Valorization of cashew nut shells as a binder for paint
Résumé
Actually, manufacturers are committed to developing bio-based products in order to replace fossil-based products with greater environmental impact. The International Associated Laboratory of the University of Antananarivo/University of Lyon1 is developing sustainable chemistry as one of its main research area. One of the examples in this field is the processing of cashew nut shell oil (CNSL) which is the main waste product of cashew nuts. The extraction of CNSL was realized using butyl acetate as a solvent. Binder synthesis was then carried out from this cashew nut shell liquid (CNSL) using potassium hydroxide and sodium chloroacetate in solution in order to obtain the oxyacetic derivative of CNSL. The latter was used as a binder in our paint and varnishes formulations. The material obtained as stable, free from any organic solvent (100% "water born") and didn’t require the use of drying agent or toxic additives. Weather resistance is estimated at over two years.
cashew nut shell oil, oxyacetic acid, bio-sourced, binder, paint
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