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75 G of a cresol-formaldehyde epoxy novolac resin having an average epoxide equivalent weight(EEW) of about 220 &an average epoxy functionality of about6 containing 3536 ppm hydrolyzable chloride by weight was dissolved in 75 g of a 75/25 by weight mixtrue of methyl ethyl ketone (EK) & toluene 0.38 G(0.5 weight percent based on epoxy resin) of polyethylene glycol having an average molecular weight of about 400 was added to the soluton & the solution was heated to 80℃ with stirring. 1.05G of 50 percent aqueous potassium hydroxide (1.25 eq.KOH to 1 eq.of hydrolyzable chloride)was added all at once &the reaction mixtrue was maintained at 80℃ for 2 hours (7200s) with good agitation.
the, reaction mixture was diluted to 20 percent resin concentration with MEK/toluene solvent mix, neutralized with dilute H3PO & then washed with water 3 to 4 times to remove NaCl.
The organic phase from the water washes was placed on a rotary evaporator under a full, vacuum & 170℃ to remove the solvent completely.A purified cresol epoxy novolac resin with a hydrolysable chloride content of 7 ppm was obtained.
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75 G 甲酚甲醛環氧novolac 樹脂有一平均環氧化物等效weight(EEW) 大約220 about6 的&an 平均環氧功能包含3536 ppm hydrolyzable 氯化物由重量被溶化了在75 g 中75/25 由甲醇乙基酮(EK) 重量mixtrue & 甲苯0.38 G(0.5 重量百分之根據環氧樹脂) 聚乙二醇有平均分子量大約400 增加了來soluton & 解答被加熱了到80 嗎? 以攪動。百分之50 1.05G 含水+氧化鉀(1.25 eq.KOH 到1 eq.of hydrolyzable chloride)was 增加了&the 反應mixtrue 同時被維護了在80? 2 個小時(7200s) 以好鼓動, 反應混合物被稀釋了對百分之20 樹脂集中用MEK/toluene 溶劑混合, 被中立化與稀釋H3PO & 用水然後被洗滌了3 到4 次取消NaCl 。有機階段從水洗滌被安置了在一臺旋轉蒸發儀在充分, 真空& 170 之下? 取消溶劑completely.A 被淨化的甲酚環氧novolac 樹脂以7 ppm 一個hydrolysable 氯化物內容被獲得了。
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