Environment-friendly automobile engine cover heat insulation pad

Abstract

The utility model discloses an environmental protection type car engine cover heat insulation pad, including laminated composite heat insulation sound absorption base layer, first adhesive layer and function surface layer, heat insulation sound absorption base layer is with environmental protection type polyethylene terephthalate fiber and low melting point polyethylene terephthalate fiber through hot press forming integrated structure, wherein low melting point polyethylene terephthalate fiber is as internal binder, melts and bonds fixed environmental protection type polyethylene terephthalate fiber in hot pressing process, function surface layer is fixedly combined on at least one surface of heat insulation sound absorption base layer through first adhesive layer, this environmental protection type car engine cover heat insulation pad adopts the recycled PET with low melting point LPET fiber, realizes the clean production of no peculiar smell, no formaldehyde through hot press process, and the product can be recycled and used, realizes the whole life cycle environmental protection from the source to the terminal, and has excellent heat insulation and sound insulation performance, remarkable light weight effect and high -grade flame -retardant safety simultaneously.

Description

Technical Field

[0001] This utility model relates to an environmentally friendly automotive hood heat insulation pad, belonging to the technical field of hood heat insulation pads. Background Technology

[0002] The hood heat insulation pad is a key functional component in the automotive acoustics and thermal management system, and its performance directly affects vehicle safety, ride comfort, and component durability. In practical applications, this component must simultaneously achieve three core functions: First, it effectively blocks the high temperatures generated in the engine compartment from being transmitted to the hood sheet metal, preventing the paint from aging and cracking due to prolonged high-temperature baking, while also slowing down the thermal degradation of rubber seals and electronic components around the engine compartment; second, it absorbs low-to-mid-frequency structural noise and airborne noise generated during engine operation through its own structure, reducing the efficiency of noise transmission to the passenger compartment and improving the quietness of the passenger space; and third, it helps optimize the internal thermal environment of the engine compartment, preventing excessively high local temperatures from affecting the operational stability of the engine and its components.

[0003] The traditional hood heat insulation pads widely used in the industry currently follow a relatively fixed technical approach: they generally use two-stage open-pore cotton as the core material, combined with phenolic resin as a binder, and are formed through a pressing process. This technical solution once dominated the market due to its low raw material costs and mature production process. However, as the automotive industry's requirements for environmental protection, health, and durability continue to increase, the inherent shortcomings of this traditional solution have gradually become apparent, making it difficult to adapt to the new demands of industry development.

[0004] The core drawbacks of traditional heat insulation pads are mainly reflected in three aspects: First, phenolic resin continuously releases volatile organic compounds such as formaldehyde and phenol during the production and curing stages and during long-term vehicle use. This not only poses a threat to the occupational health of workers in the production process but also becomes an important source of air pollution inside the vehicle, harming the health of drivers and passengers. Second, the components of the secondary open-fiber cotton substrate and the phenolic resin adhesive are highly heterogeneous, and the phenolic resin forms an irreversible cross-linked structure after curing. This makes it impossible to effectively disassemble and recycle the materials after the product is scrapped, and it can only be disposed of through landfill or incineration, which not only wastes resources but also easily causes secondary environmental pollution. Third, the fiber structure of secondary open-fiber cotton is relatively loose. After curing with phenolic resin, it is prone to embrittlement and interlayer separation. Under the long-term operating conditions of high temperature and vibration in the engine compartment, the heat insulation and sound insulation performance will rapidly degrade, making it difficult to meet the long-term durability requirements of automotive parts.

[0005] In recent years, global environmental regulations have become increasingly stringent. Against this backdrop, traditional phenolic resin-based hood heat insulation pads can no longer meet regulatory requirements and market demands. Developing an environmentally friendly hood heat insulation pad that combines no release of harmful substances, recyclability, high performance, and high durability has become an urgent need for the industry. Utility Model Content

[0006] The purpose of this utility model is to provide an environmentally friendly car hood heat insulation pad to solve the above problems. It uses recycled PET and low melting point LPET fiber, and achieves clean production without odor or formaldehyde through hot pressing process. The product can be recycled and reused, which is more environmentally friendly, and at the same time has excellent heat insulation and sound insulation performance.

[0007] This utility model achieves the above-mentioned objective through the following technical solution: an environmentally friendly automotive hood heat insulation pad, comprising a layered composite heat-insulating and sound-absorbing base layer, a first adhesive layer, and a functional surface layer; the heat-insulating and sound-absorbing base layer is an integrated structure formed by hot pressing environmentally friendly polyethylene terephthalate fiber and low-melting-point polyethylene terephthalate fiber; the functional surface layer is fixedly composited to at least one surface of the heat-insulating and sound-absorbing base layer through the first adhesive layer.

[0008] Preferably, the functional surface layer is a double-layer structure composed of a vacuum-metallized film and a polyester nonwoven fabric.

