Environment-friendly composite hose with aluminized PE as middle layer and preparation method of environment-friendly composite hose

Abstract

The invention discloses an environment-friendly composite hose with aluminized PE as a middle layer and a preparation method of the environment-friendly composite hose, and relates to the technical field of layered composite hoses. The composite hose sequentially comprises an inner layer, a middle layer and an outer layer from inside to outside, the outer layer is an anti-aging layer, and the anti-aging layer is prepared from, by mass, 40-65 parts of waterborne acrylic resin, 15-35 parts of color paste, 1-3 parts of dispersing agent, 0.5-2 parts of defoaming agent, 10-25 parts of deionized water and 1-5 parts of anti-ultraviolet aging agent. The degradable polyester material is used as the inner layer, and the regenerated polyester material is used as the outer layer, so that the petroleum resource dependence and environmental pollution risk are greatly reduced, the good barrier property and mechanical property are maintained, meanwhile, biodegradation is easier, and the ecological footprint is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of layered composite hoses, and in particular to an environmentally friendly composite hose with aluminum-plated PE as an intermediate layer and a preparation method thereof. Background Art

[0002] With the increasing awareness of environmental protection, the requirements for the environmental performance of packaging materials are becoming increasingly stringent. Composite hoses, as a common packaging material, are widely used in food, cosmetics, medicine and other fields. However, traditional composite hoses have some environmental issues.

[0003] Traditional composite hoses are primarily made from a combination of various plastic materials, such as polyethylene, polyvinyl chloride, polypropylene, and polyester. The production of these materials consumes significant amounts of petroleum resources and is difficult to degrade, causing significant environmental pollution. Furthermore, auxiliary materials such as adhesives and inks used in the production of traditional composite hoses contain hazardous substances, such as organic solvents and heavy metals. These substances can migrate into products such as food packaging, posing potential risks to human health.

[0004] To address these issues, researchers have recently begun exploring methods for producing environmentally friendly composite hoses. One promising solution is an environmentally friendly composite hose with an aluminized polyethylene intermediate layer. This composite hose maintains excellent barrier and mechanical properties while reducing environmental pollution.

[0005] Aluminized polyethylene has excellent barrier and reflective properties, effectively preventing the penetration of substances such as oxygen and water vapor, thereby extending the shelf life of the product. Furthermore, the use of aluminized polyethylene can reduce the thickness of the composite hose, thereby reducing the overall amount of composite hose material used, helping to reduce resource consumption and waste generation.

[0006] However, existing composite hoses with aluminized polyethylene as the middle layer still have some environmental shortcomings. For example, the outer layer is typically made of traditional polyester, whose production still relies on petroleum resources and is difficult to degrade. Furthermore, auxiliary materials such as adhesives and inks used in the production of existing composite hoses also fail to fully meet environmental requirements.

[0007] Therefore, developing a new environmentally friendly composite hose with an aluminum-plated polyethylene layer as the middle layer and its preparation method, and improving environmental performance by replacing traditional auxiliary materials with environmentally friendly auxiliary materials, are of great significance for promoting the development of the packaging industry towards environmental protection. Summary of the Invention

[0008] This invention aims to provide an environmentally friendly composite hose with an aluminized polyethylene layer as its middle layer and its preparation method. By using biodegradable polyester, recycled polyester, and environmentally friendly auxiliary materials, and further adding a special UV-resistant anti-aging agent as a key component, the outer layer of the hose containing the biodegradable environmentally friendly auxiliary materials is protected from degradation caused by ultraviolet radiation. This improves the environmental performance of the composite hose while maintaining good barrier and mechanical properties.

[0009] To achieve the above object, the technical solution adopted by the present invention is: an environmentally friendly composite hose with aluminized PE as the middle layer, which comprises, from the inside to the outside: an inner layer of a degradable polyester material layer; an intermediate layer of an aluminized polyethylene film layer, the aluminized polyethylene film layer comprising an aluminum layer and a polyethylene layer, with the aluminum layer facing the inner layer; an outer layer of an anti-aging layer;

[0010] The anti-aging layer includes an anti-ultraviolet aging agent having a structure shown in Formula 1,

[0011]

[0012] The R1 is selected from the group consisting of: methyl, ethyl, tert-butyl, and methoxy.

