超薄钢结构水性防火涂料的研制及耐火性能

Preparation and Fire-Resistant Performance of Ultrathin Water-Borne Fire-Retardant Paint for Steel Structures

以水为溶剂制备超薄膨胀型钢结构防火涂料,有利于环保和节约成本。以垂直燃烧法评价了研制的防火涂料的耐火性能,研究了环氧改性丙烯酸乳液和苯丙乳液作基料的复配比例和用量对耐火性能的影响。试验显示,环氧改性丙烯酸与苯丙乳液质量比为2∶1,基料用量为25%时,防火涂料的性能最佳。通过正交试验研究了P-C-N膨胀阻燃体系配比对涂层耐火性能的影响,得到最佳配比为m(聚磷酸铵)∶m(季戊四醇)∶m(三聚氰胺)=5∶2∶3。通过热重和差热分析比较了添加无机阻燃剂对涂层防火性能的影响,并对防火涂料进行了热分析。结果表明:涂料各项性能符合GB 14907-2002要求,当涂层厚度为2.2 mm时,耐火时间达到90 m in。

With a view to protecting the environment and saving costs,ultrathin intumescent fire-retardant paint for steel structures was prepared by using water as a solvent.The fire-resistant performance of resultant fire-retardant paint was evaluated by making use of a vertical combustion method.The effect of ingredient ratio of epoxy modified acrylic emulsion to styrene-acrylic emulsion on the fire-resistant performance of the paint was investigated.The effect of ratio of intumescent flame retardant system of P-C-N on fire-resistant performance of the coating was examined based on orthogonal tests.Besides,the effect of inorganic fire-retardant agents on fire-resistant performance of the coating was investigated by thermogravimetric analysis and differential thermal analysis.Results indicate that the paint prepared from epoxy modified acrylic emulsion and styrene-acrylic emulsion with a ratio of 2 : 1 and dosage of 25% had the best performance.The optimized ratio for ammonium polyphosphate,pentaerythritol and melamine was determined to be 5 : 2: 3.Resultant paint had qualified performance as specified in Chinese national standard GB 14907-2002.Moreover,the fire-retardant coating with a thickness of 2.2 mm could endure up to 90 min in fire.