毛竹重组竹产品的质量及耐腐性能研究

The Performance with Product Quality and Decay Resistance of Phyllostachys edulis Scrimber

以本色与炭化色重组竹为研究对象,按GB/T 30364—2013和GB/T 13942.1—2009检测了厚度、2 h水煮后弹性模量、2 h水煮后静曲强度、24 h吸水厚度膨胀率、内结合强度、甲醛释放量等指标。结果表明:相比本色重组竹,炭化色重组竹由于高温处理竹束导致竹纤维中的纤维素、半纤维素发生化学反应,2 h水煮后弹性模量和静曲强度以及24 h吸水厚度膨胀率分别降低了13%、12%、53%,而内结合强度增加了13%,甲醛释放量则均为E0级;毛竹达到Ⅱ级耐腐水平,本色重组竹的失重率略大于炭化色重组竹,二者耐腐等级均达到Ⅰ级强耐腐水平;密粘褶菌菌丝进入毛竹导管,并通过导管壁上的纹孔进入薄壁细胞,分泌的纤维素酶导致细胞结构被破坏;重组竹在制备过程中损失了大量的淀粉和糖类等营养物质,且酚醛树脂胶黏剂对密粘褶菌具有一定的抑制效果,内部几乎没有菌丝渗透,其天然耐褐腐能力强。

Bamboo scrimber with natural color and dark color as the research object.According to the standard GB/T 30364—2013 and GB/T 13942.1—2009 tested the thickness,MOE after 2 h boiled,MOR after 2 h boiled,24 h thickness swell,internal bond strength,formaldehyde releases.The mechanical properties test showed that the high temperature treated bamboo fiber of dark color bamboo scrimber caused chemical reaction between cellulose and hemicellulose in bamboo fiber compared with the natural color bamboo scrimber.The MOE after 2 h boiled,MOR after 2 h boiled,24 h thickness swell decreased by 13%,12%and 53%respectively.The internal bond strength increased by 13%.Formaldehyde releases is E0 level;The decay resistance grades of Phyllostachys edulis reached the level II,and the weight loss rate of the natural color bamboo scrimber was slightly larger than that of the dark color bamboo scrimber,and the decay resistance grades of both reached the level I;The hyphae of the Gloeophyllum trabeum enters the P.edulis vessel and enters the parenchyma cells through the pits in the vessel,and the secreted cellulase causes cell structure to be destroyed;In the process of preparation,the bamboo scrimber loses a lot of nutrients such as starch and sugar,and the phenolic resin adhesive has a certain inhibitory effect on the G.trabeum.There is almost no hyphae infiltration inside,and its decay resistance is strong.