High-strength composite polyurethane foam board

Abstract

The invention relates to a high-strength composite polyurethane foam board which is formed by stacking a lower foam layer, a middle foam layer and an upper foam layer, the overall mechanical strength is enhanced through an upper reinforcing net and a lower reinforcing net, and through carbon nanotubes evenly distributed in the foam layers, the mechanical property and toughness of the material are improved; an efficient charge transfer channel is also constructed to support a unique self-repairing function, and a polyurethane chain segment connected by reversible chemical bonds is contained in the foam board, so that the foam board can be broken and reformed to realize self-repairing when being damaged; the catalytic activity functional group modified on the surface of the carbon nano tube further accelerates the dynamic chemical bond recombination process between polyurethane chain segments, so that the self-repairing speed and efficiency are remarkably improved, when the foam board is damaged, an electric signal conducted by the carbon nano tube triggers the self-repairing process, and the self-repairing effect is improved. And a signal is quickly and accurately transmitted to a control system through the quick connector, so that the foam board can automatically restore to the original shape after being slightly damaged.

Description

Technical Field

[0001] The invention relates to a high-strength composite polyurethane foam board, in particular to a high-strength composite polyurethane foam board applied in the technical field of polyurethane foam boards. Background Art

[0002] Chinese invention patent CN114193894 discloses a composite thermal insulation material of modified polyurethane foam and a preparation method thereof. Although the overall strength and thermal insulation performance of the material are enhanced by the design of the foamed cement layer and the connecting part, solving the problem of insufficient compressive strength of traditional polyurethane foam, it still has some limitations in practical applications, such as the inability to achieve self-repair and the lack of real-time monitoring capability of internal damage. In addition, in extreme environments or during long-term use, microcracks and other difficult-to-detect damage may occur inside the composite material, which may cause the material performance to gradually decline.

[0003] Chinese invention patent CN110643011 proposes a high-strength polyurethane foam composition with high compressive strength and excellent flame retardant properties. However, this design does not include self-healing properties and intelligent monitoring functions, and the product's ability to recover after damage and maintenance cost optimization need to be improved.

[0004] The above design improves the basic mechanical properties and functionality of polyurethane foam, but there is still room for improvement in dealing with durability issues under complex working conditions, enhancing service life and reducing maintenance costs. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a composite polyurethane foam board with high strength, self-repair function and intelligent monitoring system, aiming to effectively overcome the problems of polyurethane foam boards in the prior art facing stress shock, performance degradation due to long-term use, and difficulty in repair after damage, thereby improving the durability and reliability of the product, and reducing its maintenance cost throughout its life cycle, meeting the stringent requirements of high-performance application fields.

[0006] In order to solve the above problems, the present invention provides a high-strength composite polyurethane foam board, comprising a lower foam layer, a middle foam layer is arranged on the upper side of the lower foam layer, an upper foam layer is arranged on the upper side of the middle foam layer, the top and bottom ends of the lower foam layer, the middle foam layer and the upper foam layer are fixedly connected with an upper reinforcing net and a lower reinforcing net, the upper reinforcing nets and the lower reinforcing nets on the lower foam layer, the middle foam layer and the upper foam layer are fixedly connected with hinge points, a horizontal detection line and a vertical detection line are fixedly connected to the hinge point, the horizontal detection line and the vertical detection line are arranged perpendicular to each other, and the horizontal detection line and the vertical detection line are electrically connected to the hinge point, a plurality of carbon nanotubes are fixedly connected to the lower foam layer, the middle foam layer and the upper foam layer, and the plurality of carbon nanotubes are evenly distributed in the lower foam layer, the middle foam layer and the upper foam layer, The multiple carbon nanotubes are perpendicular to the lower foam layer, the middle foam layer and the upper foam layer, and the multiple carbon nanotubes penetrate the lower foam layer, the middle foam layer and the upper foam layer, the top and bottom ends of the multiple carbon nanotubes are electrically connected to the hinge points, the ends of the topmost and bottommost hinge points away from the lower foam layer are fixedly connected to the upper reinforcing net and the lower reinforcing net, the ends of the topmost and bottommost upper and lower reinforcing nets away from each other are fixedly connected to reinforcing plates, the two ends of the multiple transverse detection lines and the longitudinal detection lines are respectively fixedly connected to the same longitudinal detection rod and the transverse detection rod, the ends of the multiple longitudinal detection rods and the transverse detection rods away from the transverse detection lines and the longitudinal detection lines are fixedly connected to the same conductive strip, the two ends of the multiple conductive strips are fixedly connected to quick connectors, and the multiple quick connectors are electrically connected to an external control system.

