Abstract: Using sodium dodecyl benzene sulfonate (SDBS) as a template in the mixed solution of glycol and water, zinc hydroxystannate-coated calcium carbonate (ZHSCC-1) was prepared. Zinc hydroxystannate-coated calcium carbonate (ZHSCC-2) was prepared in an aqueous solution without SDBS/glycol for comparison. Both ZHSCC-1 and ZHSCC-2 were studied as the flame retardant of PVC. XRD, SEM, and TG-DSC showed that zinc stannate was coated on CaCO3 surface and the product was thin hexagonal pieces with the size about 5 μm. At the same loading, not only the flame retardant and smoke suppressant effects, but also the tensile strength, elongation at break, and impact strength of ZHSCC-1-based PVC were better than those of ZHSCC-2-based system.

Key words: poly(vinyl chloride), zinc hydroxystannate, template control, calcium carbonate, flame retardant