Wet material protection method
By attaching chitosan-copper complex and acrylamide-modified anti-mold agent to the end of the wet material, the problems of high cost, poor effect and insufficient anti-loss treatment of wet material are solved, and low cost is achieved , efficient and long-term anti-mold effect.
Patent Information
- Application Number
- CN202411367937.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-02-07
AI Technical Summary
There is a lack of a protective treatment method suitable for wet materials, especially raw bamboo wet materials and log wet materials, which are low-cost, effective anti-mold, good loss resistance, safe and environmentally friendly.
By attaching anti-mold agents to the ends of the wet material, using the technology of modifying chitosan-copper complex with acrylamide, the dosage of the agent is reduced, broad-spectrum anti-bacterial and anti-loss properties are improved, and long-term anti-mold effect is achieved. .
It significantly reduces the dosage of anti-mold agents, improves the prevention and treatment effect of a variety of mold rot bacteria, enhances the resistance to loss, meets the long-term anti-mold needs during transportation and storage of wet materials, and avoids end cracking problems.
Smart Images
Figure CN119388535A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of bamboo and wood preventive treatment processes, and specifically to a protective treatment method suitable for wet materials, especially raw bamboo wet materials or raw wood wet materials, to prevent them from mildew and rot. Background Art
[0002] Under some conditions, bamboo and wood need to be transported and stored in the form of wet materials, such as logs, raw bamboo, fresh sawn timber, fresh bamboo chips, etc. Wet materials have a higher moisture content, which is prone to mold and rot, and the ends are prone to evaporation of water, which is also prone to cracking at the ends during transportation and open-air storage.
[0003] For this reason, the prior art generally performs some anticorrosion and anti-mildew treatment on the wet material, such as spraying preservatives and applying end-sealing paint on the ends. However, since the spraying amount of the preservative is relatively large and it needs to be sprayed repeatedly, relatively cheap preservatives are generally used, such as traditional preservatives based on chemical components such as copper, chromium, and arsenic. These preservatives often have certain toxicity, there is a risk of environmental pollution, and poor resistance to loss. Common preservatives include diluted iodopropynyl butyl carbamate, whose toxicity is manifested as irritation and damage to the respiratory system, skin and eyes, and long-term exposure may also lead to more serious health problems, including the risk of cancer; iodopropynyl butyl carbamate enters the environment through air and moisture, causing air pollution and water pollution. In other cases, preservatives based on organic acids, essential oil extracts or other natural ingredients are used. Although these preservatives solve the problems of toxicity and environmental pollution, their use costs are relatively high, and the anti-mildew, anti-corrosion and anti-insect effects are relatively weak, and the anti-loss performance is poor.
[0004] In summary, the prior art lacks a protective treatment method that is suitable for wet materials, especially raw bamboo wet materials and raw wood wet materials, and has relatively low use cost, good mildew and anti-corrosion effects, good anti-loss properties, and is safe and environmentally friendly. Summary of the invention
[0005] In practice, the inventors have noticed the following three points. First, wet materials, including wet raw bamboo materials, wet log materials, fresh sawn materials, fresh bamboo chips, etc., often begin to form mildew and rot from their ends, and the mildew and rot at the ends are further infected and deteriorated to cause mildew and rot in the middle part. The spraying method of the prior art is a non-targeted treatment method, which results in a waste of agents. Therefore, the inventors believe that a targeted treatment method can greatly reduce the amount of agents used, so that some anti-mildew and anti-corrosion agents that are considered too expensive to be used in the wet material stage in the prior art can also be used for treatment in the wet material stage, so as to improve the effect of mildew and mildew prevention and reduce the environmental toxicity of mildew and anti-corrosion treatment of wet materials.
[0006] Second, during the transportation and storage of wet materials, the humidity of the environment in which the materials are located is relatively high, which can easily cause infection by a variety of mildew and rot pathogens. Therefore, the requirements for the broad-spectrum antibacterial properties of the agents are higher than those for finely processed materials (for example, dried sawn timber, veneer, dried bamboo chips, etc.). The more universal the antibacterial properties of the agents used, the better the anti-mildew and anti-corrosion effects on wet materials.
