建筑表面胶粘剂结合层防水性研究

Study on waterproof performance of adhesive bonding layer on building surface

选择A、B、C三类贴块试样,分别涂覆1~2层含氟水性聚氨酯丙烯酸酯胶粘剂(WPUA)、醋酸乙烯-丙烯酸丁酯-丙烯酰胺(VAc-BA-AM)三元共聚乳液胶粘剂、水泥。以扫描电镜(SEM)和透射电镜(TEM)检测结果为依据,进行吸水率、阻水性、渗水性、剪切性和界面拉拔性等防水性能试验研究。研究结果表明:涂覆WPUA胶粘剂的试样吸水率显著低于涂覆水泥试样,且浸水20 d后,涂覆双层WPUA的A和B类贴块的吸水率仅为控制组的5.8%和5.1%;涂覆双层WPUA试样在水压力0.1~0.3 MPa下,1 h内无渗水现象且应力无减弱,而涂覆双层VAc-BA-AM三元共聚乳液胶粘剂和水泥的试样均有不同程度渗水和应力减弱;涂覆三种防水粘接材料试样的抗拉性能、抗剪性能对高温敏感性大小依次为:WPUA>VAc-BA-AM三元共聚乳液胶粘剂>水泥;WPUA胶粘剂防水性能较佳,无论是在吸水率和阻水性试验、剪切试验、拉拔试验和渗水试验中,都比另外两种防水粘接材料的防水性能强,因此WPUA胶粘剂可作为防水粘接材料用在建筑表面贴块结合层。

Three types of patch samples,i.e.A,B and C were selected and coated with 1-2 layers of fluorinecontaining waterborne polyurethane acrylate adhesive(WPUA),vinyl acetate-butyl acrylate-acrylamide(VAc-BAAM)ternary copolymerized emulsion adhesive and cement,respectively.Based on the results of scanning electron microscopy(SEM)and transmission electron microscopy(TEM),the water absorption,water resistance,water permeability,shearing properties and interface pull-out properties were investigated.The research results showed that the water absorption rate of the sample coated with WPUA adhesive was significantly lower than that of the sample coated with cement,and after immersion in water for 20 days,the water absorption rate of the A and B patch coated with double-layer WPUA was only 5.8%and 5.1%of the control group.Under the water pressure of 0.1-0.3 MPa,the sample coated with double-layer WPUA had no water seepage and the stress was not weakened within1 h,while the sample coated with double-layer VAc-BA-AM ternary copolymerized emulsion adhesive and cement had different degrees of water seepage and stress reduction.The sensitivity of tensile properties and shear properties of the sample coated with three waterproof adhesive materials to high temperature was in the following order:WPUA>VAc-BA-AM ternary copolymerized emulsion adhesive>cement.The waterproof performance of WPUA adhesive was better than that of other two waterproof bonding materials in water absorption and water resistance test,shear test,pull-out test and water seepage test.Therefore,WPUA adhesive could be used as the waterproof bonding material for building surface bonding.