CNSL oxyacetic derivatives, new bio-based binder for paint preparation

Abstract

The global coatings industry produces tens of millions of metric tons of paints each year and this quantity continues to grow. Most of them are obtained totally or partially from fossil resources and many of them still use VOCs (Volatile Organic Compounds) and/or other harmful chemicals. We describe in this article, the cashew nut shell liquid as a raw material for paint binder synthesis (sustainable materials). These binders are obtained in a single chemical step without tedious separation. This new bio-based material (renewable resources) formed stable films (green coatings) in a short drying time. Paints formulated are 100% aqueous have low toxicity and ecotoxicity and require no additional drying agents or VOCs. Oxidative coupling of the alkylidene chain and the addition of carboxylic acid to the carbon-carbon double bonds are implemented. The products obtained could be applied on different kind of surfaces such as glass slide, metal, wood or concrete and exhibit good stability against various solvents and tropical conditions.