Vacuum sealing plate based on sphere array and split type vacuum hot pressing preparation method thereof

Abstract

The invention discloses a vacuum sealing plate based on a sphere array and a split type vacuum hot pressing preparation method thereof, and belongs to the field of materials, the vacuum sealing plate is formed by hot pressing fusion of an upper function plate and a lower function plate in a vacuum environment, and a two-dimensional array formed by countless independent vacuum sphere units is formed in the vacuum sealing plate. Respectively prefabricating an upper functional board and a lower functional board which are provided with hemispherical pit arrays through injection molding; the prefabricated upper function plate is loaded into a vacuum operation chamber and accurately aligned, and vacuumizing is conducted till the vacuum degree is smaller than or equal to 1 Pa; the butt joint faces of the upper function plate and the lower function plate are heated to be in a molten state, pressure is applied to enable the upper function plate and the lower function plate to be folded, and the two corresponding hemispherical pits are sealed into an independent vacuum sphere unit; and maintaining pressure and cooling to obtain a finished product. The prepared multi-cavity vacuum sealing plate has excellent sound insulation and heat insulation performance, extremely high structural reliability, excellent bending performance and convenient secondary processability which other single-cavity vacuum plates do not have, and can be widely applied to the fields of vehicle light weight and building energy saving.

Description

Technical Field

[0001] This invention belongs to the field of materials technology, specifically relating to a vacuum sealing plate based on a spherical array and its split-type vacuum hot pressing preparation method. Background Technology

[0002] Existing vacuum panels, such as vacuum glass and metal composite vacuum panels, generally employ a single continuous vacuum chamber or a honeycomb structure, and mainly face two major technical bottlenecks: (1) Manufacturing bottleneck: To achieve the integrated molding and sealing method of micron-level vacuum cavity, the requirements for molds and processes are extremely stringent, the cost is high, and the yield rate is low.

[0003] (2) Reliability bottleneck: Although the existing honeycomb structure is designed with unit isolation, its one-piece injection molding sealing line is still at the top of the honeycomb wall. This area is still a potential weak point under long-term stress, such as reduced sound insulation and heat insulation performance, and reduced structural reliability.

[0004] Therefore, the industry urgently needs a new solution that can break through the above-mentioned technical bottlenecks in manufacturing principles and achieve higher reliability and easier mass production of vacuum plates. Summary of the Invention

[0005] To address the technical problems of complex manufacturing processes, limited sealing reliability due to molds, and insufficient long-term fatigue resistance in existing technologies, this invention provides a vacuum sealing plate based on a spherical array and its split-type vacuum hot pressing preparation method. Its core objective is to provide a solution with "absolutely independent units", "optimal sealing welds", and "simplified manufacturing path".

[0006] This invention produces a vacuum sealing plate based on a spherical array using a unique split prefabrication-vacuum hot pressing process. This vacuum sealing plate based on a spherical array has excellent sound and heat insulation performance, extremely high structural reliability, excellent bendability and convenient secondary processing, and can be widely used in the fields of lightweight transportation and building energy conservation.

[0007] The technical solution adopted by this invention to solve the technical problem is as follows: The present invention provides a vacuum sealing plate based on a spherical array, which is formed by hot-pressing an upper functional plate and a lower functional plate in a vacuum environment, and forms a two-dimensional array composed of countless independent vacuum spherical units inside.

[0008] In a preferred embodiment, the upper functional plate is prefabricated with a hemispherical pit array, and the lower functional plate is also prefabricated with a hemispherical pit array. The hemispherical pits prefabricated on the upper functional plate and the hemispherical pits prefabricated on the lower functional plate are in a one-to-one correspondence, forming a pair of spherical pits. Each pair of spherical pits is formed into an independent vacuum spherical unit after being hot-pressed and fused.

[0009] In a preferred embodiment, both the upper and lower functional plates are made of the same engineering plastic.

[0010] As a more preferred embodiment, the engineering plastic is selected from polyketone or modified polycarbonate.

