Mix Metal Thermal Stabilizer from Palm Fatty Acid Distillate

Abstract

Polyvinyl chloride (PVC) is a widely utilized material across various fields, however, it is prone to thermal degradation, even at temperatures as low as 70°C. To enhance  its thermal stability, the addition of thermal stabilizers is essential. Mixed metal stabilizers are among the most environmentally friendly and effective options, composed of carboxylate acids  and a combination of alkaline earth and transition metals. This study aims to synthesize a Ca/Zn based mixed metal stabilizer using Palm Fatty Acid Distillate (PFAD), a locally available raw material with significant potential as a source of carboxylate acid. The synthesized stabilizer,  termed "Ca/Zn palmat," utilizes calcium (Ca) and zinc (Zn), chosen for their non-toxic  properties. FTIR analysis confirmed the successful formation of Ca/Zn carboxylate groups from  PFAD. The optimal Ca:Zn ratio was determined to be 4:1, providing a PVC stability time of approximately 15 minutes based on the Congo red test. The ideal stabilizer dosage was found to  be 7 phr (parts per hundred resin). Furthermore, the addition of pentaerythritol as a co-stabilizer demonstrated a synergistic effect, significantly enhancing the thermal stability of PVC.