[0007] In the above-mentioned high-strength composite polyurethane foam board, a synergistic improvement of multi-dimensional performance is achieved, integrating high strength, self-healing properties and intelligent monitoring system, which is suitable for high-performance application requirements in various harsh environments.

[0008] As a further improvement of the present application, the lower foam layer, the middle foam layer and the upper foam layer all include a matrix composed of polyurethane segments connected by reversible chemical bonds (such as hydrogen bonds, dynamic covalent bonds).

[0009] As a further improvement of the present application, the surface of the carbon nanotubes is modified with catalytically active functional groups, which can participate in and accelerate the self-repair reaction between polyurethane chain segments when damaged.

[0010] As a further improvement of the present application, electroactive molecules are embedded in the matrix, and the electroactive molecules can be activated under the action of externally applied current or voltage to promote the self-repair process.

[0011] As another improvement of the present application, the catalytically active functional group is specifically a metal ion, a metal complex or other active components that can catalyze the reorganization of dynamic chemical bonds between polyurethane chain segments.

[0012] As another improved supplement of the present application, the electroactive molecule is a conductive polymer, an ionic liquid or a compound containing a reversible cross-linking function.

[0013] As another improved supplement of the present application, the carbon nanotubes form a good interface bond with the polyurethane matrix through a specific surface modification method, and form a continuous conductive network inside the material.

[0014] As another improvement of the present application, the following steps are included: S1. Synthesizing a polyurethane prepolymer containing a reversible chemical bond; S2. Modifying catalytically active functional groups on the surface of carbon nanotubes; S3. Electroactive molecule formulation; S4. The modified carbon nanotubes are fully mixed with the polyurethane prepolymer, and a blowing agent, a catalyst and other additives are added to form a uniform foaming system; S5. Molding and curing, injecting the mixed foaming system into the mold to ensure that the carbon nanotubes are vertically and evenly distributed inside the foam; S6. Install the reinforcement structure. After the lower foam layer is initially cured, accurately paste and fix the lower reinforcement net on the top and bottom of the lower foam layer, and embed the hinge points at the corresponding positions to connect the horizontal detection line and the vertical detection line to ensure that the two are perpendicular to each other and achieve electrical contact; S7. Electrical connection: accurately fix both ends of all horizontal detection lines and vertical detection lines on the vertical detection rod and horizontal detection rod respectively, and ensure that these detection components are closely connected through conductive strips to form a complete internal monitoring network, and install quick connectors.

[0015] In summary, this application has the following beneficial effects: 1. Improved mechanical properties and enhanced toughness. By evenly distributing carbon nanotubes inside the composite polyurethane foam board, the overall strength and toughness of the material are effectively improved. The excellent mechanical properties, high modulus and good dispersibility of carbon nanotubes are conducive to stress transfer and dispersion, making the foam board have excellent compression, tensile and impact resistance.

[0016] 2. Self-repair function is realized. The foam board is composed of polyurethane segments containing reversible chemical bonds (such as hydrogen bonds or dynamic covalent bonds). When the material is damaged, these chemical bonds can break and reconnect to achieve self-repair. The catalytically active functional groups modified on the surface of carbon nanotubes accelerate the reorganization of dynamic chemical bonds between polyurethane segments, thereby greatly improving the self-repair reaction rate and efficiency.

