Environment-friendly composite structural member, environment-friendly keyboard and bagasse-based composite board manufacturing method

Abstract

The invention discloses an environment-friendly composite structural member, an environment-friendly keyboard and a bagasse-based composite board manufacturing method, and belongs to the technical field of electronic product structural members. The structural part is fixedly arranged in a stacked mode in the thickness direction and comprises a lower surface layer plate body, a middle supporting frame and an upper surface layer plate body. Wherein the lower surface layer board body and the upper surface layer board body are flat bagasse-based composite boards, the middle supporting frame is of a continuous corrugated paper stacking structure, the concave portion of the middle supporting frame is attached to the top face of the lower surface layer board body, the convex portion of the middle supporting frame is attached to the bottom face of the upper surface layer board body in a matched mode, and an integrated three-layer composite structure is formed. According to the structural part, agricultural waste bagasse serves as a core base material, through the corrugated structure and the laminated fitting design, high-value utilization of resources is achieved, traditional plastic materials are replaced to improve the environmental protection performance, meanwhile, the structural part has the light weight and reliable mechanical supporting performance, and the structural part is suitable for structural bearing parts of various electronic products and has wide application prospects. The green manufacturing and sustainable development concepts are met.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly materials and electronic product structure technology, specifically to an environmentally friendly composite structural component, an environmentally friendly keyboard, and a method for manufacturing a sugarcane bagasse-based composite board. Background Technology

[0002] With the rapid development of the consumer electronics industry, the casings and internal structural components of electronic products are typically made of engineering plastics or metal alloys to meet requirements for strength, durability, and appearance. However, these traditional materials generally suffer from problems such as non-renewability, high energy consumption in the production process, and difficulty in degrading or recycling waste, which do not align with the current industry trends of green manufacturing and sustainable development.

[0003] Sugarcane bagasse, an agricultural waste, is a cellulose-rich biomass material with advantages such as wide availability, renewability, and biodegradability. Currently, sugarcane bagasse is mainly used to produce low-value-added products such as packaging paper, pulp molding, and disposable tableware. However, due to inherent defects in sugarcane bagasse fibers, such as low mechanical strength, poor moisture resistance, and dimensional instability, it cannot directly meet the stringent requirements for mechanical properties, dimensional accuracy, and durability of electronic product structural components. Therefore, how to transform low-value biomass like sugarcane bagasse into high-performance electronic product structural materials through material modification, structural design, and process innovation has become an urgent technical problem to be solved in this field.

[0004] Existing technologies have made some attempts, such as blending plant fibers with plastics to prepare composite materials, but these often suffer from problems such as poor interfacial bonding, poor processing flowability, and high product density; or using a single pressing process to prepare fiberboard, whose impact resistance and bending resistance are still difficult to match those of engineering plastics. In addition, existing structural designs are mostly homogeneous single-layer or simple laminations, failing to fully utilize the synergistic reinforcement effect of different materials. Summary of the Invention

[0005] This invention provides a method for manufacturing environmentally friendly composite structural components, environmentally friendly keyboards, and sugarcane bagasse-based composite boards to solve the problems of insufficient strength and poor interfacial properties of existing plant fiber composite materials.

[0006] To address the aforementioned issues, this invention provides an environmentally friendly composite structural component, comprising a lower surface plate, an intermediate support frame, and an upper surface plate that are stacked and fixed along the thickness direction. The lower surface layer is a flat sugarcane bagasse-based composite board; The intermediate support frame is a continuous corrugated paper structure. The recessed part of the corrugated paper structure is attached to the top surface of the lower surface plate, and the protruding part of the corrugated paper structure is attached to the bottom surface of the upper surface plate. The upper surface layer is a flat sugarcane bagasse-based composite board.

[0007] As a further improvement of the present invention, the bottom surface of the lower surface plate is provided with an anti-slip mounting groove, and an anti-slip component is provided in the anti-slip mounting groove.

[0008] As a further improvement of the present invention, the top edge of the lower surface plate is provided with a ring of fitting protruding edge, the middle support frame is provided with a first folded edge, and the upper surface plate is provided with a second folded edge. The first folded edge is inserted into the second folded edge, and the fitting protruding edge is inserted between the first folded edge and the second folded edge to form a fitting structure.

