Flexible sealed self-locking polyethylene wound solid wall pipe and preparation method thereof

Abstract

The present invention discloses a kind of flexible sealing self-locking polyethylene winding solid wall pipe and its preparation method, relate to the field of pipes.Wherein, the preparation raw materials of flexible sealing self-locking polyethylene winding solid wall pipe include 15-25wt% nucleating masterbatch and surplus high-density polyethylene, the nucleating masterbatch is obtained by melt plasticizing granulation of 28-32wt% metallocene polyethylene, 18-22wt% ultra-high molecular weight polyethylene and 50wt% modified talcum powder, the modified talcum powder is made by talcum powder, silane coupling agent, aluminate coupling agent, stearic acid, olefin wax by weight ratio 100: (0.8-1.2): (0.8-1.2): (1.5-2.5): (1.5-2.5) uniformly mixed. The flexible sealing self-locking polyethylene winding solid wall pipe of the present application has low shrinkage and small fluctuation, and the precision of the pipeline connection is high, and it is not easy to leak.

Description

Technical Field

[0001] The present application relates to the field of pipes, and in particular to a flexible sealed self-locking polyethylene wound solid wall pipe and a preparation method thereof. Background Art

[0002] Flexible, sealed, self-locking polyethylene wrapped solid-wall pipe (commonly known as top-drawn pipe) faces numerous challenges under current production processes. The traditional production method involves heating and melting the polyethylene material through an extruder to form a "strip" billet. This billet is then wound around a roller mold in a hot, continuous winding process. After cooling, the socket is machined on a lathe.

[0003] Because this pipe utilizes a flexible, self-locking connection, relying on the interlocking teeth of the socket to secure the connection, it requires extremely high dimensional accuracy. A poor fit can easily lead to leaks during use. However, the high-density polyethylene (HDPE) currently used in production has a significant molding shrinkage of approximately 2-4%, making it difficult to precisely control the dimensional accuracy of the socket during actual production. The dimensional error fluctuates widely, often exceeding the precision required for actual use. This leads to frequent leaks, seriously impacting product quality and performance. Summary of the Invention

[0004] In the related art, the socket of a flexible sealed self-locking polyethylene wrapped solid wall pipe has a large fluctuation range of socket size error due to its large shrinkage rate, which makes the connection between the pipes prone to leakage. In order to improve this problem, the present application provides a flexible sealed self-locking polyethylene wrapped solid wall pipe and a preparation method thereof. The flexible sealed self-locking polyethylene wrapped solid wall pipe has a low shrinkage rate and small fluctuation, the socket processing size accuracy is high, and it is not easy to leak.

[0005] A flexible, sealed, self-locking polyethylene-wound solid-wall pipe comprises 15-25 wt% of a nucleating masterbatch and the balance high-density polyethylene. The nucleating masterbatch is obtained by melt-plasticizing and granulating 28-32 wt% of metallocene polyethylene, 18-22 wt% of ultra-high molecular weight polyethylene, and 50 wt% of modified talc. The modified talc is obtained by uniformly mixing talc, a silane coupling agent, an aluminate coupling agent, stearic acid, and olefin wax in a weight ratio of 100: (0.8-1.2): (0.8-1.2): (1.5-2.5): (1.5-2.5).

[0006] The present application's nucleation masterbatch refines the grains through the heterogeneous nucleation of talcum powder, the regular crystallization of metallocene polyethylene optimizes shrinkage uniformity, and the molecular entanglement of ultra-high molecular weight polyethylene suppresses the synergistic effect of shrinkage, which reduces the molding shrinkage of the pipe, and the shrinkage fluctuation is small, greatly improving the dimensional stability of the product, and effectively solving the difficult control and leakage problems of the socket size accuracy caused by the unstable shrinkage. However, considering the dispersibility problem of talcum powder, the present application first adopts silane coupling agent, aluminate coupling agent, stearic acid and olefin wax to modify talcum powder and pre-treat it, which is conducive to improving the dispersibility of talcum powder in polyethylene material. Secondly, metallocene polyethylene and ultra-high molecular weight polyethylene are introduced into the nucleation masterbatch, while making up for the problem of material toughness reduction caused by adding talcum powder, ensuring that the overall toughness of the pipe meets the use requirements, so that it is not easily damaged under complex installation and use environment. In addition, the addition of ultra-high molecular weight polyethylene can also give the pipe excellent wear resistance, so that it can better cope with the erosion of mud and sand mixture in underground drainage and sewage environment, and extend the service life of the pipe.

