Study of polyurethane surface coatings based on (rosinified phenolic resincastor oil) blends with diisocyanates

摘要

Surface coating formulations were prepared by blending of rosinified phenolic resin with castor oil of different % weight ratio was carried out. Such obtained polyols were treated stoichiometrically hexamethylene diisocyanate (HMDI) and diphenylmethane diisocyanate (MDI) to afford polyurethane syrups. FT-IR analyses were monitoring for these polyurethane. These produce polyurethane syrups (i.e. resins) resins were casted into film. The result of polyurethane film were characterized for surface drying time, tack-free time,mechanical properties like scratch, impact, pencil hardness, adhesion and flexibility. The chemical properties like acid, alkalies and solvent resistance of these coats have also been checked.