以硬脂酸钙为主稳泡剂制备轻质发泡水泥保温板,通过考察硬脂酸钙对发泡水泥泡沫稳定性、疏水性和泡孔结构等影响,提出硬脂酸钙在化学发泡水泥中的稳泡机制.研究结果表明:硬脂酸钙在化学发泡水泥中的稳泡机制为硬脂酸钙吸附在水泥颗粒表面使其呈现部分疏水性,进而吸附在气泡的气液界面上使泡沫达到稳定.优化稳泡剂成分和用量所制备的高性能轻质发泡水泥保温板符合国家标准要求,产品密度为220 kg/m3,抗压强度为0.63 MPa,导热系数为0.042 W/(m·K),体积吸水率为9.8%.%Light weight foam cement thermal insulation board was prepared by using self-made composite foam stabilizer with calcium stearate as principal component. The foam stabilizing mechanism of the calcium stearate in chemical foaming cement was proposed by studying the effects of calcium stearate on foam stability, hydrophobicity and pore structure. The results show that the foam stabilizing mechanism is that cement particles are firstly absorbed by calcium stearate and then partly presented hydrophobic, and subsequently they are absorbed on gas-liquid interface of the bubbles to achieve a stable equilibrium state of the bubbles. The as-prepared lightweight foam cement thermal insulation board using self-made composite foam stabilizer meets the requirements of the national standard. The absolute dry density is 220 kg/m3, the compressive strength reaches 0.63 MPa, the thermal conductivity is 0.042 W/(m·K) and the water absorption rate after 28 d of curing period is only 9.8%.
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