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Xu X.,Zhejiang University of Technology | Chen S.,Zhejiang University of Technology | Tang W.,Zhejiang Himpton New Material Co. | Qu Y.,Zhejiang Himpton New Material Co.
Polymer Degradation and Stability | Year: 2014

Basic zinc cyanurate (Zn3(C3N3O 3)2·ZnO, represented as Zn3Cy 2) was synthesized via a precipitation method, and investigated as a thermal stabilizer for poly(vinyl chloride) (PVC) by thermogravimetric analysis (TGA), Congo red test and discoloration test. The thermal stability of PVC was significantly enhanced with the addition of Zn3Cy2. Compared with zinc stearate (ZnSt2), it is observed a significant improvement that Zn3Cy2 could delay the "zinc burning" of PVC. This is attributed to the strong ability of the cyanurate anions in Zn3Cy2 to absorb the hydrogen chloride released by the degradation of PVC. Moreover, mixing Zn3Cy2 with calcium stearate (CaSt2) in different mass ratios greatly promoted the thermal stability of PVC. Excellent synergistic effects could be observed when CaSt2/Zn3Cy2 combined with some commercial auxiliary stabilizers. Addition of dibenzoylmethane (DBM) brought a remarkable increase in initial color for PVC containing CaSt2/Zn 3Cy2 while epoxidized soybean oil (ESBO) could improve both initial color and long-term stability. ©2013 Elsevier Ltd. All rights reserved. Source


Chen S.,Zhejiang University of Technology | Xu X.,Zhejiang University of Technology | Zhang J.,Zhejiang University of Technology | Tang W.,Zhejiang Himpton New Material Co. | And 2 more authors.
Polymer Degradation and Stability | Year: 2014

A series of novel ureido organic stabilizers for poly(vinyl chloride) (PVC) with different length of alkyl chains, including N,N'-bis(phenylcarbamoyl) ethylenediamine (NA2), N,N'-bis(phenylcarbamoyl)butylenediamine (NA4) and N,N'-bis(phenylcar- bamoyl)hexamethylenediamine (NA6) were designed and synthesized, which have greater stabilizing efficiency compared with Ca/Zn stabilizers and phenylurea at the same concentration in PVC mixtures. The results of Congo red test, discoloration test, thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectra showed that the ureido moieties of NAn (n = 2, 4, 6) have stronger ability to replace the labile chlorine atoms in PVC chains, but weaker ability to absorb hydrogen chloride (HCl) than those in phenylurea. On the other hand, longer alkyl chains in the synthesized organic stabilizers had positive effect in stabilizing efficiency for PVC, which was proved by the results that NA6 was the most efficient stabilizer among the present study, followed by NA4 and NA2. Furthermore, mixing the model compound NA6 with zinc stearate in different mass ratios led to a true synergistic effect, the "zinc burning" of PVC products was remarkably postponed. © 2014 Elsevier Ltd. All rights reserved. Source

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