Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings

IF 2.3 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2024-02-28 DOI:10.1007/s11998-023-00893-1

Aohuan Guo, Jianben Xu, Caili Yu, Faai Zhang

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Abstract

Traditional two-component waterborne polyurethane (2K WPU) has low water resistance, which limits its application in the wide field. In this work, fluorine-modified 2K WPU films (2K-WFPUs) were successfully prepared using a fluorine-modified acrylate emulsion as hydroxyl component and a hydrophilically modified polyisocyanate as curing agent. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy analysis indicate that hexafluorobutyl acrylate (HFBA) was successfully introduced into the 2K-WFPUs. The effects of HFBA content on the surface, thermal stability, water resistance, mechanical, and application properties of 2K-WFPUs were investigated. Compared with the unmodified film, with the increase in HFBA level from 0 to 8%, the static water contact angle of 2K-WFPUs increased from 66° to 92°, the surface-free energy decreased from 42.7 to 28.4 mJ m⁻², the water absorption reduced from 15.9 to 9.9%. Thermogravimetric analysis shows that the thermal stabilities of 2K-WFPUs were improved remarkably. Meanwhile, adding HFBA did not weaken the impact resistance, flexibility, and adhesion of 2K-WFPUs and maintained the highest level. The fluorine-modified 2K WPU coatings have potential application in wood furniture and automotive finishing.

Graphical abstract

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双组分水性聚氨酯涂料中含氟丙烯酸酯乳液的制备和应用

传统的双组分水性聚氨酯（2K WPU）耐水性较低，限制了其在广泛领域的应用。本研究以氟改性丙烯酸酯乳液为羟基组分，亲水改性多异氰酸酯为固化剂，成功制备了氟改性 2K 水性聚氨酯薄膜（2K-WFPUs）。傅立叶变换红外光谱、扫描电子显微镜和 X 射线光电子能谱分析表明，六氟丁基丙烯酸酯（HFBA）被成功引入到 2K-WFPU 中。研究了 HFBA 含量对 2K-WFPU 表面、热稳定性、耐水性、机械和应用性能的影响。与未改性薄膜相比，随着 HFBA 含量从 0% 增加到 8%，2K-WFPU 的静态水接触角从 66°增加到 92°，表面自由能从 42.7 mJ m-2 降低到 28.4 mJ m-2，吸水率从 15.9% 降低到 9.9%。热重分析表明，2K-WFPU 的热稳定性显著提高。同时，添加 HFBA 不会削弱 2K-WFPU 的抗冲击性、柔韧性和粘附性，并保持了最高水平。氟改性 2K WPU 涂料有望应用于木制家具和汽车涂装。

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.