Polyurethane building material sandwich panel with metal face

Abstract

The utility model discloses a kind of polyurethane building material sandwich panels with metal surface, including upper metal panel, lower metal panel and the polyurethane foam heat preservation core layer between the two, the upper metal panel, lower metal panel relative side inner surface are all preset with foaming groove, equal-distance distribution's anchoring groove is opened on the foaming groove inner wall, the inner surface of the upper metal panel and lower metal panel all have multiple spaced distribution's protruding structure towards the polyurethane foam heat preservation core layer.In the utility model, the grid reinforcing rib woven by PE rope and dacron rope in embedded reinforcing structure cooperates with bearing plate to form space truss, and the bending stiffness is improved, the protruding structure and anchoring groove form three-dimensional anchoring system, polyurethane foaming is coated protruding and infiltrates anchoring groove, so that peel strength is improved, protruding height is limited to 25%-40% of core layer thickness, interface bonding force and core layer overall thermal insulation performance are considered, accurate positioning, improve construction efficiency, improve air tightness.

Description

Technical Field

[0001] This utility model relates to the field of sandwich panel technology, and in particular to a polyurethane building material sandwich panel with a metal surface. Background Technology

[0002] Polyurethane sandwich panels are polyurethane insulated sandwich panels used in construction, also known as waterproof sandwich roof panels, rigid polyurethane foam insulation boards, polyurethane composite boards, PU boards, etc. Polyurethane sandwich panels are aesthetically pleasing and offer excellent overall performance. They integrate load-bearing, thermal insulation, fire resistance, and waterproofing, requiring no secondary finishing. Installation is quick and convenient, with a short construction period and good overall benefits. They offer excellent cost-effectiveness and are a widely used, highly promising, and efficient energy-saving building envelope material. They are also a new type of energy-saving building material advocated and promoted by the Ministry of Construction.

[0003] Traditional polyurethane sandwich panels are typically made by directly bonding a metal panel to a polyurethane foam core, which has the following drawbacks: Insufficient interfacial bonding: The difference in thermal expansion coefficients between metal and polyurethane can easily lead to interfacial peeling, resulting in delamination problems after long-term use. Low structural strength: The core layer is mostly pure polyurethane foam, which has poor compressive and shear resistance and cannot meet the load-bearing requirements of large-span buildings; Fire resistance limitations: Ordinary polyurethane is flammable and requires the addition of flame retardants, but these are prone to migration and failure. Low installation efficiency: Panel connections rely on adhesives or simple mechanical fixation, resulting in poor sealing and shock resistance. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a polyurethane sandwich panel with a metal surface.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A polyurethane sandwich panel with a metal surface includes an upper metal panel, a lower metal panel, and a polyurethane foam insulation core layer located between the two. Foaming grooves are pre-set on the inner surfaces of opposite sides of the upper and lower metal panels, and anchoring grooves are evenly distributed on the inner walls of the foaming grooves. The inner surfaces of both the upper and lower metal panels have multiple spaced protrusions facing the polyurethane foam insulation core layer. The polyurethane foam insulation core layer fills and covers the protruding structure during the foaming process, forming a mechanically interlocking interface. The polyurethane foam insulation core layer includes an embedded reinforcement structure and a polyurethane foam filler filled within the embedded reinforcement structure. A flame retardant layer is sprayed onto the outer wall of the polyurethane foam insulation core layer. The embedded reinforcement structure includes multiple load-bearing plates distributed at equal intervals, and the load-bearing plates are connected with equally distributed grid reinforcing ribs, which are woven from PE rope and polyester rope.

[0006] The above solution features a lightweight and high-strength structure. In the embedded reinforcement structure, the mesh reinforcement ribs woven from PE rope and polyester rope work together with the load-bearing plate to form a spatial truss, which increases the bending stiffness by 30% and reduces the weight by 15%. The load-bearing plates are evenly distributed to avoid stress concentration, making it suitable for large-span roofs / walls.

[0007] Preferably, the raised structure is one or a combination of the following shapes: hemispherical, truncated cone, pyramidal, trapezoidal boss, strip rib; the height of the raised structure is 25%-40% of the total thickness of the polyurethane foam insulation core layer, and the distribution density of the raised structure on the inner surface of the metal panel is 50-100 per square meter.

[0008] The above solution can enhance mechanical interlocking. The protruding structure and the anchoring groove form a three-dimensional anchoring system. After polyurethane foaming, it covers the protrusion and penetrates into the anchoring groove, which improves the peel strength. The height of the protrusion is limited to 25%-40% of the core layer thickness, taking into account both the interfacial bonding force and the overall thermal insulation performance of the core layer.

[0009] Preferably, the anchoring groove has a depth of 100μm-200μm and a hole diameter of 200±10μm.

[0010] Preferably, the outer wall of the upper metal panel has equally spaced foam material injection ports, and the inner wall of the foam material injection ports is fitted with decorative caps.

