摘要
为探究表芯层刨花配比对毛竹定向刨花板(BOSB)物理力学性能的影响,以毛竹刨花和酚醛树脂胶为原料,施胶量为8%,用滚筒拌料机搅拌均匀,在保持板材整体密度一致的前提下,将施胶刨花按照表层-芯层-表层质量比分别为1∶1∶1,1∶2∶1,2∶1∶2制备不同表芯层刨花配比的BOSB,通过超景深显微镜、显微CT、压汞法、剖面密度仪等对板材的形貌、内部结构、孔隙结构、密度分布进行分析,并基于密度、含水率、24 h吸水厚度膨胀率、静曲强度、弹性模量和内结合强度等指标,系统评估了表芯层刨花配比对BOSB物理力学性能的影响。结果表明:不同的表芯层刨花配比会造成BOSB的形貌、内部结构、孔隙结构和剖面密度梯度存在差异,而这种差异直接影响板材的物理力学性能。其中,表芯层刨花配比2∶1∶2的BOSB因其断面形貌及内部结构空隙较少,平均孔隙率(21.81%)和平均孔径(21.61 nm)较小,且剖面密度分布均匀,使得物理力学性能较为优异,具体表现为24 h吸水厚度膨胀率最小,低于GB/T 41715—2022《定向刨花板》中OSB/4型板材要求的28.3%,静曲强度、弹性模量和内结合强度等力学指标分别高于GB/T 41715—2022中OSB/4型板材要求的316.2%,377.8%和96%。研究证实在制备BOSB的原料一致的情况下,适当提高BOSB表层密度并降低芯层密度,增加表芯层结构差异,有利于提升板材力学性能。本研究为BOSB的结构优化设计和性能提升提供了重要理论依据。
As the global demand for sustainable construction materials grows in response to environmental concerns and the push for eco-friendly building practices,bamboo-based products have emerged as a promising solution,gaining significant attention and adoption within the industry.Unlike slow-growing wood trees,bamboo can provide a more renewable and abundant source of raw material for the construction sector.The development of bamboo-oriented strand board(BOSB)represents a significant breakthrough in the field of engineered wood-based panels,offering new opportunities for creating environmentally friendly and structurally robust construction materials.BOSB retains the desirable properties of conventional oriented strand board(OSB),including excellent dimensional stability,load-bearing capacity,and versatility in application,while incorporating the environmental benefits and performance advantages of bamboo as the primary raw materials.However,optimizing BOSB's structure and properties remains a challenge.This study investigated the influence of the face-to-core strand ratio on the physical and mechanical properties of BOSB using Phyllostachys edulis(Moso)bamboo strands as the primary material,combined with 8%phenolic resin adhesive,and uniformly mixed using a drum mixer.While maintaining a consistent overall board density,the resinated strands were allocated in face-core-face mass ratios of 1∶1∶1,1∶2∶1,and 2∶1∶2 to produce BOSBs with varying face-to-core strand ratios.The boards'morphology,internal structure,pore structure,and density distribution were analyzed using the ultra-depth-of-field microscopy,micro-computed tomography,mercury intrusion porosimeter,and X-ray densitometry,respectively.Physical and mechanical properties were evaluated based on their density,moisture content,24-hour thickness swelling,modulus of rupture,modulus of elasticity,and internal bond strength.The results indicated that different face-to-core strand ratios led to variations in BOSB morphology,internal structure,pore structure,and vertical density gradient,which directly influenced the boards'physical and mechanical properties.Notably,the BOSB with a 2∶1∶2 face-to-core strand ratio exhibited superior physical and mechanical properties due to its cross-sectional morphology with fewer internal voids,lower average porosity(21.81%)and smaller average pore diameter(21.61 nm),and uniform density distribution.Specifically,this configuration demonstrated the lowest 24-hour thickness swelling,which was 28.3%lower than the requirement of national standard GB/T 41715-2022“Oriented strand board”for OSB/4 type boards.Additionally,its static bending strength,modulus of elasticity,and internal bond strength exceeded the requirements of GB/T 41715-2022 OSB/4 type board standards by 316.2%,377.8%and 96%,respectively.The study confirmed that,with consistent raw materials in BOSB production,strategically increasing the face layer density while reducing the core layer density to enhance face-to-core structural differentiation significantly improved the mechanical properties of the board.This innovative approach to BOSB design paves the way for optimizing bamboo-based panels,offering a theoretical foundation for improving BOSB structure and performance.The findings highlight the potential for developing high-performance bamboo-based panels with superior durability and strength.
作者
李改换
张建
王新洲
王洪艳
张文福
陆铜华
王进
袁少飞
LI Gaihuan;ZHANG Jian;WANG Xinzhou;WANG Hongyan;ZHANG Wenfu;LU Tonghua;WANG Jin;YUAN Shaofei(Zhejiang Academy of Forestry,Hangzhou 310023,China;College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China;Treezo New Material Technology Group Co.Ltd.,Hangzhou 310023,China)
出处
《林业工程学报》
北大核心
2026年第2期66-75,共10页
Journal of Forestry Engineering
基金
浙江省杭州市科技发展计划项目(202204T12)
浙江省林业科技项目(2022SY01)。
关键词
表芯层刨花配比
竹定向刨花板
物理力学性能
内部结构
孔隙结构
face-to-core strand ratio
bamboo-oriented strand board
physical and mechanical property
internal structure
pore structure
