【作者】 董松；

【导师】 张智强；

【作者基本信息】 重庆大学 ， 材料学， 2002， 硕士

【摘要】 建筑渗漏已成为建设工程的质量通病，它不仅扰乱人们的正常生活、工作生产秩序，而且给国家造成巨大的经济损失。因此，建筑防水在建设工程中占有十分重要的地位，对保证与发挥建筑物的使用功能与寿命具有不可低估的作用。 聚合物水泥基防水涂料是由聚合物乳液和无机填料复合而成的水乳型双组分防水涂料。涂料涂覆后，复合体系中水泥遇到乳液中的水即发生水化反应，形成一定量的水泥凝胶体；而聚合物乳液本身属于胶体分散体，其中的聚合物颗粒向料浆中分散，吸附在水泥及其水化产物和其它填料的表面。随着水分的消耗和逸失，聚合物颗粒之间慢慢地靠拢而相互凝聚在一起，进一步固化即形成连续的涂膜结构。该涂膜弥补了水泥基材料柔性不足以及聚合物乳液涂膜再溶胀，防水性差的缺陷，提高了聚合物涂料的拉伸强度。既有有机涂料高韧高弹性能，又有无机材料耐久性好等优点，达到了二者性能上的优势互补，起到“复合叠加”效应。同时它还具有粘结强度高、无毒、无味、无大气污染等优点。 本文从防水涂料料浆稳定性的研究出发，分析了影响聚合物水泥基防水涂膜性能的各种因素。它们分别是：①液粉比；②灰聚比；③成膜助剂用量；④增塑剂用量；⑤分散剂用量；⑥填料的种类；⑦水泥的品种；⑧养护龄期及制度；⑨成膜方法及厚度。结果表明：合理的液粉比和灰聚比关系到涂膜的刚性与柔性；成膜助剂有利于改善涂膜的成膜性能，提高涂膜的柔韧性；适当的增塑剂可以提高涂膜的低温柔性；分散剂能使无机填料的二次粒子充分解聚，使涂料更加均匀和稳定；不同的填料或水泥对涂膜性能也有一定程度的影响；同时，养护龄期和制度及成膜方法和厚度也影响着涂膜的拉伸性能。通过对几种防水涂料的对比，水泥的水化有利于涂膜结构的发展，使其更加致密，从而提高涂膜的耐久性。进而利用扫描电子显微镜观察了涂膜的结构和形貌；X—射线确定了水泥水化相的组成；红外光谱跟踪涂膜成膜前后各种基团的变化；对聚合物水泥基防水涂料的成膜过程和机理作出一定的假定。更多还原

【Abstract】 The leakage has become a common fault in the construction quality. It not only disturbs people normal living,working and production order,but also leads to enormous economic loss. Therefore,the building waterproofing plays an important role in the construction. In that it can effectively guarantees the construction’s function and prolongs lifespan.The polymer modified cementitious waterproofing coating,which is an emulsion and double ingredient paint,is made up of the polymer latex and inorganic fillers. After coated,the hydration will take place as soon as cement in the composite system contacts with water of the latex. Because the polymer latex is colloid dispersoid,the polymer particles disperse into slurry and absorb on cement,hydrate and other fillers. Along with the water depletes and escapes,the polymer particles close slowly and agglomerate with each other. At last,a continuous film structure comes into being. The film offsets the traditional polymer-cement composite material’s defects,such as lack of flexibility and the film’s re-solution,and enhances the tensile strength of the coating. It integrates the advantages of organic material as toughness and flexibility and advantage of inorganic material as good durability,so makes composite effect. Moreover,it has other merits,such as high bond strength,innocuity,insipidity and no atmosphere pollution.This paper studies the stability of the waterproofing coatings’ slurry and analyzes the different factors that influence the polymer modified cementitious waterproofing coatings. They include the ratio of liquid to powder(L/P),(2) the ratio of cement to polymer(C/P),(3) the dosage of coalescer,the dosage of plastizer,(5) the dosage of dispersant,the type of filler,(7) the type of cement,(8) curing age and rule,(9) the way of film formation and thickness. The results show that the rational L/P and C/P is related to rigidity and flexibility. The coalescer can improve the ability of film formation of the paint and enhance the flexibility of film. Proper plastizer can improve the low temperature performance. The dispersant makes the particles of inorganic filler disper sufficiently. As a result,the paint becomes more homogeneous and stable. Also the different types of fillers and cements can influence the performance of the coating. Moreover both the curing age,rule and the way,thickness of film-formation determine the tensile performance. By comparison with several waterproofing coatings,we find that the hydrate reinforces the film structure and improves the durability. SEM can beused to observe the structure and appearance of the film,XRD to determine the hydrate of cement,IR to analyze the variety of polymer group after coating. At last this article discusses the film-form mechanism and preparation of the waterproofing coating.更多还原