| Résumé : |
Environmental legislation continues to be a major force for change within the surface coatings industry. This is motivated, both by concern for human health ( classifiction / labelling, occupational exposure limits, notifiation / testing and market restrictions / bans ), as well as the environment ( reduced emissions, VOC controls, waste minimisation ). There is, therefore, a move towards cleaner technologies which take a holistic view of the whole coatings process. Products are becoming ever more complex in order to provide comparable, or superior, in-use performance, coupled with enhanced environmental characteristics.
It is possible to identify aspects at all points in the coating life-cycle from raw materials suply, manufacture, use and disposal. This paper discusses some of these newer possibilities in terms of emerging polymerisation processes, and highlights possibilities for the design of environmentally-compliant coatings especially in the move to lower VOC content materials. In solvent-borne technology there is a move, both to higher solids, as well as towards the use of more benign solvents. In water-borne coatings we can see the need for greater control of macroscopic structure ( core-shell ) for improved film formation and balance of properties, as well as the trend towards co-solvent removal. In solvent-free materials ( ie thermoset powder ) there is the move to lower temperature stoving coupled with a desire to exploit further acrylic technology. |
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Recent developments in polymer design in SURFACE COATINGS INTERNATIONAL, Vol. 79, N° 10 (10/1996)
