PET-aluminum foil composite soundproof material

Abstract

The application discloses a PET-aluminum foil composite sound insulation material, and belongs to the technical field of sound insulation materials, which comprises, in sequence, a first PET non-woven fabric layer, an aluminum foil layer, a second PET non-woven fabric layer, a PET fiber sound absorption layer and a flame-retardant hot melt adhesive net film, wherein the flame-retardant hot melt adhesive net film is arranged between adjacent layers and is used for bonding the layers into an integrated whole under hot pressing conditions. Through the design of gradient functional layers, the outer PET non-woven fabric provides wear-resistant, tear-resistant and ultraviolet aging-resistant protection, the aluminum foil layer realizes efficient sound insulation, heat insulation and moisture resistance, and the porous PET layer absorbs medium and low frequency noise by using the porous structure. The hot melt adhesive net film is used for hot pressing and compounding of the layers, the combination is firm and resistant to high and low temperature impact, and the flame retardance and mechanical properties are improved. The application has the characteristics of excellent sound insulation performance, environmental protection, flame retardance, strong weather resistance and convenient construction, and can be widely applied to the fields of building partition walls, vehicle interiors and industrial equipment noise reduction.

Description

Technical Field

[0001] This invention belongs to the field of sound insulation materials technology, specifically, it relates to a PET aluminum foil composite sound insulation material. Background Technology

[0002] With the acceleration of urbanization and the increasing demands for comfort in working and living environments across various industries, noise pollution control has become a major concern. In the construction sector (such as cinemas, recording studios, and home soundproofing) and the transportation sector (such as automobile and high-speed rail interiors), the need for materials that combine high-efficiency sound insulation, lightweight design, and environmental friendliness is becoming increasingly urgent.

[0003] Currently, mainstream sound insulation materials on the market are mainly divided into two categories: one is sound insulation felt with rubber, soft PVC, or asphalt as the base material (usually filled with heavy metal fillers such as barium sulfate to increase surface density), which blocks sound transmission through the "mass law"; the other is sound-absorbing cotton with polyurethane or PET fiber as the base material, used to dissipate sound wave energy. The latter has the advantage of being lightweight and is developing rapidly. Meanwhile, aluminum foil, due to its excellent sound insulation, heat insulation, and anti-radiation properties, is widely used as the surface layer of sound insulation materials. The industry is combining these two materials, for example, by laminating aluminum foil onto PET sound insulation cotton, resulting in a composite material with improved overall performance.

[0004] However, this composite of sound insulation cotton and aluminum foil has the following drawbacks: 1. Weak peel strength, the two are easy to peel off as the usage time increases; 2. There is still room for improvement in sound insulation performance; 3. There is a risk of flammability when used in high-temperature environments. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a PET aluminum foil composite sound insulation material.

[0006] The objective of this invention can be achieved through the following technical solutions: A PET aluminum foil composite sound insulation material, comprising the following sequentially stacked components: First PET nonwoven fabric layer; Aluminum foil layer; Second PET nonwoven fabric layer; PET fiber sound-absorbing layer; and Flame-retardant hot melt adhesive film is disposed between adjacent layers to bond the layers together under hot pressing conditions.

[0007] Furthermore, the basis weight of the first PET nonwoven fabric layer and the second PET nonwoven fabric layer is 50-200 g / m². 2Its fiber fineness is 1.5-6 denier and its thickness is 0.3-1.5 mm. The first PET nonwoven fabric layer serves as the outer layer and has wear-resistant, UV-resistant and tear-resistant functions to protect the inner aluminum foil layer. The second PET nonwoven fabric layer serves as the intermediate transition reinforcement layer to improve the bonding strength between the aluminum foil layer and the porous PET layer, forming a sandwich structure of "nonwoven fabric-aluminum foil-nonwoven fabric".

[0008] Furthermore, the aluminum foil layer has a thickness of 0.01-0.05 mm. The aluminum foil layer is tightly bonded between the first PET nonwoven fabric layer and the second PET nonwoven fabric layer.

[0009] Furthermore, the PET fiber sound-absorbing layer is a polyester fiber sound-absorbing cotton with a thickness of 3-20 mm and a density of 30-80 kg / m³. 3 The porosity is 80%-95%.