[0013] Furthermore, the anti-aging layer is composed of the following components by mass: 40-65 parts of water-based acrylic resin, 15-35 parts of color paste, 1-3 parts of dispersant, 0.5-2 parts of defoaming agent, 10-25 parts of deionized water, and 1-5 parts of the above-mentioned anti-ultraviolet aging agent;

[0014] Furthermore, the solid content of the water-based acrylic resin is ≥50%, and the acid value is 30-60 mg (KOH / g) of pure solid.

[0015] Furthermore, the color paste is selected from any one of: phthalocyanine green G, phthalocyanine blue BGS, permanent red F4R, and titanium dioxide R-706.

[0016] Furthermore, the color paste contains a heavy metal content (the total amount of lead, cadmium, mercury, and hexavalent chromium) of ≤20 ppm, a polycyclic aromatic hydrocarbons (PAHs) content of ≤1 mg / kg, and does not contain phthalate plasticizers.

[0017] Furthermore, the dispersant is specifically Nopco 5040 dispersant; and the defoaming agent is specifically sodium dodecyl sulfate.

[0018] Furthermore, the anti-ultraviolet aging agent is selected from any one of the compounds shown in the following structures:

[0019]

[0020]

[0021] Furthermore, the preparation method of the anti-aging layer is: mixing and stirring the water-based acrylic resin, color paste, dispersant, defoaming agent, deionized water and anti-ultraviolet aging agent to form the anti-aging layer slurry; applying the anti-aging layer slurry on the surface of the middle layer, drying and curing at 60-80°C to obtain the anti-aging layer.

[0022] Furthermore, the material used for the degradable polyester material layer is polylactic acid.

[0023] Furthermore, the material used for the aluminized polyethylene film layer is a polyethylene aluminized film, the thickness of the aluminum layer is 20-40 nm, and the thickness of the polyethylene layer is 10-30 μm.

[0024] The present invention also provides a method for preparing the above-mentioned environmentally friendly composite hose with aluminum-plated PE as the middle layer, comprising the following steps:

[0025] S1. The anti-aging layer slurry is applied to the surface of the polyethylene layer and dried and cured at 60-80 ° C to obtain a prefabricated composite film;

[0026] S2. The surface of the degradable polyester material layer is coated with an adhesive and bonded to the aluminum layer of the aluminized polyethylene film layer to obtain a three-layer composite structure;

[0027] S3. Curing the three-layer composite structure obtained in S2 at 40-60°C for 24-48 hours to obtain an environmentally friendly composite hose with aluminum-plated PE as the middle layer.

[0028] Furthermore, the bonding of S2 is completed at a pressure of 5-10 MPa and a temperature of 50-70°C.

[0029] Furthermore, the three-layer composite structure after solidification in S3 is cut, rolled, and heat-sealed to form a hose, with the heat-sealing temperature being 80-100° C. and the heat-sealing pressure being 0.3-0.6 MPa.

[0030] Furthermore, the adhesive is a water-based polyurethane adhesive.

[0031] In the environmentally friendly composite hose disclosed in the present invention, the anti-ultraviolet aging agent is a key component, mainly used to protect the outer layer of the hose from degradation caused by ultraviolet radiation. This aging agent plays a role in light stabilization and anti-oxidation in the composite hose, thereby extending the life of the material and maintaining its environmental performance. The anti-ultraviolet aging agent structure contains a large conjugated system, a polyhydroxy structure, and a cyano structure. The large conjugated system is the core of the aging agent. It absorbs ultraviolet light (UV-A and UV-B bands, approximately 280-400nm) through a wide range of π-π conjugated networks. When ultraviolet radiation irradiates the surface of the hose, the conjugated structure acts as an "energy absorber" to convert high-energy UV photons into low-energy heat or fluorescence and then release them, thereby preventing UV from directly attacking the polyester molecular chain and avoiding the breakage and cross-linking degradation of the polymer main chain. The multiple hydroxyl groups in the molecule provide free radical capture and hydrogen bond stabilization functions. When ultraviolet radiation triggers the material to produce free radicals, the hydroxyl groups adsorb these highly active free radicals through hydrogen bonding to form stable intermediates, interrupting the free radical chain reaction, which significantly slows down the oxidative degradation process. At the same time, the strong polarity of the hydroxyl group facilitates the formation of intermolecular hydrogen bonds, enhancing the dispersibility and thermal stability of the aging agent in the anti-aging layer. As a strong electron acceptor, the cyano group functions through a light quenching mechanism, capturing the energy of excited molecules and converting it into harmless vibrational energy or radiation through electron transfer or energy transfer processes. The synergistic effect of these structural elements (rather than their isolated functions) is the key to the high efficiency of this aging agent: the large conjugated structure acts as the main absorber, the polyhydroxy structure provides an antioxidant buffer, and the cyano structure assists in quenching residual excited states.

