Preparation method of indoor anti-corrosion ecological board

Abstract

The invention relates to artificial board processing, in particular to a preparation method of an indoor anti-corrosion ecological board. The preparation method comprises the following steps: step a, adding toluene diisocynate, polyether polyol and dimethylolpropionic acid, heating in a water bath, and stirring; step b, reducing the water bath temperature, adding triethylamine, and stirring to generate a prepolymer; step c, further reducing the temperature of the water bath, adding deionized water and tebuconazole in the stirring process, adding ethylenediamine after the prepolymer is completely dispersed in the water, and stirring for a time period; step d, coating the prepared waterborne polyurethane on the veneers, and assembling the veneers after gluing; e, cold pressing is conducted, specifically, the combined plate blanks are subjected to cold pressing; and f, hot pressing is conducted, specifically, the plate blank obtained after cold pressing forming is subjected to hot pressing. Waterborne polyurethane synthesis and tebuconazole corrosion prevention modification are integrated, segmented temperature control and segmented forming are coordinated, and unification of the three properties of indoor ecological board cementing, corrosion prevention and environmental protection is achieved.

Description

Technical Field

[0001] This invention relates to the field of engineered wood processing and manufacturing technology, and in particular to a method for preparing an indoor anti-corrosion and eco-friendly board. Background Technology

[0002] Eco-friendly boards are generally produced using urea-formaldehyde resin or melamine-modified urea-formaldehyde resin as adhesives. Their application is somewhat limited, typically used in dry environments such as bedrooms and living rooms. In high-humidity environments, such as kitchens and bathrooms, the edges of the boards are prone to mold and delamination, restricting their use in home decoration.

[0003] To enhance the application of eco-friendly boards in home decoration and address issues such as mold and delamination, a method for preparing indoor anti-corrosion eco-friendly boards is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing an indoor anti-corrosion ecological board.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A method for preparing an indoor anti-corrosion ecological board includes the following steps: Step a, Prepolymer backbone preparation: Add toluene diisocyanate, polyether polyol, and dimethylolpropionic acid, heat in a water bath, and stir; Step b, prepolymer preparation: Lower the water bath temperature, add triethylamine, stir, and generate prepolymer; Step c, water dispersion and modification: further reduce the water bath temperature, and add deionized water and tebuconazole during stirring. After the prepolymer is completely dispersed in water, add ethylenediamine and stir for a period of time. Step d, veneer coating and assembly: The prepared water-based polyurethane is coated on the veneer, and the veneers are then assembled after the coating is applied. Step e, cold pressing: The assembled slab is cold pressed; Step f, hot pressing: The cold-pressed slab is hot-pressed.

[0006] The inventors believe that the application scenarios of existing ecological boards in the home decoration field are relatively limited. The main reasons are (1) the urea-formaldehyde resin adhesive or melamine-modified urea-formaldehyde resin adhesive used are Class III adhesives and do not have strong water resistance; (2) as a biomass material, wood is susceptible to microbial invasion and mold growth in high humidity environments, which affects the use of the product.

[0007] Compared to the traditional segmented process of "preparing the adhesive, mixing the chemicals, and then applying the adhesive," this invention enables the anti-corrosion components to be more evenly dispersed and more stably bonded within the polyurethane dispersion system, achieving a synergistic improvement in adhesive strength and anti-corrosion performance at the molecular structure level. From the perspectives of reaction kinetics and molecular structure design, the method ensures controllable resin molecular weight, crosslinking degree, and hydrophilic-oleophilic balance, providing a stable structural foundation for subsequent bonding and anti-corrosion. This invention integrates waterborne polyurethane synthesis, tebuconazole functionalization, veneer adhesive application and assembly, and cold-pressing-hot-pressing molding into a continuous process. The polyurethane adhesive layer serves both as the adhesive matrix for the board and as a slow-release carrier for tebuconazole, further curing and crosslinking during hot pressing to form a dense, water-resistant, and long-lasting anti-corrosion interface layer. Theoretically, this achieves a unity of bonding performance, anti-corrosion performance, and dimensional stability, overcoming the problem of "two mutually exclusive structures and properties" between the adhesive layer and the anti-corrosion layer in traditional anti-corrosion boards. First, cold pressing allows the adhesive to fully wet and penetrate the veneer interface, then hot pressing promotes the curing of polyurethane and the uniform distribution of tebuconazole, which helps to improve the strength of the adhesive layer, reduce bubbling and deformation, and extend the anti-corrosion effect. Theoretically, this improves the weather resistance, water resistance, mildew and corrosion resistance life of the ecological board.

[0008] The production method of this invention uses waterborne polyurethane, achieving a bonding strength of Class I, which allows for application in high-humidity environments and avoids delamination due to excessive moisture. Furthermore, this invention adds tebuconazole as a preservative to the waterborne polyurethane, achieving a durability grade of C 3.1, allowing for application in high-humidity environments and preventing board decay and mold growth due to moisture.

