Urea-formaldehyde resin modified with melamine is a common method adopted widely in the industry. Melamine can effectively modify the water resistance and weather durability of urea-formaldehyde resin, and reduce the content of free formaldehyde. However, during the resin application, it is very important for melamine to take part in urea-formaldehyde resin reaction and form effective co-condensation composition or not. Based on above, a series of MUF resins are synthesized with different melamine and urea mass ratio under the same final F ∶( M+U) and the first stage F ∶( M1+U1 ) molar ratio condition. And the molecular distribution of different resins are represented by using electrospray ionization mass spectrometry ( ESI-MS) . By comparing figures of different samples, the results showed that different reaction material content has a great influence on the composition, molecular distribution and co-condensation content of co-condensation resin. And when the mass amount of melamine added to 40%, the molecular distribution of MUF resin changed qualitatively and co-condensation composition content also had significant increase. Therefore, under this experiment conditions, adding melamine content can effectively promote the co-condensation reaction, meanwhile, the formation of co-condensation resin requires melamine content at least about 40%.
electrospray ionization mass spectrometry( ESI-MS)MUF co-codensation resinmolecular distribution
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