Blends of fatty acid soaps with chemical peptizers are intended to achieve peptization by lubrication of the molecular chain (also acting as dispersant and processing aids) and by chain scission (ref.
27) was allowed for peptization to occur before addition of the other ingredients (table 6, mixing sequences n degrees 3 and 4).
Silica-filled vulcanizates prepared from raw rubber subjected to peptization show some effects attributable to peptization (table 7).
Peptization - In order to decrease the third-stage viscosity, we combined peptization during the first-stage sequence and the optimized three-stage mixing procedure (mixing sequence n degrees 11).
As exptected from previous peptization results, rheometer delta torque is increased and abrasion loss is improved, compared to mixing sequence n degrees 6 results; dispersion and fatigue block tearing resistance are worse, but then of course, similar to mixing sequence n degrees 1 results (table 9).