Preparation method of intelligent ecological plastic-wood board with integrated structure and function

Abstract

The invention discloses a preparation method of a structure and function integrated intelligent ecological plastic-wood board, and relates to the technical field of building materials, the method comprises the following specific steps: S100, functional linen thread pretreatment: linen threads are divided into three types to be treated, and water conveying linen threads are subjected to hydrophilic modification; through three-in-one cooperation of functional fiber element directional design, three-dimensional space ordered weaving and biomimetic mineralization interface strengthening, the common problems that a traditional composite material is weak in interface and mixed in function are solved, firstly, flax threads are refined and modified, then the flax threads are synchronously and accurately woven into a preset three-dimensional position on line through the three-dimensional orthogonal weaving technology, and the composite material is obtained. And physical isolation and ordered distribution of functional channels are realized. Bionic mineralization is synchronously applied to all flax threads, a nano calcium carbonate layer grows on the surface of the flax threads in situ, mechanical riveting is generated through a nano coarse structure, multi-layer interface strengthening from physical interlocking to chemical bonding is achieved, and a foundation is laid for multifunctional efficient stable cooperation.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a method for preparing an integrated structural and functional intelligent eco-friendly plastic-plastic board. Background Technology

[0002] Against the backdrop of green building and smart city development, higher requirements are being placed on building envelope materials than on traditional structural load-bearing structures. These materials are expected to integrate multiple functions, including ecological regulation (such as vertical greening support and humidity control) and intelligent sensing (such as structural health monitoring and environmental feedback). Wood-Plastic Composites (WPC), due to its environmental friendliness, corrosion resistance, and ease of processing, has been widely used in outdoor building materials and is a potential carrier material.

[0003] Currently, the fundamental differences in chemical polarity and surface energy between natural plant fibers (such as hemp and wood flour) and thermoplastics (such as polyethylene and polypropylene) result in weak interfacial adhesion, a long-standing challenge hindering the improvement of the mechanical properties of composite materials. More importantly, attempts to introduce continuous phases (such as functional fibers) with specific functions like water transport, drug delivery, and electrical conductivity into composite materials exacerbate the interfacial compatibility issues between these functional phases and the hydrophobic plastic matrix. These phases are highly prone to debonding during processing or use, leading to functional failure or becoming sources of stress defects. Existing methods for imparting functionality to wood-plastic composites often employ blending (such as adding antibacterial masterbatches or conductive fillers) or surface coating. Blending methods result in random distribution of functional fillers, making it difficult to form an ordered, continuous functional network, and high filler content often severely impairs the mechanical properties of the matrix. When multiple functions need to be integrated simultaneously, these methods are more likely to cause interference between functional components (for example, conductive fillers may cause drug inactivation, and hydrophilic components may damage the interface), failing to achieve the ordered, independent, and synergistic coexistence of various functions in space. To achieve structural enhancement and functional integration, existing technologies have attempted post-composite processes such as lamination and embedded prefabrication. However, these processes are often cumbersome and prone to introducing defects such as pores and weak interfaces between layers or around the embedded parts, affecting the overall integrity, durability, and reliability of the product. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a method for preparing an integrated structural and functional intelligent eco-friendly plastic board. This method involves a multi-level collaborative process, including three-dimensional skeleton spatial weaving, biomimetic mineralization interface enhancement, melt injection molding, and intelligent system encapsulation. First, ramie threads are refined and directionally modified to prepare functional units for structural reinforcement, capillary water transport, drug sustained release, and resistance sensing. Then, using three-dimensional orthogonal weaving technology, these functional units are woven online, synchronously, and precisely into predetermined spatial positions to construct a three-dimensional network skeleton prefabricated body with controllable porosity and orderly distribution of functional channels. Next, biomimetic mineralization treatment is applied to all ramie threads to grow a layer of nano-calcium carbonate crystals in situ on their surface, achieving mechanical bonding and chemical bonding with the subsequent plastic matrix, fundamentally strengthening the interface. Subsequently, high-performance plastic wood granules are injected under high pressure to completely fill the skeleton prefabricated body, resulting in a dense composite substrate in one step. Finally, by integrating sensing modules and water supply interfaces, the intelligent ecosystem is encapsulated.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing an integrated structural and functional intelligent eco-friendly plastic-plastic board, the specific steps of which are as follows: S100, Functional Hemp Thread Pretreatment: The hemp threads are divided into three categories for treatment: water-transporting hemp threads are impregnated in a 5-8% (w / w) chitosan-acetic acid solution and then dried for cross-linking modification; drug-loaded hemp threads are vacuum impregnated in an ethanol solution containing berberine and paeonol extracts, with a loading of 1.5-3% of their dry weight; and sensing hemp threads are coated with a carbon nanotube / waterborne polyurethane conductive coating or coupled with an optical fiber core. All basic hemp threads undergo biomimetic mineralization treatment in simulated body fluid at 37°C for 24-48 hours, growing a nano-calcium carbonate crystal layer on their surface.

[0006] S200, Three-dimensional skeleton weaving and integration: Using the base hemp thread after surface mineralization treatment as the warp and weft directions, a three-dimensional network skeleton with a porosity of 60-75% is made through a three-dimensional orthogonal weaving process. During the weaving process, the pre-treated water-carrying hemp thread and the drug-loaded hemp thread are distributed in vertical channels and arranged at a density of ≥5 threads / 10cm². The sensing hemp thread is distributed in horizontal monitoring grids and arranged at a density of 2-4 threads / 10cm². They are simultaneously woven into the designated three-dimensional spatial position of the skeleton to form a multifunctional composite prefabricated body. S300, preparation of wood-plastic composite melt: High-density polyethylene granules, 60-80 mesh poplar wood powder, maleic anhydride graft compatibilizer and antioxidant are mixed in a mass ratio of 100:50:6:0.5 and fed into a co-rotating parallel twin-screw extruder. The mixture is melt-blended in five temperature zones within the 160-185℃ range, and then dehydrated and kneaded in a vacuum devouring section. The mixture is then extruded into a co-extrusion die and cooled with water to form uniform wood-plastic composite granules. S400, extrusion composite molding: The multifunctional composite preform is placed in a molding mold preheated to 80°C, the wood-plastic composite granules are heated to 175±5°C and injected into the mold under an injection pressure of 10-15MPa. After extrusion and shaping, the mold is demolded to form a substrate with hemp fiber network as reinforcing ribs. S500, Post-processing and System Packaging: The formed substrate is cut to size, the in-board sensing hemp wire network of the substrate is connected to a micro monitoring module that integrates temperature, humidity and strain sensors, and a standardized water supply interface that can be connected to an external water source is integrated on the side of the board. Finally, the surface is co-extruded to obtain an eco-friendly wood-plastic wall panel that integrates structural reinforcement, ecological maintenance and intelligent monitoring.

