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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
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....
References
French books
Regulations
The regulations below mainly concern resins. Please consult the manufacturer's safety data sheets for applicable regulations.
Occupational health and safety
Fiche toxicologique FT 7 Formol. Institut National de Recherche et de Sécurité (INRS).
Directive N° 89/391/CE
French law 91-1414...
Manufacturers. Suppliers
There are some 75 aminoplast suppliers in Europe, including around ten in France.
Borden Chimie SA (Deville-lès-Rouen) http://www.hexionchem.com
CECA SA (Courbevoie) http://www.ceca.fr
CMM SA (Paris)...
Standards
The 1999 ASTM D705 standard can still be used.
For applications as adhesives for the wood industry, please refer to standards NF EN 132 (March 1999) on vocabulary and NF T 76-011 on classification of the main adhesives.
French organizations
Plastics Federation http://www.proplast.org
Plastics Europe France (Syndicat des Producteurs de Matières Plastiques) http://www.spmp.sgbd.com
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