[0009] To address the aforementioned issues, this invention also provides an environmentally friendly keyboard. The environmentally friendly keyboard includes keys, a circuit board, a key support, and an environmentally friendly composite structural component of any of the above. Keycaps are disposed on the keys, the keys are disposed on the key support, the circuit board is disposed at the bottom of the keys, and the environmentally friendly composite structural component serves as the bottom shell of the environmentally friendly keyboard. The key support, the circuit board, and the environmentally friendly composite structural component are fixedly connected.

[0010] As a further improvement of the present invention, the corrugated paper structure of the intermediate support frame of the environmentally friendly composite structural component is inclined along the width direction of the environmentally friendly keyboard, so that when the environmentally friendly keyboard is in use, the end closer to the user is lower than the end farther away from the user.

[0011] To address the above problems, the present invention also provides a method for manufacturing a sugarcane bagasse-based composite board, comprising: S1. Crush sugarcane bagasse into fiber powder, mix it with wood pulp fiber in a preset ratio, add a coupling agent, and stir evenly to obtain mixed fiber material. S2. Mix the mixed fiber material with deionized water, and then pulp it using a pulper to obtain fiber pulp. S3. The fiber slurry is evenly spread in the mold and wet-pressed to obtain a wet-pressed preformed board. S4. The wet-pressed preformed board is dried in a hot air drying oven and then processed by hot pressing to obtain sugarcane bagasse-based composite board.

[0012] Compared to existing technologies, the environmentally friendly composite structural component of this invention utilizes an innovative three-layer composite structure design. It organically combines two layers of bagasse-based flat sheets with a middle layer of continuously stacked corrugated paper, fully leveraging the performance advantages of each layer. This results in a final product that is both environmentally friendly and meets the mechanical requirements for engineering applications. The structure is not only lightweight and high-strength, but its compressive strength and deformation resistance also meet the practical standards for electronic product casings. Furthermore, the middle corrugated layer provides excellent impact resistance and cushioning. In addition, the structure is highly designable; the corrugation direction and parameters can be flexibly adjusted to suit the functional needs of different products and are easily integrated with practical designs such as anti-slip and interlocking features. From an industry perspective, this invention connects mature papermaking and packaging technologies, facilitating large-scale production and cost control. It provides the electronics industry with a practical and feasible green material solution that combines resource recycling, low-carbon environmental protection, and economic benefits. Attached Figure Description

[0013] Figure 1 A schematic diagram of an embodiment of the environmentally friendly composite structural component of the present invention is shown; Figure 2 This invention presents another structural schematic diagram of an embodiment of the environmentally friendly composite structural component; Figure 3 A partial cross-sectional structural diagram of one embodiment of the environmentally friendly composite structural component of the present invention is shown; Figure 4 A schematic diagram of one embodiment of the environmentally friendly keyboard of the present invention is shown; Figure 5 A flowchart illustrating one embodiment of the method for manufacturing sugarcane bagasse-based composite panels according to the present invention is shown. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0015] Figure 1 A schematic diagram of one embodiment of the environmentally friendly composite structural component of the present invention is shown. Figure 1 As shown, the environmentally friendly composite structural component includes a lower surface plate 1, a middle support frame 2, and an upper surface plate 3, which are stacked and fixed along the thickness direction; the lower surface plate 1 is a flat sugarcane bagasse-based composite board; the middle support frame 2 is a continuously stacked corrugated paper structure, with the recessed part of the corrugated paper structure attached to the top surface of the lower surface plate 1, and the protruding part of the corrugated paper structure attached to the bottom surface of the upper surface plate 3; the upper surface plate 3 is a flat sugarcane bagasse-based composite board.

[0016] Specifically, the environmentally friendly composite structural component involved in this embodiment is fundamentally designed to mimic the highly efficient load-bearing structure of "skin-core-skin" found in nature. Through the optimized combination and interface fusion of different functional materials, it aims to replace traditional petroleum-based plastics or metals with lightweight, renewable materials. This structural component consists of three functional layers stacked along the thickness direction and bonded together using a specific process. Bottom layer 1: As the base bearing surface of the structural components, it needs to have good surface flatness, a certain degree of wear resistance, and stability when in contact with the external environment (such as a tabletop). This layer is made of a composite flat plate with sugarcane bagasse as the main raw material.

