Abstract: In order to obtain a flexible epoxy resin, a thermoplastic polyurethane elastomer (TPU) prepolymer prepared by polytetrahydrofuran ether diol (PTMEG) and diphenylmethane diisocyanate (MDI) was used to modify epoxy resin (E-51). The optimal mixing ratio of epoxy resin, TPU prepolymer and curing agent in polyurethane modified epoxy resin was obtained by testing mechanical properties such as tensile strength, elongation at break and bending strength. Microscopic properties of polyurethane modified epoxy resin were characterized by infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetry (TG) and scanning electron microscopy (SEM). The results showed that when the optimum reaction temperature of polyurethane prepolymer modified EP was 80 ℃, the content of polyurethane prepolymer was 20%, and the optimal mixing scheme of A and B components was 2∶1, the mechanical properties of the modified EP system was the best. Modified EP with surface drying time was 3.5 h, complete drying time was 9 h, tensile strength was 53.1 MPa, elongation at break was 153.34%, bending strength was 48.14 MPa, bending deformation was 13.61 mm, bonding strength was 1.89 MPa, T5% and T10% were 386.4 ℃ and 437.2 ℃, respectively, glass transition temperature was -27.9 ℃. The modification mechanism of polyurethane EP was analyzed by FTIR and SEM. It was found that the modification of polyurethane EP achieved the desired effect, and the process belonged to the category of chemical modification. This study can provide a theoretical basis for the reasonable selection of polyurethane modifier for epoxy resin.
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2023, Vol. 37 