[0007] More specifically, in S100, during the pretreatment of the functional hemp thread, the hydrophilic modifier used in the water-conveying hemp thread is a chitosan acetic acid solution or a polyvinyl alcohol solution; the natural extract impregnated in the drug-loaded hemp thread is one or more of berberine, paeonol, osthol, or azadirachtin; the conductive coating of the sensing hemp thread is a carbon nanotube dispersion, graphene slurry, or PEDOT:PSS; the photosensitive coating is a photocurable resin doped with fluorescent dye; and the surface nano-mineralization treatment is biomimetic deposited nano-calcium carbonate or nano-silica. Both the water-conveying and drug-loaded hemp threads are woven into the vertical channels of the skeleton, spatially parallel but functionally synergistic. The capillary network formed by the water-conveying hemp threads can evenly transport moisture to all parts of the plate, while the created micro-humid environment helps to activate and slowly release the natural antibacterial components in adjacent drug-loaded hemp threads, achieving dynamic synergy between moisture transport and drug release in time and space, resulting in a continuous and active anti-mildew ecological effect.

[0008] Furthermore, in S100, during the pretreatment of the functional hemp thread, the natural extract impregnated in the drug-loaded hemp thread is a compound of berberine and paeonol, with a mass ratio of 1:1.5 to 1:2. The sheet resistance of the carbon nanotube / waterborne polyurethane conductive coating on the sensing hemp thread is in the range of 10²-10. 4 Ω / sq, coating thickness of 10-30μm, the simulated body fluid used in the biomimetic mineralization treatment is a 10-fold concentrated SBF solution, and the coverage of the crystal layer on the surface of the hemp thread after mineralization is ≥90%.

[0009] Furthermore, in the S100 functional hemp thread pretreatment, the hydrophilic modification treatment temperature is 40-80℃, the treatment time is 0.5-2 hours, the drug loading impregnation is carried out at 25-60℃ and vacuum degree -0.05 to -0.1MPa, and the impregnation time is 1-4 hours; the sensing coating is applied by dip-coating method, the lifting speed is 10-100mm / min, and after coating, it is cured at 60-120℃ for 10-60 minutes; the nano-mineralization treatment is carried out in a constant temperature oscillator at a temperature of 25-40℃ and an oscillation frequency of 50-150rpm.

[0010] Furthermore, in S200, during the three-dimensional skeleton weaving and integration, the porosity of the three-dimensional network skeleton is 60%-80%, the fineness of the base hemp thread is 600-1500 metric count, the thickness of the single-layer skeleton formed by weaving is 3-8mm, and the layers are stitched together by the base hemp thread in a figure-eight pattern.

[0011] Furthermore, in the S200, the three-dimensional skeleton weaving and integration, the water-carrying hemp threads are arranged vertically with a distribution density of 5-12 threads / 100cm², and the sensing hemp threads are arranged in a horizontal grid to form a monitoring unit with a grid side length of 20-50mm. After weaving, the positional deviation of each functional hemp thread within the skeleton does not exceed ±1.5mm of the designed position.

[0012] Furthermore, in S300, during the preparation of the wood-plastic composite, the plastic granules are high-density polyethylene or polypropylene, the wood flour is 60-100 mesh poplar or pine flour, and the mass ratio of the two is 50:50 to 70:30. The compatibilizer is maleic anhydride-grafted polyethylene, and the addition amount is 3%-6% of the total mass of the plastic and wood flour. The antioxidant is a compound of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris(2,4-di-tert-butylphenyl) phosphite, and the total addition amount is 0.3%-0.5% of the total mass of the plastic and wood flour.

[0013] Furthermore, in the S300 process of preparing wood-plastic composite melt, the twin-screw extruder has a screw length-to-diameter ratio of 36:1 to 44:1, a main screw speed of 180-220 r / min, a feed rate to screw speed ratio of 0.6-0.8 kg / h / (r / min), and temperature control in each zone as follows: feeding zone 1 145-155℃, melting zone 2 160-170℃, mixing zone 3 165-175℃, homogenization zone 4 170-180℃, and die head zone 5 175-185℃. The vacuum degree in the vacuum devolatilization section is maintained at -0.06 to -0.08 MPa, and the moisture content of the wood-plastic composite granules after dehydration and kneading is ≤0.1%.

[0014] Furthermore, in the S500 post-processing and system packaging, the fixed-length cutting uses a water jet or a CNC saw blade with a diamond coating, with a cutting accuracy of ±0.5mm. The micro monitoring module integrates temperature, humidity, strain, and resistance measurement units, and is connected to the sensing hemp wire network through a waterproof connector. The data sampling frequency is 1-10Hz. The water supply interface is a quick-connect PE pipe connector with an inner diameter of 4-6mm, which is connected to the main water supply hemp wire channel pre-embedded in the plate through a sealing rubber ring.

[0015] Furthermore, in the S500, during post-processing and system packaging, the surface co-extrusion treatment uses an independent co-extrusion die head, with a co-extrusion temperature of 190-210℃ and an extrusion pressure of 8-12MPa.

[0016] Compared with existing technologies, this method for preparing an integrated structural and functional intelligent eco-friendly plastic board has the following advantages: I. This invention solves the common problems of weak interfaces and mixed functions in traditional composite materials through a three-pronged approach: directional design of functional fiber units, ordered three-dimensional weaving, and biomimetic mineralization interface reinforcement. Unlike the crude approach of simply blending functional components with the matrix or applying a coating in the post-processing stage, this method first refines and modifies the hemp fibers to create distinct structural ribs, capillaries, and fibers. Then, using three-dimensional orthogonal weaving technology, much like constructing the skeleton, blood vessels, and nerves of a living organism, these functional units are woven online, synchronously, and precisely into predetermined three-dimensional spatial positions. This achieves physical isolation and ordered distribution of functional channels, preventing performance interference from the outset. Furthermore, all hemp fibers undergo biomimetic mineralization treatment, resulting in the in-situ growth of a nano-calcium carbonate crystal layer that is firmly bonded to the fibers. This mineralized layer, on the one hand, mechanically bonds with the molten plastic through its nanoscale rough structure; on the other hand, its surface polar ions (such as Ca²⁺) can generate strong chemical interactions with the compatibilizer (MAPE), achieving multi-level interface reinforcement from physical interlocking to chemical bonding. These measures have solved the long-standing problem of weak interfaces between natural hydrophilic hemp fibers and hydrophobic plastic matrices.