[0017] Intermediate Support Frame 2: As the "mechanical backbone" of the entire structure, its core function is to provide extremely high out-of-plane bending stiffness, excellent impact resistance and energy absorption capacity, and moderate damping and vibration reduction characteristics. This layer is constructed using corrugated paper with a regular wavy geometric structure. Its design essence lies in the fact that the troughs (recesses) of the corrugations are in close contact with the top surface of the lower surface plate 1, while the crests (protrusions) are in close contact with the bottom surface of the upper surface plate 3, thereby effectively supporting and separating the upper and lower surface plates 1 to form a stable spatial structure.

[0018] Upper surface plate 3: As one of the structural components' appearance surfaces and main load-bearing surfaces, it needs to consider scratch resistance, feel, and adaptability to potential contact with internal components. This layer also uses a bagasse-based composite flat plate with the same material system as the lower surface plate 1.

[0019] It should be noted that the preparation of the sugarcane bagasse-based composite board is the foundation for realizing this invention, and its process integrates plant fiber treatment, interface modification, and high-temperature and high-pressure curing technology. The preparation process includes: 1. Raw material selection and pretreatment: 1.1 Sugarcane Bagasse Source and Initial Treatment: Fresh sugarcane bagasse from the sugar industry is preferred due to its relatively low fiber damage. First, it undergoes thorough washing to remove residual sugar and impurities, followed by natural drying or sun drying until the moisture content is low. It is then torn into bundles of fibers using coarse crushing equipment, and then gently refined using a disc mill or similar equipment. The goal is to control the fiber length within an optimal distribution range (e.g., retaining more long fibers to ensure strength, while containing a suitable amount of short fibers to fill gaps), rather than simply pulverizing it into powder. This step aims to activate the fibers and increase their specific surface area.

[0020] 1.2 Selection of Auxiliary Fibers: To compensate for certain shortcomings of bagasse fiber (such as the potential for brittleness in boards made solely from bagasse fiber), a certain proportion of other plant fibers can be incorporated. For example, softwood pulp fibers are long and strong, significantly enhancing the tensile strength of the boards; hardwood pulp fibers are shorter, helping to improve the density and smoothness of the boards. The ratio of these two fibers to bagasse fiber can be adjusted according to the target performance, for example, using a blending strategy that primarily uses bagasse fiber (e.g., accounting for 70%-85% of the total oven-dry fiber) supplemented by wood pulp fiber.

[0021] 1.3 Introduction of Environmentally Friendly Coupling Agents: This is a key chemical method for improving the performance of the board. Selected environmentally friendly coupling agents (such as bio-based silanes, citric acid derivatives, and maleic anhydride grafts mentioned above) are formulated into aqueous solutions or emulsions of a certain concentration. During the fiber mixing stage, these are uniformly applied to the fibers via spraying or impregnation. One end of the coupling agent can chemically react with active groups such as hydroxyl groups on the fiber surface or form strong hydrogen bonds, while the other end can interact with lignin, hemicellulose, or other additives released from the fibers themselves during subsequent hot pressing. This creates "molecular bridges" between the fibers, greatly improving the bonding force between them, thereby enhancing the strength, stiffness, and water resistance of the board.

[0022] 2. Molding and curing process chain: 2.1 Pulping and Homogenization: The pretreated mixed fibers are fed into a hydrapulper and mixed with warm water to prepare a pulp of suitable concentration. This pulp is then beaten using a disc mill. This process not only further loosens the fiber bundles, causing them to separate and expose more reaction sites, but also controls the fiber flexibility and bonding potential. Freeness is a key process parameter that needs to be precisely controlled according to the density and strength requirements of the target board.

[0023] 2.2 Wet Pressing: The slurry is dehydrated using a wire mesh forming machine or a rotary screen forming machine to form a continuous wet fiber mat, or the slurry is injected into a flat mold of a specific size. Wet pressing is then performed, further dehydrating and initially shaping the material under pressure. The pressure, temperature, and time of wet pressing need to be coordinated to obtain a wet blank with sufficient wet strength and easy handling without excessively damaging the fibers. During wet pressing, some of the coupling agent may begin to react.