[0032] The inner layer, middle layer and outer layer described in the present invention constitute a three-layer structure with a coordinated environmentally friendly design. The inner layer (degradable polyester layer) provides basic barrier properties and degradability, and is decomposed by microorganisms in the natural environment to reduce white pollution; the middle layer is in direct contact with the aluminum-plated surface to enhance the continuity of the barrier performance. The aluminum layer in the middle aluminum-plated PE film layer reflects ultraviolet light and blocks oxygen and water vapor, solving the problem of short shelf life of traditional hoses; the PE substrate provides flexibility and an adhesive interface, and the inward design of the aluminum layer can protect the contents of the inner layer from light degradation. At the same time, the PE substrate provides an adhesive basis for the outer layer. The outer anti-aging layer provides film-forming properties and weather resistance through water-based acrylic resin; the color paste achieves non-toxic coloring; the anti-UV aging agent absorbs UV through a large conjugated structure, uses hydroxyl groups to capture free radicals, and cyanide groups to quench excited states. The three work together to delay material aging.

[0033] The water-based acrylic resin described in the present invention has a high solid content (≥50%), which can ensure the density of the coating. At the same time, its acid value is in the range of 30-60 mg (KOH / g), which helps to regulate the adhesion, thereby effectively overcoming the problems of poor adhesion and easy peeling of recycled materials. Nopco 5040 dispersant can improve the dispersion uniformity of the color paste, avoiding color difference and local performance defects in the coating. Sodium dodecyl sulfate can be used to eliminate bubbles generated during the stirring process, prevent pinholes in the coating after curing, and ensure the barrier integrity of the coating. The anti-ultraviolet aging agent, through its formula 1 structure, combines light absorption and free radical capture to delay the degradation of the outer layer of the coating, solving the problem of the short life of the anti-aging layer due to poor UV tolerance.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. Significantly Improved Environmental Performance: By utilizing a biodegradable polyester material (such as polylactic acid) for the inner layer and a recycled polyester material for the outer layer, this invention significantly reduces dependence on petroleum resources and the risk of environmental pollution. Conventional technologies rely on non-biodegradable plastics, which are prone to causing white pollution. This design makes the hose more biodegradable, reducing its ecological footprint.

[0036] 2. Significantly enhanced UV resistance: By adding a highly effective UV inhibitor, this invention effectively slows the degradation of the material under UV radiation. While the outer layer of conventional hoses is susceptible to yellowing and cracking due to UV radiation, this invention's UV inhibitor utilizes light absorption and free radical capture mechanisms to protect the outer layer from damage, significantly extending the hose's service life while maintaining a stable appearance.

[0037] 3. Comprehensive Performance Synergistic Optimization: The coordinated design of the three-layer structure optimizes the overall performance of the hose. Conventional technologies separate the functionalities of each layer, which can lead to insufficient barrier performance or reduced mechanical strength. This design, combined with environmentally friendly materials, improves barrier performance, mechanical strength, and product durability while maintaining flexibility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of an environmentally friendly composite hose with aluminized PE as the middle layer according to the present invention;

[0039] 1 is the inner layer, 2 is the middle layer, and 3 is the outer layer.

