Multilayer composite antibacterial PE water supply pipe and preparation process thereof

Abstract

The application discloses a kind of multilayer composite antibacterial PE water supply pipeline and preparation process thereof, pipeline includes inner layer, outer layer and middle layer, inner layer is modified antibacterial inner layer, outer layer is ultraviolet resistant outer layer and middle layer is mechanical strengthening middle layer, prepare corresponding modified layer raw material according to proportion, after material preparation, material mixing, melting, co-extrusion, cutting, cutting, deburring and rest, etc., process steps, obtain a kind of multilayer composite antibacterial PE water supply pipeline.The beneficial effects of the application are: the inner layer of the antibacterial pipeline uses special PE material, which has excellent antibacterial performance after modification, can resist the growth and reproduction of various microorganisms for a long time, is not easily affected by water quality fluctuations and environment, the amount of material and antibacterial additive is harmless to human body and environment, environmentally friendly and sanitary, the pipeline has excellent corrosion resistance, mechanical strength and durability, the process is simple, and has strong practicality, suitable for mass production and engineering application.

Description

Technical Field

[0001] This invention relates to the technical field of PE water supply pipes, specifically to a multi-layer composite antibacterial PE water supply pipe and its manufacturing process. Background Technology

[0002] Water supply pipeline systems are a crucial component of urban infrastructure, directly impacting the normal operation of residents' lives and industrial production. However, traditional pipe materials such as metal and plastic have long had certain shortcomings during use, easily fostering bacteria and other microorganisms, leading to water quality deterioration and hygiene hazards.

[0003] Traditional metal pipes, such as iron and copper pipes, are susceptible to corrosion and rust due to the presence of oxygen and chemicals in the water. This can lead to the formation of deposits on the inner walls of the pipes, reducing flow rate and lowering water quality. Furthermore, metal pipes are prone to leaks caused by loose joints, corrosion, or aging, increasing maintenance and repair costs. In addition, metal pipes are relatively heavy, requiring more equipment and manpower for installation, thus increasing the difficulty and cost of construction.

[0004] Concrete pipes have low toughness and are easily broken. They are prone to cracking and breaking when faced with changes in underground soil and external forces such as earthquakes. The inner wall of concrete pipes may sometimes react with chemicals in the water, affecting water quality. Construction time and cost are also high.

[0005] Although PVC (polyvinyl chloride) and other plastic pipes are widely used in water supply systems, there are some limitations. Some plastic pipes may become brittle under high temperature conditions, which limits their application range. Chemical resistance may also be a problem for some special application scenarios.

[0006] PE water supply pipes, as a new type of pipe material, have a series of advantages over traditional materials: Corrosion resistance: PE pipes have excellent corrosion resistance and can operate stably for a long time under different water quality conditions without being affected by corrosion and rust. PE pipes are relatively lightweight, easy to handle and install, reducing the difficulty and cost of construction.

[0007] PE pipes have excellent flexibility and toughness, and can withstand changes in underground soil and external impacts, reducing the risk of cracking and breakage. The smooth inner wall of PE pipes makes them less prone to scale formation, and they have good flow characteristics, reducing the occurrence of water quality problems. PE pipes have a long service life, reducing the frequency of maintenance and repair, and lowering costs.

[0008] Water supply pipeline systems are a crucial component of modern urban infrastructure, directly impacting the normal operation of residential water use and commercial and industrial production. However, traditional water supply pipe materials have long suffered from problems such as microbial growth and biofilm formation, leading to adverse effects such as water quality deterioration, scale buildup, and pipe blockage, and potentially even posing health and environmental risks.

[0009] To ensure the water quality and hygiene safety of water supply systems, it is necessary to develop water supply pipe materials with antibacterial properties. Antibacterial pipe materials can inhibit the growth and adhesion of microorganisms, thereby reducing water quality problems and hygiene risks. The development of antibacterial pipes is of great significance for providing reliable water quality assurance, reducing pipe maintenance costs, and extending pipe lifespan.

[0010] Polyethylene (PE) is an ideal pipe material due to its lightweight, corrosion resistance, and insulation properties. However, traditional PE materials lack antibacterial properties, necessitating improvements to its material characteristics to meet the requirements of antibacterial water supply pipes.

