Metal-polymer composite structure and processing technology

Abstract

The invention relates to the technical field of metal polymer materials, in particular to a metal-polymer composite structure and a processing technology, the structure comprises a link structure constructed on the metal surface, the surface of the link structure is used for performing high-temperature pressing treatment with a molten polymer material, and the link structure is a female thorn structure or a male thorn structure or an interpenetrating structure; the contact area and the mechanical occlusal force between metal and a high polymer material are increased by constructing a specific linking structure, such as a negative thorn, a positive thorn or an interpenetrating structure, on the surface of the metal. In the high-temperature pressing process, a molten high polymer material can fully permeate into the structures to form a stable bonding interface of'mini-size our-our '; the invention solves the technical problems of environmental pollution, health damage, insufficient heat resistance and obvious attenuation of interfacial strength in a humid and hot environment, which are caused by adopting an adhesive means during compounding of metal macromolecules in the prior art.

Description

Technical Field

[0001] This invention relates to the field of metal polymer materials technology, specifically to a metal-polymer composite structure and its processing technology. Background Technology

[0002] In the field of modern materials science and engineering, the performance of materials directly determines the service level and application range of various components. Metallic materials and polymeric materials, as two crucial material systems, each occupy an irreplaceable position in different fields due to their unique advantages. Metallic materials, whether steel, aluminum alloys, or titanium alloys, possess outstanding high strength, which is reflected not only in their compressive and tensile strength under static loads but also in their impact resistance and fatigue resistance under dynamic conditions. Polymeric materials, on the other hand, are characterized by their lightweight nature; their density is typically much lower than that of metallic materials. This significant density difference gives polymeric materials a natural advantage in applications requiring lightweight construction. Based on the two core advantages of high strength in metallic materials and lightweight in polymeric materials, effectively combining these two types of materials to construct metal-polymer composite components has become a key approach to solving the challenge of achieving both high strength and lightweight in many engineering fields.

[0003] Metallic materials typically possess high surface energy, good electrical and thermal conductivity, and their surfaces often exhibit polar characteristics. In contrast, most polymeric materials are organic compounds with lower surface energy, poorer electrical and thermal conductivity, fewer polar groups in their molecular structure, and some are even non-polar. This significant difference in surface properties and structure makes it difficult to form a strong bond at the interface during the composite process of metals and polymers, resulting in insufficient interfacial bonding strength. Insufficient interfacial bonding strength can trigger a series of serious problems. When the component is subjected to external forces, the interface easily becomes a weak point, initially exhibiting damage such as cracks and peeling. With continued external force or prolonged use, this damage will continue to expand, ultimately leading to the failure of the entire composite component and rendering it unusable.

[0004] Therefore, improving the bonding strength of the metal-polymer composite interface is a key prerequisite for ensuring the reliability of connectors during service and is also one of the key research directions in the field of materials science and engineering. Researchers have conducted extensive research on this issue, using various methods to improve the interfacial compatibility of metals and polymers and increase the interfacial bonding strength. Current technologies mainly rely on adhesive bonding. For example, patent application CN107379675A discloses a novel composite metal sheet, which includes a first composite metal layer, a second adhesive layer, and a third composite inner layer. The first composite metal layer is composed of chromium, boron, titanium, and cobalt, and the third composite inner layer is composed of ceramic matrix composite material and polymer material. The first composite metal layer and the third composite inner layer are fixedly bonded by the second adhesive layer. Another example is patent application CN2804541Y, which discloses a composite pipe composed of a corrugated metal pipe and a polymer material. It has a metal pipe and a polymer material layer. The metal pipe is corrugated, and there are polymer material layers on the inner and outer sides of the metal pipe. An adhesive layer is placed between the metal pipe and the polymer material layer. The metal tube has spiral or circumferential corrugations.

