title: The effect of Zn-Al-hydrotalcites composited with calcium stearate and β-diketone on the thermal stability of PVC.
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 (CaSt(2)) 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, CaSt(2) 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 CaSt(2) and 0.25 g β-diketone in 5 g PVC.
authors.affiliation: Hunan Chemical Vocational and Technical College, Zhuzhou 412004, China; E-Mail: 13973327103@163.com.
authors.forename: Mengliang
authors.initials: M
authors.lastname: Tong
authors.forename: Hongyan
authors.initials: H
authors.lastname: Chen
authors.forename: Zhanhong
authors.initials: Z
authors.lastname: Yang
authors.forename: Runjuan
authors.initials: R
authors.lastname: Wen
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D000536:Aluminum Hydroxide / Q000737:chemistry*; D007659:Ketones / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry*; D011143:Polyvinyl Chloride / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013229:Stearic Acids / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D007659:Ketones; D013229:Stearic Acids; C010467:hydrotalcite; C031183:stearic acid; D000536:Aluminum Hydroxide; D011143:Polyvinyl Chloride; D000535:Aluminum; D015032:Zinc; D008276:Magnesium Hydroxide