[0010] Furthermore, the flame-retardant hot melt adhesive film comprises the following raw materials in parts by weight: 70-80 parts of polyethylene vinyl acetate, 10-15 parts of flame-retardant additives, 8-10 parts of terpene resin, 58 parts of paraffin wax, 23 parts of antioxidant, 2-3 parts of inorganic filler, and 0.2-0.3 parts of initiator.

[0011] Furthermore, the antioxidant is selected from one of antioxidant 1010, antioxidant BHT and antioxidant 264; the inorganic filler is selected from one of talc, kaolin and nano calcium carbonate; and the initiator is selected from one of di-tert-butyl peroxide (DTBP) and dicumyl peroxide (DCP).

[0012] Furthermore, the molecular structure of the flame retardant additive is shown below: .

[0013] From a molecular structure perspective, the flame retardant additive contains a central CN heterocycle and unsaturated carbon-carbon double bonds at the ends, arranged in a dendritic pattern around the CN heterocycle. The CN heterocycle belongs to the N-series flame retardant components, giving the flame retardant additive halogen-free, environmentally friendly, and highly efficient flame retardant properties. When added to a hot melt adhesive web, it imparts safe and environmentally friendly flame retardant performance to the composite sound insulation material. The unsaturated carbon-carbon double bonds at the ends can cross-link with the adhesive web matrix (polyvinyl acetate, terpene resin) under the action of a trace initiator, forming a micro-level cross-linked network structure. This not only improves the flame retardant additive's resistance to migration and exudation, ensuring a long-lasting flame retardant effect, but also enhances the mechanical strength of the adhesive web, thereby improving the mechanical strength of the composite sound insulation material.

[0014] Furthermore, the flame retardant additive is prepared by the following method: At room temperature, melamine, NHS (N-hydroxysuccinimide), EDC·HCl (1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride) and DMF (N,N-dimethylformamide) were added to a flask and stirred until homogeneous. Nitrogen gas was then introduced, and acrylic acid was added dropwise after 10 minutes. The reaction was carried out under nitrogen protection and stirred at room temperature for 6-8 hours. After the reaction was completed, a large amount of deionized water was added, and a solid product was precipitated. The product was filtered, washed 2-3 times with deionized water, and dried to obtain the flame retardant additive.

[0015] Furthermore, the molar ratio of melamine to acrylic acid is 1:4-5.

[0016] Furthermore, the overall structure is formed through a segmented temperature-controlled hot pressing composite process, with a hot pressing temperature of 130-180℃ and a hot pressing pressure of 0.5-3.0 MPa.

[0017] The beneficial effects of this invention are: 1. Excellent durability and protection: By tightly sandwiching the aluminum foil layer between two layers of PET nonwoven fabric, the high reflectivity of the aluminum foil is used to achieve sound insulation, heat insulation and moisture protection, while the outer PET nonwoven fabric provides excellent wear resistance, tear resistance and UV aging resistance.

[0018] 2. Excellent Functional Integration and Acoustic Performance: This invention employs a multi-layered gradient structure combining "isolation" and "absorption." The aluminum foil layer and its adjacent high-density nonwoven fabric layer primarily isolate mid-to-high frequency noise, while the PET fiber sound-absorbing layer utilizes its porous structure to absorb sound wave energy, particularly effective at absorbing low-frequency noise. The synergistic effect of both significantly improves the overall sound insulation (transmission loss) compared to a single material.

[0019] 3. Strong interlayer bonding, adaptable to complex environments: The use of flame-retardant hot melt adhesive web for hot-press lamination avoids the problem of liquid adhesive penetrating and clogging the porous structure. After melting, the adhesive web forms a uniform mesh of bonding points, providing sufficient peel strength and maintaining stable toughness over a wide temperature range, effectively preventing delamination under high and low temperature impacts. In addition, the flame-retardant hot melt adhesive web can effectively improve the flame retardancy and mechanical properties of the composite material, thereby expanding the application range and service life of the composite material.

