氟改性和硅改性丙烯酸聚氨酯涂层的制备及环境行为

目的研究氟改性和硅改性丙烯酸聚氨酯涂层在不同环境中的失效行为。方法通过溶液聚合法制备具有一定羟基含量的丙烯酸酯树脂,再将丙烯酸树脂与多异腈酸酯固化剂配合,获得丙烯酸聚氨酯涂层。通过在丙烯酸酯合成中引入含氟丙烯酸酯单体,制得氟改性丙烯酸聚氨酯涂层;通过在固化过程中引入氨基硅油,制得硅改性丙烯酸聚氨酯涂层。利用傅里叶变换红外光谱(FT-IR)分析涂层的化学组成。对涂层试样进行温度环境实验(室温和100,150℃)、湿热环境实验和氙灯老化实验,分析涂层疏水性、光泽度等表面特性的变化。结果氟、硅改性有效提高了涂层的疏水性。未改性、氟改性和硅改性三种涂层在100℃以下的环境中服役时,疏水性和光泽度比较稳定。硅改性涂层在150℃的高温环境中较未改性和氟改性涂层失效慢。湿热环境对三种涂层的接触角和光泽度等性能影响不大。氟改性涂层在氙灯老化环境中的失效程度较另外两种涂层轻。结论氟改性涂层耐光老化性能较好,硅改性涂层耐温性较好。

Preparation of Fluorinated and Silicone Acrylic Polyurethane Coatings and Their Environmental Behaviors

ABSTRACT:Objective To investigate the failure behaviors of different coatings in different environments. Methods Acrylic res-ins with certain amount of hydroxyl were prepared via a solution polymerization route. Acrylic polyurethane coating was obtained by mixing the acrylic resins with polyisocyanate. Fluorinated acrylic polyurethane coating was prepared by introducing fluorinated acry-late into the synthesis of the acrylic resins, while silicone acrylic polyurethane coating was synthesized by introducing amino silicone oil into the curing process of the coatings. The chemical structure of the coatings was confirmed by FT-IR. Failure behaviors of the coatings in different temperature environments ( room temperature, 100 ℃, 150 ℃) , hydrothermal environment and xenon arc lamp artificial aging experiment were monitored by characterizing the contact angle and glossiness of the coatings. Results The hy-drophobicity of the coatings was effectively improved by the incorporation of the fluorine and silicon components. The normal, fluor-inated and silicone acrylic polyurethane coatings had stable hydrophobicity and glossiness in environments with a temperature below 100 ℃. Among the three coatings, the fluorinated coating failed most slowly in the xenon lamp aging test, and the silicone coating failed most slowly in the high-temperature environment ( 150 ℃) . Hydrothermal environment had no significant influence on the contact angle and glossiness of all the three coatings. Conclusion Fluorinated coating showed better resistance to photo-aging, while silicone coating had better resistance to the high-temperature environment.