Honeycomb composite board for refrigerator car and preparation method of honeycomb composite board

Abstract

The invention relates to a honeycomb composite board for a refrigerator car and a preparation method of the honeycomb composite board, and aims to provide a structural material which is high in strength, light in weight and excellent in heat insulation performance and corrosion resistance so as to improve the heat preservation effect and the overall durability of the refrigerator car in the transportation process. The composite board adopts a double-sided honeycomb structure design; the composite material sequentially comprises an outermost layer of high-strength aluminum alloy or stainless steel, a surface treatment layer of a polymer coating or a ceramic coating, an outer honeycomb layer of a high-strength honeycomb structure composite material, a middle heat insulation layer of an aerogel material and an inner honeycomb layer of a light high-strength honeycomb structure composite material from outside to inside. An inner surface layer of a high strength fiber composite coated with a nanocoating, and an additional layer of high density polyethylene (HDPE) or polypropylene (PP). Compared with the prior art, the composite board has a better heat insulation effect and durability, the service life of the refrigerator car can be remarkably prolonged, and the composite board is particularly suitable for the fields of cold-chain logistics and transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerated transportation technology, and in particular to a honeycomb composite panel for a refrigerated vehicle and a preparation method thereof. Background Art

[0002] In the modern logistics and transportation industry, refrigerated trucks are key equipment to ensure the safe transportation of important goods such as perishable foods, medicines, and biological products. The design of refrigerated trucks requires good thermal insulation performance, sufficient strength to withstand various external forces during transportation, and the ability to resist corrosion and wear. As the market demand for refrigerated transportation continues to increase, the material and structural design of traditional refrigerated trucks have gradually revealed their limitations.

[0003] 1. Limitations of traditional refrigerated truck panels

[0004] The panels used in traditional refrigerated trucks are mainly single-layer aluminum panels, polyurethane foam panels or other composite materials. These materials have achieved lightweight and thermal insulation effects to a certain extent, but in practical applications, there are still the following major problems:

[0005] Insufficient thermal insulation performance: Although thermal insulation materials such as polyurethane foam can provide a certain thermal insulation effect, their thermal insulation performance will gradually decrease after long-term use and cannot meet the thermal insulation needs during long-distance transportation.

[0006] Limited impact resistance: Most traditional panels have poor impact resistance and are easily damaged by external forces during transportation, which in turn affects the refrigeration effect.

[0007] Poor corrosion resistance: Traditional materials are easily damaged in wet and corrosive environments, resulting in a shortened service life and increased maintenance costs.

[0008] Heavy weight: Many traditional refrigerated trucks use heavy panels, which increases the burden on the entire vehicle, fuel consumption and operating costs.

[0009] 2. Current technology development needs

[0010] In order to improve the overall performance of refrigerated trucks and meet market demand, the relevant industry urgently needs to develop new composite materials. These materials should have the following characteristics:

[0011] Excellent thermal insulation performance: The new material should be able to effectively block external heat, maintain a stable temperature inside the vehicle, and ensure the safety of the cargo.

[0012] High strength and light weight: The material should have sufficient strength to withstand external impacts. At the same time, while meeting the strength requirements, the weight should be reduced as much as possible to reduce transportation costs.

[0013] Good corrosion resistance: In the changing transportation environment, the material should be resistant to corrosion and wear to extend the service life and reduce maintenance costs.

[0014] Environmental protection: With the tightening of environmental protection regulations, new refrigerated truck materials must also meet environmental protection requirements and should not cause pollution to the environment.

[0015] 3. Advantages of honeycomb structure materials

[0016] In recent years, honeycomb structural materials have been gradually used in refrigerated trucks and other transportation vehicles due to their excellent performance. Honeycomb materials can effectively improve the performance of refrigerated trucks with their lightweight and high strength characteristics. The honeycomb structure provides greater mechanical strength, and at the same time, due to its internal cavity structure, it effectively reduces the overall weight.

[0017] By introducing new insulation materials (such as aerogel) and coating technologies (such as nano-coating) into the honeycomb structure, the overall performance of refrigerated trucks can be greatly improved to meet the comprehensive needs of insulation, strength and durability during long-distance transportation. The development of this technology has brought new opportunities and challenges to the refrigerated truck industry, and also provided a broad space for related research and development.

[0018] In summary, in view of the shortcomings of existing refrigerated truck materials, the present invention aims to overcome the limitations of traditional refrigerated truck panels through an innovative double-sided honeycomb structure design and material combination, and provide a more efficient, durable and environmentally friendly solution for refrigerated transportation. Summary of the invention

[0019] The present invention relates to a honeycomb composite panel for a refrigerated truck and a preparation method thereof, aiming to provide a structural material for a refrigerated truck with high strength, light weight, excellent thermal insulation performance and durability, so as to solve the problems of poor thermal insulation effect, weak impact resistance, insufficient corrosion resistance and the like of existing refrigerated truck panels during use.

