The demand for waterborne polyurethane coatings is surging day by day with large number of users using it for the trade coating of wood and parquet floors. Their quality of producing very small amount of volatile organic compounds (VOC) makes them every useful. They are almost odorless and are almost nil polyurethane dispersion available that do not contain N-methyl pyrrolidione (NMP).
It is obvious that new waterborne polyurethane prepolymers require less co-solvent to produce good coatings than the products containing NMP. The waterborne polyurethane coatings are in huge demand due to their unmatched resistance to abrasion and high mechanical resistance properties.
Nowadays, the manufacturers have developed the new polyurethane dispersions by replacing the old polymer mixing process which includes NMP as a solvent with the acetone process. The acetone process requires adjusting the recipes for the dispersions to be responsible for the lower solvent power of the acetone, which is distilled off following the creation of the prepolymer to get a solvent-free product.