[0017] II. This invention utilizes a highly efficient process path of integrated prefabricated skeleton and high-pressure extrusion molding, eliminating the need for complex post-composite processes such as lamination and embedding, which are prone to defects. It achieves a one-time high-pressure extrusion molding of a high-porosity, multifunctional three-dimensional hemp fiber skeleton prefabricated body and a high-performance wood-plastic composite melt. The high pressure (12.0 MPa) ensures near-complete filling (>99%) of the complex network of pores (porosity 68.0%) by the melt. Micro-CT confirms the internal density and lack of defects, achieving efficient and high-quality manufacturing of macroscopic components. The flexural strength reaches 42.3 MPa, possessing stable capillary water transport and long-term mildew resistance, and integrating a strain sensing network with an accuracy of ±5με.

[0018] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 A flowchart of a method for preparing an integrated structural and functional intelligent eco-friendly plastic-plastic board; Figure 2 A flowchart of the functional hemp thread pretreatment process for a method of preparing a structurally and functionally integrated intelligent eco-friendly plastic board; Figure 3 This is a parameter performance diagram of a method for preparing an integrated structural and functional intelligent eco-friendly plastic board. Detailed Implementation

[0021] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0022] In the overall scheme, firstly, disordered fibers are positioned into an ordered skeleton through three-dimensional weaving, providing a physical carrier for the spatially ordered distribution of subsequent functions (structural dimension); secondly, during the skeleton weaving process, pre-modified functional hemp threads are woven online and synchronously into designated positions, realizing the independent construction and precise arrangement of multifunctional networks such as water delivery, drug delivery, and sensing in three-dimensional space from the source (functional dimension); finally, through high-pressure infiltration composite molding of the skeleton with molten wood-plastic composite, the strong interfacial bonding provided by the biomimetic mineralization layer is used to firmly combine the functional skeleton with the structural matrix into one unit (interface dimension). Details are as follows: Example

[0023] Raw materials, reagents and equipment: Ramie thread raw material: Ramie thread (800 metric count) (Ramie fiber has advantages such as high initial modulus, high strength, and good moisture absorption and breathability. The high fineness of 800 metric count means that the diameter of a single ramie thread is smaller, thus having a larger specific surface area. This not only facilitates the full adsorption and loading of subsequent functional modifiers, but also provides a larger mechanical interlocking interface with the wood-plastic matrix, while improving the flexibility of the fiber and facilitating the weaving of complex three-dimensional structures). According to function, it is divided into: basic structural ramie thread, water conveying ramie thread, drug-carrying ramie thread, and sensing ramie thread.

[0024] Basic structural hemp fiber: As a continuous reinforcing phase of composite materials, it forms the main load-bearing frame, mainly providing strength and stiffness.

[0025] Water-carrying hemp thread: After hydrophilic modification, it serves as a passive capillary water-carrying channel. Its hydrophilicity is the core of driving spontaneous and uniform water transport.

[0026] Drug-loaded hemp thread: As a slow-release reservoir for antibacterial and antifungal agents, it achieves long-term antifungal properties by loading natural antibacterial drugs.

[0027] Sensing function hemp wire: After a conductive coating is applied to the surface, it serves as an embedded distributed sensor, endowing the material with the ability to sense strain and state.

[0028] Wood-plastic composite matrix raw material: High-density polyethylene granules (grade DMDA-8008, melt index 0.8 g / 10min). The melt index is in the low to medium range, ensuring good melt strength during injection molding. It can maintain continuous penetration pressure on the porous skeleton under high pressure without easily breaking, while the melt has sufficient fluidity to complete complex filling. Its inherent toughness also provides impact resistance for the finished product. Poplar wood flour (60 mesh, sieve pass rate ≥95%, dried to moisture content <3%) ensures a concentrated particle size distribution. It is dried before use to ensure a moisture content strictly below 3%. Fine wood flour helps improve the rigidity, dimensional stability, and heat distortion temperature of composite materials, while reducing costs. Controlling extremely low moisture content is crucial for the success of the process, effectively avoiding defects such as bubbles and silver streaks caused by moisture evaporation during processing, and ensuring good interfacial adhesion with the plastic matrix.

[0029] Modifiers and functional reagents: Hydrophilic modifier: Chitosan with a degree of deacetylation ≥ 90% is dissolved in 1% (v / v) acetic acid solution to prepare a 6% (w / w) working solution. The high degree of deacetylation ensures the presence of a large number of free amino groups, which are fully protonated (positively charged) in acidic solution, generating a strong electrostatic attraction with the negatively charged surface of hemp cellulose, and forming a strong and durable hydrophilic coating through a hydrogen bond network.

[0030] Drug-loading reagents: Berberine (purity ≥98%) and Paeonol (purity ≥95%), mixed in a mass ratio of 1:1.8 using analytical grade anhydrous ethanol as solvent. This ratio is based on the optimal synergistic ratio obtained from previous antibacterial experiments. Analytical grade anhydrous ethanol is used as the solvent because it has good affinity for hemp fibers and high volatility, which facilitates the diffusion of the drug into the fiber and subsequent drying.

[0031] Sensing coating material: Multi-walled carbon nanotube dispersion (5% solid content, CNT purity >95%, length 10-30μm) and self-crosslinking waterborne polyurethane emulsion (40% solid content), compounded at a mass ratio of 1:4. CNTs provide conductive pathways, and WPU acts as a flexible binder. The combination of the two forms a conductive coating with strong adhesion and bend resistance on the surface of the hemp thread.

[0032] Interface mineralization reagent: Analytical grade reagents (NaCl, NaHCO3, KCl, K2HPO4·3H2O, MgCl2·6H2O, CaCl2, Na2SO4) used to prepare 10-fold concentrated simulated body fluid (10×SBF). The concentration ratio simulates the human blood plasma environment and can induce heterogeneous nucleation and growth of calcium carbonate (CaCO3) crystals on the surface of hemp fibers rich in polar groups under mild conditions (37°C, pH≈7.4).

[0033] Wood-plastic compatibilizer: Maleic anhydride-grafted polyethylene (MAPE, grafting rate 0.9%). Its anhydride groups can react chemically or have strong polar effects with the hydroxyl groups (-OH) on the surface of wood flour and the Ca²⁺ on the surface of mineralized hemp, while its polyethylene backbone co-melts and co-crystallizes with the HDPE matrix, thereby building a strong molecular bridge between the two incompatible phases.

