Zinc Hydroxystannate Coated Nano-Magnesium Hydroxide as Flame Retardant for Semirigid Poly(vinyl chloride)

Abstract

ZnSn(OH)₆ coated Mg(OH)₂ (ZHS-MOH) was synthesized by a homogeneous precipitation method with ultrasonic and azeotropic technology. The results of XRD show that the characteristic diffraction peak of ZnSn(OH)₆ advanced and the characteristic diffraction peak of Mg(OH)₂ reduced respectively with increasing of the mass ratio of ZnSn(OH)₆. The particle image of ZHS-MOH and Mg(OH)₂ was observed by TEM. TGA and DTA showed the exothermic peak tempareture of Mg(OH)₂ increased and the weight loss decreased. The ZHS-MOH was applied into semirigid PVC and it has a higher limiting oxygen index and lower SDR compared with that used Mg(OH)₂.