The Effect of Zn-Al-Hydrotalcites Composited with Calcium Stearate and β-Diketone on the Thermal Stability of PVC

International Journal of Molecular Sciences

Mengliang Tong²  Hongyan Chen¹  Zhanhong Yang¹ 

[1] College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; E-Mails:;Hunan Chemical Vocational and Technical College, Zhuzhou 412004, China; E-Mail:

关键词: Zn-Al-LDHs;    polyvinyl chloride;    stabilizer;   

DOI  :  10.3390/ijms12031756

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.