[0005] In both of the above methods, the bonding between the metal and the polymer is achieved using adhesives. However, adhesive technology has inherent drawbacks: Firstly, the production and curing process of adhesives continuously releases volatile organic compounds such as formaldehyde and toluene. These harmful substances not only cause serious pollution to the surrounding environment and disrupt the ecological balance, but also pose a significant threat to the health of operators. Long-term exposure may lead to respiratory diseases, nervous system damage, and other health problems. Secondly, the heat resistance of adhesives is severely insufficient, typically with a heat resistance temperature below 150℃. In high-temperature environments, adhesives are prone to softening and failure, resulting in a significant decrease in the interfacial bonding strength between the metal and the polymer material. Simultaneously, in humid and hot environments, the performance of adhesives deteriorates rapidly after absorbing moisture, significantly reducing interfacial strength and consequently affecting the service reliability and lifespan of the entire composite component. Summary of the Invention

[0006] This invention provides a metal-polymer composite structure to solve the technical problems of environmental pollution and health damage, insufficient heat resistance, and significant attenuation of interfacial strength in humid and hot environments caused by the use of adhesives in the metal-polymer composite process in the prior art. The purpose of this invention is also to provide a processing technology for the metal-polymer composite structure.

[0007] To solve the above problems, the metal-polymer composite structure provided by the present invention adopts the following technical solution: A metal-polymer composite structure includes a linking structure built on the surface of a metal, the surface of which is used for high-temperature pressing with a molten polymer material, wherein the linking structure is a barbed structure, a barbed structure, or an interpenetrating structure.

[0008] The beneficial effects of the above scheme are as follows: by constructing specific linking structures on the metal surface, such as anterior, posterior, or interpenetrating structures, the contact area and mechanical interlocking force between the metal and the polymer material are increased. During high-temperature pressing, the molten polymer material can fully penetrate into these structures, forming a stable interlocking interface. This structural bonding method results in an interfacial bonding force far exceeding the intermolecular bonding force of the polymer material itself, and significantly stronger than the bonding force achievable by traditional adhesives or simple physical anchoring. Since the bonding structure is provided by the metal substrate itself, it maintains stability even at high temperatures, overcoming the defect of traditional adhesives being prone to failure at high temperatures. Simultaneously, this method completely eliminates the use of adhesives, fundamentally eliminating the risk of harmful solvent volatilization and improving the safety and environmental friendliness of the production and use processes. Through the above-described configuration, this invention provides a novel method for combining metals and polymers, solving the technical problems of environmental pollution and health damage, insufficient heat resistance, and significant attenuation of interface strength under humid and hot conditions caused by the use of adhesives in the prior art when combining metals and polymers.

[0009] Furthermore, the puncture structure is a groove formed on the metal surface, and the groove is used to press and molten polymer material.

[0010] The beneficial effects of the above scheme are: during the high-temperature pressing process, the molten polymer material can more easily penetrate into the groove and form a sufficient mechanical interlock. This penetration helps to improve the interfacial bonding strength and durability.

[0011] Furthermore, the protruding structure is a protrusion formed on the metal surface, and the surface of the protrusion is used to press and molten polymer material.

[0012] The beneficial effects of the above scheme are: the protruding structure increases the mechanical interlocking points between the polymer material and the metal by forming protrusions on the metal surface. During the high-temperature pressing process, the molten polymer material can wrap around and penetrate the protrusions to form a stable bonding interface, thereby improving the interfacial bonding strength. The protrusion design increases the actual contact area between the metal and the polymer material. At the same time, more contact points mean that stress can be more evenly distributed when subjected to force, reducing the risk of failure caused by local stress concentration.

[0013] Furthermore, the interpenetrating structure is a double-layer mesh plate formed on the metal surface, and the mesh surface of the double-layer mesh plate is used to inject molten polymer material.

[0014] Furthermore, the two mesh layers of the double-layer mesh plate are staggered by half a grid to increase the adhesion area of ​​the molten polymer material.

[0015] The beneficial effects of the above scheme are as follows: the double-layer mesh structure, by forming two staggered meshes on the metal surface, greatly increases the contact area between the metal and the polymer material. This design allows the molten polymer material to fully penetrate into the mesh gaps, forming a stable mechanical interlock, thereby improving the interfacial bonding strength. This structural bonding method is far superior to the intermolecular bonding force of the polymer material itself, and is also significantly stronger than the bonding force achievable by traditional adhesives or simple physical anchoring.

[0016] Furthermore, the puncture structure, spiky structure, or interpenetrating structure is formed by machining or 3D printing.

