A kind of preparation method of artificially degrading water-saturated wood

Abstract

The invention discloses a method for efficiently preparing artificially degraded water-saturated wood, and relates to the research field of water-saturated wood cultural relics protection. The wood sample block is immersed in the prepared NaOH solution and then vacuumized, so that the NaOH solution is immersed inside the wood sample block under negative pressure, until the wood sample block is saturated with water and no longer floats; The impregnated wood sample block is moved into a hydrothermal device, and hydrothermally treated under high temperature and high pressure; the wood sample block after the hydrothermal treatment is continuously washed with clean water, and the water is changed several times until the NaOH solution is completely removed, thereby preparing artificial degradation. Water-saturated wood. The invention improves the penetration depth and uniformity of alkali solution, increases the maximum moisture content of wood, improves preparation efficiency, and reduces alkali consumption and production cost through the combined use of low-concentration NaOH solution vacuum pre-impregnation and high-pressure hydrothermal treatment.

Description

technical field [0001] The invention relates to the research field of protection of water-saturated wood cultural relics, in particular to a preparation method of artificially degraded water-saturated wood. Background technique [0002] With the vigorous development of archaeology in my country, the number of unearthed / watered wooden cultural relics has increased rapidly, and the scientific research, protection and restoration of water-saturated wooden cultural relics has received more and more attention. The preservation status evaluation and protection effect evaluation of water-saturated wooden cultural relics require a certain number and specified volume of wood samples, and it is inevitable to sample the cultural relics. However, cultural relics are limited resources of cultural relics. Special wooden cultural relics, such as wooden shipwreck hulls, have important research value in themselves. Mass sampling of them is a destructive process and should be avoided. Water-...

AI Technical Summary

Problems solved by technology

Under normal temperature and pressure, modern healthy wood samples were immersed in 50% NaOH solution for a long time, and the immersion time was sometimes as long as more than 50 days, but the degradation degree of the obtained wood was not high, and it was reported that the loss of wood quality reached 30% (Broda M, Mihaela-Popescu C. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019, 209: 280-287.), the maximum water content is only 177% (Kennedy A, Pennington E R. Studies in conservation, 2014, 59 (3 ):194-201.)

The concentrated alkali impregnation method requires high alkali concentration, long treatment time, low efficiency, and low moisture content of the sample, which is far from the moisture content of archaeological saturated wood of 300% or even more than 500%.

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