Anti-deformation plate and preparation method thereof

Abstract

The invention discloses an anti-deformation plate and a preparation method thereof.The anti-deformation plate comprises an upper reinforcing layer, a honeycomb core layer and a lower reinforcing layer which are sequentially stacked from top to bottom, the anti-deformation plate further comprises an adhesive layer, the honeycomb core layer comprises a plurality of first hexagonal reinforcing frames distributed alternately, and honeycomb stabilizing cavities are formed in the first reinforcing frames; a first cross connecting plate, a second cross connecting plate and a third cross connecting plate are arranged in the middle of the honeycomb stabilizing cavity, the first cross connecting plate, the second cross connecting plate and the third cross connecting plate are connected in a cross mode to form a plurality of triangular compression-resistant units, first reinforcing ribs arranged in parallel are embedded in the upper reinforcing layer, and second reinforcing ribs arranged in parallel are embedded in the lower reinforcing layer. And the honeycomb core layer is bonded with the upper reinforcing layer and the lower reinforcing layer through modified adhesive layers. A plurality of crossed connecting plates are arranged in the honeycomb core layer to form the triangular compression-resistant units, the design of the reinforcing ribs is combined, so that the torsional strength of the plate is greatly improved, and the local buckling critical load is improved to two times that of a conventional honeycomb structure through the triangular compression-resistant units.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite boards, and particularly relates to an anti-deformation board and a preparation method thereof. Background Art

[0002] Composite boards are boards composed of two or more materials with different properties through a specific process, including metal composite boards applied in industries such as anti-corrosion, pressure vessel manufacturing, electric power construction, petrochemical industry, medicine, light industry, and automobile; wood-based composite boards with a particleboard or fiberboard core and veneers glued on both sides, having greater stiffness and good stability; color steel composite boards composed of color steel plates and thermal insulation core materials, having good thermal insulation performance and beautiful appearance; wood-plastic composite boards formed by combining wood chips, thin boards, and plastics through an adhesive; fiberglass composite boards made by synthesizing fiberglass products and resins; aluminum-plastic composite boards formed by hot extrusion of upper and lower aluminum plates and a middle mineral-filled core material; stainless steel composite boards with a low-carbon steel substrate and a stainless steel thin plate on the surface, combining the beauty and corrosion resistance of stainless steel with the strength and workability of steel.

[0003] The existing anti-deformation boards mainly have the following technical defects: 1. Single structure leads to insufficient anti-torsion: Although conventional multi-layer boards use a honeycomb structure for reinforcement, the core layer only relies on a single honeycomb design and is still prone to torsional deformation under complex stresses, especially in the high-low temperature alternating environment, the interface is prone to delamination. 2. Weak interface bonding of reinforcing fibers: The glass fiber / polyester fiber composite felt absorbs impact energy through a thermoplastic network, but the interfacial bonding strength between the fiber and the resin is insufficient, and peeling is prone to occur under long-term loads, resulting in warping of the board. 3. Inaccurate process control: In the traditional hot pressing process, the temperature-pressure parameters are not optimized in coordination with the core layer perforation rate, resulting in uneven resin flow, large residual stress in the finished product, and potential deformation hazards still exist after sanding. 4. Contradiction between function and lightweight: Although the PET foam core layer reduces weight, the through-hole structure weakens the axial stiffness and cannot balance the requirements of sound absorption and compression resistance, limiting its application in building curtain walls.

[0004] Chinese Patent CN117681527A discloses an anti-torsion deformation board, which includes: a board body, the board body is composed of multi-layer boards, and from top to bottom, it is an upper reinforcement board, a middle reinforcement board, and a lower reinforcement board in sequence; a first reinforcement rib is embedded on the upper reinforcement board; a second reinforcement rib is arranged in the inner cavity of the lower reinforcement board; the middle reinforcement board is composed of multiple frames, the frames on the middle reinforcement board include a first reinforcement frame and a second reinforcement frame, the first reinforcement frame and the second reinforcement frame are alternately distributed to form the middle reinforcement board, and the inner cavities of the first reinforcement frame and the second reinforcement frame both include multiple adjacent honeycomb stabilizing cavities. This solution can strengthen the strength of the top and bottom surfaces of the board body, and utilize the honeycomb structure of the honeycomb stabilizing cavity to evenly distribute the external forces received, but such boards cannot combine lightweight.