[0009] Preferably, the polyester nonwoven fabric is located away from the outer surface of the heat-insulating and sound-absorbing substrate layer, and the vacuum-metallized film is stacked between the polyester nonwoven fabric and the first adhesive layer.

[0010] Preferably, an enhanced flame-retardant layer is further provided on another surface of the heat-insulating and sound-absorbing base layer, and the enhanced flame-retardant layer is connected to the heat-insulating and sound-absorbing base layer through a second adhesive layer.

[0011] Preferably, the material of the reinforced flame retardant layer is the same as that of the heat-insulating and sound-absorbing base layer, and it is composed of a halogen-free flame retardant uniformly dispersed in its fibers.

[0012] Preferably, the first adhesive layer and the second adhesive layer are hot melt adhesive webs.

[0013] Preferably, the density of the heat-insulating and sound-absorbing substrate layer is 0.80 g / cm³ to 0.90 g / cm³.

[0014] Preferably, the environmentally friendly polyethylene terephthalate fiber is recycled polyethylene terephthalate fiber.

[0015] The beneficial effects of this utility model are as follows: The heat-insulating and sound-absorbing base layer innovatively uses recycled PET and low-melting-point LPET fibers as the base materials, and is integrally molded by hot pressing. This eliminates the use of phenolic resin, which releases harmful substances such as formaldehyde and phenol, thus achieving a cleaner production process and an odorless end product. At the same time, since the material composition is simple and consists entirely of recyclable polyester, the product can be efficiently recycled and reused after its service life, realizing a green cycle throughout its entire life cycle from production and use to regeneration. The unique PET / LPET fiber matrix itself has excellent sound insulation, sound absorption, and heat insulation properties. On the other hand, the functional surface layer composited on it efficiently reflects the radiant heat of the engine compartment. In addition, by enhancing the flame-retardant layer, an effective passive fire barrier is constructed. This flame-retardant layer uses halogen-free environmentally friendly flame retardants, which can effectively delay the spread of flames and suppress smoke generation in open flame environments, enabling the components to meet the high standards of flame-retardant safety requirements of the automotive industry, making it highly practical. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a frontal view of the overall structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the functional surface layer in this utility model.

[0019] In the diagram: 1. Heat-insulating and sound-absorbing base layer; 2. First adhesive layer; 3. Functional surface layer; 301. Vacuum-metallized film; 302. Polyester non-woven fabric; 4. Reinforcing flame-retardant layer; 5. Second adhesive layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-3As shown, an environmentally friendly automotive hood heat insulation pad includes a laminated composite heat-insulating and sound-absorbing base layer 1, a first adhesive layer 2, and a functional surface layer 3. The heat-insulating and sound-absorbing base layer 1 is an integrated structure formed by hot pressing environmentally friendly polyethylene terephthalate (PET) fiber and low-melting-point PET fiber, wherein the low-melting-point PET fiber serves as an internal binder, melting during the hot pressing process and bonding and fixing the environmentally friendly PET fiber. The functional surface layer 3 is fixedly laminated to at least one surface of the heat-insulating and sound-absorbing base layer 1 through the first adhesive layer 2.

[0022] In actual vehicle operation, the composite layered structure of the hood heat insulation pad works synergistically to build an efficient thermal management and acoustic control system. The broadband noise generated by the engine is first effectively absorbed and attenuated by the heat insulation and sound absorption base layer 1, significantly reducing the noise transmission to the cockpit. At the same time, the heat emitted from the engine compartment, especially radiant heat, is efficiently reflected by the vacuum-plated aluminum film 301 in the uppermost functional surface layer 3 after penetrating the heat insulation and sound absorption base layer 1. The heat insulation and sound absorption base layer 1 itself also blocks heat conduction through the fiber matrix. This dual heat insulation mechanism of absorption and reflection jointly protects the hood paint from high-temperature aging. In addition, all material layers remain stable in the high-temperature environment of the engine compartment, with no odor or release of harmful substances.

[0023] The functional surface layer 3 is a double-layer structure composed of a vacuum-metallized film 301 and a polyester nonwoven fabric 302. The polyester nonwoven fabric 302 is away from the outer surface of the heat-insulating and sound-absorbing base layer 1, and the vacuum-metallized film 301 is stacked between the polyester nonwoven fabric 302 and the first adhesive layer 2.

[0024] In practical applications, the double-layer structure of the functional surface layer 3 plays a crucial role. When the radiant heat from the engine compartment is transferred upwards, it is first efficiently reflected by the vacuum-aluminized film 301 adjacent to the first adhesive layer 2, forming the first heat insulation barrier. The residual heat that is not reflected is further blocked and dispersed when it comes into contact with the outer polyester nonwoven fabric 302. This design ensures that the vacuum-aluminized film 301 is always protected by the polyester nonwoven fabric 302, preventing scratches and oxidation, and maintaining high reflectivity for a long time. At the same time, the surface of the polyester nonwoven fabric 302 is delicate and wear-resistant, and has the practical functions of dust prevention and beautifying the appearance of the engine compartment.