[0020] The honeycomb composite panel for refrigerated vehicles adopts an innovative double-sided honeycomb structure design, and through a reasonable multi-layer structure arrangement, it ensures that the material has excellent performance. From the outside to the inside, the composite panel is divided into multiple layers, including the outermost layer, high-strength honeycomb layer, middle insulation layer, inner honeycomb layer, inner surface layer and additional layer. The materials of each layer are carefully selected and designed, so that the composite panel can not only resist the influence of the external environment, but also maintain a stable temperature during transportation.

[0021] The outermost layer is made of high-strength aluminum alloy or stainless steel, and the outer surface is coated with a polymer coating or a ceramic coating, which can provide excellent corrosion resistance and wear resistance, and at the same time has a certain self-cleaning function.

[0022] The outer honeycomb layer adopts high-strength honeycomb structure composite material, combined with reasonable pore size and wall thickness design, which improves the overall impact resistance and durability.

[0023] The middle insulation layer introduces aerogel material with a thickness of 3-5mm and ultra-low thermal conductivity, which significantly improves the thermal insulation performance of the refrigerated truck panel and effectively reduces energy loss.

[0024] The inner honeycomb layer is a lightweight and high-strength honeycomb structure composite material, which not only maintains the strength of the structure but also reduces the overall weight.

[0025] The inner surface layer uses a high-strength fiber composite material and is coated with a nano-coating on the surface to enhance wear resistance, antibacterial and antimicrobial properties, extending the service life of the board.

[0026] In addition, the present invention also introduces an additional layer made of high-density polyethylene (HDPE) or polypropylene (PP), which further improves the waterproof performance of the composite board and the durability of the overall structure.

[0027] The present invention not only optimizes the material selection, but also innovatively designs the preparation method. Through hot pressing technology, each layer of material can be firmly combined together to form a composite board with stable structure and excellent performance. The preparation process includes step-by-step processing and precision machining of multiple layers of materials to ensure that the functions of each layer structure can be fully utilized, and realize the high efficiency, reliability and long-term performance of honeycomb composite panels for refrigerated vehicles in practical applications.

[0028] Through the above-mentioned multi-layer design and preparation process, the present invention effectively solves the problems existing in existing refrigerated truck plates, especially has significant advantages in terms of thermal insulation, strength, lightness and durability, and greatly improves the performance of refrigerated trucks in long-distance transportation.

[0029] Beneficial effects of the present invention:

[0030] 1. The present invention adopts a double-sided honeycomb structure design. The outer honeycomb layer and the inner honeycomb layer are both made of high-strength materials, which significantly improves the impact resistance and compressive strength of the board. The middle insulation layer uses aerogel material with extremely low thermal conductivity, which effectively blocks the heat transfer between the inside of the refrigerated truck and the outside world, ensuring a good thermal insulation effect. The outermost layer is coated with a polymer coating or a ceramic coating. Combined with the nano-coating treatment on the inner surface, the board of the present invention can be used for a long time in an environment with high humidity and strong corrosion. Although it has a multi-layer structure, the present invention uses lightweight materials such as aluminum honeycomb and carbon fiber honeycomb to minimize the weight of the board, which helps to reduce the energy consumption of the refrigerated truck. The composite board material has been tested and has no damage at extremely low temperatures (-50°C) and high temperatures (80°C), which can meet the refrigerated transportation needs under various climatic conditions. In summary, the honeycomb composite board for refrigerated trucks of the present invention successfully solves the problems of insufficient thermal insulation, strength and corrosion resistance in the prior art through innovative material selection and structural design, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the layered structure of the composite plate of the present invention;

[0033] Figure 2 Schematic diagram of the layered structure of the composite plate of the present invention;

[0034] Figure 3 The figure is a schematic diagram of the processing process of the composite board of the present invention.

[0035] The markings in the figure are:

[0036] 100, outermost layer; 200, outer honeycomb layer; 300, middle insulation layer; 400, inner honeycomb layer; 500, inner surface layer; 600, additional layer. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0038] The present invention provides a honeycomb composite panel for refrigerated trucks, which adopts an upgraded double-sided honeycomb structure design. The structure has high strength, excellent thermal insulation performance and lightweight characteristics, and is suitable for the body manufacturing of refrigerated trucks. The specific implementation is as follows:

[0039] Example 1

[0040] The structure of the honeycomb composite panel for refrigerated vehicles of the present invention comprises the following layers from outside to inside:

[0041] Outermost layer: A high-strength aluminum alloy with a thickness of 1.5 mm is selected as the outer substrate, and the surface is smooth and flawless after mechanical polishing. After that, a polymer coating with a thickness of 100 μm is sprayed, which can be polytetrafluoroethylene (PTFE), which has excellent corrosion resistance and weather resistance. The coating is cured at 180°C for 30 minutes through a curing device to ensure that it is closely attached to the surface of the aluminum alloy.

