Method for uniformly and efficiently regulating cell wall components and structure of large-volume block bamboo-wood

Abstract

The application provides a method for uniformly and efficiently regulating cell wall components and structure of large-volume block-shaped bamboo wood, which comprises the following steps: (1) processing bamboo wood into a cylindrical test piece with smooth side surface; (2) drying the cylindrical test piece; (3) placing the cylindrical test piece into a sealed container, then sealing the side surface of the cylindrical test piece, and only leaving two end transverse surfaces exposed; (4) connecting a pipeline with the two end transverse surfaces of the sealed cylindrical test piece, and connecting the pipeline with a propeller; (5) inputting a reaction liquid into the cylindrical test piece through the pipeline by using the propeller; (6) placing the cylindrical test piece into a special external field and continuously circulating the liquid; (7) replacing the reaction liquid with a washing liquid, circulating the washing liquid, and removing the excess reaction liquid; and (8) replacing the washing liquid with a bamboo wood shrinkage liquid, circulating the bamboo wood shrinkage liquid, slightly shrinking the volume of the cylindrical test piece, and then taking out the final cylindrical test piece. The application can realize uniform regulation of cell wall components and structure of large-volume block-shaped bamboo wood, and can realize efficient removal of reaction liquid and by-products from the inside of the bamboo wood.

Description

Technical Field

[0001] This invention relates to the field of bamboo and wood cell wall composition and structure regulation technology, specifically to a method for uniformly and efficiently regulating the cell wall composition and structure of large-volume block bamboo and wood. Background Technology

[0002] In recent years, numerous researchers have shown great interest in developing advanced functional materials based on the regulation of bamboo and wood cell walls. Researchers have successfully developed a series of advanced wood-based functional materials, such as super-strong wood, wood sponge, transparent wood, and photonic wood. By partially or completely removing lignin or hemicellulose from wood, they have achieved various effects, including increasing micropores, exposing cellulose hydroxyl groups, and removing pigment groups, providing a solid foundation for the subsequent functionalization of wood.

[0003] Currently, methods for removing lignin and hemicellulose from bamboo and wood 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 degradation), and biological treatment (including enzyme treatment and bacterial treatment). These methods all require direct contact with the wood components and chemical reactions to achieve degradation and removal of these components.

[0004] However, in existing technologies, chemical agents struggle to penetrate large pieces of wood and bamboo efficiently, hindering the effective treatment of their components. For particularly thick blocks of wood or dense, hard-to-penetrate bamboo, the agents may fail to reach the interior altogether. Even if penetration is achieved, subsequent cleaning processes often fail to remove all byproducts. Furthermore, during treatment, substances typically contact the outer layers first, then slowly penetrate the core layer of the wood or bamboo, resulting in rapid removal of outer cell wall components while the core components degrade slowly. When the core components are finally removed, the outer cellulose may also partially degrade due to the prolonged reaction, creating differences in composition and structure between the outer and core layers. Ultimately, this prevents the uniform removal of wood components and the homogeneous modification of the wood's microstructure. Similar problems exist with light-based and biological treatment methods.

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

[0006] To address the technical problems existing in the background art, the present invention proposes a method for uniformly and efficiently controlling the cell wall composition and structure of large-volume block bamboo and wood, which can achieve uniform control of the cell wall composition and structure of large-volume block bamboo and wood, and can achieve efficient removal of reaction liquid and by-products from the inside of bamboo and wood, so that the treated specimens are free of impurities.

[0007] To address the aforementioned technical problems, this invention provides a method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood, comprising the following steps:

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

[0009] (2) Dry the cylindrical specimen obtained in step (1) and allow it to shrink;

[0010] (3) First, put the cylindrical specimen dried in step (2) into a sealed container, then seal the side of the cylindrical specimen, leaving only the two ends of its cross-section exposed.

[0011] (4) Connect the pipe to the two ends of the cylindrical specimen sealed in step (3) above, and connect the pipe to the pusher;

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

[0013] (6) The cylindrical specimen is placed in a special external field and the reaction liquid is continuously circulated into the cylindrical specimen through a pipeline using a propeller to achieve uniform and efficient treatment of the cell wall components of the cylindrical specimen;

[0014] (7) Replace the reaction solution with a washing solution, and use a propeller to introduce the washing solution into the cylindrical specimen through a pipeline and continuously circulate it inside the cylindrical specimen to remove the reaction solution inside the cylindrical specimen;

[0015] (8) Replace the washing liquid with bamboo and wood shrinkage liquid, use the pusher to input the bamboo and wood shrinkage liquid into the cylindrical specimen through the pipe and continuously circulate inside the cylindrical specimen, so that the volume of the cylindrical specimen shrinks slightly, and then take out the final cylindrical specimen.

