文献类型：期刊文献

中文题名：高含水率重组单元辊压树脂浸渍法制备重组木及其性能

英文题名：Wood scrimber preparation and its performance by roller-pressing resin impregnation method for recombinant units with high-moisture content

作者：张亚梅[1] 周云霞[1] 祝荣先[1] 于文吉[1]

第一作者：张亚梅

机构：[1]中国林业科学研究院木材工业研究所,北京100091

年份：2025

卷号：47

期号：7

起止页码：167-176

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划(2021YFD2200601)。

语种：中文

中文关键词：高含水率重组单元;辊压树脂浸渍法;重组木;连续化生产;耐水性能;弹性模量(MOE)

外文关键词：recombinant units with high moisture content;roller-pressing impregnation method;wood scrimber;continuous production;water resistance;modulus of elasticity(MOE)

分类号：TS652

摘要：【目的】重组木的传统施胶工艺存在劳动强度大,干燥耗能高,难以实现连续化生产等技术瓶颈。针对这些问题,本研究创新性地采用辊压树脂浸渍法,直接对高含水率的重组单元进行施胶。通过系统地探究该方法对重组木物理力学性能的影响,为生产工艺的优化提供理论依据。【方法】采用辊压树脂浸渍技术,直接对含水率为30%的杨木重组单元施加酚醛树脂,并通过调控压缩率和辊压次数优化施胶量控制工艺。利用微计算机断层扫描仪、扫描电子显微镜、透射电镜表征胶液分布和微观形貌,通过红外光谱仪和X射线衍射仪解析树脂与木材界面之间的化学作用机制。此外,采用煮沸–干燥–煮沸循环测试法评估重组木的耐水性能,并通过三点弯曲测试法评估其力学性能。【结果】辊压压力和辊压次数的增加可显著提升高含水率重组单元的施胶量。与传统吊笼式浸胶法制备的重组木相比,辊压树脂浸渍法制备的重组木的吸水厚度膨胀率和吸水宽度膨胀率分别降低了41.12%和21.04%,弹性模量(MOE)增大了10.57%。辊压压力促使重组单元中的细胞裂隙扩展,胶液在负压作用下渗透至细胞腔及细胞壁内部,并与纤维素发生交联。化学分析进一步证实,酚醛树脂填充了细胞间隙并形成了三维网状结构,从而抑制木材吸湿膨胀,提升密实度与结晶度。因此,该技术使得胶液在重组单元中的分布更加均匀,显著提高了重组木的耐水性能,抑制了木材细胞吸水后的回弹现象,减少了重组木表面的“跳丝”现象,提高了板材整体性能的均匀性。同时,渗透到细胞壁中的酚醛树脂增强了重组木的MOE。【结论】高含水率重组单元辊压树脂浸渍技术通过优化胶液分布与界面结合,显著提升了重组木的耐水性和MOE。同时,该技术省去了干燥工序,有效降低了能耗。这一技术突破为实现重组单元的疏解—浸渍—干燥连续化生产提供了可行路径,为重组木生产工艺的优化和可持续发展提供了新思路和方法。
[Objective]The traditional adhesive application process for wood scrimber is labor-intensive,energy-consuming in drying,and difficult to scale up for continuous production.To address these issues,this paper innovatively employs a roller-pressing resin impregnation method to directly apply resin to units with high moisture content.The paper systematically investigates the impact of this method on the physical and mechanical properties of wood scrimber,providing theoretical support for optimizing the production process.[Method]Using roller-pressing resin impregnation technology,phenol-formaldehyde(PF)resin was directly applied to poplar units with 30%moisture content.The PF resin application process was optimized by adjusting the compression ratio and the number of roller-pressing.The distribution of resin and microstructure was characterized using micro-computed tomography,scanning electron microscopy,and transmission electron microscopy.The chemical interactions between resin and wood were analyzed using Fourier-transform infrared spectroscopy and X-ray diffraction.Additionally,the water resistance of wood scrimber was evaluated using a boiling-drying-boiling cycle test,and its mechanical properties were assessed using a three-point bending test.[Result]Increasing roller pressure and the number of presses significantly enhanced resin application in high-moisture-content units.Compared with wood scrimber produced by traditional cage-type impregnation method,the wood scrimber produced by roller-pressing impregnation method exhibited 41.12%and 21.04%reductions in thickness swelling rate and width swelling rate,respectively,along with a 10.57%increase in modulus of elasticity(MOE).The roller pressure caused further damage to the cells within the units,and the expansion of pre-existing cracks,allowing resin to penetrate into the cell cavities and cell walls under negative pressure,forming cross-links with cellulose.Chemical analysis further confirmed that PF resin filled intercellular spaces and established a three-dimensional network structure,which inhibited hygroscopic swelling and enhanced its density and crystallinity.Consequently,this technology achieved more uniform resin distribution within units,substantially improving the water resistance of wood scrimber,and inhibited cell wall spring-back upon water absorption,reduced surface bulging(jump fibers),and enhanced overall board homogeneity.Moreover,the phenolic resin that penetrated the cell walls enhanced the MOE of reconstituted wood.[Conclusion]The roller-pressing resin impregnation technology for high-moisture-content units significantly enhances the water resistance and modulus of elasticity(MOE)of wood scrimber by optimizing resin distribution and interfacial bonding.Simultaneously,this technology also reduces energy consumption by eliminating conventional drying process before gluing process.This technological breakthrough enables continuous fiber separation-impregnation-drying production workflows,providing novel approaches for optimizing manufacturing processes and promoting the sustainable development in wood scrimber.