A reinforcement method for water-saturated wooden cultural relics and its application

Abstract

The present invention belongs to the technical field of cultural relics protection, and specifically relates to a reinforcement method for water-saturated wooden cultural relics and its application. The reinforcement method for water-saturated wooden cultural relics of the present invention comprises the following steps: S1, soaking the water-saturated wooden cultural relics in a polyethylene glycol monostearate solution for reinforcement treatment; S2, drying the water-saturated wooden cultural relics after reinforcement treatment. Compared with polyethylene glycol (PEG), the moisture absorption rate of polyethylene glycol monostearate is significantly reduced; as a reinforcement agent for water-saturated wooden cultural relics, it can effectively reduce the shrinkage rate of wood after drying, and the degree of damage to water-saturated wooden cultural relics is greatly reduced; at the same time, it reduces the requirements for the exhibition display and storage environment of the treated wooden cultural relics; it is beneficial to extend the life of the cultural relics. Moreover, the reinforcement method of the present invention has a simple process and low site requirements, which is of great significance to the protection of water-saturated wooden cultural relics.

Description

Technical Field

[0001] The invention belongs to the technical field of material protection, and particularly relates to a reinforcement method for water-saturated wooden cultural relics and application thereof. Background Art

[0002] Wood is one of the earliest and most important materials used by humans. Numerous representative wooden artifacts used by humans in ancient times have been unearthed at various sites in Zhejiang Province alone, including canoes and wooden paddles from the Kuahuqiao site in Xiaoshan, and axe handles, wooden swords, and butterfly-shaped objects from the Hemudu site in Yuyao.

[0003] In addition to preserved wooden artifacts in the form of ancient buildings, Buddhist statues, and wooden crafts, another type of wooden artifact is unearthed. Long-term burial in these unearthed wooden artifacts degrades the cellulose and hemicellulose components within the wood, resulting in a loose structure, reduced strength, and increased moisture content. This results in water-saturated wooden artifacts, which can only maintain their original shape thanks to the support of water. However, if no protective measures are taken after unearthing these water-saturated wooden artifacts, they will experience irreversible shrinkage and deformation, depriving them of their true cultural value.

[0004] Therefore, the restoration and protection of water-saturated wooden artifacts requires dehydration measures, and the following two requirements must be met: 1. Remove the bulk of the water in the water-saturated wooden artifact, reducing the moisture content to a harmless range. The most important requirement in this process is to maintain the size and shape of the artifact. 2. When the degree of decay of the water-saturated wooden artifact is high and the strength of the artifact is reduced, it needs to be reinforced while dehydrating to improve its strength. Currently, the main dehydration and shaping methods for water-saturated wooden artifacts include: natural drying, solvent replacement, vacuum freeze drying, compound filling, monomer impregnation polymerization, etc. It is of great research significance to determine which reinforcement agents and methods can be used to stabilize water-saturated wooden artifacts and better preserve their original appearance. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a method for reinforcing water-saturated wooden cultural relics, whereby the treated wood is closer to its original state and has a low shrinkage rate.

[0006] The present invention also proposes the application of the above-mentioned reinforcement method of water-saturated wooden cultural relics in the restoration and protection of cultural relics.

[0007] Polyethylene glycol (PEG) is a polymer with high water solubility, low vapor pressure, non-toxicity, and excellent stability. Furthermore, its hydroxyl groups can form hydrogen bonds with decaying wood tissue, providing support and stability, allowing water-saturated wooden artifacts to be treated and retain their original appearance. Therefore, it has been studied by researchers both domestically and internationally for decades, becoming a relatively mature and widely used treatment method for water-saturated wooden artifacts. PEG with a molecular weight below 1000 is in a liquid state and cannot be used for dehydration and setting. PEG with a molecular weight around 1000 forms a waxy solid, and the dehydration and setting effect is less than ideal. PEG with a molecular weight above 5000 suffers from poor water solubility and is therefore difficult to meet application requirements. Currently, PEG with a molecular weight of approximately 2000 to 4000 is the most commonly used for dehydration and setting of water-saturated wooden artifacts. Researchers have also discovered that PEG molecules in this molecular weight range still have some drawbacks during treatment, such as long treatment times, darkening of the treated artifacts, strong hygroscopicity, and limited molecular permeability.

