Study on the gelation of foamed gel for preventing the spontaneous combustion of coal

According to the existing deficiencies in fire prevention technology,a new technique named foamed gel is developed to prevent coal mine fire efficiently. foamed gel,formed by adding the type f3 foam agent,polymer h,and al into water,introducing nitrogen and stirring physically and mechanically,is a complex multicomponent foam system. the effects of the mass fraction and mixed ratios of polymer h and polymer al blends on gelation were comprehensively studied. the results show that the optimum performance can be got when the mass fraction of blends was 0.6% and the mixed ratio was 5: 5. in addition,the interaction between molecules of these polymer blends was also investigated with the help of atomic force microscope. it can be found that the polymers h and al,through having crosslinking reaction with each other,formed three-dimensional network structures,which can not only increase the nodes of the foamed gel system but also enhance the structures. © 2014 leilin zhang and botao qin.