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bce ›› 2017, Vol. 51 ›› Issue (1): 20-26.doi: 10.3969/j.issn.1673-5854.2017.01.004

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Inhibition of Free Formaldehyde in Synthesis of Urea-formaldehyde Resin

ZHAO Houkuan1,2, WANG Peng1,2, XIE Xingpeng3, YE Zhezi1,2, XIE Yimin1,2   

  1. 1. Research Institute of Pulp and Paper Engineering, Hubei University of Technology, Wuhan 430068, China;
    2. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China;
    3. Wuhan Institute of Bioengineering, School of Pharmacy, Wuhan 430415, China
  • Received:2016-06-12 Online:2017-01-30 Published:2017-01-23

Abstract: The methods of inhibiting free formaldehyde in the synthesis of urea-formaldehyde resins are investigated. The optimization of synthesis process and the effects of tannic acid and water-soluble alkali lignin as formaldehyde-reducing agents are discussed. The results show that the optimum conditions are the molar ratio of formaldehyde to urea 1.2:1, the temperature and pH value in condensation reaction 95℃ and 5.0, the dosage of melamine 2% of the total mass of urea and formaldehyde and the dosage of polyvinyl alcohol 1% of the urea mass. The content of free formaldehyde in the product obtained under the optimum conditions can be reduced to 0.18% with the viscosity of 16.2s and solid content of 52.96%. And the storage time is more than 45d. When the dosage of tannic acid is 2% of urea, the content of formaldehyde in the product can be further reduced to 0.09% with the solid content of 53.44% and viscosity of 16.9s. The content of free formaldehyde is 0.15% when the dosage of soluble alkali lignin is 5% of urea and the other characteristics are similar to the sample with addition of tannic acid.

Key words: urea-formaldehyde resin, free formaldehyde, formaldehyde-reducing agent, tannic acid, lignin

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