最新刊期

      LIU Tong-da, HUANG Teng-hua, PAN Li-cheng, ZHANG Ting, DU Guan-ben, YANG-Long

      DOI：10.12326/j.2096-9694.2026002
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      摘要：To address issues such as insufficient sustainability and high raw material costs of isocyanate adhesives in wood-based panel applications, while further expanding their scope of application in the field of environmentally friendly wood-based panels, this study used urea-based hyperbranched amino resin (UHA) and biomass-derived citric acid (CA) as composite modifiers to modify polymeric methylene diphenyl diisocyanate (pMDI) adhesives synergistically. A ternary wood adhesive (UCM) was successfully developed and applied in the production of Eucalyptus three-layer plywood and the influence of UHA addition amount on the microstructure, physical and chemical properties, chemical structure of UCM, as well as the bonding strength of UCM plywood was investigated. The results indicated that the optimal compounding process for the UCM adhesive is a UHA-CA-pMDI mass ratio of 7:2:1 (with the pMDI content being only 10%), the various components of the adhesive form an effective cross-linked network, enhancing the adhesive's cohesion and interface bonding strength. The optimal process conditions for preparing the glued specimens using this adhesive system are a hot-pressing temperature of 180 °C, a hot-pressing time of 8 minutes, and a hot-pressing pressure of 1.5 MPa. Under the preparation conditions of a hot-pressing temperature of 180 °C, hot-pressing time of 8 min, and hot-pressing pressure of 1.5 MPa, the resulting plywood complies with the standard GB/T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-Based Panels and Decorative Wood-Based Panels". The dry strength, cold water strength, hot water strength, and boiling water strength of the specimens were 1.24, 1.26, 1.08, and 0.92 MPa, respectively. Notably, the cold water strength was significantly higher than that of the pMDI-bonded plywood, while no statistically significant differences were observed in dry strength, hot water strength, or boiling water strength. This study effectively reduces the amount of pMDI adhesive used, demonstrating favorable economic and environmental benefits.  
      关键词：isocyanate adhesive;hyperbranched polymer;citric acid;three-layer plywood;bonding performance   
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      更新时间：2026-04-27

      ZHANG Jie, LUO Shu-pin, GAO Li, GUO Wen-jing

      DOI：10.12326/j.2096-9694.2025144
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      摘要：With the continuous development of the particleboard industry, its major applications have expanded beyond traditional furniture panels to emerging fields such as wall panels, large-format countertops, and tall door panels. These new application scenarios impose higher requirements for low-density yet high-strength particleboard. To address the distinct structural characteristics of the surface and core layers in three-layer particleboard, a synergistic double-layer polyurethane adhesive modification strategy based on epoxidized soybean oil and isocyanate was proposed. In the control group, both the surface and core layers were bonded with polymeric methylene diphenyl diisocyanate (pMDI). In the modified group, the surface layer was bonded with a high-strength epoxidized soybean oil-modified polyurethane adhesive (EPA), while the core layer was bonded with a lightweight foamable polyurethane adhesive (FPU). Three-layer particleboards with target densities of 0.50, 0.55, and 0.60 g/cm³ were manufactured from poplar (Populus sp.) particles of different geometries. The mechanical properties, including modulus of rupture (MOR), modulus of elasticity (MOE), and internal bond strength (IB), as well as the 24 h thickness swelling and water absorption, were evaluated. In addition, scanning electron microscopy (SEM) was used to examine the microstructure and adhesive distribution in the panels, so as to elucidate the mechanisms by which the adhesives regulated panel performance. The results showed that, at all three low-density levels, the modified boards achieved a synergistic improvement in both weight reduction and performance. In particular, the modified board with a density of 0.55 g/cm³ (10% adhesive content and gradient hot pressing at 190 °C) exhibited MOR, MOE, and IB values of 12.3 MPa, 1710 MPa, and 0.54 MPa, respectively, meeting the requirements for Type P2 particleboard specified in the Chinese national standard GB/T 4897—2015, Particleboard. Microscopic observations revealed that a three-dimensional porous cross-linked network was formed in the core layer of the modified board, which was the key to achieving both low density and high strength. Overall, the synergistic double-layer pMDI-based adhesive modification strategy not only reduced pMDI consumption, but also improved the overall performance of the boards, thereby providing a feasible technical route for the manufacture of lightweight high-strength particleboard.  
      关键词：lightweight high-strength particleboard;epoxidized soybean oil;foamable polyurethane adhesive;isocyanate adhesive;3D porous crosslinked network   
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      更新时间：2026-04-13
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