Wang Jianing, Feng Ziyue, Zuo Jiachen, Fan Qinzhen, Zhang Libo
Guangdong Provincial Engineering & Technology Center for Corrosion and Safety in Petrochemical Industry, School of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China.
State Key Laboratory of Heavy Oil Processing, College of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China.
Materials (Basel). 2024 Nov 28;17(23):5845. doi: 10.3390/ma17235845.
The development of wheat straw boards utilizing intrinsic bonding mechanisms not only facilitates the high-value utilization of agricultural solid waste but also diminishes the reliance on synthetic adhesives. In this study, using wheat straw as the primary substrate, we investigated the effects of mechanical smashing combined with pretreatment using inorganic acids or alkalis on the properties of hot-pressed boards, as well as the relationship between the properties of hot-pressed boards and the physical properties and chemical composition of wheat straw raw materials. These selective pretreatments effectively degraded lignin, hemicellulose, and other components, thereby promoting fiber reorientation and resulting in a denser microstructure with improved self-bonding capabilities. The optimal board was fabricated with a granularity of 0.3 mm and underwent alkali pretreatment, achieving a tensile strength of 11.564 MPa, an internal bonding strength of 0.556 MPa, and bending strength and modulus of 24.306 MPa and 2.766 GPa, respectively. These findings have significant implications for advancing manufacturing processes and conceptualizing binder-free boards derived from agricultural residues.
利用内在粘结机制开发麦秸板，不仅有利于农业固体废物的高值化利用，还能减少对合成胶粘剂的依赖。在本研究中，以麦秸为主要基材，研究了机械粉碎结合无机酸或碱预处理对热压板材性能的影响，以及热压板材性能与麦秸原料物理性能和化学成分之间的关系。这些选择性预处理有效地降解了木质素、半纤维素和其他成分，从而促进了纤维重新定向，形成了具有更高自粘结能力的更致密微观结构。最佳板材的粒度为0.3毫米，并经过碱预处理，其拉伸强度为11.564兆帕，内结合强度为0.556兆帕，弯曲强度和模量分别为24.306兆帕和2.766吉帕。这些发现对于推进制造工艺以及构思源自农业残留物的无粘结剂板材具有重要意义。