[0017] The beneficial effects of the metal-polymer composite structure provided by this invention are as follows: In the anterior-fiber structure, the molten polymer material can more easily penetrate into the groove, forming a sufficient mechanical interlock; the posterior-fiber structure allows the molten polymer material to wrap around and penetrate the protrusions, forming a stable bonding interface, thereby improving the interfacial bonding strength; the double-layer mesh plate structure allows the molten polymer material to fully penetrate into the mesh gaps, forming a stable mechanical interlock, thereby improving the interfacial bonding strength. All three methods are designed to address the shortcomings of traditional adhesive structures, significantly improving the bonding force between the metal and polymer structures, and solving the technical problems of environmental pollution and health damage, insufficient heat resistance, and significant interface strength attenuation under humid and hot environments caused by the use of adhesives in metal-polymer composites in existing technologies.

[0018] To solve the above problems, the processing technology of the metal-polymer composite structure provided by the present invention adopts the following technical solution: A processing method for forming a metal-polymer composite structure, the process comprising the following steps: S1: Construct a metal surface bonding structure; S2: Metal degreasing: Remove grease and dirt from the metal surface after the link structure is formed in step S1; S3: Metal rinsing and drying: Rinse and dry the degreased metal material from step S2; S4: Metal preheating: The metal material obtained in step S3 is preheated at high temperature in preparation for composite with polymer materials. S5: Melting of polymer materials: The polymer materials are dried and then heated and melted through a polymer sheet and rod extruder to reach a molten state; S6: High-temperature pressing: The preheated metal material in step S4, which has been machined or 3D printed, is pressed with the polymer material in step S5 at high temperature to form a composite material. S7: Cooling and molding: Cool the composite material obtained in step S6 to room temperature to achieve the bonding of polymer materials and metals.

[0019] The beneficial effects of the above scheme are as follows: by constructing specific linking structures on the metal surface, such as anterior, posterior, or interpenetrating structures, the contact area and mechanical interlocking force between the metal and the polymer material are increased. During high-temperature pressing, the molten polymer material can fully penetrate into these structures, forming a stable interlocking interface. This structural bonding method results in an interfacial bonding force far exceeding the intermolecular bonding force of the polymer material itself, and significantly stronger than the bonding force achievable by traditional adhesives or simple physical anchoring. Since the bonding structure is provided by the metal substrate itself, it maintains stability even at high temperatures, overcoming the defect of traditional adhesives being prone to failure at high temperatures. Simultaneously, this method completely eliminates the use of adhesives, fundamentally eliminating the risk of harmful solvent volatilization and improving the safety and environmental friendliness of the production and use processes. Through the above-described configuration, this invention provides a novel method for combining metals and polymers, solving the technical problems of environmental pollution and health damage, insufficient heat resistance, and significant attenuation of interface strength under humid and hot conditions caused by the use of adhesives in the prior art when combining metals and polymers.

[0020] Furthermore, the link structure can be constructed through machining or 3D printing.

[0021] Furthermore, in step S2, grease and dirt are removed by brushing and cleaning agent.

[0022] Furthermore, the polymer material is a castable polymer material or a thermoplastic polymer material, and the metal material is steel, zinc, or aluminum alloy.

[0023] Furthermore, the cleaning agent includes an alkaline cleaning agent, and the degreasing process is carried out at a temperature of room temperature to 100°C for a time of 1-10 minutes; Furthermore, in step S3, the rinsing temperature is room temperature to 50°C, and the time is 0.5-10 min; Furthermore, in step S4, the preheating temperature of the metal material is 200-400℃, and the time is 1-3 hours; Furthermore, in step S6, the high-temperature pressing temperature is 200-400℃, the pressure is 5-30MPa, and the holding time is 2-10h; Furthermore, in step S7, the cooling method is either natural cooling at room temperature or slow cooling with insulation.

