Preparation of Mg-Al hydrotalcite foam retardant and its inhibition characteristics study

LI Shengli; ZHANG Leilin

doi:10.13347/j.cnki.mkaq.20231427

Abstract：In order to prevent coal spontaneous combustion,Mg-Al hydrotalcite foam with high stability and good flame retardant ef-fect was prepared by using surfactant,foam stabilizer and Mg-Al hydrotalcite(HT)in a certain proportion.The optimum formula of Mg-Al hydrotalcite foam was determined by orthogonal test and Waring-Blender method.The inhibition characteristics were tested by temperature programmed device and cone calorimeter test.The results show that when the mass fraction of surfactant Silok8022 is 0.03%,the mass fraction of AOS is 0.1%,the mass fraction of LAMC is 0.075%,the mass fraction of foam stabilizer HEC is 0.05%,the mass fraction of flame retardant HT is 1%,the performance of Mg-Al hydrotalcite foam is the best.In terms of low tem-perature inhibition,the inhibition rate of HT foam reached 68.4%,and the CO volume fraction of coal samples added with HT foam at 200 ℃ was 36.9%lower than that of raw coal.In terms of high temperature combustion,the peak heat release rate of coal samples treated with HT foam decreased from 74.59 kW/m2 to 43.48 kW/m2,and the total heat release decreased from 9.98 MJ/m2 to 7.15 MJ/m2.Compared with MgCl2 and AFFF,HT foam showed excellent flame retardant effect on coal.It was found that the content of aliphatic hydrocarbons and oxygen-containing functional groups in coal samples with HT foam was significantly reduced,indicating that HT foam had a strong inhibitory effect on coal spontaneous combustion.