[0005] Therefore, there is an urgent need to develop a composite plate structure and its preparation method with high torsional stiffness, lightweight, stable interface and controllable process. Summary of the Invention

[0006] Aiming at the problems raised in the above background technology, the purpose of the present invention is to provide a deformation-resistant plate and its preparation method, which have high torsional stiffness, lightweight, stable interface and controllable process.

[0007] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0008] A deformation-resistant plate includes an upper reinforcement layer, a honeycomb core layer and a lower reinforcement layer stacked in sequence from top to bottom, and also includes an adhesive layer. The honeycomb core layer includes a plurality of alternately distributed hexagonal reinforcement frames I, and each reinforcement frame I is internally provided with a honeycomb stable cavity. In the middle of the honeycomb stable cavity, there are cross-connecting plates I, II and III, which are cross-connected with each other to form a plurality of triangular compressive units. The upper reinforcement layer is embedded with parallel arranged reinforcement bars I, and the lower reinforcement layer is embedded with parallel arranged reinforcement bars II; the honeycomb core layer is bonded to the upper and lower reinforcement layers through a modified adhesive layer.

[0009] Further defined, the adhesive layer contains 40-50wt% phenolic resin glue, 20-30wt% modified silicone sealant and 30-40wt% low melting point polyester fiber.

[0010] Further defined, the cross-sections of the reinforcement bars I and II are rectangular or arc-shaped, the center distance between adjacent reinforcement bars is 20-50mm, the material of the honeycomb core layer is PET foaming material, the density is 80-150kg / m 3 [ , the through-hole diameter is 5-18mm, the perforation rate is 20-30%, and the core layer thickness is 9-36mm.

[0011] Further defined, the upper and lower reinforcement layers are glass fiber or polyester fiber needle punched felts, the glass fiber content is 70-95wt%, the polyester fiber content is 5-30wt%, the thickness of the upper and lower reinforcement layers is 2-5mm, and the glass fiber or polyester fiber needle punched felts are doped with carbon nanotube modified fibers, and the doping amount is 1-3% of the total fiber weight, and the fiber length is 50-200mm.

[0012] Further defined, the triangular compressive unit is filled with flame-retardant polyurethane foam or expanded graphite, and the filling rate is 85-95% of the cavity volume of the triangular compressive unit.

[0013] A preparation method of a deformation-resistant plate includes the following steps:

[0014] S1 Honeycomb core layer treatment: The PET foam board with a density of 80 - 150 kg / m 3 is numerically controlled to punch holes to form a base material with a perforation rate of 20 - 30%, and the through-hole diameter is 5 - 18 mm; then it is impregnated with phenolic resin containing 10 - 15% nano-silica, preheated at 80°C for 5 min and then placed in a mold, and pre-pressed at 160°C and 2 MPa to form a honeycomb core layer framework;

[0015] S2 Reinforcement layer preparation: Double-sided spraying of an adhesive layer on the fiberglass or polyester fiber needle punched felt, and arranging reinforcing rib one in a directional manner on the upper reinforcement layer and reinforcing rib two on the lower reinforcement layer during paving;

[0016] S3 Composite molding: Sequentially stack the lower reinforcement layer, the honeycomb core layer, and the upper reinforcement layer;

[0017] S4 Stepwise hot pressing: In the first stage, at 100°C, 2 MPa, and for 30 min, the adhesive melts and penetrates; in the second stage, the temperature is raised to 140°C, 5 MPa, and for 40 min to achieve interfacial crosslinking; in the third stage, at 160°C, 3 MPa, and for 60 min to complete curing.

[0018] Further defined, in the S4 stepwise hot pressing, when the total thickness of the plate > 20 mm, the pressure in the second stage is increased to 6 - 8 MPa, and the time is extended to 50 - 60 min; after the third stage, a temperature reduction and pressure holding step is added, and the temperature reduction and pressure holding step cools to 80°C at a rate of 1°C / min, and the pressure is maintained at 1 - 2 MPa during this period.

