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High performance metal stearates thermal stabilizers for poly vinyl chloride


International Journal of Petrochemical Science & Engineering
Abd El-Ghaffar MA,1 Youssef EAM,2 Afify MF1

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Abstract

Low  thermal  stability  of  poly  vinyl  chloride  (PVC)  is  one  of  the  most  serious  problems  thatfacing its processing. In the present study some single and mixed metal stearate soaps were prepared, characterized and evaluated for their performance in enhancing and imparts the thermal stability of PVC. Accordingly, calcium stearate, barium stearate, zinc stearate and  also  the  mixed  metal  stearate  salt  of  calcium,  zinc  and  barium  were  prepared  by  the  double decomposition of sodium stearate and single or mixed metal acetate solutions. The prepared metal stearates were characterized via spectroscopic analysis (FT-IR and XRD) in addition to micro analysis and thermal gravimetric analysis (TGA). The results showed that  the  prepared  metal  stearates  are  good  thermal  stabilizers  for  PVC;  also  the  thermal  stability  of  the  prepared  (Ca/Ba/Zn)  stearate  was  enhanced  when  melamine,  ammonium  poly phosphate, magnesium hydroxide and Ca/Zn phosphate are mixed with it.

Keywords

poly vinyl chloride, thermal stabilizer, metal stearates

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