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为研究硅溶胶浸渍处理对毛竹光老化性能的影响,探索利用硅溶胶改善竹材耐光老化性能的可行性,以毛竹为试验材料,采用傅里叶红外分析方法,对硅溶胶浸渍及光老化处理前后毛竹表面化学成分进行分析;通过色差测试,研究硅溶胶浸渍处理前后毛竹加速光老化条件下的色彩稳定性;结合扫描电镜及能谱分析,总结硅溶胶处理及光老化处理前后毛竹内部硅溶胶分布情况,并分析其对毛竹光老化性能的影响。研究结果显示:加速光老化后,毛竹在波数1 720、1 594、1 510、1 462及1 035 cm-1等处吸收峰产生变化,说明毛竹表面的半纤维素及木质素产生了光降解;而在浸渍硅溶胶后,光老化毛竹化学成分对应位置的吸收峰变化减少,说明硅溶胶对毛竹耐光老化性能有改善效果。色差分析结果同样显示,硅溶胶浸渍处理后毛竹的色差减小,耐光老化性能得到改善。扫描电镜及能谱分析结果显示:硅溶胶浸渍处理后,硅溶胶填充于毛竹细胞腔内,对毛竹内部化学物质起保护作用;而老化处理后,毛竹内部硅溶胶会产生一定程度的流失。浸渍处理后硅溶胶在毛竹内部主要以物理填充方式分布于细胞腔中,起到对其内部化学物质(纤维素、半纤维素及木质素等)的保护作用,使毛竹光老化后色差减小,耐光老化性能加强。因此,利用硅溶胶改善竹材耐光老化性能具有可行性。
In order to study the effect of silica sol impregnation on the photo-aging properties of bamboo, and to explore the feasibility of using silica sol to improve the photo-aging resistance of bamboo, the bamboo was used as the experimental material and the Fourier transform infrared spectroscopy The chemical composition of the surface of bamboo was analyzed. The color stability of the bamboo under accelerated photo-aging conditions was studied by color-difference test. The distribution of silica sol inside and outside the bamboo before and after silica sol treatment and photo-aging treatment were analyzed by SEM and EDS The situation, and analyze its impact on the photo-aging properties of bamboo. The results showed that after accelerated photo-aging, the absorption peaks of Phyllostachys pubescens at the wavenumbers of 1 720, 1 594, 1 510, 1 462 and 1 035 cm-1 changed, which indicated that the photodegradation of hemicellulose and lignin on the surface of Phyllostachys pubescana ; And after immersing silica sol, the change of the absorption peak corresponding to the chemical components of photo-aged bamboo decreased, indicating that the silica sol has the improvement effect on the light aging resistance of the bamboo. The results of color difference analysis also showed that the color difference of the bamboo after the silica sol immersion treatment is reduced, and the light aging resistance is improved. Scanning electron microscopy and energy dispersive spectroscopy analysis showed that after the silica sol immersed, silica sol filled in the cavity of the cells of bamboo to protect the internal chemical substances of the bamboo. After the aging treatment, the silica sol inside the bamboo could be lost to some extent. After immersion treatment, the silica sol mainly distributes inside the cell cavity in the inner part of the bamboo by means of physical filling, and plays a protective role on the internal chemical substances (cellulose, hemicellulose and lignin, etc.), and reduces the color difference after photo-aging of the bamboo , Light aging properties to enhance. Therefore, the use of silica sol to improve bamboo light aging performance is feasible.