Heat insulation type laminated iron

Abstract

The utility model discloses heat insulation type laminated iron, which comprises a metal substrate and a PET (polyethylene terephthalate) layer adhered on the surface of the metal substrate, the PET layer comprises a base layer and a conical array structure formed on the surface of the base layer, the conical array structure comprises a plurality of conical convex structures, and an Ag layer and an oxide protection layer are sequentially arranged on the side surface of each conical convex structure. According to the laminated iron, the reflectivity of the laminated iron in an infrared band can be improved, the heat insulation performance of a material is enhanced, meanwhile, the risk of migration of harmful substances is avoided, and the laminated iron has good safety.

Description

Technical Field

[0001] This utility model relates to a coated iron, belonging to the technical field of metal and resin layered products. Background Technology

[0002] Coated iron is a material formed by laminating a polymer film onto the surface of a metal substrate. It has advantages such as corrosion resistance and ease of processing.

[0003] Traditional coated steel primarily focuses on mechanical properties and chemical resistance. However, in high-temperature or strong infrared radiation environments (such as high-temperature food sterilization and direct sunlight on buildings), its thermal insulation performance is insufficient, easily leading to heat transfer, affecting product performance, or increasing energy consumption. Existing technologies sometimes improve the thermal insulation of coated steel by adding inorganic fillers, but this suffers from low reflectivity, complex structure, and high cost. Furthermore, the addition of inorganic insulating fillers may pose a risk of toxicity or heavy metal leaching, especially at high temperatures where harmful substances may migrate, making it unsuitable for food packaging. Therefore, there is an urgent need for a coated steel structure that combines high infrared reflectivity, lightweight, ease of processing, and low cost. Utility Model Content

[0004] To address the shortcomings of the existing technology, this invention provides a heat-insulating coated iron, which aims to improve infrared reflectivity and ensure safety.

[0005] The technical solution of this utility model is as follows: a heat-insulating coated iron, comprising a metal substrate and a PET layer adhered to the surface of the metal substrate, the PET layer comprising a base layer and a conical array structure formed on the surface of the base layer, the conical array structure comprising a plurality of conical convex structures, and the side surface of the conical convex structures being provided with an Ag layer and an oxide protective layer in sequence.

[0006] Furthermore, the angle between the side surface of the tapered convex structure and the surface of the base layer is 30° to 70°.

[0007] Furthermore, the height of the conical convex structure is 0.2–1.0 μm.

[0008] Furthermore, the spacing between the tapered convex structures is 0.3–1.8 μm.

[0009] Furthermore, the base layer thickness of the PET layer is 0.05–0.1 mm.

[0010] Furthermore, the thickness of the Ag layer is 5–100 nm. Using an Ag layer with a thickness of less than 100 nm can effectively control manufacturing costs while ensuring the transmission of some visible light, thereby meeting the pattern display requirements of coated iron.

[0011] Furthermore, the thickness of the oxide protective layer is 10–50 nm.

[0012] Furthermore, the oxide protective layer is ZnO, SiO2, or Al2O3. These materials protect the Ag layer and extend its lifespan. ZnO, on the other hand, has a lower cost and, when used with the Ag layer, reduces interfacial reflection loss, thereby improving visible light transmittance.

[0013] Compared with the prior art, the advantages of the technical solution provided by this utility model are as follows:

[0014] This invention utilizes a conical convex structure formed in the PET layer to cause multiple reflections of incident light. The synergistic effect of reflection and resonance mechanisms increases the infrared reflectivity to over 92%, enhancing the material's thermal insulation performance. The resulting coated iron possesses excellent mechanical properties and aesthetic appeal. Furthermore, by improving reflectivity through its physical structure, it replaces chemical fillers, reduces the use of additives, and fundamentally avoids the risk of chemical contamination, making it suitable for food packaging. Attached Figure Description

[0015] Figure 1 The diagram shows the structure of the heat-insulating coated iron in Examples 1-3.

[0016] Figure 2 The diagram shows the structure of the heat-insulating coated iron in Examples 4 and 5.

[0017] Figure 3 The graphs show the infrared reflectance results for Examples 1-5 and the comparative examples. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading this description, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0019] Example 1, please refer to Figure 1 As shown, the heat-insulating coated iron of this embodiment includes a metal substrate 100 and a PET layer 101 adhered to the surface of the metal substrate 100. The metal substrate 100 is a chrome-plated iron plate. The PET film is adhered to the surface of the metal substrate 100 and is molded at 120-150°C. The PET film forms two parts: a planar base layer 101a and a cone array structure formed by rows and columns of conical convex structures 101b on the PET film. The thickness of the base layer 101a is 0.1 mm. The conical convex structures 101b are regular square pyramids. The angle between the cone face of the regular square pyramid and the base layer 101a is 60°. The height of the regular square pyramid is 0.45 μm. The spacing between the regular square pyramids is 0.45 μm. The base layer 101a and the regular square pyramids together constitute the PET layer 101.

[0020] By shielding the area of ​​the base layer 101a of the PET layer 101 where the conical convex structure 101b is not provided, a 25nm thick Ag layer 102 is deposited on the conical surface of a regular square pyramid, and a 15nm thick ZnO layer 103 is then deposited on the Ag layer 102.