[0007] In some specific embodiments, the talc powder has a mesh size of 600-800 mesh and an aspect ratio of 10-20.

[0008] In some specific embodiments, the preparation method of the modified talc is as follows:

[0009] The talc powder is heated and stirred. When the temperature of the talc powder reaches 80-85° C., a silane coupling agent and an aluminate coupling agent are added and stirred. When the temperature of the talc powder reaches 90-95° C., stearic acid is added and stirred. When the temperature of the talc powder reaches 100-105° C., olefin wax is added and stirred until uniformly dispersed to obtain modified talc powder.

[0010] The present application controls the addition temperature of silane coupling agent, silane coupling agent, aluminate coupling agent, stearic acid and olefin wax, which is conducive to better dispersion of each additive in talc powder, coating talc powder, and improving the dispersion effect of talc powder in polyethylene material.

[0011] In some specific embodiments, the molecular weight of the metallocene polyethylene is 80,000-150,000.

[0012] In some specific embodiments, the molecular weight of the ultra-high molecular weight polyethylene is 4 million to 5 million.

[0013] In some preferred embodiments, the ultra-high molecular weight polyethylene is modified ultra-high molecular weight polyethylene, and the raw materials for preparing the modified ultra-high molecular weight polyethylene include side chain monoacrylate silicone oil, polyethylene glycol, ultra-high molecular weight polyethylene and peroxidation initiator in a weight ratio of (8.2-9.6): (2-4): 100: (0.01-0.015).

[0014] In the present application, when ultra-high molecular weight polyethylene adopts the modified ultra-high molecular weight polyethylene mentioned above, it is beneficial to improve the processing of the nucleating masterbatch and promote the uniform mixing of the various raw materials of the nucleating masterbatch. On the premise of ensuring the low shrinkage rate of the pipe, the wall thickness tolerance of the pipe can be further reduced and the wall thickness accuracy of the pipe can be improved.

[0015] Ultra-high molecular weight polyethylene (UHMWPE) modified with side-chain monoacrylate silicone oil and polyethylene glycol. The polyethylene glycol coating on the UHMWPE surface mitigates the high viscosity of the UHMWPE and enables the grafting reaction between the side-chain monoacrylate silicone oil and the UHMWPE to complete at 180-190°C. Furthermore, controlling the grafting amount of the side-chain monoacrylate silicone oil within the application range maintains the wear resistance of the UHMWPE.

[0016] In some specific embodiments, the polyethylene glycol is at least one of PEG6000 and PEG8000.

[0017] In some specific embodiments, the structural formula of the side chain monoacrylate silicone oil is as follows:

[0018] ;

[0019] The value of n is 45-50, and the value of m is 1.

[0020] In some specific embodiments, the method for preparing the modified ultra-high molecular weight polyethylene comprises the following steps:

[0021] After polyethylene glycol and ultra-high molecular weight polyethylene are uniformly melted at 180-190° C., side chain monoacrylate silicone oil and peroxidation initiator are added, and the temperature is maintained at 180-190° C. for grafting reaction to obtain modified ultra-high molecular weight polyethylene.

[0022] In a second aspect, the present application provides a method for preparing a flexible sealed self-locking polyethylene wound solid wall tube using the following technical solution:

[0023] A method for preparing a flexible sealed self-locking polyethylene wound solid wall pipe comprises the following steps:

[0024] S1. After the modified talc powder and ultra-high molecular weight polyethylene are uniformly melted at 180-190°C, metallocene polyethylene is added, and the temperature is maintained at 180-190°C for melting and plasticization, followed by extrusion and granulation to obtain a nucleating masterbatch;

[0025] S2. Evenly mix the nucleating masterbatch and high-density polyethylene according to the ratio, feed them into the extruder, heat and melt the extruded billet at 180-190°C, wind the billet on a roller mold, cool it, and perform socket processing to obtain a flexible, sealed, self-locking polyethylene wound solid wall pipe.

