Stone composite wallboard and preparation method thereof

Abstract

The invention relates to the technical field of building material manufacturing, in particular to a stone composite wallboard and a preparation method thereof. The stone composite wallboard sequentially comprises a stone decoration layer, an external bonding layer, an elastic buffer layer, an internal bonding layer and a supporting base layer from outside to inside. The stone decoration layer adopts a natural stone sheet; the elastic buffer layer is made of closed-cell foaming high polymer materials, external point impact is converted into dispersed surface loads by means of the elastic deformation capacity of the elastic buffer layer, and the situation that the stone decoration layer is damaged due to local stress concentration is fundamentally avoided. The supporting base layer provides stable support and good flatness for the whole structure. The external bonding layer and the internal bonding layer are selected in a differentiated mode, tight bonding and function cooperation of corresponding layers are achieved through the epoxy resin adhesive and the polyurethane structural adhesive, uniform transfer of loads between layers is guaranteed through a full-plane bonding mode, the overall structural stability is enhanced, and the stone composite wallboard finished product has the excellent decoration performance and impact resistance.

Description

Technical Field

[0001] This invention relates to the field of building materials manufacturing technology, and in particular to a stone composite wall panel and its preparation method. Background Technology

[0002] Natural stone, with its unique texture and high-end decorative effect, has become the preferred material for interior wall decoration. To balance cost control and lightweight requirements, ultra-thin natural stone sheets (stone composite slabs) with a thickness of 0.6 to 1.5 mm are being used more and more widely, especially for wall decoration in high-end residences and commercial spaces.

[0003] However, the inherent brittleness of ultra-thin natural stone results in extremely poor impact resistance, which severely limits its application range: in daily use, common scenarios such as collisions between tables and chairs, and minor bumps from heavy objects can easily cause the stone surface to crack and chip, affecting the decorative effect; even if existing technologies strengthen the strength by increasing the thickness of the stone or bonding a rigid back mesh to the back, they can only improve the resistance to damage during transportation, and cannot fundamentally solve the problem of breakage caused by point impacts. At the same time, it will also increase the weight of the slabs and production costs, which goes against the original intention of using ultra-thin stone.

[0004] Therefore, it is urgent for technical personnel to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a stone composite wall panel that addresses the problems of poor impact resistance, easy cracking and chipping due to daily bumps and knocks, and high maintenance costs associated with existing designs of ultra-thin natural stone.

[0006] This invention relates to a stone composite wall panel, comprising, from the outside to the inside, a stone decorative layer, an outer adhesive layer, an elastic buffer layer, an inner adhesive layer, and a supporting base layer; wherein, the stone decorative layer is a thin sheet of natural stone with a thickness of 0.6–1.5 mm; the elastic buffer layer is a thin sheet of natural stone with a thickness of 2–5 mm, a closed-cell rate ≥90%, and a density of 30–150 kg / m³. 3 The material is a closed-cell foamed polymer; the supporting base layer is a high-density bamboo and wood fiberboard, high-density fiberboard, or glass fiber reinforced polymer board with a thickness of 8-15mm; the external adhesive layer is used for the full-plane bonding of the stone decorative layer and the elastic buffer layer, which is formed by curing epoxy resin adhesive and has a tensile shear strength ≥2.5MPa and an elongation at break ≥5%; the internal adhesive layer is used for the full-plane bonding of the elastic buffer layer and the supporting base layer, which is formed by curing polyurethane structural adhesive and has an initial bonding strength ≥1.0MPa and an elastic modulus of 50-500MPa after curing.

[0007] As a further improvement to the technical solution disclosed in this invention, the stone decorative layer is selected from marble, granite or jade slabs, and its back side is reinforced by a composite treatment of penetrating adhesive and fiberglass mesh.

[0008] As a further improvement to the technical solution disclosed in this invention, the closed-cell rate of the elastic buffer layer is ≥95%, and the density is 60~100kg / m³. 3 The thickness is 3-4 mm, and its 5% compressive permanent deformation is ≤8%, and its impact energy absorption is ≥5 J / cm. 2 The elastic deformation retention rate is ≥90% in an environment of -10℃ to 60℃; the closed-cell foamed polymer material is cross-linked polyethylene, cross-linked polypropylene or high-performance synthetic rubber sheet.

[0009] As a further improvement to the technical solution disclosed in this invention, the density of the supporting base layer is ≥800kg / m³. 3 Furthermore, its surface roughness Ra≤3.2μm.

