EFFECT OF CO-STABILIZER DOSAGE ON THE EFFECTIVENESS OF PALM-BASED POLYVINYL CHLORIDE MIXED METAL THERMAL STABILIZER

• Main Author: Kaditya Tayip, Daffa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74019
• Institution: Institut Teknologi Bandung

Polyvinyl chloride (PVC) is a synthethic resin that is commonly used for piping and constructions. In general, PVC has low thermal stability that makes them prone to degradation. PVC’s thermal degradation cause changes in the color and mechanical properties of PVC. The degradation of PVC is initialized by defect, which is the presence of allylic or tertiary chlorine atom that may release HCl if heated. Thermal stabilizer is used to substitute the labile chlorine atom or to neutralize HCl that is released due to degradation. A mixed metal thermal stabilizer is one of the common thermal stabilizer used in industry. This type of stabilizer is mildly effective, but the effectivity can be enhanced with the help of co-stabilizer. The purpose of this research is to investigate the effect of co-stabilizer dosage variations on the performance of mixed metal thermal stabilizer. The mixed metal thermal stabilizer that is studied is the palm-based Ca/Zn thermal stabilizer developed by Laboratorium Rekayasa Produk Industri Proses ITB. Co-stabilizer that is studied is xylitol. The stabilization performance is measured by means of dehydrochlorination. The test results show the synergy between the co-stabilizer and the mixed metal thermal stabilizer. The dose variation curve shows a second order equation. The best dosage was obtained in the range of 0.8 to 1.0 phr which provided an induction time and stability time of 70 and 110 minutes, respectively.