Overview
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Claude DUVAL : Honorary Senior Lecturer
INTRODUCTION
Aminoplasts are thermosetting materials obtained by polycondensation with elimination of water of molecules containing several –NH 2 functions, generally urea or melamine, with formaldehyde and leading to a three-dimensional network.
Aminoplasts (mainly urea-formaldehyde: UF and melamine-formaldehyde: MF) are used by a wide range of industries, either as polycondensates (often in solution in water), or as molding compounds. Their consumption represents almost 60% of that of thermosets, but only 5% of that of all plastics. Molding applications have declined significantly in Europe and North America, and are now concentrated mainly in the Far East.
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Aminoplasts
Preparation
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"Plastics and composites"
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Economic aspects
1 Presentation and business forms
1.1 Resins
Urea-based resins generally take the form of a syrup (aqueous solution) containing 50-65% solids. Some wood glues come in UF powder form, sometimes containing a hardener. Liquid glues may contain a filler (e.g. wood flour).
Melamine- or melamine/phenol-based resins are marketed in syrup or powder form....
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