溶胶-凝胶法改良人工林马尾松尺寸稳定性及其机理研究

doi:10.3969/j.issn.0253-2417.2024.01.010

摘要/Abstract

摘要：

马尾松是广西地区重要的人工林资源之一，但其尺寸稳定性较差，极大地限制了其在木材工业中的使用。本研究选用基于SiO₂的溶胶-凝胶法对马尾松进行改良，探讨了浸渍时间对马尾松尺寸稳定性的影响，并通过扫描电子显微镜(SEM)、X射线能谱(EDS)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)、X射线衍射(XRD)揭示了溶胶-凝胶法对马尾松的改良机理。研究结果表明：经过6 h溶胶浸渍处理的改性马尾松尺寸稳定性最好，相较于未处理的马尾松，浸渍6 h的改性马尾松的浸渍率为5%，60 h吸水质量增加率由34.7%降低至28.2%，60 h吸湿体积膨胀率由16.5%降低至11.1%，72 h抗老化性能由18.02的色差值降低为11.9。溶胶-凝胶法对马尾松尺寸稳定性的改善机理体现在两个方面：其一，通过形成玻璃层状及膨胀结构可以阻挡水分的进入；其二，通过氢键及化学键的形式与细胞壁进行结合，以起到永久的润胀作用。

关键词: 马尾松, 尺寸稳定性, 溶胶-凝胶法, SiO₂

Abstract:

Masson pine is one of the important crucial artificial forest resources in Guangxi region. But the utilization of it was significantly limited in wood industry due to its poor dimensional stability. Herein, a silica-based sol-gel method was employed to improve masson pine. The effect of impregnation time on the dimensional stability of masson pine was discussed. The improvement mechanism of the sol-gel method on masson pine was elucidated through scanning electron microscopy(SEM), energy-dispersive X-ray spectroscopy(EDS), Fourier-transform infrared spectroscopy(FT-IR), X-ray photoelectron spectroscopy(XPS), and X-ray diffraction(XRD). The results demonstrated that the size stability of the modified masson pine after 6 hours of sol-gel impregnation treatment was the best. Compared with untreated masson pine, the modified wood showed a 5% impregnation rate. The 60 h water absorption mass increase rate reduced from 34.7% to 28.2%. The 60 h hygroscopic volume expansion rate decreased from 16.5% to 11.1%. And the 72 h anti-aging performance decreased from 18.02 color difference value to 11.9. Therefore, the improvement mechanism of the sol-gel method on the dimensional stability of masson pine reflected in two main aspects. Firstly, the entry of moisture could be blocked by the formed glassy layer and expansion structure. Secondly, it bound to the cell walls in the form of hydrogen and chemical bonds to exert permanent swelling effect.

Key words: Pinus massoniana Lamb., dimensional stability, sol-gel method, silica

中图分类号:

TQ35

刘晓玲, 陈松武, 何林韩, 黄海英, 王浏浏, 罗玉芬. 溶胶-凝胶法改良人工林马尾松尺寸稳定性及其机理研究[J]. 林产化学与工业, 2024, 44(1): 74-80.

Xiaoling LIU, Songwu CHEN, Linhan HE, Haiying HUANG, Liuliu WANG, Yufen LUO. Dimensional Stability and Its Mechanism of Plantation Masson Pine Improved by Sol-gel Method[J]. Chemistry and Industry of Forest Products, 2024, 44(1): 74-80.

图/表 6

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