[0009] As a preferred embodiment, step a, the preparation of the prepolymer framework, specifically includes: adding toluene diisocyanate, polyether polyol, and dimethylolpropionic acid to a reaction vessel, heating in a water bath to 80-100°C, and stirring for 50-90 minutes.

[0010] As a preferred embodiment, step b, the preparation of the prepolymer, specifically includes: lowering the water bath temperature to 50-70°C, adding triethylamine, stirring for 80-100 minutes to generate the prepolymer; As a preferred embodiment, step c, water dispersion and modification, specifically includes: further reducing the water bath temperature to 25-35℃, while adding deionized water and tebuconazole during stirring, and adding ethylenediamine after the prepolymer is completely dispersed in water, with stirring time of 50-70 minutes.

[0011] This method utilizes a synergistic design of in-situ composite of waterborne polyurethane with tebuconazole and segmented reaction-segmented pressure molding to complete resin synthesis, anti-corrosion modification, board bonding and molding in a single process. This achieves a unified approach to indoor ecological boards, combining high bonding strength, long-lasting anti-corrosion properties and environmental friendliness from both molecular structure and preparation process perspectives.

[0012] As a preferred embodiment, in step a, the prepolymer skeleton is prepared by adding toluene diisocyanate, polyether polyol, and dimethylolpropionic acid to a reaction vessel, heating to 90°C in a water bath, and stirring for 70 min. Step b: Prepolymer preparation. Lower the water bath temperature to 60°C, add triethylamine, and stir for 90 min to generate the prepolymer. Step c: Water dispersion and modification. Lower the water bath temperature to 30°C. At the same time, add deionized water and tebuconazole during stirring. After the prepolymer is completely dispersed in water, add ethylenediamine and stir for 60 minutes.

[0013] The innovation of this invention lies in: 1. Stepped temperature control process design achieves precise and controllable prepolymer structure and improves system stability: The scheme adopts a three-stage precise temperature control strategy of "90℃ prepolymerization → 60℃ neutralization → 30℃ dispersion and chain extension". This is not a simple temperature adjustment, but a design that combines the reaction characteristics of each reaction stage to adapt the temperature and time parameters. Heating and stirring in a 90℃ water bath for 70 minutes ensures that toluene diisocyanate reacts fully with polyether polyol and dimethylolpropionic acid to build a stable polyurethane skeleton and avoids uneven molecular weight distribution caused by incomplete reaction. Adding triethylamine at 60℃ and stirring for 90 minutes can not only achieve full neutralization of the carboxyl groups of dimethylolpropionic acid, giving the prepolymer good hydrophilicity, but also avoid the volatilization or side reactions of triethylamine caused by high temperature. Water dispersion and chain extension at a low temperature of 30℃ can prevent the reaction between ethylenediamine and isocyanate groups from being too violent, and at the same time avoid the decomposition of tebuconazole at high temperature. From the perspective of reaction kinetics, this ensures the uniformity of the prepolymer structure and the stability of the system, breaking through the limitations of traditional processes with rough temperature control and many side reactions.

[0014] 2. In-situ integration of anti-corrosion function and resin synthesis enhances the longevity and uniformity of anti-corrosion effect: The innovative solution introduces tebuconazole (the anti-corrosion functional component) into the water dispersion and chain extension stage of waterborne polyurethane, rather than the traditional segmented approach of "synthesizing resin first and then adding the anti-corrosion component." Under stirring conditions at 30℃, tebuconazole is added along with deionized water. The shear force generated during the prepolymer dispersion process ensures uniform dispersion of the anti-corrosion component within the polyurethane system. Subsequent addition of ethylenediamine for chain extension allows the network structure formed by the cross-linking of polyurethane molecular chains to stably encapsulate the tebuconazole, making it an integral part of the resin system rather than a simple physical mixture. This in-situ composite method solves the problems of uneven dispersion, easy migration, and easy loss of the anti-corrosion component in traditional processes, achieving a one-step completion of "resin synthesis-anti-corrosion loading." This ensures both long-lasting anti-corrosion effect and avoids the negative impact of the anti-corrosion component on resin bonding and film-forming properties, achieving a synergistic improvement in both function and performance.

[0015] Preferably, the mass ratio of the polyether polyol to toluene diisocyanate is 1:(0.4-0.6).

[0016] The mass ratio of polyether polyol to toluene diisocyanate is controlled at 1:(0.4-0.6), which can precisely control the ratio of isocyanate groups to hydroxyl groups in the polyurethane molecular chain, ensuring that the prepolymer has a suitable molecular weight and degree of crosslinking, and taking into account both the stability of the system and the subsequent film-forming performance.

[0017] Preferably, the mass ratio of the polyether polyol to dimethylolpropionic acid is 100:(8-10).

[0018] The mass ratio of polyether polyol to dimethylolpropionic acid is 100:(8-10), which can reasonably control the content of hydrophilic groups in the resin molecule, so that the prepolymer can achieve self-emulsification and dispersion, and will not reduce water resistance due to excessive hydrophilic groups.