[0024] The beneficial effects of the processing technology for the metal-polymer composite structure provided by this invention are as follows: In the anterior-punched structure, the molten polymer material can more easily penetrate into the groove, forming a sufficient mechanical interlock; the posterior-punched structure allows the molten polymer material to wrap around and penetrate the protrusions, forming a stable bonding interface, thereby improving the interfacial bonding strength; the double-layer mesh plate structure allows the molten polymer material to fully penetrate into the mesh gaps, forming a stable mechanical interlock, thereby improving the interfacial bonding strength. All three methods are designed to address the shortcomings of traditional adhesive structures, significantly improving the bonding force between the metal and polymer structures, and solving the technical problems of environmental pollution and health damage, insufficient heat resistance, and significant interface strength attenuation under humid and hot environments caused by the use of adhesives in metal-polymer composites in existing technologies. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the metal material with a barbed structure in this invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the metal material with a serrated structure in this invention; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the metal material with an interpenetrating structure in this invention; Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 This is a schematic diagram of the metal-polymer composite structure with interpenetrating structure in this invention; Figure 8 for Figure 7 Enlarged view of point D in the middle; Figure 9 This is a flowchart illustrating the processing technology of the metal-polymer composite structure provided by the present invention.

[0026] Explanation of reference numerals in the attached figures: 1. Metallic material; 2. Groove; 3. Protruding column; 4. Double-layer mesh plate; 41. Mesh; 5. Polymer material. Detailed Implementation

[0027] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0028] It should be noted that this application improves upon the shortcomings of existing adhesive methods used in metal-polymer composites. These adhesive methods continuously release volatile organic compounds such as formaldehyde and toluene during production and curing. These harmful substances diffuse freely into the surrounding environment, causing serious pollution and disrupting the ecological balance. Simultaneously, the heat resistance of adhesive methods is severely insufficient, typically below 150℃. In high-temperature environments, the adhesive softens rapidly or even fails, leading to a significant decrease in the interfacial bonding strength between the metal and polymer materials. This makes the composite components highly susceptible to separation and detachment, failing to meet the requirements for use under high-temperature conditions. Furthermore, in humid and hot environments, the adhesive's performance deteriorates rapidly after absorbing moisture, significantly reducing interfacial strength and severely impacting the reliability and service life of the composite components. Finally, the interfacial bonding force formed by adhesive methods is relatively weak. Compared to mechanical interlocking joints achieved through specific linking structures, the bonding interface formed by adhesives is more prone to becoming a weak point under external forces, resulting in cracks, peeling, and other damage. With continued application of external forces or prolonged use, these damages will continue to expand, eventually leading to the failure of the entire composite component and rendering it unable to serve normally. The specific embodiments of this application will be described below.

[0029] Examples of the metal-polymer composite structure provided by this invention: like Figures 1 to 8 As shown, a metal-polymer composite structure includes a linking structure built on the metal surface. The surface of the linking structure is used for high-temperature pressing with molten polymer material 5. The linking structure has three forms: an anodized structure, an anodic structure, or an interpenetrating structure.

[0030] like Figure 1 and Figure 2 As shown, the indented structure is a groove 2 formed on the metal surface, and the groove 2 is used to press and bind the molten polymer material 5. The advantage of the indented structure is that it allows the molten polymer material 5 to fully penetrate into the groove 2 in a penetrating manner, achieving sufficient mechanical interlocking.

[0031] like Figure 2 As shown, the groove 2 is arranged at an inclined angle to further increase the penetration amount of the molten polymer material 5 and further improve the bonding strength. In other embodiments, the groove 2 can also be a vertical structure, and the designer can adjust the angle of the groove 2 according to actual needs.

[0032] like Figure 3 and Figure 4As shown, the anodized structure consists of protruding posts 3 formed on the metal surface, and the surface of the protruding posts 3 is used to press the molten polymer material 5 together. The advantage of the anodized structure is that the protruding posts 3 increase the mechanical interlocking points between the polymer material 5 and the metal, allowing the molten polymer material 5 to form a stable bonding interface on the outer peripheral surface of the protruding posts 3, and also improving the interfacial bonding strength.

[0033] Unlike the yin and yang needle structures, such as Figure 5 and Figure 6 As shown, the interpenetrating structure is a double-layer mesh plate 4 formed on the metal surface, and the mesh surface of the double-layer mesh plate 4 is used to inject molten polymer material 5.

