Flexible sealant

The invention relates to the technical field of building materials, particularly to a flexible sealant. The flexible sealant is composed of, by weight part, 10-20 parts of polyether polyol, 10-15 parts of toluene diisocyanate, 15-18 parts of hydroxyl-terminated polysiloxane, 2-5 parts of plasticizer, 7-10 parts of filler, 12-15 parts of quartz sand, 1-4 parts of inorganic pigments, 1-5 parts of defoamer, 1-5 parts of dispersant, 1-5 parts of antifreezing agent and 1-5 parts of coalescing agent. The flexible sealant has the advantages of high ductility, high elasticity, ageing resistance and high and low temperature resistance, is high in adhesion force on the contact face of the seams of ceramic tiles, and meanwhile, avoids powdering, yellowing, hardening and efficacy losing and achieves high flexibility. 本发明涉及建筑材料技术领域，尤其是一种柔性美缝剂，包括如下组分：聚醚多元醇、甲苯二异氰酸酯、端羟基聚硅氧烷、增塑剂、填料、石英砂、无机颜料、消泡剂、分散剂、防冻剂、成膜助剂，按照重量份数为：聚醚多元醇10-20份，甲苯二异氰酸酯10-15份，端羟基聚硅氧烷15-18份，增塑剂2-5份、填料7-10份、石英砂12-15份、无机颜料1-4份、消泡剂1-5份、分散剂1-5份、防冻剂1-5份、成膜助剂1-5份，该柔性美