Penetration of Isocyanates Adhesive in Eucalyptus Wood Particleboards and Mechanical Properties of Bonding Interphase

LYU Cheng-long; YAO Yan; WANG Jun-feng; XI Jing-yu; LI Wan-zhao; WANG Xin-zhou

doi:10.12326/j.2096-9694.2022062

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Penetration of Isocyanates Adhesive in Eucalyptus Wood Particleboards and Mechanical Properties of Bonding Interphase
1.College of Materials Science and Engineering，Nanjing Forestry University，Nanjing 210037，Jiangsu，China
2.Nanjing Gongda Construction Technology Co.，Ltd.，Nanjing 211800，Jiangsu，China
3.Guangxi Zhuang Autonomous Region Forestry Research Institute，Nanning 530002，Guangxi，China
4.Dareglobal Technologies Group Co. Ltd.，Danyang 212300，Jiangsu，China
Vol. 36, Issue 6, Pages: 88-94(2022)
DOI： 10.12326/j.2096-9694.2022062

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吕城龙,姚艳,王军锋等.异氰酸酯胶黏剂在桉木刨花板中的渗透及界面力学性能[J].木材科学与技术,2022,36(06):88-94.

LYU Cheng-long,YAO Yan,WANG Jun-feng,et al.Penetration of Isocyanates Adhesive in Eucalyptus Wood Particleboards and Mechanical Properties of Bonding Interphase[J].Chinese Journal of Wood Science and Technology,2022,36(06):88-94.
吕城龙,姚艳,王军锋等.异氰酸酯胶黏剂在桉木刨花板中的渗透及界面力学性能[J].木材科学与技术,2022,36(06):88-94. DOI： 10.12326/j.2096-9694.2022062.

LYU Cheng-long,YAO Yan,WANG Jun-feng,et al.Penetration of Isocyanates Adhesive in Eucalyptus Wood Particleboards and Mechanical Properties of Bonding Interphase[J].Chinese Journal of Wood Science and Technology,2022,36(06):88-94. DOI： 10.12326/j.2096-9694.2022062.

摘要

采用荧光显微技术、扫描电子显微镜结合元素分析法以及纳米力学分析技术，分析不同施胶量下的异氰酸酯胶黏剂与木刨花的界面结构和力学性能。结果表明：增加施胶量可以提高胶黏剂在刨花中的渗透深度，在施胶量为6%时，胶黏剂的渗透深度最大，平均渗透深度和有效渗透深度分别为1 074 μm和712 μm。胶黏剂渗透可以提高刨花细胞壁的弹性模量和硬度，但施胶量对界面力学性能无明显影响；在施胶量为6%时，界面区域刨花细胞壁的弹性模量为20.04 GPa，硬度为0.69 GPa。施胶量从3%增至6%时，刨花板的内结合强度和2 h吸水厚度膨胀率得到改善，但进一步增至9%时，板材性能并未提高。综合考虑，建议采用异氰酸酯胶黏剂制备刨花板时，施胶量宜控制在6%左右。

Abstract

The microstructure and mechanical properties of bonding interphase between isocyanates adhesive and Eucalyptus wood particles with different resin content were investigated by using fluorescence microscopy, scanning electron microscopy, energy-dispersive spectroscopy, and nanoindentation. Results indicated that the penetration depth of adhesive into wood increased with the increasing resin content. When the resin content was 6%, the average penetration depth and effective penetration depth reached 1 074 μm and 712 μm, respectively. The penetration of adhesive into wood structures made a positive contribution to the elastic modulus (,E,r,) and hardness (,H,) of wood cell walls in the bonding interphase. However, the resin content showed no significant effect on the mechanical properties of bonding interphase. The ,E,r, and ,H, values of cell walls after adhesive penetration was 20.04 GPa and 0.69 GPa under the resin content of 6%, respectively. Meanwhile, the internal bonding strength and thickness swelling were improved as the resin content increased from 3% to 6%. When the resin content increased to 9%, the bonding performance was not improved. It was suggested that the resin content needs be controlled at about 6% when isocyanates adhesive was used to prepare particleboards.

关键词

刨花异氰酸酯渗透胶合界面纳米压痕力学性能

Keywords

particlesisocyanatepenetrationbonding interphasenanoindentationmechanical properties

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