[0034] like Figures 5 to 8 As shown, specifically, the two mesh layers 41 of the double-layer mesh plate 4 are staggered by half a grid to increase the adhesion area of ​​the molten polymer material 5. The interpenetrating structure greatly increases the contact area between the metal and the polymer material 5, resulting in a significant improvement in interfacial bonding strength. In other embodiments, the number of mesh plates can be adjusted according to actual needs, and can be three layers or other numbers.

[0035] In the actual processing, the pierced structure, the anterior pierced structure, or the interpenetrating structure are formed by machining on a machine tool or by 3D printing.

[0036] The three linking structures described above offer a variety of options, increasing the flexibility and adaptability of structural design. Different structures can accommodate different combinations of metals and polymers, as well as various application scenarios. By increasing the contact area and mechanical interlocking force, they significantly improve the interfacial bonding strength. These structures form a stable, interdependent bonding interface, resulting in an interfacial bonding force far exceeding the intermolecular bonding force of the polymer itself. Furthermore, these structures are integral to the metal substrate, thus maintaining stability at high temperatures and overcoming the shortcomings of traditional adhesives that are prone to failure at high temperatures.

[0037] The advantages of machining lie in its high precision and excellent surface quality. Through precise tool movement and CNC system control, machining can create highly precise interlocking structures on metal surfaces. For example, when machining the groove 2 of a negative-spinned structure or the protrusion 3 of a positive-spinned structure, its depth, width, and shape can be precisely controlled to ensure effective bonding with the subsequently molten polymer material 5. This high-precision machining helps to form a stable mechanical interlocking force, making the interface between the metal and the polymer material 5 more robust. In aerospace, precision instruments, and other fields, the dimensional accuracy requirements for composite structures are extremely high. Machining can meet these stringent precision requirements, ensuring the quality and performance stability of composite materials.

[0038] Simultaneously, the machining process allows for fine treatment of the metal surface, resulting in a smooth and flat surface quality. After constructing the linkage structure, the metal surface undergoes cutting and grinding processes to effectively remove surface defects and oxide layers, providing a good foundation for the composite with polymer material 5. The smooth metal surface facilitates the uniform penetration of molten polymer material 5 during high-temperature pressing, reduces defects and stress concentration at the interface, and improves the bonding strength and durability of the composite interface.

[0039] Finally, machining technology is mature and applicable to the processing of metal materials 1 of various shapes and sizes. Whether flat, cylindrical, or complex-shaped, metal components can be constructed using machining methods to create the required connection structures. Machining also has good adaptability to different types of metal materials 1; commonly used metal materials 1 such as steel, zinc, and aluminum alloys can all be machined to construct connection structures, providing flexibility for the manufacture of metal-polymer composite structures in different application scenarios.

[0040] The advantages of 3D printing lie in its high degree of design freedom, enabling the creation of interconnected structures of various complex shapes. It can easily print interpenetrating structures with complex curves, internal cavities, or special geometries. This highly customized design can better meet the specific performance requirements of metal-polymer composite structures in different application scenarios. Furthermore, 3D printing uses a layer-by-layer deposition manufacturing method, eliminating the need for traditional mold making and complex machining processes, significantly shortening the product manufacturing cycle. From design model to finished product manufacturing, it can be completed in a relatively short time, making it particularly suitable for small-batch, customized production needs. During the product development stage, it can quickly produce samples for performance testing and verification, accelerating product iteration and optimization, improving R&D efficiency, and reducing R&D costs.

[0041] In this embodiment, the polymer material 5 is a castable polymer material or a thermoplastic polymer material, and the metal material 1 is steel, zinc, or aluminum alloy.

[0042] The working principle of the metal-polymer composite structure provided by this invention is as follows: A suitable linking structure is selected for construction. Metal material 1 undergoes degreasing, rinsing and drying, and preheating treatment in sequence to prepare for compositing with polymer material 5. Then, polymer material 5 is dried and heated to a molten state using a polymer sheet / rod extruder. The preheated metal material 1 from step S4, having undergone machining or 3D printing, is then pressed together with polymer material 5 from step S5 at high temperature to form a composite material. Finally, the composite material is cooled to room temperature to achieve the bonding between polymer material 5 and the metal.

