钛酸钾晶须改性偏高岭土基多孔地质聚合物的制备与性能

为提高多孔地质聚合物的力学强度和隔热性能，分别以双氧水（H2O2）和十二烷基硫酸钠（SDS）为发泡剂和稳泡剂，采用化学发泡法制备了由钛酸钾晶须改性的偏高岭土基多孔地质聚合物材料，对其进行了微观结构表征及性能测试。结果表明，当发泡剂和稳泡剂质量分数分别为2.0%和1.5%时，孔结构分布均匀，总孔隙率最高可达51.6%，平均孔径为0.87 mm，其抗压强度为3.63 MPa；随着钛酸钾晶须质量分数从0.0%增至10.0%时，其最高抗压强度可达4.11 MPa。在钛酸钾晶须质量分数为20%时，其最低导热系数可达0.048 W/（m?K），相比于空白样，抗压强度提高了13.22%，导热系数降低了80.80%。钛酸钾晶须的引入可以明显提高多孔地质聚合物的抗压强度和隔热性能。

Preparation and Properties of Metakaolin Based Porous Geopolymer Modified by Potassium Titanate Whisker

To improve the mechanical strength and thermal insulation performance of porous geopolymer，the metakaolin based porous geopolymer material modified by potassium titanate whisker was prepared by chemical foaming method with hydrogen peroxide and sodium dodecyl sulfate as foaming agent and stabilizing agent respectively， and its microstructure and properties were characterized. The results show that when the mass fractions of foaming agent and foaming stabilizer are 2.0% and 1.5%，respectively，the pore structure is evenly distributed，the total porosity is up to 51.6%，the average pore diameter is 0.87 mm，and the compressive strength is 3.63 MPa；When the mass fraction of potassium titanate whisker increases from 0.0% to 10.0%，its maximum compressive strength can reach 4.11 MPa. When the mass fraction of potassium titanate whisker is 20%，the lowest thermal conductivity can reach 0.048 W/（m?K）. Compared with the blank sample，the compressive strength increases by 13.22% while the thermal conductivity decreases by 80.80%. It is demonstrated that the introduction of potassium titanate whisker can significantly improve the compressive strength and thermal insulation performance of porous geopolymer.