氟改性阳离子聚氨酯复合乳液制备及其表面施胶应用

制备稳定的全氟烷基丙烯酸酯改性阳离子聚氨酯复合乳液,并通过红外和核磁共振氟谱对其结构进行表征。将其应用在纸张表面处理上,重点研究阳离子扩链剂N-甲基二乙醇胺(MDEA)用量及功能性单体全氟烷基丙烯酸酯(FA)用量对纸张表面防水防油性能和力学性能的影响。接触角分析表明随MDEA用量增大,纸张防水性和防油性先增大后减小;随FA用量增大,防水性和防油性均增大。经m(FA)=30%的FAPU复合乳液处理过的纸张,水和油在其上所成初始接触角分别可达132和114°,并且在300s测试时间内,其随时间变化很小。力学性能测定表明MDEA和FA用量增大,纸张抗张强度增大。纸张表面和断面扫描电镜观察表明,经FAPU处理过的纸样其纤维结合更加紧密。

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.