在水性聚氨酯中原位引入二氨基硅烷提高涂层表面疏水性。
In Situ Incorporation of Diamino Silane Group into Waterborne Polyurethane for Enhancing Surface Hydrophobicity of Coating.
机构信息
State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
出版信息
Molecules. 2019 Apr 28;24(9):1667. doi: 10.3390/molecules24091667.
A series of waterborne polyurethanes (WPU) with crosslinked siloxane were obtained through introducing 3-(2-aminoethylamino)propyldimethoxymethylsilane (APTS) into WPU by in situ polymerization. The properties of WPU modified by APTS were studied through a variety of experimental methods. The water contact angle of the WPU coating surface increased from 64° to 86°, and the water resistance reduced to 3.90% when 3 wt% APTS was added, which improved the coating surface hydrophobicity. Firstly, Fourier transform infrared (FT-IR) and H-NMR spectra demonstrated the successful incorporation of APTS to polyurethanes and completed the hydrolytic condensation reaction-generated Si-O-Si crosslinking structure. Furthermore, the surface energy of the membrane was reduced when the crosslinking structure migrated and enriched on the surface of film. Besides, the crosslinking structure was abundant, and the distribution of siloxane in WPU was more uniform.
通过原位聚合，将 3-(2-氨乙基氨基)丙基二甲氧基甲基硅烷 (APTS) 引入到水性聚氨酯 (WPU) 中，得到一系列交联硅氧烷水性聚氨酯。通过多种实验方法研究了 APTS 改性 WPU 的性能。当添加 3wt%的 APTS 时，WPU 涂层表面的水接触角从 64°增加到 86°，水阻降低至 3.90%，提高了涂层表面的疏水性。首先，傅里叶变换红外 (FT-IR) 和 H-NMR 谱图表明 APTS 成功地掺入到聚氨酯中，并完成了水解缩合反应生成的 Si-O-Si 交联结构。此外，当交联结构迁移并在膜表面富集时，膜的表面能降低。此外，交联结构丰富，硅氧烷在 WPU 中的分布更加均匀。
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