[0016] The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume block bamboo and wood, wherein the cylindrical specimen has a diameter of 1mm to 500mm and a length of 1cm to 200cm.

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

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

[0019] The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood, wherein: the bamboo and wood swelling agent is water.

[0020] The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume block bamboo and wood is described in the following step (3): other shrinkable substances other than bamboo and wood swelling agents that are not corroded by the reaction solution are used to seal the cylindrical specimen from the side.

[0021] The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood, wherein: 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, or peracetic acid + sodium hydroxide solution.

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

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

[0024] The method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo and wood, wherein: the bamboo and 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 present invention provides a reasonable and efficient method for uniformly and efficiently controlling the cell wall composition and structure of large-volume block bamboo and wood. It can achieve uniform control of the cell wall composition and structure of large-volume block bamboo and wood, and can efficiently remove reaction liquid and by-products from the inside of bamboo and wood, resulting in no impurity residues in the treated specimens.

[0027] The greatest advantage of this invention is that it solves the problem of uneven treatment of components in large-sized wood and bamboo samples. Current traditional methods mainly remove components by soaking and boiling the wood and bamboo, but this makes it difficult for the reagents to penetrate the interior of large-sized wood and bamboo, thus failing to treat the interior. Other methods have proposed treating wood and bamboo through natural evaporation, but without external force, the reagents have limited effect on long samples, and it cannot remove post-reaction byproducts and reagents. This invention, however, can treat components in large-sized samples while ensuring the removal of reagents after the reaction, leaving no residue. It also achieves consistent treatment effects on the surface and core layers, avoiding the problem of rapid surface reaction and slow core layer reaction found in soaking treatments. Furthermore, this invention uses a circulating reagent penetration method into the interior of the wood and bamboo, requiring less reagent. For the same reaction system, this method uses even less reagent, resulting in lower costs. This invention is applicable to various wood and bamboo component treatment systems, has a wide range of applications, and great potential. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the reaction process involved in the method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood in this invention.

[0030] Figure 2 This is a schematic diagram of the cleaning process involved in the method for uniformly and efficiently regulating the cell wall components and structure of large-volume block bamboo and wood in this invention.

[0031] Figure 3 This image shows a wood sample after 48 hours of traditional soaking treatment, which is part of the method for uniformly and efficiently regulating the cell wall composition and structure of large-volume block bamboo and wood in this invention.

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

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are 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 controlling the cell wall composition and structure of large-volume blocky bamboo and wood, including the following steps:

[0036] (1) Bamboo and wood are shaped into cylindrical specimens with smooth sides to facilitate sealing of the rear sides;

[0037] (2) Dry the cylindrical specimen obtained in step (1) above to allow it to shrink so that it can be placed in a sealed container;

[0038] (3) Only the two ends of the cylindrical specimen are exposed. The dried cylindrical specimen is placed in a sealed container, and an appropriate amount of bamboo and wood swelling agent is added. After the bamboo and wood swelling agent expands in volume, it adheres tightly to the sealed container to achieve a side seal for the cylindrical specimen. Alternatively, other shrinkable materials that are not corroded by the reaction solution, such as tape or heat shrink tubing, can be used to seal the sides of the cylindrical specimen.

[0039] (4) Connect the pipe to the two ends of the cylindrical specimen sealed in step (3) above, and connect the pipe to the pusher, as follows: Figure 1 As shown;

[0040] (5) The reaction liquid is then introduced into the cylindrical specimen through the pipe and the cross-sections at 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 action) and a cold field (low temperature environment);

[0042] (7) Replace the reaction solution with a washing solution, and use a propeller to introduce the washing solution through a pipeline into the cylindrical specimen, where it continuously circulates inside the specimen to remove the reaction solution from inside. Figure 2 As shown;

[0043] (8) Replace the washing liquid with bamboo and wood shrinkage liquid, use the pusher to input the bamboo and wood shrinkage liquid into the cylindrical specimen through the pipe and continuously circulate inside the cylindrical specimen, so that the volume of the cylindrical specimen shrinks slightly, and then take out the final cylindrical specimen.

[0044] The diameter of the cylindrical specimens mentioned above is 1 mm to 500 mm, and the length is 1 cm to 200 cm.

[0045] Before placing the specimens in the container in step (2) above, they need to be dried. The drying conditions are: drying temperature 60℃~105℃, drying time 1h~48h, and the final moisture content after drying is 0%~10%.

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

[0047] In step (3) above, when using shrinkable materials such as tape or heat shrink tubing to seal the sample from the side, it is essential to ensure that the reaction solution does not corrode the tape or heat shrink tubing, thereby reducing the sealing performance.