[0040] Figure 2 For the anti-ultraviolet aging agent 1 of the present invention 1 HNMR spectrum. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0042] Synthesis example 1

[0043] Synthesis of UV-resistant aging agent 1:

[0044]

[0045] The first step: Under a nitrogen atmosphere, 30 g of raw material 1, 17.71 g of raw material 2, 18.13 g of anhydrous potassium carbonate, 2.27 g of tetrakis(triphenylphosphine)palladium and 330 g of a mixture of toluene, ethanol and aqueous solution in a volume ratio of 2:1:1 were added to the reaction system, heated to 95 ° C and refluxed for 10 hours, the heating was turned off, cooled to room temperature, and allowed to stand for separation. The aqueous phase was extracted twice with ethyl acetate, the organic phases were combined, the organic phases were dried over anhydrous magnesium sulfate, filtered, and dried, and silica gel column chromatography was performed using a mixture of petroleum ether and ethyl acetate as eluent, and dried to obtain 28.36 g of intermediate 1.

[0046] The second step: under a nitrogen atmosphere, 28.36g of intermediate 1, 26.93g of raw material 3, 0.5g of tri-tert-butyl phosphine, 0.18g of palladium carbon, 14.06g of anhydrous potassium carbonate and 300g of toluene were added to the reaction system, and the temperature was raised to 120°C and refluxed for 12 hours; after the reaction was completed, the temperature was slightly lowered, and diatomaceous earth was used for filtration. After the filtrate was cooled to room temperature, it was washed three times with water, the organic phase was retained, and the aqueous phase was then extracted with ethyl acetate. After the organic phases were combined, the organic phase was dried over anhydrous magnesium sulfate, filtered, spin-dried, and subjected to silica gel column chromatography. A mixture of petroleum ether and ethyl acetate was used as eluent, and spin-dried to give 37.58g of anti-ultraviolet aging agent 1.

[0047] Structure identification:

[0048] MS (m / z) of intermediate 1: [M+H] + =558;

[0049] MS (m / z) of UV-resistant aging agent 1: [M+H] + =918;

[0050] Anti-ultraviolet aging agent 1 1HNMR: δ8.57-8.33(m,5H),8.28(dd,1H),8.23-7.87(m,11H),7.64(d,1H), 7.58-7.43(m,5H),7.26-7.16(m,1H),7.19(s,1H),6.86(dd,1H),5.01-4.8 9(m,1H),4.78-4.68(m,1H),4.68-4.58(m,1H),4.40-4.29(m,1H),3.97-3. 84(m,1H),3.89(s,3H),3.77-3.64(m,2H),3.57-3.37(m,4H),2.49(d,3H).

[0051] Synthesis Example 2-Synthesis Example 4

[0052] In Synthesis Examples 2 to 4, anti-ultraviolet aging agents 2 to anti-ultraviolet aging agents 4 were synthesized in sequence, referring to the synthesis method of Synthesis Example 1, replacing raw material 2 therein, and remaining the same as Synthesis Example 1. Specific structures of raw material 2, anti-ultraviolet aging agents 2 to anti-ultraviolet aging agents 4, MS (m / z): [M+H] + See Table 1 for data.

[0053] Table 1. Structure of raw material 2, anti-ultraviolet aging agent 2-anti-ultraviolet aging agent 4 involved in synthesis examples 2-4, MS (m / z): [M+H] + data.

[0054]

[0055] Example 1

[0056] This embodiment provides an environmentally friendly composite hose with aluminum-plated PE as the middle layer and a preparation method thereof:

[0057] 1. Material preparation:

[0058] Inner layer material: Polylactic acid (PLA) is selected as the degradable polyester material layer with a thickness of 25 μm and a melt index of 8 g / 10 min (190°C / 2.16 kg).

[0059] Intermediate layer material: polyethylene layer aluminum-plated film, the aluminum-plated layer thickness is 30nm (facing the inner layer), and the polyethylene layer base material thickness is 20μm.

[0060] Outer layer material: The anti-aging layer is weighed in parts by mass: 50 parts of water-based acrylic resin (solid content 55%, acid value 45 mg KOH / g), 25 parts of color paste (phthalocyanine green G), 2 parts of dispersant (Nopco 5040 dispersant), 1 part of defoaming agent (sodium dodecylsulfonate), 20 parts of deionized water, and 3 parts of anti-ultraviolet aging agent (anti-ultraviolet aging agent 1 prepared in Synthesis Example 1).