[0025] On the other surface of the heat-insulating and sound-absorbing base layer 1, there is also a reinforced flame-retardant layer 4. The reinforced flame-retardant layer 4 is connected to the heat-insulating and sound-absorbing base layer 1 through the second adhesive layer 5. The material of the reinforced flame-retardant layer 4 is the same as that of the heat-insulating and sound-absorbing base layer 1, and it is composed of a halogen-free flame retardant uniformly dispersed in its fibers.

[0026] In actual use, when abnormal high temperature or sudden open flame occurs in the engine compartment, the reinforced flame-retardant layer 4 located below the heat-insulating and sound-absorbing base layer 1 immediately comes into play. Its uniformly dispersed halogen-free flame retardant rapidly generates an expanded carbon layer at high temperature, effectively blocking oxygen and inhibiting the spread of flames to the main body of the heat insulation pad. The material of this layer has the same properties as the heat-insulating and sound-absorbing base layer 1, ensuring that the two have the same coefficient of thermal expansion, avoiding interlayer separation. At the same time, the environmentally friendly flame-retardant system does not release toxic gases at high temperature, taking into account both safety and environmental protection requirements, and providing reliable passive fire protection for the engine compartment.

[0027] The first adhesive layer 2 and the second adhesive layer 5 are hot melt adhesive webs. In the actual production process, hot melt adhesive webs are used as the first adhesive layer 2 and the second adhesive layer 5. After being heated by hot pressing, they melt and penetrate, forming a uniform and dense adhesive interface between the functional surface layer 3 and the heat-insulating and sound-absorbing base layer 1, and between the heat-insulating and sound-absorbing base layer 1 and the reinforced flame-retardant layer 4. After cooling and curing, they produce a long-lasting and strong adhesive force. This solvent-free bonding method eliminates the release of volatile organic compounds from traditional adhesives, which not only enables the multi-layer structure to achieve stable composite, but also ensures that the product maintains its environmental protection characteristics throughout its entire life cycle.

[0028] The density of the heat-insulating and sound-absorbing base layer 1 is 0.80 g / cm³ to 0.90 g / cm³. The structure achieves the best balance between lightweight and performance. In practical applications, this density range ensures that enough closed pores are formed between the fibers to effectively block heat conduction and absorb broadband noise, while avoiding the increase in weight and the decrease in sound absorption performance caused by excessive material density.

[0029] The environmentally friendly polyethylene terephthalate fiber is recycled polyethylene terephthalate fiber, and the thermal insulation pad achieves resource recycling at the beginning of its life cycle.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An environmentally friendly automotive hood heat insulation pad, characterized in that: It includes a composite heat-insulating and sound-absorbing base layer (1), a first adhesive layer (2), and a functional surface layer (3); The heat-insulating and sound-absorbing base layer (1) is an integrated structure formed by hot pressing of environmentally friendly polyethylene terephthalate fiber and low-melting-point polyethylene terephthalate fiber; The functional surface layer (3) is fixedly bonded to at least one surface of the heat-insulating and sound-absorbing base layer (1) by the first adhesive layer (2).

2. The environmentally friendly automotive hood heat insulation pad according to claim 1, characterized in that: The functional surface layer (3) is a double-layer structure composed of a vacuum-deposited aluminum film (301) and a polyester nonwoven fabric (302).

3. The environmentally friendly automotive hood heat insulation pad according to claim 2, characterized in that: The polyester nonwoven fabric (302) is located away from the outer surface of the heat-insulating and sound-absorbing base layer (1), and the vacuum-metallized film (301) is stacked between the polyester nonwoven fabric (302) and the first adhesive layer (2).

4. The environmentally friendly automotive hood heat insulation pad according to claim 1, characterized in that: An enhanced flame-retardant layer (4) is also provided on another surface of the heat-insulating and sound-absorbing base layer (1), and the enhanced flame-retardant layer (4) is connected to the heat-insulating and sound-absorbing base layer (1) through a second adhesive layer (5).

5. The environmentally friendly automotive hood heat insulation pad according to claim 4, characterized in that: The enhanced flame retardant layer (4) is made of the same material as the heat insulation and sound absorption base layer (1) and is composed of a halogen-free flame retardant uniformly dispersed in its fibers.

6. The environmentally friendly automotive hood heat insulation pad according to claim 4, characterized in that: The first adhesive layer (2) and the second adhesive layer (5) are hot melt adhesive mesh.

7. The environmentally friendly automotive hood heat insulation pad according to claim 1, characterized in that: The density of the heat-insulating and sound-absorbing base layer (1) is 0.80 g / cm³ to 0.90 g / cm³.

8. The environmentally friendly automotive hood heat insulation pad according to claim 1, characterized in that: The environmentally friendly polyethylene terephthalate fiber is a recycled polyethylene terephthalate fiber.

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