[0034] Antioxidant system: The primary antioxidant, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (Irganox 1010), is compounded with the secondary antioxidant, tris(2,4-di-tert-butylphenyl) phosphite (Irganox 168), at a mass ratio of 2:1. This system effectively inhibits the thermal oxidative degradation of HDPE and wood flour during high-temperature processing and long-term outdoor use, maintaining stable material properties.

[0035] Key equipment: Precision electronic balance (accuracy 0.1mg); The vacuum impregnation device (provides a negative pressure environment (-0.08 MPa) for the drug-loaded hemp thread, which is a key guarantee for achieving deep and uniform drug loading); Electric heating forced-air drying oven; A constant-temperature oscillator (provides a constant temperature (37°C) and a dynamic solution environment (100 rpm) for the biomimetic mineralization process, ensuring a uniform and controllable mineralization reaction); Precision dip-coating machine: By controlling the lifting speed (50 mm / min), the thickness of the conductive coating on the sensing hemp wire can be precisely controlled; Three-dimensional orthogonal braiding machine (8 spindles): It can automatically weave a three-dimensional hemp thread skeleton with precise and controllable pore structure. Furthermore, through its auxiliary yarn guiding system, it can realize the online, synchronous, and positioning weaving of various functional hemp threads, and achieve spatial functional ordering. High-speed mixer (SHR-10A); Co-rotating parallel twin-screw extruder (screw diameter 35mm, length-to-diameter ratio 40:1): The large length-to-diameter ratio provides ample space for conveying, melting, mixing, shearing, and devolatilization. Combined with precise temperature control in the temperature zones and the setting of the vacuum devolatilization port (-0.07 MPa), it ensures high dispersion of wood flour, sufficient interfacial reaction, and complete removal of moisture and volatiles. After extrusion into a co-extrusion die and cooling with water, high-performance wood-plastic composite granules are produced. Precision injection molding machine (clamping force 80T): provides stable and sufficiently high injection pressure (12.0 MPa) to ensure that the high viscosity wood-plastic melt can overcome flow resistance, fully penetrate and densify the hemp fiber skeleton preform with a porosity of up to 68%; Flat die: (co-extrusion die); CNC cutting machine; Co-extrusion molding unit; Digital multimeter / four-probe tester: (used for quantitative measurement of the surface resistivity (sheet resistance) of the sensing filament coating, and to evaluate the uniformity and stability of its conductivity). Scanning electron microscope (SEM): (used to observe the surface modification morphology of fibers, the coverage of mineralized layers, and the interface bonding state of cross sections, and to perform elemental analysis). X-ray microscopic imaging system (Micro-CT): (used for non-destructive three-dimensional scanning of injection-molded samples, visually verifying the filling rate and uniformity of the melt in the skeleton pores, and is the most direct means of evaluating the composite molding effect). Microcomputer-controlled electronic universal testing machine.

[0036] Detailed preparation steps explained: S100, Refined and Directional Modification Pretreatment of Functional Hemp Threads: Hydrophilic modification of water-transporting hemp thread: Accurately measure a 6% chitosan-acetic acid solution into the impregnation tank; The water-transporting hemp thread is completely immersed in the solution and left to stand at 25°C for 30 minutes to ensure that the biopolymer solution fully wets and penetrates into the microfibrils of the hemp fibers. After being removed, transfer it to a forced-air drying oven and dry it at 80℃ for 2 hours; During this process, chitosan undergoes physical entanglement and hydrogen bonding on the surface and inside of the hemp thread. The volatilization of some acetic acid promotes the formation of a denser cross-linked network between chitosan molecular chains, thereby constructing a stable and highly hydrophilic modified layer on the surface of the hemp thread, with its contact angle reduced from the original approximately 70° to below 30°.

[0037] Drug-loaded hemp thread vacuum impregnation loading: First, accurately weigh berberine and paeonol, dissolve them in anhydrous ethanol at a mass ratio of 1:1.8, and then prepare a homogeneous drug-loaded solution with a total concentration of 3% (w / v) by ultrasonic dispersion. The drug-loaded hemp thread is loosely coiled in a specially made impregnation basket and placed in a vacuum impregnation tank; After pouring in the drug-loaded solution, seal the tank and start the vacuum pump to slowly reduce the pressure inside the tank to -0.08 MPa and maintain it thereafter. Under this negative pressure environment, the air inside the hemp thread and between the fibers is forced out, and the liquid medicine can deeply and quickly fill all the pores of the hemp thread under the pressure difference. The impregnation tank was placed in a 50°C constant temperature water bath for 2 hours to promote the diffusion and adsorption of drug molecules into the amorphous region of the fiber. After impregnation, the hemp thread was removed and allowed to air dry naturally in a dark, well-ventilated place until it reached a constant weight. Through precise weighing and calculation before and after impregnation, the effective drug loading reached 2.2% of the dry weight of the hemp thread.

[0038] Construction of conductive coating on sensing hemp fibers: A carbon nanotube dispersion and an aqueous polyurethane emulsion were mixed at a mass ratio of 1:4 and then ultrasonically treated with a probe for 30 minutes to obtain a conductive coating with uniform dispersion and suitable viscosity. A precision dip-pull machine is used, with the pulling speed set at 50 mm / min. The sensing hemp thread is pulled vertically and at a uniform speed through the coating liquid surface, and a uniform liquid film is formed by relying on the surface tension of the liquid and gravity. Then, it is cured in an 80°C circulating hot air oven for 30 minutes to allow the polyurethane to form a film and firmly lock the CNT network onto the surface of the hemp thread; The sheet resistance of the coating was measured to be approximately 800 Ω / sq using a four-probe tester. SEM observation showed that the coating was continuous, uniform in thickness (approximately 20 μm), and tightly bonded to the hemp fibers without cracking or peeling.

[0039] Biomimetic mineralization enhancement interface on hemp fiber surface: To fundamentally solve the problem of weak interfacial adhesion between natural hemp thread and hydrophobic plastic matrix, all hemp threads (including basic hemp thread) are subjected to biomimetic mineralization treatment. The hemp thread was immersed in freshly prepared 10×SBF simulated body fluid and placed in a constant temperature shaker at 37℃ (simulating human body temperature) for continuous shaking at 100 rpm for 36 hours. In this biomimetic environment, calcium ions (Ca²⁺) and carbonate ions (CO3²⁻) in the solution undergo heterogeneous nucleation and slow growth under the induction of abundant polar groups (such as hydroxyl and carboxyl groups) on the surface of hemp fibers, forming a layer of nanoscale calcium carbonate (CaCO3) crystals. After mineralization, the hemp thread was rinsed with plenty of deionized water until neutral and then dried at low temperature. SEM combined with energy dispersive spectroscopy (SEM-EDS) confirmed that a dense and uniform layer of nano-calcium carbonate crystals was successfully deposited on the surface of the hemp thread, with a coverage of approximately 92%. This mineralized layer not only mechanically bonds the twine to the subsequent molten plastic, but its surface polarity also allows for stronger chemical interactions with the compatibilizer (MAPE) in the plastic.

