Abstract: On the basis of optimized formulation of polyurethane cement waterproof coating，TiO₂ was added to develop a new type of high weather resistance polyurethane/TiO₂-cement composite waterproof coatings. The coating surface morphology was characterized byscanning electron microscope，the water absorption rate was tested and tensile strength before and after treatment of UV，alkali solution，and high-temperature were measured. The resultsshowed that the properties of the composite waterproof coatings met the requirements of theGB/T 23445—2009 standard. When the mass fraction of TiO₂ was 0. 4%，the composite waterproof coating exhibited the best UV aging resistance（tensile strength retention rate of 117. 7% and the elongation retention rate at the break of 76. 2%），good alkali aging resistance and heat aging resistance，and lower water absorbing rate. 

Key words: polyurethane cement waterproof coatings, polyurethane/TiO₂-cement composite waterproof coatings, TiO₂, weather resistance

摘要： 为了提高聚氨酯水泥防水涂料的耐候性，在优化聚氨酯水泥防水涂料配方基础上引入 TiO₂作为功能性添加剂，研制了新型的高耐候聚氨酯/TiO₂-水泥复合防水涂料，探究了 TiO₂添加量对涂层耐候性和吸水率等的影响。通过扫描电子显微镜对聚氨酯/TiO₂-水泥复合防水涂层微观形貌进行表征，并系统测试了涂层经过紫外线、碱溶液、高温处理前后的拉伸性能以及涂层的低温柔性、不透水性、吸水率等。结果表明：聚氨酯/TiO₂-水泥复合防水涂料各项性能满足 GB/T 23445—2009要求，当 TiO₂质量分数为 0. 4%时，聚氨酯/TiO₂-水泥复合防水涂料表现出最佳的耐紫外老化性，拉伸强度保持率达 117. 7%，断裂伸长率保持率为 76. 2%，同时还展现出良好的耐碱老化性、耐热老化性、低温柔性、不透水性以及低吸水率。制备的聚氨酯/TiO₂-水泥复合防水涂料相较聚氨酯水泥防水涂料，耐候性提升，在户外防水领域具有潜在的应用前景。

关键词: 聚氨酯水泥防水涂料, 聚氨酯/TiO₂-水泥复合防水涂料, TiO₂, 耐候性

CLC Number: 

• TQ635. 55