华南理工大学学报(自然科学版) ›› 2009, Vol. 37 ›› Issue (6): 53-57.

• 化学化工 • 上一篇    下一篇

水性聚氨酯-丙烯酸酯的交联改性及涂膜性能

瞿金清 罗春晖 陈焕钦   

  1. 华南理工大学 化学与化工学院, 广东 广州 510640
  • 收稿日期:2008-07-15 修回日期:2008-10-27 出版日期:2009-06-25 发布日期:2009-06-25
  • 通信作者: 瞿金清(1970-),男,副研究员,博士,主要从事精细化学品的合成与应用研究. E-mail:cejqqu@scut.edu.cn
  • 作者简介:瞿金清(1970-),男,副研究员,博士,主要从事精细化学品的合成与应用研究.
  • 基金资助:

    粤港关键领域重点突破项目(B10-B2050260)

Crosslinking Modification and Film Properties of Waterbrone Polyurethane-Acrylate

Qu Jin-qing  Luo Chun-hui  Chen Huan-qin   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510650, Guangdong, China
  • Received:2008-07-15 Revised:2008-10-27 Online:2009-06-25 Published:2009-06-25
  • Contact: 瞿金清(1970-),男,副研究员,博士,主要从事精细化学品的合成与应用研究. E-mail:cejqqu@scut.edu.cn
  • About author:瞿金清(1970-),男,副研究员,博士,主要从事精细化学品的合成与应用研究.
  • Supported by:

    粤港关键领域重点突破项目(B10-B2050260)

摘要: 分别采用氮丙啶(AZ)和聚碳化二亚胺(PCDI)对水性聚氨酯-丙烯酸酯(PUA)复合乳液进行交联改性.傅里叶红外光谱分析表明,PUA中的羧基(-COO-)参与了交联反应.涂膜性能测试表明:AZ能显著提高涂膜的凝胶量和硬度,改善涂膜的耐水性、耐溶剂性和耐污性,AZ与-COO-的最佳质量比为6.60;而PCDI能增强涂膜的柔韧性,显著改善涂膜的抗冻融性,PCDI与-COO-的最佳质量比为16.67.热重分析发现,AZ和PCDI均可提高涂膜的热稳定性.

关键词: 水性聚氨酯, 丙烯酸, 复合乳液, 交联改性, 氮丙啶, 聚碳化二亚胺

Abstract:

Polyurethane-acrylate (PUA) hybrid emulsions were crosslinked by aziridine (AZ) derivatives and polycarbodiimide ( PCDI), respectively. FT-IR spectra of the emulsions show that the carboxyls (--COO-) in PUA react with AZ and PCDI in the crosslinking process. Test results of PUA film properties indicate that AZ greatly improves the water-, solvent- and pollution- resistance due to the increase of the gel content and its hardness, especially at a AZ-to-carboxyl mass ratio of 6. 60 ; and that PCDI remarkably improves the flexibility and freezing-thawing resistance, especially at a PCDI-to-carboxyl mass ratio of 16.67. Moreover, the TG curves show that both AZ and PCDI improve the thermal stability of PUA films.

Key words: polyurethane, acrylate, hybrid emulsion, crosslinking modification, aziridine, polycarbodiimide