[0040] Based on the nano-calcium carbonate (CaCO3) crystal layer formed by biomimetic mineralization in S100, the interfacial adhesion between all the hemp fibers and the wood-plastic particles in the subsequent S400 is enhanced, which is the basis for achieving a high-strength structure. Moreover, the mineralization treatment is completed before S200, which makes the hemp fibers with slightly improved rigidity less prone to wear and fraying during the weaving process, ensuring the accuracy of the three-dimensional skeleton dimensions and the stability of the functional hemp fiber weaving path, thereby indirectly ensuring the positional accuracy of the final functional network.

[0041] S200: Precise weaving of a three-dimensional skeleton and integration of multiple spatial functions. Process Principle and Operation Flow: Using mineralized base hemp yarn as "warp" and "weft," parameters are set on a three-dimensional orthogonal weaving machine (warp density 8 yarns / cm, weft density 8 yarns / cm, interlayer spacing 4.0 mm) to weave a three-dimensional mesh skeleton with a predetermined size (300×300×10mm) and porosity (68.0%). Simultaneously, through the multi-axis auxiliary yarn guiding system integrated into the equipment, the pre-treated functional hemp yarn is woven in online, synchronously, and in a pre-set program.

[0042] Basic skeleton weaving: The basic hemp yarn that has been surface mineralized is used as the warp and weft yarns and is fed into a three-dimensional orthogonal weaving machine to guide the two types of hemp yarns to the Z direction (vertical direction).

[0043] The core process parameters are set as follows: warp density is 8 yarns / cm, weft density is 8 yarns / cm, and interlayer spacing is fixed at 4.0mm, forming a longitudinal functional channel network that runs through the board.

[0044] The equipment is started and automatically weaves according to the preset program, eventually forming a three-dimensional network skeleton prefabricated body with an outer dimension of 300mm (length) × 300mm (width) × 10.0mm (thickness). The sensing hemp wire is guided to a specific XY plane in the middle of the plate thickness, and its path is controlled by programming to form a regular square resistance sensing grid with a side length of 25.0 mm.

[0045] The volume and apparent density of the skeleton were accurately measured using the Archimedes displacement method, and the porosity of the skeleton was calculated to be 68.0%. This porous structure provides an ideal channel for subsequent melt penetration.

[0046] Synchronization and positioning integration of functional hemp yarn: While the knitting host is running, the multi-axis auxiliary yarn guiding system integrated into the equipment is activated to realize the online knitting of functional hemp yarn.

[0047] Water / medication channel construction: The pretreated water-carrying hemp yarn and drug-carrying hemp yarn are guided to the vertical (Z-direction) yarn system position of the braided structure through independent yarn guides.

[0048] According to the design procedure, the fibers are woven into the vertical channels of the skeleton synchronously and at equal intervals with a precise distribution density of 8 fibers per 10 cm².

[0049] These vertically arranged functional hemp fibers will form a longitudinal backbone network for capillary water transport and sustained drug release in the final product.

[0050] Sensor grid layout: The sensor wires coated with conductive coating are guided to specific horizontal (XY plane) layers inside the skeleton.

[0051] The weaving path is programmed to form a regular square grid with sides of 25.0 mm in the middle layer along the thickness direction of the plate. This grid constitutes an embedded distributed resistance sensing network, which can be used in the future to monitor strain distribution and damage location on the plate surface.

[0052] Integrated quality inspection: After weaving is completed, a high-precision three-dimensional coordinate measuring instrument is used to measure the coordinates of 100 key nodes of the functional hemp thread that are pre-marked inside the skeleton.

[0053] Statistical analysis results show that the deviation of all functional hemp thread nodes from their theoretical positions in the 3D design model is ≤±1.2 mm. This enables high-precision integration and positioning of four functions—structural load-bearing, moisture transport, drug release, and state sensing—in 3D space, forming a multifunctional composite prefabricated structure with integrated structure and function.

[0054] S300, efficient homogenization preparation of wood-plastic composite materials: Process Principle and Operation Flow: Materials are strictly proportioned according to the mass ratio (HDPE:poplar wood powder:MAPE:antioxidant = 100:50:5.0:0.4), premixed in a high-speed mixer, and then fed into a twin-screw extruder. A temperature gradient (150°C→180°C) is set from the feed inlet to the die head, causing the material to undergo solid conveying, melting, mixing, and homogenization processes. A vacuum devolatilization port (-0.07 MPa) is set in the melt homogenization section to remove moisture and volatiles. The melt is then water-cooled and pelletized to obtain wood-plastic composite pellets.

[0055] Precise metering and premixing of raw materials: According to the mass ratio of HDPE:poplar wood powder:MAPE:antioxidant compound = 100:50:5.0:0.4, each component was weighed one by one using a precision electronic balance.

[0056] Add all raw materials into the high-speed mixer (SHR-10A) at once, set the speed to 800 r / min, and the mixing time to 10 minutes.

[0057] This process allows the wood-plastic composite granules with significant differences in specific gravity to be initially and evenly mixed with the wood powder, and creates stable feeding conditions for subsequent melt extrusion.

[0058] Melt blending, shear dispersion and vacuum dehydration: The premixed material is stably fed into a co-rotating parallel twin-screw extruder through a loss-in-weight feeder; The main screw speed is set to 200 r / min, and the feeding rate is calculated and set to 14.0 kg / h based on the screw volume to maintain a stable material filling rate and shear history. The extruder has five independent heating zones with precise control: Zone 1 (solid conveying section) 150℃, Zone 2 (melting section) 165℃, Zone 3 (melt conveying and mixing section) 170℃, Zone 4 (high shear mixing section) 175℃, and Zone 5 (homogenization and pressure building section) 180℃.

[0059] A vacuum devolatilization port is installed at the rear of the fourth zone, connected to a vacuum pump, and the vacuum level in this section is maintained at -0.07 MPa. Under this vacuum environment, residual moisture in the wood flour, low-molecular-weight volatiles in the plastic, and small molecules generated by the reaction are efficiently removed, which can effectively prevent the formation of bubbles in the final product and improve the interfacial bonding strength.

