Abstract: Abstract：The intumescent theory of sodium tetraborate as oxidizing agent and 5-amino tetrazole was theorized， wherein a redox reaction between sodium tetraborate and 5-amino tetrazole generated boron nitride and large quantity of gas. According to this theory， fire retardant coatings for steel structure were prepared from sodium tetraborate， 5-amino tetrazole and silicon phosphate as intumescent system as well as aluminate cement as hardening agent. The coatings formula was designed by orthogonal experiment and the fire resistance time was tested by an electrothermal furnace to obtain the optimum formula. The failure mechanism of thermal protective layer was analyzed. The results showed that 5-amino tetrazole could solve the melting problem of sodium tetraborate. The heating of coating could form boron nitride thermal protective layer which had a spongy structure. The fire resistance time of the optimum formula was 1 h. The failure mechanism of the coating was the crack of thermal protective layer. The key factor to solve this problem was the type and content of aluminate cement.
王鹏, 王霁, 肖志行. 氮化硼膨胀型钢结构防火涂料的理论与实验[J]. 涂料工业, 2018, 48(9): 1-5.
Wang Peng, Wang Ji, Xiao Zhixing. The Theory and Experimental Study on Boron Nitride Intumescent Fire Retardant Coating. Paint & Coatings Industry, 2018, 48(9): 1-5.