Dynamic Mechanics Characterization Of Wasted Vulcanized Rubber Reclaim Behavior And Reclaim Process Analysis

In this paper the behavior of wasted rubber regeneration was characterized by the obtained regeneration curves which from the rotor-less rheometer, for the first time. The influence of butyl rubber dosage, regeneration temperature and regeneration activator on regeneration curves were investigated. Through investigated the effect of different treatments on regeneration properties of reclaimed rubber, it verified the role of oxygen in regeneration process. The impact of oxidation degree on regeneration properties of reclaimed rubber were quantitative researched by adding various amount of reagents. Two kinds of alkyl disulfide were synthesized. Then studied there effect on regeneration properties of reclaimed rubber, and found they had limited effective. Separated the activator 480 and analyzed the structure of each component. Based on the structure of activator 480, one kind of phenol disulfide was synthesized. And their effects on the regeneration properties of reclaimed rubber were compared.The regeneration curve could be divided into four regions, rising area, first falling area, rebounding area and second dropping area, and they related to the temperature, the broken of crosslink network, the combination speed between broken chain radicals and the radical coupling termination reaction between macromolecules, respectively. Butyl rubber had no effect on the regeneration reaction, and it could be used as adhesive. Raised temperature or used activators could promote the generation of macromolecular radicals and improve the concentration of macromolecular radicals and speed up the regeneration reaction rate at last.2,2’-dibenzamidodiphenyldisulphide and octadecylamine were used as regeneration activators in wasted rubber powder reclaiming process respectively. And the influences of different treatments on regeneration properties of reclaimed rubber were qualitative studied. It turned out that the reclaimed rubber performed best by ice cooling treatment and appropriate amount of oxygen would be good for regeneration. Then switched to activator 450 and the impact of oxidation degree on regeneration properties of reclaimed rubber were quantitative researched by adding various amount of hydrogen peroxide and sodium percarbonate. The use of hydrogen peroxide or sodium percarbonate increased sol content, decreased Mooney viscosity and improved mechanical properties of reclaimed rubber. The optimal usage of hydrogen peroxide was 0.7phr and sodium percarbonate was 1.8phr in consideration of its processability and mechanical properties.Through column chromatography, we successful isolated three components from activator 480. And the major ingredient of activator 480 was disulfide-tert-butylphenol. Phenol disulfide was synthesized by 2,4-di-tert-butylphenol. The influence of three regeneration activators on regeneration properties of reclaimed rubber, they were the crystal substance of phenol disulfide(named Y-17), the filtering medium of phenol disulfide(named Y-17-0) and the activator 480. The results showed that the degree of regeneration and mechanical properties of reclaimed rubber was the best by adding Y-17, and the value of adding activator 480 was the worst, Y-17-0 in between. The by-products in Y-17-0 had low effect on its functionality as an activator. No needed to purify the synthesized phenol disulfide, simplify the production process and cut the cost of product.