[0017] 3. Intelligent monitoring and feedback mechanism. This design constructs a sensor network consisting of hinge points, transverse detection lines, longitudinal detection lines, longitudinal detection rods, transverse detection rods and conductive strips, which can monitor the stress state and structural integrity of each part of the foam board in real time. When the foam board is damaged, the electrical signal is transmitted to the external control system through the carbon nanotubes, realizing rapid identification and positioning of the damaged position, and can start the self-repair process as needed.

[0018] 4. Efficient energy transmission and optimized conductive performance. Multiple carbon nanotubes vertically penetrating the lower foam layer, middle foam layer and upper foam layer form a continuous conductive network, which not only provides the necessary energy support for the self-healing process, but also optimizes the electromagnetic shielding performance, thermal conductivity and antistatic ability of the overall material.

[0019] 5. Enhanced structural stability and durability: By adding upper reinforcement nets, lower reinforcement nets and reinforcement plates, the overall rigidity and stability of the foam board are enhanced, reducing the risk of deformation or damage that may occur under long-term use or extreme environmental conditions.

[0020] 6. Easy maintenance and extended service life. Due to its self-repair ability and intelligent monitoring function, the foam board can automatically restore to its original state when slightly damaged, which significantly reduces the maintenance frequency and cost and greatly extends the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the overall structure diagram of this application; Figure 2 The local structure of this application Figure 1 ; Figure 3 Partial explosion for this application Figure 1 ; Figure 4 The local structure of this application Figure 2 ; Figure 5 Partial explosion for this application Figure 2 ; Figure 6 The local structure of this application Figure 3 ; Figure 7 Partial explosion for this application Figure 3 ; Figure 8 This is the front view of the application; Fig. 9 It is the AA cross-sectional view of this application; Fig.10 This is a schematic diagram of the carbon nanotube structure of the present application.

[0022] Description of the numbers in the figure: 1. Lower foam layer; 2. Middle foam layer; 3. Upper foam layer; 4. Upper reinforcing net; 5. Lower reinforcing net; 6. Hinge point; 7. Horizontal detection line; 8. Longitudinal detection line; 9. Carbon nanotubes; 10. Reinforcement plate; 11. Longitudinal detection rod; 12. Horizontal detection rod; 13. Conductive strip; 14. Quick connector. DETAILED DESCRIPTION

[0023] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0024] The first implementation method: Figure 1-10 FIG. 1 shows a high-strength composite polyurethane foam board, comprising a lower foam layer 1, a middle foam layer 2 is arranged on the upper side of the lower foam layer 1, an upper foam layer 3 is arranged on the upper side of the middle foam layer 2, an upper reinforcing net 4 and a lower reinforcing net 5 are fixedly connected at the top and bottom ends of the lower foam layer 1, the middle foam layer 2 and the upper foam layer 3, a hinge point 6 is fixedly connected between the upper reinforcing net 4 and the lower reinforcing net 5 on the lower foam layer 1, the middle foam layer 2 and the upper foam layer 3, a transverse detection line 7 and a longitudinal detection line 8 are fixedly connected to the hinge point 6, the transverse detection line 7 and the longitudinal detection line 8 are arranged perpendicular to each other, and the transverse detection line 7 and the longitudinal detection line 8 are electrically connected to the hinge point 6, a plurality of carbon nanotubes 9 are fixedly connected to the lower foam layer 1, the middle foam layer 2 and the upper foam layer 3, the plurality of carbon nanotubes 9 are uniformly distributed in the lower foam layer 1, the middle foam layer 2 and the upper foam layer 3, and the plurality of carbon nanotubes 9 are vertically A foam layer 1, a middle foam layer 2 and an upper foam layer 3 are directly below, and multiple carbon nanotubes 9 all penetrate the lower foam layer 1, the middle foam layer 2 and the upper foam layer 3, the top and bottom ends of the multiple carbon nanotubes 9 are electrically connected to the hinge point 6, the top and bottom hinge points 6 are fixedly connected to the upper reinforcing net 4 and the lower reinforcing net 5 at one end away from the lower foam layer 1, the top and bottom upper reinforcing nets 4 and the lower reinforcing nets 5 are fixedly connected to the reinforcing plates 10 at one end away from each other, multiple transverse detection lines 7 and longitudinal detection lines 8 are fixedly connected to the same longitudinal detection rod 11 and transverse detection rod 12 at both ends respectively, multiple longitudinal detection rods 11 and transverse detection rods 12 are fixedly connected to the same conductive strip 13 at one end away from the transverse detection lines 7 and the longitudinal detection lines 8, multiple conductive strips 13 are fixedly connected to quick connectors 14 at both ends, and multiple quick connectors 14 are electrically connected to an external control system.

