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以正硅酸乙酯、磷酸二氢铵、尿素、季戊四醇、氯化镧制备硅-磷-镧复合阻燃材料,基于正交设计与BP神经网络方法研究了阻燃体系与正硅酸乙酯的质量比(因素A),阻燃体系中磷酸二氢铵、季戊四醇和尿素三者的质量比(因素B),氯化镧与正硅酸乙酯的质量比(因素C)和硅胶溶液的pH值(因素D)4个因素对复合阻燃材料阻燃性能的影响。对复合材料的制备方案进行了优化并对最佳条件下材料的性能进行了表征。结果表明,各因素对阻燃性能影响的主次顺序为:因素A>因素D>因素B>因素C;最优制备配方:正硅酸乙酯∶磷酸二氢铵∶季戊四醇∶尿素∶氯化镧为1∶0.191∶0.131∶0.065∶0.0347(wt,质量比),硅胶溶液的pH=6.32;硅-磷-镧阻燃材料中的次磷酸盐可以促进致密炭层的形成,抑制能量交换,提高阻燃体系的阻燃性能。
Si-P-lanthanum composite fire retardants were prepared by using tetraethoxysilane, diammonium phosphate, urea, pentaerythritol and lanthanum chloride. The effects of flame retardant system and ethyl orthosilicate (Factor A), mass ratio of ammonium dihydrogen phosphate, pentaerythritol and urea in the flame retardant system (factor B), mass ratio of lanthanum chloride to tetraethyl orthosilicate (factor C) and silica gel solution Effect of Four Factors on Flame Retardancy of Composite Flame Retardant Materials. The preparation of composite materials was optimized and the properties of the materials under the optimum conditions were characterized. The results showed that the main order of influence of each factor on the flame retardancy was: factor A> factor D> factor B> factor C; optimal preparation formula: TEOS: ammonium dihydrogen phosphate: pentaerythritol: urea: Lanthanum is 1: 0.191: 0.131: 0.065: 0.0347 (wt, mass ratio), the pH value of the silica solution is 6.32. The hypophosphite in the silicon-phosphorus-lanthanum flame retardant material can promote the formation of the dense carbon layer, inhibit the energy exchange, Improve flame retardant system flame retardant properties.