Preparation of Zinc Hydroxystannate Coated Dendritic-Fibrillar Barium Carbonate and its Flame Retardant Effect on Soft Poly (Vinyl Chloride)

Abstract

Zinc hydroxystannate (ZHS) coated dendritic-fibrillar barium carbonate (ZHS/BaCO_3-F) was obtained by a simple ultrasonic assisted method at room temperature without any guide reagent; the flame retardant soft poly (vinyl chloride) (S-PVC) treated with ZHS/BaCO_3-F was prepared by melt blending and studied by the limiting oxygen index (LOI), univeral tensile testing machine, thermogravimetric analyzer-Fourier transform infrared spectroscopy (TGA/FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that ZHS/BaCO_3-F had a good dispersion in the PVC matrix, increased the LOI value and reinforced the S-PVC. The ZHS/BaCO_3-F played its role during the first degradation stage of S-PVC; the integrated effects of the earlier dehydrochlorination of ZHS on PVC, the reaction of ZHS/BaCO_3-F and HCl, and the thermal degradation of ZHS resulted in the production of H₂O, CO₂, olefins, aryl compounds, carboxylic compounds and alcohols, and the decrease of HCl production.

Keywords:

• Flame retardant
• zinc hydroxystannate
• barium carbonate
• poly (vinyl chloride) (PVC)
• reinforcement

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Funding

The authors are grateful for financial support by the Natural Science Foundation of China (No. 21276059), the Science and Technology Project of Hebei Province (No. 13211402D) and the Natural Science Foundation of Hebei Province (No. B2014201101).