Glue-free gluing enhanced bamboo laminated wood material as well as preparation method and application thereof

Abstract

The invention discloses a glue-free gluing enhanced bamboo laminated wood material, a preparation method and application, and belongs to the technical field of bamboo material bonding. The glue-free gluing enhanced bamboo laminated wood material comprises a plurality of layers of modified bamboo materials which are glued in a hot pressing mode. Regenerated lignin containing amino and carboxyl functional groups is deposited on the surface and / or inside the modified bamboo wood; the regenerated lignin is formed by dissolving and modifying enzymatic hydrolysis lignin through a deep-eutectic solvent and then performing water-induced regeneration deposition; the eutectic solvent is prepared from formic acid, L-lysine and 1, 4-butanediol.

Description

Technical Field

[0001] This invention relates to the field of bamboo material bonding technology, specifically to a glue-free reinforced bamboo laminated timber material, its preparation method, and its application. Background Technology

[0002] Bamboo, as a widely distributed, rapidly growing, and highly renewable biomass resource, possesses excellent mechanical properties and significant carbon sequestration capabilities. Under the "dual-carbon" strategy, bamboo products, as green alternatives to traditional wood and energy-intensive building materials, demonstrate enormous application potential in structural engineering. However, natural bamboo suffers from inherent defects such as thin walls and hollow structures, large taper, and uneven node distribution, and the raw bamboo has a relatively narrow width, severely limiting its direct industrial application. To overcome these defects, bamboo is typically processed into units, which are then reassembled using adhesives to create engineered structural materials such as bamboo laminated timber and reconstituted bamboo.

[0003] Currently, phenolic resin is widely used in the manufacture of bamboo structural materials due to its high bonding strength and good water resistance. However, this type of traditional synthetic resin adhesive has serious drawbacks: on the one hand, its raw materials come from non-renewable petrochemical resources, resulting in high energy consumption and large carbon emissions during production; on the other hand, it continuously releases harmful volatile substances such as formaldehyde during use, seriously endangering human health and polluting the environment. Therefore, developing green bonding technologies that do not rely on fossil resources and release no formaldehyde, achieving "glue-free bonding" or "self-bonding" of bamboo, has become a key technical challenge that urgently needs to be solved in the field of biomass materials.

[0004] In recent years, inspired by the strong adhesion of marine mussels to substrates such as rocks and metals in humid environments, researchers have discovered that the core adhesive component is 3,4-dihydroxyphenylalanine (DOPA). The catechol groups in the DOPA molecule can be oxidized to form quinone structures, creating coordinate bonds, hydrogen bonds, and π-π stacking with the substrate. Simultaneously, the amino and carboxyl groups in its structure can significantly enhance interfacial adhesion properties through synergistic effects. Lignin, as a major chemical component of bamboo, possesses a similar benzene ring skeleton and polyphenol structure to DOPA, demonstrating its natural potential for conversion into bio-adhesives.

[0005] However, natural lignin has low reactivity and is difficult to utilize directly. Eutectic solvents (DES), as an emerging green solvent, can effectively dissolve and modify lignin. While existing carboxylic acid-based DES can effectively cleave lignin, they easily induce condensation reactions in lignin under acidic and high-temperature environments. This condensation structure reduces the reactivity of lignin, hindering its subsequent use as an adhesive. Studies have shown that appropriately introducing polyols into the solvent system can act as "condensation inhibitors," effectively preventing the ineffective condensation of lignin fragments. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a eutectic solvent system for treating bamboo, constructed from formic acid, L-lysine, and 1,4-butanediol, consisting of a tricarboxylic acid-amino acid-alcohol mixture. This method aims to inhibit lignin condensation using 1,4-butanediol while simultaneously introducing amino and carboxyl groups into the lignin molecule using L-lysine, modifying it into a regenerated lignin rich in active groups and mimicking the DOPA structure. Water is used as an antisolvent to induce the deposition of this modified lignin on the bamboo surface. This not only increases the surface roughness of the bamboo but also leverages the hydrogen bonds, covalent bonds, and physical entanglement generated by the modified lignin itself to achieve high-strength, water-resistant, and glue-free bonding of the bamboo during hot pressing. This completely solves the problems of dependence on petrochemical adhesives and formaldehyde release in traditional bamboo engineered wood products.

