Producing polyurethane free of polyoils and isocyanates
Problem: Currently polyurethanes are commonly polymerized in organic solvent (DMF) with isocyanates. This system involves a significant environmental and health problem for workers, since the isocyanates are toxic and therefore it is important to reduce the exposure of operators and users of the final product.
State of the Art: The term polyurethane indicates a large family of polymersin which the polymeric chain consists of urethane bonds -NH-(CO)-O-. Polyurethanes are widely used for the production of a large variety of materials such as panels, building materials, clothing, cars interiors, furniture, etc.
Polyurethane contains polyols and isocyanates in its structure that are potentially carcinogenic, which is the reason why polyurethane production is reported by the American Environmental Protection Agency as dangerous for workers. There is another question about what are the effects on consumers. Crossing’s ACLs allows the production of polyurethane free of polyols and isocyanates.
Solution: Crossing’s studies on real manufacturing processes have shown that ACLs can be used as a substitute for traditional isocyanate systems for crosslinking polyurethanes.
From the tests it was possible to highlight that:
– mixtures with a low content of ACLs maintain a colourless appearance over time (up to two months) and can still be coated;
– clear films are obtained at 140 °C which resist solvent extractions;
– good adhesion values are granted.