The Synthesis Of Polyurethane Epoxy Terminal Adhesive Applied Research

In this paper, a new reactive epoxidized polyurethane has been prepared, and a epoxy adhesive modified by the epoxidized polyurethane also has been studied systemically. The modified adhesive possesses excellent performance of physical mechanical and chemical corrosion resistance. The paper contains three parts as follows.(1) Glycidol has prepared successfully from 3-chloro-1,2-propanediol and alkaline compound. The structure of the glycidol is determined by FTIR . Abbe refractometer and chemical analysis are employed to test the purity. Otherwise, The influencing factors of the output of glycidol are studied in different systems, and the condition of this reaction has also been optimized. The optimal conditions: The solvent is isopropyl alcohol, the concentration of sodium hydroxide is 37%, the reacting time is 50min, the absorbing reagent is anhydrous bitter salt . The yield of the glycidol is arrived at 80%.(2) The epoxidized polyurethane has been synthesized with the glycidol and the isocyanate terminated polyurethane resin mentioned above. The structure of the varied epoxidized polyurethane are analyzed with infrared ray spectrum. The temperature of the terminated reaction, the thermodynamics stability and the viscosity of the polyurethane during the stockpile are tested. The best result can be got at 70℃and 6h.(3) In order to improve the epoxy resin's capability, the epoxy adhesive modified with epoxidized polyurethane was studied systemically. The effects of varieties, such as the mixing proportion between the epoxidized polyurethane and epoxy resin, the kind and dosage of the curing agent, the solidify condition, the mixing proportion between filling agent and resin, the surface preparation on physical mechanical capability are investigated. Meanwhile, the chemical corrosion and the water-fast capability are tested and the reasons why properties have improved are analyzed.