[0026] In summary, this application has at least the following beneficial technical effects:

[0027] (1) The nucleating masterbatch of the present application reduces the molding shrinkage of the pipe through the synergistic effect of the modified talc powder's heterogeneous nucleation to refine the grains, the metallocene polyethylene's regular crystallization to optimize the shrinkage uniformity, and the ultra-high molecular weight polyethylene's molecular entanglement to inhibit shrinkage, and the shrinkage fluctuation is small, which greatly improves the dimensional stability of the product and effectively solves the problems of difficult to control the socket dimensional accuracy and leakage caused by large and unstable shrinkage.

[0028] (2) In the present application, the ultra-high molecular weight polyethylene is modified by using side chain monoacrylate silicone oil and polyethylene glycol to produce a product, which is beneficial to improving the processing of the nucleating masterbatch and promoting the uniform mixing of the various raw materials of the nucleating masterbatch. Under the premise of ensuring a low shrinkage rate of the pipe, the wall thickness tolerance of the pipe can be further reduced, thereby improving the wall thickness accuracy of the pipe. DETAILED DESCRIPTION

[0029] The present application is further described below in conjunction with specific experiments.

[0030] Preparation Example

[0031] [Preparation Example 1-1]

[0032] Modified talcum powder, the preparation raw materials include:

[0033] Talc powder: 100 kg; in this preparation example, the talc powder is 600 mesh and the diameter-to-thickness ratio is 10-20;

[0034] Vinyl silane coupling agent: 0.8 kg; in this preparation example, the vinyl silane coupling agent specifically uses vinyltrimethoxysilane;

[0035] Aluminate coupling agent UP-801: 1.2kg;

[0036] Stearic acid: 1.5kg;

[0037] Polyethylene wax A-C6A: 2.5kg;

[0038] In this preparation example, the preparation method of modified talc is as follows:

[0039] Add talc powder into a reactor and heat and stir the talc powder. When the temperature of the talc powder reaches 80°C, add vinyl silane coupling agent and aluminate coupling agent UP-801 and stir. When the temperature of the talc powder reaches 90°C, add stearic acid and stir. When the temperature of the talc powder reaches 100°C, add polyethylene wax A-C6A and stir until uniformly dispersed to obtain modified talc powder.

[0040] [Preparation Example 1-2]

[0041] Modified talcum powder, the preparation raw materials include:

[0042] Talc powder: 100 kg; in this preparation example, the talc powder is 600 mesh and the diameter-to-thickness ratio is 10-20;

[0043] Vinyl silane coupling agent: 1.2 kg; in this preparation example, the vinyl silane coupling agent specifically uses vinyl triethoxysilane;

[0044] Aluminate coupling agent UP-801: 0.8kg;

[0045] Stearic acid: 2.5kg;

[0046] Polyethylene wax A-C6A: 1.5kg;

[0047] In this preparation example, the preparation method of modified talc is as follows:

[0048] Add talc powder into a reactor and heat and stir the talc powder. When the temperature of the talc powder reaches 85°C, add vinyl silane coupling agent and aluminate coupling agent UP-801 and stir. When the temperature of the talc powder reaches 95°C, add stearic acid and stir. When the temperature of the talc powder reaches 105°C, add polyethylene wax A-C6A and stir until uniformly dispersed to obtain modified talc powder.

[0049] [Preparation Example 2-1]

[0050] Modified ultra-high molecular weight polyethylene, the raw materials for preparation include:

[0051] Side chain monoacrylate silicone oil: 8.2 kg; In this preparation example, the structural formula of the side chain monoacrylate silicone oil is as follows:

[0052] ; The value of n is 45, and the value of m is 1;

[0053] Polyethylene glycol 6000: 2kg;

[0054] Ultra-high molecular weight polyethylene: 100 kg; in this preparation example, ultra-high molecular weight polyethylene is a product of Korea Petrochemical U050, with a molecular weight of 5 million;

[0055] Dicumyl peroxide: 0.01kg.

[0056] In this preparation example, the preparation method of modified ultra-high molecular weight polyethylene includes the following steps:

[0057] After polyethylene glycol 6000 and ultra-high molecular weight polyethylene are uniformly melted at 180-190° C., side chain monoacrylate silicone oil and dicumyl peroxide are added and the temperature is maintained at 180-190° C. for grafting reaction to obtain modified ultra-high molecular weight polyethylene.