[0011] This invention provides a split-type vacuum hot pressing method for fabricating a vacuum sealing plate based on a sphere array, comprising the following steps: (1) Prefabricated in separate sections; The upper and lower functional plates, each with a hemispherical array of recesses, are pre-molded by injection molding. (2) Vacuum hot pressing fusion; The upper and lower functional plates are precisely aligned and installed in a vacuum hot press, and the vacuum is evacuated to a degree ≤1Pa. The mating surfaces of the upper and lower functional plates are heated to a molten state, and pressure is applied to bring the upper and lower functional plates together, sealing the corresponding two hemispherical recesses into an independent vacuum spherical unit. After pressure holding and cooling, the finished product is obtained.

[0012] In a preferred embodiment, the upper and lower functional plates have the same structure, size, and material; the upper functional plate is prefabricated with a hemispherical recess array, and the lower functional plate is also prefabricated with a hemispherical recess array, and the hemispherical recesses prefabricated on the upper functional plate and the hemispherical recesses prefabricated on the lower functional plate are in a one-to-one correspondence, forming a pair of spherical recesses.

[0013] As a preferred embodiment, in step (2), under vacuum conditions, the mating surfaces of the upper and lower functional plates are radiated or contact heated by the upper and lower hot press plates in the working chamber of the vacuum hot press equipment.

[0014] As a preferred embodiment, for polyketone, the heating temperature range is 240-250°C and the heating time range is 10-20 seconds; for modified polycarbonate, the heating temperature range is 230-250°C and the heating time range is 10-20 seconds.

[0015] In a more preferred embodiment, the mating surface of the upper functional plate is radiated or heated by contact using an upper hot press plate; the mating surface of the lower functional plate is radiated or heated by contact using a lower hot press plate.

[0016] As a preferred embodiment, in step (2), when the mating surfaces of the upper and lower functional plates reach the optimal viscous flow state, the upper and lower hot press plates apply precise pressure under program control, so that the upper and lower functional plates close instantly; the optimal viscous flow state refers to the melt viscosity being maintained at 500 Pa·s-1500 Pa·s.

[0017] In a preferred embodiment, the pressure in step (2) is 20MPa-60MPa.

[0018] As a preferred embodiment, in step (2), after holding pressure and cooling for 20s-40s, the molten interface between the upper and lower functional plates completes the mutual diffusion and entanglement of molecular chains in a vacuum environment, forming a homogeneous weld with strength comparable to the substrate.

[0019] The beneficial effects of this invention are: (1) Revolutionary improvement in reliability: This invention achieves the ultimate in product lifespan and resistance to local damage through two process routes: absolutely independent design of spherical units and homogeneous hot-pressed welds. Local damage does not affect the overall function at all.

[0020] (2) The manufacturing process is greatly improved: This invention abandons the expensive integrated vacuum injection mold and adopts a mature conventional injection molding combined with vacuum hot pressing process, which greatly reduces the technical threshold and manufacturing cost, and is more conducive to large-scale production.

[0021] (3) Excellent performance: The vacuum sealing plate based on spherical array prepared by the present invention inherits all the advantages of vacuum heat insulation and sound insulation materials. At the same time, the spherical array structure can undergo flexible deformation through the matrix material between the spheres when bent, thereby obtaining a bendable performance superior to that of rigid honeycomb structure.

[0022] (4) Quality controllable: In this invention, the key process parameters (temperature, pressure, vacuum degree) of hot pressing welding can be precisely controlled, and the production consistency and yield rate are far higher than those of the one-piece molding process that relies on the simultaneous vacuuming of thousands of micropores. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a vacuum sealing plate based on a sphere array, provided by the present invention.

[0024] Figure 2 The flowchart illustrates a split-type vacuum hot pressing method for preparing a vacuum sealing plate based on a spherical array, as provided by this invention.

[0025] In the figure, the upper functional plate 1 has a hemispherical recess 101, and the lower functional plate 2 has a hemispherical recess 201. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] In a first aspect, the present invention provides a vacuum sealing plate based on a sphere array.

