摘要
在竹材工业化利用中,多将竹材分解为小单元竹篾或将竹材展平后进行加工,同时对竹材复合材料的实验室研究多以竹纤维和小尺寸竹片为主,直接利用圆竹本身结构特性制备管材的应用案例较少。以圆竹为对象,制备圆竹酚醛树脂复合管材,充分利用其中空的结构特性,以期为“以竹代木”“以竹代塑”提供一种新的途径。首先通过对圆竹进行脱木素提高其渗透性;随后真空浸渍酚醛树脂,并在自制模具中进行环形加压固化,验证了圆竹酚醛树脂浸渍复合工艺方法的可行性;同时研究了不同压力条件下成型的圆竹酚醛树脂复合管材的尺寸稳定性、润湿性以及微观结构变化。通过压缩率测试、剖面密度测试以及电镜观察发现,圆竹酚醛树脂复合管材径向上存在差异,两端面压缩密实化程度较高,中心层则较低。内外端面的竹材细胞细胞壁塌陷,与酚醛树脂形成致密结构,中心层的竹材细胞微观结构变化较小。经过处理的圆竹在环形加压固化成型后具有较高的压缩率和较低的径向吸湿回复率,圆竹酚醛树脂复合管材的尺寸稳定性相比于未处理圆竹有较大提升,同时,复合管材的吸水性能、润湿性能都较未处理圆竹明显下降。
Bamboo is a special renewable forest resource,characterized by fast growth,short growth cycle,and long service life.China is the country with the richest and most widely distributed bamboo species in the world.Currently,China's bamboo industry has evolved into a flourishing,eco-friendly industry that integrates science and technology,ecological considerations,cultural aspects,and economic benefits.It stands as a global leader in terms of the size of bamboo forests,bamboo production,bamboo forest cultivation,and the application technology of bamboo materials and the application technology of bamboo materials.China's bamboo industry research field is in-depth and extensive,and the main research direction including bamboo machinery,bamboo-based panels,bamboo-based composite mate-rials,and bamboo high value-added utilization of technology.In the industrial use of bamboo,it is mostly decomposed into small units of gabions or flattened for processing,while the laboratory research on bamboo composites is dominated by bamboo fibers and small-sized bamboo slices,and there are limited application cases where the structural pro-perties of round bamboo are directly used for the preparation of pipes.Taking round bamboo pipes as the object,the preparation of round bamboo phenolic resin composite pipe makes full use of its hollow structural properties,in order to provide a new way for “replacing wood with bamboo” and “replacing plastic with bamboo”.Firstly,the permeability of round bamboo was improved by delignification.Subsequently,the vacuum impregnation of phenolic resin was carried out,and the feasibility of the resin impregnation composite process of round bamboo was verified by circular pressure curing in homemade molds.At the same time,the dimensional stability,wettability,and microstructural changes of round bamboo phenolic composite pipes molded under different pressure conditions were also investigated.The compression rate test,profile density test and electron microscope observation revealed that the round bamboo composite pipes differed radially,with higher compression densification on the two end surfaces and lower in the center layer.The cell walls of the round bamboo cells in the inner and outer end faces collapsed and formed a dense structure with phenolic resin,while the microstructure of the round bamboo cells in the center layer changed slightly.The treated round bamboo pipes had higher compression rate and lower radial hygroscopic recovery rate after curing and molding under circular pressure,and the dimensional stability of the round bamboo composite pipe was greatly improved compared with that of the untreated round bamboo,while the water absorption and wettability properties of the composite pipe decreased significantly compared with that of the untreated round bamboo.
作者
周英豪
陈海丽
侯俊峰
俞友明
ZHOU Yinghao;CHEN Haili;HOU Junfeng;YU Youming(School of Chemistry and Materials Engineering,Zhejiang A&F University,Hangzhou 311300,China)
出处
《林业工程学报》
CSCD
北大核心
2024年第1期67-74,共8页
Journal of Forestry Engineering
基金
浙江省自然科学基金(LY17C160007)。
