Preparation of waterborne finishing fire-retardant paint and study on its fire retardancy
[Introduction]The composition of fire-retardant paint has great effect on its performance.[Method]A waterborne finishing intumescent fire-retardant paint for steel structures was prepared from styrene acrylic emulsion and silica sol with a composite flame-retardant system comprising ammonium polyphosphate,pentaerythritol,and melamine,titania as pigment/filler,sodium hexametaphosphate as dispersing agent,tributyl phosphate as defoaming agent,and carboxymethylcellulose as thickening agent.The effect of the mass fraction of each component on the properties of the paint was studied by big panel combustion test.The microstructure of the char layer formed after combustion was characterized by scanning electron microscopy(SEM).[Result]The optimal composition of the paint was determined as follows:styrene acrylic emulsion 20.0%,silica sol 4.0%,ammonium polyphosphate 27.0%,pentaerythritol 22.0%,melamine 21.0%,titania 4.0%,and auxiliary agents 2.0%.The paint prepared features the longest refractory time and a compact char layer after combustion.[Conclusion]The paint has good fire retardancy.
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