【摘要】 以苯乙酮、环己酮和甲醛为原料,氢氧化钠为催化剂合成苯乙酮-环己酮-甲醛共缩聚树脂,研究了环己酮/苯乙酮摩尔比、预反应时间、甲醛加料方式等对树脂软化点和羟值的影响,借助FT-IR及1H-NMR对聚合产物进行了表征。发现在醛酮摩尔比为1.3、环己酮/苯乙酮摩尔比为1.0、氢氧化钠用量为3.0%(质量分数)、预反应时间为1.5 h、甲醛一次性加入时,可获得软化点为51.3℃、羟值为119.0 mg KOH/g的苯乙酮-环己酮-甲醛树脂。FT-IR和1H-NMR结果表明通过预反应有利于苯乙酮参与共缩聚反应。更多还原

【Abstract】 Acetophenone-cyclohexanone-formaldehyde resin was synthesized by polycondensation of acetophenone,cyclohexanone and formaldehyde with NaOH as catalyzer.The effect of molar ratio of cyclohexanone to acetophenoneon,pre-reaction time and the feeding mode of formaldehyde on softening point and hydroxyl value of the resin was studied.The resin was characterized by FT-IR and ~1H-NMR.It was found that acetophenone-cyclohexanone-formaldehyde resin with softening point of 51.3℃ and hydroxyl value of 119.0 mg KOH/g was prepared when the molar ratio of formaldehyde to ketone was 1.3,the molar ratio of cyclohexanone to acetophenone was 1.0,amount of NaOH was 3.0wt%,pre-reaction time was 1.5 hours and formaldehyde was fed for one time.The FT-IR and ~1H-NMR results showed that the pre-reaction process was favourable for acetophenone to take part in the polycondensation.更多还原