[0011] Currently, some antibacterial technologies have been applied to water supply pipe materials, such as adding antibacterial agents and utilizing nanotechnology and surface modification. However, existing technologies have certain limitations in terms of antibacterial effect, durability, material stability, cost, and environmental friendliness. Therefore, it is necessary to develop a novel antibacterial pipe material and preparation process to overcome these limitations. Summary of the Invention

[0012] To address the aforementioned shortcomings, this patented technology aims to provide a multi-layer composite antibacterial PE water supply pipe with long-lasting antibacterial properties and its manufacturing process. By introducing multiple antibacterial substances, they work together to continuously and effectively provide effective antibacterial performance, forming a long-lasting and stable antibacterial protective layer inside the pipe, effectively inhibiting the growth and attachment of microorganisms.

[0013] This invention provides the following technical solution:

[0014] A multi-layer composite antibacterial PE water supply pipe includes an inner layer, an outer layer, and a middle layer. The inner layer is a modified antibacterial inner layer, the outer layer is a UV-resistant outer layer, and the middle layer is a mechanically reinforced middle layer. The modified antibacterial inner layer comprises the following raw materials in parts by weight:

[0015] The composition includes: 100-120 parts high-density polyethylene, 8-12 parts cationic polymer, 26-32 parts ethylene-propylene copolymer (EVA), 5-10 parts silver ion-supported nano-carbon powder, 0.8-1.5 parts nano-silver powder, 2-5 parts titanium dioxide nano-powder, 0.1-0.5 parts antioxidant, 1-2 parts compatibilizer, 1-2 parts crosslinking agent, 0.6-1 part silane coupling agent, 3-5 parts paraffin wax flow agent, 5-8 parts calcium-zinc stabilizer, 2-3 parts methyl stearate defoamer, and 1-3 parts dispersant.

[0016] The intermediate mechanical reinforcement layer comprises the following raw materials in parts by weight:

[0017] Medium-density polyethylene (MDPE) 100-120 parts, polypropylene-ethylene-styrene copolymer 15-20 parts, acrylic acid grafted polyethylene (PE-g-AA) 10-15 parts, plasticizer epoxidized soybean oil 3-4 parts, carbon fiber 5-8 parts, glass fiber 5-8 parts, nano titanium dioxide 25-30 parts, antioxidant 0.2-0.5 parts, calcium zinc stabilizer 3-5 parts, silane coupling agent 0.5-1 part, crosslinking agent 1-2 parts, dispersant 1-2 parts;

[0018] The UV-protective outer layer comprises the following raw materials in parts by weight:

[0019] 100-120 parts of linear low-density polyethylene (LLDPE), 20-25 parts of titanium dioxide powder, 20-25 parts of calcium carbonate, 1-2 parts of silane coupling agent, 0.5-0.8 parts of dispersant, 0.3-0.5 parts of antioxidant, 2-3 parts of ultraviolet absorber, and 2-3 parts of light stabilizer.

[0020] A manufacturing process for a multi-layer composite antibacterial PE water supply pipe includes the following steps:

[0021] S1. Material Preparation: Ensure that the required raw materials are prepared according to the formula, and mix and weigh the various raw materials in accurate proportions, including the base materials of the inner layer, middle layer and outer layer, as well as other additives and reinforcing materials that need to be added.

[0022] S2. Material mixing: The raw materials of each layer are mixed separately. To ensure uniform mixing, a closed mixing machine is used to mix the materials so that the components of each layer are evenly dispersed and a premix is ​​obtained. The mixture is then processed into a suitable shape to obtain inner layer masterbatch, middle layer masterbatch and outer layer masterbatch.

[0023] S3. Melting: The masterbatch of each layer is heated and melted through a twin-screw extruder to make it into a hot-melt flow state, and further stirred to ensure that the material is fully melted and uniform;

[0024] S4. Co-extrusion: This involves simultaneously extruding the hot-melt masterbatch layers using a three-layer co-extrusion process. During this process, it is necessary to control the temperature (outer layer 185–188℃, middle layer 193–198℃, inner layer 205–210℃) and the melt rate to ensure a tight bond between the inner, middle, and outer layers. Co-extrusion technology can be achieved using multi-layer extruders or multi-outlet extruders.

