Effects of zinc chloride impregnation treatment on dimensional stability and energy consumption of heat-treated Mongolian scots pine

Wang Bo; He Zhengbin; Wang Zhenyu; Yi Songlin

doi:10.12171/j.1000-1522.20230244

Journal of Beijing Forestry University > 2024 > 46(2): 123-131. > DOI: 10.12171/j.1000-1522.20230244

Wang Bo, He Zhengbin, Wang Zhenyu, Yi Songlin. Effects of zinc chloride impregnation treatment on dimensional stability and energy consumption of heat-treated Mongolian scots pine[J]. Journal of Beijing Forestry University, 2024, 46(2): 123-131. DOI: 10.12171/j.1000-1522.20230244

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Effects of zinc chloride impregnation treatment on dimensional stability and energy consumption of heat-treated Mongolian scots pine

State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory of Wood Science and Engineering, Key Laboratory of Wooden Material Science and Application of Ministry of Education, School of Material Science and Technology, Beijing Forestry University, Beijing 100083, China

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Received Date: September 20, 2023
Revised Date: December 30, 2023
Accepted Date: January 01, 2024
Available Online: January 03, 2024

Graphical Abstract

Abstract

Abstract

Objective
This study aimed to investigate the effects of impregnation with mildly acidic zinc chloride solution on the dimensional stability of heat-treated materials as well as the treatment energy consumption.
Method
Mongolian scots pine specimens were impregnated with a 5% zinc chloride solution and subjected to high-temperature heat treatment at different temperatures. Subsequently, we assessed the dimensional stability and moisture absorption of these treated Mongolian scots pine samples by examining their dimensional and mass changes after moisture absorption. To deepen our understanding, we complemented this with infrared spectroscopy, X-ray diffraction analysis, and energy consumption assessments. These analyses aimed to clarify both the mechanism and the energy requirements associated with impregnation and heat treatment concerning the specimens’ dimensional stability.
Result
The performance enhancement effect of the zinc chloride impregnation-heat treatment group was more pronounced than that of the heat treatment group. As the heat treatment temperature increased, the hygroscopicity of sample decreased, and the dimensional stability improved. The volumetric swelling ratios of the heat treatment group and the zinc chloride impregnation-heat treatment group decreased from 3.5% and 3.4% to 2.6% and 2.1%, respectively. Infrared absorption spectra of the treated materials under both methods did not exhibit new functional group characteristic peaks; however, the hydroxyl content decreased significantly with increasing temperature. The relative crystallinity of the treated material increased in both the heat treatment group and the impregnation-heat treatment group, rising from 36.05% and 38.77% to 48.51% and 53.04%, respectively. Notably, the treatment effect achieved by the zinc chloride impregnation-heat treatment group at 160 ℃ was superior to that achieved solely by 180 ℃ heat treatment. Moreover, due to the lower treatment temperature of the former, energy consumption during the process could be reduced, potentially saving up to about 10% within the studied temperature range.
Conclusion
Compared with heat treatment modification alone for Mongolian scots pine, the combined modification of zinc chloride impregnation-heat treatment can achieve the similar effect of dimensional stability improvement by adopting lower heat treatment temperatures, which contributes to energy saving and emission reduction of heat treatment process. However, further in-depth study is required to assess its impact on mechanical properties.
- Mongolian scots pine,
- wood heat treatment,
- zinc chloride impregnation,
- dimensional stability,
- difference of energy consumption

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Effects of zinc chloride impregnation treatment on dimensional stability and energy consumption of heat-treated Mongolian scots pine

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