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Thursday, 19 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Chemically modified cellulose nanofibril as additive for polyurethane coatings

Monday, 30 January 2017

In a study by Finnish researchers, the potential of silyl functionalised cellulose nanofibrils (CNF) as reinforcing additive for water- and solvent-based two-component polyurethane (PU) coatings was evaluated.

Chemically modified cellulose nanofibril as additive for polyurethane coatings. Source: pixabay.com/CCO

Chemically modified cellulose nanofibril as additive for polyurethane coatings. Source: pixabay.com/CCO

The increasing demand for the use of sustainable materials in industrial applications has created an urge to develop technologies that enable the use of biopolymers such as cellulose for the improvement of properties of commercial products.

Potential even at low loadings

The addition of silylated CNF improved the abrasion resistance, strength, and elasticity of PU coatings. When using silylated CNF as additive, the adhesion of the PU coatings was retained. The oxygen permeation rate of silylated CNF films was strongly influenced by the nature of the solvent. The silylated CNF showed potential as a reinforcing additive even at low loadings in two-component PU lacquers.

The study is published in: Applied Polymer Science.

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