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標題: Study on Urea-Biuret Based Water-dispersible Polyisocyanates
作者: 陳慶鴻
Chen, Chinghung -
關鍵字: isocyanate;異氰酸鹽;waterborne polyurethanes;urea;biuret;Montmorillonite;水性聚胺酯;脲;素;縮二脲;蒙脫土
出版社: 化學工程學系
Water dispersible polyisocyanates (WDPI), or so called “hardeners”, can be used for enhancing physical properties of waterborne polyurethanes(WBPU) through crosslinking and structural interactions. The object of this research has attempted to correlate the composition variations in WDPI with the adhesive performances of WBPU.
This research has synthesized a number of urea and biuret types WDPIs by reacting low percentages of commercially available, highly ethoxylated polyether mono- and di-amines (Jeffamine) with 1,6-hexamethylene diisocyanate trimer (HDI Trimer). The new urea and biuret derivatives synthesized were then added to WBPU to test their adhesive performances. We have found that low viscosity biuret-based WDPI are particularly effective in enhancing the green strength of WBPU in adhesive testings.
In yet another research, a few percent of completely defoliated Montmorillonite have been added to WBPU and investigated the possible enhancement of WBPU's physical properties. Except for slight changes in elevation in modulus of the resulting nanocomposite, there were no great enhancement of mechanical properties found. It seems that the defoliated Montmorillonite has not being stabilized in the WBPU solution. More formulation change in WBPU seems needed in this effort.

Appears in Collections:化學工程學系所

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