[0011] Preferably, the upper connecting flange is formed by extending downward from the side edge of the upper metal panel, and the lower connecting flange is formed by extending upward from the side edge of the lower metal panel. The upper connecting flange and the lower connecting flange overlap or interlock to form an overlapping part.

[0012] Preferably, bolt holes are provided at the four corners of the upper metal panel and the lower metal panel, and the upper metal panel and the lower metal panel are fixedly connected by bolts.

[0013] In the above scheme, the bolt holes and lap joints are precisely positioned, improving construction efficiency, and the interlocking flange structure eliminates the cold bridge effect and improves airtightness.

[0014] The beneficial effects of this utility model are as follows: Lightweight and high-strength structure: In the embedded reinforcement structure, the mesh reinforcement ribs woven from PE rope and polyester rope work together with the load-bearing plate to form a spatial truss, which increases the bending stiffness by 30% and reduces the weight by 15%. The load-bearing plates are evenly distributed to avoid stress concentration, making it suitable for large-span roofs / walls. Enhanced mechanical interlocking: The raised structure and the anchoring groove form a three-dimensional anchoring system. After polyurethane foaming, it covers the raised structure and penetrates into the anchoring groove, which improves the peel strength. The height of the raised structure is limited to 25%-40% of the core layer thickness, taking into account both the interface bonding force and the overall thermal insulation performance of the core layer. The bolt holes and lap joints are precisely positioned, improving construction efficiency. The interlocking flange structure eliminates the cold bridge effect and improves airtightness. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of a polyurethane sandwich panel with a metal surface proposed in this utility model. Figure 2 This is a side sectional view of a polyurethane sandwich panel with a metal surface proposed in this utility model. Figure 3 This is a cross-sectional structural diagram of the polyurethane foam insulation core layer of a polyurethane building material sandwich panel with a metal surface proposed in this utility model. Figure 4 This is a schematic diagram of the mesh reinforcement structure of a polyurethane sandwich panel with a metal surface proposed in this utility model.

[0016] In the diagram: 1. Upper metal panel; 2. Lower metal panel; 3. Polyurethane foam insulation core layer; 4. Foaming material injection port; 5. Bolt hole; 6. Foaming groove; 7. Anchoring groove; 8. Raised structure; 9. Fixing bolt; 10. Load-bearing plate; 11. Mesh reinforcing rib; 12. Polyurethane foam filler; 13. PE rope; 14. Polyester rope; 15. Flame retardant layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Example 1, referring to Figure 1-4 A polyurethane building sandwich panel with a metal surface includes an upper metal panel 1, a lower metal panel 2 and a polyurethane foam insulation core layer 3 located between the two. Foaming grooves 6 are pre-set on the inner surfaces of opposite sides of the upper metal panel 1 and the lower metal panel 2. Anchoring grooves 7 are evenly distributed on the inner wall of the foaming grooves 6. The inner surfaces of both the upper metal panel 1 and the lower metal panel 2 have multiple spaced protrusions 8 facing the polyurethane foam insulation core layer 3. During the foaming process, the polyurethane foam insulation core layer 3 fills and covers the raised structure 8 to form a mechanically interlocking interface. The polyurethane foam insulation core layer 3 includes an embedded reinforcement structure and a polyurethane foam filler 12 filled within the embedded reinforcement structure. A flame retardant layer 15 is sprayed onto the outer wall of the polyurethane foam insulation core layer 3. The embedded reinforcement structure includes multiple load-bearing plates 10 distributed at equal intervals, and the load-bearing plates 10 are connected with equally distributed grid reinforcing ribs 11, which are woven from PE ropes 13 and polyester ropes 14.

[0019] It features a lightweight and high-strength structure. In the embedded reinforcement structure, the mesh reinforcement ribs 11 woven from PE rope 13 and polyester rope 14 work together with the load-bearing plate 10 to form a spatial truss, which increases the bending stiffness by 30% and reduces the weight by 15%. The load-bearing plates are evenly distributed to avoid stress concentration, making it suitable for large-span roofs / walls.

[0020] The raised structure 8 is one of the following shapes or a combination thereof: hemispherical, truncated cone, pyramidal, trapezoidal boss, strip rib; the height of the raised structure 8 is 25%-40% of the total thickness of the polyurethane foam insulation core layer 3, and the distribution density of the raised structure 8 on the inner surface of the metal panel is 50-100 per square meter.

[0021] It can strengthen mechanical interlocking. The protruding structure 8 and the anchoring groove 7 form a three-dimensional anchoring system. After polyurethane foaming, it covers the protrusion and penetrates into the anchoring groove 7, which improves the peel strength. The height of the protrusion is limited to 25%-40% of the core layer thickness, taking into account both the interface bonding force and the overall thermal insulation performance of the core layer.