[0019] Further defined, the spraying process of the adhesive layer uses a two-component spray gun. Component A is a mixture of phenolic resin glue and modified silicone sealant, with a weight percentage of 60 - 80 wt%, and component B is low-melting-point polyester fiber powder, with a weight percentage of 20 - 40 wt%. Before spraying, components A and B are mixed in a mixing chamber at a volume ratio of 10:1.

[0020] Further defined, after pre-pressing, the honeycomb core layer needs to be carbonized. The carbonization treatment includes heating to 250°C at a rate of 5°C / min under inert gas protection, with a holding time of not less than 30 min, and then cooling to below 50°C at a rate of 10°C / min.

[0021] Further defined, the paving of the reinforcing rib one and the reinforcing rib two uses ultrasonic vibration-assisted positioning, with a vibration frequency of 20 kHz, an amplitude of 5 - 10 μm, and a duration of not less than 30 s.

[0022] Advantages of the present invention:

[0023] Torsional stiffness improvement: Multiple cross - connecting plates arranged within the honeycomb core layer form triangular compressive units. In combination with the rib design, the torsional strength of the plate is significantly enhanced. The triangular compressive units increase the local buckling critical load to twice that of a conventional honeycomb structure.

[0024] Interface stability optimization: Through the hot - pressing process, low - melting - point polyester fibers melt and penetrate into the micropores of the fiberglass felt during hot - pressing, resulting in an interlayer peel strength of 12 N / mm 2 , which is significantly improved compared to traditional phenolic bonding.

[0025] Process - coordinated control of deformation: By matching the three - stage hot - pressing parameters with the perforation rate of the honeycomb core layer and the change in resin viscosity, the residual stress of the finished product is reduced. Description of the Drawings

[0026] The present invention can be further illustrated by non - limiting embodiments given in the drawings;

[0027] Figure 1 It is a schematic structural view of the honeycomb core layer of an anti - deformation plate and its preparation method according to an embodiment of the present invention;

[0028] Figure 2 It is a top view of the honeycomb core layer of an anti - deformation plate and its preparation method according to an embodiment of the present invention;

[0029] Figure 3 It is a front view of an anti - deformation plate and its preparation method according to an embodiment of the present invention;

[0030] Figure 4 It is a schematic structural view of the upper reinforcing layer of an anti - deformation plate and its preparation method according to an embodiment of the present invention;

[0031] Figure 5 It is a schematic structural view of the lower reinforcing layer of an anti - deformation plate and its preparation method according to an embodiment of the present invention.

[0032] The main element symbols are explained as follows: upper reinforcing layer 1, honeycomb core layer 2, lower reinforcing layer 3, adhesive layer 4, first reinforcing rib 11, first reinforcing frame 21, honeycomb stable cavity 23, first cross - connecting plate 24, second cross - connecting plate 25, triangular compressive unit 26, third cross - connecting plate 27, second reinforcing rib 31. Detailed Embodiments

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figure 1 shown, an anti-deformation sheet of the present invention includes an upper reinforcing layer 1, a honeycomb core layer 2, and a lower reinforcing layer 3 that are laminated in sequence from top to bottom. It also includes an adhesive layer 4. The honeycomb core layer 2 includes a plurality of alternately distributed hexagonal reinforcing frames one 21. A honeycomb stabilizing cavity 23 is provided inside each of the reinforcing frames one 21. A cross connecting plate one 24, a cross connecting plate two 25, and a cross connecting plate three 27 are provided in the middle of the honeycomb stabilizing cavity 23. The cross connecting plate one 24, the cross connecting plate two 25, and the cross connecting plate three 27 are cross-connected to each other to form a plurality of triangular compression units 26. The upper reinforcing layer 1 is embedded with parallel arranged reinforcing ribs one 11, and the lower reinforcing layer 3 is embedded with parallel arranged reinforcing ribs two 31. The honeycomb core layer 2 is bonded to the upper reinforcing layer 1 and the lower reinforcing layer 3 through a modified adhesive layer 4.

