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KH550改性水性光固化聚氨酯乳液的制备及性能

发表时间:2012-04-15  浏览量:1263  下载量:611
全部作者: 罗家和,郭金山
作者单位: 兰州大学化学化工学院高分子科学与工程研究所
摘 要: 为适应水性光固化体系的快速发展,通过引进季戊四醇三丙烯酸酯和γ-氨丙基三乙氧基硅烷(KH550)进入聚氨酯链的末端,合成了一系列KH550改性水性光固化聚氨酯乳液(Si-PUs)。用傅里叶红外(Fourier transform infrared spectroscopy, FT-IR)对Si-PUs乳液进行结构表征,表明KH550已被引入到聚氨酯骨架中,用扫描电子显微镜(scanning electron microscopy, SEM)、热重分析仪(thermogravimetric analysis, TGA)对聚合物膜做了表面形态分析和热分析,并考察了KH550用量对涂膜耐水性能,机械性能的影响。研究表明:KH550的引入延缓了固化涂膜的热分解温度,高温稳定性较好;固化涂膜的耐水性因为引入Si—O—Si而得到明显提高,随着KH550用量的增加涂膜的硬度、光泽、附着力和柔韧性等均得到提高,但降低了涂膜的耐冲击性。
关 键 词: 高分子化学;光固化;水性;聚氨酯;KH550
Title: Synthesis and characterization of 3-aminopropyltriethoxysilane modified uv-curable waterborne polyurethane emulsions
Author: LUO Jiahe, GUO Jinshan
Organization: Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University
Abstract: In this work, a series of 3-aminopropyltriethoxysilane (APTES, KH550) modified UV-curable waterborne polyurethane emulsions (Si-PUs) were synthesized by incorporating the pentatry thritol triacrylate (PETA) and the APTES into the end of the polyurethane chains. Structural and morphological features of coatings were assessed using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Results showed that the coating is uniform and homogeneous. Thermal property of the coatings was also examined by thermogravimetric analysis (TGA). It was found that grater thermal property was obtained with incorporation of APTES. In addition, study on effect of water resistance of Si-PUs films showed that improving water resistance with hydrophobicity of Si—O—Si linkage. Results from the mechanical measurements showed that the APTES improved various mechanical properties such as pencil hardness, gloss, adhesion and flexibility but decreased the impact resistance of the films.
Key words: polymer chemistry; UV-curable; waterborne; polyurethane; KH550
发表期数: 2012年4月第7期
引用格式: 罗家和,郭金山. KH550改性水性光固化聚氨酯乳液的制备及性能[J]. 中国科技论文在线精品论文,2012,5(7):642-649.
 
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