Preparation and Performance Study of Flame-Retardant Wa-terborne Polyurethane with Synergistic Effects of DOPO Derivatives and APP
Due to the poor compatibility between ammonium polyphosphate(APP)flame retardant and anion polyurethane,the resulting polyurethane still produces a large number of droplets when burned.Phosphorus-based flame retardants were used to modify anion waterborne polyurethane for flame retardant enhancement.The optimal dosage of the two flame retardants,APP and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO)derivatives(DOPO-PHB),and an economically efficient flame-retardant modification system were investigated.The flame retardancy and thermal degradation performance were examined through limiting oxygen index(LOI),vertical burning test,and thermogravimetric analysis.The mechanical properties of the resulting film were determined using a tensile testing machine.Results indicate that a LOI value of 27.8％and a V-0 rating in the vertical burning test were achieved when 1％APP and 4％DOPO-PHB were added.Without melting drops,the mechanical properties of polyurethane were improved,and its compatibility was enhanced.
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