Powder Adhesion Promoters Based on Hydrolysis Lignin for Rubbers

Powder adhesion promoters for rubbers based on hydrolysis lignin were obtained by its treatment with TiCl4 solution in C6H14. The physical-chemical properties of the obtained products were determined: bulk density, content of Ti(IV), carbonyl, carboxyl groups, acid-insoluble lignin. The obtained powder adhesion promoters were introduced into rubber compound in the amount of up to 5 phr (parts per 100 of rubber). Butadiene-α-methylstyrene rubber grade SBR-1705 HI-AR was used. The effect of the promoters on the kinetic parameters of vulcanization and physical-mechanical properties of rubbers was studied. It was revealed that the introduction of the studied powder promoters of adhesion into the rubber compound allows to increase the bond strength at the interface rubber–brass-plated metal cord by 2–3 times.