叶蜡石尾矿改性水性膨胀型钢结构防火涂料的研究

Research on Water-based Intumescent Fireproof Coatings for Steel StructuresModified by Pyrophyllite Tailings

采用叶蜡石尾矿粉作为阻燃填料,以聚磷酸铵-季戊四醇-三聚氰胺作为阻燃膨胀体系,VAE乳液作为成膜物质,通过四因素四水平的正交试验,分析了叶蜡石尾矿粉和阻燃膨胀体系添加量对防火涂料性能的影响。试验结果表明,通过功效系数法和单因素平衡法分析,叶蜡石尾矿粉和阻燃膨胀体系的用量对涂料的耐火极限、粘结强度和耐水性有显著影响,其中MEL用量和叶蜡石尾矿粉用量的影响最为显著;确定了最优配方组合为A4B4C1D3,即聚磷酸铵(APP)25份,MEL 10份,季戊四醇(PER)7份,叶蜡石尾矿粉4份,此时防火涂料的综合性能最佳;确定较优配比为A3B2C4D3,即当聚磷酸铵(APP)用量为24份,三聚氰胺(MEL)用量为8份,季戊四醇(PER)用量为10份,叶蜡石尾矿粉用量为4份时,防火涂料的耐火极限最佳。

Using pyrophyllite tailings powder as flame retardant filler,ammonium polyphosphate-pentaerythritol-melamine as flame retardant expansion system,and VAE emulsion as film-forming material,the effects of pyrophyllite tailings powder and flame retardant expansion system on the properties of fire retardant coatings were analyzed by orthogonal test of four factors and four levels.The results showed that the dosage of pyrophyllite tailings powder and flame retardant expansion system had a significant effect on the fire resistance,bond strength and water resistance of the coating by the efficacy coefficient method and the single factor equilibrium method.Among them,the dosage of MEL and pyrophyllite tailings powder had the most significant effect.The optimal formula combination was determined as A4B4C1D3,that is,25 parts of ammonium polyphosphate(APP),10 parts of MEL,7 parts of pentaerythritol(PER),4 parts of pyrophyllite tailings powder,and the comprehensive performance of the fire retardant coating was the best.The optimum ratio is A3B2C4D3,that is,when the amount of ammonium polyphosphate(APP)is 24 phr,the amount of melamine(MEL)is 8 phr,the amount of pentaerythritol(PER)is 10 phr,and the amount of pyrophyllite tailings powder is 4 phr,the fire resistance of the fire retardant coating is the best.