[0019] Preferably, the triethylamine is 6.79 parts, the ethylenediamine is 2.10 parts, the deionized water is 351 parts, and the tebuconazole is 3-5 parts.

[0020] The specific dosages of triethylamine, ethylenediamine, deionized water, and tebuconazole in this invention ensure the full progress of the neutralization and chain extension reactions, while also maximizing the preservative effect of tebuconazole. Simultaneously, it controls production costs and avoids component waste, overcoming the problems of vague proportions and large performance fluctuations in traditional solutions, thus achieving the dual goals of "performance meeting standards and cost control."

[0021] Preferably, step d, veneer coating and assembly, includes coating the prepared waterborne polyurethane onto the veneer with a single-sided coating amount of 160-185 g / m², and then assembling the veneer after coating.

[0022] More preferably, step d, single-layer coating and assembly, includes coating the prepared waterborne polyurethane onto the single-layer with a single-sided coating amount of 175 g / m², and assembling the single-layer after coating.

[0023] Preferably, step e, cold pressing, includes cold pressing the assembled slab, with a unit pressure of 0.7-0.9 MPa and a time of 1.5-2.5 h.

[0024] This method integrates waterborne polyurethane synthesis with tebuconazole anti-corrosion modification, and coordinates segmented temperature control and segmented molding. Based on a waterborne system, it achieves the unification of the three major properties of indoor ecological boards—adhesion, anti-corrosion, and environmental protection—especially through the control of cold and hot pressing.

[0025] More preferably, step e, cold pressing, includes cold pressing the assembled slab, with a unit pressure of 0.8 MPa and a time of 2 hours.

[0026] During cold pressing, this invention employs a specific cold pressing forming device for ecological boards, including a support platform and a frame. The frame is located above the support platform, and a pressing mechanism is installed on the frame. A pressure plate is installed at the bottom output end of the pressing mechanism. A positioning component for positioning the ecological board substrate is installed on the support platform; the positioning component further includes: Four sliding columns are provided. Each of the four outer walls of the support platform is provided with a sliding groove that is adapted to slide with the corresponding sliding column. A spring is provided between the end of the sliding column that extends into the sliding groove and the inner wall of the sliding groove. A positioning plate is provided at the end of the sliding column facing the outside of the sliding groove. Both ends of the positioning plate are provided with inclined surfaces. When the four positioning plates are closed, they form a square frame structure. A rotating plate has arc-shaped guide platforms that are equidistantly arranged on its outer circumferential wall to accommodate four sliding columns. The bottom end of the support platform is provided with a connecting groove for accommodating the rotating plate. The rotating plate is rotatably installed in the connecting groove. Each of the four sliding grooves is provided with a strip-shaped hole that communicates with the connecting groove. A guide post is fixedly installed in the area inside the sliding groove at the bottom end of the sliding column. The bottom end of the guide post extends into the connecting groove through the strip-shaped hole, and the outer circumferential wall of the guide post slides in contact with the outer arc surface of the corresponding arc-shaped guide platform. The drive assembly, mounted at the bottom of the support platform, provides rotational power to the rotating plate.

[0027] This invention provides a convenient and efficient cold press positioning operation. The drive assembly rotates the rotating plate, and with the cooperation of the arc-shaped guide table and guide columns, the four sliding columns and positioning plates can be moved simultaneously, eliminating the need to control multiple components separately and improving positioning efficiency. High positioning accuracy is achieved; the four positioning plates close to form a square frame, allowing for simultaneous positioning from all four sides of the eco-board substrate. Combined with the elastic force of the springs, this ensures the substrate is firmly and centrally positioned, preventing substrate displacement during cold pressing and guaranteeing the structural strength and surface flatness of the formed eco-board, which is beneficial for subsequent hot pressing. Furthermore, the pressing mechanism and positioning assembly work together to stably complete the eco-board cold pressing process, ensuring reliable operation and reducing the failure rate during production. It also facilitates the handling of waste adhesive flowing out during extrusion, improving convenience.

[0028] Furthermore, it also includes a base, a frame mounted on the base, a box at the top of the base, an inner cavity with an opening facing the direction, four columns between the bottom of the support platform and the bottom wall of the inner cavity, and a top-to-bottom through guide groove at the centripetal end of each of the four positioning plates.

[0029] Furthermore, the drive assembly also includes a first telescopic cylinder, which is fixedly installed at the bottom of the support platform. The output end of the first telescopic cylinder is provided with a first telescopic shaft, and the output end of the first telescopic shaft is provided with a rack. A gear that meshes with the rack is coaxially fixed at the bottom end of the rotating plate.

[0030] Furthermore, the pressing mechanism also includes a second telescopic cylinder, and a second telescopic shaft is provided at the bottom output end of the second telescopic cylinder. The bottom of the second telescopic shaft slides through the frame and is fixedly connected to the top of the pressure plate.