[0007] Third, when wet materials are at a high moisture content, the ends are prone to moisture exchange with the outside world, especially moisture exchange caused by the volatilization of moisture in the wet materials, which makes water-based agents more likely to be lost. In some cases, wet materials being washed by rain during transportation and outdoor storage can also cause a large amount of agent loss, resulting in a short-lived mildew and antiseptic effect.
[0008] Chitosan-copper complex mildew inhibitor is a common and commonly used mildew, antiseptic and antibacterial agent in the prior art. It has a certain broad-spectrum antibacterial property and improved anti-loss property. However, for wet materials, its broad-spectrum and anti-loss property are still not ideal. For example, chitosan-copper complex mildew inhibitor has a good mildew-proof effect on Penicillium citrinum (PC), but has a relatively poor mildew-proof effect on Aspergillius niger (AN) and Trichoderma viride (TV). For another example, on sunny days, the effectiveness of the agent can only be retained on wet materials for about 18 days; on rainy days, the effectiveness of the agent can only be retained on wet materials for about 10 days.
[0009] In the technical solution of the present application, by attaching an anti-mildew agent to the end of the wet material and using acrylamide to modify the chitosan metal complex, the following are achieved: (1) The dosage of the agent is reduced, so that the chitosan-copper complex anti-mildew agent is suitable for use with wet materials in terms of use cost; (2) The broad spectrum of the chitosan-copper complex anti-mildew agent is improved, and it has a relatively high prevention and control effect on a variety of mildew and rot pathogens, which can meet the complex mildew and rot problems that may be formed on wet materials; (3) The anti-loss property of the chitosan-copper complex anti-mildew agent is improved, and even when a large amount of water is exchanged between the wet material and the external environment, it can maintain a certain degree of mildew and anti-corrosion efficiency, so as to meet the long-term requirements for mildew and anti-corrosion during transportation and storage of wet materials. The present application specifically adopts the following technical solutions: A method for protecting wet materials comprises attaching an anti-mildew agent to the end of the wet materials, wherein the anti-mildew agent comprises at least a first component, and the first component comprises a mixed chitosan-copper solution and an acrylamide solution.
[0010] By means of the above treatment method, on one hand, the mildew-proof agent only acts on the end of the wet material, thereby greatly reducing the amount of mildew-proof agent used, making the mildew-proof agent with chitosan-copper solution as the main agent suitable for use with wet materials in terms of use cost.
[0011] On the other hand, the addition of acrylamide solution improves the broad spectrum of the anti-mold agent. At the same time, the addition of acrylamide solution can promote the penetration of chitosan metal complex solution into the ends of bamboo and wood under high moisture content conditions. When the anti-mold agent forms a certain penetration at the end of the wet material, it can improve the anti-loss property of the anti-mold agent, which can be regarded as having long-term anti-mold performance.
[0012] As a preferred embodiment, the anti-mildew agent is attached to the end of the wet material by brushing, spraying and / or soaking.
[0013] As a preferred embodiment, the anti-mildew agent is attached to the end portion including the tip and having a length of 3 to 5 cm.
[0014] As a preferred embodiment, the concentration of the chitosan-copper solution is 2-3%, and the concentration of the acrylamide solution is 2-3%.
[0015] As a preferred embodiment, in the first component, the addition ratio of the chitosan-copper solution and the acrylamide solution is 1:(0.5-2).
[0016] As a preferred embodiment, the anti-mildew agent further includes a second component, the second component includes a water-based phenolic resin adhesive, and in the anti-mildew agent, the addition ratio of the first component to the second component is 1:(1~2.5).
[0017] By means of the above treatment method, after the first component and the second component in the mildew-proof agent are mixed, the first component can be evenly dispersed in the second component, and as the second component solidifies, the second component can respectively cover the particles of the first component, thereby preventing the loss of the first component. At the same time, the presence of the acrylamide solution in the first component can promote the penetration of the chitosan-copper solution while also promoting the penetration of the phenolic resin adhesive, which improves the anti-loss property of the first component in another aspect.
