Synthesis of urea-formaldehyde resin by melt condensation polymerization |
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| Authors: | Ya-qing Liu Yu Tian Gui-zhe Zhao You-yi Sun Fu-tian Zhu Yang Cao |
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| Affiliation: | (1) Research Center for Engineering Technology of Polymeric Composites of ShanxiProvince, North University of China, Taiyuan, 030051, China |
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| 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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| Keywords: | Melt condensation polymerization Urea-formaldehyde Paraformaldehyde uron ring |
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