[0010] As a further improvement to the technical solution disclosed in this invention, the coating amount of the external adhesive layer is 400-600 g / m². 2 The coating amount of the built-in adhesive layer is 250-350 g / m². 2 The curing shrinkage rate of both the external and internal adhesive layers is ≤0.5%, and the bonding strength after curing for 24 hours at 25℃ and 50% humidity is ≥3.0MPa and ≥2.0MPa, respectively.

[0011] In addition, the present invention also discloses a preparation method for preparing the above-mentioned stone composite wall panel, comprising the following steps: S1. Clean the back of the stone decorative layer; treat the bonding surface of the supporting base layer; cut the elastic buffer layer according to the size of the supporting base layer, and clean the surface of the cut elastic buffer layer. S2. Apply polyurethane structural adhesive evenly to the bonding surface of the support base layer after step S1. Then, lay the elastic buffer layer after step S1 flat on the surface of the polyurethane structural adhesive. Use a roller press to roll out the air between the adhesive layer and the elastic buffer layer along the entire plane. Let it stand to cure, so that the support base layer and the elastic buffer layer form a stable bond through the polyurethane structural adhesive. S3. Apply epoxy resin adhesive evenly to the surface of the elastic buffer layer after curing in step S2. Align and attach the stone decorative layer after treatment in step S1 to the surface of the epoxy resin adhesive. Immediately send the assembly consisting of the stone decorative layer, epoxy resin adhesive, elastic buffer layer and supporting base layer into the vacuum negative pressure composite equipment. Maintain the assembly for a preset time under preset vacuum and planar pressure conditions to allow the epoxy resin adhesive to be initially cured and form a composite slab. S4. Place the composite board blank in a preset temperature and humidity environment for curing until the polyurethane structural adhesive and epoxy resin adhesive are completely cured. Then, process the cured composite board blank to the preset finished size using a cutting device.

[0012] As a further improvement to the technical solution disclosed in this invention, in step S2, the coating amount of the polyurethane structural adhesive is 280-320 g / m². 2 The rolling pressure of the roller pressing equipment is 0.3-0.5 MPa, and the rolling speed is 0.8-1.2 m / min; the ambient temperature for static curing is 23-27℃, the humidity is 45-55%, the curing time is 22-26 hours, and a constant compressive stress of 0.1-0.2 MPa is applied to the surface of the elastic buffer layer during the curing process.

[0013] As a further improvement to the technical solution disclosed in this invention, in step S3, the coating amount of the epoxy resin adhesive is 450-550 g / m². 2 The preset vacuum degree is -0.075 to -0.085 MPa, the preset plane pressure is 0.18 to 0.22 MPa, and the preset duration is 28 to 32 minutes.

[0014] As a further improvement to the technical solution disclosed in this invention, before feeding the stone decorative layer into the vacuum negative pressure composite equipment, a pre-pressure of 0.05 to 0.1 MPa is applied to the surface of the stone decorative layer, and the temperature inside the vacuum negative pressure composite equipment is controlled at 25 to 30°C.

[0015] As a further improvement to the technical solution disclosed in this invention, in step S4, the curing environment temperature is 24-26°C, the humidity is 48-52%, and the curing time is 70-74 hours.

[0016] Regarding the subject matter of the application for stone composite wall panels, their practical application can achieve at least the following beneficial technical effects, specifically: 1) A five-layer composite system with clearly defined functions and synergistic adaptation was constructed, enabling the finished stone composite wall panels to possess both excellent decorative performance and impact resistance. The stone decorative layer uses thin slices of natural stone, fully preserving the unique texture and high-end decorative attributes of natural stone; the elastic buffer layer, as the core functional carrier, transforms external point impacts into dispersed surface loads through its own elastic deformation capability, fundamentally preventing damage to the stone decorative layer due to localized stress concentration; the supporting base layer provides stable support and good flatness for the overall structure, ensuring the structural reliability and long-term durability of the stone composite wall panels after installation. The external and internal adhesive layers adopt differentiated selection designs. The epoxy resin adhesive has excellent tensile shear strength and suitable elongation at break, ensuring tight adhesion and deformation synergy between the stone decorative layer and the elastic buffer layer. The polyurethane structural adhesive has high initial bond strength and suitable elastic modulus, achieving firm fixation between the elastic buffer layer and the supporting base layer. Furthermore, the full-plane bonding method further ensures uniform load transfer between layers, enhancing the overall structural stability. 2) The elastic buffer layer can absorb minor unevenness of the base wall, greatly reducing the stringent requirements of the base layer for installation, significantly improving the installation error tolerance, effectively reducing the risk of cracking caused by hollowing and base deformation, and making the installation process more efficient and convenient; in addition, the elastic buffer layer itself has good sound damping characteristics, which can effectively block the transmission of sound waves and significantly improve the sound insulation performance of stone composite wall panels. 3) Stone composite wall panels have the characteristic of partial replacement. When the surface stone is damaged due to extreme impact, there is no need to disassemble the whole panel. Only the damaged part needs to be removed and replaced by professional means, which greatly reduces the later maintenance cost and construction difficulty.

