Anti-bending and anti-fracture bamboo-wood louver blade and preparation process thereof

Abstract

The invention discloses an anti-bending and anti-fracture bamboo louver blade and a preparation process thereof, and belongs to the field of building decoration materials. In order to solve the problems that a traditional bamboo louver blade is prone to breakage and bending failure due to the fact that bamboo wood is low in cross grain strength and high in hygroscopicity, performance breakthrough is achieved through multi-dimensional synergistic modification. The preparation process comprises the following steps: selecting bamboo wood of 3-5 years old, cutting the bamboo wood, performing ultrasonic cleaning with sodium carbonate, treating linen fibers with acetic acid and a silane coupling agent, performing vacuum permeation and plastification with a glycerol-citric acid solution, constructing a bamboo wood-fibrofelt-bamboo wood three-layer composite structure, performing hot-pressing curing, and performing gradient drying, low-temperature circulation and beeswax-nano silicon dioxide coating edge sealing. Experiments show that the louver blade can resist bending for 5200 times, the elongation at break is 8.2%, the bending strength is 140 MPa, and the impact strength is 65 kJ / m < 2 >. Compared with a single reinforcing process of resin impregnation or recombined fibers, the bending fatigue resistance is improved by 32.7%-46.2% through cooperation of plasticizing modification, a laminated structure and surface protection, and the method is suitable for high-end building decoration scenes.

Description

Technical Field

[0001] This invention belongs to the field of building decoration materials, and in particular relates to a bamboo and wood louver that is resistant to bending and breakage and its preparation process. Background Technology

[0002] Bamboo and wood louvers are widely used in architectural decoration due to their natural beautiful texture, lightweight and environmentally friendly properties. However, traditional bamboo and wood louvers are mostly made by directly processing a single layer of bamboo strips. Limited by the inherent characteristics of bamboo, they have significant performance shortcomings. While the tensile strength of bamboo along the grain can reach 150-200 MPa, its strength across the grain is only 1 / 10-1 / 20 of that, and it naturally contains defects such as knots and uneven fiber distribution. When louvers are frequently bent during use, micro-cracks easily form in the transverse direction due to stress concentration, leading to breakage and failure. Experimental data shows that louvers made from unmodified bamboo strips develop obvious cracks after 1000 bends, and the crack propagation rate accelerates by more than 30% in humid environments, seriously affecting service life. Furthermore, bamboo is highly hygroscopic; its moisture content can change by up to 12% in environments with fluctuating humidity, causing a 3-5% dimensional expansion rate, leading to internal stress accumulation and adhesive interface delamination, further exacerbating the risk of interlayer cracking. Traditional resin impregnation processes can only withstand 2800-3100 bending cycles and the fracture is brittle. In contrast, the existing bamboo and wood louvers have a moisture content change of more than 12% and an expansion rate of 5% under fluctuating humidity conditions.

[0003] To address the aforementioned issues, existing technologies primarily improve upon the problem through simple surface treatments or single-layer structural optimization, but fail to provide a systematic solution. Traditional processes only employ conventional cleaning to remove impurities from the bamboo surface without activating the fiber surface. This results in an interfacial shear strength of only 1.5-2.0 MPa between the adhesive and the bamboo matrix, failing to effectively transfer stress. The drying process often uses a single temperature without controlling the humidity gradient, easily leading to internal stress concentration and the formation of hidden cracks due to uneven drying rates. In terms of structural design, most products do not incorporate reinforcing composite structures, relying solely on single-layer bamboo strips or simple lamination, offering limited improvement in bending resistance. Edge treatment generally lacks professional protection; right-angle edges easily become stress concentration points, and ineffective isolation from moisture erosion causes the louver edges to absorb water and expand at rates exceeding 10% in high-humidity environments, accelerating delamination and breakage. Furthermore, existing resin impregnation methods do not solve the problem of interlayer stress concentration.

[0004] Therefore, there is an urgent need for a systematic preparation process that includes material pretreatment, composite structure construction and surface protection, in order to solve the technical problems of traditional bamboo and wood louvers being easy to bend and break, and to meet the demand for high-performance green building materials in the high-end building decoration field. Summary of the Invention

[0005] To solve the problem that bamboo and wood louvers are prone to bending and breakage.

