Preparation And Properties Of Modified HTBN Polyurethane Elastomer

In this paper, the polyurethane elastomer having hydroxyl-terminated polybutadiene respectively-acrylonitrile (HTBN) were prepared with prepolymer method. This polyurethane elastomer had excellent mechanical properties, the resistance of salt water and solvent. Experimental conditions was ascertained from the treatment of the experimental materials, the experimental temperature, the content of NCO and the dosage of 3,5-dimetylthio-2,4-diaminotoluene or 3,5-dimetylthio-2,6-diaminotoluene (DMTDA, E-300). The polyurethane elastomer was preparationed by changing the type and amount of polyether, the type of isocyanate, the type of extension, the type and content of filler.The polyurethane elastomer structure and properties were analyzed and characterized by Fourier Transform Infrared Spectroscopy (FTIR), Hermogravimetric Analysis (TG), Dynamic Tthermal Mechanical Analysis (DMA), Scanning Electron Microscopy (SEM), Electronic Universal Testing Machines and other methods.The first, the polyurethane elastomer was prepared by the different ratio of HTBN and polyethylene glycol (Mw:1000, 2000), polyethylene glycol ether tetrahydrofuran (Mw:1000, 2000). The mechanical properties, thermodynamic properties and dynamic mechanical properties were characterized. The results showed that: the HTBN polyurethane elastomer had excellent of temperature performance, the maximum decomposition temperature was about 450℃, when the mass ratio of HTBN/PTMG-1000 was 35:65, NCO% was 6.0%, the molar ratio of NCO/NH₂ was 1.05, using E-300 as chain extender, toluene diisocyanate (T-100) was selected as isocyanate, polyurethane elastomer obtained the excellent performance, the maximum tensile strength could reach 38. 87MPa.The second, the polyurethane elastomer wsa prepared by toluene diisocyanate (T-100), diphenylmethane diisocyanate (MDI), phenylene diisocyanate (PPDI) and isophorone diisocyanate (IPDI). Its'mechanical properties, thermodynamic properties and dynamic mechanical properties were characterized. The results showed that: PPDI as the hard segment of the polyurethane elastomer's mechanical and thermal properties was the most outstanding, the maximum tensile strength could reach 48.23MPa.The third, 3,5-dimetylthio-2,4-diaminotoluene or 3,5-dimetylthio-2,6-diaminotoluene, 1,4-butanediol (1,4-BD), ethanolamine, diethanolamine and triethanolamine were used as a chain extender preparation of polyurethane elastomer. The experimental results showed that: E-300 extended chain was the best performance of the polyurethane elastomer.The fourth, useing SiO₂ and glass fiber reinforced polyurethane elastomer, the experimental showed that: glass fiber reinforced polyurethane elastomer tensile strength increased by 7.05 MPa, the glass fiber coupling agent polyurethane elastomers enhance the better.Finally, the experimental studies of the solvent and salt water resistance with polyurethane elastomer, we found: HTBN polyurethane elastomer had excellent resistance to salt water and xylene.