[0017] Regarding the application for the preparation method of stone composite wall panels, its practical application can achieve at least the following beneficial technical effects, specifically: 1) Step S1 involves targeted pretreatment based on the characteristics of different substrates. Cleaning the back of the stone decorative layer removes impurities to ensure the subsequent bonding strength. Surface treatment of the bonding surface of the supporting base layer improves the compatibility with polyurethane structural adhesive. Cutting and cleaning the elastic buffer layer according to the size of the supporting base layer ensures accurate matching of the dimensions of each layer, laying the foundation for full-plane bonding. Steps S2 and S3 adopt a layered composite strategy. First, a stable bond is achieved between the supporting base layer and the elastic buffer layer. Then, the elastic buffer layer and the stone decorative layer are composited. This avoids positioning deviations or bonding failures caused by multi-layer synchronous composite. The full-plane rolling operation of the roller pressing equipment can completely remove the air between the adhesive layer and the elastic buffer layer. The application of vacuum negative pressure composite equipment can ensure a tight fit between the stone decorative layer and the elastic buffer layer. From the process perspective, this ensures a full-plane bonding effect and achieves uniform load transfer. 2) Throughout the entire preparation process, each step is clearly defined and executed. From substrate pretreatment, adhesive coating, layer bonding to curing, a complete closed-loop process is formed, enabling large-scale production without complex operations. The combination of static curing and preliminary curing under vacuum negative pressure ensures that the bonding performance of polyurethane structural adhesive and epoxy resin adhesive is fully utilized. Furthermore, the production cycle is reasonably controlled, and the final curing step under a preset temperature and humidity environment ensures that both adhesives are fully cured, avoiding interlayer delamination or insufficient structural strength due to incomplete curing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is a structural schematic diagram of the stone composite wall panel disclosed in this invention.

[0020] 1-Stone decorative layer; 2-External adhesive layer; 3-Elastic buffer layer; 4-Internal adhesive layer; 5-Supporting base layer. Detailed Implementation

[0021] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 The diagram shows the structure of the stone composite wall panel disclosed in this invention. It can be seen that, from the outside to the inside, it includes a stone decorative layer 1, an external adhesive layer 2, an elastic buffer layer 3, an internal adhesive layer 4, and a supporting base layer 5, which together construct a composite system with excellent decorative performance, impact resistance, and structural stability, perfectly adapting to the wall decoration needs of various scenarios.

[0022] The supporting base layer 5 serves as the load-bearing core and structural foundation of the entire wall panel, providing stable support for each functional layer. It is made of high-density bamboo fiberboard, high-density fiberboard, or glass fiber reinforced polymer board with a thickness of 8-15mm and a density ≥800kg / m³. 3 The surface roughness Ra ≤ 3.2μm. The high-density material gives the supporting base layer 5 excellent structural strength and dimensional stability, which can effectively resist the external forces during installation and use, and ensure the overall flatness of the wall panel; the low roughness of the surface after precision treatment can increase the contact area with the subsequent built-in adhesive layer 4, and significantly improve the bonding strength.

[0023] For different application scenarios, the material of the supporting base layer 5 can be flexibly selected: high-density bamboo and wood fiberboard has outstanding environmental protection and is suitable for residential indoor spaces; glass fiber reinforced polymer board has strong weather resistance and can be adapted to semi-outdoor or humid environments; high-density fiberboard has high cost performance and is suitable for large-scale commercial space decoration.