[0031] Furthermore, a four-claw stabilizer is fixedly installed between the second telescopic shaft and the pressure plate.

[0032] Furthermore, a support plate is fixedly installed at the bottom end of the support platform near the side. A limit rod is horizontally slidably installed through the support plate. One end of the limit rod is fixedly connected to the rack, and the other end of the limit rod is fixedly installed with a limit plate.

[0033] Furthermore, a cleaning port communicating with the inner cavity is opened on the side wall of the box, and a baffle is detachably installed at the cleaning port.

[0034] Preferably, step f, hot pressing, includes hot pressing the cold-pressed slab, with a unit pressure of 0.7-0.9 MPa and a time of 40-50 min.

[0035] More preferably, step f, hot pressing, includes hot pressing the cold-pressed slab, with a unit pressure of 0.8 MPa and a time of 45 min.

[0036] In summary, the present invention has the following beneficial effects: 1. Integrative Innovation of Function and Adhesive System: Breaking through the traditional segmented process of "adhesive preparation-mixing-coating," tebuconazole is introduced simultaneously during the water dispersion and chain extension modification stage of the waterborne polyurethane prepolymer, achieving one-step completion of adhesive synthesis and anti-corrosion functional loading. Theoretically, this solves the problems of uneven dispersion of anti-corrosion components and weak bonding with the adhesive layer in traditional anti-corrosion boards, achieving a synergistic improvement in adhesive strength and anti-corrosion performance. Simultaneously, the polyurethane adhesive layer can act as a slow-release carrier for tebuconazole, extending the anti-corrosion effect.

[0037] 2. Innovative process combining segmented temperature control and segmented molding: The process employs a stepped temperature control reaction of "90℃ prepolymerization → 60℃ neutralization → 30℃ dispersion and chain extension" to precisely regulate the molecular structure and properties of the polyurethane prepolymer and avoid side reactions. Combined with a segmented molding process of "cold pressing + hot pressing", cold pressing ensures that the adhesive fully penetrates the veneer interface, while hot pressing promotes resin curing and uniform distribution of anti-corrosion components, effectively improving the mechanical properties, dimensional stability and water resistance of the board, and breaking through the limitations of performance imbalance in traditional molding processes.

[0038] 3. Green Ecology and High Performance Adaptation Innovation: Adopting an anionic waterborne polyurethane system with water as the dispersion medium and no organic solvents added, VOCs release is reduced from the source, meeting the environmental protection requirements of indoor ecological boards; Dimethylolpropionic acid imparts self-emulsifying ability to polyurethane, taking into account both system stability and coating properties, achieving a theoretical balance between high performance and green environmental protection while realizing the long-term anti-corrosion function of indoor boards, which is in line with the development trend of functionalization and greening of indoor building materials. Attached Figure Description

[0039] Figure 1 This is an isometric perspective view of the overall structure of the present invention; Figure 2 This is a partial top view of the structure of the support base and positioning plate of the present invention; Figure 3 This is a bottom view of the structure of the rotating plate, arc-shaped guide platform, guide column and positioning plate of the present invention with the four positioning plates in the open state; Figure 4 This is a perspective view of the structure of the support platform, rotating plate and drive assembly of the present invention, viewed from the top left front corner. Figure 5 This is a partial three-dimensional view of the support base of the present invention when the four positioning plates are closed to form a square frame structure, as viewed from the top side. Figure 6 This is a perspective view of a portion of the connection structure between the pressure plate and the four-claw stabilizer of the present invention; Figure 7 This is a three-dimensional view showing the disassembled casing, four columns, and support platform of the present invention. The following are labels in the attached diagram: 1. Support platform; 2. Frame; 3. Pressure plate; 4. Sliding column; 5. Spring; 6. Positioning plate; 7. Rotating plate; 8. Arc-shaped guide platform; 9. Guide column; 10. Base; 11. Box body; 12. Column; 13. Flow channel; 14. First telescopic cylinder; 15. First telescopic shaft; 16. Rack; 17. Gear; 18. Second telescopic cylinder; 19. Second telescopic shaft; 20. Four-claw stabilizer; 21. Support plate; 22. Limiting rod; 23. Limiting plate; 24. Baffle. Detailed Implementation

[0040] Example 1

[0041] A method for preparing an indoor anti-corrosion ecological board includes the following steps: (1) Add toluene diisocyanate, polyether polyol and dimethylolpropionic acid to the reaction vessel, heat to 90°C in a water bath and stir for 70 min; the mass ratio of polyether polyol: toluene diisocyanate: dimethylolpropionic acid is 100:40:8; (2) Lower the water bath temperature to 60°C, add triethylamine, stir for 90 min to generate a prepolymer, with 6.79 parts of triethylamine; (3) Lower the water bath temperature to 30°C, and add deionized water and tebuconazole during the stirring process. After the prepolymer is completely dispersed in the water, add ethylenediamine and stir for 60 minutes. The amount of ethylenediamine is 2.10 parts, deionized water is 351 parts, and tebuconazole is 3 parts. (4) Apply the prepared water-based polyurethane to the veneer, with a single-sided coating amount of 175 g / ㎡. After applying the adhesive, assemble the veneer. (5) The assembled slab is cold-pressed. The cold-pressing process has a unit pressure of 0.8 MPa. (6) Hot press the cold-pressed slab. The hot pressing process has a unit pressure of 0.8 MPa and a time of 45 min.

