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Open AccessArticle

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.
Int. J. Mol. Sci. 2011, 12(3), 1756-1766;
Received: 26 January 2011 / Revised: 9 February 2011 / Accepted: 7 March 2011 / Published: 8 March 2011
(This article belongs to the Section Materials Science)
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. View Full-Text
Keywords: Zn-Al-LDHs; polyvinyl chloride; stabilizer Zn-Al-LDHs; polyvinyl chloride; stabilizer
MDPI and ACS Style

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.

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