[0042] Outer honeycomb layer: A 20mm thick aluminum honeycomb structure composite material is used as the outer honeycomb layer. The honeycomb aperture of this material is 8mm, the wall thickness is 0.06mm, and it has high strength and good impact resistance. The outer honeycomb layer is firmly attached to the outermost polymer coating through hot melt composite technology.

[0043] Middle insulation layer: The middle insulation layer is made of 5mm thick aerogel material. Aerogel has extremely low thermal conductivity, which can effectively block heat transfer and significantly improve the insulation effect of refrigerated trucks. The aerogel is cut into a size that matches the honeycomb panel, and the aerogel layer is tightly attached to the inner side of the outer honeycomb layer through lamination technology.

[0044] Inner honeycomb layer: The inner honeycomb layer is made of lightweight and high-strength carbon fiber honeycomb structure composite material with a thickness of 15mm, a honeycomb aperture of 6mm, and a wall thickness of 0.04mm. This material has a low density and excellent strength, which can effectively reduce the weight of the board while ensuring the strength and durability of the structure. The inner honeycomb layer is pressed together with the aerogel layer through hot melt adhesive composite technology to ensure that the layers are tight and have no gaps.

[0045] Inner surface layer: The inner surface layer is a high-strength fiber composite material with a thickness of 1.0 mm. The surface of the material is evenly coated with a layer of nano coating by spraying, and the thickness of the nano coating is 50 μm. This coating not only has good corrosion resistance, but also can enhance the anti-fouling and anti-static effects of the composite material. After coating, the fiber composite material is dried at 80°C for 2 hours to ensure the curing of the nano coating.

[0046] Additional layer: The additional layer is made of high-density polyethylene (HDPE) with a thickness of 2mm. This layer is located on the outside of the outer honeycomb layer and the inner honeycomb layer, providing additional impact protection and corrosion resistance. The additional layer is connected to the honeycomb layer through hot-melt composite technology to increase the strength and durability of the overall structure.

[0047] Example 2

[0048] Different from Example 1, the outermost layer of this embodiment is made of stainless steel with a thickness of 1.2 mm, which is pickled and mechanically polished, and then sprayed with a ceramic coating with a thickness of 80 μm. The ceramic coating is cured at 220° C. for 30 minutes to improve its wear resistance and corrosion resistance. The remaining layers and processes are the same as those of Example 1.

[0049] Example 3

[0050] In this embodiment, the added layer material is polypropylene (PP) with a thickness of 2.5 mm, replacing the high-density polyethylene (HDPE) in Examples 1 and 2. Polypropylene material has better chemical corrosion resistance and flexibility, and can maintain good performance in extremely low temperature environments. The added layer is attached to the outer sides of the inner and outer honeycomb layers by hot melt lamination technology.

[0051] Preparation process

[0052] Material preparation: Select the appropriate substrate and cut it into specified size according to design requirements.

[0053] Surface treatment: The outer and inner substrate surfaces are polished, pickled, etc., and a protective coating (such as a polymer coating or a ceramic coating) is sprayed. The coating is cured to ensure its adhesion and durability.

[0054] Honeycomb layer manufacturing: Aluminum honeycomb materials and carbon fiber honeycomb materials are used, and the outer honeycomb layer and the inner honeycomb layer are made by cutting, pressing and other processes to ensure the uniformity of the honeycomb structure.

[0055] Installation of the middle insulation layer: Cut the aerogel material into a size that matches the honeycomb structure, and use a pressing process to fit it tightly to the honeycomb layer.

[0056] Installation of additional layer: Choose HDPE or PP material as the additional layer, and compound it with the honeycomb layer through hot-melt technology after cutting to ensure the tight connection between the additional layer and other layers.

[0057] Overall pressing and curing: After all the layers are assembled, a laminator is used to apply appropriate pressure and temperature to the overall board for pressing. After pressing, the board is kept at the appropriate temperature and time in the curing equipment to improve the stability of the overall structure.

[0058] The following are some Chinese national standard numbers commonly used for material performance testing, which are applicable to the relevant testing of composite material panels for refrigerated vehicles. According to these standards, composite materials can be tested in many aspects.