[0006] To address the above problems, the present invention provides the following technical solution:

[0007] A type of bamboo and wood louver that is resistant to bending and breakage, comprising the following components:

[0008] Spraying materials: 0.5-1 parts food-grade sodium bicarbonate, 5-10 parts acetic acid solution, 3-5 parts silane coupling agent, 3-5 parts glycerin, 0.1-0.5 parts citric acid, 15-20 parts polyurethane adhesive, 0.5-1 parts nano silica, 1-2 parts polyvinyl alcohol, and 1-2 parts silicone adhesive.

[0009] Base materials: bamboo, flax fiber, natural fiber felt

[0010] Preferably, the silane coupling agent is KH-550.

[0011] Preferably, the bamboo material is selected from 3-5 year old moso bamboo or nan bamboo, with uniform material and no insect infestation.

[0012] Preferably, the flax fiber is bast fiber extracted from the stem of the flax plant, and its main component is cellulose.

[0013] Preferably, the natural fiber felt is a nonwoven material made of a mixture of various natural fibers and adhesives, and its main component is straw fiber.

[0014] A process for preparing bamboo and wood louvers that are resistant to bending and breakage includes the following steps:

[0015] S1: Select bamboo with a growth period of 3-5 years, cut initial thin slices along the grain direction, and place the thin slices in deionized water at 50-60℃ with 0.5-1% food-grade sodium carbonate for ultrasonic cleaning for 15-20 minutes.

[0016] S2: Soak flax fibers in a 5% acetic acid solution for 30 minutes, wash and dry them, then soak them in a 5% KH-550 ethanol solution of silane coupling agent for 10 minutes, and dry them for later use.

[0017] S3: Prepare a glycerol-water mixed solution with a mass ratio of glycerol:water = 1:2, then add 0.2% citric acid, and then completely immerse the bamboo and wood.

[0018] S4: It adopts a three-layer composite structure of bamboo-fiber felt-bamboo. First, a layer of water-based polyurethane gel is coated on the surface of bamboo, then a layer of pre-treated natural fiber felt is laid, and then another layer of bamboo is covered.

[0019] S5: Place the composite bamboo strips into a hot press to cure the adhesive and tightly bond the fibers to the bamboo and wood matrix;

[0020] S6: Place the hot-pressed sheet into a constant temperature and humidity chamber for gradient drying. After drying, place the sheet at room temperature for one day, and then place the product in a -10℃ environment for 2 hours. Repeat this process twice.

[0021] S7: Use fine sandpaper to round the edges of the louvers, then wipe the surface with beeswax. Finally, spray the louvers with an aqueous dispersion containing 1% polyvinyl alcohol and 0.5% nano silica, and dry them. Finally, cut the edges of the louvers to the design size and seal them with 0.3-0.5mm thick silicone sealant.

[0022] Preferably, in S1, an initial sheet with a thickness of 0.8-1.2 mm and a width of 25-30 mm is cut.

[0023] Preferably, in S3, the bamboo and wood are immersed in a vacuum at 60-70°C for 2 hours.

[0024] Preferably, the hot press in S5 is set to press for 30 minutes at a temperature of 120°C and a pressure of 2MPa.

[0025] Preferably, in S6, the first stage controls the temperature to 40°C and the humidity to 60% for 12 hours, the second stage controls the temperature to 50°C and the humidity to 40% for 8 hours, and the third stage controls the temperature to 60°C and the humidity to 20% to dry until the moisture content is 8-10%.

[0026] The advantages and effects of the preparation process of the bamboo and wood louver blades that are resistant to bending and breakage according to the present invention:

[0027] 1. This patent uses 3-5 year old bamboo, which has a balanced fiber density and mechanical properties. Cutting along the grain preserves the natural fiber orientation and reduces the risk of breakage along the grain. The 0.8-1.2mm thin design is lightweight, and subsequent processing can improve the interlayer bonding force, avoiding the brittleness caused by insufficient thickness of a single bamboo strip. Sodium carbonate ultrasonic cleaning removes surface grease, wax and impurities, roughens the surface and improves the penetration efficiency of subsequent treatment solutions, laying the foundation for the interface bonding of the composite structure.

[0028] 2. In this patent, after the flax fiber is soaked in acetic acid and treated with silane coupling agent (KH-550), the surface hydroxyl groups are activated, which enhances the chemical compatibility with the bamboo and wood matrix. When used as an intermediate layer, it can effectively transfer stress and inhibit crack propagation. The porous structure of the fiber felt, when combined with bamboo and wood, forms a skeleton that combines rigidity and flexibility, improving the overall bending toughness.

