Lignin is often regarded as a waste product of pulping and biorefinery processes. Each year, about 60-120 million tonnes of lignin is isolated worldwide, of which 98 percent is incinerated for energy recovery. Lignin has several beneficial properties; however, the poor solubility of most lignin types and the mediocre performance of lignin-based products have so far limited its commercial applications.
'Lignin as a coating material is actually very promising with its many benefits compared to the synthetic and bio-based coatings currently used. It has excellent anti-corrosion, anti-bacterial, anti-icing, and UV-shielding properties. Our future research will concentrate on developing characteristics like elasticity of the coating', says Monika Österberg, Head of the Department of Bioproducts and Biosystems at Aalto University.
Currently, widely used mechanically protective coatings for materials such as wood, concrete, metals, and composites are petroleum-based, which include substances that are harmful for the environment. Vegetable-oil coatings – like those made from tall, linseed, coconut, soybean, and castor – can be more sustainable alternatives but they often lack durability. As a result, these oils are often combined with synthetic materials to improve their performance.
More sustainable and non-toxic alternatives can help the coating industry meet new safety regulations. For example, the amount of volatile organic compounds (VOCs) has been regulated not only due to their impact on health but also on the ozone layer. Similarly, the European Union (EU) has placed restrictions on some chemicals used by the coating industry, such as bisphenol A and formaldehyde (used in epoxy and polyurethane coatings), and recently classified titanium dioxide – one of the most widely used pigments in paints – as a class II carcinogen.