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The possibility of storage of melamine formaldehyde (MF) resin solutions at elevated temperatures is examined. A series of MF resin solutions with various formulations were synthesised and storage stability was studied at room temperature and 50°C. In general, the stability at 50°C was higher over a much broader range of reaction times when compared with storage stability at room temperature. The storage of MF resin solutions at elevated temperatures offers many advantages like the ease of resin production on large scale and high reproducibility of storage stability. Further, it is shown, by means of 13 C-NMR and light scattering analysis, that the chemical structure and molecular weight are identical at the point of instability at 50°C irrespective of the initial degree of condensation i.e. reaction time. |
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