High-efficiency flame-retardant modified melamino-formaldehyde foams and preparation method thereof

The invention discloses high-efficiency flame-retardant modified melamino-formaldehyde foams. The high-efficiency flame-retardant modified melamino-formaldehyde foams are obtained by performing layer-by-layer self assembling through an alternating reaction formed by soaking or spraying of a positive electrolyte aqueous solution and a negative electrolyte aqueous solution based on a layer-by-layer self-assembling technology, and are deposited on the surface of a foam hold skeleton to form multiple layers of stable flame-retardant films, wherein the limit oxygen index is 35.5 to 46.5%; thermogravimetric residual weight at 700 DEG C and under nitrogen atmosphere is 26.7 to 32.8%; under the condition of cone calorimetric test with the power of 50 kW and in the process of from that the foam can be ignited to that the foam cannot be ignited, heat release peak value is 9.8 to 78.8 kW/m ; the foam is difficult to shrink at continuous high temperature of 750 DEG C. The flame-retardant films on the obtained melamino-fo