水性聚合物改性沥青防水涂料的制备及性能研究  

Preparation and performance of waterborne polymer modified asphalt waterproof coating

作　　者：顾锡丽 GU Xili(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《新型建筑材料》2024年第6期144-149,共6页New Building Materials

摘　　要：选用马来酸酐(MAH)和SBS作为沥青改性剂制备MAH接枝SBS改性沥青,然后再乳化得到改性乳化沥青,并将其与聚合物乳液、填料及各种助剂进行复配制得水性聚合物改性沥青防水涂料。结果表明:当反应6 h后,顺酐化沥青接枝率最高;随着SBS掺量增加,MAH接枝SBS改性沥青的软化点、针入度、黏度、拉伸性能以及低温性能均有所提高,且形成连续网状结构,考虑成本和乳化工艺因素,建议SBS掺量为5%;制备的改性乳化沥青放置6个月后储存稳定性仍达到96.7%;当聚合物乳液用量为30%时,防水涂料表现出较好的耐高低温性能及力学性能;云母粉能够明显降低涂料吸水率,无机类增稠剂硅酸镁铝能有效降低涂膜吸水率且能保持良好的抗流挂性和稳定性,聚醚改性有机硅类消泡剂能起到很好的消泡效果,当用量为0.2%时,涂膜表面光亮平整。MAH grafted SBS modified asphalt was prepared by using maleic anhydride(MAH)and styrene butadiene styrene block copolymer(SBS)as asphalt modifier,and then emulsified to obtain modified emulsified asphalt,which was compounded with polymer lotion,filler and various additives to obtain water-borne polymer modified asphalt waterproof coating.The results showed that after 6 hours of reaction,the grafting rate of maleic anhydride asphalt was the highest;With the continuous increase of SBS content,the softening point,penetration,viscosity,tensile performance,and low-temperature performance of MAH grafted SBS modified asphalt have all been improved,and a continuous network structure has been formed.Considering cost and emulsification process factors,it is recommended that the SBS content be 5%.The prepared modified emulsified asphalt has good storage stability,and the storage stability still reaches 96.7%after 6 months of storage.When the addition of polymer lotion is 30%,the coating product shows good high and low temperature resistance and mechanical properties.The use of mica powder can significantly reduce the water absorption rate of coatings.At the same time,the use of inorganic thickeners(magnesium aluminum silicate)can effectively reduce the water absorption rate of coatings and maintain good anti sagging and stability.Polyether modified organosilicon defoamers can have a good defoaming effect.When the addition amount is 0.2%,the surface of the coating is bright and flat.

关 键 词：马来酸酐 SBS改性沥青 改性乳化沥青 聚合物乳液 防水涂料 

分 类 号：TU561.65[建筑科学—建筑技术科学]