Study on Preparation and Performance of Bismuth Isostearate as a Thermal Stabilizer for PVC
Biostearic acid and bismuth oxide were used as the main raw materials to synthesize bismuth isostearate(BI) by two-step method and was characterized by Fourier transform infrared (FTTR)spectroscopy.Then BI applied to PVC product as a thermal stabilizer and the thermal stability of PVC stabilized with BI was studied by thermal aging oven test,Congo red test,conductivity test and thermogravimetric analysis (TGA).The results showed that when adding 4 phr BI,the initial whiteness of PVC could be maintained for 60 min and the static thermal stability time of Congo red test was 37.5 min,so BI could be used as a liquid heat stabilizer and obviously improved the initial thermal stability and long-term heat stability of PVC.Moreover,the result of quantum chemical calculation showed that BI could improve the thermal stability of PVC products by substituting unstable chlorine.
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