氟改性双组分水性丙烯酸聚氨酯涂料性能研究

以甲基丙烯酸十二氟庚酯（DFMA）、丙烯酸（AA）、甲基丙烯酸羟乙酯（HEMA）、甲基丙烯酸甲酯（MMA）和丙烯酸丁酯（BA）为原料，采用溶液聚合法合成了一系列氟含量不同的水性羟基丙烯酸树脂。将含氟水性羟基丙烯酸树脂、亲水性异氰酸酯固化剂和助剂混合制备氟改性双组分水性丙烯酸聚氨酯（2K—WPU）涂料。利用傅里叶变换红外光谱（FT-IR）对其结构进行了表征，并对涂料的接触角、吸水率和清漆性能分别进行了测试。结果表明，该水性树脂粒径在28．2～68．1nm之间，粒径分布均匀。当水性羟基丙烯酸树脂组成中DFMA质量分数从0增加至20％时，所制备氟改性2K-WPu涂料的水接触角从70．3。增大到97．6。，吸水率从11．4％降低至6．31％，涂膜的耐水性显著提高。清漆性能测试表明，所制氟改性2K．WPu的各项性能优异。

Research of Fluorine-Modified Two Component Waterborne Acrylic Polyurethane Coating Performance

A series of waterborne hydroxyl polyacrylate resin with different fluorine content were successfully prepared by solution polymerization, using dodecafluoroheptyl methacrylate （DFMA）, acrylate acid （AA）, hydroxyethyl methacrylate （HEMA）, methyl methacrylate （MMA） and butyl acrylate （BA） as monomers. Fur- thermore, the hydroxyl acrylic resins were cured with hydrophilically modified polyisocyanate curing agent （Bay- hydur XP 2655 ） to obtain two-component waterborne acrylic polyurethane （2K-WPU） coatings. FT-IR was employed to investigate the structure of the resin and cured films. The contact angle, water swelling ratio and varnish properties of the cured films were tested, respectively. The test result showed that the resins had an average particle size ranging from 28.2 nm to 68.1 nm and exhibited unimodal size distributions. The experiment revealed that the contact angle of 2K-WPU films increased from 70.3° to 97.6° and the water swelling ratio decreased from 11.4% to 6.31% with the DFMA content in hydroxyl polyacrylate resin increasing from 0 to 20%, indicating that the water resistance of 2K-WPU was greatly improved by the incorporation of fluorine-containing component. In addition, varnish test showed that the fluorine-modified 2K-WPU exhibited excellent properties.