Stem-like steel frame copper market strong

To overcome the glass transition temperature of epoxy resin adhesive, brass ball valve peeling, bending, the impact of low intensity, such as the shortcomings [1], usually use of nylon, acrylonitrile-butadiene rubber, polyurethane, and so was modified, can significantly increase the peeling, bending , Impact strength [2-4]. These modified the structure of adhesive can be used as adhesives used in aircraft and automobile manufacturing [5]. Polyurethane has high impact strength and excellent low-temperature-resistant properties, but the end-isocyanate (a NCO) of excessive inconvenience to direct the use of [6]. - Epoxy polyurethane both the structural characteristics of polyurethane, and epoxy resin-with the same active groups, with its modified epoxy glue cut is likely to play a polyurethane adhesives and epoxy adhesive Advantages and complementary weaknesses, both have a certain flexibility, but also has a bond strength of a better brass ball valve adhesive. Brass is considered more difficult bonding material, the paper on the epoxy-modified polyurethane epoxy adhesive bonding properties of the brass (shear strength) done a preliminary study. Epoxy resin, Shanghai speculation fat Ltd.; propylene oxide polyether, Shanghai Gaoqiao Petrochemical Factory; curing agent, East China University of Technology chemical plants; brass ball valve shrink even oil, self-made; toluene diisocyanate (TDI) . 80/20, into 171; yellow copper, 6 = 3 mm, China.