[0029] 3. In this patent, the glycerol-water mixture permeates bamboo and wood under vacuum. Glycerol acts as a plasticizer to reduce the intermolecular forces of cellulose and improve the flexibility of the material. Citric acid regulates the slightly acidic environment, which may promote the partial degradation of hemicellulose in bamboo and wood, improve the internal pore structure, and make the fiber felt and matrix more tightly bonded during subsequent composite processes, and less prone to delamination when bent.

[0030] 4. This patent employs a three-layer structure of bamboo-fiber felt-bamboo, cured by hot pressing with a water-based polyurethane gel adhesive, forming a sandwich structure of matrix-reinforcing phase-matrix: the fiber felt acts as the middle reinforcing layer, dispersing external bending stress, while the upper and lower bamboo layers provide rigid support. Their synergistic effect prevents the material from easily breaking due to localized stress concentration during bending. The hot pressing process ensures full curing of the adhesive, significantly improving interfacial bonding strength.

[0031] 5. This patent uses gradient drying to avoid internal stress cracking caused by uneven drying rate, and precisely controls the moisture content to 8-10%, which not only prevents bamboo and wood from becoming brittle due to excessive dryness, but also avoids mold growth caused by high moisture content. The -10℃ low temperature cycle treatment can promote the densification of the internal microstructure of the material, improve freeze-thaw resistance and weather resistance, adapt to temperature fluctuation environment, and reduce the risk of low temperature brittleness cracking. Attached Figure Description

[0032] Figure 1 This is a flowchart illustrating the preparation process of a bamboo and wood louvered blade that is resistant to bending and breakage, as described in this invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Example 1

[0036] This embodiment provides a manufacturing process for bamboo and wood louvers that are resistant to bending and breakage, applicable to the following implementation details:

[0037] Experimental objective:

[0038] Prepare a bamboo and wood louver blade that is resistant to bending and breakage.

[0039] Experimental materials:

[0040] Base material: bamboo

[0041] Spray coating materials: deionized water, food-grade sodium bicarbonate, flax fiber, acetic acid solution, silane coupling agent, glycerin, citric acid, natural fiber felt, nano silica, polyvinyl alcohol, silicone sealant

[0042] Experimental steps:

[0043] S1: Select bamboo with a growth period of 3-5 years, cut it into initial thin slices with a thickness of 0.8-1.2mm and a width of 25-30mm along the grain direction, and place the thin slices in deionized water at 50-60℃ with 0.5-1% food-grade sodium carbonate for ultrasonic cleaning for 15-20 minutes.

[0044] S2: Soak flax fibers in a 5% acetic acid solution for 30 minutes, wash and dry them, then soak them in a 5% KH-550 ethanol solution of silane coupling agent for 10 minutes, and dry them for later use.

[0045] S3: Prepare a glycerol-water mixed solution with a mass ratio of glycerol:water = 1:2, then add 0.2% citric acid, and then completely immerse the bamboo and wood in a vacuum environment at 60-70℃ for 2 hours;

[0046] S4: It adopts a three-layer composite structure of bamboo-fiber felt-bamboo. First, a layer of water-based polyurethane gel is coated on the surface of bamboo, then a layer of pre-treated natural fiber felt is laid, and then another layer of bamboo is covered.

[0047] S5: Place the composite bamboo strips into a hot press and press them at 120℃ and 2MPa for 30 minutes to cure the adhesive and make the fibers tightly bonded to the bamboo and wood matrix.

[0048] S6: Place the hot-pressed sheet in a constant temperature and humidity chamber for gradient drying. In the first stage, control the temperature at 40℃ and humidity at 60% for 12 hours. In the second stage, control the temperature at 50℃ and humidity at 40% for 8 hours. In the third stage, control the temperature at 60℃ and humidity at 20% until the moisture content is 8-10%. After drying, place the sheet at room temperature for one day, and then place the product in a -10℃ environment for 2 hours. Repeat this process twice.

[0049] S7: Use fine sandpaper to round the edges of the louvers, then wipe the surface with beeswax. Finally, spray the louvers with an aqueous dispersion containing 1% polyvinyl alcohol and 0.5% nano silica, and let them dry. Finally, cut the edges of the louvers to the design dimensions and seal them with silicone sealant.

[0050] Experimental results: See Table 1 for details.