[0024] The built-in adhesive layer 4 serves as the connecting link between the supporting base layer 5 and the elastic buffer layer 3, playing a crucial role in the full-plane bonding. It is formed by curing polyurethane structural adhesive with a coating amount of 250–350 g / m². 2 Preferred concentration: 280–320 g / m 2 Furthermore, the performance parameters of the polyurethane structural adhesive are precisely designed to meet the interlayer synergy requirements: initial bond strength ≥1.0MPa, enabling rapid positioning and fixation of the two-layer structure; after curing, the elastic modulus is 50-500MPa, highly compatible with the elastic properties of the elastic buffer layer 3, ensuring overall structural stability and facilitating the full utilization of its own buffering performance; after curing for 24 hours at 25℃ and 50% humidity, the bond strength is ≥2.0MPa, and the curing shrinkage rate is ≤0.5%, maintaining the firmness of the interlayer bond for a long time and preventing interlayer delamination during use.

[0025] The elastic buffer layer 3 is the core functional layer that gives the wall panel excellent impact resistance. It is made of closed-cell foamed polymer material, with a thickness set at 2–5 mm, and the optimal range verified through process testing is 3–4 mm. To ensure buffering performance and durability, its key performance indicators have undergone rigorous screening: closed-cell rate ≥90%, effectively blocking moisture penetration while ensuring stable elastic recovery; density controlled between 30–150 kg / m³. 3 Preferred weight is 60-100 kg / m³. 3 While ensuring sufficient cushioning effect, it avoids increasing the overall weight of the sheet material, meeting the requirements of lightweight applications; 5% compression set ≤ 8%, impact energy absorption ≥ 5J / cm². 2 It can quickly absorb external impact energy and restore its original shape, transforming point impacts into dispersed surface loads, thus preventing damage to the surface stone due to localized stress concentration from the root cause.

[0026] Furthermore, within a wide temperature range of -10℃ to 60℃, the elastic deformation retention rate of the elastic buffer layer 3 is ≥90%, making it adaptable to different regional environmental and climatic conditions. In terms of materials, cross-linked polyethylene, cross-linked polypropylene, or high-performance synthetic rubber sheets, which combine excellent elastic recovery, aging resistance, and chemical stability, can be selected to maintain the buffering performance without degradation over a long period.

[0027] In addition, the elastic buffer layer 3 itself has good sound damping characteristics, which can effectively block the transmission of sound waves and significantly improve the sound insulation performance of the stone composite wall panel; its elastic properties can also absorb the slight unevenness of the base wall, greatly reduce the demanding requirements of the base layer for installation, improve the installation error tolerance, and reduce the risk of cracking caused by hollowing and base layer deformation.

[0028] The external adhesive layer 2 is used to achieve a tight bond between the elastic buffer layer 3 and the stone decorative layer 1 across the entire surface. It is formed by curing epoxy resin adhesive, and the coating amount is strictly controlled between 400 and 600 g / m². 2 The optimal range is 450–550 g / m³. 2 After multiple rounds of performance testing and optimization, the core performance indicators of the epoxy resin adhesive were clarified: tensile shear strength ≥2.5MPa, elongation at break ≥5%, bond strength ≥3.0MPa after curing for 24 hours at 25℃ and 50% humidity, and curing shrinkage ≤0.5%. This ensures that the external adhesive layer 2 can achieve a tight fit between the elastic buffer layer 3 and the stone decorative layer 1, and also possesses good elastic deformation capability, allowing it to expand and contract synchronously with the deformation of the elastic buffer layer 3, effectively avoiding interlayer peeling or cracking caused by differences in deformation.

[0029] As the core decorative carrier of the wall panel, the stone decorative layer 1 directly determines the aesthetic effect of the wall. Natural stone slabs with a thickness of 0.6 to 1.5 mm are selected, and marble, granite or jade can be flexibly selected according to the decoration needs.

[0030] To further enhance the basic strength and crack resistance of the stone decorative layer 1, its back is reinforced with a composite treatment of penetrating adhesive and fiberglass mesh: the penetrating adhesive uses low-viscosity epoxy resin, which is fully penetrated into the micropores of the stone through immersion to form a dense reinforcement network; the fiberglass mesh is selected with a basis weight of 80-120 g / m². 2 The alkali-resistant fiberglass mesh, after being hot-pressed and composited, forms a firm bond with the back of the stone, effectively inhibiting the expansion of microcracks caused by the brittleness of the stone, and can greatly improve the bonding compatibility with the external adhesive layer 2.

