An efficient wood industry heat treatment process

Abstract

The application discloses a high-efficiency wood heat treatment process, which comprises the following steps: providing a promoting liquid; soaking wood into the promoting liquid; providing a spraying liquid and spraying the wood after soaking with the spraying liquid; heat treating the wood after spraying to decompose fibers or semi-fibers; polishing the surface of the wood after heat treatment; providing a stabilizer; performing a shaping treatment by soaking the wood after heat treatment into the stabilizer; and performing a drying treatment by providing a high-frequency vacuum dryer and drying the wood. The high-efficiency wood heat treatment process can achieve the purpose of high-temperature heat treatment of wood at a lower temperature level by providing the promoting liquid, and the wood heat treatment is efficient, the requirement for heat treatment equipment is reduced, the heat treatment temperature is reduced, energy is saved, and the production cost of wood is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wood processing, in particular to a high-efficiency wood heat treatment process. BACKGROUND

[0002] Wood heat treatment is also known as wood heat modification. The definition of wood heat treatment in the EU standard (CEN / TS 15679:2007) is: a treatment that can change the cell wall structure and physical properties under a low-oxygen environment at a temperature higher than 160℃. The wood after heat treatment has good corrosion and insect prevention functions because its nutrients are destroyed. The wood after heat treatment has good physical properties because the water absorption functional group hemicellulose is reorganized. The deep heat treatment preservative wood is a truly green and environmentally friendly product because it has corrosion and insect prevention properties without containing any harmful substances. It not only improves the service life of wood, but also has no negative impact on human beings, animals and the environment during production, use and waste treatment after use.

[0003] It is known that the process of wood heat treatment can be divided into three stages. The first stage is the release stage of water and gas. When the wood is heated to about 100 degrees, the water in the wood will begin to evaporate and some gas will be released. The second stage is the release stage of volatile organic compounds. When the temperature rises to about 180 degrees, the volatile organic compounds in the wood will begin to decompose and release gas and liquid. The third stage needs to be kept at about 180 degrees to continue the heat treatment of the wood. The time of the three stages is more than 5 hours. Therefore, the temperature required by the above wood heat treatment process is too high, the energy consumption is too high, and the heat treatment time is too long, which affects the wood processing efficiency and increases the production cost. SUMMARY

[0004] Therefore, the present application provides a high-efficiency wood heat treatment process to solve the above technical problems.

[0005] A high-efficiency wood heat treatment process, comprising the following steps:

[0006] STEP 101: providing a promoting liquid, the promoting liquid comprising aluminum chloride, potassium carbonate and acetic anhydride, the aluminum chloride accounting for 20-25 parts, the potassium carbonate accounting for 11-32 parts, and the acetic anhydride accounting for 30-55 parts, the rest being water, based on 100 parts;

[0007] STEP 102: soaking the wood in the promoting liquid for 1-5 hours;

[0008] STEP 103: providing a spraying liquid, and spraying the wood after soaking with the spraying liquid, the spraying liquid being an aluminum dihydrogen phosphate solution, wherein the concentration of the aluminum dihydrogen phosphate is 12% to 17%;

[0009] STEP 104: heat treatment: heat treating the wood after spraying to resolve fibers or semi-fibers, the heat treatment temperature being 120 degrees to 140 degrees, and the heat treatment time being 2 to 4 hours;

[0010] STEP 105: polishing: polishing the surface of the wood after heat treatment;

[0011] STEP 106: providing a stabilizer, the stabilizer including cationic polyvinyl alcohol and ethanol, the cationic polyvinyl alcohol accounting for 13 parts to 42 parts and the ethanol accounting for 57 parts to 81 parts in 100 parts;

[0012] STEP 107: shaping treatment: soaking the wood after heat treatment in the stabilizer, the soaking time being 0.5 to 3 hours;

[0013] STEP 108: drying treatment: providing a high-frequency vacuum dryer and drying the wood.

[0014] Further, in the promoting liquid, the aluminum chloride accounts for 22 parts, the potassium carbonate accounts for 17 parts, and the acetic anhydride accounts for 41 parts in 100 parts, and the rest is water.

[0015] Further, the wood is soaked in the promoting liquid for 2.5 hours.

[0016] Further, the heat treatment temperature is 130 degrees, and the heat treatment time is 3.5 hours.

