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Phenolic resin is an excellent adhesive material, but it has drawbacks such as the emission of toxic substances and the use of non-renewable raw materials. To effectively address these issues, a method of modifying phenolic resin with lignin is proposed. Lignin is modified under alkaline conditions, and then lignin-based phenolic resin is synthesized by the ortho-para substitution reaction of the modified lignin with phenol. The characteristics of phenolic resins prepared with different lignin substitution rates are investigated using Fourier transform infrared spectroscopy(FTIR) and ultraviolet spectrophotometry(UV), and the solid content and bonding strength of the modified adhesives are systematically tested. Through single-factor experiments, the optimal experimental conditions are determined to be an aldehyde-phenol mass ratio of 1.5∶1, a lignin substitution rate of 30%, and an alkali dosage of 15%. Under these conditions, the solid content of the prepared adhesive is 52.33%, and the bonding strength reaches 2.21 MPa. Woodbased panels are bonded using kenaf lignin-modified phenolic resin, industrial lignin-modified phenolic resin, and unmodified phenolic resin adhesives, and the bonding strength of different panels is tested. The results show that the bonding strength of industrial lignin-modified phenolic resin is 56% of that of unmodified phenolic resin, while the bonding strength of kenaf lignin-modified phenolic resin is 79% of that of unmodified phenolic resin, indicating that the prepared kenaf lignin-based phenolic resin is superior to industrial lignin-based phenolic resin.
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Basic Information:
DOI：10.12194/j.ntu.20240201001
China Classification Code:TQ433.431
Citation Information:
[1]WANG Shixing,Lü Wanwan,ZHAO Runge ,et al.Preparation and application of lignin-modified phenolic resin adhesive[J].Journal of Nantong University (Natural Science Edition),2024,23(02):82-88.DOI:10.12194/j.ntu.20240201001.
Fund Information:
生物多糖纤维成形与生态纺织国家重点实验室自主课题（RZ2200002465）
2024-04-16
2024-04-16
2024-04-16