Aluminum foil composite material structure for automobile airbag gas generator

Abstract

The present invention relates to an aluminum foil composite material structure for an automobile safety airbag gas generator, comprising a PET film and an aluminum foil made of pure aluminum, wherein the PET film is bonded to the aluminum foil via a first acrylic adhesive layer. A release paper layer is provided on the side of the aluminum foil away from the PET film, and an adhesive layer is provided between the release paper layer and the aluminum foil. The aluminum foil composite material structure has higher holding power and tensile strength, and can remain attached to the inner wall of the gas generator when the gas generator acts in a high temperature environment, and will not be torn and run out of the generator; the holding power and tensile strength of the aluminum foil are improved by adding the PET coating.

Description

Technical Field

[0001] The invention relates to the technical field of safety airbags, and in particular to an aluminum foil composite material structure for a gas generator of an automobile safety airbag. Background Art

[0002] Airbags are inflatable soft bags installed at different locations in a car. When a collision occurs, they can be instantly inflated and popped out, acting as a buffer between the occupants and the car body, protecting the occupants and reducing the degree of injury. They are an important part of the passive safety equipment of the car. The gas generator of the airbag is the core component of the airbag system. Its main components include igniter, explosive powder, gas generator, filter, sealed bursting membrane and outer shell. The gas generator in the airbag usually contains chemical substances such as sodium azide (NaN3) or ammonium nitrate (NH4NO3). When the impact degree of the vehicle meets its preset detonation value, a large amount of gas will be generated in a very short time, filling the entire airbag. The sealed bursting membrane usually uses aluminum foil as the sealing device of the automobile airbag gas generator, which is pasted on the exhaust hole on the inner wall of the gas generator shell. Its function is to block the air and ensure that the agent in the gas generator is not damp or oxidized, so that the gas generator can reach a longer service life. When the airbag is activated, the agent in the gas generator burns to generate high-temperature and high-pressure gas flow, which breaks through the aluminum foil at the exhaust hole and is released into the airbag to protect the occupants. The aluminum foil of the existing gas generator is easily torn and rushed out of the gas generator, causing accidents such as burning the airbag or even burning the car occupants.

[0003] With the development of the industry, airbags, as a protective device for car occupants, have higher requirements for product performance and safety. Although the Chinese patent application with publication number CN205364714U discloses a new type of tropical aluminum, including an aluminum foil layer, a PET layer, a PVC layer, a printing primer layer, an ink layer, an adhesive layer and a protective layer, the aluminum foil has problems such as complex structure, high cost and environmental pollution, and is difficult to be widely promoted and applied in airbags. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an aluminum foil composite material structure for an automobile airbag gas generator in response to the above-mentioned technical deficiencies. The aluminum foil composite PET film made of pure aluminum material is used to solve the problem that the aluminum foil is easily torn and rushes out of the gas generator, causing damage to the airbag or even scalding the car occupants.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an aluminum foil composite material structure for an automobile airbag gas generator, comprising a PET film and an aluminum foil made of pure aluminum, the PET film is bonded to the aluminum foil through a first acrylic adhesive layer, a release paper layer is provided on the side of the aluminum foil away from the PET film, and an adhesive layer is provided between the release paper layer and the aluminum foil.

[0006] To further optimize the technical solution, the overall thickness of the aluminum foil composite material structure is 0.2 mm to 0.3 mm.

[0007] To further optimize the technical solution, the PET film is a biaxially stretched polyester film, and the thickness of the PET film is 0.05 mm to 0.08 mm.

[0008] To further optimize the technical solution, the first acrylic adhesive layer and the second acrylic adhesive layer are respectively oily two-component acrylic ester adhesive layers, and their respective thicknesses are 0.04 mm to 0.06 mm.

[0009] To further optimize the technical solution, the release paper layer is a single silicone oil paper, and the bonding layer between the release paper layer and the aluminum foil is a second acrylic adhesive layer.

[0010] Compared with the prior art, the present invention has the following advantages: 1. The aluminum foil composite material structure has higher holding force and tensile strength, and can remain adhered to the inner wall of the gas generator when the gas generator is operating in a high temperature environment, and will not be torn and run out of the generator; 2. The holding force and tensile strength of the aluminum foil are improved by adding a PET coating; 3. The aluminum foil composite material structure is applied to the gas generator to effectively prevent the torn aluminum foil from being brought out when the airflow rushes out; 4. Polyvinyl chloride (PVC) has poor stability to light and heat. It will decompose to produce hydrogen chloride at temperatures above 100°C or after long-term exposure to sunlight, and further automatically catalytically decompose, causing discoloration, and the physical and mechanical properties will also decline rapidly. The present invention removes PVC to ensure aluminum foil, and has the characteristics of environmental protection and good thermal stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a layered structure of an aluminum foil composite material structure for automobile airbag gas generator;

