Application of Polyurethane/Polyvinylamine Composite Colloid in Cellulose Fiber Materials
Polyurethane/polyvinylamine(PU/PVAm)composite colloids were prepared by physically blending synthesized waterborne polyurethane with polyvinylamine.The aim of this research was to investigate the effects of colloid preparation conditions on film-forming properties and their potential applications in cellulose fiber materials.The results reveal that when the mass fraction of polyvinylamine is 60%,the resulting colloidal composite film exhibits an elongation at break of 1112.5%,a tensile breaking strength of 7.39 MPa,and a toughness of 52.7 MJ/m3.Furthermore,the composite colloid was employed as surface sizing agent for paper preparation.It is observed that the handsheets with a sizing amount of 6%show a significant improvement in the tensile index and tear index,with increases of 204%and 131%,respectively,compared to the original paper.This research holds significance for the preparation and application of polyurethane-based composite colloids.