Preparation of Multilayers Zinc Hydroxystannate Microcapsules and its Application in Flame-Retardant PVC Composites
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Although research on halogen free flame retardant has achieved great progress, its practical application is restricted due to high additive amount and low efficency. To solve this problem, multilayers microcapsule [melamine–formaldehyde resin (MF)/silicon dioxide (SiO2)/zinc hydroxystannate (ZHS)] was prepared through a two-step method. Moreover, when 16.40 wt% SiO2/ZHS microcapsules was mixed with poly(vinyl chloride) (PVC) matrix, the obtained PVC composites exhibited a high limited oxygen index (LOI) of 32.5%, showing its excellent flame retardancy. Furthermore, for the compatibility between MF/SiO2/ZHS microcapsules and PVC to be improved, MF was coated to SiO2/ZHS microcapsules by in situ polymerization. When 16.40 wt% MF/SiO2/ZHS microcapsules were mixed with PVC matrix, the obtained PVC composites exhibited a high LOI of 35.5%, showing its high flame retardancy. Therefore, this easily prepared multilayers microcapsule with sufficient flame retardancy in this work, it could have a potential for engineering applications.
KeywordsZinc hydroxystannate Microcapsule Flame retardancy Smoke suppression Poly (vinyl chloride)
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