[0024] 2.3 Drying: Wet slabs contain a large amount of moisture and must undergo a drying process. Segmented hot air drying is typically used, with the temperature gradually increasing from low to high to avoid cracking or warping caused by excessively rapid surface drying. The goal of drying is to reduce the moisture content of the slab to a low level (e.g., below 10%), creating stable conditions for subsequent hot pressing.

[0025] 2.4 Hot-pressing and curing: This is the core step that imparts the final properties of the board. The dried board blank is fed into a high-temperature hot press. Hot pressing is usually carried out at high temperatures (significantly above 100°C, for example, in the range of 150°C to 180°C) and high pressure. During this process, multiple physicochemical changes occur simultaneously: residual moisture is rapidly vaporized and discharged; lignin and hemicellulose in the fibers undergo thermoplastic flow, acting as a natural binder; the pre-added coupling agent undergoes a full cross-linking reaction; and the fibers are tightly packed together under high pressure, forming a large number of hydrogen bonds. By precisely controlling the temperature curve, pressure curve, and holding time of the hot pressing, high-performance bagasse-based composite boards with uniform density, high internal bond strength, and dimensional stability can be produced. This board can be further processed as needed, such as sanding, cutting, surface veneer, or coating.

[0026] The flute type (e.g., A-flute, B-flute, C-flute, E-flute, etc.) of corrugated paper determines its height, density, and mechanical properties. For example, B-flute is shorter and denser, with high flat crush strength, suitable for applications requiring a high degree of surface flatness; A-flute is taller and sparser, offering better cushioning performance and high vertical crush strength. The appropriate type or combination can be selected based on the specific requirements of the structural components for bending resistance, compression resistance, and cushioning. High-strength recycled paper or virgin pulp paper conforming to sustainable forest management standards should be used for both the base paper and the linerboard. Both should possess sufficient ring crush and flat crush strength. The corrugated paperboard should be precisely cut according to the shape of the structural components. Sometimes, to accommodate curved surfaces or special edge structures, die-cutting, creasing, or localized softening treatments may be necessary.

[0027] This embodiment utilizes an innovative three-layer composite structure design, organically combining the upper and lower layers of bagasse-based flat sheets with a middle layer of continuously stacked corrugated paper. This fully leverages the performance advantages of each layer, resulting in a final product that is both environmentally friendly and meets the mechanical requirements for engineering applications. This structure is not only lightweight and high-strength, with compressive strength and deformation resistance meeting practical standards for electronic product casings, but the middle corrugated layer also provides excellent impact resistance and cushioning. Furthermore, the structure offers high design flexibility; the corrugation direction and parameters can be flexibly adjusted to suit the functional needs of different products and are easily integrated with practical designs such as anti-slip and interlocking features. From an industry perspective, this invention connects mature papermaking and packaging technologies, facilitating large-scale production and cost control, and providing the electronics industry with a practical and feasible green material solution that combines resource recycling, low-carbon environmental protection, and economic benefits.

[0028] Furthermore, such as Figure 2 As shown, the bottom surface of the lower surface plate 1 is provided with an anti-slip mounting groove 11, and an anti-slip component 12 is provided in the anti-slip mounting groove 11.

[0029] Specifically, grooves with a specific pattern are designed and machined on the bottom surface of the lower surface plate 1 of the structural component. The distribution, shape, and depth of these grooves need to be determined through mechanical and functional analysis. For example, for rectangular plates, strip grooves or dot-matrix circular grooves can be set in areas near the four corners or the middle of the long side. The depth of the grooves needs to be sufficient to firmly accommodate the anti-slip component 12 without excessively weakening the local load-bearing capacity of the plate. The sides of the grooves can be designed with a slight inclination or an inverted trapezoid to create a mechanical locking effect on the anti-slip component 12. The anti-slip component 12 is made of an elastic material with a high coefficient of friction, wear resistance, and aging resistance, such as thermoplastic elastomer (TPE), rubber, or cork. Its shape and size need to be precisely matched with the "anti-slip mounting groove 11," and it is usually designed as an insert that can be embedded. The surface of the anti-slip component 12 exposed outside the groove can be designed with micro-textures to further increase friction.

