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20 g of PEG-2000 and 100 ml of toluene are place into a four-necked vessel equipped with a stirrer, a flux condenser, a thermometer, and an inlet system for nitrogen gas. With stirring, 3.83 g of 2,4-Diisocyanatotoluene (TDI) is added dropwise. After addition, the temperature is increased to 55 oC and the mixed solution is stirred for 2h, then 45 mg of hydroquinone, 4.6 of hydroxyethyl acrylate (HEA), and 0.5 ml of dibutytin dilaurate are added and the reaction is continue to another 2h at 85 oC to obtain the precursor solution. ÔÚ¼×±½ÖмÓÈëpeg2000£¬È»ºóÊÇTDI£¬½Á°è2hºó¼ÓÈë¶Ô¶þ±½·Ó45mg£¬»¹ÓÐHEAºÍ¶þÔ¹èËá¶þ¶¡»ùÎý·´Ó¦Ò»¶Îʱ¼ä¡£ [ Last edited by wellok101 on 2008-9-3 at 21:44 ] |
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