聚苯颗粒复合保温砂浆的制备及性能研究  

Preparation and performance study of polystyrene particlecomposite insulation mortar

作　　者：范晔 FAN Ye(College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Qijian Decoration Engineering Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]甘肃第七建设集团股份有限公司,兰州730000

出　　处：《功能材料》2024年第9期9164-9171,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(813602543);甘肃省建设科技科研项目(JK2023-27)。

摘　　要：以聚苯乙烯颗粒(EPS)为砂浆的增强相,先通过三乙醇胺对聚苯颗粒进行表面处理,然后制备出聚苯颗粒复合保温砂浆,研究了三乙醇胺用量对聚苯颗粒水接触角的影响,并探究了其对复合保温砂浆力学性能、微观形貌、干缩性能和导热性能的影响。结果表明,三乙醇胺改性处理降低了聚苯颗粒的水接触角,聚苯颗粒由疏水性转变为亲水性。三乙醇胺用量的增加降低了复合保温砂浆的稠度,增大了干密度,EPS-5%试样的稠度最低为8.8 cm,干密度最高为237 kg/m 3。随着三乙醇胺用量的增加,复合保温砂浆的吸水率先降低后逐渐趋于平稳,抗压强度、抗折强度、压剪粘接强度和软化系数均先增大后降低,干燥收缩率和导热系数先减小后增大。EPS-5%试样的吸水率最低为0.62%,软化系数最大为0.63,该试样在28 d龄期的抗压强度、抗折强度和压剪粘接强度达到最大值,分别为2.05,0.64和0.26 MPa。在7 d时,EPS-5%试样的干燥收缩率最低为0.0385%,导热系数最低为0.045 W/(m·K),保温性能最优。Using polystyrene particles as the reinforcing phase of mortar,surface treatment of polystyrene particles was first carried out through triethanolamine,and then polystyrene particle composite insulation mortar was prepared.The effect of triethanolamine dosage on the water contact angle of polystyrene particles was studied,and its influence on the mechanical properties,microstructure,drying shrinkage performance and thermal conductivity of composite insulation mortar was explored.The results showed that the modification treatment with triethanolamine reduced the water contact angle of polystyrene particles,and the polystyrene particles changed from hydrophobic to hydrophilic.The increase in the amount of triethanolamine reduced the viscosity of the composite insulation mortar and increased the dry density.The lowest viscosity of the EPS-5%sample was 8.8 cm,and the highest dry density was 237 kg/m 3.With the increased of triethanolamine dosage,the water absorption of composite insulation mortar first decreased and then gradually stabilized.The compressive strength,flexural strength,shear bonding strength,and softening coefficient all increased first and then decreased,while the drying shrinkage rate and thermal conductivity first decreased and then increased.The water absorption rate of the EPS-5%sample was the lowest at 0.62%,and the softening coefficient was the highest at 0.63.The compressive strength,flexural strength,and shear bond strength of the sample reached their maximum values at 28 d of age,which were 2.05,0.64,and 0.26 MPa,respectively.At 7 d,the drying shrinkage rate of EPS-5%sample was the lowest at 0.0385%,and the thermal conductivity was the lowest at 0.045 W/(m·K),indicating the optimal insulation performance.

关 键 词：聚苯颗粒 三乙醇胺 保温砂浆 亲水改性 干缩性能 导热系数 

分 类 号：TU528.062[建筑科学—建筑技术科学]