| Résumé : |
The utilization of renewable resources in the development of eco-friendly paints and coatings is of increasing interest in the chemical industry now due to their universal availability, inherent biodegradability, low price and low toxicity. Particularly, current research and development work on the application of vegetable ails and plant proteins in coating systems is addressed. Vegetable ails (VO) constitute the largest biodegradable family yielding materials that are capable of competing with petroleum based products. They have unique chemical structure with unsaturation sites, epoxies, hydroxyls, esters and other functional groups along with inherent fluidity characteristics. These enable them to undergo various chemical transformations producing low molecular weight polymeric materials with versatile applications, particularly in paints and coatings. Furthermore, the plant protein like wheat gluten was modified chemically to obtain aqueous protein dispersions that have excellent film-forming characteristics and strong adhesion to various surfaces. Wheat gluten films have very interesting mechanical properties such as extensibility and moisture permeability. Durability and water resistance of the coatings can be tailored by varying the degree of cross-linking of the protein binder. Based on the observed characteristics of the modified protein binders, the development of novel, organic solvent-free paints and coatings appears to be possible. This review paper presents an overview of the recent developments and perspectives on the application of renewable resources in coatings technology. We have briefly described VO derived materials such as alkyds, polyesteramides, polyetheramides, polyurethanes, epoxies, polyols along with their preparation and applications in Paints and coatings. The use of proteins as biopolymer binders in coatings formulations is also well described in this paper. |
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Eco-friendly coating materials based on renewable resources in PAINTINDIA, Vol. LXV, N° 7 (07/2015)