[0051] Table 1: Test Results of Example 1

[0052]

[0053] In Example 1, glycerol penetrates into the gaps between bamboo and wood fibers, reducing intermolecular hydrogen bonding and improving flexibility. Drying the flax fibers in S2 enhances the bond between the fibers and the bamboo / wood. During hot pressing in S5, glycerol further penetrates, enhancing interfacial compatibility. Gradient drying in S6 further releases internal stress through thermal expansion and contraction. The sprayed solution in S7 forms a transparent protective layer of 0.05-0.1 mm after drying, enhancing surface scratch and bending resistance. These steps are not isolated plasticizing processes; plasticizing alone can only increase bending resistance to 3000 cycles, while the composite process in Example 1 achieves bending resistance of up to 5200 cycles.

[0054] Comparative Example 1

[0055] This embodiment provides a method for preparing resin-impregnated modified bamboo and wood to prevent breakage, the details of which are as follows:

[0056] Experimental objective:

[0057] Modified bamboo and wood with anti-crack properties were prepared by resin impregnation.

[0058] Experimental materials:

[0059] Linear phenolic resin, hexamethylenetetramine, epoxy resin, polyamide curing agent, acetone, dibutyl phthalate.

[0060] Experimental steps:

[0061] S1: Boil bamboo strips in deionized water for 30 minutes to remove the extract, dry them, then soak them in anhydrous ethanol for 2 hours to defatt them, and dry them again until the moisture content is <5%;

[0062] S2: Place the bamboo strips into a vacuum tank, add the resin solution, evacuate to -0.09MPa, maintain for 30 minutes, slowly restore to normal pressure, and continue soaking for 1 hour.

[0063] S3: Phenolic resin group: After impregnation, bamboo strips are removed, drained, and placed in an oven for pre-curing at 80℃ for 2 hours and curing at 120℃ for 4 hours. Epoxy resin group: After impregnation, bamboo strips are placed at room temperature for 30 minutes, cured at 60℃ for 2 hours, and then cured at 80℃ for 2 hours.

[0064] Experimental results: See Table 2 for details.

[0065] Table 2: Test Results of Comparative Example 1

[0066]

[0067] This comparative example provides a method for preparing resin-impregnated modified bamboo and wood to prevent breakage. The method involves vacuum impregnation with phenolic / epoxy resin to fill pores and enhance the interface of the bamboo and wood. Specific steps include: degreasing bamboo strips by boiling in deionized water, vacuum impregnation with resin solution, and staged curing. Experimental results show that the phenolic resin group exhibited no breakage after 2800 flexural cycles, with a breaking elongation of 4.8%, a flexural strength of 120 MPa, and an impact strength of 20 kJ / m²; the epoxy resin group exhibited no breakage after 3100 flexural cycles, with a breaking elongation of 5.2%, a flexural strength of 125 MPa, and an impact strength of 22 kJ / m².

[0068] Comparative Example 2

[0069] A method for reinforcing bending resistance with recombinant bamboo and wood fibers is provided, the implementation details of which are as follows:

[0070] Experimental materials:

[0071] Bamboo, phenolic resin, urea-formaldehyde resin, hexamethylenetetramine, ammonium chloride, 5% sodium hydroxide solution, industrial grade

[0072] Experimental objective:

[0073] Recombinant bamboo and wood fiber composites are used to enhance the bending resistance.

[0074] Experimental steps:

[0075] S1: Process bamboo strips into fibers using a pulverizer, pass them through a 40-mesh sieve, immerse them in a 5% sodium hydroxide solution and boil for 1 hour to remove lignin and hemicellulose, rinse with water until neutral, and dry at 80℃ until the moisture content is < 5%;

[0076] S2: Mix dried bamboo fiber with phenolic / urea-formaldehyde resin at a mass ratio of 1:0.3, add the corresponding curing agent, stir evenly, and let stand at room temperature for 30 minutes to allow the resin to fully impregnate the fiber.

[0077] S3: Fill the mold with the mixture and place it in a hot press. Press in two stages: First stage pre-press: 80℃, 0.5MPa pressure for 10 minutes to remove air and preliminarily shape; Second stage hot press: 140℃, 3MPa pressure for 60 minutes / 120℃, 2.5MPa pressure for 40 minutes (urea-formaldehyde resin). Demold after cooling to room temperature.

[0078] Experimental results: See Table 3 for details.