[0042] like Figures 1 to 7 As shown, a specific ecological board cold pressing forming device is used during cold pressing. The frame 2 is located above the support platform 1. A pressing mechanism is installed on the frame 2. The pressing mechanism includes a second telescopic cylinder 18. The bottom output end of the second telescopic cylinder 18 is provided with a second telescopic shaft 19. The bottom of the second telescopic shaft 19 slides through the frame 2 and is fixedly connected to the top of the pressure plate 3. A positioning component is provided on the support platform 1. The positioning component includes four sliding columns 4, a rotating plate 7 and a driving component. Each of the four outer walls of the support platform 1 is provided with a sliding groove that is slidably adapted to the corresponding sliding column 4. A spring 5 is provided between the end of the sliding column 4 that extends into the sliding groove and the inner wall of the sliding groove. A positioning plate 6 is provided at the end of the sliding column 4 facing the outside of the sliding groove. Both ends of the positioning plate 6 are provided with inclined surfaces. When the four positioning plates 6 are closed, they form a square frame structure. The rotating plate 7 has arc-shaped guide platforms 8 equidistantly arranged on its outer circumferential wall to fit the four sliding columns 4. The bottom end of the support platform 1 has a connecting groove for accommodating the rotating plate 7. The rotating plate 7 is rotatably installed in the connecting groove. Each of the four sliding grooves has a strip-shaped hole communicating with the connecting groove. The bottom end of the sliding column 4 is fixedly provided with a guide post 9 in the area inside the sliding groove. The bottom end of the guide post 9 extends into the connecting groove through the strip-shaped hole, and the outer circumferential wall of the guide post 9 slides in contact with the outer arc surface of the corresponding arc-shaped guide platform 8. The driving assembly includes a first telescopic cylinder 14, which is fixedly installed at the bottom of the support platform 1. The output end of the first telescopic cylinder 14 is provided with a first telescopic shaft 15, and the output end of the first telescopic shaft 15 is provided with a rack 16. The bottom end of the rotating plate 7 is coaxially fixed with a gear 17 that meshes with the rack 16.

[0043] In this embodiment, the glued ecological board substrate is first placed in the center area of ​​the support platform 1. Then, the first telescopic cylinder 14 in the drive assembly is activated. The first telescopic cylinder 14 drives the first telescopic shaft 15 to extend and retract, thereby pushing the rack 16 to move horizontally. Since the rack 16 meshes with the gear 17 at the bottom of the rotating plate 7, when the rack 16 moves, it drives the gear 17 and the coaxially fixed rotating plate 7 to rotate in the connecting groove, realizing stable power transmission. The gear 17 and rack 16 transmission structure is precisely matched, which can ensure that the rotation angle of the rotating plate 7 is controllable, thus providing a guarantee for positioning accuracy. When the four positioning plates 6 are in the open state, the guide post 9 remains fixed in position under the thrust of the arc-shaped guide platform 8. At this time, the sliding column 4 applies a tensile force to the spring 5. When the rotating plate 7 rotates, its circumferential arc-shaped guide platform 8 rotates synchronously. The outer arc surface of the arc-shaped guide platform 8 slides in contact with the circumferential outer wall of the guide post 9. As the arc-shaped guide platform 8 rotates, the horizontal centrifugal thrust on the guide post 9 decreases. Under the force of the spring 5 restoring its elastic deformation, the guide post 9 moves centripetally. The guide post 9 slides along the strip hole, thereby driving the sliding column 4, which is fixedly connected to the guide post 9, to move along the slide groove towards the center of the support platform 1. The four sliding columns 4 move towards the center synchronously, causing the positioning plates 6 at their respective ends to move synchronously closer to the ecological board substrate. The inclined surfaces at the ends of the positioning plates 6 can achieve precise alignment. At the same time, the synchronous movement of the four positioning plates 6 can achieve precise positioning from the four sides of the substrate, ensuring that the substrate is in the center position of the support platform 1, solving the problems of cumbersome positioning and low accuracy of existing devices. When the four positioning plates 6 close to form a square frame, the positioning plates 6 are tightly fitted to the substrate. The elastic force of the spring 5 can generate a continuous tension force on the positioning plates 6, ensuring that the substrate is firmly positioned and preventing displacement during subsequent cold pressing. After positioning, the second telescopic cylinder 18 in the pressing mechanism is activated. The second telescopic cylinder 18 drives the second telescopic shaft 19 to extend downward, thereby pushing the pressure plate 3 to move downward synchronously. The pressure plate 3 gradually approaches and presses the ecological board substrate on the support platform 1, applying stable pressure to the substrate at room temperature, so that the substrate layer after gluing is tightly bonded, realizing cold pressing molding. The second telescopic cylinder 18 drives stably and can accurately control the downward pressure and stroke of the pressure plate 3, ensuring the cold pressing molding effect. After cold pressing is completed, the first telescopic cylinder 14 is controlled to extend and retract in the opposite direction, driving the rack 16 to move in the opposite direction, which in turn drives the gear 17 and the rotating plate 7 to rotate in the opposite direction. The arc-shaped guide table 8 applies centrifugal thrust to the guide column 9. At this time, the spring 5 is stretched, pushing the sliding column 4 to move outward along the sliding groove, driving the positioning plate 6 away from the substrate, releasing the positioning of the substrate. Then, the second telescopic cylinder 18 is controlled to drive the pressure plate 3 to rise, and the formed ecological board can be taken out. The whole operation process is smooth, with high positioning and cold pressing efficiency, effectively improving production efficiency and product quality.

