GMA对水性聚氨酯/聚丙烯酸酯清漆性能的影响

Effects of GMA on the properties of waterborne polyurethane/polyacrylate varnish materials

摘要:

以聚己内酯二元醇（PCL），异佛尔酮二异氰酸酯（IPDI），2,2-二羟甲基丁酸（DMBA），甲基丙烯酸甲酯（MMA）和丙烯酸丁酯（BA）为原料合成水性聚氨酯/聚丙烯酸酯乳液（WPUA），向WPUA中引入甲基丙烯酸缩水甘油酯（GMA）和烯丙氧基羟丙基磺酸钠（AHPS），制备了环氧改性水性聚氨酯/聚丙烯酸酯（EPUAS）复合乳液，采用傅里叶变换红外光谱（FTIR）、X射线衍射仪（XRD）和热重分析（TGA）等对改性前后EPUAS膜的结构和性能进行了表征，探讨w (GMA)对乳液及其涂膜性能的影响。结果表明，EPUAS乳液具有核-壳结构，随着w (GMA)由1 %提高到4 %，胶膜的热稳定性提高，拉伸强度从6.8逐渐增加到12.3 MPa，断裂伸长率由12.2 %减小到6.6 %，交联度由60.1 %增加到81.7 %、乳液的粒径从198 nm增大到273 nm；且在w (GMA)为4 %时，EPUAS胶膜的吸水率、吸溶剂率分别降到7.2 %、16.3 %，综合性能达到最佳。

Abstract:

Waterborne polyurethane/polyacrylate emulsion (WPUA) was synthesized with poly-caprolaclone glycol (PCL), isophorone diisocyanate (IPDI), 2,2-dimethylol butyric acid (DMBA), methyl methacrylate (MMA) and butyl acrylate (BA). Glycidyl methacrylate (GMA) and allyloxy hydroxyl propanesulfonic salt (AHPS) were introduced to the waterborne polyurethane/polyacrylate system and a stable epoxy-modified waterborne polyurethane/polyacrylate (EPUAS) composite emulsion had been obtained. The structure, morphology and properties of polyurethane/polyacrylate emulsion and films were characterized by fourier transform infrared spectroscopy (FTIR), transmission electron microscopic (TEM)，X-ray diffraction analysis (XRD) and thermogravimetric analysis (TGA). The amount of GMA on properties of the polyurethane/polyacrylate emulsion and films were discussed. The results showed that EPUAS emulsion shows a core - shell structure, with the increase of w (GMA) from 1 % to 4 %, the thermal stability of the film were improved, the tensile strength gradually increased from 6.8 to 12.3 MPa, elongation at break reduced from 12.2 % to 6.6 %, the degree of crosslinking increased from 60.1 % to 81.7 %, the particle size of the emulsion waw increased from 198 nm to 273 nm, and with the w (GMA) at 4 %, the water absorption, solvent absorption rate of EPUAS film each was fallen to 7.2 %, 16.3 % , whose overall performance achieved the best.