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.
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