摘要
采用溶液共混法制备了多孔聚氨酯注浆材料,以纳米SiO2为增强相,研究了改性多孔注浆基材料的结构形貌、力学性能、阻燃性能和导热性能,研究结果表明:纳米SiO2掺杂后与聚氨酯基体发生了键合,增强了多孔注浆材料的孔壁强度,形态结构更加完整,多孔注浆材料的拉伸强度和粘接强度得到了改善,并随纳米SiO2掺杂量的增大呈现出先增大后降低的趋势,纳米SiO2掺杂量0.8%的多孔注浆材料的拉伸强度和粘接强度均达到了最大值。随纳米SiO2掺杂量的增加,多孔注浆材料的最高蓄热温度先降低后升高,降温速率先增加后降低,导热系数持续增加。阻燃测试表明:0.8%纳米SiO2掺杂的注浆材料的垂直燃烧时间最短为20.8 s,阻燃性能最优。综合各性能来看,纳米SiO2最佳掺杂量为0.8%,该掺杂比例下多孔注浆基材料最高蓄热温度为143℃,降温速率为1.75℃/min,导热系数为0.368 W/(m·K),垂直燃烧时间为20.8 s,在隧道防火应用方面具有广阔的应用前景。
In this paper, the porous polyurethane grouting material was prepared by solution blending method. The nano-SiO2was used as the reinforcing phase to study the structure, morphology, mechanical properties, flame retardancy and thermal conductivity of the modified porous grouting-based material.The results show that: After the nano-SiO2doping, it is bonded with the polyurethane matrix, which enhances the pore wall strength of the porous grouting material, makes the morphological structure more complete, and improves the tensile strength and viscosity of the porous grouting material. The increase of the amount shows a trend of first increase and then decrease.The tensile strength and viscosity of the porous grouting material with nano-SiO2doping content of 0.8% both reach the maximum value. With the increase of nano-SiO2doping content, the maximum heat storage temperature of porous grouting material first decreased and then increased, the cooling rate increased first and then decreased, and the thermal conductivity continued to increase. The flame retardant test shows that the vertical burning time of the 0.8% nano-SiO2doped grouting material is the shortest 20.8 s, and the flame retardant performance is the best.From the perspective of various properties, the optimal doping amount of nano-SiO2is 0.8%. Under this doping ratio, the maximum heat storage temperature of the porous grouting-based material is 143 ℃, the cooling rate is 1.75 ℃/min, and the thermal conductivity is 0.368 W/(m · K), the vertical burning time is20.8 s, and it has broad application prospects in tunnel fire protection applications.
作者
杨念东
刘胜
徐天勇
陈代果
Yang Niandong;Liu Sheng;Xu Tianyong;Chen Daiguo(Xianning Fire and Rescue Division,Hubei Xianning 437100,China;CAS Key Laboratory of Mechanical Behav-ior and Design of Materials,University of Science and Technolo-gy of China,Anhui Hefei 230026,China)
出处
《消防科学与技术》
CAS
北大核心
2023年第1期34-37,共4页
Fire Science and Technology
基金
国家自然科学基金项目(12002293)。
关键词
溶液共混法
聚氨酯
多孔注浆材料
力学性能
阻燃性能
导热性能
solution blending method
polyurethane
porous grouting material
mechanical properties
flame retardant properties
thermal conductivity