[0018] As an additional technical effect, as the second component solidifies, it can also achieve the technical purpose of sealing the wet material ends, so as to further avoid the problem of end cracking caused by wind, reduced moisture content, etc.
[0019] As a preferred embodiment, the water-based phenolic resin adhesive can be cured at room temperature.
[0020] As a preferred embodiment, the anti-mildew agent is attached to the end portion including the tip and having a length of 0.5 to 2 cm.
[0021] As a preferred embodiment, the end of the wet material is immersed in the anti-mildew agent, taken out and dried naturally.
[0022] As a preferred embodiment, the wet material is raw bamboo wet material or raw wood wet material.
[0023] In summary, the wet material protection method provided in the present application can provide long-term prevention and control against a variety of mildew and rot pathogens, while also being able to achieve an end-sealing effect to avoid the problem of end cracking. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.
[0025] Figure 1 (a) shows the microscopic morphology of chitosan-copper, Figure 1 (b) shows the microscopic morphology of chitosan-copper grafted with acrylamide.
[0026] Figure 2 (a)(c) show the structure and morphology of starch in the cell wall of raw bamboo (labeled as C3). Figure 2 (e) shows the element contents of C, N, and O in starch in the cell wall of raw bamboo wet wood (labeled as C3). Figure 2 (b) (d) show the structure and morphology of starch in the cell wall of the original bamboo wet material (labeled as 19). Figure 2 (f) shows the element contents of starch C, N, and O in the cell wall of raw bamboo wet wood (labeled as 19).
[0027] Figure 3 A comparison of pH values of raw bamboo wet wood (labeled as C3, 19 and C11) is shown. DETAILED DESCRIPTION
[0028] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application. Example
[0029] The chitosan metal complex solution and the acrylamide solution were uniformly mixed by mechanical mixing, wherein the chitosan metal complex was a chitosan-copper complex solution with a concentration of 2.5%, the concentration of the acrylamide solution was 2.5%, and the mass addition ratios of the chitosan-copper complex solution to the acrylamide solution were 1:0.5, 1:1 and 1:2, respectively, to prepare three groups of antifungal agents of this embodiment.
[0030] The three groups of anti-mold agents were applied to both ends of the wet log (rubber wood) by brushing, and the length of the end of the anti-mold agent was 4 cm, including the end. The specimens applied with the three groups of anti-mold agents were marked as 1, 2 and 3 respectively.
[0031] The three groups of anti-mold agents were applied to both ends of the wet log (poplar wood) by brushing, and the length of the end of the anti-mold agent was 4 cm, including the end. The specimens applied with the three groups of anti-mold agents were marked as 4, 5 and 6 respectively.
[0032] The three groups of anti-mold agents were applied to both ends of the original wet bamboo (Moso bamboo) by brushing, and the length of the end where the anti-mold agents were applied was 4 cm, including the end. The specimens applied with the three groups of anti-mold agents were marked as 7, 8 and 9 respectively.
[0033] The three groups of anti-mold agents were applied to both ends of fresh sawn timber (rubber wood) by brushing, and the length of the end where the anti-mold agents were applied was 4 cm, including the end. The specimens applied with the three groups of anti-mold agents were marked as 10, 11 and 12 respectively. Example
[0034] The chitosan metal complex solution and the acrylamide solution were uniformly mixed by mechanical mixing, wherein the chitosan metal complex was a chitosan-copper complex solution with a concentration of 2.5%, the concentration of the acrylamide solution was 2.5%, and the mass addition ratio of the chitosan-copper complex solution to the acrylamide solution was 1:1, thereby preparing the mildew inhibitor of this embodiment.
[0035] The above-mentioned anti-mold agent was applied to both ends of the wet log (rubber wood) by brushing, and the length of the ends of the anti-mold agent was 3 cm and 5 cm, including the ends. The specimen with the length of the end of the anti-mold agent attached was marked as 13, and the specimen with the length of 5 cm was marked as 14.
