Effect of stearate preheating on the thermal stability of plasticized PVC compounds |
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| Authors: | Luis J González-Ortiz M Judith Sánchez-Peña Carlos F Jasso-Gastinel |
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| Institution: | a Chemistry Department, University of Guadalajara, Blvd. Gral. Marcelino García Barragán 1451 Guadalajara, Jalisco 44430, Mexico
b Chemical Engineering Department, University of Guadalajara, Blvd. Gral. Marcelino García Barragán 1451 Guadalajara, Jalisco. 44430, Mexico |
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| 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. |
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| Keywords: | Preheating of stearates Plasticized PVC Thermal stability Color stability HCl release |
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