[0020] 4. Environmentally friendly and easy to process: PET material is recyclable and reusable, and the lamination process does not require organic solvents, meeting environmental protection requirements. The overall material has good flexibility, is easy to cut and install, and can be applied to curved or irregular surfaces. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] Preparation of flame retardant additives: At room temperature, 12.6 g of melamine, 11.5 g of NHS, 19.2 g of EDC·HCl and 120 mL of DMF were added to a flask and stirred until homogeneous. Nitrogen gas was then introduced, and after 10 min, 28.8 g of acrylic acid was added dropwise. The reaction was carried out under nitrogen protection and stirred at room temperature for 6 h. After the reaction was completed, a large amount of deionized water was added, and a solid product was precipitated. The product was filtered, washed 2-3 times with deionized water, and dried to obtain the flame retardant additive.

[0024] Example 2

[0025] Preparation of flame-retardant hot melt adhesive web: 70 parts of polyethylene vinyl acetate, 10 parts of the flame retardant additive prepared in Example 1, 8 parts of terpene resin, 5 parts of paraffin wax, 2 parts of antioxidant 1010, 2 parts of talc powder, and 0.2 parts of DTBP were mixed and melted, and then pumped into a spinneret. Under the traction of airflow (airflow speed of 60 m / min), the spinneret spun the material onto a conveyor belt at a preset speed of 15 m / min. After cooling and crystallization, a flame retardant hot melt adhesive web was obtained.

[0026] Example 3

[0027] Preparation of flame-retardant hot melt adhesive web: 75 parts of polyethylene vinyl acetate, 13 parts of the flame retardant additive prepared in Example 1, 9 parts of terpene resin, 6 parts of paraffin wax, 2.5 parts of antioxidant BHT, 2.6 parts of kaolin, and 0.3 parts of DTBP were mixed and melted, and then pumped into a spinneret. Under the traction of airflow (airflow speed of 60 m / min), the spinneret spun the material onto a conveyor belt at a preset speed of 15 m / min. After cooling and crystallization, a flame retardant hot melt adhesive web was obtained.

[0028] Example 4

[0029] Preparation of flame-retardant hot melt adhesive web: 80 parts of polyethylene vinyl acetate, 15 parts of the flame retardant additive prepared in Example 1, 10 parts of terpene resin, 8 parts of paraffin wax, 3 parts of antioxidant 264, 3 parts of nano calcium carbonate, and 0.3 parts of DCP were mixed and melted, and then pumped into a spinneret. Under the traction of airflow (airflow speed of 60 m / min), the spinneret spun the material onto a conveyor belt at a preset speed of 15 m / min. After cooling and crystallization, a flame retardant hot melt adhesive web was obtained.

[0030] Comparative Example 1 Flame-retardant hot melt adhesive film obtained by using melamine as a flame-retardant additive in hot melt adhesive film according to the formulation and process of Example 2.

[0031] Comparative Example 2 Compared to Example 2, the hot melt adhesive film obtained without adding flame retardant additives.

[0032] The hot melt adhesive webs obtained in Examples 2-4 and Comparative Examples 1-2 were examined for their 180° peel strength against PET / aluminum and PET / stainless steel at 160°C, 0.30 MPa, and 120 s hot pressing. Furthermore, the tensile strength and oxygen index of each hot melt adhesive web were tested at room temperature. Specific test results are shown in Table 1 below: Table 1

[0033] As can be seen from the test data in Table 1 above, the hot melt adhesive film obtained in Examples 2-4 has high peel strength, mechanical strength and flame retardant properties; combined with the data of the comparative examples, it can be seen that the addition of flame retardant additives can effectively improve its flame retardant properties and mechanical strength.

[0034] Example 5

[0035] Preparation of PET aluminum foil composite sound insulation material: The first PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Example 2, the aluminum foil layer, the flame-retardant hot melt adhesive web film prepared in Example 2, the second PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Example 2, and the PET fiber sound-absorbing layer are sequentially stacked and formed by segmented temperature-controlled hot pressing composite process to obtain PET aluminum foil composite sound insulation material.

[0036] Example 6

[0037] Preparation of PET aluminum foil composite sound insulation material: The first PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Example 3, the aluminum foil layer, the flame-retardant hot melt adhesive web film prepared in Example 3, the second PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Example 3, and the PET fiber sound-absorbing layer are sequentially stacked and formed by segmented temperature-controlled hot pressing composite process to obtain PET aluminum foil composite sound insulation material.