[0017] Further, in the promoting liquid, the aluminum chloride accounts for 27 parts, the potassium carbonate accounts for 23 parts, and the acetic anhydride accounts for 37 parts, and the rest is water.

[0018] Further, the wood is soaked in the promoting liquid for 3 hours.

[0019] Further, the heat treatment temperature is 140 degrees, and the heat treatment time is 2.5 hours.

[0020] Further, in the stabilizer, the cationic polyvinyl alcohol accounts for 22 parts, and the ethanol accounts for 57 parts in 100 parts, and the rest is water.

[0021] Further, in the stabilizer, the cationic polyvinyl alcohol accounts for 24 parts, and the ethanol accounts for 61 parts in 100 parts, and the rest is water.

[0022] Compared with the prior art, the high-efficiency wood heat treatment process provided by the application can achieve the purpose of high-temperature heat treatment of wood at a lower temperature level by providing a promoting liquid, and the high-efficiency heat treatment of wood can reduce the requirements for heat treatment equipment and the heat treatment temperature, thereby saving energy. Specifically, the aluminum chloride can make part of the cellulose dissolve in the aqueous solution and part of the cellulose degrade into small-molecule sugars under the action of the acid, so as to reduce the heat treatment temperature. The potassium carbonate can protect the color of the wood to prevent the color of the wood from fading during heat treatment, thereby laying a foundation for the use of aluminum chloride. The acetic anhydride can soften the fibers, and the softened fibers have a larger heating area during heat treatment, thereby improving the efficiency of heat treatment. The spraying of the aluminum dihydrogen phosphate can re-adhere the decomposed fibers and semi-fibers together, thereby forming a protective film on the surface of the wood, and thus the mechanical properties of the wood can be prevented from being greatly lost due to severe carbonization of the surface of the wood during heat treatment. Therefore, through the soaking and spraying processes, the mechanical properties of the wood after heat treatment can be improved, and the stability of the size of the wood after heat treatment can be ensured. Meanwhile, after heat treatment, the cationic polyvinyl alcohol can further achieve the function of color protection, and the ethanol can react with the acetate ions in the wood to form ester substances, thereby improving the stability and mechanical strength of the wood, so that the efficiency of heat treatment can be improved, and the production cost of the wood can be reduced. DETAILED DESCRIPTION

[0023] The specific embodiments of the application are further described below. It should be understood that the description of the embodiments of the application herein is not intended to limit the protection scope of the application.

[0024] A high-efficiency wood heat treatment process, comprising the following steps:

[0025] STEP 101: providing a promoting liquid, the promoting liquid comprising aluminum chloride, potassium carbonate, and acetic anhydride, wherein the aluminum chloride accounts for 20-25 parts, the potassium carbonate accounts for 11-32 parts, and the acetic anhydride accounts for 30-55 parts, and the rest is water, based on 100 parts;

[0026] STEP 102: soaking wood in the promoting liquid for 1-5 hours;

[0027] STEP 103: providing a spraying liquid to spray the spraying liquid on the soaked wood, the spraying liquid being an aluminum dihydrogen phosphate solution, wherein the concentration of the aluminum dihydrogen phosphate is 12%-17%;

[0028] STEP 104: heat treatment: heat treating the sprayed wood to decompose fibers or semi-fibers, the heat treatment temperature being 120-140 degrees, and the heat treatment time being 2-4 hours.

[0029] STEP 105: polishing, polishing the surface of the wood after heat treatment;

[0030] STEP 106: providing a stabilizer, the stabilizer includes cationic polyvinyl alcohol and ethanol, the cationic polyvinyl alcohol accounts for 13-42 parts, the ethanol accounts for 57-81 parts, and the rest is water;

[0031] STEP 107: shaping treatment, soaking the heat-treated wood in the stabilizer for 0.5-3 hours;

[0032] STEP 108: drying treatment, providing a high-frequency vacuum dryer and drying the wood.

[0033] In STEP 101, the aluminum chloride can dissolve part of the cellulose in the aqueous solution, and part of the cellulose is degraded into small molecular sugars under the action of acid, so that the structure and composition of the cellulose after treatment are greatly changed. Specifically, the aluminum chloride solution can fragment the small amount of lignin connected to the cellulose, thereby gradually degrading into low molecular weight branched chains to facilitate subsequent heat treatment, achieving the purpose of improving the efficiency of heat treatment. The amount of aluminum chloride should be limited to 20-25 parts, too little will not achieve the above purpose, and too much will make the solution too strong, leaving too much residue, affecting subsequent processes such as spraying and painting.