[0060] Cooling and granulation: The homogenized wood-plastic melt is extruded in a cylindrical shape from the die head and immediately enters a 20°C cooling water bath for rapid cooling and solidification to prevent material oxidation and performance degradation.

[0061] After cooling, the material strips are fed into a pelletizer by a traction machine and cut into cylindrical pellets with a specification of approximately φ3mm×3mm.

[0062] Random samples were dried to constant weight at 105℃ and measured. The moisture content of the granules was ≤0.09%, indicating that the dehydration effect was significant and that wood-plastic composite granules with uniform performance and extremely low moisture content were successfully obtained.

[0063] S400, melt injection molding composite molding: Process Principle and Operation Flow: Dry wood-plastic composite granules and a dried multi-functional hemp fiber skeleton preform are placed together in a preheated mold (80±2°C). Under an injection pressure of 12.0 MPa, the 180°C molten wood-plastic composite is injected into the cavity at high speed, and under pressure, it is forcibly penetrated into every pore of the skeleton (porosity 68.0%). After holding the pressure, the mold is opened and the part is removed.

[0064] Mold and preform preparation: Install the designed flat mold onto the injection molding machine template and turn on the mold temperature control system to preheat the moving and fixed molds evenly to 80±2℃.

[0065] The multifunctional composite preform made by S200 is carefully placed into the mold cavity, ensuring that it is flat, without warping, and with sufficient space for melt flow channels around it.

[0066] Injection molding and pore filling: Add the wood-plastic composite granules obtained from S300 to the hopper of the injection molding machine.

[0067] The barrel heating temperature is set to 180℃, and the screw rotation and shearing process remelts and plasticizes the material.

[0068] The injection pressure was set to 12.0 MPa, and an injection speed curve of slow first, then fast, and then holding pressure was adopted.

[0069] During injection, the high-temperature (180℃) and high-pressure (12 MPa) wood-plastic melt is injected at high speed from the mold gate, quickly filling the cavity, and under the strong pressure, it penetrates into the three-dimensional network structure of the hemp fiber skeleton with a porosity of up to 68% from all directions.

[0070] Cooling and shaping and non-destructive testing: After injection and pressure holding, 15°C cooling water is introduced to rapidly cool the mold.

[0071] When the temperature of the product inside the mold cools to below 60°C (below the softening point of HDPE), the mold is opened and the molded blank is removed. To visually verify the composite effect, a small sample is cut from the blank and scanned using a high-resolution X-ray microscopy system.

[0072] The 3D reconstructed images clearly show that the wood-plastic composite melt has almost completely filled all the pores of the hemp fiber skeleton (including the fiber bundles and the intersections of warp and weft yarns), with a filling rate of more than 99%. The interface between the hemp fiber and the wood-plastic composite matrix is ​​clear and tightly bonded, with no visible defects such as debonding or pores.

[0073] This indicates that a dense composite structure with a three-dimensional hemp fiber network as continuous reinforcing ribs and wood-plastic composite as the matrix has been successfully prepared, namely, a structural and functional integrated substrate.

[0074] S500, Post-processing and Smart Ecosystem Packaging: High-precision dimensional cutting: The shaped substrate is fixed on the worktable of the CNC cutting platform, and a diamond-coated alloy saw blade is used as the cutting tool.

[0075] Input the designed final product size program (e.g., 295mm×295mm), and start the equipment for automatic cutting.

[0076] Water cooling can be used to reduce temperature and suppress dust during the cutting process.

[0077] After cutting, a digital caliper is used for multi-point inspection to control the dimensional accuracy within ±0.4mm, resulting in a smooth cut.

[0078] Intelligent sensing system connection: Multiple conductive hemp wire terminals pre-leading out from the edge of the substrate and corresponding to the horizontal sensing grid are plugged into and connected to a custom-developed micro monitoring module.

[0079] The core of the miniature monitoring module is a PCB board integrating a high-precision digital temperature and humidity sensor, a strain conditioning circuit (based on the Wheatstone bridge principle), and a microcontroller. The sampling frequency can be set between 1-10Hz via software. Before the board leaves the factory, sensor calibration is required: a known load is applied to the finished board, and the resistance change value of the sensing grid is recorded. The microprocessor stores the calibration coefficient of this resistance change value. During real-time monitoring, the strain distribution cloud map is calculated and output based on the collected resistance values. Temperature and humidity monitoring is achieved directly through the digital sensor integrated on the module.

[0080] The connections use IP67-rated waterproof seals to ensure long-term reliability in humid outdoor environments.

[0081] Ecological water supply interface integration: Use a hole puncher to machine a mounting hole of matching diameter at a designated location on the side of the substrate design.

[0082] Insert a 5mm inner diameter quick-connect PE pipe fitting (compliant with GB / T standards) into the hole. Fit a food-grade silicone O-ring onto the end of the fitting, then screw or press it into the plate until the O-ring is tightly pressed against the outlet face of the pre-embedded water delivery hemp thread, forming a leak-proof seal. This interface allows for quick connection to an external drip irrigation system or water storage container.

[0083] Finally, the integrated sheet is transferred to the co-extrusion production line.

[0084] The substrate flows into the co-extrusion die as the main extrusion, while the ASA (acrylonitrile-styrene-acrylate copolymer) resin is plasticized in a separate extruder.

[0085] The co-extrusion die head flow channel temperature is set to 200℃ and the extrusion back pressure is set to 10.0MPa.

[0086] Results, performance and comprehensive validation: Core mechanical properties: Tested according to the standard GB / T 29418-2012 Physical and mechanical properties test of wood-plastic composite products.

[0087] The finished wall panel has a longitudinal bending strength of 42.3 MPa and a bending modulus of elasticity of 3.8 GPa.

[0088] The nail-holding force was tested according to the ASTM D1037 Standard Test Method for Performance of Wood-based Panels. The results showed that its nail-holding force reached 85% of that of high-quality pine solid wood boards of the same thickness, which fully meets the load-bearing requirements of wall hangings, installation joists, etc.

[0089] Empirical evidence of ecological function: Capillary water transport efficiency: The wall panel is placed vertically, and its bottom water supply interface is connected to a static pressure water source that maintains a constant water head of 5cm.

[0090] Through observation and weighing, it was found that within 24 hours, water was evenly diffused throughout the entire 300mm×300mm board surface area by capillary action through the hydrophilic hemp network inside the board, indicating that it has the potential to provide a stable and uniform passive water supply for vertical greening plants.