[0038] Example 7

[0039] Preparation of PET aluminum foil composite sound insulation material: The first PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Example 4, the aluminum foil layer, the flame-retardant hot melt adhesive web film prepared in Example 4, the second PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Example 4, and the PET fiber sound-absorbing layer are sequentially stacked and formed by segmented temperature-controlled hot pressing composite process to obtain PET aluminum foil composite sound insulation material.

[0040] Comparative Example 3 Preparation of PET aluminum foil composite sound insulation material: The first PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Comparative Example 1, the aluminum foil layer, the flame-retardant hot melt adhesive web film prepared in Comparative Example 1, the second PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Comparative Example 1, and the PET fiber sound-absorbing layer are sequentially stacked and formed by segmented temperature-controlled hot pressing composite process to obtain PET aluminum foil composite sound insulation material.

[0041] Comparative Example 4 Preparation of PET aluminum foil composite sound insulation material: The first PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Comparative Example 2, the aluminum foil layer, the flame-retardant hot melt adhesive web film prepared in Comparative Example 2, the second PET nonwoven fabric layer, the flame-retardant hot melt adhesive web film prepared in Comparative Example 2, and the PET fiber sound-absorbing layer are sequentially stacked and formed by segmented temperature-controlled hot pressing composite process to obtain PET aluminum foil composite sound insulation material.

[0042] The overall noise reduction effect of the compressors in Examples 5-7 and Comparative Examples 3-4, i.e. the sound insulation effect of the composite sound insulation material, is shown in Table 2 below: Table 2

[0043] As can be seen from the data in Table 2 above, the composite sound insulation materials in Examples 5-7 all have a good overall noise reduction effect on the compressor, that is, they have a good sound insulation effect.

[0044] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A PET aluminum foil composite sound insulation material, characterized in that, Including those set up in a stacked manner: First PET nonwoven fabric layer; Aluminum foil layer; Second PET nonwoven fabric layer; PET fiber sound-absorbing layer; and Flame-retardant hot melt adhesive film is disposed between adjacent layers to bond the layers together under hot pressing conditions.

2. The PET aluminum foil composite sound insulation material according to claim 1, characterized in that, The basis weight of the first PET nonwoven fabric layer and the second PET nonwoven fabric layer is 50-200 g / m². 2 Its fiber fineness is 1.5-6 denier and its thickness is 0.3-1.5 mm.

3. The PET aluminum foil composite sound insulation material according to claim 1, characterized in that, The thickness of the aluminum foil layer is 0.01-0.05 mm.

4. The PET aluminum foil composite sound insulation material according to claim 1, characterized in that, The PET fiber sound-absorbing layer is a polyester fiber sound-absorbing cotton with a thickness of 3-20mm and a density of 30-80kg / m³. 3 The porosity is 80%-95%.

5. The PET aluminum foil composite sound insulation material according to claim 1, characterized in that, The flame-retardant hot melt adhesive film comprises the following raw materials in parts by weight: 70-80 parts of polyethylene vinyl acetate, 10-15 parts of flame retardant additives, 8-10 parts of terpene resin, 58 parts of paraffin wax, 23 parts of antioxidant, 2-3 parts of inorganic filler, and 0.2-0.3 parts of initiator.

6. The PET aluminum foil composite sound insulation material according to claim 5, characterized in that, The antioxidant is selected from one of antioxidant 1010, antioxidant BHT and antioxidant 264; the inorganic filler is selected from one of talc, kaolin and nano calcium carbonate; the initiator is selected from one of di-tert-butyl peroxide and dicumyl peroxide.

7. The PET aluminum foil composite sound insulation material according to claim 5, characterized in that, The molecular structure of the flame retardant additive is shown below: 。 8. The PET aluminum foil composite sound insulation material according to claim 7, characterized in that, The flame retardant additive is prepared by the following method: Melamine, NHS, EDC·HCl and DMF were added to a flask at room temperature and stirred until homogeneous. Nitrogen gas was then introduced, and acrylic acid was added dropwise after 10 minutes. The reaction was carried out under nitrogen protection and stirred at room temperature for 6-8 hours. After post-reaction processing, the flame retardant additive was obtained.

9. The PET aluminum foil composite sound insulation material according to claim 1, characterized in that, The overall structure is formed by a segmented temperature-controlled hot pressing composite process, with a hot pressing temperature of 130-180℃ and a hot pressing pressure of 0.5-3.0 MPa.

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