Effect of zinc phytate on the flame retardant of solid waste-based composite coatings
With industrial solid waste silica fume as the base material,zinc phytate(ZnPA)as the bio based flame retardant,and melamine(MEL)as the synergist,a flame retardant system was established.The silica fume based composite fire retardant coating was prepared by the sol-gel method.The effects of ZnPA content on the flame retardancy of silica fume-based composite fireproof coatings were studied using a cone calorimeter(CONE),scanning electron microscopy(SEM),thermogravimetric analysis-differential scanning calorimetry,and pyrolysis kinetics.The results showed that compared with that without ZnPA,the peak heat release rate and smoke production of the silica fume-based composite coatings with the addition of ZnPA(2.5％)were reduced by 41.83％and 42.84％,respectively.The addition of ZnPA increased the activation energy(Eα)in the range of 731～940℃ by 22.73％.The composite coating forms a non-combustible interpenetrating network structure during the combustion process,which im-proves the strength of the residual layer and effectively enhances the flame retardancy of the coating.
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