[0034] The potassium carbonate and the aluminum chloride and acetic anhydride complement each other, because potassium carbonate can react with acetic acid to form potassium acetate, thereby protecting the color of the wood, so that the color of the wood will not change due to the use of aluminum chloride, which lays the foundation for the use of aluminum chloride. Because aluminum chloride forms acid, which is used to degrade into small molecular sugars. At the same time, the potassium carbonate can also absorb the carbon dioxide generated during the heat treatment process. The content of potassium carbonate is 11-32 parts, which is too high will excessive consume acetic anhydride, making it difficult to achieve its purpose of softening the fiber, thereby reducing the effect of acetic anhydride and producing excessive potassium acetate, causing pollution, too low will not be able to meet the requirements of color protection.

[0035] The acetic anhydride is used to soften the fiber, thereby improving the efficiency of heat treatment, because the softened fiber has a larger heating area during heat treatment, thereby improving the efficiency of heat treatment. However, the content of acetic anhydride should be limited to 30-55 parts, and excessive acetic anhydride will corrode the equipment, and too low content will not be able to fully promote the decomposition and softening of the fiber.

[0036] In STEP 102, the soaking time is 1-5 hours, too short to fully soak the soaking liquid, and too long will reduce the corresponding production efficiency.

[0037] In STEP 103, the aluminum dihydrogen phosphate is used as a high-temperature protective agent to protect the mechanical properties of the wood, i.e., it can re-adhere the softened and decomposed fibers and semi-fibers at high temperatures, thereby forming a protective film on the surface of the wood, which can avoid the severe charring of the wood surface during heat treatment, thereby reducing the mechanical properties of the wood and the quality of the wood. The use of spraying not only avoids the escape of the promoting liquid that has entered the interior of the wood, but also has higher spraying efficiency and lower cost. At the same time, spraying can only form residual aluminum dihydrogen phosphate on the surface of the wood, avoiding its penetration into the interior of the wood.

[0038] In STEP 104, it is well known that cellulose or hemicellulose belongs to biomass materials, which will undergo pyrolysis reaction to generate lignin and other products after heating, and heat treatment occurs during heating, which helps to improve the stability of the wood. The heat treatment process itself is prior art, but in the present invention, by soaking the promoting liquid, the time and temperature of heat treatment can be reduced. Specifically, an industrial box-type heat treatment kiln is used for medium-temperature heat treatment of the wood, with water vapor as the protective gas, and the loading capacity is 30-40 m 3 / kiln. The medium-temperature heat treatment process is divided into a preheating stage, a heating stage, a heat treatment (heat preservation) stage, and a cooling stage. The air pressure is maintained at 20 kPa during the entire heat treatment process. The temperature is raised at a rate of 5°C / h before 70°C; when the temperature rises to 70-100°C, it is raised by 5°C every 2 h; when the temperature rises to 100-140°C, it is raised by 5°C every 3 h, and the temperature is maintained at 140°C for 10 h, and then gradually cooled down at a rate of 5-8°C / h; after the temperature is lower than 50°C, the kiln is opened and the wood is taken out.

[0039] In STEP 105, polishing not only removes impurities on the surface of the wood, but also removes aluminum dihydrogen phosphate on the surface of the wood, improves the penetration rate of the stabilizer, and also removes the carbonized layer on the surface of the wood, thereby improving the processing performance of the wood surface, such as painting, etc.

[0040] In STEP 106, the cationic polyvinyl alcohol has the function of color protection, and can enhance the flexibility of the fiber, and also can improve the mechanical strength of the wood. Because after heat treatment, the hydrogen group on the main chain of the cationic polyvinyl alcohol polymer can also react with the hydrogen group and amino group on the fiber to form a covalent bond, even form cross-linking (or form a network structure on the surface of the fiber), inhibit the swelling of the fiber, and prevent the colorant molecules from desorbing from the fiber. In addition, the cationic polyvinyl alcohol itself is a film-forming material, which can form a film on the surface of the fabric, increase the smoothness of the fiber, reduce the friction coefficient, prevent the colored fiber dust from being rubbed off, and thus achieve the function of color protection. At the same time, the cationic polyvinyl alcohol can provide high retention performance of the fiber, thereby improving the ductility and flexibility of the paper. However, the content of the cationic polyvinyl alcohol should be limited to 3-42 parts, and too high content will hinder the penetration of the cationic polyvinyl alcohol into the wood, and it is difficult to achieve the purpose of color protection, and too low content cannot achieve the purpose of toughening the wood fiber and improving the mechanical strength of the wood.

