Synthesis and Characterization of Melamine-Formaldehyde Resin for Foaming Use
The effects of mole ratio of formaldehyde and melamine (F/M), solution pH, reaction temperature and time on the foaming melamine-formaldehyde resin (MF resin) with caprolactam as modifier were investigated by orthogonal experiment design where the solid content and the viscosity of the resin, the density and the size uniformity of the foam resin were used as performance evaluation parameters. The results had shown that the optimal conditions for preparing the foaming MF resin were F/M= 3.25, pH=8.0, T=90°C, t=45min. The MF resin prepared under the optimal conditions could be foamed well and its storage time was prolonged to 16 days. The structure and thermal properties of MF resin under the optimal conditions were investigated.
J. X. Liu et al., "Synthesis and Characterization of Melamine-Formaldehyde Resin for Foaming Use", Applied Mechanics and Materials, Vol. 628, pp. 24-27, 2014