[0007] A first aspect of the present invention relates to a glue-free reinforced bamboo laminated timber material, comprising multiple layers of modified bamboo bonded by hot pressing; wherein the surface and / or interior of the modified bamboo are deposited with regenerated lignin containing amino and carboxyl functional groups; wherein the regenerated lignin is formed by water-induced regeneration deposition after enzymatic hydrolysis of lignin by dissolution and modification in a eutectic solvent; wherein the eutectic solvent includes formic acid, L-lysine and 1,4-butanediol.

[0008] Optionally, in the eutectic solvent, the molar ratio of formic acid, L-lysine, and 1,4-butanediol is 5:1:4.

[0009] Optionally, the mass ratio of the enzymatically hydrolyzed lignin to the eutectic solvent is (4-16):100, and the enzymatically hydrolyzed lignin is enzymatically hydrolyzed lignin derived from corn cobs.

[0010] Optionally, the dry shear strength of the bamboo laminated timber material is greater than or equal to 2.76 MPa, and the wet shear strength is greater than or equal to 1.46 MPa.

[0011] A second aspect of the present invention relates to a method for preparing the above-mentioned glue-free reinforced bamboo laminated timber material, comprising the following steps: (1) Mix formic acid, L-lysine and 1,4-butanediol and heat to obtain solution A; add enzymatically hydrolyzed lignin to solution A and dissolve to obtain solution B; (2) The bamboo blocks were immersed in solution B and heated. After the immersion was completed, deionized water was added to the system and stirred to induce lignin regeneration and deposition. The bamboo blocks were taken out, washed and dried to obtain modified bamboo. (3) The modified bamboo preform is placed in a hot press and hot-pressed to obtain the glue-free reinforced bamboo laminated material.

[0012] Optionally, in step (1), the molar ratio of formic acid, L-lysine, and 1,4-butanediol is 5:1:4; the mixing and heating temperature is 60°C and the time is 60 min.

[0013] Optionally, in step (1), the mass ratio of solution A to enzymatically hydrolyzed lignin is 100:(4-16); the dissolution temperature is 120℃ and the time is 40-180 min.

[0014] Optionally, in step (2), the impregnation treatment temperature is 110°C and the treatment time is 20 min; the volume ratio of deionized water to solution B is (10-12):1; and the stirring time is 2 h.

[0015] Optionally, in step (3), the hot pressing temperature is 160°C, the pressure is 2 MPa, and the time is 15 min; before the assembly, deionized water is sprayed onto the surface of the modified bamboo.

[0016] A third aspect of the present invention relates to the application of the above-mentioned glue-free reinforced bamboo laminated timber material as a raw material in the fields of furniture manufacturing, interior decoration, vehicle interiors, or packaging materials.

[0017] The beneficial effects of this invention are: 1. This invention utilizes a eutectic solvent system constructed from formic acid, L-lysine, and 1,4-butanediol to treat bamboo. Based on the principle of "lignin priority," this system can not only efficiently dissolve exogenous enzymatically hydrolyzed lignin but also activate the native lignin on the surface of bamboo. By adding antisolvent water to induce the self-assembly of dissolved lignin, the micro-nano rough surface of bamboo loaded with regenerated lignin is reconstructed. This rough structure significantly increases the bonding specific surface area. At the same time, the adhesive ability of lignin at high temperatures is used to directly hot-press the modified bamboo to obtain high-strength and stable bamboo-based engineering materials.

[0018] 2. This invention utilizes the synergistic design of DES components to modify the lignin molecular backbone with functional groups such as amino and carboxyl groups using L-lysine during dissolution and regeneration. Simultaneously, 1,4-butanediol is used as an inhibitor to effectively block the condensation reaction of lignin in an acidic environment, thus preserving the high phenolic hydroxyl content and low molecular weight characteristics of lignin. This regenerated lignin, rich in active groups, has a highly reactive structure similar to mussel protein DOPA, and can form high-density hydrogen bonds and covalent bonds during hot pressing, thereby achieving strong chemical bonding between bamboo laminated timber units without the addition of external adhesives.

