- 目录
- 保温材料与建筑节能
- 首页
丙烯酸乳液改性玻化微珠保温砂浆性能与孔结构研究
作者：梁志远，牛云辉，吕淑珍，卢忠远，巫文静，赖振宇
（环境友好能源材料国家重点实验室，西南科技大学 材料科学与工程学院，四川 绵阳 621010）
摘要：为了避免玻化微珠在砂浆搅拌过程中结构破损导致保温性能降低的情况，利用胶乳改性玻化微珠提高其筒压强度。研究了玻化微珠掺量与水胶比、胶乳掺量对保温砂浆性能与孔结构的影响。通过扫描电子显微镜研究玻化微珠的表面形貌，利用压汞仪测量砂浆的孔径分布与特征孔径。研究表明：胶乳改性玻化微珠表面被鱼鳞状硬化胶乳层包覆，有利于玻化微珠对抗搅拌过程中的碰撞。胶乳改性玻化微珠制备的保温砂浆孔隙率达59.7%，气孔向小毛细孔转变，抗压强度达到0.89 MPa，导热系数降低30.5%，只有0.06 W/（m·K）。
关键词：胶乳；孔结构；玻化微珠；保温砂浆；表面改性
中图分类号：TU55+1.3 文献标识码：A 文章编号：1001-702X（2022）06-0046-05
Study on properties and pore structure of latex modified vitrified microsphere thermal insulation mortar
LIANG Zhiyuan，NIU Yunhui，LV Shuzhen，LU Zhongyuan，WU Wenjing，LAI Zhenyu
（State Key Laboratory of Environment-Friendly Energy Materials，School of Materials Science and Engineering，Southwest University of Science and Technology，Mianyang 621010，China）
Abstract：To avoid the decrease of thermal insulation performance caused by the structural damage of vitrified microsphere during mortar mixing，the vitrified microsphere was modified with latex to improve their cylinder pressure. The effects of vitrified bead content，water binder ratio and latex content on the properties and pore structure of thermal insulation mortar were studied. The surface morphology of vitrified microsphere was studied by scanning electron microscope，and the pore size distribution and characteristic pore size of mortar were measured by mercury porosimeter. The results show that the surface of vitrified microsphere modified by latex is coated with fish scale hardened latex layer，which is beneficial for vitrified microsphere to resist the collision during stirring. The porosity of thermal insulation mortar prepared by modified vitrified microsphere is 59.7%，the larger capillary pore become smaller，the compressive strength reaches 0.89 MPa，and the thermal conductivity decreases by 30.5% to 0.06 W/（m·K）.
Key words：latex，pore structure，vitrified microsphere，thermal insulation mortar，surface modification