[0012] In the figure: 1. PET film; 2. Aluminum foil; 3. First acrylic adhesive layer; 4. Release paper layer; 5. Second acrylic adhesive layer. DETAILED DESCRIPTION

[0013] The technical scheme in the embodiment of the present invention is described clearly and completely below in conjunction with the accompanying drawings in the embodiment of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below. Embodiment 1

[0014] Combination Figure 1 As shown, an aluminum foil composite material structure for an automobile airbag gas generator includes a PET film 1, an aluminum foil 2 made of pure aluminum, and a release paper layer 4. The PET film 1 is bonded to the aluminum foil 2 through a first acrylic adhesive layer 3. The thickness of the PET film 1 is 0.05 mm, and the PET film 1 is a biaxially stretched polyester film. The side of the aluminum foil 2 away from the PET film 1 is a release paper layer 4, which is a double-plastic single-silicone oil paper. The release paper layer 4 and the aluminum foil 2 are bonded by a second acrylic adhesive layer 5.

[0015] The first acrylic adhesive layer 3 and the second acrylic adhesive layer 5 are respectively oily two-component acrylic adhesive layers, and the thickness of each of them is 0.04 mm. The overall thickness of the aluminum foil composite material structure of this embodiment is controlled to be 0.2 mm.

[0016] The aluminum foil composite material structure has higher holding force and tensile strength. It can remain adhered to the inner wall of the gas generator when the gas generator is operating in a high temperature environment and will hardly escape from the generator due to tearing. It also has the characteristic of good thermal stability under high temperature conditions of the gas generator.

[0017] Taking the PAB generator as an example, a comparative test between the aluminum foil composite material of the invention structure and the traditional aluminum foil was conducted. When the generator is subjected to high temperature, the aluminum foil fragments that escape from the shell are only a small part of the shell outlet hole size and the hole periphery. The total weight of the particles generated by the detonation of the airbag is about 800 mg, and the weight of the particles that escape from the outlet hole is only about 30 mg. Among the particles that escape, there are only a small amount of aluminum foil fragments, and most of the rest are the particles of the agent combustion. Most of the other particles will remain in the shell; when the generator is subjected to high temperature, the aluminum foil fragments and the particles of the agent combustion almost all escape from the inside of the shell, and a small amount of aluminum foil blocks the original outlet hole. The weight of the particles that escape is about 600 mg, and the size of the aluminum foil fragments that escape is also large. The white and bright particles are traditional aluminum foil fragments, and the black particles are the residues of the agent combustion. The large amount of particles that escape can easily cause damage to the airbag in the airbag module, and even cause harm to the occupants. Embodiment 2

[0018] The difference from the first embodiment is that the PET film 1 is a biaxially oriented polyester film, and the thickness of the PET film 1 is 0.08 mm.

[0019] The first acrylic adhesive layer 3 and the second acrylic adhesive layer 5 are respectively oily two-component acrylic adhesive layers, each of which has a thickness of 0.06 mm. The overall thickness of the aluminum foil composite material structure is controlled at 0.3 mm.

[0020] By further increasing the overall thickness, the overall structural strength of the aluminum foil composite material is further improved, the overall physical and mechanical properties are improved, and the tensile strength after tearing is improved. By further comparing the amount of aluminum foil running out, the amount of aluminum foil fragments running out after the improvement is significantly reduced.

[0021] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. An aluminum foil composite material structure for an automobile airbag gas generator, characterized in that: The invention comprises a PET film (1) and an aluminum foil (2) made of pure aluminum, wherein the PET film (1) is bonded to the aluminum foil (2) via a first acrylic adhesive layer (3), a release paper layer (4) is provided on a side of the aluminum foil (2) away from the PET film (1), and an adhesive layer is provided between the release paper layer (4) and the aluminum foil (2).

2. The aluminum foil composite material structure for automobile airbag gas generator according to claim 1, characterized in that: The overall thickness of the aluminum foil composite material structure is 0.2 mm to 0.3 mm.

3. The aluminum foil composite material structure for automobile airbag gas generator according to claim 1, characterized in that: The PET film (1) is a biaxially stretched polyester film, and the thickness of the PET film (1) is 0.05 mm to 0.08 mm.

4. The aluminum foil composite material structure for automobile airbag gas generator according to any one of claims 1 to 3, characterized in that: The first acrylic adhesive layer (3) and the second acrylic adhesive layer (5) are respectively oily two-component acrylic ester adhesive layers, and each has a thickness of 0.04 mm to 0.06 mm.

5. The aluminum foil composite material structure for automobile airbag gas generator according to claim 1, characterized in that: The release paper layer (4) is a single silicone oil paper, and the bonding layer between the release paper layer (4) and the aluminum foil (2) is a second acrylic adhesive layer (5).

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