Self-Curable Aqueous-based PU System with a New Phosphate- containing Curing Agent
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 mtaterials.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.
self-curing aqueous-based PU glycidyl phosphate polymeric micelle
Shih-Chieh Wang Po-Cheng Chen Jing-Zhong Hwang Jen-Taut Yeh Chi-Yuan Huang Kan-Nan Chen
Department of Chemistry, Tamkang University, Tamsui, Taiwan 251 Department and Graduate School of Polymer Engineering, National Taiwan University of Science and Tec Department of Material Engineering, Tatung University, Taipei, Taiwan
国内会议
太原
英文
157-162
2012-07-01（万方平台首次上网日期，不代表论文的发表时间）