Diimide hydrogenation of NBR latex using different zinc ions catalytic system.

The zinc ion is used as a catalyst to effectively replace the traditional copper ion catalyst to participate in the redox reaction of hydrazine hydrate and hydrogen peroxide to generate diimide to selectively hydrogenate the carbon–carbon double bonds in the nitrile butadiene rubber (NBR) latex to prepare hydrogenated NBR (HNBR). The optimized zinc ion catalytic hydrogenation system was obtained through orthogonal design experiment screening. Among them, the hydrogenation of NBR latex with zinc chloride as a catalyst can obtain HNBR-ZnCl2 products with high hydrogenation degree (90.58%), high thermal stability, and high regularity. Using zinc ions as a catalyst instead of copper ions can effectively improve the damage of copper ions remaining in the hydrogenated product on the thermal-oxidative aging resistance performance of rubber. Compared with HNBR hydrogenated by copper ions, HNBR hydrogenated by zinc ion catalysts has better thermal-oxidative aging resistance performance. [ABSTRACT FROM AUTHOR]