Journal of Guangxi Normal University(Natural Science Edition) ›› 2020, Vol. 38 ›› Issue (3): 70-79.doi: 10.16088/j.issn.1001-6600.2020.03.009

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

XU Peng, LI Chaofeng, CHANG Xinwei, ZHANG Yanwu*   

  1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou Henan 450001, China
  • Received:2019-05-23 Online:2020-05-25 Published:2020-06-11

Abstract: 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.

Key words: ketone-aldehyde resins, water solubility, solid base, synthesis process, kinetics

CLC Number: 

  • O632.4
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