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ºÏ³É²½ÖèµÄÔÎÄ£º I . Preparation of Cyclohexanone-Formaldehyde-Resin The cyclohexanone-formaldehyde (CF) resin was prepared according to ref[1] Into a three-necked flask 100 g of cyclohexanone, 40 g of cyclohexane, and 24.5 g of formaline were added and under stirring heated to a temperature of 60"C, then 0.18 ml of 20% NaOH were added in three equal portions. When the temperature of the mixture rose to 70- 75 "C refluxing began. Then 73.5 g of formaline and 1.80 ml of 20% NaOH were mixed and added continuously at a gradually increasing rate sufficient to maintain vigorous refluxing. After two hours, the reaction was completed and the mixture was neutralized with dilute acetic acid. It was then washed several times with hot water and dried azeotropically with toluene. ÎÊÌ⣺Ï»®Ïß²¿·ÖÔõôÀí½â£¬Êǽ«0.18mlµÄÉÕ¼î·ÖÈý´Î¼ÓÈ룬»¹ÊǼÓÈý´Î£¬Ã¿´Î0.18ml£¿ |
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