Preparation and High Temperature Resistance of a Novel Aqueous Foam for Fire Extinguishing

In order to effectively prevent the fire, the experiment on the preparation of aqueous foam with high stability was carried out based on the analysis of the current characteristics of the foaming agent. When the SDS and AES solutions were added with RPP, PAM and LA, the foaming heights all higher than the single SDS or AES solution. But the half-time changed up and down. Based on the FCI, the biggest value of FCI is 10762.50, and its corresponding compound solution is composed of 2.5g/L AES+1.5g/L PAM+4.0g/L SAP. The formation mechanism of the novel aqueous foam consist of the PAM particles irreversibly adsorb at the gas-liquid interface, PAM can associate with micelles to result in an increase in the charge of PAM macromolecules and an increase in system viscosity, AES ionization of Na+ further increased the Na+ concentration in the SAP grid and promoted the water absorption. When the temperature is 135℃, it began to have a small amount of water evaporation and the foaming height began to decline. The water evaporation rate increased with the temperature. Through the change of viscosity, it is concluded that the prepared aqueous foam can still maintain the foam form at 220℃.