[0008] The existing PEG method has certain limitations, including long processing time, blackening of the artifacts after treatment, and strong hygroscopicity. The processing cycle for cultural relics protection is relatively long, and the processing environment is generally relatively simple, and may even be carried out at archaeological sites or in the open air. In addition, some cultural relics are large in size, and there may be a lack of effective control of the environment's constant temperature and humidity when they are displayed, exhibited, or preserved. When the filler is highly hygroscopic, it will absorb moisture as the ambient humidity increases under the above-mentioned environment, and will dry out again when the ambient humidity decreases. Repeated occurrence of such situations may cause the precipitation of filler, affecting the color and state of the artifact surface, and even causing uneven filling of filler in wooden artifacts, resulting in cracking, deformation, and other consequences that affect the life of the artifact. Therefore, it is believed that the most serious disadvantage of the PEG method is the influence of hygroscopicity. This shows that improving the hygroscopicity of PEG is of great significance and urgent importance for the application and promotion of the PEG method in the protection of water-saturated wooden artifacts.

[0009] PEG's hygroscopicity is primarily due to its molecular structure. Therefore, to reduce its hygroscopicity, it is necessary to adjust the molecular structure of PEG. Since the main groups in the PEG molecule are the ethoxy group (-CH2-CH2-O-) and the terminal hydroxyl group (-OH), both of which can form hydrogen bonds with water molecules and hydroxyl groups, it is relatively water-soluble and highly hygroscopic. To reduce the hygroscopicity of PEG molecules, it is necessary to introduce hydrophobic molecular groups into the molecular structure. First, the molecular weight of PEG molecules ranges from several hundred to several thousand. If the proportion of introduced hydrophobic groups is relatively small, the overall chemical properties will be less affected. Secondly, from the perspective of the entire molecular structure, the only groups on the PEG molecule that can undergo modification reactions are the hydroxyl groups at the ends of the molecular chain, leaving relatively few molecular reaction points. Therefore, these two points are the main reasons why PEG molecule modification is relatively difficult.

[0010] To this end, the technical solutions of the present invention are as follows:

[0011] A first aspect of the present invention provides a method for reinforcing water-saturated wooden cultural relics, comprising the following steps:

[0012] S1, soaking the water-saturated wooden artifacts in polyethylene glycol monostearate solution for reinforcement;

[0013] S2, drying the water-saturated wooden cultural relics after reinforcement treatment.

[0014] In the present invention, compared with polyethylene glycol, polyethylene glycol monostearate (POES, CAS: 9004-99-3) obtained by modifying stearic acid has a certain hydrophobicity at one end due to the long carbon chain in stearic acid, while the other end retains a hydroxyl group, and its hygroscopicity is significantly reduced while having a certain water solubility, and it can efficiently penetrate into the interior of water-saturated wood; when used as a reinforcing agent, it can effectively reduce the shrinkage rate of water-saturated wood after drying, and the wood is close to its original state; it can also reduce the environmental temperature and humidity requirements for the display, exhibition and preservation of cultural relics after protection treatment, thereby extending the life of the cultural relics.

[0015] In some embodiments of the present invention, step S1, the saturated wood is soaked in a polyethylene glycol monostearate solution with a gradient concentration from low to high, the mass concentration gradient is 3 to 6%, and the maximum mass concentration is 30%; the preferred mass concentration gradient is 4 to 5%, and the maximum mass concentration is 20%. The mass concentration of the polyethylene glycol monostearate solution here is the percentage of the mass of polyethylene glycol monostearate to the mass of the solvent. High-concentration reinforcing agent solutions have high viscosity and poor fluidity, and are prone to the defects that the reinforcing agent can only be coated on the surface of the wood and is difficult to penetrate into the interior of the wood, and the wood is prone to deformation and cracking after dehydration. In the present invention, the use of a polyethylene glycol monostearate solution with a gradient concentration from low to high for impregnation can promote the reinforcing agent to evenly penetrate into the interior of the wood structure, and can provide good protection for both the interior and surface of the saturated wood. After drying, the wood structure is intact and the dimensional shrinkage rate is low.

[0016] In some embodiments of the present invention, the water content of the water-saturated wooden cultural relic is 200-1000%, preferably 400-900%.

[0017] In some embodiments of the present invention, the water-saturated wooden cultural relics include at least one of Ulmaceae rough-leaved wood, Lauraceae camphor wood, and Pinus sclerotium, including but not limited to Ulmaceae rough-leaved wood with a water content of 901%, Lauraceae camphor wood with a water content of 761%, and Pinus sclerotium with a water content of 436%.