[0030] The manufacturing of the anti-slip structure can be combined with the molding process of the lower surface plate 1, reducing the complexity of subsequent processing.

[0031] In some embodiments, a post-processing molding method is adopted: First, a flat lower surface plate 1 is prepared according to the method of Example 1. Then, using a CNC milling machine, laser engraving machine, or a special machine tool with specific tools, the designed "anti-slip mounting groove 11" is milled or engraved on the bottom surface of the plate. This method is highly flexible and suitable for small-batch, multi-variety production.

[0032] In other embodiments, an in-mold integral molding method is employed: a cavity corresponding to the "anti-slip mounting groove 11" protrusion is pre-machined in the hot press mold for preparing the lower surface plate 1. During hot pressing, the plate material fills the cavity under high pressure, directly forming raised reinforcing ribs or specific patterns on the bottom surface of the plate. Subsequently, only simple grinding or milling of the top of the protrusion is required to obtain a precise groove. This method is highly efficient and suitable for mass production.

[0033] Finally, a small amount of adhesive is applied to the groove, and the prefabricated anti-slip part 12 is pressed into the groove. After the adhesive cures, the anti-slip part 12 is firmly fixed. Due to the constraint of the groove structure, the anti-slip part 12 is not easy to fall off when subjected to shear forces during daily use.

[0034] Furthermore, such as Figure 3 As shown, the top edge of the lower surface plate 1 is provided with a ring of fitting protruding edge 13, the middle support frame 2 is provided with a first folded edge 21, and the upper surface plate 3 is provided with a second folded edge 31. The first folded edge 21 is inserted into the second folded edge 31, and the fitting protruding edge 13 is inserted between the first folded edge 21 and the second folded edge 31 to form a fitting structure.

[0035] Specifically, the interlocking structure of this embodiment involves the coordinated deformation and interlocking of the edges of three components. Specifically, the "interlocking protrusion 13" of the lower surface plate 1: A continuous ring of protruding edges with a specific cross-sectional shape (such as rectangle or trapezoid) is formed upwards (towards the interior of the plate) on the outer edge of the lower surface plate 1 through material accumulation or bending. This protrusion serves as both a reinforcing rib and a key component for subsequent interlocking. The "first folded edge 21" of the intermediate support frame 2: Corrugated paper edges are typically weak. By pre-applying glue and bending the edges of the corrugated paperboard vertically upwards (or inwardly inclined) to a certain height along a predetermined fold line, a ring of vertical walls is formed. This vertical wall enhances the rigidity of the corrugated edges and provides lateral support for interlocking. The "second folded edge 31" of the upper surface plate 3: Similarly, a ring of vertical walls is formed downwards (towards the interior of the plate) on the outer edge of the upper surface plate 3 through hot-press bending or pre-forming.

[0036] It should be noted that the specific process for assembling the three components is as follows: 1. Apply adhesive to the top edge of the lower surface panel 1 (including the outer side of the "fitting protrusion 13").

[0037] 2. Align and place the middle support frame 2 (corrugated paper) down, ensuring that its flat part fits against the lower surface plate 1, while the inner side of its "first folded edge 21" contacts and adheres to the outer side of the "fitting protrusion 13" of the lower surface plate 1.

[0038] 3. Apply adhesive to the inner side and bottom edge of the "second folded edge 31" of the upper surface plate 3.

[0039] 4. Cover the upper surface plate 3 with its "second folded edge 31" so that it fits over the "first folded edge 21" of the middle layer from the outside. During this process, the top or side of the "fitting protrusion 13" of the lower surface plate 1 is pressed tightly into and accommodated in the cavity gap formed by the "first folded edge 21" and the "second folded edge 31".

[0040] 5. Apply pressure to cure the adhesive. Ultimately, the three-layer structure forms a mechanically interlocked state at the edges, with the protruding edge "locked between the two vertical walls," supplemented by chemical bonding.

