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。
Acetophenone-cyclehexanone- formaldehyde resin was synthesized by polycondensation of aeetophenone, cyclehexanone and formaldehyde with NaOH as catalyzer.The effect of molar ratio of cyclohexane to acetophenonoeon,pre- reaction time and the feeding mole of formaldehyde on softening point and hydroxyl value of the resin was studied. The resin was charactetized 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 rag KOH/g was prepared when the molar ratio of formaldehyde to ketone was 1.3,the molar ratio of cyclohexanone to acetoghenone was 1.0,amount of NaOH was 3.0wt%, pre- reaction time was 1,5 hours and formldehyde was fed for one time,The FT- IR and ^H- NMR results showed that the pre- reaction process was favourable for acetophenone to take part in the polyeondensation.
出处
《化学与粘合》
CAS
2006年第5期295-298,共4页
Chemistry and Adhesion
基金
广东省重点科技攻关项目(编号:2005B10301004)
关键词
苯乙酮
环己酮
甲醛
树脂
缩聚
acetophenone
cyclehexanone
formaldehyde
resin
polycondensation