[0018] In some embodiments of the present invention, in step S1, after the concentration of polyethylene glycol monostearate inside the water-saturated wooden cultural relic reaches equilibrium with the concentration of the polyethylene glycol monostearate solution outside the water-saturated wood, the solution is replaced with a solution of the next higher concentration gradient, and the immersion is repeated. In the present invention, the criterion for determining equilibrium between the concentration of polyethylene glycol monostearate inside the water-saturated wooden cultural relic and the concentration of the polyethylene glycol monostearate solution outside the water-saturated wooden cultural relic is that the weight gain of the water-saturated wooden cultural relic is less than 3% for every 5 days of immersion.

[0019] In some embodiments of the present invention, the initial concentration (first gradient concentration) of the polyethylene glycol monostearate solution is 3-7%, preferably 3-5%, and more preferably about 5%; the solvent of the polyethylene glycol monostearate solution includes at least one of water and ethanol.

[0020] In some embodiments of the present invention, the average molecular weight of the polyethylene glycol monostearate is 500-6000, preferably 500-5000, more preferably 700-4700, including but not limited to 724, 1384, 2044, 2084, 2073, 4684, etc. A polymer with too low a molecular weight will not be effective in reinforcing water-saturated wooden artifacts, and the wood structure will be easily destroyed during drying. A polymer with too high a molecular weight and high viscosity will have difficulty penetrating into the wood, resulting in poor reinforcement of the wood's internal structure, essentially no filling effect, and prone to cracking and deformation after drying.

[0021] In some embodiments of the present invention, the moisture absorption rate of the polyethylene glycol monostearate at a temperature of 35° C. and a humidity of 80% on the 21st day is ≤12%, preferably ≤10%, and more preferably 1-10%.

[0022] In some embodiments of the present invention, the soaking temperature in step S1 is 20-60°C, such as room temperature or 50°C. The appropriate temperature can be selected based on actual conditions. For example, polyethylene glycol monostearate (average molecular weight ≥4684) with a high molecular weight forms a transparent jelly at room temperature at a high concentration (≥15%). The soaking solution can be placed in a water bath at 50°C for soaking. Heating can promote the penetration of polyethylene glycol monostearate.

[0023] In some embodiments of the present invention, the drying in step S2 is carried out by freeze drying, air drying, or low-temperature air drying, preferably freeze drying. The water-saturated wood after the reinforcement treatment in step S1 is placed below 0°C and frozen, and the frozen wood is freeze-dried; the freeze drying temperature is -70 to -30°C, preferably -70 to -50°C; the freeze drying pressure is 50 to 100 Pa, preferably about 100 Pa; and the freeze drying time is 20 to 30 hours, preferably 20 to 25 hours, and more preferably about 24 hours. The present invention uses POES soaking combined with freeze drying to effectively reduce damage to water-saturated wooden cultural relics during the drying process, further protecting the wooden structure of the water-saturated wooden cultural relics from damage.

[0024] In some embodiments of the present invention, the length, width and height of the water-saturated wooden cultural relic are respectively 2 to 5 cm, preferably 2 to 4 cm, and more preferably about 3 cm.

[0025] The second aspect of the present invention proposes the application of the water-saturated wooden cultural relic reinforcement method in the protection and / or restoration of wood, preferably in the protection and / or restoration of wooden cultural relics.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] Compared to polyethylene glycol (PEG), polyethylene glycol monostearate has a significantly lower moisture absorption rate. As a reinforcement agent for water-saturated wooden artifacts, it can effectively reduce the shrinkage of wood after drying, significantly alleviating damage to the artifacts. It can also lower the temperature and humidity requirements for display, exhibition, and preservation of the reinforced wooden artifacts, thereby effectively extending the wood's lifespan. Furthermore, the reinforcement method of the present invention is simple and requires minimal space, making it of great significance for the preservation of water-saturated wooden artifacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an optical microscope picture of the wood after treatment in Comparative Example 1;

[0029] Figure 2 This is an optical microscope picture of the wood after treatment in Comparative Example 3;

[0030] Figure 3 This is an optical microscope image of the wood after treatment in Example 3;

[0031] Figure 4 This is an optical microscope picture of the wood after treatment in Comparative Example 2;