[0031] It is particularly important to note that, thanks to the innovative structural design of the stone composite wall panel, it has the characteristic of partial replacement. That is, when the surface stone is damaged by extreme impact, there is no need to disassemble the entire panel. Only the damaged part needs to be removed and replaced by professional means, which greatly reduces the later maintenance cost and construction difficulty.

[0032] The method for preparing the stone composite wall panel disclosed in this invention will now be described in detail, specifically including the following steps: S1, Pretreatment process First, clean the back of the stone decorative layer 1: use high-pressure air to blow away surface dust, and then wipe with anhydrous ethanol to remove oil stains and residual impurities, ensuring that there are no contaminants on the back that will affect the bonding effect; perform surface treatment on the bonding surface of the supporting base layer 5: select sanding or plasma treatment according to the material characteristics to improve compatibility with polyurethane structural adhesive; according to the actual size of the supporting base layer 5, use CNC cutting equipment to precisely cut the elastic buffer layer 3 to ensure that it is completely adapted to the supporting base layer 5. After cutting, use a brush to remove surface debris and blow it clean with compressed air; Step S2: Composite process of supporting base layer and elastic buffer layer The polyurethane structural adhesive is evenly applied to the bonding surface of the support base layer 5 after step S1 using a doctor blade coater, with the coating amount precisely controlled between 280 and 320 g / m². 2Then, the elastic buffer layer 3, cleaned in step S1, is laid flat on the surface of the polyurethane structural adhesive layer, ensuring no misalignment or wrinkles. Immediately, it is rolled along the entire plane using a roller press, with a roller pressure set to 0.3–0.5 MPa and a roller speed of 0.8–1.2 m / min. Rolling completely removes air between the adhesive layer and the elastic buffer layer 3, preventing air bubbles from affecting the bonding strength. The bonded semi-finished product is placed in a curing chamber at an ambient temperature of 23–27°C and humidity of 45–55% and allowed to cure for 22–26 hours. During curing, a constant compressive stress of 0.1–0.2 MPa is applied to the surface of the elastic buffer layer 3 to ensure tight adhesion between layers, ultimately forming a strong and stable bond between the supporting base layer 5 and the elastic buffer layer 3 through the polyurethane structural adhesive. Step S3: Composite process of elastic buffer layer and stone decorative layer The epoxy resin adhesive is evenly coated using a precision coating machine, with the coating amount controlled at 450–550 g / m². 2 Ensure the adhesive layer covers the surface evenly without any gaps; align and adhere the cleaned stone decorative layer 1 to the surface of the epoxy resin adhesive layer according to the preset position, gently press to release air during the bonding process to avoid misalignment; immediately after bonding, apply a pre-pressure of 0.05-0.1 MPa to the surface of the stone decorative layer 1, and then send the assembly into the vacuum negative pressure composite equipment; the temperature inside the equipment is controlled at 25-30℃, the preset vacuum degree is -0.075 to -0.085 MPa, and the preset plane pressure is 0.18-0.22 MPa. Maintain these conditions for 28-32 minutes to allow the epoxy resin adhesive to initially cure, forming a tightly structured composite slab. Step S4, Curing and Cutting Process The composite slab obtained in step S3 is transferred to a curing room and cured for 70-74 hours at an ambient temperature of 24-26℃ and a humidity of 48-52% to allow the polyurethane structural adhesive and epoxy resin adhesive to fully cure, thereby maximizing the bonding performance and avoiding interlayer delamination or insufficient structural strength due to incomplete curing. After curing, the composite slab is processed to the preset finished size using CNC cutting equipment.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stone composite wall panel, characterized in that, From the outside in, it comprises a stone decorative layer, an external adhesive layer, an elastic buffer layer, an internal adhesive layer, and a supporting base layer; wherein, the stone decorative layer is a thin sheet of natural stone with a thickness of 0.6–1.5 mm; the elastic buffer layer is 2–5 mm thick, with a closed-cell rate ≥90% and a density of 30–150 kg / m³. 3 The material is a closed-cell foamed polymer; the supporting base layer is a high-density bamboo fiberboard, high-density fiberboard, or glass fiber reinforced polymer board with a thickness of 8-15mm; the external adhesive layer is used for bonding the stone decorative layer and the elastic buffer layer to the entire plane, and it is formed by curing epoxy resin adhesive, with a tensile shear strength ≥2.5MPa and an elongation at break ≥5%; the internal adhesive layer is used for bonding the elastic buffer layer and the supporting base layer to the entire plane, and it is formed by curing polyurethane structural adhesive, with an initial adhesive strength ≥1.0MPa and an elastic modulus of 50-500MPa after curing.