[0079] Table 3: Test Results of Comparative Example 2

[0080]

[0081] This comparative example provides a method for preparing reconstituted bamboo-wood fiber composite reinforcement with bending resistance. The method involves reconstructing the microstructure of bamboo-wood through fiberization treatment and resin composite bonding. Specific steps include: processing bamboo strips into fibers and removing lignin through alkali treatment; mixing the fibers with phenolic / urea-formaldehyde resin at a mass ratio of 1:0.3; and then hot-pressing the mixture. Experimental results show that the sample prepared by this method can withstand 3500 bending cycles without breakage, has a breaking elongation of 5.5%, a parallel-grain bending strength of 135 MPa, and an impact strength of 60 kJ / m².

[0082] Example 1 provides a process for preparing resistant and fracture-resistant bamboo and wood louvers. Through a synergistic design of material pretreatment, composite reinforcement, and surface protection, 3-5 year old bamboo is selected and ultrasonically cleaned with sodium carbonate. This is then combined with pretreated flax fibers to construct a three-layer structure of bamboo-fiber felt-bamboo. This is further enhanced by glycerol-citric acid vacuum plasticization, gradient drying, and low-temperature cycling treatment, and finally sealed with a beeswax-nano silica coating. Experimental data show that the louvers prepared by this process can withstand 5200 bends without breakage, with a breaking elongation of 8.2%, a bending strength of 140 MPa, and an impact strength of 65 kJ / m². These performance characteristics are comprehensively improved compared to traditional bamboo and wood louvers. The core of this process lies in the multi-dimensional optimization of glycerol penetration to reduce cellulose hydrogen bonding, fiber felt stress dispersion, and gradient drying to release internal stress.

[0083] Comparative Example 1 employed a resin impregnation modification process, filling the pores of bamboo with phenolic / epoxy resin through vacuum impregnation. The phenolic group and the epoxy group exhibited bending resistance of 2800 and 3100 cycles, respectively, with elongation at break of 4.8%-5.2%, flexural strength of 120-125 MPa, and impact strength of 20-22 kJ / m. 2 This method relies on single resin filler reinforcement, which improves density but results in high rigidity and insufficient toughness of the cured resin. It also lacks interlayer stress buffering structure, leading to a reduction of more than 40% in flexural fatigue resistance compared to Example 1. Furthermore, without the introduction of plasticizing or surface protection processes, the fracture mode is mainly resin brittle fracture, resulting in limited improvement in overall performance.

[0084] Comparative Example 2 involved recombining bamboo and wood fibers with resin. The bamboo strips were fiberized and then hot-pressed with phenolic / urea-formaldehyde resin. The sample withstood 3500 bending cycles, had an elongation at break of 5.5%, a flexural strength of 135 MPa, and an impact strength of 60 kJ / m. 2 This process significantly enhances cross-stretch strength through isotropic reinforcement via disordered fiber interweaving and dense resin filling. However, it lacks the laminated structure design of Example 1, resulting in insufficient stress dispersion during bending. Furthermore, it is not plasticized, and the material's ductility does not overcome traditional limitations. The number of bending cycles is 32.7% lower than that of Example 1, and the lack of surface protection makes it prone to stress concentration cracking.

[0085] Comparing the three processes, it is evident that both the resin impregnation in Comparative Example 1 and the reconstituted fiber in Comparative Example 2 rely on a single reinforcement mechanism. The former suffers from limited toughness due to the rigidity of the resin, while the latter lacks interlayer buffering due to its homogenized structure. Consequently, their bending resistance and elongation at break are 32.7%-46.2% and 32.9%-41.5% lower than those in Example 1, respectively. In contrast, Example 1, through a multi-dimensional synergy of plasticizing modification to reduce matrix brittleness, fiber felt lamination to disperse stress, gradient drying to release internal stress, and nano-coating to strengthen the surface, not only increased the bending resistance to 5200 cycles but also achieved a shift in the fracture mode from brittle to ductile. Simultaneously, the beeswax coating and silicone sealant edge sealing reduced water absorption by 66.7% and maintained a 92% retention rate of damp heat strength. This comprehensively addresses the shortcomings of traditional bamboo and wood, such as being strong in the longitudinal direction but weak in the transverse direction and being sensitive to environmental factors, thus verifying the significant technical advantages of multi-dimensional synergistic modification in the field of bending resistance and fracture prevention.

[0086] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0087] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0088] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

[0089] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included in the protection of the present invention.