[0022] The anchoring groove 7 has a depth of 100μm-200μm and a hole diameter of 200±10μm.

[0023] The outer wall of the upper metal panel 1 has foam material injection ports 4 that are evenly distributed, and the inner wall of the foam material injection ports 4 is fitted with a decorative cover.

[0024] The upper connecting flange is formed by extending downward from the side edge of the upper metal panel 1, and the lower connecting flange is formed by extending upward from the side edge of the lower metal panel 2. The upper connecting flange and the lower connecting flange overlap or interlock to form a joint.

[0025] Bolt holes 5 are provided at the four corners of the upper metal panel 1 and the lower metal panel 2, and the upper metal panel 1 and the lower metal panel 2 are fixedly connected by bolts 9.

[0026] Bolt hole 5 and the lap joint are precisely positioned to improve construction efficiency, and the interlocking flange structure eliminates the cold bridge effect and improves air tightness.

[0027] Working principle: Flame retardant coating: Flame retardant layer 15 is sprayed onto the inner surfaces of the upper metal panel 1 and the lower metal panel 2 to form a flame retardant coating. Metal panel bonding stage: The embedded reinforcement structure is implanted into the lower metal panel 2 and temporarily fixed with adhesive. Then, the upper and lower flanges of the upper metal panel 1 and the lower metal panel 2 are interlocked, and sealant is squeezed at the joint to seal it.

[0028] Foaming stage: The polyurethane prepolymer is injected between the upper metal panel 1 and the lower metal panel 2 through the injection port 4. When it expands during foaming, it fills all the protruding structures 8 and the anchoring grooves 7 to form the polyurethane foam insulation core layer 3. After curing, it forms a "barb-groove" mechanical interlock. The micron-level anchoring grooves 7 enhance resin penetration through capillary action to achieve nanoscale bonding. At this time, the flame retardant layer 15 is tightly bonded to the outer wall of the polyurethane foam insulation core layer 3. When exposed to fire, the flame retardant layer 15 expands rapidly to form a carbonized heat insulation layer, which slows down heat conduction. Sealing installation process: The decorative cover seals the injection port 4, and sealant is injected to ensure a smooth appearance and prevent leakage.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A polyurethane sandwich panel with a metal surface, comprising an upper metal panel (1), a lower metal panel (2), and a polyurethane foam insulation core layer (3) located between the two, characterized in that, The upper metal panel (1) and the lower metal panel (2) are both provided with foaming grooves (6) on their opposite inner surfaces, and the foaming grooves (6) are provided with equally spaced anchoring grooves (7) on their inner walls. The inner surfaces of the upper metal panel (1) and the lower metal panel (2) each have a plurality of spaced protrusions (8) facing the polyurethane foam insulation core layer (3). The polyurethane foam insulation core layer (3) fills and covers the protruding structure (8) during the foaming process to form a mechanical interlocking interface; The polyurethane foam insulation core layer (3) includes an embedded reinforcement structure and a polyurethane foam filler (12) filled in the embedded reinforcement structure. A flame retardant layer (15) is sprayed on the outer wall of the polyurethane foam insulation core layer (3). The embedded reinforcement structure includes multiple load-bearing plates (10) distributed at equal intervals, and the load-bearing plates (10) are connected with equally distributed grid reinforcing ribs (11), which are woven from PE rope (13) and polyester rope (14).

2. The polyurethane sandwich panel with a metal surface according to claim 1, characterized in that, The raised structure (8) is one of the following shapes or a combination thereof: hemispherical, truncated cone, pyramidal, trapezoidal boss, strip rib; the height of the raised structure (8) is 25%-40% of the total thickness of the polyurethane foam insulation core layer (3), and the distribution density of the raised structure (8) on the inner surface of the metal panel is 50-100 per square meter.

3. A polyurethane sandwich panel with a metallic surface according to claim 1, characterized in that, The anchoring groove (7) has a depth of 100μm-200μm and a hole diameter of 200±10μm.

4. A polyurethane sandwich panel with a metallic surface according to claim 1, characterized in that, The outer wall of the upper metal panel (1) is provided with foam material injection ports (4) that are evenly distributed, and the inner wall of the foam material injection port (4) is fitted with a decorative cover.

5. A polyurethane sandwich panel with a metallic surface according to claim 1, characterized in that, The upper connecting flange is formed by extending downward from the side edge of the upper metal panel (1), and the lower connecting flange is formed by extending upward from the side edge of the lower metal panel (2). The upper connecting flange and the lower connecting flange overlap or interlock to form an overlapping part.

6. A polyurethane sandwich panel with a metallic surface according to claim 1, characterized in that, Bolt holes (5) are provided at the four corners of the upper metal panel (1) and the lower metal panel (2), and the upper metal panel (1) and the lower metal panel (2) are fixedly connected by bolts (9).

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