Preparation method for flame retardant and epoxy resin composite material

A preparation method for a flame retardant, characterized by comprising following steps:

• step 1:
• weighing 1 g of MXene and dispersing it in a mixed solution consisting of 60 ml of ethanol and 240 ml of water, keeping ultrasonic stirring under low-temperature conditions, then adding 20 ml of 3-aminopropyltriethoxysilane, and keeping continuing stirring;
• after completion of the reaction, centrifugally washing with water and ethanol, respectively, to obtain modified MXene;
• step 2:
• weighing 1 g of the modified MXene prepared in step 1 and dispersing it in 50 ml of tetrahydrofuran, keeping ultrasonic stirring at a low temperature to obtain an MXene dispersion;
• step 3:
• dissolving 4 g of hexachlorocyclotriphosphazene and 11.5 g of triethylamine in 20 ml of tetrahydrofuran, and after complete dissolution, adding the above MXene dispersion and continuing ultrasonic stirring;
• step 4:
• dissolving 2.0 g of hexachlorocyclotriphosphazene and 6.0 g of p-phenylenediamine in 30 ml of tetrahydrofuran, and after dissolution, slowly adding dropwise into the mixed solution in step 3 and keeping ultrasonic stirring;
• after completion of ultrasonic stirring, placing the mixed solution in an oil bath and reacting at 50° C. for 12 h;
• step 5:
• after completion of the reaction, filtering to obtain the product, washing the product with tetrahydrofuran and water, respectively, three times, and drying the product in a vacuum oven at 50° C. to obtain the flame retardant.