Preparation and surface sizing application of fluorine modified cationic polyurethane hybrid emulsion

The perfluorinated acrylate modified cationic polyurethane(FAPU) hybrid emulsion was prepared and characterized by IR and F19 NMR.The FAPU hybrid emulsion was used for paper surface sizing.The emphasis was put on the influence of the content of MDEA as cationic extender and the content of FA as functional monomer on the paper properties.The contact angles result shows that the water and oil-repellency property of the papers treated with FAPU increased and then decreased with the MDEA content increase,while the water and oil-repellency property both increased with the increase of FA content.The initial contact angles of water and liquid paraffin on the paper treated with FAPU of 30% content FA were 132 and 114°,respectively.In addition,the contact angles changed little within 300s which indicated that the paper treated with FAPU possessed good water and oil-repellency ability.The mechanical property test results show the paper tensile strength increased with the increase of the MDEA and FA contents.At last,the surface and crosssection of the paper untreated and treated with FAPU were observed by SEM,respectively.The result shows that the fibers of the treated paper more closely combined.