[0058] [Preparation Example 2-2]

[0059] Modified ultra-high molecular weight polyethylene, the raw materials for preparation include:

[0060] 9.6 kg of side chain monoacrylate silicone oil; in this preparation example, the structural formula of the side chain monoacrylate silicone oil is as follows:

[0061] ; The value of n is 50, and the value of m is 1;

[0062] Polyethylene glycol 6000: 4 kg;

[0063] Ultra-high molecular weight polyethylene: 100 kg; in this preparation example, ultra-high molecular weight polyethylene is a product of Korea Petrochemical U050, with a molecular weight of 5 million;

[0064] Dicumyl peroxide: 0.015kg.

[0065] In this preparation example, the preparation method of modified ultra-high molecular weight polyethylene includes the following steps:

[0066] After polyethylene glycol 6000 and ultra-high molecular weight polyethylene are uniformly melted at 180-190° C., side chain monoacrylate silicone oil and dicumyl peroxide are added and the temperature is maintained at 180-190° C. for grafting reaction to obtain modified ultra-high molecular weight polyethylene.

[0067] [Preparation Example 2-3]

[0068] The modified ultra-high molecular weight polyethylene differs from [Preparation Example 2-1] in that the side chain monoacrylate silicone oil is replaced by an equal mass of vinyl-terminated hydroxyl-terminated silicone oil, in which the polymerization degree of the dimethylsiloxane segment is 45.

[0069] [Preparation Example 2-4]

[0070] The modified ultra-high molecular weight polyethylene differs from [Preparation Example 2-1] in that polyethylene glycol 6000 is replaced by polyethylene glycol 10000 of equal mass.

[0071] [Preparation Example 2-5]

[0072] The modified ultra-high molecular weight polyethylene differs from [Preparation Example 2-1] in that no polyethylene glycol 6000 is added.

[0073] Example

[0074] [Example 1]

[0075] A flexible, sealed, self-locking polyethylene wound solid-wall pipe. The raw materials for preparing the flexible, sealed, self-locking polyethylene wound solid-wall pipe include 15wt% of a nucleating masterbatch and 85wt% of high-density polyethylene (Formosa Plastics 8001). The nucleating masterbatch is obtained by melt-plasticizing and granulating 32wt% of metallocene polyethylene (ExxonMobil 1018), 22wt% of ultra-high molecular weight polyethylene (Korea Petrochemical U050) and 50wt% of modified talc powder [Preparation Example 1-1].

[0076] In this embodiment, the method for preparing the flexible sealed self-locking polyethylene wound solid wall tube includes the following steps:

[0077] S1. After the modified talc powder and ultra-high molecular weight polyethylene are uniformly melted at 180-190°C according to the ratio, the metallocene polyethylene is added, and the temperature is maintained at 180-190°C for melting and plasticization, followed by extrusion and granulation to obtain a nucleating masterbatch;

[0078] S2. Evenly mix the nucleating masterbatch and high-density polyethylene according to the ratio, feed them into the extruder, heat and melt the extruded billet at 180-190°C, wind the billet on a roller mold, cool it, and perform socket processing to obtain a flexible, sealed, self-locking polyethylene wound solid wall pipe.

[0079] [Example 2]

[0080] A flexible, sealed, self-locking polyethylene wrapped solid wall tube is different from [Example 1] in that the raw materials for preparing the flexible, sealed, self-locking polyethylene wrapped solid wall tube include 25wt% nucleating masterbatch and 75wt% high-density polyethylene (Formosa Plastics 8001), wherein the nucleating masterbatch is obtained by melt-plasticizing and granulating 28wt% metallocene polyethylene (ExxonMobil 1018), 22wt% ultra-high molecular weight polyethylene (Korea Petrochemical U050) and 50wt% modified talc powder [Preparation Example 1-2].

[0081] [Example 3]

[0082] A flexible sealed self-locking polyethylene wound solid wall tube, which differs from [Example 1] in that: in the nucleating masterbatch, the ultra-high molecular weight polyethylene is replaced by the modified ultra-high molecular weight polyethylene prepared in [Preparation Example 2-1].

[0083] [Example 4]

[0084] A flexible sealed self-locking polyethylene wound solid wall tube, which differs from [Example 1] in that: in the nucleating masterbatch, the ultra-high molecular weight polyethylene is replaced by the modified ultra-high molecular weight polyethylene prepared in [Preparation Example 2-2].

[0085] [Example 5]

[0086] A flexible sealed self-locking polyethylene wound solid wall tube, which differs from [Example 1] in that: in the nucleating masterbatch, the ultra-high molecular weight polyethylene is replaced by the modified ultra-high molecular weight polyethylene prepared in [Preparation Example 2-3].

