Catalysed NIPU coatings from bio-based poly(cyclic carbonates)
Concerns on the use of isocyanates as starting materials for polyurethanes (PUs) have risen due to their effects on human health after exposure and also because their synthesis involves the use of phosgene. Polyurethanes are highly versatile materials used in widespread industries such as automotive, building, construction, and packaging. They have also been used as flexible and rigid foams, adhesives, coatings, thermoplastic, or thermoset materials. Traditionally, PUs are synthesised from polyols and polyisocyanates. In order to circumvent the concerns, much research has been devoted to exploring alternative approaches to the synthesis of PUs.
Development of bio-based non-isocyanate polyurethane coatings
NIPU synthesis using cyclic carbonates and amines has gained popularity as one of the new approaches. In a recently published study, novel bio-based resins were synthesised by converting epoxidised sucrose soyate into carbonated sucrose soyate (CSS) under supercritical conditions. Initial studies have shown promise in systems where CSS is crosslinked with multifunctional amines generating coatings with good solvent resistance. The current work focused on studying the effect of catalysts and developing formulations of bio-based non-isocyanate polyurethane coatings.
The study is published in: Journal of Coatings Technology and Research January 2019, Volume 16, Issue 1, pp 41–57.
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