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采用X射线光电子能谱、热失重分析法及粒度分析法研究了拜耳法赤泥表面的元素组成、热稳定性及粒度分布;采用复配协同阻燃的方法,将拜耳法赤泥分别与微胶囊红磷、聚磷酸铵、硼酸锌、氢氧化镁等阻燃剂复配,研究了赤泥复配阻燃剂用于聚乙烯的阻燃效果。研究表明,拜耳法赤泥表面含有铝、硅、磷及氮等多种阻燃元素,热稳定性及粒度均可满足阻燃塑料的基本要求,质量分数为50%的拜耳法赤泥阻燃聚乙烯的氧指数为20.8%。在增容剂接枝马来酸酐聚乙烯存在下,赤泥复配阻燃聚乙烯的氧指数达到了30.3%,力学性能基本满足应用需求。
The elemental composition, thermal stability and particle size distribution of the red mud on the Bayer process were studied by X-ray photoelectron spectroscopy, thermogravimetric analysis and particle size analysis. The synergistic flame retardant method was used to combine the Bayer red mud with the micro Capsules red phosphorus, ammonium polyphosphate, zinc borate, magnesium hydroxide and other flame retardants compound to study the red mud compound flame retardant for polyethylene flame retardant effect. The results show that Bayer process red mud surface contains a variety of flame retardant elements such as aluminum, silicon, phosphorus and nitrogen, thermal stability and particle size can meet the basic requirements of flame retardant plastics, the mass fraction of 50% Bayer red mud flame retardant The oxygen index of polyethylene is 20.8%. In the presence of compatibilizer grafted maleic anhydride polyethylene, the oxygen index of the red mud composite flame retardant polyethylene reached 30.3%, and the mechanical properties basically met the application requirements.