[0043] Examples of the processing technology for the metal-polymer composite structure provided by this invention: like Figure 9 As shown, the processing technology for forming the aforementioned metal-polymer composite structure includes the following steps: S1: Construct a metal surface bonding structure; S2: Metal degreasing: Remove grease and dirt from the metal surface after the link structure is formed in step S1; S3: Metal rinsing and drying: Rinse and dry the degreased metal material 1 from step S2; S4: Metal preheating: The metal material 1 obtained in step S3 is preheated at high temperature in preparation for its composite with polymer material 5. S5: Melting of polymer material 5: The polymer material 5 is dried and then heated and melted through a polymer sheet and rod extruder to reach a molten state; S6: High-temperature pressing: The preheated metal material 1 from step S4, which has been machined or 3D printed, is pressed with the polymer material 5 from step S5 at high temperature to form a composite material. S7: Cooling and molding: Cool the composite material obtained in step S6 to room temperature to achieve the bonding of polymer material 5 and metal.

[0044] Specifically, the linking structure is constructed through machining or 3D printing. By constructing an effective bonding structure on the surface of the metal material 1 through machining or 3D printing, the direct bonding between the metal and the polymer material 5 is achieved, completely eliminating the use of traditional adhesives and fundamentally eliminating the risk of volatilization of harmful solvents such as formaldehyde and toluene, thus significantly improving the safety of the production and use process.

[0045] Furthermore, the surface bonding structure is simple and easy to construct, applicable to both small-volume metal parts and large-surface-area metal components; at the same time, different types of polymer materials can be bonded to the same metal matrix surface, greatly expanding the application range of composite materials.

[0046] In step S2, grease and dirt are removed by brushing and using a cleaning agent. This is to ensure the metal surface is clean, which facilitates full contact and bonding between the polymer material 5 and the metal surface. The cleaning agent includes an alkaline cleaning agent, and the degreasing process is carried out at a temperature of room temperature to 100°C for 1-10 minutes; in other embodiments, the temperature and time can be adjusted according to actual conditions.

[0047] This allows operators to select appropriate processing parameters based on actual conditions, ensuring cleaning effectiveness without excessively damaging the metal surface. Furthermore, the use of alkaline cleaning agents is suitable for cleaning various metal materials, increasing the method's versatility. Alkaline cleaning agents are applicable to cleaning various commonly used metal materials such as steel, zinc, and aluminum alloys. Different metal materials have different chemical properties and surface characteristics, and alkaline cleaning agents can effectively remove grease and dirt from these metal surfaces without corroding or damaging the metal substrate, ensuring the stable performance of the metal material during subsequent processing. Simultaneously, in actual production, there is no need to change the cleaning agent for different metal materials, simplifying the process, reducing production costs, and improving production efficiency.

[0048] Meanwhile, in step S3, the rinsing temperature is between room temperature and 50°C, and the time is 0.5-10 minutes. The rinsing process removes residual cleaning agent from the metal surface, preventing it from affecting subsequent bonding. Furthermore, proper rinsing helps maintain the activity of the metal surface, which is beneficial for bonding with the polymer material 5. Drying ensures the surface is completely dry, effectively removing residual cleaning agent and preparing it for subsequent high-temperature treatment. In other embodiments, the rinsing temperature and time can be adjusted according to actual needs.

[0049] In step S4, the preheating temperature of metal material 1 is 200-400℃ and the time is 1-3h; in step S6, the high-temperature pressing temperature is 200-400℃, the pressure is 5-30MPa, and the holding time is 2-10h; in step S7, the cooling method is natural cooling at room temperature or slow cooling with heat preservation.

[0050] The advantages of the above design are that preheating can change the microstructure of the metal surface, increasing surface activity and facilitating bonding with the polymer material 5. Matching the preheating temperature range with the subsequent melting temperature of the polymer material 5 helps maintain a stable temperature during pressing, promoting better bonding. Finally, preheating can also reduce the temperature difference between the metal and polymer material 5 during pressing, reducing thermal stress caused by differences in thermal expansion coefficients and improving the stability of the bonding interface.

[0051] During cooling molding, controlling the cooling rate can reduce internal stress caused by rapid cooling, thereby improving the overall performance and lifespan of composite materials. For semi-crystalline polymers, slow cooling is beneficial for increasing the crystallinity of the material, thus improving its mechanical properties. Natural cooling or slow cooling with insulation can be selected based on the specific material and product requirements.

