The average relative molecular weight of chlorinated rubber is 5000~20000. The tensile strength of unplasticized chlorinated rubber is very high even when the deformation speed is low, reaching 39.24MPa, but the relative elongation is very low. The strength of plasticized chlorinated rubber is related to the type of plasticizer and the degree of plasticization. Like other chlorinated polymers, chlorinated polymers have high chemical stability. Since chlorinated rubber is basically not used without plasticizer, the chemical stability of its film, like its strength performance, depends largely on the type and amount of plasticizer, colorant, filler and stabilizer (the film generated by chlorinated rubber alone is firm and brittle, because the film generated is very thin, so this unplasticized polymer is only used to manufacture printing ink). Like most highly chlorinated polymers, chlorinated rubber tends to generate gel under unsuitable conditions if plasticizers are not added. The formation mechanism of gel is very complex and is related to the type of additives added. The common one is the dehydrochlorination reaction with autocatalytic property, which leads to cross-linking and the formation of gel. Most stabilizers act like acid absorbers and prevent the occurrence of autocatalytic reactions. Chlorinated rubber can be used together with a variety of synthetic or natural resins and rubbers. After being used together with resins, the hardness and wear resistance of the obtained products can be improved in most cases. This is important for coatings and adhesives. Because it requires high creep resistance.
Post time: Nov-18-2022