Preparation and Performance of Urea-Based Hyperbranched Amino Resin and Citric Acid Synergistically Modified pMDI Wood Adhesives

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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Preparation and Performance of Urea-Based Hyperbranched Amino Resin and Citric Acid Synergistically Modified pMDI Wood Adhesives
1.Yunnan Province Key Lab of Wood Adhesives and Glued Products/International Joint Research Center for Biomass Materials， Southwest Forestry University， Kunming 650224， China
2.Guangxi Forestry Research Institute， Nanning 530002， China
3.Guangxi Guanglin New Material Wood Industry Group Co.， Ltd.， Nanning， Guangxi 530022，China
4.Chongzuo Guanglin Difen New Material Technology Co.，Chongzuo Guangxi， 532200， China
5.SuofeiyaHomecollection Co Ltd.， Guangzhou 511300， China
Pages: 1-11(2026)
DOI： 10.12326/j.2096-9694.2026002
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DOI：

LIU Tong-da, HUANG Teng-hua, PAN Li-cheng, et al. Preparation and Performance of Urea-Based Hyperbranched Amino Resin and Citric Acid Synergistically Modified pMDI Wood Adhesives[J/OL]. Chinese Journal of Wood Science and Technology, 2026, 1-11. DOI： 10.12326/j.2096-9694.2026002.

摘要

为解决异氰酸酯类胶黏剂在人造板应用中面临的原料不可再生、成本较高等问题，进一步拓展其在环保人造板领域的适用范围，本研究以脲基超支化氨基树脂（Urea-based hyperbranched amino resin，UHA）和生物质来源的柠檬酸（Citric acid，CA）为复合改性剂，对聚合二苯基甲烷二异氰酸酯（polymeric methylene diphenyl diisocyanate，pMDI）胶黏剂进行协同改性，成功研发出三元复配木材胶黏剂（UHA-CA-pMDI，UCM），并将其应用于桉木（

Eucalyptus

spp.）三层胶合板的制备，并探究了UHA添加量对UCM 微观形貌、理化性能、化学结构及UCM胶合板胶合强度的影响。结果表明：UCM胶黏剂的最佳复配工艺为7：2：1（UHA：CA：pMDI），此时pMDI含量仅为10%，胶黏剂各组分之间形成有效的交联网络，提升胶黏剂的内聚力与界面结合力。在热压温度180 °C、热压时间8min、热压压力1.5 MPa的条件下制备的胶合板满足GB/T 17657-2022《人造板及饰面人造板理化性能试验方法》标准。试件的干强度、冷水强度、热水强度和沸水强度分别为1.24、1.26、1.08和0.92 Mpa，其中冷水强度显著高于pMDI胶合板，干强度、热水强度、沸水强度均无统计学显著性差异。本研究有效减少了pMDI胶黏剂使用量，展现出良好的经济性与环保性。

Abstract

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

Keywords

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Preparation and Performance of Lightweight High-Strength Particleboard Based with Epoxidized Soybean Oil -Modified Polyurethane Adhesive