[0025] S5. Cooling and shaping: The extruded hot melt material is cooled by a cooling device to rapidly solidify and shape it;

[0026] S6. Cutting and shaping: Cut the pipe according to the predetermined size requirements using appropriate cutting tools to ensure that the pipe length and shape meet the requirements;

[0027] S7. Deburring and finishing: After cutting, the cut part of the pipe is deburred and finished to ensure that the cut is smooth and burr-free and meets the required surface quality requirements.

[0028] Furthermore, the cationic polymer is polyethyleneimine (PEI), which improves the mechanical properties of the material, enhances its heat resistance, improves its chemical stability, reduces its moisture permeability, and the resulting cross-linked structure further controls the release of silver ions.

[0029] Furthermore, the antioxidant is a 1:1 mixture of an amine antioxidant and a phosphite. The amine antioxidant is one of 4,4'-bis(α,α-dimethylphenyl)diphenylamine or N,N-di-sec-butyl-p-phenylenediamine. The phosphite is one of tridecyl phosphite, trilaurylic phosphite, or triisodecyl phosphite. The antioxidant used in the outer layer is a phosphate ester antioxidant, specifically one of tripropyl phosphate (TPP) and triisooctylphosphonate (TXP).

[0030] Furthermore, the compatibilizer used in the inner layer is low-density polyethylene grafted with acrylic acid, with a grafting rate of 8-12%, which enhances the adhesion of polyethylene to other materials, improves the dispersibility of polyethylene and fillers, increases the impact strength and toughness of polyethylene, and promotes the formation of the blend phase.

[0031] Furthermore, the silane coupling agents used in the inner and middle layers are both γ-propyl methacrylate silane (MPS) and γ-propyl methacrylate trimethoxysilane (MPTS), which can effectively increase the bonding ability between polyethylene and inorganic fillers, improve the chemical resistance of polyethylene, and enhance its anti-aging properties.

[0032] Furthermore, the dispersant used in the inner, middle and outer layers is one of sodium dodecylbenzenesulfonate (SDBS) and hexadecyltrimethylammonium bromide (CTAB), which helps to ensure the uniformity of the modified material, prevent the agglomeration of additives or pigments, thereby improving the performance consistency of the material and ensuring the durability and performance improvement of additives or fillers in the material.

[0033] Furthermore, the crosslinking agent used in the inner and middle layers is food-grade peracetic acid. Peracetic acid can undergo a crosslinking reaction with polymer materials to form a crosslinked structure. This crosslinking can significantly improve the strength, stability, and heat resistance of the material, enhance its anti-aging properties, improve its chemical resistance, reduce its permeability, and further control the continuous and stable release of silver ions, thus stabilizing the silver ion release rate.

[0034] Furthermore, the ultraviolet absorber is one of phenyl dione, phenyl ketone, and phenyl trione, used to absorb ultraviolet light, and the light stabilizer is a light-stabilized ketone, specifically one of benzotriazole ketone and benzodiazole ketone, to increase photostability, thereby further increasing the outer layer's resistance to ultraviolet light.

[0035] Furthermore, the extrusion temperature of each layer in the co-extrusion operation is 185-188°C for the outer layer, 193-198°C for the middle layer, and 205-210°C for the inner layer, ensuring that the extrusion temperature of each layer is within the corresponding appropriate range.

[0036] The beneficial effects of this invention are: 1. Highly efficient antibacterial performance. The inner layer of the antibacterial pipe is made of special PE material, which has been modified to have excellent antibacterial performance. It can resist the growth and reproduction of a variety of microorganisms and has strong antibacterial ability. It can be used for water supply in the medical and health field.

[0037] 2. The present invention has a strong and long-lasting antibacterial effect. The antibacterial material in the inner layer of the pipe is durable and can maintain its antibacterial effect for a long time. It is not easily affected by water quality fluctuations and environmental factors.

[0038] Environmental protection and hygiene: The materials and antimicrobial additives are harmless to humans and the environment, meeting relevant environmental protection and hygiene standards.

[0039] 3. Superior overall performance: The multi-layer composite PE material of this invention has excellent corrosion resistance, mechanical strength and durability, and is suitable for different water supply systems and usage environments.

