Method for uniformly and efficiently regulating and controlling cell wall components and structures of large-volume blocky bamboo and wood

Abstract

The invention provides a method for uniformly and efficiently regulating and controlling cell wall components and structures of large-volume blocky bamboo and wood. The method comprises the following steps: (1) processing the bamboo and wood into a cylindrical test piece with a smooth side surface; (2) drying the cylindrical test piece; (3) putting the cylindrical test piece into a sealed container, sealing the side surface of the cylindrical test piece, and only reserving the cross sections at the two ends of the cylindrical test piece to be exposed; (4) connecting a pipeline with the cross sections of the two ends of the sealed cylindrical test piece, and connecting the pipeline with a propeller; (5) inputting the reaction liquid into the cylindrical test piece through a pipeline by utilizing a propeller; (6) putting the cylindrical test piece into a special external field and continuously circulating the liquid; (7) replacing the reaction liquid with washing liquid, circulating the washing liquid, and removing redundant reaction liquid; and (8) replacing the washing liquid with a bamboo and wood shrinking liquid, circulating the bamboo and wood shrinking liquid to slightly shrink the volume of the cylindrical test piece, and then taking out the final cylindrical test piece. According to the method, cell wall components and structures of the large-volume blocky bamboo wood can be uniformly regulated and controlled, and reaction liquid and by-products can be efficiently removed from the interior of the bamboo wood.

Description

Technical Field

[0001] The invention relates to the technical field of bamboo wood cell wall component and structure regulation, and in particular to a method for uniformly and efficiently regulating the cell wall component and structure of large-volume block bamboo wood. Background Art

[0002] In recent years, a large number of researchers have shown great interest in developing advanced functional materials based on the manipulation of bamboo and wood cell walls. These researchers have successfully developed a range of advanced wood-based functional materials, including super-strong wood, wood sponges, transparent wood, and photonic wood. By partially or completely removing lignin or hemicellulose from wood, various effects have been achieved, such as increasing micropores, exposing cellulose hydroxyl groups, and removing pigment groups. This provides a solid foundation for the subsequent functionalization of wood.

[0003] Currently, methods for removing bamboo wood components mainly include chemical treatment (such as using NaOH+Na2SO3, NaOH+Na2S, or NaOH to partially remove lignin and hemicellulose, and sodium perchlorate+acetic acid, or hydrogen peroxide+sodium hydroxide to completely remove lignin), physical treatment (such as ultraviolet light degradation), and biological treatment (including enzyme treatment and bacterial treatment). These methods require direct contact with wood components and chemical reactions to achieve degradation and removal of wood components.

[0004] However, in the prior art, it is difficult for chemical agents to effectively penetrate into large pieces of wood and bamboo, making it impossible to effectively treat the bamboo wood components. For particularly thick pieces of wood or difficult-to-penetrate bamboo, the agents cannot even enter their interior. Even if the agents can penetrate, the subsequent cleaning process will hardly remove all byproducts. In addition, during the treatment process, the substance usually first contacts the outer layer and then slowly penetrates into the core layer of the bamboo wood, resulting in rapid removal of the outer cell wall components and slow degradation of the components in the center. When the components of the center layer are finally removed, the cellulose in the outer layer may also be partially degraded due to the long reaction time, resulting in differences in the components and structure of the outer layer and the center layer, ultimately making it impossible to achieve uniform removal of the wood components and uniform transformation of the wood microstructure. Light treatment and biological treatment methods also have similar problems.

[0005] Therefore, it is currently impossible to achieve uniform and efficient removal of large-sized block wood components and uniform structural transformation, which limits the development of advanced wood-based functional materials. Summary of the Invention

[0006] In response to the technical problems existing in the above-mentioned background technology, the present invention proposes a method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, which can achieve uniform regulation of the cell wall components and structure of large-volume block bamboo wood, and can achieve efficient removal of reaction liquid and by-products from the interior of the bamboo wood, so that there is no impurity residue in the treated specimens.