[0091] Long-lasting anti-mildew verification: Referring to GB / T 24128-2018 Test method for anti-mildew performance of plastics, the drug-loaded wall panel sample and the control sample were placed in an environment of mixed spore suspension of Aspergillus niger, Penicillium cordifolium and other fungi for 28 days.

[0092] After cultivation, microscopic observation showed that a clear and continuous antibacterial zone was formed around the drug-loaded hemp thread area, with a diameter greater than 10 mm, proving that the loaded berberine and paeonol compound had a significant and long-lasting antifungal effect.

[0093] Intelligent monitoring function: When the miniature monitoring module is powered on, a simulated load is applied. The module can stably collect and wirelessly transmit the surface strain data of the plate. After calibration, its strain monitoring accuracy can reach ±5 micro-strain (με). At the same time, it can provide real-time feedback of temperature and humidity readings in different areas within the plate. The function is stable.

[0094] Process stability verification: Under the same equipment, raw materials and process parameters, three complete preparation experiments were independently repeated.

[0095] Performance statistics were performed on three batches of finished products: the flexural strength values ​​were 42.3 MPa, 41.8 MPa, and 42.7 MPa, respectively, with a fluctuation range of less than 5%. Randomly sampled the actual position of the functional hemp thread within the board, and its maximum deviation from the designed position remained consistently within the design tolerance range of ±1.5mm.

[0096] More specifically, based on the technical variables optimized and applied in Examples 2 to 6: Extended technical variable optimization and application expansion 1: Example 2: High-strength weather-resistant wall panel (for outdoor high-load scenarios) Optimization goals: Improve mechanical strength, water resistance, and long-term weather resistance, suitable for building exterior walls and load-bearing landscape components.

[0097] Matrix reinforcement: The matrix resin was replaced with polypropylene (PP, grade T30S), which has better rigidity and heat resistance. 80-mesh red pine wood powder with longer fibers was used, and the PP to wood powder mass ratio was adjusted to 60:40.

[0098] The amount of compatibilizer MAPE was increased to 6%, and an additional 1% of silane coupling agent KH-550 was added to pretreat the wood flour.

[0099] Skeleton reinforcement: The fineness of the base hemp thread was increased to 1200 microns. In 3D weaving, figure-eight sutures were added in the programming to strengthen interlayer connections. The target porosity was fine-tuned to 65%.

[0100] Surface upgrade: The co-extruded protective layer is now made of PMMA, which has higher weather resistance and hardness, and the thickness is increased to 0.7mm.

[0101] Process adjustments: S300 extrusion temperature increased to 160 / 175 / 180 / 185 / 190℃ (zones 1 to 5); S400 injection temperature increased to 190℃, and pressure increased to 14MPa.

[0102] Verification results: The finished product has a flexural strength of 58 MPa, a modulus of 4.5 GPa, and a water absorption rate of <0.8% after 24 hours. After 500 hours of xenon lamp aging, the color difference ΔE <2, and the strength retention rate >90%.

[0103] The second extension of technical variable optimization and application expansion: Example 3: Intelligent Response Wall Panel (Integrated Sensing and Micro-Actuation) Optimization goal: To achieve a leap from "sensing" to "active response" and explore adaptive structural materials.

[0104] Key changes: Advanced sensing: Some sensing wires are replaced with flexible optical fibers with built-in fiber optic grating (FBG) arrays, coated with a fluorescent dye protective layer and then incorporated to achieve monitoring accuracy of ±0.5℃ and ±2με.

[0105] Drive element: Fine-diameter shape memory alloy (SMA) wires are pre-woven into mechanically sensitive areas.

[0106] Control upgrade: The monitoring module integrates a microprocessor, which can analyze strain distribution and control current to trigger the SMA wire.

[0107] Functional verification: In the wind tunnel simulation experiment, after the system was triggered, the SMA wire contraction generated prestress compensation in the local area, reducing the maximum deflection of the wall panel by about 15%.

[0108] The third extension of technical variable optimization and application expansion: Example 4: Rapid prototyping and low-cost wall panels (process simplification and efficiency improvement) Optimization goal: To significantly reduce costs and production cycles, suitable for the large-scale general landscape market.

[0109] Key changes: Simplified materials: Recycled HDPE and cedar wood powder are used. All sensing twine and monitoring modules are omitted.

[0110] Technological revolution: Combining S200 and S400 into a "one-step molding process." The woven skeleton and wood-plastic composite dry compound are directly laid into the hot press mold.

[0111] Parameters: Hot pressing temperature 175℃, pressure 15MPa, time calculated at 1.5min / mm thickness.

[0112] Verification results: Production cycle shortened by approximately 40%, raw material costs reduced by approximately 30%. The product has a flexural strength of approximately 35 MPa, retains complete water delivery and mildew prevention functions, and meets general application requirements.

[0113] The fourth extension of technical variable optimization and application expansion: Example 5: Ultralightweight Sandwich Wall Panel (Extreme Lightweight Design) Optimization goal: To achieve extreme lightweight design for use in exhibitions, temporary buildings, etc.

[0114] Key changes: Structural innovation: A "skin-core-skin" sandwich structure is adopted. The core layer is a three-dimensional truss woven from hemp thread (porosity > 85%); the skin is a 2-3mm thin plate made using the process described in Example 1.

[0115] Composite process: The core layer is sandwiched between two skin sheets and hot-pressed to form a composite.

[0116] Verification results: The final product's density can be as low as 0.4 g / cm³, more than 50% lighter than solid boards, but with extremely high specific stiffness (stiffness / weight). The skin retains its ecological functions, and the core cavity facilitates wiring or the filling of insulation materials.

[0117] The fifth extension of technical variable optimization and application expansion: Example 6: Full Life Cycle Ecological Wall Panel System (Ultimate Integrated Demonstration) Optimization goal: Integrate the aforementioned technologies to construct a complete, intelligent, and self-sustaining ecological building module.

[0118] System Integration: The wall panel of Example 2 is used as the main structural component.

[0119] The FBG sensor network and intelligent control unit of embodiment three are integrated.

[0120] Retain and optimize the water delivery and drug-carrying hemp cable network.

[0121] The wall panel surface is molded into an integrated planting trough and irrigation microchannel.

[0122] System Operation: The system automatically monitors soil moisture and controls water supply, monitors structural health and issues early warnings, uses medicated hemp threads to protect plants, and transmits all data wirelessly. This represents a leap from materials to ecosystems, showcasing the high-end application value of technology in green buildings and smart cities.

[0123] By leveraging the scalability from material design and structural manufacturing to system integration, this invention can meet diverse and personalized needs ranging from ordinary landscapes to high-end intelligent buildings.

