Study on Mechanism of Dehydration and Reinforcement of Waterlogged Beech by Glyoxal Method and Effect of Temperature on Properties
The glyoxal method is the most widely used method for the protection of dehydrated and reinforced wooden cultural relics in China. In this paper, Fourier infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to study the experimental process of dehydration and reinforcement of saturated beech wood by glyoxal method. The dehydration filling mechanism and the influence of temperature on the properties of dehydration and reinforcement of saturated beech wood were analyzed. The results showed that the glyoxal entered the interior of the water saturated beech, and then the glyoxal polymer formed by cross-linking polymerization directly acted on the interior of the cell, combined with the cell wall, and supported the cell to strengthen the cell wall.The weight gain rate of the sample increased, the shrinkage rate decreased, and the color difference increased significantly. The temperature rise of glyoxal treatment (40 ℃ vs. 20 ℃) could increase the diffusion and immersion amount of glyoxal in the beech sample, increase the content of glyoxal polymer in the beech sample, increase the weight gain rate and bending strength of the sample, reduce the shrinkage rate, which was conducive to the recovery and maintenance of the wood cell shape, shorten the time of dehydration and reinforcement process, and had less impact on the effect of the surfactant.
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