[0025] The composite polyurethane foam board is stacked by a lower foam layer 1, a middle foam layer 2 and an upper foam layer 3. The upper reinforcing mesh 4 and the lower reinforcing mesh 5 provide additional mechanical strength support at the top and bottom of each foam layer. The carbon nanotubes 9 are evenly distributed inside each foam layer and are perpendicular to the surface of the foam layer. The carbon nanotubes 9 enhance the overall strength and toughness of the foam board due to their excellent mechanical properties and conductivity, and construct an effective charge transfer channel to achieve self-repairing function. The foam board is embedded with polyurethane segments containing reversible chemical bonds. When the material is damaged, the chemical bonds in these segments can be broken and reconnected to achieve self-repairing. The surface of the carbon nanotubes 9 is modified with catalytically active functional groups, which can accelerate the dynamic chemical bond recombination between the polyurethane segments when damage occurs, thereby promoting the self-repair process of the material, intelligent detection and control, and the hinge point 6 serves as an electrical connection node to connect the carbon nanotubes 9, The transverse detection line 7, the longitudinal detection line 8 and the external control system are interconnected. When the foam board is subjected to stress or damage, resulting in changes in the internal structure, the conductivity of the longitudinal detection rod 11, the transverse detection rod 12 and the carbon nanotube 9 is detected one by one through the external system. The electrical signal conducted by the carbon nanotube 9 will be transmitted to the detection line through the hinge point 6, and further transmitted to the longitudinal detection rod 11 and the transverse detection rod 12. The conductive strip 13 ensures the stability and sealing of the detection system, and the quick connector 14 is responsible for quickly and accurately transmitting the detection signal to the external control system, so as to monitor the status and health of the foam board in real time, and start the self-repair process as needed. The high-strength composite polyurethane foam board combines carbon nanotube 9 reinforcement, self-repairing polymer and intelligent monitoring system to achieve functions such as material strength improvement, damage self-healing and real-time status monitoring, and is suitable for high-demand application scenarios.

[0026] Enhanced mechanical properties. By evenly distributing carbon nanotubes 9 inside the foam board, the overall strength and toughness of the material are improved. Due to its high strength, high modulus and excellent dispersibility, carbon nanotubes 9 can effectively transfer stress and disperse loads, so that the foam board has good compression, tensile and impact resistance. It has self-repairing ability. The foam layer is composed of polyurethane segments containing reversible chemical bonds such as hydrogen bonds or dynamic covalent bonds. When the material is damaged, these chemical bonds can be broken and reformed to achieve self-repair. The catalytically active functional groups modified on the surface of carbon nanotubes 9 help to accelerate the chemical reaction between polyurethane segments, thereby improving the self-repair rate and efficiency. Intelligent monitoring and feedback mechanism. The horizontal detection line 7 and the vertical detection line 8 cooperate with the hinge point 6 to construct a sensor network that can monitor the stress state and structural integrity of each part of the foam board in real time. When the foam board is deformed or damaged, the electrical signal will pass through the carbon nanotubes 9 is transmitted to the detection system, and the signal is transmitted to the external control system through the quick connector 14, so as to realize the accurate identification and positioning of the damaged position, and the efficient energy transmission and conductive performance. The multiple carbon nanotubes 9 vertically penetrating the lower foam layer 1, the middle foam layer 2 and the upper foam layer 3 form a continuous conductive network, which not only provides energy support for the self-repair process, but also optimizes the electromagnetic shielding performance and thermal conductivity of the overall material. The upper reinforcing mesh 4 and the lower reinforcing mesh 5 as well as the top and bottom reinforcing plates 10 enhance the overall stiffness and stability of the foam board, and reduce the risk of deformation or damage due to long-term use or extreme environmental conditions. Due to the self-repair ability and real-time monitoring function, the composite polyurethane foam board can automatically restore to its original state when it suffers minor damage, which reduces the maintenance frequency and cost, prolongs the service life of the product, and realizes the improvement of multi-dimensional performance, which is suitable for high-performance application requirements in various harsh environments.