[0007] To solve the above technical problems, the present invention provides a method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, which comprises the following steps:

[0008] (1) Process the bamboo wood into cylindrical specimens with smooth sides;

[0009] (2) drying the cylindrical test piece obtained in step (2) above and allowing it to shrink;

[0010] (3) First, place the cylindrical specimen dried in step (2) above into a sealed container, and then seal the sides of the cylindrical specimen, leaving only the cross-sections at both ends exposed;

[0011] (4) Connecting the pipe to the cross sections of both ends of the cylindrical test piece sealed in step (3) above, and connecting the pipe to the propeller;

[0012] (5) The reaction liquid is then introduced into the interior of the cylindrical specimen through the pipe and the cross sections of both ends of the cylindrical specimen using a propeller;

[0013] (6) placing the cylindrical specimen in a special external field and using a propeller to pass the reaction solution through a pipe into the interior of the cylindrical specimen for continuous circulation, thereby achieving uniform and efficient treatment of the cell wall components of the cylindrical specimen;

[0014] (7) replacing the reaction liquid with a washing liquid, using a propeller to input the washing liquid into the interior of the cylindrical specimen through a pipeline and continuously circulate it inside the cylindrical specimen to remove the reaction liquid inside the cylindrical specimen;

[0015] (8) The washing liquid is then replaced with bamboo wood shrinkage liquid, which is then introduced into the cylindrical specimen through a pipe using a propeller and continuously circulated inside the cylindrical specimen, causing the volume of the cylindrical specimen to shrink slightly, and then the final cylindrical specimen is taken out.

[0016] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood comprises: the cylindrical test piece having a diameter of 1 mm to 500 mm and a length of 1 cm to 200 cm.

[0017] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, wherein the drying conditions of the cylindrical test piece in step (2) are: drying temperature 60°C to 105°C, drying time 1h to 48h, and final moisture content after drying 0% to 10%.

[0018] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood comprises the following steps: the step (3) is to place a dried and sealed cylindrical specimen into a sealed container, and then introduce a bamboo wood swelling agent, so that the bamboo wood swelling agent expands and adheres tightly to the sealed container, thereby sealing the side of the cylindrical specimen.

[0019] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood comprises the following steps: the bamboo wood swelling agent is water.

[0020] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, wherein: in step (3), other shrinkable substances other than the bamboo wood swelling agent and not corroded by the reaction solution can also be used to seal the sides of the cylindrical test piece.

[0021] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, wherein: the reaction liquid can be any one of NaOH+Na2SO3 solution, NaOH+Na2S solution, NaOH solution, sodium perchlorate+acetic acid solution, hydrogen peroxide+sodium hydroxide solution, and peracetic acid+sodium hydroxide solution.

[0022] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, wherein: the special external field in step (6) can be any one of a heating field, a magnetic field and a cooling field.

[0023] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, wherein: the washing liquid in step (7) is water.

[0024] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood, wherein: the bamboo wood shrinkage liquid in step (8) is ethanol.

[0025] By adopting the above technical solution, the present invention has the following beneficial effects:

[0026] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo wood of the present invention is rationally conceived, can achieve uniform regulation of the cell wall components and structure of large-volume block bamboo wood, can achieve efficient removal of reaction liquid and by-products from the interior of the bamboo wood, and achieve no impurity residue in the treated test piece.

[0027] The biggest advantage of the present invention is that it solves the problem that the components of large-scale wood and bamboo samples cannot be evenly processed. The current traditional method mainly removes components by soaking and boiling wood and bamboo materials. In this way, it is difficult for the reagents to penetrate into the interior of large-scale wood and bamboo materials, and the interior cannot be processed. There are also proposals to process wood and bamboo materials through natural transpiration, but without external force, the reagents have limited effect on long samples, and it is impossible to achieve the removal of by-products and reagents after the reaction. The present invention can not only achieve the component processing of large-scale samples but also ensure the removal of reagents after the reaction without residue. It can also achieve consistent surface and core layer treatment effects, and will not have the problem of fast surface reaction and slow core layer reaction during immersion treatment. In addition, the present invention circulates the reagents into the interior of the wood and bamboo materials, so the amount of reagents used is less. The same reaction system uses this method with lower dosage and lower cost. The present invention is applicable to a variety of wood and bamboo component processing systems, with a wide range of applications and great application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 Schematic diagram of the reaction process involved in the method for uniformly and efficiently regulating the cell wall components and structure of large-volume bamboo wood blocks of the present invention;

[0030] Figure 2 Schematic diagram of the cleaning process involved in the method for uniformly and efficiently regulating the cell wall components and structure of large-volume bamboo wood blocks of the present invention;

[0031] Figure 3 This is a picture of the wood sample after 48 hours of treatment using the traditional soaking method;

[0032] Figure 4 This is a picture of the wood sample after 48 hours of treatment using the traditional soaking method. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] The present invention will be further explained below with reference to specific embodiments.