[0041] The ethanol can react with the acetate ions in the wood to form ester substances, thereby improving the stability and mechanical strength of the wood. Part of the acetate ions in the wood are produced during the decomposition of the fiber in the wood, and part of the acetate ions are penetrated into the wood during the soaking of the promoting liquid. The ester substances generated by the reaction of the ethanol and the acetate ions are filled in the interior of the wood, thereby improving the stability and mechanical strength of the wood. At the same time, the content of the ethanol should be limited to 57-81 parts, and too high content will cause waste of ethanol resources, and too low content cannot fully reflect the residual acetate.

[0042] In STEP 107, the soaking time of the stabilizer in the wood should be limited to 0.5-3h, and too short time will lead to that the repair cannot penetrate into the wood, and form effective reaction, and too long time will lead to low production efficiency, and also lead to the exudation of the generated repair components.

[0043] In STEP 108, the high-frequency vacuum dryer is a prior art, and its operation is known to those skilled in the art, and will not be described here. After drying, the moisture content of the wood is related to the type of wood, and can be adjusted according to the actual situation.

[0044] Compared with the prior art, the high-efficiency wood heat treatment process provided by the application can achieve the purpose of high-temperature heat treatment of wood at a lower temperature level by providing a promoting liquid, and the high-efficiency heat treatment of wood can reduce the requirements on the heat treatment equipment and the heat treatment temperature, save energy, and specifically, the aluminum chloride can make part of the cellulose dissolve in the aqueous solution and part of the cellulose degrade into small-molecule sugars under the action of the acid, so that the heat treatment temperature can be reduced, the potassium carbonate can protect the color of the wood to prevent the color of the wood from fading during heat treatment, and lays a foundation for the use of the aluminum chloride. The acetic anhydride can soften the fibers, and the softened fibers have a larger heating area during heat treatment, so that the efficiency of heat treatment can be improved. The spraying of the aluminum dihydrogen phosphate can re-adhere the softened and decomposed fibers and semi-fibers together, so that a protective film is formed on the surface of the wood, and thus the mechanical properties of the wood can be prevented from being greatly lost due to severe carbonization of the surface of the wood during heat treatment. Therefore, through the soaking and spraying processes, the mechanical properties of the wood after heat treatment can be improved, and the stability of the size of the wood after heat treatment can be ensured. Meanwhile, after heat treatment, the cationic polyvinyl alcohol can further achieve the function of color protection, and the ethanol can react with the acetate ions in the wood to form ester substances, so that the stability and mechanical strength of the wood are improved, so that the efficiency of heat treatment can be improved, and the production cost of the wood can be reduced.

[0045] Experimental material: olive wood (500*200*20mm, moisture content 11.7%)

[0046] Example 1

[0047] STEP 101: providing a promoting liquid, the promoting liquid comprising aluminum chloride, potassium carbonate and acetic anhydride, the aluminum chloride accounting for 22 parts, the potassium carbonate accounting for 17 parts, and the acetic anhydride accounting for 41 parts in 100 parts, and the rest being water;

[0048] STEP 102: soaking the wood in the promoting liquid for 2.5 hours;

[0049] STEP 103: providing a spraying liquid, removing the surface water and impurities after taking out the wood, and spraying a 15% aluminum dihydrogen phosphate solution;

[0050] STEP 104: heat treatment: heat treating the wood after the spraying treatment to decompose cellulose, hemicellulose and lignin, the heat treatment temperature being 130 degrees, and the heat treatment time being 3.5 hours;

[0051] STEP 105: polishing, polishing the surface of the wood after heat treatment;

[0052] STEP 106: providing a stabilizer, the stabilizer including cationic polyvinyl alcohol and ethanol, the cationic polyvinyl alcohol accounting for 24 parts, the ethanol accounting for 61 parts, and the rest being water, in 100 parts;

[0053] STEP 107: shaping treatment, soaking the heat-treated wood in the stabilizer for 2 hours;

[0054] STEP 108: drying treatment, providing a high-frequency vacuum dryer and drying the wood.

