Study of Sulfur-Free Salt Vulcanization of Films Based on Carboxyl-Containing Butadiene-Nitrile Latexes

Abstract

Samples were made and colloidal-chemical properties of carboxyl-containing butadiene-nitrile latex with different degree of neutralization of carboxyl groups were investigated. From these samples, compositions including zinc oxide dispersion without the addition of sulfur and ultra-accelerators of vulcanization were prepared. Films were made by ion deposition method (coagulant dipping) with their subsequent salt vulcanization. The influence of the degree of neutralization of carboxyl groups in the links of macromolecules on the physical and mechanical properties of the films was studied. It has been established that the maximum values of conditional tensile strength of films are achieved when the surface of latex particles is saturated with carboxylate ions. A method for calculating the degree of saturation of the particle surface with carboxylate ions is proposed, which allows to predict the amount of neutralizing alkaline agents for creating products with increased strength and elasticity from latexes with different dispersity and different content of carboxyl-containing monomer links in the copolymer.