[0035] This embodiment provides a method for uniformly and efficiently regulating the cell wall composition and structure of large-volume bamboo wood blocks, comprising the following steps:

[0036] (1) The bamboo wood is formed into a cylindrical specimen with smooth sides to facilitate sealing of the rear side;

[0037] (2) drying the cylindrical test piece obtained in step (2) above to shrink it so that it can be placed in a sealed container;

[0038] (3) Only the cross-sections at both ends of the cylindrical specimen are left exposed. The dried cylindrical specimen is placed in a sealed container, and a bamboo wood swelling agent is appropriately added to allow the volume of the bamboo wood swelling agent to expand and adhere tightly to the sealed container, thereby achieving a side seal on the cylindrical specimen. Alternatively, other shrinkable materials other than the bamboo wood swelling agent that are not corroded by the reaction solution may be used to seal the sides of the cylindrical specimen, such as adhesive tape, heat shrink tubing, or other shrinkable materials.

[0039] (4) Connect the pipe to the cross sections of the cylindrical specimen sealed in step (3) above, and connect the pipe to the propeller, as shown in the following example. Figure 1 As shown;

[0040] (5) The reaction liquid is then introduced into the interior of the cylindrical specimen through the pipe and the cross sections of both ends of the cylindrical specimen using a propeller;

[0041] (6) The cylindrical specimen is placed in a special external field and the liquid is continuously circulated to achieve uniform and efficient treatment of the cell wall components of the large-volume cylindrical specimen; wherein the special external field includes a thermal field (heating), a magnetic field (external magnetic field effect) and a cold field (low temperature environment);

[0042] (7) The reaction liquid is replaced with a washing liquid, and the washing liquid is input into the cylindrical specimen through a pipeline using a propeller and continuously circulated inside the cylindrical specimen to remove the reaction liquid inside the cylindrical specimen, such as Figure 2 As shown;

[0043] (8) The washing liquid is then replaced with bamboo wood shrinkage liquid, which is then introduced into the cylindrical specimen through a pipe using a propeller and continuously circulated inside the cylindrical specimen, causing the volume of the cylindrical specimen to shrink slightly, and then the final cylindrical specimen is taken out.

[0044] The diameter of the cylindrical test piece is 1 mm to 500 mm, and the length is 1 cm to 200 cm.

[0045] The test piece in step (2) above needs to be dried before being placed in the container. The drying conditions are: drying temperature 60°C to 105°C, drying time 1h to 48h, and the final moisture content after drying is 0% to 10%.

[0046] The bamboo wood swelling agent used can be water, dimethyl sulfoxide, ammonia water, etc.; water is preferred.

[0047] In the above step (3), when shrinkable materials such as tape and heat shrink tubing are used to seal the sides of the sample, it must be ensured that the reaction solution does not corrode the tape and heat shrink tubing, thereby reducing the sealing performance.

[0048] The liquid circulation rate is adapted to the difficulty of longitudinal penetration and the size of the bamboo wood's cross-section. For example, balsa wood is easily permeable, and the reaction liquid circulation rate for a 10cm diameter balsa wood is 20mL / min to 50mL / min. Beech wood is difficult to penetrate, and the reaction liquid circulation rate for a 5cm diameter beech wood is 5mL / min to 15mL / min. Moso bamboo is difficult to penetrate, and the reaction liquid circulation rate for a 1cm diameter moso bamboo wood is 1mL / min to 5mL / min.

[0049] The reaction solution can be any one of a NaOH+Na2SO3 solution, a NaOH+Na2S solution, a NaOH solution, a sodium perchlorate+acetic acid solution, a hydrogen peroxide+sodium hydroxide solution, and a peracetic acid+sodium hydroxide solution. Among them, a NaOH+Na2SO3 solution can remove most of the lignin, hemicellulose, and a small amount of cellulose; a NaOH+Na2S solution can remove most of the lignin, hemicellulose, and a small amount of cellulose; a NaOH solution can remove most of the lignin, hemicellulose, and a small amount of cellulose; a sodium perchlorate+acetic acid solution only removes lignin; a hydrogen peroxide+sodium hydroxide solution can remove some of the lignin and some of the hemicellulose; and a peracetic acid+sodium hydroxide solution can remove most of the lignin and a small amount of hemicellulose.

