Influence of Nano-CeO2 as Co-Stabilizer on the Thermal Stabilization Efficiency of Novel Calcium/Zinc Soap Stabilizers for Poly(vinyl chloride)

摘要

The novel organic calcium (Ca)/zinc (Zn) stabilizer of poly(vinyl chloride) (PVC) was synthesized from poly (zinc methylacrylate) and Ca adipate. The influences of Zn/Ca soap weight ratios and nano-CeO2 as costabilizer on the thermal stability of PVC were investigated. Congo red testing, thermogravimetric analysis, dynamic rheology, and dynamic mechanical analysis of the mixtures were performed. The results show that the novel stabilizer has good stabilization efficiency on PVC. When 5 phr (parts by weight per hundred parts of resin) of novel stabilizer (weight ratio of Zn/Ca soap is 6/4) in 100 phr of PVC is used as stabilizer, the Congo red time can reach 192 min, which is 131 min longer than 5 phr of the mixture of 3 phr of Zn stearate and 2 phr of Ca stearate as stabilizer. If 3 phr of mixture of Zn methylacrylate with Ca adipate (weight ratio of Zn/Ca soap is 4/6) and 2 phr of nano-CeO2 are used as co-stabilizers, the Congo red time is 205 min. The combination of nano-CeO2 with Ca/Zn soap stabilizer shows an obvious improvement for the thermal stability of the PVC. (c) 2014 Society of Plastics Engineers