科研之友
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摘要
Bisphenol A, a toxic chemical, is widely used in the preparation of epoxy resins. Therefore, the use of harmless biomass-based raw materials to replace bisphenol A in the preparation of epoxy resin has attracted extensive attention. A demethylated-lignin-based epoxy resin adhesive was prepared. After lignin was modified in a LiBr/HBr system, the phenolic hydroxyl group content of the obtained demethylation lignin (DL) increased to 6.19 mmol g(-1), and the tensile strength of the as-prepared DL-modified adhesive (-OH content of the DL = 6.19 mmol g(-1)) increased to 62.50 MPa, which was much higher than the adhesive modified by raw lignin (38.89 MPa). Due to its excellent crosslinking density, the DL-modified adhesive retained more than 85% of its tensile shear strength performance after being soaked in water for 48 h or frozen at -25 degrees C for 48 h. Therefore, this adhesive has a wide range of application prospects in furniture and plywood manufacturing.
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单位大连工业大学