[0044] Example 2

[0045] A method for preparing an indoor anti-corrosion ecological board includes the following steps: (1) Add toluene diisocyanate, polyether polyol and dimethylolpropionic acid to the reaction vessel, heat to 90°C in a water bath and stir for 70 min; the mass ratio of polyether polyol: toluene diisocyanate: dimethylolpropionic acid is 100:50:9; (2) Lower the water bath temperature to 60°C, add triethylamine, stir for 90 min to generate a prepolymer, with 6.79 parts of triethylamine; (3) Lower the water bath temperature to 30°C, and add deionized water and tebuconazole during the stirring process. After the prepolymer is completely dispersed in the water, add ethylenediamine and stir for 60 minutes. (4) Apply the prepared water-based polyurethane to the veneer, with a single-sided coating amount of 175 g / ㎡. After applying the adhesive, assemble the veneer. (5) The assembled slab is cold-pressed. The cold-pressing process is carried out at a unit pressure of 0.8 MPa for 2 hours. (6) Hot press the cold-pressed slab. The hot pressing process has a unit pressure of 0.8 MPa and a time of 45 min.

[0046] Based on the first embodiment, the cold pressing device used in step (5) also includes a base 10, a frame 2 is installed on the base 10, a box 11 is provided at the top of the base 10, the box 11 has an inner cavity with an opening facing the direction, four columns 12 are provided between the bottom end of the support platform 1 and the inner bottom wall of the box 11; the centripetal end of each of the four positioning plates 6 is provided with a top-bottom through guide groove 13; a four-claw stabilizer 20 is fixed between the second telescopic shaft 19 and the pressure plate 3; a support plate 21 is fixedly provided at the bottom end of the support platform 1 near the side, a limiting rod 22 is horizontally slidably provided on the support plate 21, one end of the limiting rod 22 is fixedly connected to the rack 16, and the other end of the limiting rod 22 is fixedly provided with a limiting plate 23; a cleaning port communicating with the inner cavity is opened on the side wall of the box 11, and a baffle 24 is detachably provided at the cleaning port.

[0047] In this embodiment, during specific implementation, the connection status of each component of the device is checked to ensure that the baffle 24 is tightly installed at the cleaning port of the box 11. When the ecological board substrate is placed in the center of the support platform 1, the drive assembly is activated. The first telescopic cylinder 14 pushes the rack 16 to move. At this time, the limiting rod 22, which is fixedly connected to the rack 16, slides horizontally along the support plate 21. The limiting plate 23 can limit the movement stroke of the rack 16, preventing excessive movement of the rack 16 from damaging the gear 17, rotating plate 7, and sliding column 4, ensuring the safety and stability of the device operation and extending the service life of the components. The rack 16 drives the gear 17 and rotating plate 7 to rotate, pushing the sliding column 4 and positioning plate 6 to move towards the center, completing the positioning of the substrate. After positioning, the pressing mechanism is activated. The second telescopic cylinder 18 pushes the pressure plate 3 down through the second telescopic shaft 19. The four-claw stabilizing frame 20 between the second telescopic shaft 19 and the pressure plate 3 can make the pressure plate 3 evenly stressed, preventing the pressure plate 3 from tilting during the pressing process, ensuring that the pressure on each part of the substrate is consistent, and further improving the surface flatness and structural strength of the formed ecological board. During the cold pressing process, the adhesive applied between the substrates of the eco-board will flow out from the four edges of the substrates as they are squeezed. This adhesive can fall through the guide channel 13 at the center end of the positioning plate 6 to the support platform 1, and then into the inner cavity of the box 11, effectively collecting the flowing adhesive. The support platform 1 is installed on the inner bottom wall of the box 11 by four columns 12, which provide stable support and reduce shaking during cold pressing, ensuring the stability of the cold pressing process. After cold pressing is completed, the positioning is released and the eco-board is removed. The baffle 24 at the cleaning port can be periodically removed to clean the accumulated adhesive in the inner cavity of the box 11, making the operation convenient. Throughout the entire operation, the various subordinate technical features work together to further improve the practicality, safety, and stability of the device, adapting to the needs of batch and high-efficiency eco-board production.

