TAGS: Sustainability / Natural Coatings Wood Coatings Smart Coatings
Researchers at Aalto University have used lignin, a natural polymer abundant in wood and other plant sources, to create a safe, low-cost and high-performing coating for use in construction.
Retaining Wood’s Breathability
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Our new coating has great potential to protect wood. It's more water repellent than a lot of commercial coatings because it retains the natural structure of wood and its micro-scaled roughness. Since it's hydrophobic, the coating is also quite resistant to abrasion and stains, while lignin’s inherent structure resists colour changes from sunlight. It also does an excellent job of retaining wood’s breathability,’ explains Alexander Henn, doctoral candidate at Aalto University, The School of Chemical Engineering.
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.
Related read: 5 Trends Changing the Way Wood Coatings are Formulated
Source: Aalto University