[0032] Figure 5 This is an optical microscope image of the wood after treatment in Example 3;

[0033] Figure 6 The following are pictures of wood before and after treatment in Comparative Example 1;

[0034] Figure 7 The following are pictures of wood before and after treatment in Comparative Example 3;

[0035] Figure 8 These are pictures of wood before and after treatment in Example 3;

[0036] Figure 9 The following are pictures of wood before and after treatment in Comparative Example 2;

[0037] Figure 10 These are pictures of wood before and after treatment in Example 4. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments to fully understand the purpose, features and effects of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0039] Unless otherwise specified, the raw materials used in the following examples can be obtained from conventional commercial sources; the processes used, unless otherwise specified, are conventional processes in the art; and the operating temperatures used, unless otherwise specified, are room temperature (20±5°C).

[0040] Example 1

[0041] This example tests polyethylene glycol (PEG, HO(CH2CH2O) with different molecular weights n H, CAS: 25322-68-3) and polyethylene glycol monostearate (POES, HO(CH2CH2O) of different molecular weights) n OCC 17 H 35 , n = 10, 25, 40, 45, 55, 100, CAS: 9004-99-3), the specific process is:

[0042] Take 20g of each sample and dry it in a 45°C oven for 24 hours before weighing. Place the samples in a constant temperature and humidity chamber set at 35°C and 80% humidity. Remove and weigh them every three days until 21 days have passed. Calculate the moisture absorption rate of the samples (see the formula below).

[0043]

[0044] Where, w%: moisture absorption rate of the sample; m0: initial weight of the sample; m t : The weight of the sample after moisture absorption.

[0045] Table 1 Moisture absorption rate and material state of each sample at 35℃ and 80% humidity on the 21st day

[0046]

[0047]

[0048] Compared to PEG, POES is grafted with hydrophobic monostearic acid at one end and retains a hydroxyl group at the other. This gives POES good water solubility while significantly reducing moisture absorption. At 35°C and 80% humidity, moisture absorption is ≤10% after 21 days. Wood artifacts treated with the low-hygroscopic POES have lower requirements for humidity and other environmental conditions for subsequent display, exhibition, and preservation. They avoid darkening or moisture resorption, maintaining stable color, dimensions, and other properties over time.

[0049] Example 2

[0050] This example uses POES25 to reinforce water-saturated wooden cultural relics. The specific process is as follows:

[0051] Take 25g of POES25 and dissolve it in 500g of pure water to obtain a 5% POES25 aqueous solution (the mass of POES25 is 5% of the mass of deionized water). Take an ancient archaeological excavated water-saturated wood sample (wooden artifacts unearthed from the Maoshan site, camphor wood of the Lauraceae family, with a water content of 761%) with a length, width and height of about 3cm×3cm×3cm, wipe off the surface moisture, weigh and record its weight, and then soak it in a 5% POES25 aqueous solution. Take the wood sample out and weigh it every 5 days. When the weight growth rate is less than 3%, it is considered that the concentration of POES40 inside the sample has reached equilibrium with the solution. POES25 aqueous solutions are prepared in a gradient of 5%, with a maximum concentration of 20%, and the above operation is repeated. Then take out the wood sample, wipe off the surface solution, and freeze it in a temperature environment below 0°C until the sample is frozen. Then place it in a freeze dryer, set the temperature and pressure to -50°C and 100Pa, and the freeze drying time is about 24 hours. The shrinkage rates of the treated samples in the longitudinal, radial and tangential directions are: 0, 0.42% and 0.78%.

[0052] Example 3

[0053] This example uses POES40 to reinforce water-saturated wooden cultural relics. The specific process is as follows:

[0054] Dissolve 25g of POES40 in 500g of pure water to create a 5% POES40 aqueous solution (the mass of POES40 is 5% of the mass of deionized water). Take a water-saturated wood sample from an ancient archaeological site (a wooden artifact unearthed from the Hemudu site, Pinus serrata, with a water content of 436%), approximately 3cm x 3cm x 3cm in length, width, and height. Wipe off the surface moisture, weigh it, and record its weight. Then, soak it in a 5% POES40 aqueous solution. Remove the wood sample and weigh it every five days. When the weight increase rate falls below 3%, the POES40 concentration inside the sample is considered to have reached equilibrium with the solution. Repeat this process with a 5% gradient of POES40 aqueous solution, reaching a maximum concentration of 20%. Then remove the wood sample, wipe off the surface solution, and freeze it at a temperature below 0°C until it freezes. Place it in a freeze dryer set to -50°C and 100 Pa for approximately 24 hours. The shrinkage rates of the treated samples in the longitudinal, radial and tangential directions are 0.36%, 0.17% and 0.84%.

