Influence of nano-CeO₂as Co-stabilizer on the thermal stabilization efficiency of novel calcium/Zinc soap stabilizers for poly(vinyl chloride)

Abstract

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 co‐stabilizer 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. J. VINYL ADDIT. TECHNOL., 20:243–249, 2014. © 2014 Society of Plastics Engineers

Synthesis and Study of Zinc Orotate and Its Synergistic Effect with Commercial Stabilizers for Stabilizing Poly(Vinyl Chloride)

“…The reason is that there are good synergy effect between ZnOr 2 and CaSt 2 , which can efficaciously enhance the thermal stability of PVC. For another, Figure 9 also shows similar testing results: that the thermal stability time of PVC/ZnSt 2 /CaSt 2 was increased with the increasing of CaSt 2 concentration [3,35]. By comparing Figure 8 and Figure 9, it can be confirmed that ZnOr 2 displays a better stabilizing effect for PVC than the commercial thermal stabilizer ZnSt 2 .…”

“…Hence, in order to create more high-efficiency and eco-friendly thermal stabilizers, it should be integrated with other stabilizers (metal soap, auxiliary stabilizers, etc.) to manufacture complex thermal stabilizers [3,35]. This study includes an investigation of choosing calcium stearate (CaSt 2 ) as a traditional metal soap stabilizer, with DBM and PER as auxiliary thermal stabilizer.…”

“…It can be observed from Figure 8 that the thermal stability time of PVC/ZnOr 2 was correspondingly short, but could be increased by increasing the CaSt 2 concentration from 0.0 to 2.4. CaSt 2 can react with ZnCl 2 to produce CaCl 2 , which can suppress the catalytic degradation of PVC, so that the thermal stability time of the PVC samples was step by step improved with increasing CaSt 2 content [3,35]. Interestingly, it was observed that the thermal stability time of PVC was decreased if only used with CaSt 2 .…”

Study on lanthanum-pentaerythritol alkoxide as a thermal stabilizer for rigid polyvinyl chloride

“…Metal soaps are the most common thermal stabilizers for PVC. Because the calcium (Ca) soap and zinc (Zn) soap are relatively safe thermal stabilizers for PVC, the United States Food and Drug Administration states that Ca/Zn soap stabilizer is a nontoxic additive [9]. Calcium stearate/zinc stearate (CaSt 2 /ZnSt 2 ), for example, is widely used in food packaging materials, children's toys, and bottle seals because of its nontoxic property.…”

Study on the Use of Rare Earth Stabilizer as Poly(Vinyl Chloride) Stabilizer

“…As we known, the initial antidiscoloration ability of zinc stearate is very good and has good synergistic effect with calcium stearate and PE. [ 10,11 ] So mixed rare earth stabilizer with them can change the defect of the single stabilizer.…”