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<p>The use of glyoxal to replace formaldehyde for preparing wood adhesive has been considered as an effective way to address the harm of formaldehyde on human health and indoor air. However, the properties of glyoxal-based resins via a continuous process were poor, especially the water resistance was particularly low compared with the formaldehyde-based resins. Here, a new glyoxal-polyvinylamine-urea (GPU) resin with excellent water resistance was developed in this work by using polyvinylamine (PVAm) as a modifier agent to enhance the water resistance of glyoxal-based resins. The bonding strength and water resistance of this new glyoxal-based resin were evaluated via measuring mechanical properties of three-ply plywood produced in our laboratory. The structural features of this resin were characterized by fourier transform infrared spectroscopy (FT-IR), electrospray ionization mass spectrometry (ESI–MS) and <sup>13</sup>C nuclear magnetic resonance (<sup>13</sup>C-NMR), chemical cross-linking among PVAm, urea and glyoxal could be formed. Their curing and thermal behavior were also explored. This resin has a fast curing rate and good thermal stability, and the best dry bonding strength of plywood was 2.37&#xa0;MPa, and the wet bonding strength was 1.10&#xa0;MPa and 0.71&#xa0;MPa after being immersed in cold water for 24&#xa0;h and 63 ℃ hot water for 3&#xa0;h, respectively. The enhanced water resistance can be explained by the formation of a better cured resin network verified from their structural results.</p> Graphical abstract <p></p>

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A simple pathway for the preparation of an environmental and high performance glyoxal-based adhesive for plywood

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • Guowei Liu,
  • Xin Zhang,
  • Hongyan Wang,
  • Jingjing Liao,
  • Hui Wang,
  • Xiaojian Zhou

摘要

The use of glyoxal to replace formaldehyde for preparing wood adhesive has been considered as an effective way to address the harm of formaldehyde on human health and indoor air. However, the properties of glyoxal-based resins via a continuous process were poor, especially the water resistance was particularly low compared with the formaldehyde-based resins. Here, a new glyoxal-polyvinylamine-urea (GPU) resin with excellent water resistance was developed in this work by using polyvinylamine (PVAm) as a modifier agent to enhance the water resistance of glyoxal-based resins. The bonding strength and water resistance of this new glyoxal-based resin were evaluated via measuring mechanical properties of three-ply plywood produced in our laboratory. The structural features of this resin were characterized by fourier transform infrared spectroscopy (FT-IR), electrospray ionization mass spectrometry (ESI–MS) and 13C nuclear magnetic resonance (13C-NMR), chemical cross-linking among PVAm, urea and glyoxal could be formed. Their curing and thermal behavior were also explored. This resin has a fast curing rate and good thermal stability, and the best dry bonding strength of plywood was 2.37 MPa, and the wet bonding strength was 1.10 MPa and 0.71 MPa after being immersed in cold water for 24 h and 63 ℃ hot water for 3 h, respectively. The enhanced water resistance can be explained by the formation of a better cured resin network verified from their structural results.

Graphical abstract