[0041] In this embodiment, when the edge is subjected to a force attempting to tear the layers apart, this force is transformed into compression and shearing on the "interlocking protrusion 13," as well as tensile stress on the opposing wall. The mechanical interlocking structure greatly disperses and offsets the peeling stress, resulting in an order-of-magnitude increase in edge delamination strength. Multiple folds form a tortuous sealing path, effectively preventing external moisture from penetrating the interlayer along the edge interface, thus improving the product's durability in humid environments. The folded edge structure has a self-positioning function during assembly. The final product has clear and neat edge lines, requiring no additional plastic edging or metal trim, presenting a simple yet robust industrial aesthetic.

[0042] Figure 4 A structural schematic diagram of one embodiment of the environmentally friendly keyboard of the present invention is shown. Figure 4 As shown, the environmentally friendly keyboard includes a key 100, a circuit board 200, a key support 300, and an environmentally friendly composite structural component 400 according to any of the above embodiments. Keycaps are disposed on the key 100, the key 100 is disposed on the key support 300, the circuit board 200 is disposed on the bottom of the key 100, and the environmentally friendly composite structural component 400 serves as the bottom shell of the environmentally friendly keyboard. The key support 300, the circuit board 200, and the environmentally friendly composite structural component 400 are fixedly connected.

[0043] Specifically, this embodiment applies the aforementioned high-performance, multi-functional layered composite structural component to a typical consumer electronics product—a mechanical keyboard—demonstrating its feasibility as a core structural component. This environmentally friendly keyboard, from top to bottom, includes: keys 100, a circuit board 200, a key support 300, and a bottom shell. The environmentally friendly composite structural component 400 of this invention plays the role of the bottom shell in this system, serving as the mounting base, structural support, and acoustic cavity for the entire keyboard.

[0044] This embodiment applies the environmentally friendly composite structural component 400 to the keyboard base, achieving a deep integration of high performance and green concepts. Through a unique three-layer design (dense bagasse surface layer + corrugated core layer), this structure significantly reduces weight while providing rigidity and damping far exceeding traditional plastics, effectively suppressing deformation and resonance, resulting in a solid and stable feel. Its excellent acoustic modulation capability absorbs keystroke noise, producing a deeper and more pleasant typing sound. Its core environmental value is prominent, using renewable bagasse as the main raw material, significantly reducing the carbon footprint and creating a distinct green product image. Furthermore, edge-fitting and other designs enhance structural durability, while the adoption of mature papermaking and hot-pressing processes ensures industrial feasibility and cost advantages. This solution successfully transforms waste biomass into a core component of high-end consumer electronics, achieving an excellent balance between structural performance, user experience, environmental benefits, and manufacturing economics.

[0045] Furthermore, such as Figure 4As shown, the corrugated cardboard structure of the middle support frame of the environmentally friendly composite structural component 400 is inclined along the width direction of the environmentally friendly keyboard, so that when the environmentally friendly keyboard is in use, the end closer to the user is lower than the end farther away from the user.

[0046] Specifically, in this embodiment, in the context of keyboard applications, the corrugation direction of the intermediate support layer is strategically arranged to give the product a natural, ergonomic tilt angle. Corrugated cardboard is a typical orthotropic material. Its flat crush strength and flexural stiffness are highest along the corrugation direction (i.e., the direction of corrugation extension), while its performance perpendicular to the corrugation direction is much weaker. When a corrugated board is subjected to a load perpendicular to its plane, its deformation behavior is significantly affected by the corrugation direction.

[0047] In this design, the corrugated direction of the middle support frame is intentionally set to form a non-zero angle α with the width direction of the keyboard base (i.e., the short side direction, which is usually the direction the user is facing). This angle α is a key parameter that has been calculated and optimized experimentally, and is usually between 5 and 15 degrees.

[0048] When the keyboard is placed horizontally on a table, its own weight and the pressure exerted by the user's hands on the keycaps (mainly acting on the front area of ​​the keyboard) constitute a combined load on the bottom shell. Due to the tilt in the corrugated direction, the equivalent stiffness distribution along the length of the keyboard (from front to back) is not uniform in the middle area of ​​the bottom shell when bearing these loads.

[0049] Finite element analysis and physical testing have determined that, at a specific corrugated tilt angle α, the vertical compressive deformation of the front (closest to the user) area of ​​the keyboard is slightly greater than that of the rear area. This subtle, non-uniform elastic deformation accumulates to give the entire keyboard a stable tilt angle where the front edge is slightly lower and the rear edge is slightly higher when naturally placed. This angle precisely matches the ergonomic recommendations for wrist relaxation, effectively reducing wrist fatigue caused by prolonged typing.

