Shan-xia Xiong, Jian-lei Kuang, Qian-fang Zheng, Ting Xiao, Wen-xiu Liu, Qi Wang, Peng Jiang, and Wen-bin Cao, Effects of Si/Al, Na/Al, and H2O/Na2O molar ratios on formaldehyde barrier properties of inorganic aluminosilicate coatings, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-020-2197-7
Cite this article as:
Shan-xia Xiong, Jian-lei Kuang, Qian-fang Zheng, Ting Xiao, Wen-xiu Liu, Qi Wang, Peng Jiang, and Wen-bin Cao, Effects of Si/Al, Na/Al, and H2O/Na2O molar ratios on formaldehyde barrier properties of inorganic aluminosilicate coatings, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-020-2197-7
Research Article

Effects of Si/Al, Na/Al, and H2O/Na2O molar ratios on formaldehyde barrier properties of inorganic aluminosilicate coatings

+ Author Affiliations
  • Corresponding authors:

    Jian-lei Kuang    E-mail: jlkuang@ustb.edu.cn

    Wen-bin Cao    E-mail: wbcao@ustb.edu.cn

  • Received: 27 July 2020Revised: 17 September 2020Accepted: 19 September 2020Available online: 19 September 2020
  • Wood-based panels containing urea-formaldehyde resin result in the long-term release of formaldehyde and threaten human health. In this study, inorganic aluminosilicate coatings prepared by combining metakaolin, silica fume, NaOH, and H2O were applied to the surfaces of wood-based panels to obstruct formaldehyde release. The Si/Al, Na/Al, and H2O/Na2O molar ratios of the coatings were regulated to investigate their effects on the structure and formaldehyde-resistant barrier properties of coatings. Results showed that the cracks in the coatings gradually disappeared and the formaldehyde resistance rates of the barrier increased as the Si/Al molar ratio was increased from 1.6 to 2.2. This value also increased as the Na/Al molar ratio was increased from 0.9 to 1.2 because of the improvement of the degree of polymerization. As the H2O/Na2O molar ratio was increased from 12 to 15, the thickness of the dry film decreased gradually and led to the reduction in the formaldehyde resistance rate. When the Si/Al, Na/Al, and H2O/Na2O molar ratios were 2.2, 1.2, and 12, respectively, the inorganic aluminosilicate coating showed good performance as a formaldehyde-resistant barrier and its formaldehyde resistance rate could reach up to 83.2%.
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