Performance properties of self-curing aqueous-based PU system with tri-glycidyl phosphate curing agent |
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| Authors: | Shih-Chieh Wang Po-Cheng Chen Jing-Zhong Hwang Jen-Taut Yeh Chi-Yuan Huang Kan-Nan Chen |
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| Affiliation: | (1) Department of Chemistry, Nano-tech Research Center, Tamkang University, Tamsui, Taiwan, 251;(2) Department and Graduate School of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan;(3) Faculty of Chemistry and Material Science, Hubei University, Wuhan, China;(4) Department of Material Engineering, Tatung University, Taipei, Taiwan;(5) Department of Chemical and Materials Engineering, Tamkang University, Tamsui, Taiwan; |
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| Abstract: | Amino-terminated and carboxylic acid containing aqueous-based polyurethane (PU) dispersion was prepared by a conventional
NCO-terminated PU prepolymer process by using isophorone diisocyanate (IPDI), polypropylene glycol-2000 (PPG-2000) and 2,2′-dimethylolpropanoic
acid (DMPA) as the key raw materials. A new curing agent, tri-glycidyl phosphate (POG) was prepared from a substitution reaction
of phosphorus oxychloride and glycidol. A single-component self-curable aqueous-based PU system is obtained from an addition
of POG into aqueous-base PU dispersion and its curing reaction occurred among POG oxiranes and PU amino groups immediately
after hydrophobic POG diffused into PU particles (as polymeric micelles). The cross-linked PU resins were resulted on drying
at ambient temperature. Original PU dissolved into THF and ethanol. And its gel content increased to 90.1% and sample loss
in ethanol decreased to 9.2% of this self-cured PU system with 5.0 phr POG. The limiting oxygen index (LOI) value is 20 of
original PU and its LOI reached to 27 of this same self-cured PU system. The improved mechanical and thermal properties of
those self-cured PU resins were evaluated, respectively in this report. |
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