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The Effect of Zn-Al-Hydrotalcites Composited with Calcium Stearate and β-Diketone on the Thermal Stability of PVC
Hunan Chemical Vocational and Technical College, Zhuzhou 412004, China
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
* Author to whom correspondence should be addressed.
Received: 26 January 2011; in revised form: 9 February 2011 / Accepted: 7 March 2011 / Published: 8 March 2011
Abstract: A clean-route synthesis of Zn-Al-hydrotalcites (Zn-Al-LDHs) using zinc oxide and sodium aluminate solution has been developed. The as-obtained materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The effects of metal ions at different molar ratios on the performance of hydrotalcites were discussed. The results showed that the Zn-Al-hydrotalcites can be successfully synthesized at three different Zn/Al ratios of 3:1, 2:1 and 1:1. Thermal aging tests of polyvinyl chloride (PVC) mixed with Zn-Al-LDHs, calcium stearate (CaSt2) and β-diketone were carried out in a thermal aging test box by observing the color change. The results showed that Zn-Al-LDHs can not only enhance the stability of PVC significantly due to the improved capacity of HCl-adsorption but also increase the initial stability and ensure good-initial coloring due to the presence of the Zn element. The effects of various amounts of Zn-Al-LDHs, CaSt2 and β-diketone on the thermal stability of PVC were discussed. The optimum composition was determined to be 0.1 g Zn-Al-LDHs, 0.15 g CaSt2 and 0.25 g β-diketone in 5 g PVC.
Keywords: Zn-Al-LDHs; polyvinyl chloride; stabilizer
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Tong, M.; Chen, H.; Yang, Z.; Wen, R. The Effect of Zn-Al-Hydrotalcites Composited with Calcium Stearate and β-Diketone on the Thermal Stability of PVC. Int. J. Mol. Sci. 2011, 12, 1756-1766.
Tong M, Chen H, Yang Z, Wen R. The Effect of Zn-Al-Hydrotalcites Composited with Calcium Stearate and β-Diketone on the Thermal Stability of PVC. International Journal of Molecular Sciences. 2011; 12(3):1756-1766.
Tong, Mengliang; Chen, Hongyan; Yang, Zhanhong; Wen, Runjuan. 2011. "The Effect of Zn-Al-Hydrotalcites Composited with Calcium Stearate and β-Diketone on the Thermal Stability of PVC." Int. J. Mol. Sci. 12, no. 3: 1756-1766.