[0050] Figure 5 A flowchart illustrating one embodiment of the method for manufacturing a sugarcane bagasse-based composite board according to the present invention is shown. Figure 5 As shown, the method includes: Step S1: Crush sugarcane bagasse into fiber powder, mix it with wood pulp fiber in a preset ratio, add a coupling agent, and stir evenly to obtain mixed fiber material.

[0051] Step S2: Mix the mixed fiber material with deionized water, and then pulp it using a pulper to obtain fiber pulp.

[0052] Step S3: The fiber slurry is evenly spread in the mold and wet-pressed to obtain a wet-pressed preform.

[0053] Step S4: Place the wet-pressed preformed board in a hot air drying oven to dry, and then process it through a hot pressing process to obtain a sugarcane bagasse-based composite board.

[0054] Specifically, this embodiment integrates the previously mentioned sugarcane bagasse-based composite board preparation processes into a systematic, coherent, and industrially scalable complete process chain, which specifically includes: 1. Fiber Raw Material Engineering: The degree of pretreatment of bagasse fibers (cleanliness, tear resistance, length distribution) is the starting point for determining the performance of the board. Excessive mechanical treatment will seriously damage the fiber length and reduce the strength; insufficient treatment will result in more impurities and fiber bundles, affecting uniformity and bonding.

[0055] The incorporation of wood pulp fibers is not merely a simple "blending," but rather an optimization of "fiber gradation." Long fibers form the framework, while short and fine fibers fill the gaps. The combination of fibers from different sources can optimize the water permeability of the pulp and the physical properties of the finished board.

[0056] 2. Interfacial chemical modification (coupling agent application): This step serves as a bridge between physical treatment and chemical fortification. The selection of coupling agents must consider their chemical compatibility with bagasse fibers, reactivity, environmental friendliness, and cost.

[0057] The method of application is crucial. Dry addition (powder mixing) may result in uneven distribution; wet addition (solution impregnation) is more uniform but involves subsequent dehydration. A better approach is to spray the fiber when it has been dried to a certain moisture content, balancing uniformity with process complexity.

[0058] There is an optimal amount of coupling agent. Too little will result in poor modification; too much may form a brittle interfacial layer or lead to waste. The optimal addition ratio for a specific fiber combination needs to be determined through systematic experiments.

[0059] 3. Fluidization preparation and molding (slurry preparation and wet pressing): Freeness is one of the core parameters of pulp. Increasing the freeness allows for more complete fiber fibrillation, increasing the bonding area and thus improving the density and strength of the board. However, it reduces the pulp's filtration rate and may decrease fiber length. Therefore, the pulping process needs to be developed in reverse based on the density, strength, and internal bond strength requirements of the target board.

[0060] The goal of wet pressing is efficient dehydration and achieving initial strength. The combination of pressure, temperature, and time needs to be optimized. Higher temperatures and pressures aid dehydration and initiate some chemical reactions, but it's crucial to avoid crushing the fibers. Modern equipment can employ multi-stage pressurization and temperature control to achieve finer dehydration profiles.

[0061] 4. Solid-state transformation and performance determination (drying and hot pressing): Drying is not just about removing moisture; it's also a process of stress relief and structural stabilization. Rapid drying can lead to excessively fast surface hardening and shrinkage, causing internal stress cracking (commonly known as "plate bursting"). A high-speed circulating hot air drying system with gradient temperature control and humidity regulation is crucial. Infrared or microwave-assisted drying technologies can also be used to improve efficiency and uniformity.

[0062] Hot pressing: This is the true "performance forging" stage. The three elements of hot pressing (temperature T, pressure P, and time t) are coupled together and jointly determine the microstructure and macroscopic properties of the final sheet material.

[0063] Temperature (T): It must be above the glass transition temperature of lignin and hemicellulose in the fiber to soften and flow them, allowing them to act as a natural binder. Temperature also directly affects the rate and extent of the coupling agent reaction. Excessively high temperatures may lead to thermal degradation of the fiber, darkening of its color, or even charring.

