Effect of Orotic Acid on the Stabilization Efficiency of Ca-Zn Thermal Stabilizers for Poly(vinyl chloride)

Abstract:

The effect of orotic acid (OA) and its mixtures with calcium stearate (CaSt₂) and zinc stearate (ZnSt₂) in various ratios on the thermal stability of PVC has been investigated by Congo red and discoloration tests. The results shows that OA acts as a long-term thermal stabilizer for PVC like CaSt₂, and the combination of OA and ZnSt₂ exhibited a synergistic stabilization effect at a certain ratio. This is due to the ability of OA to absorb HCl released during the degradation of PVC to diminish its catalytic effects, and react with ZnCl₂ to stop its catalytic effect for PVC. CaSt₂-ZnSt₂/OA stabilizers exhibit good synergistic effects with both acceptable initial color and long-term stability for PVC

• Periodical: Materials Science Forum (Volume 815)
• Pages: 545-550
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.815.545
• Online since: March 2015
• Authors: Xiao Peng Xu, Si Chen, Yan Qin Shi, Bo Zhen Wu, Meng Ma, Xu Wang*
• Keywords: Auxiliary Thermal Stabilizer, Orotic Acid, Poly(vinyl chloride), Stabilization Mechanism, Synergistic Effect

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