[0037] Further defined, the adhesive layer 4 comprises 40-50 wt% phenolic resin glue, 20-30 wt% modified silicone sealant, and 30-40 wt% low melting point polyester fibers.

[0038] Further defined, the cross-section of the first reinforcing rib 11 and the second reinforcing rib 31 is rectangular or arc-shaped, the center distance between adjacent reinforcing ribs is 20-50 mm, the material of the honeycomb core layer 2 is PET foam material, and the density is 80-150 kg / m 3 , the through-hole diameter is 5-18 mm, the perforation rate is 20-30%, and the core layer thickness is 9-36 mm.

[0039] Further defined, the upper reinforcing layer 1 and the lower reinforcing layer 3 are glass fiber or polyester fiber needle punched felts, the glass fiber content is 70-95 wt%, the polyester fiber content is 5-30 wt%, the thickness of the upper reinforcing layer 1 and the lower reinforcing layer 3 is 2-5 mm, and the glass fiber or polyester fiber needle punched felts are doped with carbon nanotube modified fibers, and the doping amount is 1-3% of the total fiber weight, and the fiber length is 50-200 mm.

[0040] Further defined, the triangular compression unit 26 is filled with flame retardant polyurethane foam or expanded graphite, and the filling rate is 85-95% of the cavity volume of the triangular compression unit 26.

[0041] A preparation method of an anti-deformation plate, comprising the following steps:

[0042] S1 Honeycomb core layer 2 treatment: The PET foam board with a density of 80-150 kg / m 3 is subjected to numerical control punching to form a base material with a perforation rate of 20-30%, and the through-hole diameter is 5-18 mm; then it is impregnated with phenolic resin containing 10-15% nano-silica, preheated at 80 °C for 5 min and then placed in a mold, and pre-pressed at 160 °C and 2 MPa to form the honeycomb core layer 2 frame;

[0043] S2 Reinforcing layer preparation: The glass fiber or polyester fiber needle punched felt is spray-coated with the adhesive layer 4 on both sides. When paving, the first reinforcing rib 11 is arranged in a directional manner on the upper reinforcing layer 1, and the second reinforcing rib 31 is arranged on the lower reinforcing layer 3;

[0044] S3 Composite molding: Stack the lower reinforcing layer 3, the honeycomb core layer 2, and the upper reinforcing layer 1 in sequence;

[0045] S4 Stage-by-stage hot pressing: In the first stage, at 100 °C, 2 MPa, and 30 min, the adhesive melts and penetrates; in the second stage, the temperature is raised to 140 °C, 5 MPa, and 40 min to achieve interface cross-linking; in the third stage, at 160 °C, 3 MPa, and 60 min, the curing is completed.

[0046] In the practical application of this embodiment, in the S4 staged hot pressing, when the total thickness of the board > 20 mm, the pressure in the second stage is increased to 6 - 8 MPa, and the time is extended to 50 - 60 min; after the third stage, a temperature reduction and pressure holding step is added. In the temperature reduction and pressure holding step, the temperature is reduced to 80 °C at a rate of 1 °C / min, and the pressure is maintained at 1 - 2 MPa during this period.

[0047] In the practical application of this embodiment, a two-component spray gun is used in the spraying process of the adhesive layer 4. Component A is a mixture of phenolic resin glue and modified silicone sealant, with a weight percentage of 60 - 80 wt%, and component B is low-melting-point polyester fiber powder, with a weight percentage of 20 - 40 wt%. Before spraying, components A and B are mixed in the mixing chamber at a volume ratio of 10:1.

[0048] In the practical application of this embodiment, after pre-pressing, the honeycomb core layer 2 needs to be carbonized. The carbonization treatment includes heating to 250 °C at a rate of 5 °C / min under the protection of inert gas, with a holding time of not less than 30 min, and then cooling to below 50 °C at a rate of 10 °C / min.

[0049] In the practical application of this embodiment, the laying of the first reinforcing rib 11 and the second reinforcing rib 31 is assisted by ultrasonic vibration for positioning, with a vibration frequency of 20 kHz, an amplitude of 5 - 10 μm, and a duration of not less than 30 s.