[0036] The above-mentioned anti-mold agent was applied to both ends of the original bamboo (Moso bamboo) by brushing, and the length of the ends of the anti-mold agent was 3 cm and 5 cm, including the ends. The specimen with the length of the end of the anti-mold agent attached was marked as 15, and the specimen with the length of 5 cm was marked as 16. Example
[0037] The difference between Example 3 and Example 1 is that the mass addition ratio of the chitosan-copper complex solution to the acrylamide solution is 1:1, and the mildew-proof agent is attached to both ends of the original bamboo wet material (moso bamboo) by immersion at room temperature and pressure for 30 minutes. The obtained test pieces are marked as 17 respectively. Example
[0038] The chitosan metal complex solution and the acrylamide solution were uniformly mixed by mechanical mixing, wherein the chitosan metal complex was a chitosan-copper complex solution with a concentration of 2%, the concentration of the acrylamide solution was 2%, and the mass addition ratio of the chitosan-copper complex solution to the acrylamide solution was 1:1, thereby preparing the mildew inhibitor of this embodiment.
[0039] The above-mentioned anti-mildew agent was attached to the two ends of the raw wet wood (rubber wood) and the raw wet bamboo (moso bamboo) by immersion at room temperature and pressure. The length of the end where the anti-mildew agent was attached was 4 cm (including the end, i.e. the length of the end immersed in the anti-mildew agent), and the immersion time was 30 minutes, which were marked as 18 and 19 respectively. Example
[0040] The difference between Example 5 and Example 4 is that the chitosan metal complex is a chitosan-copper complex solution with a concentration of 3%, and the concentration of the acrylamide solution is 3%.
[0041] The specimen whose treatment object is raw wet wood (rubber wood) is marked as 20, and the specimen whose treatment object is raw wet bamboo (moso bamboo) is marked as 21. Example
[0042] The chitosan metal complex solution and the acrylamide solution were uniformly mixed by mechanical mixing, wherein the chitosan metal complex was a chitosan-copper complex solution with a concentration of 2.5%, the concentration of the acrylamide solution was 2.5%, and the mass addition ratio of the chitosan-copper complex solution to the acrylamide solution was 1:1, thereby preparing the first component of the antifungal agent of this embodiment.
[0043] A commercially available water-based room-temperature curing phenolic resin adhesive with a solid content of 30% was used as the second component of the mildew-proof agent of this embodiment.
[0044] The first component and the second component were uniformly mixed by mechanical mixing, wherein the mass addition ratios of the first component and the second component were 1:1, 1:2 and 1:2.5, respectively, to prepare three groups of anti-mildew agents of this embodiment.
[0045] The three groups of anti-mold agents were attached to the two ends of the wet log (rubber wood) by soaking at room temperature and pressure. The length of the end of the anti-mold agent was 2 cm (including the end, i.e. the length of the end immersed in the anti-mold agent). The soaking time was 30 minutes, and the anti-mold agent was naturally cured. The obtained specimens were marked as 22, 23 and 24 respectively.
[0046] The three groups of anti-mold agents were attached to the two ends of the original bamboo (Moso bamboo) by soaking at room temperature and pressure. The length of the end of the anti-mold agent was 2 cm (including the end, i.e. the length of the end immersed in the anti-mold agent). The soaking time was 30 minutes, and the anti-mold agent was naturally cured. The obtained specimens were marked as 25, 26 and 27 respectively. Example
[0047] The chitosan metal complex solution and the acrylamide solution were uniformly mixed by mechanical mixing, wherein the chitosan metal complex was a chitosan-copper complex solution with a concentration of 2.5%, the concentration of the acrylamide solution was 2.5%, and the mass addition ratio of the chitosan-copper complex solution to the acrylamide solution was 1:1, thereby preparing the first component of the antifungal agent of this embodiment.
[0048] A commercially available water-based room temperature curing phenolic resin adhesive with a solid content of 30% was used as the second component of the mildew-proof agent of this embodiment.
[0049] The first component and the second component are uniformly mixed by mechanical mixing, wherein the mass addition ratio of the first component to the second component is 1:2, so as to prepare the mildew inhibitor of this embodiment.