[0040] 4. The preparation process of this invention uses high-density polyethylene for the inner layer and low-cost medium-density polyethylene and linear low-density polyethylene for the middle and outer layers, which can effectively save production costs, is highly feasible, has a simple preparation process, is highly implementable, and is suitable for large-scale production and engineering applications. Attached Figure Description

[0041] Figure 1This is a schematic cross-sectional view of the pipe obtained by the present invention;

[0042] The diagram is labeled: 1 - inner layer, 2 - outer layer, 3 - middle layer. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. 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.

[0044] The high-density polyethylene used in this invention is HDPE P6006 / P6006M, the medium-density polyethylene is MDPEM2701, and the linear low-density polyethylene is LLDPE C6. The EVA material used is low-density polyethylene-propylene copolymer with a propylene content of less than 5%. The silver ion-loaded nano-carbon powder is prepared by soaking nano-carbon powder in a 1mol / L silver chloride solution for 2 hours and then drying it. All other reagents are standardized reagents. All purchased raw materials meet food safety certification, and all additives are food-grade. The water pipes produced by this invention can effectively control the release of silver ions to meet national safety standards. After testing, they meet the Hygiene and Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials (2001). The specifications of the produced water pipes are that the thickness ratio of the inner layer, middle layer, and outer layer is 2:1:2.

[0045] Example 1

[0046] S1. Material Preparation: Ensure that the required raw materials are prepared according to the formula, and mix and weigh the various raw materials in accurate proportions, including the base materials of the inner layer, middle layer, and outer layer, as well as any other additives and reinforcing materials that need to be added. The raw material formula is as follows:

[0047] Inner layer 1: 100 parts high-density polyethylene, 8 parts cationic polymer, 26 parts ethylene-propylene copolymer (EVA), 5 parts silver ion supported nano carbon powder, 0.8 parts nano silver powder, 2 parts titanium dioxide nano powder, 0.1 parts antioxidant, 1 part compatibilizer, 1 part crosslinking agent, 0.6 parts silane coupling agent, 3 parts paraffin wax flow agent, 5 parts calcium zinc stabilizer, 2 parts methyl stearate defoamer, and 1 part dispersant;

[0048] Middle layer 2: 100 parts medium-density polyethylene (MDPE), 15 parts polypropylene-ethylene-styrene copolymer, 10 parts acrylic grafted polyethylene (PE-g-AA), 3 parts plasticizer epoxidized soybean oil, 5 parts carbon fiber, 5 parts glass fiber, 25 parts nano titanium dioxide, 0.2 parts antioxidant, 3 parts calcium zinc stabilizer, 0.5 parts silane coupling agent, 1 part crosslinking agent, and 1 part dispersant;

[0049] Outer layer 3: 100 parts linear low-density polyethylene (LLDPE), 25 parts titanium dioxide powder, 25 parts calcium carbonate, 2 parts silane coupling agent, 0.8 parts dispersant, 0.5 parts antioxidant, 3 parts ultraviolet absorber, and 3 parts light stabilizer.

[0050] S2. Material mixing: The raw materials of each layer are mixed separately to ensure uniform mixing. A closed mixing machine is used to mix the materials so that the components of each layer are evenly dispersed and a premix is ​​obtained. The mixture is then processed into a suitable shape to obtain inner layer masterbatch, middle layer masterbatch and outer layer masterbatch.

[0051] S3. Melting: The masterbatch of each layer is heated and melted through a twin-screw extruder to make it into a hot-melt flow state, and further stirred to ensure that the material is fully melted and uniform;

[0052] S4. Co-extrusion: This involves simultaneously extruding the hot-melt masterbatch layers using a three-layer co-extrusion process. During this process, it is necessary to control the temperature (outer layer 185–188℃, middle layer 193–198℃, inner layer 205–210℃) and the melting rate to ensure a tight bond between the inner, middle, and outer layers. Co-extrusion technology can be achieved using multi-layer extruders or multi-outlet extruders.

[0053] S5. Cooling and Shaping: The extruded hot-melt material is cooled by a cooling device to rapidly solidify and shape it. The cooling device may include a water tank, air cooling device, etc. During the cooling process, the cooling rate and temperature need to be controlled to ensure that the pipe has the required dimensions and performance.