[0019] 3. The glue-free bamboo laminated timber prepared by this invention has excellent water resistance and mechanical strength. The dry shear strength of the material is about 4.0 MPa and the wet shear strength is about 3.0 MPa.

[0020] 4. The preparation process used in this invention is green and environmentally friendly. The DES solvent component used has good biocompatibility and recyclability. No phenolic, urea-formaldehyde or other formaldehyde-containing resins are added during the entire preparation process, which solves the problem of free formaldehyde release in the actual application of bamboo engineered wood.

[0021] 5. The method adopted in this invention realizes the high-value utilization of enzymatically hydrolyzed lignin and the recycling of solvents, which meets the requirements of green chemistry and sustainable development, and provides a low-carbon and efficient new path for the bamboo deep processing industry. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0023] Unless otherwise specified, the experimental methods used in the following examples are all conventional operating methods.

[0024] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0025] The enzymatically hydrolyzed lignin used in the following embodiments of this application was purchased from Shandong Longli Biotechnology Co., Ltd., and was derived from corn cobs.

[0026] A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix formic acid, L-lysine, and 1,4-butanediol, heat and stir until the solution is clear to obtain solution A; add enzymatically hydrolyzed lignin to solution A and stir until completely dissolved to obtain solution B; in step S1, the molar ratio of formic acid, L-lysine, and 1,4-butanediol in solution A is 5:1:4, the heating temperature is 60℃, and the stirring time is 60 min; in step S1, the mass ratio of solution A to enzymatic lignin in solution B is 100:(4-16), the dissolution temperature is 120℃, and the stirring time is 40-180 min. S2. Place the bamboo blocks in solution B and heat to soak them. After soaking, turn off the heating, add deionized water, and stir. Take out the treated bamboo blocks, wash them with deionized water, and dry them to obtain modified bamboo. The soaking temperature of the bamboo blocks in step S2 is 110℃, and the soaking time is 20min. The volume ratio of deionized water to solution B in step S2 is (10-12):1, and the magnetic stirring time is 2h. The bamboo blocks in step S2 are washed with deionized water 3-5 times and dried in an oven at 60℃ to obtain modified bamboo.

[0027] S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo to form a block; place the block into a hot press and hot press to obtain a glue-free reinforced bamboo laminated material; during hot pressing, the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0028] Specific embodiments and comparative examples are given below.

[0029] Example 1 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid, 58 g L-lysine and 144 g 1,4-butanediol, heat to 60°C and stir until the solution is clear to obtain solution A; add 12 g enzymatically hydrolyzed lignin to solution A and stir at 120°C for 40 min until completely dissolved to obtain solution B; S2. Place the bamboo blocks in solution B and heat to 110℃ for 20 minutes for soaking. After soaking, turn off the heating and add deionized water. The volume ratio of deionized water to solution B is 12 times. Stir the mixture. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0030] The mechanical properties of the double-layer bamboo laminated timber were tested; the mechanical property indicators of the obtained double-layer bamboo laminated timber are shown in Table 1.

[0031] Example 2 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid, 58 g L-lysine and 144 g 1,4-butanediol, heat to 60°C and stir until the solution is clear to obtain solution A; add 24 g of enzymatically hydrolyzed lignin to solution A and stir at 120°C for 80 min until completely dissolved to obtain solution B; S2. Place the bamboo blocks in solution B and heat to 110℃ for 20 minutes for soaking. After soaking, turn off the heating and add deionized water. The volume ratio of deionized water to solution B is 12 times. Stir the mixture. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0032] The mechanical properties of the obtained double-layer bamboo laminated timber are shown in Table 1.

