Process for the elimination of residual mercaptans from nitrile rubbers

摘要

Process for the elimination of residual mercaptans from nitrile rubbers, comprising:
a. adding a colloidal emulsion of sulfur to a nitrile latex emulsion (NBR rubber latex) containing free mercaptan and with a pH of between 7 and 14, at a temperature ranging from 30 to 120°C;
b. coagulating the nitrile latex
c. washing with demineralized water and drying the NBR rubber recovered after coagulation.