[0055] Example 4

[0056] This example uses POES55 to reinforce water-saturated wooden cultural relics. The specific process is as follows:

[0057] Take 25g of POES55 and dissolve it in 500g of pure water to prepare a 5% POES55 aqueous solution (the mass of POES55 is 5% of the mass of deionized water). Take an ancient archaeological excavated water-saturated wood sample (wooden artifacts unearthed from the Maoshan site, Lauraceae camphor wood, with a water content of 761%) with a length, width and height of approximately 3cm×3cm×3cm, wipe off the surface moisture, weigh and record its weight, and then soak it in a 5% POES55 aqueous solution. Take the wood sample out and weigh it every 5 days. When the weight growth rate is less than 3%, it is considered that the concentration of POES55 inside the sample has reached equilibrium with the solution. Prepare POES55 aqueous solutions in a gradient of 5% to a maximum concentration of 20%, and repeat the above steps. Then take out the wood sample, wipe off the surface solution, and freeze it in a temperature environment below 0°C until the sample is frozen. Then place it in a freeze dryer with the temperature and pressure set to -50°C and 100Pa. The freeze drying time is about 24 hours. The shrinkage rates of the treated samples in the longitudinal, radial and tangential directions are 0.12%, 1.09% and 0.44% respectively.

[0058] Example 5

[0059] This example uses POES100 to reinforce water-saturated wooden cultural relics. The specific process is as follows:

[0060] Take 25g of POES100 and dissolve it in 500g of pure water to prepare a 5% POES100 aqueous solution (the mass of POES100 is 5% of the mass of deionized water). Take an ancient archaeological excavated water-saturated wood sample (wooden artifacts unearthed from the Maoshan Ruins, Lauraceae camphor wood, with a water content of 761%) with a length, width and height of approximately 3cm×3cm×3cm, wipe off the surface moisture, weigh and record its weight, and then soak it in a 5% POES100 aqueous solution. Take the wood sample out and weigh it every 5 days. When the weight growth rate is less than 3%, it is considered that the concentration of POES100 inside the sample and the solution have reached equilibrium. Prepare the POES100 aqueous solution in a gradient of 5%, with a maximum concentration of 20%, and repeat the above operation. When the weight ratio of POES100 in water at room temperature exceeds 15%, the solution forms a transparent jelly-like state. The above soaking solution needs to be placed in a 50℃ water bath to complete the process. Then take out the wood sample, wipe off the surface solution, and freeze it in a temperature environment below 0℃ until the sample is frozen. The samples were then placed in a freeze dryer at a temperature of -50°C and a pressure of 100 Pa for approximately 24 hours. The shrinkage rates in the longitudinal, radial, and tangential directions of the treated samples were -0.21%, 0.62%, and 0.37%, respectively.

[0061] Comparative Example 1

[0062] This comparative example does not perform impregnation and filling on water-saturated wooden cultural relics, but directly freeze-dries them. The specific process is as follows:

[0063] After wiping off the surface moisture of a water-saturated wooden artifact sample (a wooden artifact unearthed from the Hemudu site, made of pine pine with a moisture content of 436%), the sample was placed in a freezer at a temperature below 0°C until it froze. The sample was then placed in a freeze dryer at a temperature and pressure of -50°C and 100 Pa, and freeze-dried for approximately 24 hours. The shrinkage rates of the treated sample in the longitudinal, radial, and tangential directions were 7.42%, 9.60%, and 6.74%, respectively.

[0064] Comparative Example 2

[0065] This comparative example does not perform impregnation and filling on water-saturated wooden cultural relics, but directly freeze-dries them. The specific process is as follows:

[0066] After wiping off the surface moisture of a sample of water-saturated wooden artifacts (wooden artifacts unearthed from the Maoshan site, camphor wood of the Lauraceae family, with a moisture content of 761%), it was placed in a freezing environment at a temperature below 0°C until the sample was frozen. It was placed in a freezing environment at a temperature below 0°C until the sample was frozen. It was then placed in a freeze dryer, with the temperature and pressure set at -50°C and 100 Pa. The freeze drying time was approximately 24 hours. The shrinkage rates of the treated samples in the longitudinal, radial and tangential directions were: 3.98%, 4.55% and 8.91%.

