Using Isoconversional Kinetic Analysis of LiquidMelamine-Formaldehyde Resin Curing to PredictLaminate Surface Properties

摘要

The curing kinetics of a liquid melamine–formaldehyde impregnation resin were analyzed with dif-ferential scanning calorimetry, and the conversion-depend-ent activation energy for melamine–formaldehyde curingwas estimated with the isoconversional model-free kineticapproach developed by Vyazovkin. The conversion-de-pendent activation energy was used to extend the predic-tive power of a response surface model describing theinfluence of some processing factors (press time and resincomposition) in the manufacturing of particleboardscoated with melamine–formaldehyde-impregnated papers.By substituting the factor "press time" in an RSM estab-lished for a press temperature of 170 °C by the factor"conversion" which is accessible from thermo-chemicalanalysis, additional information on temperature was incor-porated into the model. Model applicability for additionaltemperatures was evaluated with 12 validation experi- ments. Although chemical resistance was difficult tomodel, cleanability was sufficiently well described by onlyone factor (conversion). Surface gloss depended on boththe conversion and catalyst amount and was predicted bya two-factor interaction model (R~2=0.95). This studydemonstrates that parameters derived from the isoconver-sional kinetic analysis of liquid resins not only are theoret-ical descriptors but also have direct practical relevance inthe modeling of product properties derived from these liq-uid resins when used to supplement technological data-bases.