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Application number: CN201710017229.X Application date: January 5, 2017
Publication Number: CN106700784A Publication Date: May 24, 2017
[Applicant] Nanjing Forestry University [Address] No. 159, Longpan Road, Nanjing, Jiangsu 210037
[Inventors] Pan Mingzhu; Huang Huiling; Zhao Guomin; Li Wendi; Zhang Minzhi
[Country and Province Code] 32
[Abstract] The present invention discloses a method for synergistically degrading formaldehyde in artificial boards. Specifically, zinc acetate and ethanol are added to nanocrystalline cellulose colloid, and a sol-gel reaction is performed to obtain a nanocrystalline cellulose/zinc oxide composite colloid. The composite colloid is then dispersed in a water-soluble polyacrylic acid coating to produce a water-soluble formaldehyde-reducing polyacrylic acid coating. The coating is then sprayed onto the surface of the artificial board and dried to produce the formaldehyde-reducing artificial board. After coating with the water-soluble formaldehyde-reducing polyacrylic acid coating, the formaldehyde concentration of the artificial board is reduced by 65-88%. This method uses the water-soluble polyacrylic acid coating as a carrier, leveraging the high adsorption properties of nanocrystalline cellulose and the photocatalytic properties of nanozinc oxide to synergistically degrade formaldehyde released by the artificial board. It also improves the bonding performance between the polyacrylic acid coating and the artificial board. The process is simple and easy to control.
[Sovereign Item] A method for synergistically degrading formaldehyde in artificial boards, characterized by being carried out according to the following steps: (1) weighing nanocrystalline cellulose and distilled water at a mass ratio of 0.2-0.6:100, fully mixing and ultrasonicating to obtain a nanocrystalline cellulose colloid with a mass fraction of 0.2-0.6%; (2) weighing the nanocrystalline cellulose colloid, zinc acetate and anhydrous ethanol in step (1) at a mass ratio of 1.3:(1.6-3.6):(80-120), and adding the nanocrystalline cellulose colloid and zinc acetate to anhydrous ethanol in sequence, adjusting the pH of the solution to 8-10 with sodium hydroxide, and reacting at 70-80°C for 4-5h to obtain nanocrystalline cellulose/zinc oxide. Composite colloid; (3) adding the nanocrystalline cellulose/zinc oxide composite colloid prepared in step (2) to a water-soluble polyacrylic acid coating, ultrasonicating for 15 to 30 minutes, and then stirring at 25 to 30° C. for 12 to 24 hours to form a water-soluble formaldehyde-reducing polyacrylic acid coating, and making the mass ratio of nanocrystalline cellulose/zinc oxide to polyacrylic acid in the formed water-soluble formaldehyde-reducing polyacrylic acid coating be 1 to 7:100; (4) spraying the water-soluble formaldehyde-reducing polyacrylic acid coating prepared in step (3) onto the surface of an artificial board, drying and baking at <60° C. to prepare a formaldehyde-reducing artificial board, and making the thickness of the polyacrylic acid coating in the formed formaldehyde-reducing artificial board be 0.1 to 0.25 μm.