[0124] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing a structural and functional integrated intelligent ecological plastic-wood board, characterized in that, The specific steps of the method are: S100, functional hemp line pretreatment: the hemp line is divided into three categories for processing, the water conveying hemp line is hydrophilic modified, the drug carrying hemp line is immersed in natural extract for driving insects and preventing mildew, the sensing hemp line is coated with conductive / light sensitive coating, and all the base hemp lines are surface nano-mineralized to improve the interface adhesion. S200, three-dimensional skeleton weaving and integration: using the base hemp line as the warp and weft, a three-dimensional network skeleton with a predetermined porosity is made by a mechanical weaving process. In the weaving process, the pretreated water conveying hemp line, the drug carrying hemp line and the sensing hemp line are simultaneously woven into the designated three-dimensional space position of the skeleton according to the design path to form a multifunctional composite preform; S300, plastic-wood melt preparation: plastic particles, wood powder and compatibility agent, antioxidant are mixed in proportion, fed into a double screw extruder, extruded into a co-extrusion mold, and cooled with water to form a uniform plastic-wood granule; S400, extrusion composite molding: the multifunctional composite preform is placed in a molding mold, and the plastic-wood granule is injected into the mold under pressure to make it fully penetrate and fill all the pores of the three-dimensional skeleton, and then it is shaped by extrusion to form a substrate with hemp line network as the reinforcing rib; S500, post-processing and system packaging: the formed substrate is cut to size, the in-board sensing hemp line network of the substrate is connected to a micro monitoring module, and a water supply interface is integrated on the side of the board body, and finally a surface co-extrusion treatment is performed to obtain a plastic-wood board product with integrated structure reinforcement, ecological maintenance and intelligent monitoring.

2. The preparation method of the intelligent ecological plastic-wood board with structural and functional integration according to claim 1, characterized in that, In the S100, functional hemp line pretreatment, the hydrophilic modifier used for the water conveying hemp line is chitosan acetic acid solution or polyvinyl alcohol solution; the natural extract immersed in the drug carrying hemp line is one or several of berberine, paeonol, cnidim and azadirachtin; the conductive coating coated on the sensing hemp line is carbon nanotube dispersion, graphene slurry or PEDOT:PSS, and the light sensitive coating is a light curing resin doped with fluorescent dye; the surface nano-mineralization treatment is biomimetic deposition of nano calcium carbonate or nano silicon dioxide.

3. The method according to claim 1, wherein the method is characterized by, The S100, in the function of hemp line pretreatment, the natural extract of drug-loaded hemp line immersion is the compound of berberine and paeonol with mass ratio of 1:1.5 to 1:2, the square resistance range of the carbon nanotube / water-based polyurethane conductive coating coated by the sensing hemp line is 10 4 Ω / sq, the coating thickness is 10-30 μm, the simulated body fluid used in the biomimetic mineralization treatment is 10 times concentrated SBF solution, and the coverage of the crystal layer on the hemp line surface after mineralization is ≥90%.

4. The preparation method of the intelligent ecological plastic-wood board with structural and functional integration according to claim 1, characterized in that, In the S100, functional hemp line pretreatment, the hydrophilic modification treatment temperature is 40-80℃, the treatment time is 0.5-2 hours, the drug carrying immersion is carried out at 25-60℃ and a vacuum degree of-0.05 to-0.1MPa, the immersion time is 1-4 hours, the sensing coating coating adopts dip-coating method, the pulling speed is 10-100mm / min, the coating is cured at 60-120℃ for 10-60 minutes, and the nano-mineralization treatment is carried out in a constant temperature oscillator at a temperature of 25-40℃ and a vibration frequency of 50-150rpm.

5. The method according to claim 1, wherein the method is characterized by, In the S200, three-dimensional skeleton weaving and integration, the porosity of the three-dimensional network skeleton is 60%-80%, the fineness of the base hemp line is 600-1500 denier, and the thickness of the single layer skeleton formed by weaving is 3-8mm, and the interlayer is connected by 8-shaped wiring of the base hemp line.

6. The method for preparing a structural and functional integration intelligent ecological plastic-wood board according to claim 1, characterized in that, In the S200, the water delivery yarns are arranged in a vertical direction with a distribution density of 5-12 roots per 100 cm2, and the sensing yarns are arranged in a horizontal grid to form a monitoring unit, with a grid side length of 20-50 mm. After weaving, the position deviation of each functional yarn in the framework is not more than ±1.5 mm of the designed position.

7. The method according to claim 1, wherein the method is characterized by, In the S300, the plastic particles are high-density polyethylene or polypropylene, the wood powder is poplar powder or pine powder with a mesh size of 60-100, and the mass ratio of the two is 50:50 to 70:

30. The compatible agent is maleic anhydride grafted polyethylene, and the addition amount is 3%-6% of the total mass of the plastic and wood powder. The antioxidant is a compound of tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester and tri(2,4-di-tert-butylphenyl) phosphite, and the total addition amount is 0.3%-0.5% of the total mass of the plastic and wood powder.

8. The method according to claim 1, wherein the method is characterized by, In the S300, the screw length-diameter ratio of the double-screw extruder is 36:1 to 44:1, the main screw rotation speed is 180-220 r / min, the ratio of feeding rate to screw rotation speed is 0.6-0.8 kg / h / (r / min), and the temperature control of each zone is as follows: the feeding zone I is 145-155℃, the melting zone II is 160-170℃, the mixing zone III is 165-175℃, the homogenization zone IV is 170-180℃, and the die zone V is 175-185℃. The vacuum degree of the vacuum devolatilization section is maintained at -0.06 to -0.08 MPa, and the water content of the plastic-wood granules after dehydration kneading is ≤0.1%.

9. The method according to claim 1, wherein the method is characterized by, In the S500, the sizing cutting uses a water jet or a numerical control saw blade with a diamond coating, with a cutting accuracy of ±0.5 mm. The micro monitoring module integrates temperature and humidity, strain, and resistance measurement units, and is connected to the sensing yarn network through a waterproof plug connector. The data sampling frequency is 1-10 Hz. The water supply interface is a quick plug PE pipe joint with an inner diameter of 4-6 mm, which is connected to the main water delivery yarn channel pre-buried in the plate body through a sealing rubber ring.

10. The method for preparing a structural and functional integration intelligent ecological plastic-wood board according to claim 1, characterized in that, In the S500, the surface co-extrusion process uses an independent co-extrusion die head, with a co-extrusion temperature of 190-210℃ and an extrusion pressure of 8-12 MPa.

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