Abstract
Traditional method of synthesizing urea-formaldehyde (UF) resins is condensation polymerization with formaldehyde and urea in aqueous solution, which leads to the low resistance of UF resins against the influence of water and moisture and results in the high formaldehyde emission. A new method of melt condensation polymerization was used to synthesis UF resin by paraformaldehyde with urea. Fourier-transform infrared spectroscope and Carbon-13 nuclear magnetic resonance were performed to elucidate the uron rings structural characteristics of UF resin by the synthetic route. The stability during storage and application were characterized by measuring concentration of methanol and free formaldehyde, and DSC and TG analysis, respectively. The results show that UF resin synthesized by melt condensation polymerization has lower content of free formaldehyde, high thermal stability and better stability during storage.
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