[0048] The working principle of this invention is as follows: Through the coordinated operation of the positioning component and the pressing mechanism, precise positioning and cold pressing of the ecological board substrate are achieved. First, the drive component provides power to rotate the rotating plate 7. Utilizing the sliding engagement between the arc-shaped guide platform 8 on the rotating plate 7 and the guide post 9 at the bottom of the sliding column 4, the four sliding columns 4 move synchronously along the sliding groove, thereby simultaneously positioning the positioning plate 6 from all four sides of the substrate. The elastic force of the spring 5 ensures secure positioning. After positioning, the telescopic cylinder in the pressing mechanism drives the pressure plate 3 downward, applying stable pressure to the substrate to achieve cold pressing at room temperature. After the operation is completed, the drive component reverses its movement, releasing the positioning and allowing the formed ecological board to be removed. The entire process is convenient, precise, and stable, effectively addressing the shortcomings of existing devices and improving the production efficiency and product quality of ecological boards.

[0049] Example 3

[0050] A method for preparing an indoor anti-corrosion ecological board includes the following steps: (1) Add toluene diisocyanate, polyether polyol and dimethylolpropionic acid to the reaction vessel, heat to 90°C in a water bath and stir for 70 min; the mass ratio of polyether polyol: toluene diisocyanate: dimethylolpropionic acid is 100:60:10; (2) Lower the water bath temperature to 60°C, add triethylamine, stir for 90 min to generate a prepolymer, with 6.79 parts of triethylamine; (3) Lower the water bath temperature to 30°C, and add deionized water and tebuconazole during the stirring process. After the prepolymer is completely dispersed in the water, add ethylenediamine and stir for 60 minutes. The amount of ethylenediamine is 2.10 parts, deionized water is 351 parts, and tebuconazole is 5 parts. (4) Apply the prepared water-based polyurethane to the veneer, with a single-sided coating amount of 175 g / ㎡. After applying the adhesive, assemble the veneer. (5) The assembled slab is cold-pressed. The cold-pressing process is carried out at a unit pressure of 0.8 MPa for 2 hours. (6) Hot press the cold-pressed slab. The hot pressing process has a unit pressure of 0.8 MPa and a time of 45 min.

[0051] Comparative Example 1 (without tebuconazole, otherwise the same as Example 1)

[0052] A method for preparing an indoor ecological board includes the following steps: (1) adding toluene diisocyanate, polyether polyol, and dimethylolpropionic acid to a reaction vessel, heating in a water bath to 90°C, and stirring for 70 min; the mass ratio of polyether polyol: toluene diisocyanate: dimethylolpropionic acid is 100:40:8; (2) lowering the water bath temperature to 60°C, adding triethylamine, and stirring for 90 min to generate a prepolymer, wherein the amount of triethylamine is 6.79 parts; (3) lowering the water bath temperature to 30°C, adding deionized water during stirring, without adding tebuconazole; after the prepolymer is completely dispersed in water, adding ethylenediamine, and stirring for 60 min; the amount of ethylenediamine is 2.10 parts, and the amount of deionized water is 351 parts. (4) Apply the prepared water-based polyurethane to the single board, with a single-sided coating amount of 175g / ㎡. After applying the adhesive, assemble the single board. (5) Cold press the assembled board with a unit pressure of 0.8MPa. (6) Hot press the cold-pressed board with a unit pressure of 0.8MPa for 45min.

[0053] Comparative Example 2 (using ordinary urea-formaldehyde resin adhesive, without using the water-based polyurethane of this invention)

[0054] A method for preparing an indoor ecological board includes the following steps: (1) using ordinary urea-formaldehyde resin adhesive without adding tebuconazole; (2) coating the urea-formaldehyde resin adhesive on the board with a single-sided coating amount of 175 g / m², and assembling the board; (3) cold pressing: unit pressure 0.8 MPa; (4) hot pressing: unit pressure 0.8 MPa, time 45 min.

[0055] Experimental detection methods 1. Adhesion strength test

[0056] Reference standard: GB / T 17657-2013 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels" Sample size: 25mm × 100mm Test method: Dry bond strength + bond strength after impregnation and peel (requirements for Class I boards) Judgment: Plywood meeting the requirements of Class I is considered qualified.

[0057] 2. Anti-corrosion, anti-mildew, and decay resistance tests

[0058] Reference standard: GB / T 27651-2011 "Classification of Durability of Timber and Wood-based Materials" The indoor high-humidity simulated environment was used: temperature (23±2)℃, relative humidity 85%±5%, for 90 days. Observe the mold level and decay of the sample; Durability rating: C3.1 indicates that it can be used in indoor and outdoor environments with high humidity and occasional rain.

