Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 176, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2021.114390
Keywords
Dialdehyde starch; Impregnation adhesives; Impregnated decorative paper; Toughness; Formaldehyde emission
Categories
Funding
- project of the National Nonprofit Institute Research Grant of Chinese Academy of Forestry [CAFYBB2020SY037]
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By modifying MF with polyacrylate-PEG-DAS, a cross-linked structure was formed in the impregnated decorative paper interlayer, leading to improved surface bonding strength, abrasion resistance, and reduced formaldehyde emission.
To solve the problems of brittleness and formaldehyde emission of melamine-formaldehyde (MF) impregnated decorative paper, a polyacrylate-polyethylene glycol (PEG)-dialdehyde starch (DAS) was used to modify MF. The impregnation adhesive was characterized and the properties of impregnated decorative paper and laminated to plywood were tested. DAS showed better dispersion in the compound resin and higher reactivity with MF compared to the control. The MF can react with active aldehyde groups of DAS by Schiff base reaction and hydroxyl groups of polyacrylate, PEG, and DAS. Thus, the cross-linked structure was formed in the impregnated decorative paper interlayer. At mass ratio of polyacrylate-PEG-DAS:MF= 2:1, the abrasion value, surface bonding strength, fouling capacity of plywood was comparable to MF impregnated decorative paper bonded plywood, improved with crack resistance. In addition, the formaldehyde emission was sharply lowered down with ultra-low value of 0.03 mg/L, which was classified as F* ** * for very high JAS 234:2003 standard (<= 0.3 mg/L).
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