[0050] The working principle of the present invention is as follows:

[0051] The core mechanism for anti-deformation is as follows:

[0052] Triangular compression unit: In the honeycomb core layer 2, cross-connecting plates one 24, cross-connecting plates two 25, and cross-connecting plates three 27 are arranged to form a 60° diagonal support, converting the vertical pressure into internal shear force of the core layer.

[0053] [[ID=2|1]]Interface stability control: By using low-melting-point polyester fibers (melting point 110 - 120 °C) to melt in the second stage of hot pressing and infiltrate into the micropores of the glass fiber mat (diameter 5 - 20 μm), a "resin - fiber" mechanical interlocking structure is formed after cooling to prevent interlayer slip.

[0054] Thermal deformation cancellation: The modified silicone sealant (thermal expansion coefficient 28×10 -6 / °C) and the PET foam core layer (thermal expansion coefficient 65×10 -6 / °C) form a reverse deformation trend, and the net deformation amount is reduced by 72% in the temperature range of -20 to 80 °C.

[0055] The principle of process coordination is as follows:

[0056]

[0057] Second, the quantitative comparison of technical effects is as follows:

[0058]

[0059] Example 1: Building exterior wall curtain panel

[0060] Structural improvement: The reinforcing rib 11 is made of shape memory alloy. The memory alloy is NiTiNb with a phase change temperature of -10°C, and it spontaneously shrinks at low temperature to compensate for the shrinkage of PET;

[0061] Test location: A high-rise building in Harbin (winter -32°C, summer 35°C);

[0062] Test results: The maximum deflection within 3 years is 1.05 mm (4.3 mm for traditional plates), and the thermal bridge effect is reduced by 40%.

[0063] Example 2: Fireproof partition panel

[0064] The same parts as in Example 1 will not be described in detail. The differences are as follows: Zinc borate (10 wt%) is added to the adhesive layer 4, and the effect of this design is that a borosilicate glass layer can be formed at 300°C to isolate oxygen;

[0065] Fire resistance test: According to the standard of GB / T9978.1-2008, the back temperature ≤ 150°C within 120 min (the national standard requirement is ≤ 180°C);

[0066] Test results: The flue gas toxicity index Ga ≤ 0.5 (the standard requirement is ≤ 1.0).

[0067] Example 3: Furniture table top panel

[0068] The same parts as in Example 1 will not be described in detail. The differences are as follows: The upper reinforcing layer 1 and the lower reinforcing layer 3 are coated with a titanium dioxide / silver nanoparticle composite coating, and the thickness of this composite coating is 0.2 mm.

[0069] Antibacterial verification:

[0070] Strain Escherichia coli Staphylococcus aureus Bacteriostatic rate (24h) 99.2％ 98.7％

[0071] The above examples only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above examples without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An anti-deformation sheet, comprising an upper reinforcing layer (1), a honeycomb core layer (2) and a lower reinforcing layer (3) laminated in sequence from top to bottom, characterized in that: It further includes an adhesive layer (4). The honeycomb core layer (2) includes a plurality of alternately distributed first hexagonal reinforcing frames (21). A honeycomb stabilizing cavity (23) is provided inside each of the first hexagonal reinforcing frames (21). A first cross-connecting plate (24), a second cross-connecting plate (25), and a third cross-connecting plate (27) are provided in the middle of the honeycomb stabilizing cavity (23). The first cross-connecting plate (24), the second cross-connecting plate (25), and the third cross-connecting plate (27) are cross-connected to form a plurality of triangular compression units (26). The upper reinforcing layer (1) is embedded with first reinforcing ribs (11) arranged in parallel. The lower reinforcing layer (3) is embedded with second reinforcing ribs (31) arranged in parallel. The honeycomb core layer (2) is bonded to the upper reinforcing layer (1) and the lower reinforcing layer (3) through a modified adhesive layer (4).

2. The anti-deformation plate according to claim 1, characterized in that: The adhesive layer (4) contains 40-50 wt% phenolic resin adhesive, 20-30 wt% modified silicone sealant, and 30-40 wt% low melting point polyester fibers.

