. It can be used alone or with unsaturated rubbers such as natural rubber and chlorine. Butadiene rubber, styrene-butadiene rubber, butadiene rubber, etc. are used to produce various rubber products. When using chlorinated butyl recycled rubber to produce rubber products, aside from the compression set parameters of the rubber itself, the compounding agent is the main factor that adjusts the compression set.
For chlorinated butyl recycled rubber, compression set can be regarded as another manifestation of heat resistance, which directly affects the performance and life of chlorinated butyl rubber products, especially butyl heat-resistant sealing products. Among them, the vulcanization system compounding agent and the reinforced filling system compounding agent have the greatest influence on the rubber compression permanent deformation.
1. The curing system of chlorinated butyl recycled rubber products affects compression permanent deformation
In the vulcanization system commonly 2LLYY0312 used for chlorinated butyl recycled rubber products, the compression set of zinc dithiocarbamate after vulcanization is the best. The performance is better than the vulcanizate after vulcanization of zinc oxide-thiuram vulcanization system; therefore, chlorinated butyl reclaimed rubber products with strict requirements for compression resistance and permanent deformation can be vulcanized with zinc dithiocarbamate.
It should be noted that when using the same vulcanization system of chlorinated butyl reclaimed rubber, the compression set of compression vulcanized rubber is better than the compression set of direct vulcanized vulcanized rubber.
2. Reinforced filling system of chlorinated butyl rubber products affects compression deformation
It is well known that when using white carbon black in chlorinated butyl recycled rubber products, the rubber compound has good heat resistance. Inorganic fillers can reduce the cost of raw materials for rubber products; but for permanent compression deformation of rubber compounds, white carbon black will produce Negative impact. Therefore, when rubber products produced using chlorinated butyl recycled rubber need to have excellent compression set resistance, the use of silica and other inorganic fillers should be avoided as much as possible, or their amount should be controlled reasonably.
The compressive permanent deformation resistance of chlorinated butyl recycled rubber products is closely related to the performance and life of rubber products. Rubber product manufacturers must choose the appropriate index of chlorinated butyl recycled rubber, and reasonably choose the rubber product vulcanization system and reinforcement filling system The types of compounding agents, and reasonable control of their dosage, reduce the cost of raw materials on the premise of ensuring quality.