| 水性聚氨酯的交联改性及其性能 |
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| 引用本文： | 罗春晖,瞿金清,陈焕钦.水性聚氨酯的交联改性及其性能[J].高校化学工程学报,2009,23(4). |
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| 作者姓名： | 罗春晖 瞿金清 陈焕钦 |
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| 作者单位： | 华南理工大学,化学与化工学院,广东,广州,510640 |
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| 基金项目： | 粤港关键领域重点突破项目 |
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| 摘 要： | 阴离子水性聚氨酯(PU)含有羧基起内乳化剂作用稳定水性聚氨酯分散体(PUD),同时也使PU膜具有高的亲水性.为提高PUD涂膜性能,采用氮丙啶和聚碳化二亚胺对其进行交联改性.利用红外光谱和热重分析表征了PUD固化涂膜,结果表明:在室温下氮丙啶和聚碳化二亚胺可与PUD链上的羧基反应,PUD涂膜性能的提高取决于固化剂种类:如氮丙啶能显著改善涂膜耐水性、耐溶剂性及耐污染性,因其能提高涂膜的凝胶含量至92.63%,涂膜硬度至0.72,其最佳的氮丙啶与羧基的质量比为5.84;另一方面,聚碳化二亚胺能改善涂膜的附着力、柔韧性及抗冷脆性,最佳的聚碳化二亚胺与羧基的质量比为10.37.TGA曲线表明聚碳化二亚胺能提高PUD涂膜的热稳定性,而氮丙啶则降低涂膜的热稳定性.
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| 关 键 词： | 水性聚氨酯 交联改性 氮丙啶 聚碳化二亚胺 |
Crosslinking Modification of Aqueous Polyurethane Dispersions and its Properties |
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| LUO Chun-hui,QU Jin-qing,CHEN Huan-qin.Crosslinking Modification of Aqueous Polyurethane Dispersions and its Properties[J].Journal of Chemical Engineering of Chinese Universities,2009,23(4). |
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| Authors: | LUO Chun-hui QU Jin-qing CHEN Huan-qin |
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| Affiliation: | School of Chemistry and Chemical Engineering;South China University of Technology;Guangzhou 510640;China |
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| Abstract: | Anionic aqueous polyurethane (PU) contains the carboxyl groups which serve as internal emulsifier stabilizing aqueous PU dispersions (PUD); at the same time,it causes the PUD film to exhibit a high hydrophilicity. In order to improve the performances of PUD film,the PUDs were crosslinked by aziridine derivatives and polycarbodiimide,respectively. The crosslinked PUD films were characterized by FT-IR spectrum and thermogravimetric analysis (TGA); the results indicate that the aziridine derivatives and polyca... |
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| Keywords: | aqueous polyurethane dispersion crosslinked aziridine derivatives polycarbodiimide |
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