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Title: Effect of stearate preheating on the thermal stability of plasticized PVC compounds
Author: Gonzalez-Ortiz, L.J.
Arellano, M.
Sanchez-Pena, M.J.
Mendizábal, E. M.
Jasso-Gastinel, C.F.
Issue Date: 2006
Abstract: Effect of preheating of stearates on the processing and post-processing thermal stability of poly(vinyl chloride) compounds, plasticized with di(2-ethylhexyl) phthalate (DEHP) and epoxidized soybean oil (ESO), using several ratios of calcium/zinc stearates and DEHP/ESO is reported. The compounds were prepared as follows: (1) dry-blending the compound components, (2) pelletizing the dry-blend and (3) extruding the pellets to obtain a ribbon geometry. Processing stability was determined by: (a) mechanical characterization and (b) visual color comparison of extruded samples. Post-processing thermal stability was followed by: (a) measurement of HCl release from heated pellets and (b) color changes in heated ribbon samples. From a practical point of view, the preheating has a negligible effect on the initial color of formulations; except for the case of formulations without both ESO and CaSt2. However, the effect of the preheating on the post-processing thermal stability is strongly determined by the composition formulation. © 2006 Elsevier Ltd. All rights reserved.
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