Performance Investigation of Natural Organic Acid-cured Epoxy Lignin-based Adhesives

ZHANG Zhiyan; ZHUANG Wenrong; TANG Songbo; FAN Qi; WANG Yizhi

doi:10.19554/j.cnki.1001-3563.2026.03.003

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (3) : 28-35. DOI: 10.19554/j.cnki.1001-3563.2026.03.003

Advanced Materials

Performance Investigation of Natural Organic Acid-cured Epoxy Lignin-based Adhesives

ZHANG Zhiyan^1,2, ZHUANG Wenrong², TANG Songbo³, FAN Qi^2,*, WANG Yizhi^1,*

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Abstract

The work aims to prepare environmentally friendly lignin-based adhesives, to address the issue of non-renewable raw materials in traditional petroleum-based adhesives used for wooden packaging, and explore the factors affecting on bonding performance. With enzymatically hydrolyzed lignin extracted from waste corn cobs as raw material, epoxidation modification was conducted with epichlorohydrin. Citric acid (CA), aspartic acid (AST), and salicylic acid (SA) were selected for curing and cross-linking, respectively. The effects of organic acid addition, hot-pressing temperature, and hot-pressing pressure on the bonding strength were determined through single-factor experiments and response surface methodology (RSM). The results demonstrated that Fourier transform infrared spectroscopy (FT-IR) analysis confirmed the successful epoxidation modification of lignin, and the epoxidized lignin-based adhesive cured with citric acid exhibited the best adhesive performance. The optimal process parameters obtained through RSM optimization were citric acid addition of 15.3%, hot-pressing temperature of 175.6 ℃, and hot-pressing pressure of 1.5 MPa. Under these conditions, the predicted maximum dry bonding strength could reach 1.35 MPa, which was consistent with the measured value. The bonding performance of lignin-based adhesives is significantly influenced by modification with natural organic acids. Compared with SA and AST, CA exhibits the best cross-linking reaction activity towards epoxidized lignin, resulting in the best bonding performance of the plywood produced.

Key words

lignin / epoxidized lignin / bio-based adhesives / organic acid cross-linking / gluing properties

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ZHANG Zhiyan, ZHUANG Wenrong, TANG Songbo, FAN Qi, WANG Yizhi. Performance Investigation of Natural Organic Acid-cured Epoxy Lignin-based Adhesives[J]. Packaging Engineering. 2026, 47(3): 28-35 https://doi.org/10.19554/j.cnki.1001-3563.2026.03.003

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