3. The anti-deformation sheet according to claim 1, characterized in that: The cross-sections of the first reinforcing rib (11) and the second reinforcing rib (31) are rectangular or arc-shaped, and the center distance between adjacent reinforcing ribs is 20-50 mm. The material of the honeycomb core layer (2) is PET foam material, with a density of 80-150 kg / m 3 , the through-hole diameter is 5-18 mm, the perforation rate is 20-30%, and the core layer thickness is 9-36 mm.

4. An anti-deformation sheet according to claim 1, characterized in that: The upper reinforcing layer (1) and the lower reinforcing layer (3) are glass fiber or polyester fiber needle punched felts. The glass fiber content is 70-95 wt%, the polyester fiber content is 5-30 wt%. The thickness of the upper reinforcing layer (1) and the lower reinforcing layer (3) is 2-5 mm. The glass fiber or polyester fiber needle punched felts are doped with carbon nanotube modified fibers, and the doping amount is 1-3% of the total fiber weight, and the fiber length is 50-200 mm.

5. An anti-deformation plate according to claim 1, characterized in that: The triangular compression unit (26) is filled with flame retardant polyurethane foam or expanded graphite, and the filling rate is 85-95% of the cavity volume of the triangular compression unit (26).

6. A preparation method of an anti-deformation sheet, characterized in that: It includes the following steps: S1 Honeycomb core layer (2) treatment: A PET foam board with a density of 80 - 150 kg / m 3 is subjected to numerical control punching to form a base material with a perforation rate of 20 - 30%, and the through-hole diameter is 5 - 18 mm; then it is impregnated with a phenolic resin containing 10 - 15% nano-silica, preheated at 80°C for 5 min and then placed in a mold, and pre-pressed at 160°C and 2 MPa to form the honeycomb core layer (2) framework; S2 Reinforcing layer preparation: Double-sidedly spray the adhesive layer (4) on the glass fiber or polyester fiber needle punched felt. When paving, arrange the first reinforcing ribs (11) in a directional manner on the upper reinforcing layer (1), and arrange the second reinforcing ribs (31) on the lower reinforcing layer (3). S3 Composite molding: Stack the lower reinforcing layer (3), the honeycomb core layer (2), and the upper reinforcing layer (1) in sequence. S4 Step-by-step hot pressing: In the first stage, at 100 °C, 2 MPa, and for 30 min, the adhesive infiltrates; in the second stage, the temperature is raised to 140 °C, 5 MPa, and for 40 min to achieve interfacial crosslinking; in the third stage, at 160 °C, 3 MPa, and for 60 min to complete curing.

7. The preparation method of a deformation-resistant sheet according to claim 6, characterized in that: In the S4 step-by-step hot pressing, when the total thickness of the plate > 20 mm, the pressure in the second stage is increased to 6-8 MPa, and the time is extended to 50-60 min; after the third stage, a cooling and pressure maintaining step is added. In the cooling and pressure maintaining step, the temperature is decreased to 80 °C at a rate of 1 °C / min, and the pressure is maintained at 1-2 MPa during this period.

8. The preparation method of an anti-deformation sheet according to claim 6, characterized in that: In the spraying process of the adhesive layer (4), a two-component spray gun is used. Component A is a mixture of phenolic resin adhesive and modified silicone sealant, with a weight percentage of 60-80 wt%. Component B is low melting point polyester fiber powder, with a weight percentage of 20-40 wt%. Before spraying, components A and B are mixed in the mixing chamber at a volume ratio of 10:

1.

9. The preparation method of an anti-deformation sheet according to claim 6, characterized in that: After pre-pressing, the honeycomb core layer (2) needs to be carbonized. The carbonization process includes heating to 250°C at a rate of 5°C / min under the protection of inert gas, maintaining the temperature for no less than 30 minutes, and then cooling to below 50°C at a rate of 10°C / min.

10. The preparation method of a deformation-resistant sheet according to claim 6, characterized in that: The laying of the first reinforcing rib (11) and the second reinforcing rib (31) is assisted by ultrasonic vibration for positioning, with a vibration frequency of 20 kHz, an amplitude of 5-10 μm, and a duration of no less than 30 s.

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