[0027] The second implementation method: Figure 1-10 As shown, the lower foam layer 1 , the middle foam layer 2 and the upper foam layer 3 all include a matrix composed of polyurethane segments connected by reversible chemical bonds such as hydrogen bonds and dynamic covalent bonds.

[0028] The surface of carbon nanotube 9 is modified with catalytically active functional groups, which can participate in and accelerate the self-repair reaction between polyurethane chain segments when damaged.

[0029] Electroactive molecules are embedded in the matrix, and can be activated by externally applied current or voltage to promote the self-repair process.

[0030] The catalytically active functional groups are specifically metal ions, metal complexes or other active components that can catalyze the reorganization of dynamic chemical bonds between polyurethane chain segments.

[0031] The electroactive molecules are conductive polymers, ionic liquids or compounds containing reversible cross-linking functions.

[0032] The carbon nanotubes 9 form a good interface bond with the polyurethane matrix through a specific surface modification method, and form a continuous conductive network inside the material.

[0033] The following steps are involved: S1. Synthesizing a polyurethane prepolymer containing a reversible chemical bond; S2. Modifying catalytically active functional groups on the surface of carbon nanotubes 9; S3. Electroactive molecule formulation; S4. The modified carbon nanotubes 9 are fully mixed with the polyurethane prepolymer, and a blowing agent, a catalyst and other additives are added to form a uniform foaming system; S5 molding and curing, the mixed foaming system is injected into the mold to ensure that the carbon nanotubes 9 are vertically and evenly distributed inside the foam; S6. After the lower foam layer is initially cured, the lower reinforcement net 5 is accurately pasted and fixed on the top and bottom, and the hinge point 6 is embedded in the corresponding position, and the horizontal detection line 7 and the longitudinal detection line 8 are connected to ensure that the two are perpendicular to each other and achieve electrical contact; S7. Electrically connect, accurately fix both ends of all horizontal detection lines 7 and vertical detection lines 8 on the vertical detection rod 11 and the horizontal detection rod 12 respectively, and ensure that these detection components are closely connected through the conductive strip 13 to form a complete internal monitoring network, and install the quick connector 14.

[0034] Pretreatment stage, S1. First, synthesize polyurethane prepolymers containing reversible chemical bonds such as hydrogen bonds and dynamic covalent bonds through chemical reactions. These segments can reconnect after the material is damaged to achieve self-repair function. S2. Modify the surface of carbon nanotubes 9 and modify catalytic active functional groups, such as metal ions, metal complexes or other active components that have the ability to catalyze the reorganization of dynamic chemical bonds between polyurethane segments. These functional groups can accelerate the self-repair reaction when the foam board is damaged. Foaming system preparation stage, S3. Prepare electroactive molecules, such as conductive polymers, ionic liquids or compounds with reversible cross-linking functions. They can be activated and promote the self-repair process under the action of external current or voltage. S4. Fully mix the modified carbon nanotubes 9 with the synthesized polyurethane prepolymer, and add appropriate amounts of foaming agents, catalysts and other additives to form a uniform foaming system with good fluidity. Molding and curing stage, S5. Inject the mixed foaming system into the mold at a suitable temperature and pressure. Under the conditions, a chemical foaming reaction is carried out. During this process, it is ensured that the carbon nanotubes 9 are vertically and evenly distributed inside the foam to achieve the best reinforcement effect and good electrical conductivity. In the stage of structural integration and monitoring network construction, S6, after the lower foam layer is initially solidified, the lower reinforcing mesh 5 is accurately pasted and fixed on its top and bottom, and the effective connection between the upper reinforcing mesh 4 and the lower reinforcing mesh 5 is achieved through the hinge point 6, and the transverse detection line 7 and the longitudinal detection line 8 are installed to ensure that the two are perpendicular to each other and have good electrical contact, so as to monitor the state changes of various parts of the foam board. S7, further improve the internal monitoring network, accurately fix the two ends of all the transverse detection lines 7 and the longitudinal detection lines 8 on the longitudinal detection rod 11 and the transverse detection rod 12 respectively, and ensure the stability and sealing of the entire detection system through the conductive strip 13. Finally, install the quick connector 14 so that the detection component can achieve fast and reliable electrical connection with the external control system, and can respond quickly when the material is damaged and restore its original performance by activating the self-repair mechanism.