[0054] S6. Cutting and Shaping: According to the predetermined size requirements, use appropriate cutting tools (such as pipe cutters, cutting machines, etc.) to cut the pipe to ensure that the pipe length and shape meet the requirements.

[0055] S7. Deburring and finishing: After cutting, the cut part of the pipe is deburred and finished to ensure that the cut is smooth and burr-free and meets the required surface quality requirements.

[0056] Example 2

[0057] The modified formula is as follows: Inner layer: 120 parts high-density polyethylene, 12 parts cationic polymer, 32 parts ethylene-propylene copolymer (EVA), 10 parts silver ion supported nano carbon powder, 1.5 parts nano silver powder, 5 parts titanium dioxide nano powder, 0.5 parts antioxidant, 2 parts compatibilizer, 2 parts crosslinking agent, 1 part silane coupling agent, 5 parts flow agent paraffin wax, 8 parts calcium zinc stabilizer, 3 parts defoamer methyl stearate, and 3 parts dispersant;

[0058] Middle layer: 120 parts medium-density polyethylene (MDPE), 20 parts polypropylene-ethylene-styrene copolymer, 15 parts acrylic grafted polyethylene (PE-g-AA), 4 parts plasticizer epoxidized soybean oil, 8 parts carbon fiber, 8 parts glass fiber, 30 parts nano titanium dioxide, 0.5 parts antioxidant, 5 parts calcium zinc stabilizer, 1 part silane coupling agent, 2 parts crosslinking agent, and 2 parts dispersant;

[0059] Outer layer: 120 parts linear low-density polyethylene (LLDPE), 25 parts titanium dioxide powder, 25 parts calcium carbonate, 2 parts silane coupling agent, 0.8 parts dispersant, 0.5 parts antioxidant, 3 parts ultraviolet absorber, and 3 parts light stabilizer.

[0060] Example 3

[0061] Modify the inner layer formulation to remove the cationic polymer, while keeping other conditions unchanged.

[0062] Example 4

[0063] The inner layer formula was modified to remove silver ion-loaded carbon nanoparticles, while other conditions remained unchanged.

[0064] Example 5

[0065] Modify the inner layer formula by removing the nano silver powder, while keeping other conditions unchanged.

[0066] According to the testing standard of GB / T 31402-2015, standard samples were prepared for the inner layer material of the multi-layer composite antibacterial PE water supply pipe in the example, and then antibacterial experiments were conducted to measure the antibacterial rate. The results are listed in the table below:

[0067]

[0068]

[0069] In the antibacterial performance test of the pipeline, the antibacterial rate decreased to 98% after one year, indicating that the pipeline's antibacterial performance is excellent. The antibacterial rate remains very high, with only a slight decrease, which means that the pipeline can still effectively inhibit or kill bacteria, fungi, or other microorganisms within one year, thereby reducing the risk of microbial contamination. Therefore, the pipeline of this invention is suitable for water supply pipelines, especially in fields with very high hygiene requirements, such as medical equipment, food processing, and pharmaceuticals.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0071] 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. A multi-layer composite antibacterial PE water supply pipe, characterized in that: It comprises an inner layer, an outer layer, and a middle layer, wherein the inner layer is a modified antibacterial inner layer, the outer layer is a UV-protective outer layer, and the middle layer is a mechanically reinforced middle layer. The modified antibacterial inner layer comprises the following raw materials in parts by weight: The composition includes: 100-120 parts high-density polyethylene, 8-12 parts cationic polymer, 26-32 parts ethylene-propylene copolymer (EVA), 5-10 parts silver ion-supported nano-carbon powder, 0.8-1.5 parts nano-silver powder, 2-5 parts titanium dioxide nano-powder, 0.1-0.5 parts antioxidant, 1-2 parts compatibilizer, 1-2 parts crosslinking agent, 0.6-1 part silane coupling agent, 3-5 parts paraffin wax flow agent, 5-8 parts calcium-zinc stabilizer, 2-3 parts methyl stearate defoamer, and 1-3 parts dispersant. The intermediate mechanical reinforcement layer comprises the following raw materials in parts by weight: Medium-density polyethylene (MDPE) 100-120 parts, polypropylene-ethylene-styrene copolymer 15-20 parts, acrylic acid grafted polyethylene (PE-g-AA) 10-15 parts, plasticizer epoxidized soybean oil 3-4 parts, carbon fiber 5-8 parts, glass fiber 5-8 parts, nano titanium dioxide 25-30 parts, antioxidant 0.2-0.5 parts, calcium zinc stabilizer 3-5 parts, silane coupling agent 0.5-1 part, crosslinking agent 1-2 parts, dispersant 1-2 parts; The UV-protective outer layer comprises the following raw materials in parts by weight: 100-120 parts of linear low-density polyethylene (LLDPE), 20-25 parts of titanium dioxide powder, 20-25 parts of calcium carbonate, 1-2 parts of silane coupling agent, 0.5-0.8 parts of dispersant, 0.3-0.5 parts of antioxidant, 2-3 parts of ultraviolet absorber, and 2-3 parts of light stabilizer.