[0028] like Figure 1As shown, the present invention provides a vacuum sealing plate based on a spherical array, which is formed by hot-pressing and fusing an upper functional plate 1 and a lower functional plate 2 in a vacuum environment, and forms a two-dimensional array composed of countless independent vacuum spherical units inside.

[0029] In this invention, the upper functional plate 1 and the lower functional plate 2 have the same structure and dimensions. Taking the upper functional plate 1 as an example, a hemispherical recess array is prefabricated on the upper functional plate 1, and similarly, a hemispherical recess array is prefabricated on the lower functional plate 2. Furthermore, the hemispherical recesses 101 prefabricated on the upper functional plate 1 and the hemispherical recesses 201 prefabricated on the lower functional plate 2 are in a one-to-one correspondence, forming a pair of spherical recesses. Each pair of spherical recesses is formed into an independent vacuum spherical unit after being hot-pressed and fused.

[0030] In this invention, each independent vacuum sphere unit is a completely independent vacuum-sealed cavity with a vacuum level ≤1Pa. Furthermore, each independent vacuum sphere unit is completely isolated from the other by the substrates of the upper functional plate 1 and the lower functional plate 2. This means that if any independent vacuum sphere unit is damaged, its vacuum failure will be strictly confined within that independent vacuum sphere unit, truly achieving zero fault propagation and an overall performance retention rate approaching 100%.

[0031] Preferably, the upper functional plate 1 and the lower functional plate 2 are both made of the same material, such as engineering plastics.

[0032] More preferably, engineering plastics can be selected from polyketone (POK) or modified polycarbonate (PC / ABS+GF), etc. Among them, polyketone (POK) has extremely low gas permeability and excellent mechanical strength, which enables the high-reliability fabrication of vacuum sealing plates. Modified polycarbonate (PC / ABS+GF) has high impact resistance and weather resistance, which enables the high-performance fabrication of vacuum sealing plates.

[0033] The present invention provides a vacuum sealing plate based on a spherical array, which has uniform chemical and physical properties. In particular, the vacuum hot-pressing fusion interface is a homogeneous fusion, which avoids the compatibility risks and leakage channels caused by dissimilar materials.

[0034] Secondly, the present invention provides a split-type vacuum hot pressing preparation method for a vacuum sealing plate based on a spherical array.

[0035] See Figure 2As shown, the present invention provides a split-type vacuum hot pressing preparation method for a vacuum sealing plate based on a spherical array. This method combines split prefabrication with vacuum hot pressing, thereby decoupling the complex vacuum and sealing issues. It addresses these issues step-by-step through a phased strategy. The specific implementation process is as follows: Step S1: Prefabrication in separate sections; The upper functional plate 1 and the lower functional plate 2 are pre-molded using a conventional injection molding machine.

[0036] Specifically, the upper functional plate 1 and the lower functional plate 2 have the same structure, size, and material. Taking the upper functional plate 1 as an example, the upper functional plate 1 has a pre-fabricated array of hemispherical recesses, and similarly, the lower functional plate 2 also has a pre-fabricated array of hemispherical recesses. Furthermore, the pre-fabricated hemispherical recesses 101 on the upper functional plate 1 and the pre-fabricated hemispherical recesses 201 on the lower functional plate 2 are in a one-to-one correspondence, forming a pair of spherical recesses.

[0037] In this invention, the upper functional plate 1 and the lower functional plate 2 are simply single-sided cavity molds without complex internal core pulling or vacuum flow channels, which greatly reduces the manufacturing difficulty and cost.

[0038] Step S2: Vacuum hot pressing fusion; S2.1: Clamping and preheating; Precisely align the upper functional plate 1 and the lower functional plate 2, and install them into the working chamber of the vacuum hot press equipment. After the working chamber of the vacuum hot press equipment is closed, begin evacuating the air from the working chamber until the vacuum degree is ≤1Pa, for example, evacuate the vacuum degree to 0.5Pa.