[0055] Example 2

[0056] STEP 101: providing an accelerating liquid, the accelerating liquid including aluminum chloride, potassium carbonate, and acetic anhydride, the aluminum chloride accounting for 27 parts, the potassium carbonate accounting for 23 parts, and the acetic anhydride accounting for 37 parts, in 100 parts, and the rest being water;

[0057] STEP 102: soaking the wood in the accelerating liquid for 3 hours;

[0058] STEP 103: providing a spraying liquid, removing surface water and impurities after taking out the wood, and spraying a di-aluminum hydrogen phosphate solution with a concentration of 16%;

[0059] STEP 104: heat treatment, heat treating the wood after the spraying treatment to decompose cellulose, hemicellulose, and lignin, the heat treatment temperature being 140 degrees, and the heat treatment time being 3 hours;

[0060] STEP 105: polishing, polishing the surface of the wood after the heat treatment;

[0061] STEP 106: providing a stabilizer, the stabilizer including cationic polyvinyl alcohol and ethanol, the cationic polyvinyl alcohol accounting for 24 parts, the ethanol accounting for 61 parts, and the rest being water, in 100 parts;

[0062] STEP 107: shaping treatment, soaking the heat-treated wood in the stabilizer for 2 hours;

[0063] STEP 108: drying treatment, providing a high-frequency vacuum dryer and drying the wood.

[0064] Example 3

[0065] STEP 101: providing an accelerating liquid, the accelerating liquid including aluminum chloride, potassium carbonate, and acetic anhydride, the aluminum chloride accounting for 27 parts, the potassium carbonate accounting for 23 parts, and the acetic anhydride accounting for 37 parts, in 100 parts, and the rest being water;

[0066] STEP 102: Soaking the wood in the accelerating liquid for 3h;

[0067] STEP 103: Providing a spraying liquid, removing the surface water and impurities after taking out the wood, and spraying a 16% aluminum dihydrogen phosphate solution;

[0068] STEP 104: Heat treatment: heat treating the wood after spraying treatment to decompose cellulose, hemicellulose and lignin, heat treatment temperature is 140 degrees, heat treatment time is 2.5h;

[0069] STEP 105: Polishing, polishing the surface of the wood after heat treatment;

[0070] STEP 106: Providing a stabilizer: the stabilizer includes cationic polyvinyl alcohol and ethanol, the cationic polyvinyl alcohol accounts for 22 parts, the ethanol accounts for 57 parts, and the rest is water, accounting for 100 parts;

[0071] STEP 107: Shaping treatment: soaking the heat-treated wood in the stabilizer for 2h;

[0072] STEP 108: Drying treatment: providing a high-frequency vacuum dryer and drying the wood.

[0073] Comparative Example

[0074] STEP 101: Water soaking for 3h

[0075] STEP 102: Heat treatment in a carbonization kiln at a temperature of 140℃ for 3.5h;

[0076] STEP 103: Soaking in water for 2h;

[0077] STEP 104: High-frequency vacuum drying;

[0078] Detection method: The bending strength and the compression strength along the grain were determined according to GB / T 1936.1-2021 "Wood Bending Strength Determination Method" and GB / T 1935-2021 "Wood Compression Strength Along the Grain Determination Method", respectively. The dry shrinkage and wet swelling were determined according to GB / T 1932-2021 "Wood Dry Shrinkage Determination Method" and GB / T 1934.2-2021 "Wood Wet Swelling Determination Method", respectively. There were 30 test pieces in each group, with a size of 20mm×20mm×20mm (L×W×T). The test environment temperature was maintained at 20℃ during the test piece wet swelling test. The volume anti-wet swelling rate ASEw and the volume anti-dry shrinkage rate ASEh were calculated according to formulas (1) and (2), respectively, with an accuracy of 0.1%.

[0079]

[0080] In the formula: ASEw and ASEh are the anti-wet swelling rate (%) and the anti-shrinkage rate (%), respectively, ε0 is the wet swelling rate (%) of untreated olive wood, ε1 is the wet swelling rate (%) of the heat-treated wood, β0 is the dry shrinkage rate (%) of untreated olive wood, and β1 is the dry shrinkage rate (%) of the heat-treated wood.

