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

LIU Tongda; HUANG Tenghua; PAN Licheng; ZHANG Ting; DU Guanben; 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，Yunnan，China
2.Guangxi Forestry Research Institute，Nanning 530002，Guangxi，China
3.Guangxi Guanglin New Material Wood Industry Group Co.，Ltd.，Nanning 530022，Guangxi，China
4.Chongzuo Guanglin Difen New Material Technology Co.，Ltd.，Chongzuo 532200，Guangxi，China
5.Suofeiya Home Collection Co.，Ltd.，Guangzhou 511358，Guangdong，China
Vol. 40, Issue 2, Pages: 23-31(2026)
DOI： 10.12326/j.2096-9694.2026002
稿件说明：

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刘同达,黄腾华,潘礼成等.脲基超支化氨基树脂与柠檬酸协同改性pMDI木材胶黏剂的制备及性能[J].木材科学与技术,2026,40(02):23-31. DOI： 10.12326/j.2096-9694.2026002.

LIU Tongda,HUANG Tenghua,PAN Licheng,et al.Preparation and Performance of Urea-Based Hyperbranched Amino Resin and Citric Acid Synergistically Modified pMDI Wood Adhesives[J].Chinese Journal of Wood Science and Technology,2026,40(02):23-31. 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，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，制备三元复配木材胶黏剂（UHA-CA-pMDI，UCM），并将其应用于桉木（

Eucalyptus

sp.）三层胶合板的制备，探究UHA添加量对UCM胶黏剂理化性能、微观形貌、化学结构及UCM胶合板胶合强度的影响。结果表明：UCM胶黏剂的最佳配比为

（UHA）∶

（CA）∶

（pMDI）=7∶2∶1，此时pMDI用量为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、时间8 min、压力1.5 MPa的条件下制备的胶合板满足GB/T 9846—2015《普通胶合板》Ⅱ类胶合板要求，干强度、冷水强度（20±3 ℃水中浸渍24 h）、热水强度（63±3 ℃水中浸渍3 h）和沸水强度（沸水中浸渍3 h）分别为1.24、1.26、1.08和0.92 MPa。UCM胶黏剂成本为pMDI胶黏剂的50%，兼顾性能和成本，为开发新的低成本胶黏剂提供新思路。

Abstract

To address issues such as insufficient sustainability and high raw material costs of isocyanate adhesives in manufacturing of wood-based panels

while further expanding t

heir environmental friendliness

this study used urea-based hyperbranched amino resin (UHA) and biomass-derived citric acid (CA) as composite modifiers to synergistically modify polymeric methylene diphenyl diisocyanate (pMDI) adhesives. A ternary wood adhesive (UCM) was successfully developed and applied in the production of three-layer

Eucalyptus

plywood. 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 was a UHA-CA-pMDI mass ratio of 7∶2∶1 (with the pMDI content being only 10%)

and 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 this condition

the plywood could comply with with the standard GB/T 9846—2015“

Plywood for general use

”. The dry strength

cold water strength (after immersion in water at 20 ± 3 °C for 24 hours)

hot water strength (after immersion in water at 63 ± 3 °C for 3 hours)

and boiling water strength (after immersion in boiling water for 3 hours) of the specimens were 1.24 MPa

1.26 MPa

1.08 MPa

and 0.92 MPa

respectively. This study effectively reduced the usage of pMDI adhesive

demonstrating excellent economic benefits and providing new ideas for the development of new low-cost adhesives.

关键词

Keywords

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