Claims

1. A bending and breaking resistant bamboo shutter blade, characterized in that, The application relates to a bamboo louver, which comprises the following components: Spraying raw materials: 0.5-1 parts of food-grade sodium bicarbonate, 5-10 parts of acetic acid solution, 3-5 parts of silane coupling agent, 3-5 parts of glycerol, 0.1-0.5 parts of citric acid, 15-20 parts of polyurethane glue, 0.5-1 part of nano-silicon dioxide, 1-2 parts of polyvinyl alcohol and 1-2 parts of silicone glue; Base material: bamboo, flax fiber and natural fiber felt.

2. The bamboo shutter blade of claim 1, wherein the bamboo shutter blade is not broken even when the bamboo shutter blade is bent. The silane coupling agent is KH-550.

3. The bamboo and wood louvered blade resistant to bending and breakage as described in claim 1, characterized in that, The bamboo is selected from 3-5 years old Phyllostachys pubescens or Dendrocalamus latiflorus, and is uniform in material quality and free from insect damage.

4. The bamboo shutter blade of claim 1, wherein the bamboo shutter blade is not broken even when it is bent. The flax fiber is bast fiber extracted from the stems of flax plants, and the main component is cellulose.

5. The bamboo shutter blade of claim 1, wherein the bamboo shutter blade is not broken even when the bamboo shutter blade is bent. The natural fiber felt is non-woven material made of various natural fibers and adhesive, and the main component is straw fiber.

6. The preparation process of the bending-resistant and break-proof bamboo shutter blade according to any one of claims 1-5, characterized in that, The application further relates to a preparation method of the bamboo louver, which comprises the following steps: S1: selecting bamboo with a growth age of 3-5 years, cutting initial thin slices along the grain direction, and placing the thin slices in deionized water at 50-60 DEG C and adding 0.5-1% food-grade sodium carbonate for ultrasonic cleaning for 15-20 minutes; S2: immersing the flax fiber in 5% acetic acid solution for 30 minutes, washing and drying, and then immersing in 5% silane coupling agent KH-550 ethanol solution for 10 minutes and drying for standby; S3: preparing a glycerol-water mixed solution with a mass ratio of glycerol to water being 1:2, then adding 0.2% citric acid, and then completely immersing the bamboo wood; S4: adopting a three-layer composite structure of bamboo wood-fiber felt-bamboo wood, coating a layer of water-based polyurethane gel on the surface of the bamboo wood, laying a layer of pretreated natural fiber felt, and then covering another layer of bamboo wood; S5: placing the composite bamboo slice into a hot press to make the adhesive solidify and make the fiber and the bamboo wood matrix tightly combined; S6: placing the hot-pressed slice into a constant-temperature and constant-humidity box for gradient drying, placing the slice at room temperature for one day after the drying is completed, then placing the product in a-10 DEG C environment for 2 hours, and repeating the operation for two times; S7: polishing the edges of the louver blade into round corners by using fine sandpaper, wiping the surface by using beeswax, finally spraying 1% polyvinyl alcohol and 0.5% nano-silicon dioxide water-based dispersion liquid on the louver blade, drying, and finally cutting the edges of the louver blade according to the design size, and further sealing by using 0.3-0.5mm thick silicone glue.

7. The preparation process of the bending-resistant and break-resistant bamboo wood shutter blade according to claim 6, characterized in that, The initial thin slice is cut to have a thickness of 0.8-1.2mm and a width of 25-30mm in S1.

8. The preparation process of the bamboo and wood louver blades resistant to bending and breakage as described in claim 6, characterized in that, The bamboo wood is immersed in a vacuum of-0.08 to-0.09MPa and at a temperature of 60-70 DEG C for 2 hours in S3.

9. The preparation process of the bamboo and wood louver blades resistant to bending and breakage as described in claim 6, characterized in that, The hot press is set to have a temperature of 120 DEG C and a pressure of 2MPa for 30 minutes in S5.

10. The preparation process of the bamboo and wood louver blades resistant to bending and breakage as described in claim 6, characterized in that, The temperature is controlled to be 40 DEG C and the humidity is controlled to be 60% for 12 hours in the first stage, the temperature is controlled to be 50 DEG C and the humidity is controlled to be 40% for 8 hours in the second stage, and the temperature is controlled to be 60 DEG C and the humidity is controlled to be 20% for drying until the water content is 8-10% in the third stage in S6.

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