H2O2 CATALYTIC CURE OF UREA-FORMALDEHYDE RESINS WITH DIFFERENT STRUCTURES

The H2O2 catalytic cure of urea formaldehyde (UF) resins with differen t structures was investigated by Fourier transform infrared spectrosco py, carbon-13 nuclear magnetic resonance and thermal analysis. The res ults show that H2O2 can be used as an effective curing agent of UF res ins. Compared with the traditional curing agent NH4Cl, with H2O2 the c uring reaction of the resins takes place at higher temperatures and th e exothermal enthalpy is larger; moreover, the pot life of the adhesiv e systems increases significantly. Scission of the triazinone and uron rings containing -NH- groups appears to some extent during curing.