Preparation and properties of non-isocyanate polyurethane curing agent
The cyclic carbonate compound(RDGEC)was synthesized by using resorcinol diglycidyl ether as raw material through CO2 insertion method.A series of non-isocyanate polyurethane(NIPU)curing agent was prepared by polymerizing it with polyether amine(D230)and adjusting the ratio of reactants.The curing kinetics of the blended system of NIPU and bisphenol A epoxy resin(E-51)was investigated in details,and the bonding properties,thermal mechanical properties,thermal stability,and fracture surface microstructure of cured samples were studied.The research results showed that RDGEC and NIPU curing agent were prepared successfully.Adjusting the reaction ratio of RDGEC and D230 had little effect on the curing reactivity of NIPU,but the toughness degree of the curing system could be effectively changed,and the curing process was determined to be 50 ℃/2 h+100 ℃/2h.The blended curing system of NIPU and E-51 had excellent bonding properties on aluminum alloy.When adjusting the ratio of RDGEC and D230 to 1∶1.75,the shear strength at 25 ℃ and 70 ℃ were 36.98and 14.51 MPa,respectively,the 90° peel strength at 25 ℃ reached 6.08 kN/m,with the bonding properties reaching the best.This series of cured samples exhibited excellent thermal mechanical properties and thermal stability.
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