Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (6): 53-57.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

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）

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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