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首页> 外文期刊>RSC Advances >Synthesis and characterization of solvent-free waterborne polyurethane dispersion with both sulfonic and carboxylic hydrophilic chain-extending agents for matt coating applications
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Synthesis and characterization of solvent-free waterborne polyurethane dispersion with both sulfonic and carboxylic hydrophilic chain-extending agents for matt coating applications

机译：含哑光涂料的含磺酸和羧基亲水扩链剂的无溶剂水性聚氨酯分散体的合成和表征

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摘要

Simultaneously using sulfonic and carboxylic acid as hydrophilic chain-extending agents, a new type of solvent-free and chemical matt waterborne polyurethane resin was prepared and investigated. The chemical structure containing urethane and urea groups in this novel carboxylate/sulfonate type of waterborne polyurethane (CSWPU) resin was confirmed by FTIR, H-1 and C-13 NMR spectra. An obvious advantage for the environment is that, unlike the traditional synthetic method for waterborne polyurethane, the reactive system doesn't need any organic solvent to reduce the viscosity of the prepolymer in the process of prepolymerization. In addition, the gloss extinction was generated by the drying process of the resin itself, without the requirement of any matting agents. 3D-AFM images indicate that the surface of the matt CSWPU films was extremely rough and was comprised of many spherical particles with diameters in the range of 0.8-3.0 mu m arranged on the films' surface. The matt CSWPU resin tended to have a relatively higher molecular weight and lower swelling ratio. Moreover, an increase of sulfonic hydrophilic chain-extending agent content or the initial molecular weight of the soft segment facilitated the improvement of thermal stability.
机译：同时使用磺酸和羧酸作为亲水性扩链剂，制备并研究了一种新型的无溶剂化学哑光水性聚氨酯树脂。通过FTIR，H-1和C-13 NMR光谱证实了这种新型的羧酸盐/磺酸盐型水性聚氨酯（CSWPU）树脂中含有氨基甲酸酯基和脲基的化学结构。对环境的明显好处是，与传统的水性聚氨酯合成方法不同，反应体系不需要任何有机溶剂即可降低预聚合过程中预聚物的粘度。另外，消光是通过树脂本身的干燥过程而产生的，不需要任何消光剂。 3D-AFM图像表明无光泽的CSWPU膜的表面非常粗糙，并且由许多直径在0.8-3.0μm范围内的球形颗粒排列在膜表面上。哑光的CSWPU树脂倾向于具有相对较高的分子量和较低的溶胀率。此外，磺酸亲水性链增长剂含量或软链段的初始分子量的增加促进了热稳定性的提高。

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