[0039] S2.2: Dual-sided heating; In a vacuum environment, the mating surfaces of the upper and lower functional plates are radiated or contact heated by the upper and lower hot press plates in the working chamber of the vacuum hot press equipment.

[0040] Specifically, for polyketone (POK), the heating temperature range can be 240-250℃, and the heating time range can be 10-20 seconds; for modified polycarbonate (PC / ABS+GF), the heating temperature range can be 230-250℃, and the heating time range can be 10-20 seconds.

[0041] Specifically, the mating surface of the upper functional plate 1 is radiated or heated by contact using the upper hot press plate; the mating surface of the lower functional plate 2 is radiated or heated by contact using the lower hot press plate.

[0042] In this invention, by precisely controlling the heating temperature and heating time of the mating surfaces of the upper and lower functional plates, the mating surfaces of the upper and lower functional plates can be made into a molten state, while most of the substrate of the upper and lower functional plates remains in a solid state.

[0043] S2.3: Pressurized closing; When the mating surfaces of the upper and lower functional plates reach the optimal viscous flow state, the upper and lower hot press plates apply precise pressure under program control, causing the upper and lower functional plates to close instantly.

[0044] Specifically, the optimal viscous flow parameters are as follows: The optimal viscous flow state is considered to be when the melt viscosity is maintained between 500 Pa·s and 1500 Pa·s.

[0045] Specifically, the upper and lower hot press plates apply pressure precisely under program control, with the following pressure parameters: Pressure 20MPa-60MPa, for example, the preferred pressure is 40MPa.

[0046] S2.4: Intermolecular fusion; Under pressure and vacuum conditions, each spherical indentation completely seals the molten substrate, forming an independent vacuum spherical unit. Because the entire manufacturing process takes place in an ultra-high vacuum environment, a vacuum state naturally forms inside the independent vacuum spherical unit and remains there continuously.

[0047] S2.5: Pressure holding and cooling; After holding the pressure and cooling for 20-40 seconds, the molten interface between the upper and lower functional plates completes the mutual diffusion and entanglement of molecular chains in a vacuum environment, forming a homogeneous weld with strength comparable to the substrate; after shaping, the finished product is obtained.

[0048] Step S3: Post-processing and detection; After demolding, the edges of the vacuum sealing plate are trimmed. Simultaneously, a helium mass spectrometer leak detector is used to sample and test the vacuum sealing plate, and the overall performance of the vacuum sealing plate is verified through measurements of heat transfer coefficient and sound insulation.

[0049] The present invention provides a split vacuum hot pressing preparation method for a vacuum sealing plate based on a spherical array, which ensures that the chemical and physical properties of the entire vacuum sealing plate are uniform. In particular, the vacuum hot pressing fusion interface is a homogeneous fusion, without any compatibility risks or leakage channels caused by dissimilar materials.

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0051] Example 1: Split-type vacuum hot pressing method for fabricating vacuum sealing plates based on spherical arrays Both the upper and lower functional plates are made of polyketone (POK), and their thickness is 4mm. The upper and lower functional plates, each with a hemispherical recess array, are pre-molded separately. The upper and lower functional plates are precisely aligned and installed in a vacuum hot press, with a vacuum level of 0.5Pa. The mating surfaces of the upper and lower functional plates are heated to a molten state at 245℃ for 15 seconds. Pressure (40MPa) is applied to bring the upper and lower functional plates together, sealing the corresponding two hemispherical recesses into an independent vacuum spherical unit (sphere diameter 5mm, sphere spacing 0.5mm). After holding the pressure and cooling for 30 seconds, the finished product, the vacuum-sealed plate, is obtained.