[0087] [Example 6]

[0088] A flexible sealed self-locking polyethylene wound solid wall tube, which differs from [Example 1] in that: in the nucleating masterbatch, the ultra-high molecular weight polyethylene is replaced by the modified ultra-high molecular weight polyethylene prepared in [Preparation Example 2-4].

[0089] Comparative Example

[0090] [Comparative Example 1]

[0091] A flexible sealed self-locking polyethylene wound solid wall pipe, which differs from [Example 1] in that the metallocene polyethylene is replaced by ultra-high molecular weight polyethylene of equal mass.

[0092] [Comparative Example 2]

[0093] A flexible sealed self-locking polyethylene wound solid wall pipe, which differs from [Example 1] in that the ultra-high molecular weight polyethylene is replaced by metallocene polyethylene of equal mass.

[0094] [Comparative Example 3]

[0095] A flexible sealed self-locking polyethylene wound solid wall tube, which differs from [Example 1] in that: in the nucleating masterbatch, the ultra-high molecular weight polyethylene is replaced by the modified ultra-high molecular weight polyethylene prepared in [Preparation Example 2-5].

[0096] Performance testing

[0097] Sample preparation: Flexible sealed self-locking polyethylene wrapped solid wall pipes with an outer diameter of 400 mm and a wall thickness of 12.3 mm were prepared using the raw materials prepared in each embodiment and comparative example. During the preparation of the flexible sealed self-locking polyethylene wrapped solid wall pipes, the process conditions remained consistent.

[0098] 1. Molding Shrinkage: The shrinkage in the diameter direction of the raw materials used to prepare the flexible, sealed, self-locking polyethylene wound solid-wall tubes in each embodiment and comparative example was tested with reference to the standard GB / T 15585-1995, Determination of Injection Molding Shrinkage of Thermoplastics. Each set of samples was tested five times in parallel, and the shrinkage range was recorded.

[0099] 2. Wear resistance: Conduct wear resistance test according to QB / T 5101-2017, test method for wear resistance of plastic pipes, with the number of wear times being 5 million, and record the mass wear rate.

[0100] 3. Leakage Test: Three flexible, sealed, self-locking polyethylene wrapped solid-wall pipes from the same experimental group were connected using the same process. The pipe joints were tested for leakage at 20°C and 12.0 MPa for 100 hours. Ten samples were taken from each experimental group for testing, and no leakage at any connection point was considered acceptable.

[0101] 4. Wall Thickness Tolerance: Ten tubes prepared in each example and comparative example were randomly sampled. Wall thickness was measured at five equally spaced points along the length of each tube. The wall thickness tolerance at each point was calculated, and the wall thickness tolerance range for each point in the ten samples was recorded. The wall thickness tolerance at any point was considered satisfactory if it was less than or equal to 1.4 mm.

[0102] Among them, when the radial shrinkage rate and wall thickness tolerance are small and stable, the product quality is more stable and the assembly accuracy is higher.

[0103] Table 1

[0104]

[0105] Combining Example 1 with Comparative Examples 1-2 and the test data recorded in Table 1, it can be seen that the metallocene polyethylene in the nucleating masterbatch used in Comparative Example 1 is replaced by an ultra-high molecular weight polyethylene of equal mass, but the excessive ultra-high molecular weight polyethylene will cause the melt viscosity to be too high, making it difficult for the modified talc in the nucleating masterbatch to be evenly dispersed, thereby causing the radial shrinkage rate of the flexible sealing self-locking polyethylene wrapped solid wall pipe to fluctuate greatly and the wall thickness tolerance to fluctuate greatly, resulting in poor connection accuracy of the pipe socket and prone to water leakage. In Comparative Example 2, the ultra-high molecular weight polyethylene in the nucleating masterbatch is replaced by an equal amount of metallocene polyethylene, wherein, without adding ultra-high molecular weight polyethylene, the wear resistance of the pipe is reduced and the shrinkage rate is increased. At the same time, due to the viscosity difference between metallocene polyethylene and high-density polyethylene, it is also easy to cause large fluctuations in shrinkage rate and wall thickness tolerance between different pipes, and it is also easy to cause poor connection accuracy of the pipe socket, leading to water leakage.

