Molecular Sieves in the Vulcanization of Rubber

Abstract

1. The effect has been studied of accelerators, introduced into a rubber mix in the absorbed state on molecular sieves, on the scorch resistance of the mixes at 110°–130° C. 2. Molecular sieves can be used to introduce ultra-accelerators (triethylammonium dibutyldithiocarbamate) and activators (ethanolamines) into rubber mixes, so permitting vulcanization to be accelerated without the danger of scorching during mixing. 3. Molecular sieves can be used to introduce gaseous ammonia into rubber mixes; ammonia considerably accelerates vulcanization and can replace, either completely or partially, such accelerators as MBTS or DPG.

Butyl Rubber: Compound Development and Characterization.

“…Reversion is postulated to occur when the initially formed mono-, di-, and polysulfidic cross-links [9] degrade through a process known as desulmrization. When desulfurization is faster than the cross-linking reaction, reversion occurs [6,10]. This causes physical and mechanical properties such as tensile strength, stiffness, and tear resistance to deteriorate.…”