改性纳米二氧化硅含氟水性聚氨酯聚丙烯酸酯分散液的制备及成膜性能研究高分子化学与物理专业论文.docxVIP

明：控制纳米二氧化硅加入量在0％．5％，随着改性纳米二氧化硅含量的上 明：控制纳米二氧化硅加入量在0％．5％，随着改性纳米二氧化硅含量的上 升，乳液粒径增大，机械稳定性逐渐降低，乳液外观从微蓝半透变为乳白色 不透明。WSFPUA复合乳胶膜的拉伸强度增长到43．08 MPa，接触角也上升 至122．5。，吸水率下降至8．5％。同时，乳胶膜得到的表面光滑度以及耐热 性都随纳米二氧化硅含量的增加而出现显著增强。 (4)研究了不同丙烯酸羟乙酯(}玎巳A)含量下的WSFPUA复合乳液 及乳胶膜的性能。分别讨论了其对乳胶膜表面形貌，热稳定性、耐水性、拉 伸性能、透射电镜以及涂层性能的影响。随着HEA含量的增加，乳胶膜变 得越来越平整，而且WSFPUA热稳定性、耐水性以及拉伸性能得到明显提 高。 关键词：聚氨酯．聚丙烯酸酯，纳米二氧化硅，复合乳液，乳胶膜，疏水 万方数据 STUDY STUDY oN PREPARATIoN AND PERFoRM巳州CE oF NANo SILICA AND FLUORoCARBON ANIoNIC WATERBoRNE PoLYURETIL蝌E／ACRYLATE DISPERSIoN ABSTRACT With the development of environmental protection and safety,the performance demand of coating and paint products was becoming higher and higher．As the development of waterborne polyurethane(PU)industry,The scientists are focus on solving the disadvantages of PU hydrophobic enough， poor flexibility and insufficient tensile strength． In this paper,silane coupling agent(KH570)produced silicon alcohols by hydrolysising in acidic conditions and hydroxyl on the surface of nano-silica occurredpolymerization to realize the modification of nano silicon dioxide，then taking vinyl monomers place organic solvent by situ emulsion polymerization， the isophorone isocyanate(IPDI)，poly(caprolactone)diol(PCL 1 000)and hydroxyl ethyl acrylate(HEA)Was added to the system，forming the double bond-end PU pre polymer；Fluorine alcohol(FA)monomer containing carbon．carbon double bond and nano．silica Was innovative introduced in polyurethane preformed stage．The initiator KPS initiated vinyl monomer occurred free radical polymerization． Finally,the modified nano silica／fluorinated waterborne polyurethane polyacrylate(WSFPUA)composite emulsion Was synthesized．The effects of reaction conditions and the properties of KH-5 70 modified nano silica Was studied in this paper,then the impact on the content of fluorine ester and nano-silica of WSFPUA composite emulsion and latex film morphology properties Was studied．This paper main content is as follows： (1)In the experiment of modifi