[0033] Example 3 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid, 58 g L-lysine and 144 g 1,4-butanediol, heat to 60°C and stir until the solution is clear to obtain solution A; add 36 g of enzymatically hydrolyzed lignin to solution A and stir at 120°C for 120 min until completely dissolved to obtain solution B. S2. Place the bamboo blocks in solution B and heat to 110℃ for 20 minutes for soaking. After soaking, turn off the heating and add deionized water. The volume ratio of deionized water to solution B is 12 times. Stir the mixture. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0034] The mechanical properties of the obtained double-layer bamboo laminated timber are shown in Table 1.

[0035] Example 4 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid, 58 g L-lysine and 144 g 1,4-butanediol, heat to 60°C and stir until the solution is clear to obtain solution A; add 48 g enzymatically hydrolyzed lignin to solution A and stir at 120°C for 180 min until completely dissolved to obtain solution B. S2. Place the bamboo blocks in solution B and heat to 110℃ for 20 minutes for soaking. After soaking, turn off the heating and add deionized water. The volume ratio of deionized water to solution B is 12 times. Stir the mixture. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0036] The mechanical properties of the obtained double-layer bamboo laminated timber are shown in Table 1.

[0037] Comparative Example 1 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid, 58 g L-lysine and 144 g 1,4-butanediol, heat to 60°C and stir until the solution is clear to obtain solution A; S2. Place the bamboo blocks into solution A and heat it to 110℃ for 20 minutes. After immersion, turn off the heating and add deionized water. The volume ratio of deionized water to solution A is 12 times. Stir the solution. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0038] The bonding strength of the obtained double-layer bamboo laminated timber is shown in Table 1.

[0039] Comparative Example 2 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid and 58 g L-lysine, heat to 60°C and stir until the solution is clear to obtain solution A; S2. Place the bamboo blocks into solution A and heat it to 110℃ for 20 minutes. After immersion, turn off the heating and add deionized water. The volume ratio of deionized water to solution A is 12 times. Stir the solution. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0040] The bonding strength of the obtained double-layer bamboo laminated timber is shown in Table 1.

[0041] Comparative Example 3 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid and 144 g 1,4-butanediol, heat to 60°C and stir until the solution is clear to obtain solution A; S2. Place the bamboo blocks into solution A and heat it to 110℃ for 20 minutes. After immersion, turn off the heating and add deionized water. The volume ratio of deionized water to solution A is 12 times. Stir the solution. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0042] The bonding strength of the obtained double-layer bamboo laminated timber is shown in Table 1.

[0043] Comparative Example 4 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid and 58 g L-lysine, heat to 60°C and stir until the solution is clear to obtain solution A; add 18 g of enzymatically hydrolyzed lignin to solution A and stir at 120°C for 180 min until completely dissolved to obtain solution B; S2. Place the bamboo blocks in solution B and heat to 110℃ for 20 minutes for soaking. After soaking, turn off the heating and add deionized water. The volume ratio of deionized water to solution B is 12 times. Stir the mixture. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0044] The bonding strength of the obtained double-layer bamboo laminated timber is shown in Table 1.

[0045] Comparative Example 5 A method for preparing a glue-free reinforced bamboo laminated timber material, the method comprising the following steps: S1. Mix 92 g formic acid and 144 g 1,4-butanediol, heat to 60°C and stir until the solution is clear to obtain solution A; add 28 g of enzymatically hydrolyzed lignin to solution A and stir at 120°C for 180 min until completely dissolved to obtain solution B; S2. Place the bamboo blocks in solution B and heat to 110℃ for 20 minutes for soaking. After soaking, turn off the heating and add deionized water. The volume ratio of deionized water to solution B is 12 times. Stir the mixture. Take out the treated bamboo blocks, wash them with deionized water and dry them to obtain the modified bamboo. S3. Spray a layer of deionized water evenly onto the surface of the modified bamboo and assemble the bamboo blocks; place the assembled bamboo blocks into a hot press and hot press to obtain glue-free reinforced bamboo laminated timber; the hot pressing temperature is 160℃, the hot pressing pressure is 2MPa, and the hot pressing time is 15min.

[0046] The bonding strength of the obtained double-layer bamboo laminated timber is shown in Table 1.

