固体碱催化水性酮醛树脂的合成  

Synthesis of Water-Soluble Ketone-Aldehyde Resins by Catalysis of Solid Base

作　　者：胥鹏 李超峰 常新威 张延武[1] XU Peng;LI Chaofeng;CHANG Xinwei;ZHANG Yanwu(School of Chemical Engineering and Energy,Zhengzhou University,Zhengzhou Henan 450001,China)

机构地区：[1]郑州大学化工与能源学院,河南郑州450001

出　　处：《广西师范大学学报（自然科学版）》2020年第3期70-79,共10页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金(21574119)。

摘　　要：酮醛树脂由于良好的溶解性和兼容性,广泛用于提高涂层的光泽度和附着力。以固体碱重水合镁铝水滑石催化合成甲醛和环己酮反应生成低相对分子质量的酮醛树脂,探究其水溶性和反应动力学,探索反应条件对树脂产率及黏度的影响,优化水性酮醛树脂的合成工艺。结果表明:反应过程中羟醛缩合与分子间脱水同时进行;甲醛与环己酮的物质的量比为1.2∶1.0、反应时间11 h、反应温度90℃、催化剂水滑石加入量为环己酮质量的10%为较佳反应条件,合成的树脂产率为86.42%,黏度为0.46 Pa·s,能与水任意比例互溶。Ketone-aldehyde resins are widely used to improve the gloss and adhesion of coatings due to its good solubility and compatibility.It’s inevitable to develop waterborne coatings because of environmental problems caused by the generation of VOC during the production and use of solvent-based coatings.Therefore,coating additives such as ketone-aldehyde resins must meet the demand for being waterborne.Ketone-aldehyde resins with low molecular weight were synthesized by the catalysis of solid base hydrotalcite and their water solubility were investigated.The reaction kinetics was primarily studied by monitoring the consumption of formaldehyde during the reaction.The effects of reaction conditions on the yield and viscosity of resins were investigated,and the synthesis process of water-soluble ketone-aldehyde resins was optimized.The results showed that aldol condensation and intermolecular dehydration occured simultaneously during the reaction.Under more suitable reaction conditions(molar ratio of formaldehyde to cyclohexanone:1.2∶1.0,reaction temperature:90°C and amount of hydrotalcite added:10%by mass of cyclohexanone),the yield and viscosity of resins were 86.42%and 0.46 Pa·s respectively.

关 键 词：酮醛树脂 水溶性 固体碱 合成工艺 动力学 

分 类 号：O632.4[理学—高分子化学]