[0106] Combining Example 1 with Examples 3-6 and the test data recorded in Table 1, it can be seen that the product of ultra-high molecular weight polyethylene modified by using a specific ratio of side chain monoacrylate silicone oil and polyethylene glycol to modify ultra-high molecular weight polyethylene is beneficial to improving the processing of the nucleating masterbatch and promoting the uniform mixing between the raw materials of the nucleating masterbatch. It can further reduce the wall thickness tolerance of the pipe while ensuring a low shrinkage rate of the pipe, which is beneficial to improving the wall thickness accuracy of the pipe, and at the same time will not significantly affect the wear resistance of the flexible sealing self-locking polyethylene wrapped solid wall pipe.

[0107] Combining Example 1 with Comparative Example 3 and the search data recorded in Table 1, it can be seen that after omitting polyethylene glycol in Comparative Example 3, the radial shrinkage fluctuation and wall thickness fluctuation of the pipe increase, which is not conducive to improving the connection accuracy of the pipe. At the same time, due to the decrease in wall thickness uniformity, the wear resistance of the pipe also decreases.

[0108] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A flexible, sealed, self-locking polyethylene wrapped solid wall pipe, characterized by: The flexible sealing self-locking polyethylene wrapped solid wall pipe is prepared by raw materials including 15-25wt% nucleating masterbatch and the balance high-density polyethylene, the nucleating masterbatch is obtained by melt plasticizing and granulating 28-32wt% metallocene polyethylene, 18-22wt% modified ultra-high molecular weight polyethylene and 50wt% modified talc, the modified talc is obtained by talc, silane coupling agent, aluminate coupling agent, stearic acid, olefin wax in a weight ratio of 100: (0.8-1.2): (0.8-1.2): (1.5-2.5): (1.5-2.5) uniformly mixed; The molecular weight of the metallocene polyethylene is 80,000-150,000; The raw materials for preparing the modified ultra-high molecular weight polyethylene include side chain monoacrylate silicone oil, polyethylene glycol, ultra-high molecular weight polyethylene and peroxidation initiator in a weight ratio of (8.2-9.6): (2-4): 100: (0.01-0.015); The molecular weight of the ultra-high molecular weight polyethylene is 4 million to 5 million; The structural formula of the side chain monoacrylate silicone oil is as follows: ； The value of n is 45-50, and the value of m is 1.

2. The flexible sealed self-locking polyethylene wound solid wall pipe according to claim 1, characterized in that: The mesh number of the talcum powder is 600-800 mesh, and the diameter-to-thickness ratio is 10-20.

3. The flexible sealed self-locking polyethylene wound solid wall pipe according to claim 1, characterized in that: The preparation method of the modified talcum powder is as follows: The talc powder is heated and stirred. When the temperature of the talc powder reaches 80-85° C., a silane coupling agent and an aluminate coupling agent are added and stirred. When the temperature of the talc powder reaches 90-95° C., stearic acid is added and stirred. When the temperature of the talc powder reaches 100-105° C., olefin wax is added and stirred until uniformly dispersed to obtain modified talc powder.

4. The flexible sealed self-locking polyethylene wound solid wall pipe according to claim 1, characterized in that: The polyethylene glycol is at least one of PEG6000 and PEG8000.

5. The flexible, sealed, self-locking polyethylene wound solid wall pipe according to any one of claims 1 to 4, characterized in that: The preparation method of the modified ultra-high molecular weight polyethylene comprises the following steps: After polyethylene glycol and ultra-high molecular weight polyethylene are uniformly melted at 180-190° C., side chain monoacrylate silicone oil and peroxidation initiator are added, and the temperature is maintained at 180-190° C. for grafting reaction to obtain modified ultra-high molecular weight polyethylene.

6. A method for preparing a flexible sealed self-locking polyethylene wound solid wall pipe according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. After the modified talc powder and ultra-high molecular weight polyethylene are uniformly melted at 180-190°C, metallocene polyethylene is added, and the temperature is maintained at 180-190°C for melting and plasticization, followed by extrusion and granulation to obtain a nucleating masterbatch; S2. Evenly mix the nucleating masterbatch and high-density polyethylene according to the ratio, feed them into the extruder, heat and melt the extruded billet at 180-190°C, wind the billet on a roller mold, cool it, and perform socket processing to obtain a flexible, sealed, self-locking polyethylene wound solid wall pipe.

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