[0064] Pressure (P): Forces the softened fibers into close contact, promotes the formation of intermolecular forces (hydrogen bonds), compacts the structure, and reduces porosity. The magnitude of pressure affects the density and thickness of the board.

[0065] Time (t): Ensures sufficient heat transfer to the center of the slab, guaranteeing complete plasticization and cross-linking reactions within the slab. Insufficient time leads to incomplete core curing and uneven performance; excessive time reduces production efficiency.

[0066] The press typically employs a cycle of "preheating-pressurizing-holding-cooling". Advanced presses can be programmed to control complex curves of T, P, and t to produce sheets with different specifications and performance requirements.

[0067] This embodiment achieves a reliable conversion of agricultural waste into high-performance engineering materials through a complete and controllable industrial process. The process strengthens the fiber network from the source through precise fiber gradation optimization and interface modification with environmentally friendly coupling agents. Combined with gradient drying and programmed hot-pressing curing technologies, it achieves precise control over the material's microstructure, thereby stably producing homogeneous boards with high strength, excellent water resistance, and dimensional stability. This system solution not only makes the material properties designable, enabling customized production according to the specific requirements of electronic product structural components, but also ensures high compatibility with existing paper and wood-based panel industries, providing a clear industrialization path and cost control advantages. More importantly, the entire process chain adheres to green principles, from renewable raw materials and bio-based additives to efficient molding technologies, fully demonstrating the dual environmental and economic value of converting low-value biomass into high-end electronic materials.

[0068] The specific embodiments of the invention have been described in detail above, but these are merely examples, and the invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the invention are also within the scope of this invention. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of this invention should be included within the scope of this invention.

Claims

1. An environmentally friendly composite structural component, characterized in that, It includes a lower surface plate, an intermediate support frame, and an upper surface plate that are stacked and fixed along the thickness direction; The lower surface layer is a flat sugarcane bagasse-based composite board. The intermediate support frame is a continuous corrugated paper structure, with the recessed part of the corrugated paper structure attached to the top surface of the lower surface plate and the protruding part of the corrugated paper structure attached to the bottom surface of the upper surface plate. The upper surface plate is a flat sugarcane bagasse-based composite board.

2. The environmentally friendly composite structural component according to claim 1, characterized in that, The bottom surface of the lower surface plate is provided with an anti-slip mounting groove, and an anti-slip component is provided in the anti-slip mounting groove.

3. The environmentally friendly composite structural component according to claim 1, characterized in that, The top edge of the lower surface plate is provided with a ring of fitting protruding edge, the middle support frame is provided with a first folded edge, and the upper surface plate is provided with a second folded edge. The first folded edge is inserted into the second folded edge, and the fitting protruding edge is inserted between the first folded edge and the second folded edge to form a fitting structure.

4. An environmentally friendly keyboard, characterized in that, The environmentally friendly keyboard includes keys, a circuit board, a key support, and an environmentally friendly composite structural component as described in any one of claims 1-3. The keycaps are disposed on the keys, the keys are disposed on the key support, the circuit board is disposed at the bottom of the keys, and the environmentally friendly composite structural component serves as the bottom shell of the environmentally friendly keyboard. The key support, the circuit board, and the environmentally friendly composite structural component are fixedly connected.

5. The environmentally friendly keyboard according to claim 4, characterized in that, The corrugated cardboard structure of the intermediate support frame of the environmentally friendly composite structural component is inclined along the width direction of the environmentally friendly keyboard, so that when the environmentally friendly keyboard is in use, the end closer to the user is lower than the end farther away from the user.

6. A method for manufacturing a sugarcane bagasse-based composite board, characterized in that, include: S1. Crush sugarcane bagasse into fiber powder, mix it with wood pulp fiber in a preset ratio, add a coupling agent, and stir evenly to obtain mixed fiber material. S2. The mixed fiber material is mixed with deionized water and pulped using a pulping machine to obtain fiber pulp; S3. The fiber slurry is evenly spread in the mold and wet-pressed to obtain a wet-pressed preformed plate. S4. The wet-pressed preformed board is placed in a hot air drying oven for drying, and then processed by hot pressing to obtain the sugarcane bagasse-based composite board.

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