[0035] Excellent mechanical properties and self-repairing ability. The foam board is composed of a lower foam layer 1, a middle foam layer 2 and an upper foam layer 3. Each layer contains polyurethane segments connected by reversible chemical bonds, so that the material can self-repair by breaking and reforming chemical bonds after being damaged. The catalytically active functional groups modified on the surface of carbon nanotubes 9, such as metal ions and metal complexes, accelerate the dynamic chemical bond recombination between polyurethane segments and improve the self-repairing reaction rate and efficiency. The intelligent monitoring and feedback system is constructed by setting horizontal detection lines 7 and vertical detection lines 8 inside the foam board, as well as the hinge points 6, vertical detection rods 11, horizontal detection rods 12 and conductive strips 13 connected thereto, to construct an intelligent network for real-time monitoring of the structural integrity and stress state of the foam board. When the foam board is damaged, the system can quickly identify and transmit signals to the external control system to trigger the self-repairing process. High-efficiency energy transmission The carbon nanotubes 9 form a good interface bond with the polyurethane matrix through a specific surface modification method, and form a continuous conductive network inside the material, which not only helps to activate the electroactive molecules in the self-repair process, but also improves the electromagnetic shielding, thermal conductivity and antistatic properties of the material, and enhances the structural stability and durability. The introduction of the upper reinforcing mesh 4 and the lower reinforcing mesh 5, as well as the top and bottom reinforcing plates 10, enhances the structural stability of the entire foam board, effectively resists external forces, and reduces deformation or damage that may occur under long-term use or extreme conditions. Due to its self-repair ability and intelligent monitoring function, the foam board can automatically restore to its original state when slightly damaged, reducing the number and cost of repairs, greatly improving the service life of the product and user satisfaction, achieving a high degree of material performance improvement, and meeting the needs of high-performance application fields for lightweight, intelligent, and long-life materials.