[0059] 3. Mildew resistance rating

[0060] Grade 0: No mold; Grade 1: Mold area ≤ 10%; Grade 2: 10% < mold area ≤ 30%; Grade 3: Mold area > 30%.

[0061] Table 1. Performance Comparison of Examples and Comparative Examples

[0062] Embodiments and comparative examples of the present invention: (1) The present invention uses water-based polyurethane adhesive, which has high bonding strength and no delamination or peeling after impregnation, meeting the requirements for use of Class I plywood and can be used in high humidity environments.

[0063] (2) In this invention, tebuconazole is added to the waterborne polyurethane system as an anti-corrosion and anti-mildew component, and the resulting ecological board has a durability grade of C3.1, with no obvious mold or decay in high humidity environment.

[0064] (3) Comparative Example 1 did not add tebuconazole. Although the bonding strength was acceptable, the anti-corrosion and anti-mildew properties were poor. Comparative Example 2 used ordinary urea-formaldehyde resin, which had low bonding strength, was easy to delaminate, and was prone to mildew, and could not meet the requirements for use in high humidity environments.

[0065] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for preparing an indoor anti-corrosion ecological board, characterized in that... Includes the following steps: Step a, Prepolymer backbone preparation: Add toluene diisocyanate, polyether polyol, and dimethylolpropionic acid, heat in a water bath, and stir; Step b, prepolymer preparation: Lower the water bath temperature, add triethylamine, stir, and generate the prepolymer; Step c, water dispersion and modification: further reduce the water bath temperature, and add deionized water and tebuconazole during stirring. After the prepolymer is completely dispersed in water, add ethylenediamine and stir for a period of time. Step d, veneer coating and assembly: The prepared water-based polyurethane is coated on the veneer, and the veneers are then assembled after the coating is applied. Step e, cold pressing: The assembled slab is cold pressed; Step f, hot pressing: The cold-pressed slab is hot-pressed.

2. The method for preparing an indoor anti-corrosion ecological board according to claim 1, characterized in that: Step a involves the preparation of the prepolymer framework, specifically including: adding toluene diisocyanate, polyether polyol, and dimethylolpropionic acid to a reaction vessel, heating in a water bath to 80-100℃, and stirring for 50-90 minutes.

3. The method for preparing an indoor anti-corrosion ecological board according to claim 2, characterized in that: Step b, the preparation of the prepolymer, specifically includes: lowering the water bath temperature to 50-70℃, adding triethylamine, stirring for 80-100 minutes to generate the prepolymer.

4. The method for preparing an indoor anti-corrosion ecological board according to claim 3, characterized in that: Step c, water dispersion and modification, specifically includes: further reducing the water bath temperature to 25-35℃, while adding deionized water and tebuconazole during stirring. After the prepolymer is completely dispersed in water, ethylenediamine is added, and the stirring time is 50-70 minutes.

5. The method for preparing an indoor anti-corrosion ecological board according to claim 4, characterized in that: The mass ratio of the polyether polyol to toluene diisocyanate is 1:(0.4-0.6), and the mass ratio of the polyether polyol to dimethylolpropionic acid is 100:(8-10).

6. The method for preparing an indoor anti-corrosion ecological board according to claim 5, characterized in that: The composition of the sample is 6.79 parts triethylamine, 2.10 parts ethylenediamine, 351 parts deionized water, and 3-5 parts tebuconazole.

7. The method for preparing an indoor anti-corrosion ecological board according to claim 6, characterized in that: Step a: Preparation of the prepolymer framework. Toluene diisocyanate, polyether polyol, and dimethylolpropionic acid are added to the reaction vessel, heated to 90°C in a water bath, and stirred for 70 min. Step b: Prepolymer preparation. Lower the water bath temperature to 60°C, add triethylamine, and stir for 90 min to generate the prepolymer. Step c: Water dispersion and modification. Lower the water bath temperature to 30°C. At the same time, add deionized water and tebuconazole during stirring. After the prepolymer is completely dispersed in water, add ethylenediamine and stir for 60 minutes.

8. The method for preparing an indoor anti-corrosion ecological board according to claim 7, characterized in that: Step d, veneer coating and assembly, includes coating the prepared water-based polyurethane onto the veneer with a single-sided coating amount of 160-185 g / m², and then assembling the veneer after coating.

9. The method for preparing an indoor anti-corrosion ecological board according to claim 8, characterized in that: Step e, cold pressing, involves cold pressing the assembled slab. The cold pressing process has a unit pressure of 0.7-0.9 MPa and a time of 1.5-2.5 h.

10. The method for preparing an indoor anti-corrosion ecological board according to claim 9, characterized in that: Step f, hot pressing, involves hot pressing the cold-pressed slab. The hot pressing process has a unit pressure of 0.7-0.9 MPa and a time of 40-50 minutes.

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