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標題: The Formulation and application of high functional and crosslinking water borne polyurethane/polyurea
作者: 陳國華
關鍵字: WBPU;水性聚胺酯;PU/P-urea;crosslinker;水性聚胺酯/尿素;芳香族;交聯型
出版社: 化學工程學系
Recent environmental concerns, heightened safety requirements in the plants, and rigorous governmental VOC regulations have great impacts on PU industry today. Hence, development of greener products such as water borne PU (WBPU) and PU/P-urea (WBPU/P-urea) has received a greater emphasis in the industrial as well as academic research.
In this research, improvements on the product qualities of WBPU and WBPU/P-urea were achieved through process and formulation changes. First of all, it was found that PU of high molecular weight with hydrophilic groups could be synthesized first and then dispersed in water. Further enhancement of WBPU formulation also was found by increase the hard segment ratios in the formulation or using about 20 mole% 2-ethyl-(hydroxymethylpropane-1,3-diol (TMP) or pantaerythritol as a crosslinker in the formulation. However, in all these efforts the overall performances of WBPU were still not as good as our standard WBPU/P-urea formulation.
In another research effort, we found that addition of about 10 mole% of the crosslinkers directly to the standard WBPU/P-urea formulation could result in profound enhancement of product properties. Water dispersible crosslinkers such as Jeffamine T-403 (three functional polyether amines) and Desmondur DN (three functional isocyanates based HDI trimers) were found to be the two most effective additives.
Preparation of these cross-linked WBPU and WBPU/P-urea could be easily be adapted for scaling up in the industry because of similarity with the conventional process.

另一方面水性聚胺酯/尿素的研究中,發現只要在配方中增加少許交聯劑(Desmodur® DN或Jeffamine® T-403)在交聯密度(10%),所形成之水性(聚氨酯/尿素)的性質,即可得到大幅度的提升。
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