Coating systems based on functionalized polysaccharides

The aim of this project is the development of bio-based coating systems based on modified polysaccharides for indoor use. The main field of application is solid wood and wood-based materials. Currently, the film formers used in conventional coating systems are mainly produced synthetically from petroleum-based raw materials. The natural polymer raw materials, such as, cellulose, starch, and hemicelluloses are widely available and represent the most important renewable raw materials world-wide.

The project is based on the oxidation of polysaccharides that leads to the formation of dialdehyde polysaccharides, such as, 2,3-dialdehyde cellulose (DAC), starch, glucomanans, and/or xylans. In the next steps, the dialdehyde polysaccharides are modified to other compounds which can show a wide variety of properties in terms of dispersibility in water, polarity, elasticity, and compatibility of the individual coating components as well as the pore size in the dispersion. Another aim of the project is the development of flame retardants by phosphorylation of polysaccharides (cellulose, starch). The formulations produced in this research project are tailored to the area of application by adding further additives. Use of pigments or dyes for a coloured coating and adding light protection agents such as UV absorbers and radical scavengers (HALS - "Hindered Amine Light Stabilizers") are conceivable.