2. The multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that: The cationic polymer is polyethyleneimine (PEI).

3. The multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that: The antioxidant is a 1:1 mixture of an amine antioxidant and a phosphite. The amine antioxidant is one of 4,4'-bis(α,α-dimethylphenyl)diphenylamine or N,N-disec-butyl-p-phenylenediamine. The phosphite is one of tridecyl phosphite, trilauryl phosphite, or triisodecyl phosphite. The antioxidant used in the outer layer is a phosphate ester antioxidant, specifically one of tripropyl phosphate (TPP) and triisooctylphosphonate (TXP).

4. The multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that: The compatibilizer used in the inner layer is low-density polyethylene grafted with acrylic acid, with a grafting rate of 8-12%.

5. The multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that: The silane coupling agents used in the inner and middle layers are both one of γ-propyl methacrylate silane (MPS) and γ-propyl methacrylate trimethoxysilane (MPTS).

6. The multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that: The dispersant used in the inner, middle and outer layers is one of sodium dodecylbenzenesulfonate (SDBS) and hexadecyltrimethylammonium bromide (CTAB).

7. The multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that: The crosslinking agent used in the inner and middle layers is food-grade peracetic acid.

8. The multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that: The ultraviolet absorber is one of phenyl dione, phenyl ketone, and phenyl trione, and the light stabilizer is a light-stabilized ketone, specifically one of benzotriazole ketone and benzodiazole ketone.

9. The manufacturing process of a multi-layer composite antibacterial PE water supply pipe according to claim 1, characterized in that... Includes the following steps: S1. Material preparation: Ensure that the required raw materials are prepared according to the formula, and mix and weigh the various raw materials in accurate proportions, including the base materials of the inner layer material, middle layer material and outer layer material, as well as other additives and reinforcing materials that need to be added; S2. Material mixing: The raw materials of each layer are mixed separately. To ensure uniform mixing, a closed mixing machine is used to mix the materials so that the components of each layer are evenly dispersed and a premix is ​​obtained. The mixture is then processed into a suitable shape to obtain inner layer masterbatch, middle layer masterbatch and outer layer masterbatch. S3. Melting: The masterbatch layers are heated and melted through a twin-screw extruder to make it a hot-melt flow state, and further stirred to ensure that the material is fully and uniformly melted; S4. Co-extrusion: Through a three-layer co-extrusion process, the hot-melt masterbatch layers are extruded simultaneously to ensure that the inner, middle, and outer layer materials form a tight bond; S5. Cooling and molding: The extruded hot melt material is cooled by a cooling device to rapidly solidify and shape it; S6. Cutting and shaping: Cut the pipe according to the predetermined size requirements using appropriate cutting tools to ensure that the pipe length and shape meet the requirements; S7. Deburring and finishing: After cutting, the cut part of the pipe is deburred and finished to ensure that the cut is smooth and burr-free and meets the required surface quality requirements.

10. The manufacturing process of a multi-layer composite antibacterial PE water supply pipe according to claim 9, characterized in that: The extrusion temperature of each layer in the co-extrusion operation is 185-188℃ for the outer layer, 193-198℃ for the middle layer, and 205-210℃ for the inner layer.

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