Abstract: All buildings are mandatorily required to install insulation measures between the exterior wall structural layer and the decorative layer. The exterior wall insulation layer can effectively reduce building energy consumption. To enhance the thermal resistance performance of inorganic fireproof insulation mortar, this study, based on previous research findings, further introduced AOS foaming agent and gelatin to develop a novel foam insulation mortar. While conducting research on the foaming process, the fire resistance of the mortar was also tested. The results indicate that: the optimal foaming effect is achieved when the stirring time is between 5~6 minutes; when the AOS volume fraction in the foaming solution is approximately 1.5%, the generated foam exhibits the highest stability. A gelatin volume fraction of 1.5% in the foaming solution provides better foam stabilization effect, significantly enhancing foam stability. After optimization, the optimal dosages of foaming agent and stabilizing agent were determined to be 1.75% and 1.00%, respectively. The incorporation of foaming agent and gelatin can introduce independent closed-cell pore structures into the insulation mortar, thereby significantly reducing the dry density and thermal conductivity of the mortar. However, it will also have a negative impact on the mechanical properties of the mortar, with particularly significant weakening of the bonding strength.

Key words: fireproof insulation mortar, fire resistance, foaming agent, gelatin foam stabilization