22二羟甲基丙酸的合成及其应用.docx

优秀毕业论文 精品参考文献资料 摘要 2 ，2-二步圣甲基丙酸是与聚氨醋 (PU) 预聚体反应制备水性聚氨 酶的很好的扩链剂，本实验的目的是通过选择合适的催化剂，利用甲 酶与丙醒反应合成 2 ，2-二步圣甲基丙酸，并以 2 ，2-二楚甲基丙酸为 扩链剂，制备水性聚氨醋。经过查阅文献 {11[2]，找到了双功能催化剂 岑美圣基毗呢。因为注目至缩合反应既能被酸催化，又能被碱催化，双功 能催化剂 2-瓷基毗皖既有酸催化作用，又具有碱催化作用，因此对瓷 醒缩合反应制备 2 ，2-二楚甲基丙酸在理论上非常合适。在实践上， 2-泾基口比庭催化剂大大地缩短了反应时间，并且提高了产 率 。 将聚丁二醇与甲苯二异氨酸酶 (TDI) 在丙酶溶液中反应，制得 端基带-NCO 的聚氨酶预聚体。再与扩链剂 2，乙二注甲基丙酸反应， 蒸发除去丙翻得到水性聚氨醋。讨论了聚氨酶中 ←-COOH 含量与乳液 粘度的关系、 -COOH 含量与乳液粒径的关系、一 COOH 含量与涂 膜吸水率的关系，当 -COOH 含量为 10/0左右时，涂膜的微观结构规 整性较好，这样制得的水性聚氨醋产品成膜性能好，乳液 平均粒径较 小，乳液粘度底，可用于皮革喷光剂。 目标化合物乙二二瓷甲基丙酸的结构经 GCIMS 证实。 关键词: 2，乙二步圣 甲基丙酸、水性聚氨醋、聚氨酶薄膜 ABSTRACT 2，2-Bis(hydroxymethyl) propionicacid is an appropriate agent that can be converted into aqueous PU emulsion with incompletely reacted PU .It is my purpose in the design that A catalyst was found to promote the efficiency of the reaction that propionaldehyde and methy 1 aldehyde are tumed into 2，2-Bis(hydroxymethyl) propionaldehyde which is oxidized to 2，2-Bis(hydroxymethyl) propionicacid .After trials and failure，I finally find the catalyst 2-hydroxypyridine .lt has two capacities.First ，it can be taken as acidic catalyst.O!: :飞二 other hand ，it can be taken as basic catalY5t in the reaction.This 15 based on the following reaction: 。乒μ H 。 OH 、，/ . Practical妙， 2-hydroxypyridine has shortened the reaction time and raises the efficiency of the reaction. Polybutanediol and TDI (Toluene Diisocynate) were converted into incompletely reacted PU (Polyurethane) with -NCO in propanone solution. The incompletely reacted PU (Polyurethane) with 一NCO were reacted with 2，2-Bís(hydroxymethyl) propionicacid to aqueous PU. The PU was received after we evaporated propanone .In the pape巳 the effect on WCOOH (the weight of -COOH in PU) with wateradsorportion property of PU film was discussed. The film was prepared ?，f1.町 aqueous PU was put on polytetraf1uoroethylene item surface . The effect on WCOOH