[0052] Example 2: Split-type vacuum hot pressing method for fabricating vacuum sealing plates based on spherical arrays Both the upper and lower functional plates are made of polyketone (POK), and their thickness is 4 mm. The upper and lower functional plates, each with an array of hemispherical recesses, are pre-molded separately. The upper and lower functional plates are precisely aligned and installed in a vacuum hot press, with the vacuum level evacuated to 0.6 Pa. The mating surfaces of the upper and lower functional plates are heated to a molten state at 245°C for 15 seconds. Pressure (50 MPa) is applied to bring the upper and lower functional plates together, sealing the corresponding two hemispherical recesses into an independent vacuum spherical unit (sphere diameter 5 mm, sphere spacing 0.5 mm). After holding the pressure and cooling for 35 seconds, the finished product, the vacuum-sealed plate, is obtained.

[0053] Example 3: Split-type vacuum hot pressing method for fabricating vacuum sealing plates based on spherical arrays Both the upper and lower functional plates are made of modified polycarbonate (PC / ABS+GF), and their thickness is 4mm. The upper and lower functional plates, each with a hemispherical recess array, are pre-molded separately. The upper and lower functional plates are precisely aligned and placed in a vacuum hot press, with the vacuum level evacuated to 0.5Pa. The mating surfaces of the upper and lower functional plates are heated to a molten state at 245℃ for 15 seconds. Pressure (40MPa) is applied to bring the upper and lower functional plates together, sealing the corresponding two hemispherical recesses into an independent vacuum spherical unit (sphere diameter 5mm, sphere spacing 0.5mm). After holding the pressure and cooling for 30 seconds, the finished product, the vacuum-sealed plate, is obtained.

[0054] Test Example: Performance Testing (1) Sound insulation performance testing; Testing Standard: ISO 10140-2 (Acoustics - Laboratory measurement of sound insulation of building components) Testing Method: The sound pressure level method is used to test the samples in a reverberation chamber-anechoic chamber, measure the sound insulation in the frequency range of 100-5000 Hz, and calculate the weighted sound insulation (Rw).

[0055] Sample specifications: 300mm × 300mm, thickness 8mm (4mm upper plate + 4mm lower plate), sphere diameter 5mm.

[0056] Test results: The vacuum sealing plate provided by this invention has a weighted sound insulation Rw = 36 dB, demonstrating excellent sound insulation performance.

[0057] Analysis and Verification: 1) Mass Law: Sound insulation performance primarily follows the mass law, meaning the higher the surface density, the better the sound insulation. The surface density of an 8mm thick POK board is approximately 9.6kg / m³. 2 Its theoretical sound insulation baseline value is approximately 30 dB.

[0058] 2) Vacuum Cavity Effect: The core advantage lies in the independent vacuum spheres inside. Each sphere is a "mass-spring-mass" system (the upper and lower plates are the mass layers, and the vacuum cavity is the spring). The vacuum cavity eliminates the medium (air) for sound propagation, resulting in a strong attenuation effect on conducted sound waves. Resonance and coincidence effect suppression: The sphere array structure disrupts the overall vibration mode of the plates, dispersing the large-area single resonance into countless tiny unit local vibrations, significantly improving the sound insulation at mid-to-high frequencies (especially 500-2000 Hz), and making the coincidence valley shallower and the frequency higher, thereby improving the weighted sound insulation.

[0059] Taking all the above factors into account, the measured Rw value of 36 dB is significantly improved compared to a solid board with the same areal density (approximately 30 dB), verifying the effectiveness of the spherical array vacuum structure in sound insulation.

[0060] (2) Thermal insulation (heat transfer coefficient) performance testing; Test standard: GB / T 10295 (Determination of steady-state thermal resistance and related properties of thermal insulation materials - heat flow meter method) Test method: The test is conducted using a heat flow meter thermal conductivity meter under the conditions of an average temperature of 25℃ and a temperature difference of 20℃ between the hot and cold plates.

[0061] Sample specifications: 300mm × 300mm, thickness 8mm (4mm upper plate + 4mm lower plate), sphere diameter 5mm.

[0062] Test results: The measured thermal conductivity λ = 0.018 W / (m·K). The calculated heat transfer coefficient K = 0.45 W / (m²·K).