[0061] 2. Preparation of prefabricated composite membrane:

[0062] The water-based acrylic resin, color paste, dispersant, defoaming agent, deionized water and anti-ultraviolet aging agent are put into a high-speed disperser and stirred at 1200r / min for 30 minutes until uniform to obtain an anti-aging layer slurry. The slurry is coated on the polyethylene layer substrate surface of the middle layer (aluminum-plated PE film) using a micro-gravure coater with a coating thickness of 15μm. It is then cured in a hot air drying oven at 70°C for 20 minutes to obtain a prefabricated composite film.

[0063] 3. Three-layer composite structure molding

[0064] Coat the inner layer (PLA film) with water-based polyurethane adhesive (coating amount 3g / m 2 ), and pressed together with the aluminum-plated surface of the middle layer through a composite machine, with the process parameters being: pressure: 8MPa, temperature: 60℃, speed: 8m / min; the composite material is placed in a 50℃ curing chamber for 36 hours to completely cross-link the adhesive; the cured three-layer composite film is cut into the required width, formed by a spiral tube winding machine, and heat-sealed at the tube shoulder at 90℃ and 0.5MPa to produce an environmentally friendly composite hose product with aluminum-plated PE as the middle layer.

[0065] Example 2-Example 4

[0066] An environmentally friendly composite hose with aluminum-plated PE as the middle layer is prepared by referring to the preparation method of Example 1, and the anti-ultraviolet aging agent therein is replaced with anti-ultraviolet aging agent 2 to anti-ultraviolet aging agent 4 prepared in Synthesis Example 2 to Synthesis Example 4 in sequence, and the rest remains the same as Example 1.

[0067] Comparative Example 1

[0068] An environmentally friendly composite hose with aluminum-plated PE as the middle layer was prepared by referring to the preparation method of Example 1, except that the anti-ultraviolet aging agent was not added, and the rest remained the same as Example 1.

[0069] Comparative Example 2

[0070] An environmentally friendly composite hose with aluminum-plated PE as the middle layer was prepared by referring to the preparation method of Example 1, except that the anti-ultraviolet aging agent was replaced with ultraviolet absorber UV326, and the rest remained the same as Example 1.

[0071] Comparative Example 3

[0072] An environmentally friendly composite hose with aluminum-plated PE as the middle layer was prepared by referring to the preparation method of Example 1, except that the mass fraction of the water-based acrylic resin was replaced with 30 parts, and the rest remained the same as Example 1.

[0073] Comparative Example 4

[0074] An environmentally friendly composite hose with aluminum-plated PE as the middle layer was prepared by referring to the preparation method of Example 1, except that the mass fraction of the water-based acrylic resin was replaced with 80 parts, and the rest remained the same as Example 1.

[0075] Performance testing:

[0076] 1. Tear Strength: In accordance with GB / T1040.2-2006, the mechanical properties of the environmentally friendly composite hoses prepared in the Examples and Comparative Examples with aluminized PE as the intermediate layer were tested using a universal electronic testing machine with a 12 cm × 10 cm × 0.5 mm diameter. The data are shown in Table 2.

[0077] 2. UV aging test: An environmentally friendly composite hose with aluminum-plated PE as the middle layer prepared in the examples and comparative examples was irradiated under a 315nm UV lamp for 500 hours to observe whether the surface turned yellow. The data are shown in Table 2.

[0078] 3. Oxygen permeability: The oxygen permeability of an environmentally friendly composite hose with an aluminum-plated PE middle layer prepared in the examples and comparative examples was tested in accordance with GB / T29336-2012. The data are shown in Table 2.

[0079] Table 2. Performance test data of an environmentally friendly composite hose with aluminum-plated PE as the middle layer prepared in the examples and comparative examples.

[0080] Tear strength MPa UV aging color <![CDATA[Oxygen permeability m 2 ·24h·0.1MPa]]> Example 1 128.5 No yellowing, no surface changes 2.75 Example 2 127.9 No yellowing, no surface changes 2.78 Example 3 128.2 No yellowing, no surface changes 2.76 Example 4 127.7 No yellowing, no surface changes 2.80 Comparative Example 1 117.3 Severe yellowing and brittle cracking on the surface 2.50 Comparative Example 2 115.6 Slight yellowing, no surface change 2.70 Comparative Example 3 114.8 Slight yellowing, no surface change 1.80 Comparative Example 4 112.5 Severe yellowing, slight cracking on the surface 1.64