2. The stone composite wall panel according to claim 1, characterized in that, The stone decorative layer is selected from marble, granite or jade slabs, and its back is reinforced with a composite of penetrating adhesive and fiberglass mesh.

3. The stone composite wall panel according to claim 1, characterized in that, The closed-cell rate of the elastic buffer layer is ≥95%, and the density is 60~100kg / m³. 3 The thickness is 3-4 mm, and its 5% compressive permanent deformation is ≤8%, and its impact energy absorption is ≥5 J / cm. 2 The elastic deformation retention rate is ≥90% in an environment of -10℃ to 60℃; the closed-cell foamed polymer material is cross-linked polyethylene, cross-linked polypropylene or high-performance synthetic rubber sheet.

4. The stone composite wall panel according to claim 1, characterized in that, The density of the supporting base layer is ≥800kg / m³. 3 Furthermore, its surface roughness Ra≤3.2μm.

5. The stone composite wall panel according to claim 1, characterized in that, The coating amount of the external adhesive layer is 400-600 g / m². 2 The coating amount of the built-in adhesive layer is 250-350 g / m². 2 The curing shrinkage rate of both the external adhesive layer and the internal adhesive layer is ≤0.5%, and the bonding strength after curing for 24 hours at 25℃ and 50% humidity is ≥3.0MPa and ≥2.0MPa, respectively.

6. A preparation method for preparing the stone composite wall panel as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Clean the back of the stone decorative layer; perform surface treatment on the bonding surface of the supporting base layer; cut the elastic buffer layer according to the size of the supporting base layer, and clean the surface of the cut elastic buffer layer. S2. Apply polyurethane structural adhesive evenly to the bonding surface of the support base layer after step S1. Then, lay the elastic buffer layer after step S1 flat on the surface of the polyurethane structural adhesive. Roll the elastic buffer layer with a roller press along the entire plane to remove the air between the adhesive layer and the elastic buffer layer. Allow it to stand and cure so that the support base layer and the elastic buffer layer form a stable bond through the polyurethane structural adhesive. S3. Apply epoxy resin adhesive evenly to the surface of the elastic buffer layer after curing in step S2. Align and attach the stone decorative layer after treatment in step S1 to the surface of the epoxy resin adhesive. Immediately send the assembly consisting of the stone decorative layer, the epoxy resin adhesive, the elastic buffer layer and the supporting base layer into a vacuum negative pressure composite equipment. Maintain the assembly for a preset time under preset vacuum and planar pressure conditions to allow the epoxy resin adhesive to be initially cured and form a composite slab. S4. The composite board blank is placed in a preset temperature and humidity environment for curing until the polyurethane structural adhesive and epoxy resin adhesive are completely cured. The cured composite board blank is then processed to the preset finished size using a cutting device.

7. The preparation method according to claim 6, characterized in that, In step S2, the coating amount of the polyurethane structural adhesive is 280–320 g / m². 2 The rolling pressure of the roller pressing equipment is 0.3-0.5 MPa, and the rolling speed is 0.8-1.2 m / min; the ambient temperature for static curing is 23-27℃, the humidity is 45-55%, the curing time is 22-26 hours, and a constant compressive stress of 0.1-0.2 MPa is applied to the surface of the elastic buffer layer during the curing process.

8. The preparation method according to claim 6, characterized in that, In step S3, the coating amount of epoxy resin adhesive is 450–550 g / m². 2 The preset vacuum degree is -0.075 to -0.085 MPa, the preset plane pressure is 0.18 to 0.22 MPa, and the preset duration is 28 to 32 minutes.

9. The preparation method according to claim 8, characterized in that, Before being fed into the vacuum negative pressure composite equipment, a pre-pressure of 0.05 to 0.1 MPa is applied to the surface of the stone decorative layer, and the temperature inside the vacuum negative pressure composite equipment is controlled at 25 to 30°C.

10. The preparation method according to claim 6, characterized in that, In step S4, the ambient temperature is 24–26℃, the humidity is 48–52%, and the curing time is 70–74 hours.

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