Spherical cobalt hydroxystannate was prepared and characterized by X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, and thermogravimetric analyzer–Fourier-transform infrared spectroscopy. Results showed that cobalt hydroxystannate spheres have an average particle size of 440 nm and disperse uniformly. The flame-retardant flexible poly(vinyl chloride) treated with cobalt hydroxystannate was studied by the limiting oxygen index, universal tensile testing machine, thermogravimetric analyzer–Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and laser Raman spectra methods. Compared with the pure poly(vinyl chloride), the limiting oxygen index value of the poly(vinyl chloride) sample (PVC/10) treated with 10 phr of cobalt hydroxystannate is increased by 4% points, and its total heat release and total smoke production decreased by 18% and 50%, respectively. The result could be attributed to the water produced by the dehydration of cobalt hydroxystannate, and the interaction of cobalt hydroxystannate and the poly(vinyl chloride) matrix, which produces dense and highly graphitized char residue containing hexagonal phase graphite, CoCl2, Co2O3, and Co3O4.

中文翻译：

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球形羟基锡酸钴的制备及其在聚氯乙烯中的阻燃抑烟作用

制备了球形羟基锡酸钴，并通过 X 射线衍射、扫描电子显微镜、傅里叶变换红外光谱和热重分析仪-傅里叶变换红外光谱对其进行了表征。结果表明，羟基锡酸钴球体的平均粒径为 440 nm，分散均匀。采用极限氧指数、万能拉伸试验机、热重分析仪-傅里叶变换红外光谱、扫描电子显微镜、X射线衍射和激光拉曼光谱等方法研究了羟基锡酸钴处理的阻燃柔性聚氯乙烯. 与纯聚氯乙烯相比，用10份羟基锡酸钴处理的聚​​氯乙烯样品（PVC/10）的极限氧指数值提高了4个百分点，其总放热量和总发烟量分别下降了 18% 和 50%。结果可能归因于羟基锡酸钴脱水产生的水，以及羟基锡酸钴与聚（氯乙烯）基体的相互作用，产生了致密且高度石墨化的含六方相石墨、CoCl2、Co2O3 和 Co3O4 的炭渣.