[0081] All examples (samples using different UV inhibitors) demonstrated excellent tear strength and UV aging resistance, with high and stable tear strength and no noticeable yellowing or deformation after UV aging, demonstrating that the UV inhibitor effectively improved the mechanical properties and durability of the material. In contrast, the comparative examples exhibited a significant decrease in tear strength and exhibited varying degrees of yellowing and brittle cracking after UV aging, indicating that missing or inappropriate material ratios compromised the hose's integrity and aging resistance. Furthermore, the examples exhibited relatively high oxygen permeability, while the comparative examples exhibited decreased oxygen permeability when the resin content was varied, reflecting the potential impact of material composition changes on the balance of barrier properties. Overall, the examples exhibited superior overall performance, highlighting the critical role of UV inhibitors and resin content optimization in environmentally friendly composite hoses.

[0082] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly composite hose with aluminized PE as the middle layer, characterized in that: From the inside to the outside, it includes: an inner layer (1): a degradable polyester material layer; an intermediate layer (2): an aluminum-plated polyethylene film layer, including an aluminum-plated layer and a polyethylene layer, wherein the aluminum-plated layer faces the inner layer (1); an outer layer (3): an anti-aging layer; The anti-aging layer includes an anti-ultraviolet aging agent having a structure shown in Formula 1, The R1 is selected from the group consisting of: methyl, ethyl, tert-butyl, and methoxy.

2. The environmentally friendly composite hose with aluminum-plated PE as the middle layer according to claim 1, characterized in that: The anti-aging layer further comprises the following components calculated by mass: 40-65 parts of water-based acrylic resin, 15-35 parts of color paste, 1-3 parts of dispersant, 0.5-2 parts of defoaming agent, 10-25 parts of deionized water, and 1-5 parts of the above-mentioned anti-ultraviolet aging agent.

3. The environmentally friendly composite hose with aluminum-plated PE as the middle layer according to claim 2, characterized in that: The solid content of the water-based acrylic resin is ≥50%, and the acid value is 30-60 mg (KOH / g) of pure solid.

4. The environmentally friendly composite hose with aluminum-plated PE as the middle layer according to claim 2, characterized in that: The dispersant is specifically Nopco 5040 dispersant; the defoaming agent is specifically sodium dodecylsulfonate.

5. The environmentally friendly composite hose with aluminum-plated PE as the middle layer according to claim 2, characterized in that: The preparation method of the anti-aging layer is as follows: the water-based acrylic resin, color paste, dispersant, defoaming agent, deionized water and anti-ultraviolet aging agent are mixed and stirred evenly to form the anti-aging layer slurry; the anti-aging layer slurry is coated on the surface of the middle layer (2), and dried and solidified at 60-80°C to obtain the anti-aging layer.

6. The environmentally friendly composite hose with aluminum-plated PE as the middle layer according to claim 1, characterized in that: The material used for the degradable polyester material layer is polylactic acid.

7. The environmentally friendly composite hose with aluminum-plated PE as the middle layer according to claim 1, characterized in that: The thickness of the aluminum-plated layer in the aluminum-plated polyethylene film layer is 20-40 nm, and the thickness of the polyethylene layer is 10-30 μm.

8. A method for preparing an environmentally friendly composite hose with aluminum-plated PE as an intermediate layer according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. The anti-aging layer slurry is applied to the surface of the polyethylene layer and dried and cured at 60-80 ° C to obtain a prefabricated composite film; S2. The surface of the degradable polyester material layer is coated with an adhesive and bonded to the aluminum layer of the aluminized polyethylene film layer to obtain a three-layer composite structure; S3. Curing the three-layer composite structure at 40-60° C. for 24-48 hours to obtain an environmentally friendly composite hose with aluminum-plated PE as the middle layer.

9. The method for preparing an environmentally friendly composite hose with aluminum-plated PE as an intermediate layer according to claim 8, characterized in that: The bonding in S2 is completed at a pressure of 5-10 MPa and a temperature of 50-70°C.

10. The method for preparing an environmentally friendly composite hose with aluminum-plated PE as an intermediate layer according to claim 8, characterized in that: After solidification in S3, the three-layer composite structure is cut, rolled, and heat-sealed to form a hose. The heat-sealing temperature is 80-100° C., and the heat-sealing pressure is 0.3-0.6 MPa.

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