[0021] Example 2: The heat-insulating coated iron of this example includes a metal substrate 100 and a PET layer 101 adhered to the surface of the metal substrate 100. The metal substrate 100 is a chrome-plated iron plate. The PET film is adhered to the surface of the metal substrate 100 and is molded at 120-150°C. The PET film forms two parts: a planar base layer 101a and a cone array structure composed of rows and columns of conical convex structures 101b. The thickness of the base layer 101a is 0.1 mm. The conical convex structures 101b are regular square pyramids. The angle between the cone face of the regular square pyramid and the base layer 101a is 60°. The height of the regular square pyramid is 0.45 μm. The spacing between the regular square pyramids is 0.45 μm. The base layer 101a and the regular square pyramids together constitute the PET layer 101.

[0022] By shielding the area of ​​the base layer 101a of the PET layer 101 where the conical convex structure 101b is not provided, a 15nm thick Ag layer 102 is deposited on the conical surface of a regular square pyramid, and a 15nm thick ZnO layer 103 is then deposited on the Ag layer 102.

[0023] Example 3: The heat-insulating coated iron of this example includes a metal substrate 100 and a PET layer 101 adhered to the surface of the metal substrate 100. The metal substrate 100 is a chrome-plated iron plate. The PET film is adhered to the surface of the metal substrate 100 and is molded at 120-150°C. The PET film forms two parts: a planar base layer 101a and a cone array structure composed of rows and columns of conical convex structures 101b. The thickness of the base layer 101a is 0.1 mm. The conical convex structures 101b are regular square pyramids. The angle between the pyramid face and the base layer 101a is 60°. The height of the pyramid is 0.45 μm. The spacing between the pyramids is 0.45 μm. The base layer 101a and the regular square pyramids together constitute the PET layer 101.

[0024] By shielding the area of ​​the base layer 101a of the PET layer 101 where the conical convex structure 101b is not provided, a 35nm thick Ag layer 102 is deposited on the conical surface of a regular square pyramid, and a 15nm thick ZnO layer 103 is then deposited on the Ag layer 102.

[0025] Example 4, please refer to Figure 2As shown, the heat-insulating coated iron of this embodiment includes a metal substrate 200 and a PET layer 201 adhered to the surface of the metal substrate 200. The metal substrate 200 is a chrome-plated iron plate. The PET film is adhered to the surface of the metal substrate 200 and is molded at 120-150°C. The PET film forms two parts: a planar base layer 201a and a cone array structure formed by rows and columns of conical convex structures 201b on the PET film. The thickness of the base layer 201a is 0.05 mm, and the conical convex structures 201b are cones. The angle between the generatrix of the cone and the base layer 201a is 30°, the height of the cone is 0.2 μm, and the spacing between the cones is 1.0 μm. The base layer 201a and the cones together constitute the PET layer 201.

[0026] By shielding the area of ​​the base layer 201a of the PET layer 201 where the conical convex structure 201b is not provided, a 60nm thick Ag layer 202 is deposited on the conical surface of the cone, and a 25nm thick Al2O3 layer 203 is then deposited on the Ag layer 202. The Al2O3 layer 203 has higher hardness, but higher cost.

[0027] Example 5: The heat-insulating coated iron of this example includes a metal substrate and a PET layer adhered to the surface of the metal substrate. The metal substrate is a chrome-plated iron plate. The PET film is adhered to the surface of the metal substrate and is molded at 120-150°C. The PET film forms two parts: one part is a planar base layer, and the other part is a cone array structure formed by rows and columns of conical convex structures on the PET film. The thickness of the base layer is 0.05 mm, the conical convex structures are cones, the angle between the generatrix of the cone and the base layer is 70°, the height of the cone is 1.0 μm, and the spacing between the cones is 1.8 μm. The base layer and the cones together constitute the PET layer.

[0028] By shielding the areas of the PET layer base layer that do not have a conical convex structure, a 100nm thick Ag layer is deposited on the conical surface of the cone. A 50nm thick SiO2 layer is then deposited on the Ag layer. The SiO2 layer has a low refractive index, which will cause some reflection loss.

[0029] In comparison, a 0.1mm thick PET layer was adhered to the surface of a chrome-plated iron sheet.

[0030] The reflectivity of light with wavelengths of 0.8–1.8 μm in the above embodiments and comparative examples was simulated and calculated, and the results are as follows: Figure 3 As shown, this invention can improve the reflectivity of coated iron to infrared light to over 92%.

Claims

1. A heat-insulating type laminated iron sheet comprising a metal substrate and a PET layer adhered to the surface of the metal substrate, characterized in that, The PET layer comprises a base layer and a conical array structure formed on the surface of the base layer, wherein the conical array structure comprises a plurality of conical convex structures, and the side surface of the conical convex structure is sequentially provided with an Ag layer and an oxide protective layer.

2. The heat shield type laminated iron according to claim 1, wherein The included angle between the side surface of the conical convex structure and the surface of the base layer is 30°-70°.

3. The heat shield type laminated iron according to claim 1, wherein The height of the conical convex structure is 0.2-1.0 μm.

4. The heat shield type laminated iron according to claim 1, wherein The pitch of the conical convex structure is 0.3-1.8 μm.

5. The heat shield type laminated iron according to claim 1, wherein The thickness of the base layer of the PET layer is 0.05-0.1 mm.

6. The heat shield type laminated iron according to claim 1, wherein The thickness of the Ag layer is 5-100 nm.

7. The heat shield type laminated iron according to claim 1, wherein The thickness of the oxide protective layer is 10-50 nm.

8. The heat shield type laminated iron according to claim 1, wherein The oxide protective layer is ZnO, SiO2 or Al2O3.

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