氯化锌浸渍处理对樟子松热处理材尺寸稳定性和处理能耗的影响

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

【目的】本研究旨在探究弱酸性氯化锌溶液浸渍对热处理材的尺寸稳定性以及处理能耗的影响。【方法】采用质量分数5%的氯化锌溶液浸渍樟子松试样,并进行不同温度的热处理,通过试样吸湿后的尺寸和质量变化分析,评价浸渍–热处理樟子松试样的尺寸稳定性和吸湿性,并结合红外光谱分析、X射线衍射分析以及能耗计算,阐明浸渍–热处理对试样尺寸稳定性的影响机制和能量消耗情况。【结果】氯化锌浸渍–热处理组的性能提升效果比热处理组更明显;随着热处理温度的升高,木材的吸湿性降低,尺寸稳定性提高,热处理组和浸渍–热处理组的体积湿胀率分别从3.5%、3.4%下降到2.6%、2.1%;两种处理方式下的处理材红外吸收光谱图中均没有产生新的官能团特征峰,但羟基数量均随着温度升高而明显降低;处理材的相对结晶度呈上升趋势,热处理组和浸渍–热处理组分别由36.05%、38.77%提升到48.51%、53.04%;浸渍–热处理组试材在160℃达到的处理效果比仅进行180℃热处理达到的处理效果更好,同时因为前者的处理温度更低,所以能够减少处理过程中的能耗,在所研究的温度范围内最高可减少10%的能耗。【结论】相比樟子松热处理改性,氯化锌浸渍–热处理联合改性可以通过更低的热处理温度使樟子松达到相同的尺寸稳定性,有助于热处理工序的节能减排,对于力学性能方面的影响则需要进一步深入研究。

[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 impregnationheat 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.