[0048] The liquid circulation speed should be adapted to the ease of longitudinal penetration of the bamboo or wood, as well as the cross-sectional size. For example, balsa wood is an easily permeable wood, and the flow rate of the reaction liquid for balsa wood with a diameter of 10cm is 20mL / min to 50mL / min. Beech wood is a more difficult-to-penetrate wood, and the flow rate of the reaction liquid for beech wood with a diameter of 5cm is 5mL / min to 15mL / min. Moso bamboo is a difficult-to-penetrate wood, and the flow rate of the reaction liquid for moso bamboo with a diameter of 1cm is 1mL / min to 5mL / min.

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

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

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

[0052] This embodiment uses, as follows: Figure 1 and Figure 2 The apparatus was designed, and the reaction solution was selected as sodium perchlorate + acetic acid; the special external field was an 80℃ water bath heating field, and the reaction time was 48 hours; the washing solution was water; the bamboo and wood shrinkage solution was ethanol; and the following was obtained: Figure 3 The sample shown demonstrates that the treated wood has a consistent color throughout its inner and outer layers.

[0053] In addition to the heating field, the special external field of this invention can also be selected from other special external fields such as the cooling field and the magnetic field, depending on the needs of the reaction liquid.

[0054] Comparative example: Figure 4 The traditional soaking treatment method was adopted, and the reaction solution was selected as sodium perchlorate + acetic acid solution; the reaction was heated in a water bath at 80℃ for 48 hours; the result was as follows. Figure 4 The sample shown demonstrates that traditional methods remove lignin from wood, removing it from the surface layer but failing to treat the core layer.

[0055] This invention can achieve uniform control of cell wall components and structure in large-volume block bamboo and wood, and can efficiently remove reaction liquid and by-products from the inside of bamboo and wood, resulting in no impurities remaining in the treated specimens.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 composition and structure of large-volume blocky bamboo and wood, characterized in that, Includes the following steps: (1) Process bamboo and wood into cylindrical specimens with smooth sides; (2) Dry the cylindrical specimen obtained in step (1) and allow it to shrink; (3) First, put the cylindrical specimen dried in step (2) into a sealed container, then seal the side of the cylindrical specimen, leaving only the two ends of its cross-section exposed. (4) Connect the pipe to the two ends of the cylindrical specimen sealed in step (3) above, and connect the pipe to the pusher; (5) The reaction liquid is then introduced into the cylindrical specimen through the pipe and the cross-sections at both ends of the cylindrical specimen using the propeller; (6) The cylindrical specimen is placed in a special external field and the reaction liquid is continuously circulated into the cylindrical specimen through a pipeline using a propeller to achieve uniform and efficient treatment of the cell wall components of the cylindrical specimen; (7) Replace the reaction solution with a washing solution, and use a propeller to introduce the washing solution into the cylindrical specimen through a pipeline and continuously circulate it inside the cylindrical specimen to remove the reaction solution inside the cylindrical specimen; (8) Replace the washing liquid with bamboo and wood shrinkage liquid, use the pusher to input the bamboo and wood shrinkage liquid into the cylindrical specimen through the pipe and continuously circulate inside the cylindrical specimen, so that the volume of the cylindrical specimen shrinks slightly, and then take out the final cylindrical specimen.

2. The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood as described in claim 1, characterized in that: The cylindrical specimen 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 composition and structure of large-volume blocky bamboo and wood as described in claim 1, characterized in that, The drying conditions for the cylindrical specimen in step (2) are: drying temperature 60℃~105℃, drying time 1h~48h, and final moisture content after drying is 0%~10%.

4. The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood as described in claim 1, characterized in that: Step (3) involves placing the dried and sealed cylindrical specimen into a sealed container, then introducing a bamboo and wood swelling agent to expand the volume of the agent and seal it tightly against the sealed container, thereby achieving a side seal on the cylindrical specimen.

5. The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood as described in claim 4, characterized in that: The swelling agent for bamboo and wood is water.

6. The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood as described in claim 1, characterized in that: In step (3), other shrinkable substances, besides bamboo and wood swelling agents, that are not corroded by the reaction solution are used to seal the sides of the cylindrical specimen.

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

8. The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood as described in claim 1, characterized in that: The special external field in step (6) can be any one of a heating field, a magnetic field, or a cold field.

9. The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood as described in claim 1, characterized in that: The washing solution used in step (7) is water.

10. The method for uniformly and efficiently regulating the cell wall composition and structure of large-volume blocky bamboo and wood as described in claim 1, characterized in that: The bamboo and wood shrinkage liquid in step (8) is made of ethanol.

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