Preparation and properties of durable fluorinated acrylate-epoxy waterproof adhesive layer for steel bridge deck

The service life of steel deck pavement is far shorter than that of bridge structure due to the failure of waterproof adhesive layer. In order to prolong the service life of steel bridge deck pavement and improve the bonding condition between layers, a durable polymer waterproof bonding layer was prepared. A series of poly(butyl acrylate)-dodecafluoroheptyl methacrylate-methyl methacrylate-styrene block copolymers with different fluorine contents were synthesized by free radical solution polymerization. Five kinds of self-stratified waterproof coatings were obtained by physical blending of the above copolymers with bisphenol A epoxy resin E-51, and then they were coated on the surface of steel bridge deck to get a waterproof bonding layer after standing and drying. The self-stratification behavior of coatings in curing stage was studied by Fourier transform infrared spectroscopy, static contact angle test and scanning electron microscope. The self-stratification behavior was theoretically verified by surface energy theory. Finally, the high and low temperature properties, mechanical properties, impermeability, bonding strength and ultraviolet aging durability of the bonding layers with different fluorine contents were studied. The results show that when the fluorine content is 20wt%, the tensile strength and elongation at break reach the maximum, reaching 7.04 MPa and 128.9% respectively. At the same time, it shows the best bonding strength and ultraviolet aging durability, and the comprehensive performance reaches the best.