[0052] The working principle of the processing technology for the metal-polymer composite structure provided by this invention is as follows: First, specific linking structures, such as anterior-posterior, posterior-posterior, or interpenetrating structures, are constructed on the metal surface using machining or 3D printing technology to increase the contact area between the metal and the polymer material 5, and enhance the bonding force between the two through mechanical interlocking. Subsequently, the metal surface is degreased by using cleaning agents and brushing to remove grease and dirt, ensuring the cleanliness of the metal surface and providing a good foundation for subsequent bonding. Next, rinsing and drying steps further remove surface residues and enhance the activity of the metal surface. In the metal preheating stage, the treated metal material 1 is heated to an appropriate temperature. This step not only helps to improve the microstructure activity of the metal surface but also reduces the temperature difference during subsequent pressing with the polymer material 5, thereby reducing thermal stress and improving the stability of the bonding interface. Simultaneously, after drying, the polymer material 5 is heated to a molten state using a polymer sheet / rod extruder. Under high temperature and pressure conditions, the molten polymer material 5 is pressed into the pre-constructed link structure on the metal surface, fully penetrating and filling the entire structure to form a three-dimensional interpenetrating and stable bonding interface. This bonding method results in a bonding force between the polymer material 5 and the metal that far exceeds that of traditional adhesives or simple physical anchoring, and it remains stable even at high temperatures.

[0053] Finally, through a cooling and molding process, the composite material gradually solidifies, achieving a strong bond between the polymer material 5 and the metal. The entire process is safe and environmentally friendly, completely eliminating the use of traditional adhesives and removing the risk of harmful solvent volatilization at the source, thus improving the safety and environmental friendliness of the production and use processes.

[0054] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0055] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A metal-polymer composite structure, characterized in that, It includes a link structure built on a metal surface, the surface of which is used for high-temperature pressing with molten polymer material, the link structure being a barbed structure, an anodized structure, or an interpenetrating structure.

2. The metal-polymer composite structure according to claim 1, characterized in that: The puncture structure is a groove formed on the metal surface, and the groove is used to press and molten polymer material.

3. The metal-polymer composite structure according to claim 1, characterized in that: The protruding structure is a protruding post formed on the metal surface, and the surface of the protruding post is used to press and molten polymer material.

4. The metal-polymer composite structure according to claim 1, characterized in that: The interpenetrating structure is a double-layered grid plate formed on the metal surface, and the grid surface of the double-layered grid plate is used to inject molten polymer material.

5. The metal-polymer composite structure according to claim 4, characterized in that: The two mesh layers of the double-layer mesh plate are staggered by half a grid to increase the adhesion area of ​​the molten polymer material.

6. The metal-polymer composite structure according to any one of claims 1 to 5, characterized in that: The puncture structure, spur structure, or interpenetrating structure is formed by machining or 3D printing.

7. A processing method for a metal-polymer composite structure, the process being used to form the metal-polymer composite structure according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1: Construct a metal surface bonding structure; S2: Metal degreasing: Remove grease and dirt from the metal surface after the link structure is formed in step S1; S3: Metal rinsing and drying: Rinse and dry the degreased metal material from step S2; S4: Metal preheating: The metal material obtained in step S3 is preheated at high temperature in preparation for composite with polymer materials. S5: Melting of polymer materials: The polymer materials are dried and then heated and melted through a polymer sheet and rod extruder to reach a molten state; S6: High-temperature pressing: The preheated metal material in step S4, which has been machined or 3D printed, is pressed with the polymer material in step S5 at high temperature to form a composite material. S7: Cooling and molding: Cool the composite material obtained in step S6 to room temperature to achieve the bonding of polymer materials and metals.

8. The processing technology of the metal-polymer composite structure according to claim 7, characterized in that: The link structure can be constructed through machining or 3D printing.

9. The processing technology of the metal-polymer composite structure according to claim 7, characterized in that: In step S2, grease and dirt are removed by brushing and cleaning agent.

10. The processing technology for the metal-polymer composite structure according to any one of claims 7 to 9, characterized in that: The polymer material is a castable polymer material or a thermoplastic polymer material, and the metal material is steel, zinc, or aluminum alloy.

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