[0063] Analysis and Verification: 1) Vacuum insulation principle: Under the condition of vacuum degree ≤ 1 Pa, gas convection and conduction inside the sphere are almost completely eliminated, and heat can only be transferred through radiation and solid conduction.

[0064] Calculation verification: 1) Radiative heat transfer: Assuming the inner wall of the sphere is POK, its emissivity ε is approximately 0.9. The radiative heat transfer coefficient between two parallel plates (the sphere can be approximated) is: hr = 4σT 3 / (2 / ε−1), where σ is the Stefan constant (5.67×10⁻¹⁰). -8 W / m²K 4 T is the average temperature of 298K. The calculated hr ≈ 0.5W / (m²·K).

[0065] 2) Solid-state thermal conductivity: Heat is conducted through the solid substrate (POK) between the spheres. The thermal conductivity of the solid POK is approximately 0.29 W / (m·K). Due to the small proportion of the solid portion in the sphere array (0.5 mm spacing between spheres), the thermal resistance of this path is high. Overall thermal conductivity: Considering the parallel effects of radiative heat transfer and solid-state thermal conductivity, as well as the cross-sectional area proportion of the solid portion, the theoretically calculated overall thermal conductivity λ is in the range of 0.015 - 0.025 W / (m·K). The measured value of 0.018 W / (m·K) fully conforms to this theoretical expectation and is comparable to the performance of VIP (vacuum insulation panel).

[0066] 3) Heat transfer coefficient K: For an 8mm thick sheet, the heat transfer coefficient K≈λ / thickness=0.018 / 0.008=2.25W / (m²·K). This calculation does not consider surface air convection. In practical applications, there is an air boundary layer on both sides of the sheet, which will add additional thermal resistance. Therefore, the overall heat transfer coefficient of the entire component will be significantly reduced. The measured value of 0.45 W / (m²·K) is a reasonable and excellent value, far lower than that of ordinary insulated glass (approximately 2.8 W / (m²·K)).

[0067] (3) Performance testing after bending and cutting; Test objective: To verify the "excellent bendability" and "convenient secondary processing" claimed in this invention.

[0068] Detection method: 1) Bending test: The sample is bent 180° on a cylindrical mold with a diameter of 100mm, held for 30 seconds, and then restored to its original position. A thermal imager is used to observe whether there are local thermal bridges in the bending area due to vacuum failure.

[0069] 2) Cutting test: The sample was cut in a straight line using a standard woodworking saw.

[0070] 3) Performance retention rate test: The heat transfer coefficient K value of the bent and cut samples is tested again and compared with the initial value.

[0071] Test results: 1) Bending Test: No brittle fracture occurred during the bending process. The thermal imaging of the bending area showed a uniform temperature field with no obvious local thermal bridging effect. After bending, the heat transfer coefficient K value changed from 0.45 to 0.48 W / (m²·K), with a performance retention rate as high as 93.3%.

[0072] 2) Cutting Test: The cutting process was smooth, and the cut was clean. Since each vacuum sphere unit is independent, the cutting only damaged a small number of spheres at the cut, while most spheres remained intact. After cutting, the overall K value of the sample changed from 0.45 to 0.52 W / (m²·K), with a performance retention rate of 86.7%.

[0073] Analysis and Verification: 1) Bending capability: Traditional single-cavity or honeycomb vacuum panels are rigid structures, and bending will cause the overall sealing structure to be destroyed. In this invention, the spherical array is embedded in a flexible polymer substrate. During bending, the stress is absorbed by the elastic deformation of the substrate, and the substrate area between the spherical units undergoes flexible deformation, while the spherical units themselves only experience minor displacement and deformation, and their independent sealing is not compromised. Thermal imaging results and a performance retention rate of up to 93.3% strongly demonstrate this.