[0067] Comparative Example 3

[0068] This comparative example uses PEG2000 to reinforce water-saturated wooden cultural relics. The specific process is as follows:

[0069] Dissolve 25g of PEG2000 in 500g of pure water to prepare a 5% PEG2000 aqueous solution (the mass of PEG2000 is 5% of the mass of deionized water). Take a water-saturated wood sample (approximately 3cm x 3cm x 3cm in length, width, and height) from an ancient archaeological site (a pine pine with a water content of 436%), wipe off the surface moisture, weigh it, and record its weight. Then, soak it in the 5% PEG2000 aqueous solution. Remove the wood sample every five days and weigh it. When the weight gain falls below 3%, the PEG2000 concentration within the sample is considered to have reached equilibrium with the solution. Repeat this process by adding 5% PEG2000 aqueous solutions, reaching a maximum concentration of 20%. Remove the wood sample, wipe off the surface solution, and freeze it below 0°C until it freezes. Place it in a freeze dryer at -50°C and 100 Pa for approximately 24 hours. The shrinkage rates of the treated samples in the longitudinal, radial and tangential directions are 5.6%, 4.1% and 4.7%.

[0070] Test example

[0071] This test example tests the dimensional changes (longitudinal, radial and tangential shrinkage) of the water-saturated wooden cultural relics before and after treatment in the embodiment and the comparative example. The test results are shown in Table 2.

[0072] Table 2 Morphological changes of water-saturated wooden relics after treatment in Examples and Comparative Examples

[0073]

[0074]

[0075] As shown in Table 2, the water-saturated wooden artifacts in Comparative Examples 1 and 2, when directly freeze-dried without any filler, failed to maintain their unearthed form, resulting in significant shrinkage and deformation. Compared to PEG2000 (Comparative Example 3), POES exhibits lower hygroscopicity under high-temperature and high-humidity conditions (35°C, 80% humidity). The wooden artifacts in Examples 2-5, treated with a combination of POES soaking and freeze-drying, all exhibited lower shrinkage than those treated with PEG2000 soaking and freeze-drying, resulting in artifacts closer to their unearthed state.

[0076] Table 3 Mechanical changes of water-saturated wooden relics after treatment in Examples and Comparative Examples

[0077]

[0078] Figures 1 to 3 These are optical microscope images of the wood after treatment in Comparative Example 1, Comparative Example 3, and Example 3, respectively. Figures 6-8 The following are pictures of the wood before and after treatment with Comparative Example 1, Comparative Example 3, and Example 3, respectively. Combined with Table 2, it can be seen that compared with direct freeze-drying, POSE and PEG2000 impregnation-freeze-drying can well preserve the original wood structure of wooden cultural relics, and the mechanical properties of the wood after POSE treatment are also improved, with better compressive resistance. Figures 4-5 These are optical microscope pictures of wood before and after treatment in Comparative Example 2 and Example 4, Figures 9-10 The following are pictures of the wood before and after treatment of Comparative Example 2 and Example 4. Compared with Comparative Example 3, the wood structure of Example 4 is more complete.

[0079] While the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A method for reinforcing water-saturated wooden cultural relics, characterized in that: The steps include: S1, soaking the water-saturated wooden cultural relic in a polyethylene glycol monostearate solution for reinforcement treatment; soaking the water-saturated wooden cultural relic in a polyethylene glycol monostearate solution with a gradient concentration from low to high, the mass concentration gradient is 4-5%, and the highest mass concentration is 20%; the temperature during the soaking process is 20-60°C; the initial concentration of the polyethylene glycol monostearate solution is 3-7%; the average molecular weight of the polyethylene glycol monostearate is 700-4700; S2, drying the water-saturated wooden cultural relics after reinforcement treatment; using freeze drying method, the freeze drying temperature is -70 to -30 ° C, and the freeze drying pressure is 50 to 100 Pa.

2. The method according to claim 1, characterized in that The polyethylene glycol monostearate has a moisture absorption rate of ≤12% on the 21st day under the conditions of a temperature of 35° C. and a humidity of 80%.

3. Use of the reinforcement method for water-saturated wooden cultural relics according to claim 1 or 2 in wood protection and / or restoration.

Images