木质素作为天然胶粘剂对无胶秸秆纤维板材性能的研究

Study on Properties of Lignin as Natural Adhesive on Non-Glue Straw Fiber Boards

传统人造板材的制备大多利用了脲醛树脂、酚醛树脂等胶黏剂,耗费石化资源且环保度不高,木质素作为植物细胞中的天然粘合剂,具有代替传统胶黏剂制备纤维人造板的优势,且人造板材的吸水性能本身具有劣势,有待提升。利用木质素作为天然粘合剂,采用热压工艺生产由麦秆制成的纤维板,研究了当木质素添加量由0%增加到12%时人造板材的膨胀吸水系数及邵氏硬度等力学性能有着明显提升。结果表明:当木质素添加量为10%时,板材的吸水厚度膨胀率(H)最低为21.0%,耐水性最优;板材的弹性模量、最大载荷、最大应力分别为37.0098N/mm^(2)、3001.80N、4.3584N /mm^(2)。

The preparation of traditional wood-based panels mostly uses adhesives such as urea-formaldehyde resins and phenolic resins,which consume petrochemical resources and is not friendly for environment.As a natural adhesive in plant cells,lignin has the potential to replace traditional adhesives to prepare fiber-based panels.Advantages,and the water absorption performance of man-made panels itself has disadvantages and needs to be improved.In this study, lignin was used as a natural binder to produce fiberboard made of wheat straw by hot pressing process.The mechanical properties are significantly improved.The results show that when the amount of lignin added is 10%,the water absorption thickness expansion ratio (H) of the board is at least 21.0%,and the water resistance is the best.The elastic modulus,maximum load,and maximum stress of the board are respectively 37.0098N/mm^(2), 3001.80N, 4.3584N/mm^(2).