[0050] The above-mentioned anti-mold agent was attached to both ends of the wet log (rubber wood) by immersion at room temperature and pressure. The lengths of the ends of the attached anti-mold agent were 0.5 cm and 1 cm respectively (including the end, i.e. the length of the end immersed in the anti-mold agent). The specimen with the end length of the attached anti-mold agent of 0.5 cm was marked as 28, and the specimen with the length of 1 cm was marked as 29.
[0051] The above-mentioned anti-mildew agent was attached to both ends of the original wet bamboo material (moso bamboo) by immersion at room temperature and pressure. The lengths of the ends of the attached anti-mildew agent were 0.5 cm and 1 cm respectively (including the end, that is, the length of the end immersed in the anti-mildew agent). The specimen with the end length of the attached anti-mildew agent of 0.5 cm was marked as 30, and the specimen with a length of 1 cm was marked as 31.
[0052] Comparative Example 1 Untreated green logs (rubber wood) are marked as C1; untreated green logs (poplar) are marked as C2; untreated green bamboo logs (bamboo) are marked as C3; untreated fresh sawn timber (rubber wood) are marked as C4.
[0053] Comparative Example 2 Wet logs (rubber wood) sprayed with traditional mildew prevention agents (diluted iodopropynyl butylcarbamate) are marked as C5; wet logs (poplar wood) sprayed with traditional mildew prevention agents (diluted iodopropynyl butylcarbamate) are marked as C6; wet bamboo (moso bamboo) sprayed with traditional mildew prevention agents (diluted iodopropynyl butylcarbamate) are marked as C7; fresh sawn timber (rubber wood) sprayed with traditional mildew prevention agents (diluted iodopropynyl butylcarbamate) are marked as C8.
[0054] Comparative Example 3 A 2.5% chitosan-copper complex solution was used as an anti-mold agent. The anti-mold agent was attached to both ends of the wet material by immersion at room temperature and pressure. The length of the end where the anti-mold agent was attached was 4 cm (including the end). The specimens treated with wet logs (rubber wood) were marked as C9, the specimens treated with wet logs (poplar) were marked as C10, the specimens treated with wet bamboo (moso bamboo) were marked as C11, and the specimens treated with fresh sawn timber (rubber wood) were marked as C12.
[0055] Observe the microstructure of the antifungal agent provided in the embodiment of the present application, Figure 1 The microstructure of chitosan-copper and acrylamide graft copolymer in the mildew inhibitor is shown in FIG. 1 , from which it can be seen that chitosan-copper and acrylamide are not mixed relatively independently. In fact, the first component is a solution of the graft copolymer of chitosan-copper and acrylamide.
[0056] The samples of 17 and C3 were taken to observe the changes of starch granules in bamboo treated with antifungal agent under scanning electron microscope. SEM and EDS were used together to analyze the elements on the surface of starch granules in bamboo cells. The results were compared with those of Figure 2 As shown. Those skilled in the art know that the main nutrient in the fiber cells of bamboo and wood is starch. For example, the starch content in bamboo fiber cells reaches 2-6%. The mildew-proof agent provided in the embodiment of the present application can be coated on the starch surface in the cell wall of bamboo or wood, blocking the contact between mold and starch, thereby blocking the growth of mold and preventing the spread of mold. Furthermore, the mildew-proof agent provided in the embodiment of the present application can also change the structure and morphology of starch. Figure 2The structure, morphology and C, N and O element contents of starch in the cell wall of the original bamboo material (C3) and the structure, morphology and C, N and O element contents of starch in the cell wall of the end of the bamboo material of the test piece marked as 17 are shown in the figure. It can be seen that the structure and morphology of starch have shrunk and collapsed, and the C and N contents have been significantly reduced. This further destroys the necessary nutritional environment for the growth of mold, so that the mildew-proof agent of Example 1 has relatively good mildew-proof performance.
