聚灰比对水性聚氨酯混合砂浆保温隔热性能的影

关键字：聚灰,水性聚氨酯,混合砂浆,保温隔热

（广西建筑新能源与节能重点实验室，桂林理工大学，广西 桂林  541004）
 

    摘要：研究了聚灰比为0、3%、5%和7%时，聚氨酯混合砂浆的抗压强度、抗折强度、导热系数和孔隙率等指标，利用扫描电镜观察了聚氨酯内部封闭孔隙的成孔情况和聚合物的形貌。结果表明，随着聚灰比的增大，混合砂浆的总孔隙率、闭孔孔隙率和热阻均增大，抗压强度、抗折强度和导热系数降低，将聚氨酯掺入砂浆中引入了封闭孔隙，增强了砂浆的阻热和隔热性能。SEM分析发现，聚灰比为3%和5%的混合砂浆中存在大量纤维网状结构作为封闭孔隙的骨架，聚灰比为5%和7%的混合砂浆表面存在膜状和片状结构来支撑封闭孔隙。
    关键词：水性聚氨酯；聚灰比；孔隙率；保温隔热
    中图分类号：TU55+1        文献标识码：A        文章编号：1001-702X（2017）09-0142-04

Effect of polymer to cement ratio on thermal insulation performance of waterborne polyurethane mixture mortar
ZHAN He，YU Aiping，ZHENG Jieyu，TAN Hanming，LU Runzhi，ZHENG Yuzhen，ZHAO Wancheng，XIE Rongxian
（Guangxi Key Laboratory of New Energy and Building Energy Saving，Guilin University of Technology，Guilin 541004，China）

    Abstract：The compressive strength，flexural strength，thermal conductivity and porosity of polyurethane mixed mortar were systematically studied when the polymer to cement ratio are 0，3%，5% and 7%. This study reveals the structure and morphology of the polymer by SEM scanning electron microscopy analysis. The results indicate that the thermal resistance，total porosity and closed porosity increase and the compressive strength，flexural strength and thermal conductivity decrease in different level with the increase of the polymer to cement ratio，which is proved that the incorporation of polyurethane into mortar is helpful to improve the heat resistance and thermal insulation performance of the material. It is found that the mixed mortar with 3% and 5% polymer to cement ratio have a large number of fibrous network structures as the skeleton of closed pores. The surface of the mixed mortar with the ratio of 5% and 7% has film or plate shaped structure to support the closed porosity.
    Key words：waterborne polyurethane，polymer to cement ratio，porosity，thermal insulation