[0036] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A high-strength composite polyurethane foam board, characterized in that: The invention comprises a lower foam layer (1), a middle foam layer (2) is arranged on the upper side of the lower foam layer (1), an upper foam layer (3) is arranged on the upper side of the middle foam layer (2), the top and bottom ends of the lower foam layer (1), the middle foam layer (2) and the upper foam layer (3) are all fixedly connected with an upper reinforcing net (4) and a lower reinforcing net (5), and hinge points (6) are fixedly connected between the upper reinforcing net (4) and the lower reinforcing net (5) on the lower foam layer (1), the middle foam layer (2) and the upper foam layer (3), and the hinge points (6) are fixedly connected to the upper reinforcing net (4) and the lower reinforcing net (5) on the hinge points (6). There are transverse detection lines (7) and longitudinal detection lines (8), the transverse detection lines (7) and longitudinal detection lines (8) are arranged perpendicular to each other, the transverse detection lines (7) and longitudinal detection lines (8) are electrically connected to the hinge point (6), the lower foam layer (1), the middle foam layer (2) and the upper foam layer (3) are fixedly connected with a plurality of carbon nanotubes (9), the plurality of carbon nanotubes (9) are evenly distributed in the lower foam layer (1), the middle foam layer (2) and the upper foam layer (3), and the plurality of carbon nanotubes (9) are perpendicular to each other. A lower foam layer (1), a middle foam layer (2) and an upper foam layer (3), and a plurality of carbon nanotubes (9) penetrate the lower foam layer (1), the middle foam layer (2) and the upper foam layer (3), the top and bottom ends of the plurality of carbon nanotubes (9) are electrically connected to the hinge point (6), the top and bottom ends of the hinge point (6) away from the lower foam layer (1) are fixedly connected to the upper reinforcing net (4) and the lower reinforcing net (5), and the top and bottom ends of the upper reinforcing net (4) and the lower reinforcing net (5) away from each other are fixedly connected to the hinge point (6) at the top and bottom ends. A reinforcing plate (10) is connected, and both ends of the plurality of transverse detection lines (7) and longitudinal detection lines (8) are respectively fixedly connected to the same longitudinal detection rod (11) and transverse detection rod (12), and one end of the plurality of longitudinal detection rods (11) and transverse detection rods (12) away from the transverse detection lines (7) and longitudinal detection lines (8) is fixedly connected to the same conductive strip (13), and both ends of the plurality of conductive strips (13) are fixedly connected to quick connectors (14), and the plurality of quick connectors (14) are electrically connected to an external control system.

2. A high-strength composite polyurethane foam board according to claim 1, characterized in that: The lower foam layer (1), the middle foam layer (2) and the upper foam layer (3) all comprise a matrix composed of polyurethane chain segments connected by reversible chemical bonds (such as hydrogen bonds, dynamic covalent bonds).

3. A high-strength composite polyurethane foam board according to claim 1, characterized in that: The surface of the carbon nanotube (9) is modified with catalytically active functional groups, and the catalytically active functional groups can participate in and accelerate the self-repair reaction between polyurethane chain segments when damaged.

4. A high-strength composite polyurethane foam board according to claim 2, characterized in that: The matrix is ​​embedded with electroactive molecules, which can be activated under the action of externally applied current or voltage to promote the self-repair process.

5. The high-strength composite polyurethane foam board according to claim 3, characterized in that: The catalytically active functional groups are specifically metal ions, metal complexes or other active components that can catalyze the reorganization of dynamic chemical bonds between polyurethane chain segments.

6. A high-strength composite polyurethane foam board according to claim 4, characterized in that: The electroactive molecules are conductive polymers, ionic liquids or compounds containing reversible cross-linking functions.

7. The high-strength composite polyurethane foam board according to claim 1, characterized in that: The carbon nanotubes (9) form a good interface bond with the polyurethane matrix through a specific surface modification method, and form a continuous conductive network inside the material.

8. A high-strength composite polyurethane foam board according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Synthesizing a polyurethane prepolymer containing a reversible chemical bond; S2. Modifying catalytically active functional groups on the surface of carbon nanotubes (9); S3. Electroactive molecule formulation; S4. The modified carbon nanotubes (9) are fully mixed with the polyurethane prepolymer, and a foaming agent, a catalyst and other additives are added to form a uniform foaming system; S5. Molding and curing, injecting the mixed foaming system into the mold to ensure that the carbon nanotubes (9) are vertically and evenly distributed inside the foam; S6. After the lower foam layer is initially cured, the lower reinforcement net (5) is accurately pasted and fixed on the top and bottom of the lower foam layer, and the hinge point (6) is embedded in the corresponding position, and the horizontal detection line (7) and the longitudinal detection line (8) are connected to ensure that the two are perpendicular to each other and achieve electrical contact; S7. Electrical connection: accurately fix both ends of all transverse detection lines (7) and longitudinal detection lines (8) on the longitudinal detection rod (11) and transverse detection rod (12), respectively, and ensure that these detection components are closely connected through the conductive strip (13) to form a complete internal monitoring network, and install the quick connector (14).

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