[0047] Table 1: Sample Test Results Note: The "-" in Comparative Examples 2, 3, and 5 indicates that the same test as the example was performed but the strength data could not be measured.

[0048] The bamboo blocks are 100mm×25mm×6mm in size. They are hot-pressed at 160℃ and 2 MPa for 15 min. After hot pressing according to GB / T17657-2013, grooves are cut and the glued area is 25×25 mm². Then, they are stored at room temperature for 24 h to eliminate internal stress.

[0049] Experiments have shown that the glue-free reinforced bamboo laminated timber method described in this invention, which utilizes modified enzymatic hydrolysis of lignin to reinforce bamboo laminated timber, is a green, simple, and efficient method for modifying the surface of bamboo, and can thereby obtain high-strength and stable bamboo-based engineering materials.

[0050] The present invention has been described in detail above with general descriptions and specific embodiments. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention. In particular, the method is applicable to the reinforcement of materials such as bamboo, wood, straw, bagasse, reed stalks, and similar biomass resources. All materials involving the reinforcement of bamboo, wood, straw, bagasse, reed stalks, and similar biomass resources using this method are subject to protection.

[0051] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A type of glue-free reinforced bamboo laminated timber material, characterized in that, The invention comprises multilayered modified bamboo bonded by hot pressing; the surface and / or interior of the modified bamboo are deposited with regenerated lignin containing amino and carboxyl functional groups; the regenerated lignin is formed by water-induced regeneration deposition after enzymatic hydrolysis of lignin by dissolution and modification in a eutectic solvent; the eutectic solvent includes formic acid, L-lysine and 1,4-butanediol.

2. The glue-free reinforced bamboo laminated timber material according to claim 1, characterized in that, In the eutectic solvent, the molar ratio of formic acid, L-lysine, and 1,4-butanediol is 5:1:

4.

3. The glue-free reinforced bamboo laminated timber material according to claim 1, characterized in that, The mass ratio of the enzymatically hydrolyzed lignin to the eutectic solvent is (4-16):100, and the enzymatically hydrolyzed lignin is enzymatically hydrolyzed lignin derived from corn cobs.

4. The glue-free reinforced bamboo laminated timber material according to claim 1, characterized in that, The dry shear strength of the bamboo laminated timber is greater than or equal to 2.76 MPa, and the wet shear strength is greater than or equal to 1.46 MPa.

5. A method for preparing the glue-free reinforced bamboo laminated timber material according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Mix formic acid, L-lysine and 1,4-butanediol and heat to obtain solution A; The enzymatically hydrolyzed lignin was added to solution A and dissolved to obtain solution B; (2) The bamboo blocks were immersed in solution B and heated. After the immersion was completed, deionized water was added to the system and stirred to induce lignin regeneration and deposition. The bamboo blocks were taken out, washed and dried to obtain modified bamboo. (3) The modified bamboo preform is placed in a hot press and hot-pressed to obtain the glue-free reinforced bamboo laminated material.

6. The preparation method according to claim 5, characterized in that, In step (1), the molar ratio of formic acid, L-lysine, and 1,4-butanediol is 5:1:4; the mixing and heating temperature is 60°C and the time is 60 min.

7. The preparation method according to claim 5, characterized in that, In step (1), the mass ratio of solution A to enzymatically hydrolyzed lignin is 100:(4-16); the dissolution temperature is 120℃ and the time is 40-180 min.

8. The preparation method according to claim 5, characterized in that, In step (2), the impregnation treatment temperature is 110℃ and the treatment time is 20 min; the volume ratio of deionized water to solution B is (10-12):1; and the stirring time is 2 h.

9. The preparation method according to claim 5, characterized in that, In step (3), the hot pressing temperature is 160℃, the pressure is 2 MPa, and the time is 15 min; before the assembly, deionized water is sprayed onto the surface of the modified bamboo.

10. The use of the glue-free reinforced bamboo laminated timber material according to any one of claims 1-4 as a raw material in the fields of furniture manufacturing, interior decoration, vehicle interior or packaging materials.

Images