[0057] At the same time, the mildew-proof agent provided in the embodiment of the present application can also change the pH value of bamboo or wood fiber. Taking the control specimen marked as C3 (untreated raw bamboo wet material), the specimen marked as 17 and the control specimen marked as C11 as examples, the pH value of bamboo bundles was tested in accordance with GB / T 6043-2009 Method for Determining the pH Value of Wood. The results were as follows: Figure 3 As shown. Figure 3 It can be seen that the pH value of the fiber of the untreated raw bamboo wet material is 5.4, the pH value of the fiber of the raw bamboo wet material impregnated with the anti-mildew agent provided in the embodiment of the present application is 7.3, and the pH value of the fiber of the raw bamboo wet material impregnated with the anti-mildew agent comprising only a chitosan-copper complex solution is 3.9. It is known that the pH value of the suitable environment for the growth and reproduction of mold is 4 to 6, so the ends of the control specimens of C3 and C11 have mildew rot to varying degrees, while the specimen marked as 19 has not. Obviously, the anti-mildew agent provided in the embodiment of the present application can make the pH value of the fiber of the wet material away from the pH value range suitable for mold, so that the pH value of the wet material is not conducive to the survival and growth of mold, thereby achieving a broad-spectrum antibacterial effect.
[0058] When the first component is mixed with the second component, since the first component is evenly dispersed in the second component, the solidified second component can respectively cover the particles of the first component. Therefore, the presence of the second component can further improve the anti-loss property of the antifungal agent.
[0059] At the same time, the sealing effect of the wet material can be achieved by curing the second component.
[0060] The above technical effects can be verified from the test results of each test piece in the embodiment, and the test contents include: The anti-mildew performance test was carried out in accordance with the relevant provisions of the national standard "Test Method for the Control of Wood Mold and Discoloration Fungi by Antifungal Agents" (GB / T 18261-2013). The cycle was 28 days, and the tested fungi were Penicillium citrinum (PC), Aspergillius niger (AN) and Trichoderma viride (TV). The results are shown in Table 1.
[0061] First, the anti-loss test was performed in accordance with the national standard GB / T 29905-2013, and then the anti-mildew performance test after the anti-loss test was performed in accordance with the relevant provisions of the national standard "Test Method for the Control of Wood Mildew and Discoloration Fungi by Mildew Inhibitors" (GB / T 18261-2013). The cycle was 28 days, and the test strain was Penicillium citrinum (PC); at the same time, the end cracking was observed. The results are shown in Table 2.
[0062] Table 1
[0063] Table 2
[0064] The above description is intended to be illustrative and not limiting. Upon reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the applicant has not considered the subject matter to be part of the disclosed application subject matter.
Claims
1. A method for protecting wet materials, characterized in that: The method comprises attaching an anti-mold agent to the end of the wet material, wherein the anti-mold agent comprises at least a first component, and the first component comprises a mixed chitosan-copper solution and an acrylamide solution.
2. The wet material protection method according to claim 1, characterized in that: The anti-mold agent is attached to the end of the wet material by brushing, spraying and / or soaking.
3. The method for protecting wet materials according to claim 1, characterized in that: The antifungal agent is attached to the end portion including the tip and having a length of 3 to 5 cm.
4. The method for protecting wet materials according to claim 1, characterized in that: The concentration of the chitosan-copper solution is 2-3%, and the concentration of the acrylamide solution is 2-3%.
5. The method for protecting wet materials according to claim 1, characterized in that: In the first component, the addition ratio of the chitosan-copper solution to the acrylamide solution is 1:(0.5-2).
6. The method for protecting wet materials according to claim 1, characterized in that: The anti-mildew agent also includes a second component, the second component includes a water-based phenolic resin adhesive, and in the anti-mildew agent, the addition ratio of the first component to the second component is 1: (1-2.5).
7. The method for protecting wet materials according to claim 6, characterized in that: The water-based phenolic resin adhesive can be cured at room temperature.
8. The method for protecting wet materials according to claim 6, characterized in that: The antifungal agent is attached to the end portion including the tip and having a length of 0.5 to 2 cm.
9. The method for protecting wet materials according to claim 6, characterized in that: The end of the wet material is immersed in the anti-mold agent, taken out and dried naturally.
10. The wet material protection method according to claim 1, characterized in that: The wet wood is raw bamboo wet wood or raw wood wet wood.