[0059] Impact resistance testing standards:

[0060] Standard number: GB / T 1453-2005 "Test method for impact resistance of honeycomb core"

[0061] Compressive strength test standard:

[0062] Standard number: GB / T 1456-2005 "Test method for compressive strength of honeycomb core"

[0063] Thermal insulation performance testing standards:

[0064] Standard number: GB / T 13475-2008 "Standard heat transfer properties of building materials and products - Calibration and guarded hot box method"

[0065] Corrosion resistance test standard:

[0066] Standard number: GB / T 2423.17-2008 "Environmental testing for electrical and electronic products Part 2: Test method Test Ka: Salt spray"

[0067] Weight testing standards:

[0068] Standard number: GB / T 38262-2019 "Test method for density and weight of composite materials"

[0069] Low temperature resistance test standard:

[0070] Standard number: GB / T 2423.1-2008 "Environmental testing for electrical and electronic products Part 2: Test methods Test A: Low temperature"

[0071] High temperature resistance test standard:

[0072] Standard number: GB / T 2423.2-2008 "Environmental testing for electrical and electronic products Part 2: Test methods Test B: High temperature"

[0073] Waterproof performance testing standards:

[0074] Standard number: GB / T 1040.3-2006 "Test method for tensile properties of plastics".

[0075]

[0076] After comprehensive evaluation, Example 2 showed the best performance in various tests, especially in terms of corrosion resistance and compressive strength, and was therefore selected as the best example.

[0077] The honeycomb composite panel for refrigerated vehicles of the present invention has excellent impact resistance, heat insulation effect and corrosion resistance. Its double-sided honeycomb structure design greatly reduces the weight while ensuring strength, reduces the overall energy consumption of refrigerated vehicles, and improves transportation efficiency.

[0078] This embodiment has described the best embodiment of the present invention, but the present invention is not limited to the concrete form of this field. Any technician familiar with this field can modify or replace it with equivalents without departing from the spirit of the present invention, and all these modifications or replacement schemes belong to the protection scope of the present invention.

Claims

1. A honeycomb composite panel for a refrigerated vehicle, characterized in that: The composite panel adopts a double-sided honeycomb structure design, which includes: The outermost layer (100) is a high-strength aluminum alloy or stainless steel, and the surface is coated with a polymer coating or a ceramic coating; The outer honeycomb layer (200) is a high-strength honeycomb structure composite material, the honeycomb aperture is 6-8 mm, and the wall thickness is 0.04-0.06 mm; The middle heat insulation layer (300) is made of aerogel material with a thickness of 3-5 mm, and the aerogel has an ultra-low thermal conductivity; The inner honeycomb layer (400) is a lightweight and high-strength honeycomb structure composite material, which has excellent mechanical properties and toughness; The inner surface layer (500) is a high-strength fiber composite material, and the surface is coated with a nano coating, wherein the nano coating has self-cleaning and antibacterial properties; The additional layer (600) is any one of high-density polyethylene (HDPE) or polypropylene (PP) to improve the overall durability and waterproof performance.

2. A honeycomb composite panel for a refrigerated vehicle according to claim 1, characterized in that: The polymer coating of the outermost layer (100) is polytetrafluoroethylene (PTFE), which has excellent high temperature resistance and corrosion resistance.

3. The honeycomb composite panel for a refrigerated vehicle according to claim 1, characterized in that: The honeycomb material of the inner honeycomb layer (400) is a carbon fiber honeycomb structure composite material, which has higher impact resistance.

4. The honeycomb composite panel for a refrigerated vehicle according to claim 1, characterized in that: The aerogel thickness of the middle thermal insulation layer (300) is 4-5 mm to optimize thermal insulation performance.

5. The honeycomb composite panel for a refrigerated vehicle according to claim 1, characterized in that: The high-strength fiber composite material of the inner surface layer (500) is a glass fiber or carbon fiber composite material.

6. The honeycomb composite panel for a refrigerated vehicle according to claim 1, characterized in that: The weight of the composite panel is 4.0-5.0 kg / m2, ensuring a lightweight design.

7. The honeycomb composite panel for a refrigerated vehicle according to claim 1, characterized in that: The material of the outer honeycomb layer (200) is aluminum alloy or plastic-based composite material, and has good strength and corrosion resistance.

8. The method for preparing a honeycomb composite panel for a refrigerated vehicle according to claim 1, characterized in that: The steps include: Step 1: preparing a high-strength aluminum alloy or stainless steel as the outermost layer (100) material, and surface treatment of a polymer coating or a ceramic coating; Step 2: preparing a high-strength honeycomb structure composite material of an outer honeycomb layer (200), and forming it through a mold; Step 3: preparing an aerogel material, heating and curing it to form a middle thermal insulation layer (300); Step 4: preparing a lightweight and high-strength honeycomb structure composite material as an inner honeycomb layer (400); Step 5: using a high-strength fiber composite material, applying a nano coating to form an inner surface layer (500); Step 6: Processing high-density polyethylene (HDPE) or polypropylene (PP) as an additional layer (600); Step 7: Compound the various layers of materials to form the final honeycomb composite panel for refrigerated vehicles.

9. The method for preparing a honeycomb composite panel for a refrigerated vehicle according to claim 8, characterized in that: The composite process adopts hot pressing technology to ensure good bonding of each layer of materials.

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