Cui Meng, Zheng Nihua, Wang Shixin, Luo Bin, Liu Hongguang
College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
Beijing Building Materials, Beijing Building Materials Testing Academy Co., Ltd., Beijing 100024, China.
Materials (Basel). 2022 Apr 13;15(8):2845. doi: 10.3390/ma15082845.
Magnesium oxychloride adhesive (MOA) is a kind of inorganic adhesive with a low energy consumption and environmental protection. The modified particleboard with magnesium oxychloride adhesive (MOPB) has the advantages of no volatiles and has a high mechanical strength. In this study, MOA and poplar shavings were used to prepare MOPB, fly ash (FA) was used to modify and enhance the properties of MOPB; the influence mechanism on the mechanical of MOPB was studied. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to analysis the bonding mechanism of MOA and poplar shavings, and the composite system model of MOPB was constructed. The mechanism of modified MOPB with FA (MOPB-FA) was clarified. The results show that the use of FA effectively improved the mechanical strength of MOPB, and when the ratio of FA addition was 15 wt%, MOPB-FA's modulus of rupture (MOR) value was 16.32 MPa, an increase of 24.5% more than before (13.11 MPa). The modulus of elasticity (MOE) value was 4595.51 MPa, an increase of 76.7% more than before (2600 MPa), and the thickness of swelling (TS) value was 0.35%, a decrease of 85.2% less than before (2.36%).
氯氧镁胶粘剂（MOA）是一种低能耗、环保的无机胶粘剂。用氯氧镁胶粘剂制备的改性刨花板（MOPB）具有无挥发性、机械强度高的优点。本研究采用MOA和杨木刨花制备MOPB，用粉煤灰（FA）对MOPB进行改性并增强其性能；研究了FA对MOPB力学性能的影响机制。利用傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）分析了MOA与杨木刨花的粘结机理，构建了MOPB的复合体系模型。阐明了用FA改性MOPB（MOPB-FA）的机理。结果表明，FA的使用有效提高了MOPB的力学强度，当FA添加比例为15 wt%时，MOPB-FA的抗弯强度（MOR）值为16.32 MPa，比之前（13.11 MPa）提高了24.5%。弹性模量（MOE）值为4595.51 MPa，比之前（2600 MPa）提高了76.7%，吸水厚度膨胀率（TS）值为0.35%，比之前（2.36%）降低了85.2%。