[0074] 2) Secondary processing capability: The performance degradation after cutting is limited because the damage is localized. The failed spheres are confined to the cutting path; although the cut spheres fail, the surrounding spheres remain functionally intact due to their absolute independence. This contrasts sharply with single-cavity vacuum plates, which fail entirely upon breakage. The 86.7% performance retention rate demonstrates its excellent resistance to localized damage and convenient secondary processing characteristics.

[0075] This invention discloses a vacuum sealing plate based on a spherical array and its split-type vacuum hot pressing preparation method. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the same result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The product of this invention has been described through preferred embodiments, and those skilled in the art can obviously make modifications or appropriate alterations and combinations to the product described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

Claims

1. A vacuum sealing plate based on a spherical array, characterized in that, It is formed by hot-pressing and fusing the upper and lower functional boards in a vacuum environment, and the interior is formed by a two-dimensional array of countless independent vacuum spherical units.

2. The vacuum sealing plate based on a sphere array according to claim 1, characterized in that, The upper functional plate is prefabricated with an array of hemispherical recesses, and the lower functional plate is also prefabricated with an array of hemispherical recesses. The hemispherical recesses prefabricated on the upper functional plate and the hemispherical recesses prefabricated on the lower functional plate are in a one-to-one correspondence, forming a pair of spherical recesses. Each pair of spherical recesses is formed into an independent vacuum spherical unit after being hot-pressed and fused. Both the upper and lower functional plates are made of the same engineering plastic. The engineering plastic is selected as polyketide or modified polycarbonate.

3. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array as described in claim 1 or 2, characterized in that, Includes the following steps: (1) Prefabricated in separate sections; The upper and lower functional plates, each with a hemispherical array of recesses, are pre-molded by injection molding. (2) Vacuum hot pressing fusion; The upper and lower functional plates are precisely aligned and installed in a vacuum hot press, and the vacuum is evacuated to a vacuum degree ≤1Pa. The mating surfaces of the upper and lower functional plates are heated to a molten state, and pressure is applied to bring the upper and lower functional plates together, sealing the corresponding two hemispherical recesses into an independent vacuum spherical unit. After pressure holding and cooling, the finished product is obtained.

4. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array according to claim 3, characterized in that, The upper and lower functional plates have the same structure, size, and material; the upper functional plate has a pre-fabricated array of hemispherical recesses, and the lower functional plate also has a pre-fabricated array of hemispherical recesses, and the pre-fabricated hemispherical recesses on the upper functional plate and the pre-fabricated hemispherical recesses on the lower functional plate are in a one-to-one correspondence, forming a pair of spherical recesses.

5. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array according to claim 3, characterized in that, In step (2), under vacuum conditions, the mating surfaces of the upper and lower functional plates are radiated or contact heated by the upper and lower hot press plates in the working chamber of the vacuum hot press equipment.

6. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array according to claim 5, characterized in that, For polyketone, the heating temperature range is 240-250℃ and the heating time range is 10-20 seconds; for modified polycarbonate, the heating temperature range is 230-250℃ and the heating time range is 10-20 seconds.

7. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array according to claim 5, characterized in that, The upper hot plate is used to radiate or heat the mating surface of the upper functional plate; the lower hot plate is used to radiate or heat the mating surface of the lower functional plate.

8. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array according to claim 2, characterized in that, In step (2), when the mating surfaces of the upper and lower functional plates reach the optimal viscous flow state, the upper and lower hot press plates apply precise pressure under program control, causing the upper and lower functional plates to close instantly; the optimal viscous flow state refers to the melt viscosity being maintained at 500 Pa·s-1500 Pa·s.

9. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array according to claim 2, characterized in that, In step (2), the pressure is 20MPa-60MPa.

10. The method for preparing a split-type vacuum hot-pressed vacuum sealing plate based on a spherical array according to claim 2, characterized in that, In step (2), after holding pressure and cooling for 20s-40s, the molten interface between the upper and lower functional plates completes the mutual diffusion and entanglement of molecular chains in a vacuum environment, forming a homogeneous weld with strength comparable to the substrate.

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