期刊
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
卷 79, 期 1, 页码 189-198出版社
SPRINGER
DOI: 10.1007/s00107-020-01616-8
关键词
Aluminum sulfate; Dimensional stability; Heat treatment; Soaking pretreatment; Thermal stability
资金
- China National Key R&D Program during the 13th Five-year Plan Period [2018YFD0600305]
- Fundamental Research Funds for the Central Universities of China [2015ZCQ-CL-01]
- Major Scientific and Technological Achievements Incubation Projects in Beijing Forestry University [2017CGP014]
- Hot Tracking Project in Beijing Forestry University [2017BLRD04]
The study found that soaking pretreatment with aluminum sulfate can effectively improve the thermal stability of wood, reduce the heat treatment temperature, and promote the formation of a carbon layer on the wood surface during heat treatment, thus improving its dimensional and thermal stability.
Acidic aluminum sulfate hydrolysis solutions can be used to catalyze the thermal degradation of wood in a mild temperature environment, and thus reduce the temperature required for heat treatment process. To improve the dimensional and thermal stability of Chinese fir during heat treatment at 120 degrees C, 140 degrees C and 160 degrees C, this study investigated the effects of soaking pretreatment with 5%, 10% and 15% aluminum sulfate on the chemical and structural changes of the heat-treated Chinese fir. The results indicated that the samples treated at 15% aluminum sulfate concentration and 160 degrees C heat treatment achieved the best dimensional and thermal stability. Chemical analyses by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) indicated that the catalysis of aluminum sulfate resulted in degradation of hemicelluloses during the heat treatment, and an increase in the soaking concentration and heat treatment temperature also affected the thermal degradation of celluloses. The scanning electron microscope (SEM) and mass changes test results proved that the hydrolyzed aluminum flocs mainly adhered to the inner wall of the wood tracheid as spherical precipitates, and when the soaking concentration reached 10% and 15%, a uniform soaking effect could be achieved. The thermogravimetric (TG) analysis revealed the soaking pretreatment effectively improved the thermal stability of the heat-treated wood by physically wrapping and promoting the formation of a carbon layer on the wood surface during heat treatment. Thus, aluminum sulfate soaking pretreatment exerted a great effect on the dimensional and thermal stability of wood, allowing heat treatment to be performed at a lower temperature.
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