[0050] The washing liquid used in the above step (7) can be water, benzyl alcohol, ethyl acetate or other washing solvents; in this embodiment, water is preferably used as the washing liquid.

[0051] The bamboo wood shrinkage liquid used in the above step (8) can be a low swelling solvent such as ethanol, methanol, acetone, etc.; in this embodiment, ethanol is preferably used as the bamboo wood shrinkage liquid.

[0052] This embodiment adopts Figure 1 and Figure 2 The device is used, and the reaction liquid is sodium perchlorate + acetic acid; the special external field is a heating field of an 80°C water bath, the reaction time is 48 hours; the washing liquid is water; the bamboo wood shrinkage liquid is ethanol; and the result is as follows: Figure 3 In the sample shown, you can see that the color of the inner and outer layers of the treated wood are consistent.

[0053] In addition to the heating field, the special external field of the present invention can also select other special external fields such as a cold field and a magnetic field according to the needs of the reaction liquid.

[0054] Comparative Example: Figure 3 The traditional soaking treatment method was used, and the reaction solution was sodium perchlorate + acetic acid solution; the reaction was heated in a water bath at 80°C for 48 hours; the following was obtained: Figure 4 In the sample shown, we can see that the traditional method of removing lignin from wood removes the surface layer but does not process the center layer.

[0055] The present invention can achieve uniform regulation of cell wall components and structure of large-volume block bamboo wood, can achieve efficient removal of reaction liquid and by-products from the interior of the bamboo wood, and achieve no impurity residue in the treated test piece.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood, characterized in that: The steps include: (1) Process the bamboo wood into a cylindrical specimen with smooth sides; (2) drying the cylindrical test piece obtained in the above step (2) to shrink it; (3) firstly placing the cylindrical test piece dried in step (2) above into a sealed container, and then sealing the sides of the cylindrical test piece, leaving only the cross sections of the two ends exposed; (4) connecting the pipe to the cross-sections of both ends of the cylindrical test piece sealed in step (3) above, and connecting the pipe to the propeller; (5) using a propeller to pass the reaction liquid through the pipe and the cross sections at both ends of the cylindrical specimen and then input it into the interior of the cylindrical specimen; (6) placing the cylindrical specimen in a special external field and using a propeller to pass the reaction solution through a pipeline into the cylindrical specimen for continuous circulation, thereby achieving uniform and efficient treatment of the cell wall components of the cylindrical specimen; (7) replacing the reaction liquid with a washing liquid, and using a propeller to input the washing liquid into the cylindrical specimen through a pipeline and continuously circulate it in the cylindrical specimen to remove the reaction liquid in the cylindrical specimen; (8) The washing liquid is then replaced with bamboo wood shrinkage liquid, and the bamboo wood shrinkage liquid is introduced into the cylindrical specimen through a pipeline using a propeller and continuously circulated in the cylindrical specimen, so that the volume of the cylindrical specimen is slightly shrunk, and then the final cylindrical specimen is taken out.

2. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: The cylindrical test piece has a diameter of 1 mm to 500 mm and a length of 1 cm to 200 cm.

3. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: The drying conditions of the cylindrical test piece in step (2) are as follows: drying temperature of 60° C. to 105° C., drying time of 1 h to 48 h, and final moisture content after drying of 0% to 10%.

4. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: The step (3) is to place the dried and sealed cylindrical test piece into a sealed container, and then introduce a bamboo wood swelling agent, so that the volume of the bamboo wood swelling agent expands and fits tightly against the sealed container, thereby sealing the side of the cylindrical test piece.

5. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 4, characterized in that: The bamboo wood swelling agent is water.

6. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: In step (3), other shrinkable substances other than the bamboo wood swelling agent and not corroded by the reaction solution may be used to seal the sides of the cylindrical test piece.

7. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: The reaction solution can be any one of NaOH+Na2SO3 solution, NaOH+Na2S solution, NaOH solution, sodium perchlorate+acetic acid solution, hydrogen peroxide+sodium hydroxide solution, and peracetic acid+sodium hydroxide solution.

8. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: The special external field in step (6) can be any one of a heating field, a magnetic field and a cooling field.

9. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: The washing liquid in step (7) is water.

10. The method for uniformly and efficiently regulating the cell wall components and structures of large-volume block bamboo wood as claimed in claim 1, characterized in that: The bamboo wood shrinkage liquid in step (8) is ethanol.

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