Synthesis of Elastic Polyurethane Resin Containing Polycaprolactone as Soft Segment
Elastic polyurethane resin has excellent elastic properties and other mechanical properties,and plays a vital role in radome coatings and rubber coatings.In this paper,polycaprolactone resins PCL1000/2000 with different molecular weights are successfully synthesized to replace the Daicel products PCL-210N/220N.The chemical structures and molecular weights of the prepared resins are determined by Fourier transform infrared spectroscopy(FTIR)and proton nuclear magnetic resonance spectroscopy(1H NMR)and gel permeation chromatography(GPC)were characterized.The effects of different diol polymer resins as linear soft segments and molar ratio of NCO/OH on the elastic properties of NCO-terminated prepolymers are studied.The effect of cross-linking and curing of different hydroxyl resins,amino resins or epoxy resins and NCO-terminated prepolymers on the elastic properties and other mechanical properties are also studied.The results show that the NCO-terminated prepolymer which the polycaprolactone resin PCL-1000/2000 is selected as the soft segment and the NCO/OH molar ratio is 1.5 is cross-linked and cured with polyaspartate.The elongation is greater than 400％,the strength is greater than 15 MPa,and other mechanical properties(adhesion,wear resistance)are excellent.
NETL
NSTL
万方数据
