Automobile sunroof heat insulation film structure

Abstract

The utility model relates to an automobile sunroof heat insulation film structure, including from top to bottom setting in proper order the pasting cloth no. 1, sponge structure layer, pasting cloth no. 2, pressure sensitive silicon gel layer and PE release film, pasting cloth is dacron non -woven fabric, is divided into non -woven fabric and the pasting glue of bottom, pasting glue and sponge structure layer top pasting, thickness is 0.5 1.5mm, soft and easy to curved surface pasting, sponge structure layer is made of polyurethane, is closed cell foam structure, and the heat conductivity coefficient is less than or equal to 0.025 W (m K), and has the function of heat insulation, sound insulation, sound absorption and vibration reduction, and pressure sensitive silicon gel layer is polyurethane pressure sensitive adhesive, has excellent adhesion, water resistance and chemical resistance, keeps stable adhesion in complex environment, and is not easy to produce bubble or fall off. The automobile sunroof heat insulation film structure, through the sponge structure layer adopts polyurethane closed cell foam, significantly reduces the weight, and the low heat conductivity coefficient effectively blocks the heat transfer, to realize the advantages such as sunroof heat insulation film light weight and good heat insulation performance.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive sunroof accessories, specifically to an automotive sunroof heat insulation film structure, which is particularly suitable for the heat insulation and weight reduction requirements of sunroofs in new energy vehicles. Background Technology

[0002] Traditional sunroofs in new energy vehicles mostly use glass with a PVC electrostatic film as an insulation layer. However, the PVC electrostatic film is prone to detachment under high temperatures and direct sunlight due to insufficient electrostatic adhesion, and its insulation effect is limited. Furthermore, glass sunroofs are relatively heavy, increasing the vehicle's energy consumption. While some existing insulation films attempt to improve this, most have not solved the problem of balancing weight and insulation performance, or are prone to problems such as bubbles and scratches when applied to complex curved surfaces. Therefore, there is an urgent need for an automotive sunroof insulation film structure that combines lightweight design, high insulation performance, strong adhesion, and weather resistance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a heat insulation film structure for automotive sunroofs, which has advantages such as high adhesion and weather resistance, as well as lightweight glass sunroofs and heat insulation performance, solving the problems of traditional PVC films being easy to fall off, having poor heat insulation effect, and being heavy.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a heat insulation film structure for an automotive sunroof, comprising, from top to bottom, a first bonding fabric, a sponge structure layer, a second bonding fabric, a pressure-sensitive silicone layer, and a PE release film.

[0005] Furthermore, the adhesive at the bottom of the bonding fabric is bonded to the top of the sponge structure layer, with a thickness of 0.5-2.5mm, which is soft and easy to bond to curved surfaces.

[0006] Furthermore, the sponge structural layer is made of polyurethane, which is a closed-cell foam structure with a thermal conductivity of ≤0.025 W / (m·K), and has the functions of heat insulation, sound insulation, sound absorption and vibration reduction.

[0007] Furthermore, the pressure-sensitive silicone layer is made of polyurethane pressure-sensitive adhesive, which has excellent adhesion, water resistance and chemical resistance, maintains stable adhesion in complex environments and is not prone to bubble formation or peeling.

[0008] Furthermore, the PE release film is made of polyethylene, which is resistant to low temperatures and tearing. Its surface is optimized with anti-static and anti-scratch processes to ensure reliable bonding.

[0009] Furthermore, a reinforcing fiber layer is added between the bonding fabric and the sponge structural layer to improve tensile strength.

[0010] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0011] 1. The structure of this automotive sunroof heat insulation film uses polyurethane closed-cell foam in the sponge structure layer, which significantly reduces weight. At the same time, the low thermal conductivity effectively blocks heat transfer, thus achieving the advantages of lightweight sunroof heat insulation film and good heat insulation performance.

[0012] 2. The structure of this automotive sunroof heat insulation film maintains stable adhesion in high temperature, low temperature and humid environment through the pressure-sensitive silicone layer, which solves the problem of easy peeling of PVC film. The anti-static and scratch-resistant design of PE release film ensures a flawless bonding process. It is suitable for complex curved sunroofs. At the same time, the multi-functional integrated film also has sound insulation and vibration reduction functions, improving comfort. Attached Figure Description

[0013] Fig. 1 This is a schematic diagram of the structure of the automotive sunroof heat insulation film of this utility model;

[0014] Fig. 2 This is a data comparison diagram of the automotive sunroof heat insulation film structure of this utility model.

[0015] In the diagram: 1. Adhesive fabric one; 2. Sponge structure layer; 3. Adhesive fabric two; 4. Pressure-sensitive silicone layer; 5. PE release film. Detailed Implementation

[0016] 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.

[0017] Please see Figs. 1-2 The automotive sunroof heat insulation film structure in this embodiment includes, from top to bottom, an adhesive fabric 1, a sponge structure layer 2, a pressure-sensitive silicone layer 3, and a PE release film 4. The bonding fabric 1 is a polyester non-woven fabric; The sponge structure layer 2 is made of polyurethane, which can be used for heat insulation, sound insulation, sound absorption and vibration reduction; The pressure-sensitive silicone layer 3 is made of polyurethane pressure-sensitive adhesive. With its excellent adhesion, water resistance and chemical resistance, it can maintain a stable adhesion effect in complex and ever-changing environments and is not prone to bubbles or peeling.

[0018] PE release film 4 is made of polyethylene (PE), which has excellent low-temperature resistance and is suitable for bonding to the complex curved surfaces of car sunroofs. It has high rigidity, tear resistance and resistance to environmental stress cracking, ensuring long-term reliability. The surface is optimized through anti-static and anti-scratch processes to avoid static electricity or scratches during bonding.

