矿用双网络凝胶防灭火特性研究

Study on fire preventing and extinguishing characteristics of mine-used dual network gel

针对单网络凝胶防灭火材料存在交联强度低、机械性能差、结构容易被破坏等问题,引入2种相互作用来构筑双重物理交联网络结构,制备了全物理交联Al^(3+)-CMC/MMT-PAM双网络防灭火凝胶;通过对不同配比下凝胶的成胶时间测试,选出适合煤自燃火灾防治的凝胶配比,胶凝时间需控制在4~7 min;采用程序升温氧化实验、热分析(TG-DSC)、堵漏风性能测试、扫描电镜等对凝胶的阻化性能进行研究。结果表明:经凝胶处理的煤样失重率整体降低,总放热值明显下降,活化能提高,加大了煤自燃难度;经凝胶处理后,CO、CO_(2)释放量减少,阻化率与温度变化总体上呈负相关,交叉点温度均有所提高;胶凝过程可控,可在5 min内较好的充填碎煤空隙。

In view of the problems of low cross-linking strength,poor mechanical performance and easy damage of the structure of single network gel fire preventing and extinguishing materials,two interactions are introduced to construct a dual physical cross-linking network structure,and the Al^(3+)-CMC/MMT-PAM dual network fire preventing and extinguishing gel is prepared,through the gelling time test of the gel under different ratios,the gel ratio suitable for coal spontaneous combustion fire prevention is selected,and the gelling time should be controlled at 4-7 min.The resistance performance of the gel was studied by program heating oxidation experiment,thermal analysis(TG-DSC),air plugging performance test and SEM,and the results show that:the weightlessness rate of gel-treated coal samples is reduced overall,the total calorific value is decreased significantly,and the activation energy is improved,which increases the difficulty of coal spontaneous combustion;after gel treatment,the release of CO and CO_(2) decreases,the resistance rate and temperature change are negatively related,and the intersection temperature increases;the coagulation process is controllable,and the coal gap can be filled within 5 min.