[0081] Test results

[0082]

[0083] Examples 1-3 are olive woods treated using the heat treatment process of the present application, the comparative example is a conventional heat-treated olive wood that has not been treated using the high-efficiency process, and the blank group is an olive wood that has not been heat-treated.

[0084] As can be seen from the data in the table, compared with the comparative example, the mechanical properties of the olive wood treated using the high-efficiency heat treatment process of the present application decrease less, and the dimensional stability performance increases more. Compared with the blank group, the olive wood treated using the normal heat treatment process has a lower heat treatment temperature but a longer heat treatment time, so the mechanical properties of the heat-treated olive wood increase more and the dimensional stability performance increases less.

[0085] The above merely describes the preferred embodiments of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, or improvement within the spirit of the present application is encompassed within the protection scope of the present application.

Claims

1. A high-efficiency wood heat treatment process, comprising the following steps STEP101: Provide an accelerator solution, which includes aluminum chloride, potassium carbonate, and acetic anhydride. In 100 parts, the aluminum chloride accounts for 20 to 25 parts, the potassium carbonate accounts for 11 to 32 parts, and the acetic anhydride accounts for 30 to 55 parts, with the remainder being water. The potassium carbonate, aluminum chloride, and acetic anhydride work synergistically because the potassium carbonate reacts with acetic acid to form potassium acetate, thereby protecting the color of the wood and preventing the wood color from being changed by the use of aluminum chloride. STEP 102: Immerse the wood in the accelerator solution for 1 to 5 hours; STEP103: Provide a spraying solution to spray the soaked wood with the spraying solution, wherein the spraying solution is an aluminum dihydrogen phosphate solution, wherein the concentration of the aluminum dihydrogen phosphate is 12% to 17%, and the aluminum dihydrogen phosphate re-bonds the softened and decomposed fibers and hemifibers together to form a protective film on the surface of the wood. STEP104: Heat treatment: The sprayed wood is subjected to heat treatment to decompose the fibers or hemifibers. The heat treatment temperature is between 120 and 140 degrees Celsius, and the heat treatment time is 2 to 4 hours. STEP105: Polishing: Polish the surface of the heat-treated wood. STEP106: Provide a stabilizer: The stabilizer comprises cationic polyvinyl alcohol and ethanol, in 100 parts, the cationic polyvinyl alcohol accounts for 13 to 42 parts, and the ethanol accounts for 57 to 81 parts. The hydrogen groups on the main chain of the cationic polyvinyl alcohol polymer react with the hydrogen groups and amino groups on the fiber to form covalent bonds, thereby inhibiting fiber swelling and preventing pigment molecules from desorbing from the fiber. The esters generated by the reaction of ethanol with the acetate ions fill the interior of the wood to improve the stability and mechanical strength of the wood. STEP 107: Shaping treatment: Immerse the heat-treated wood in the stabilizer for 0.5 to 3 hours; STEP108: Drying process: Provide a high-frequency vacuum dryer and dry the wood.

2. The high-efficiency wood heat treatment process as described in claim 1, characterized in that: In the promoting solution, per 100 parts, aluminum chloride accounts for 22 parts, potassium carbonate accounts for 17 parts, and acetic anhydride accounts for 41 parts, with the remainder being water.

3. The high-efficiency wood heat treatment process as described in claim 2, characterized in that: The wood was soaked in the accelerator solution for 2.5 hours.

4. The high-efficiency wood heat treatment process as described in claim 3, characterized in that: The heat treatment temperature is 130 degrees Celsius, and the heat treatment time is 3.5 hours.

5. The high-efficiency wood heat treatment process as described in claim 1, characterized in that: The wood is soaked in the accelerator solution for 3 hours.

6. The high-efficiency wood heat treatment process as described in claim 5, characterized in that: The heat treatment temperature is 140 degrees Celsius, and the heat treatment time is 2.5 hours.

7. The high-efficiency wood heat treatment process as described in claim 1, characterized in that: In the stabilizer, per 100 parts, the cationic polyvinyl alcohol accounts for 22 parts, the ethanol accounts for 57 parts, and the remainder is water.

8. The high-efficiency wood heat treatment process as described in claim 1, characterized in that: In the stabilizer, per 100 parts, the cationic polyvinyl alcohol accounts for 24 parts, the ethanol accounts for 61 parts, and the remainder is water.

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