[0019] Example 1: Infrastructure Implementation

[0020] 1. Laminating Fabric 1 and Laminating Fabric 2 are polyester nonwoven fabrics made by hydroentangling process. The bottom is coated with acrylic adhesive and the surface is treated with anti-ultraviolet treatment. The ultraviolet blocking rate is ≥90% and the weather resistance meets the GB / T 14576-2020 standard.

[0021] 2. The sponge structure layer 2 is made of polyurethane closed-cell foam with a density of 40kg / m³ and a thickness of 3.0mm. It is bonded to the bonding fabric through a hot-pressing process at a temperature of 150℃±5℃ and a pressure of 0.5MPa. At the same time, nano-silica (3wt%) is added, and the flame retardant performance reaches UL94 V-0 level. It has excellent heat insulation, sound insulation, sound absorption and vibration reduction effects.

[0022] 3. Pressure-sensitive silicone layer 4 is made of polyurethane pressure-sensitive adhesive with a coating thickness of 0.2mm. The surface has a hemispherical micro-protrusion structure with a height of 20μm and a spacing of 0.8mm. It is formed by photolithography and has a temperature resistance range of -50℃ to 150℃. With its excellent adhesion, water resistance and chemical resistance, polyurethane pressure-sensitive adhesive can maintain a stable adhesion effect in complex and changing environments and is not prone to bubbles or peeling.

[0023] 4. The PE release film is 50μm thick, with a corona-treated surface and a surface resistance of ≤10^8Ω. The edges are pre-cut with laser lines to a depth of 15μm for easy peeling during construction. It has excellent low-temperature resistance and is suitable for bonding to complex curved surfaces of car windows (including sunroofs). It has high rigidity, tear resistance, and resistance to environmental stress cracking, ensuring long-term reliability. The surface is optimized with anti-static and anti-scratch processes to avoid static electricity or scratches during bonding.

[0024] Example 2: Implementation of Enhanced Structure

[0025] The following optimizations were made based on Example 1:

[0026] 1. Reinforcing fiber layer:

[0027] • An aramid fiber layer with a weight of 20 g / m² and a warp and weft density of 12 × 12 threads / cm is added between the bonding fabric 1 and the sponge structure layer 2.

[0028] • Tensile strength increased by 50% (GB / T 3923.1-2013), tear resistance reaches 35N / mm.

[0029] 2. Gradient density sponge layer:

[0030] The sponge structure layer 2 adopts a gradient density design. The upper layer (near the adhesive fabric side) has a density of 50kg / m³ to enhance support; the lower layer (near the adhesive layer side) has a density of 30kg / m³ to optimize sound insulation performance (noise reduction coefficient NRC≥0.7).

[0031] Example 3: Implementation of Process Optimization

[0032] 1. Composite process:

[0033] • A continuous roller pressing composite process is adopted, with a speed of 5m / min, a pressure of 0.8MPa, and a temperature of 160℃.

[0034] • After lamination, UV curing treatment (energy 800mJ / cm²) is performed to improve the interlayer bonding strength.

[0035] 2. Performance test data:

[0036] • Thermal insulation performance: Under 1000W / m² irradiation, the interior temperature is reduced by 15.3℃ compared to blank glass (ISO9869-1).

[0037] • Weight: 1.2kg / m², a 68% reduction in weight compared to traditional glass skylights.

[0038] • Durability: No delamination or bubbles after 100 cycles of hot and cold cycling from -40℃ to 120℃.

[0039] The working principle of the above embodiments is as follows:

[0040] (1) Heat insulation mechanism: the closed-cell foam of the sponge structure layer 2 blocks heat conduction through low thermal conductivity, and the reflective layer of the adhesive fabric (optional aluminum plating) reflects infrared rays with a reflectivity ≥85%.

[0041] (2) Adhesion mechanism: the micro-protrusion structure of the pressure-sensitive silicone layer 4 expels air during bonding to avoid air bubbles, and the molecular chains of polyurethane adhesive form a physical-chemical bond with the glass surface under pressure.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat insulation film structure for an automotive sunroof, characterized in that: It includes, from top to bottom, a bonding fabric (1), a sponge structure layer (2), a bonding fabric (3), a pressure-sensitive silicone layer (4), and a PE release film (5).

2. The automotive sunroof heat insulation film structure according to claim 1, characterized in that: The bonding fabric (1) is further divided into non-woven fabric and bottom bonding adhesive. The bonding adhesive is bonded to the top of the middle sponge structure layer (2). The bonding fabric (1) and the bonding fabric (3) are made of soft spunlace non-woven fabric with a thickness of 0.5-2.5mm.

3. The automotive sunroof heat insulation film structure according to claim 1, characterized in that: The polyurethane in the sponge structure layer (2) provides heat insulation, sound insulation, sound absorption and vibration reduction. Polyurethane is a closed-cell foam structure with a low thermal conductivity of ≤0.025 W / (m·K), which can effectively block heat conduction and is suitable for temperature stability control under temperature difference environment.

4. The automotive sunroof heat insulation film structure according to claim 1, characterized in that: The thickness of the pressure-sensitive silicone layer (4) is 0.1-0.3mm, the initial adhesion force is ≥1N / 35mm, the temperature resistance range is -50℃ to 150℃, and the surface of the adhesive layer is provided with a micro-protrusion structure to enhance the adhesion and air release.

5. The automotive sunroof heat insulation film structure according to claim 1, characterized in that: The thickness of the PE release film (5) is 12-80μm, the surface resistance is ≤10^9Ω, and the edge is provided with pre-cut lines to facilitate peeling during construction.

6. The automotive sunroof heat insulation film structure according to claim 1, characterized in that: A reinforcing fiber layer is provided between the bonding fabric (1) and the sponge structure layer (2) to improve the tensile strength of the overall structure.

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