PE-RTⅡ pipe and its preparation method and application

Abstract

The present invention discloses a PE-RTⅡ type pipe and its preparation method and application, and relates to the technical field of plastic pipes. It includes an anti-fouling and wear-resistant layer, which includes 80 to 120 parts of PE-RTⅡ type resin, 1 to 5 parts of polyoxymethylene, 0.5 to 4 parts of maleic anhydride graft copolymer, 1 to 10 parts of anti-adhesion polymer and 5 to 10 parts of anti-wear agent by weight. Maleic anhydride graft copolymer makes polyoxymethylene and PE-RTⅡ type resin more tightly combined. Polyoxymethylene and anti-wear agent work together to improve the wear resistance of the pipe. At the same time, polyoxymethylene can also work together with anti-adhesion polymer to improve the smoothness of the inner surface of the pipe, making it difficult for dirt to adhere to the inner surface of the pipe, reducing the blockage and contamination of the pipeline. At the same time, because the smoothness of the inner surface of the pipe is improved, the friction coefficient of the inner surface of the pipe is reduced, and the friction of the conveying medium in the pipe on the inner wall of the pipe is also reduced, which complements the anti-wear agent to form double protection.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic pipes, and in particular to a PE-RTⅡ pipe and a preparation method and application thereof. Background Art

[0002] Pipeline transportation is widely used in water supply, drainage, gas supply, heat supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial devices. In order to ensure the safe and long-term transportation of the transported medium, it is necessary to improve the various performances of the pipeline as much as possible to extend the service life and safety of the pipeline.

[0003] The ship system pipelines are designed to improve the ship's anti-sinking and stability, and to meet the normal living needs of crew members and passengers. There are many types of ship systems, including the water supply system and sewage system for supplying seawater and fresh water to the entire ship; the ballast water system for adjusting the ship's ballast; the bilge water discharge system for removing bilge water; and the compressed air system for providing compressed air to the entire ship. During the use of these piping systems, they are often affected by ship failures, collisions, or wear, corrosion, and blockage of the transported media, and fuel water and other leakage problems often occur due to pipeline ruptures and damages.

[0004] At present, most of the pipelines in ship systems are made of traditional galvanized steel pipes or seamless steel pipes, which are easily corroded, and the replacement and maintenance processes are relatively complicated and costly. Some pipelines are also made of plastic pipes made of polyethylene and polyvinyl chloride as the main materials, but there are still problems such as poor wear resistance and weak anti-fouling performance.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The object of the present invention is to provide a PE-RTⅡ type pipe and its preparation method and application, which has better wear resistance, anti-fouling and corrosion resistance, and is not prone to leakage, seepage and pipeline rupture.

[0007] The present invention is achieved in that:

[0008] In the first aspect, the present invention provides a PE-RTⅡ type pipe, including an anti-fouling and wear-resistant layer. Calculated by weight, the anti-fouling and wear-resistant layer includes 80 to 120 parts of PE-RTⅡ type resin, 1 to 5 parts of polyoxymethylene, 0.5 to 4 parts of maleic anhydride grafted copolymer, 1 to 10 parts of anti-adhesion polymer and 5 to 10 parts of wear resistance agent.

[0009] In an optional embodiment, the maleic anhydride grafted copolymer includes any one of a maleic anhydride grafted PE-RT copolymer and a maleic anhydride grafted PE copolymer, preferably a maleic anhydride grafted PE-RT copolymer.

[0010] In an optional embodiment, the anti-adhesion polymer includes an organic substance with a PE-RT resin as a matrix and containing fluorinated silicone or perfluoroalkyl functional groups.

[0011] In an optional embodiment, the wear-resistant agent includes any one of zirconium oxide ceramic powder and silicon nitride ceramic powder, and more preferably zirconium oxide ceramic powder.

[0012] Preferably, the particle size of the anti-wear agent is 1500-2500 mesh.

[0013] In an optional embodiment, the anti-fouling and wear-resistant layer further comprises, by weight, 1 to 10 parts of a silane coupling agent, 1 to 2 parts of white oil, and 0.1 to 2 parts of an antioxidant.

[0014] Preferably, the antioxidant includes at least one of antioxidant 1010 , antioxidant 1076 , and antioxidant 168 .

[0015] Preferably, the anti-fouling and wear-resistant layer further comprises 0 to 2 parts of pigment by weight.

[0016] In an optional embodiment, an outer tube is further included, and the anti-fouling and wear-resistant layer is located inside the outer tube, and the anti-fouling and wear-resistant layer is in close contact with the outer tube.

[0017] Preferably, the thickness ratio of the anti-fouling and wear-resistant layer to the outer tube is 0.8-1.2:1.8-2.2.

[0018] In an alternative embodiment, the material of the outer tube includes PE-RTⅡ resin.

[0019] Preferably, the material of the outer tube is PE-RTⅡ resin and pigment.

[0020] In a second aspect, the present invention provides a method for preparing a PE-RTⅡ type pipe as in any of the aforementioned embodiments, comprising mixing the raw materials of the anti-fouling and wear-resistant layer in proportion and then extruding it, or mixing the raw materials of the anti-fouling and wear-resistant layer and the outer pipe in proportion and then co-extruding it.

[0021] In an optional embodiment, the extrusion molding or the co-extrusion molding is performed by extrusion through a twin-screw extruder.

[0022] Preferably, the barrel temperature of the twin-screw extruder is 190-220°C, the head temperature is 200-230°C, and the temperature of the mixed raw material melt is ≤230°C.

[0023] In a third aspect, the present invention provides an application of a PE-RTⅡ pipe according to any one of the aforementioned embodiments in water supply and drainage pipelines.

[0024] The present invention has the following beneficial effects:

[0025] The present invention provides a PE-RTⅡ type pipe and its preparation method and application. PE-RTⅡ type resin is used as the main material of the pipe, and maleic anhydride graft copolymer is added to make the polyoxymethylene and PE-RTⅡ type resin more tightly combined. In the pipe, polyoxymethylene and anti-wear agent work together to improve the wear resistance of the pipe. At the same time, polyoxymethylene can also work together with anti-adhesion polymer to improve the smoothness of the inner surface of the pipe, making it difficult for dirt, shellfish / algae, plankton, etc. to adhere to the inner surface of the pipe, reducing the blockage and contamination of the pipeline. At the same time, because polyoxymethylene and anti-adhesion polymer improve the smoothness of the inner surface of the pipe, reduce the friction coefficient of the inner surface of the pipe, and also reduce the friction of the conveying medium in the pipe on the inner wall of the pipe, it complements the anti-wear agent to form double protection. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0027] In the first aspect, the present invention provides a PE-RTⅡ type pipe, including an anti-fouling and wear-resistant layer. Calculated by weight, the anti-fouling and wear-resistant layer includes 80 to 120 parts of PE-RTⅡ type resin, 1 to 5 parts of polyoxymethylene, 0.5 to 4 parts of maleic anhydride grafted copolymer, 1 to 10 parts of anti-adhesion polymer and 5 to 10 parts of wear resistance agent.

[0028] At present, during the use of pipeline systems, fuel water and other leakage problems often occur due to external failures, impacts or wear, corrosion, and blockage of the transported medium. In addition, most traditional pipelines are mainly based on traditional galvanized steel pipes or seamless steel pipes. The pipelines are easily corroded, and the replacement and maintenance processes are relatively complicated and costly. Some pipelines also have plastic pipelines with polyethylene and polyvinyl chloride as the main materials, but there are still problems such as poor wear resistance and weak anti-fouling properties of the pipelines. Based on this, the inventor proposes to use polyoxymethylene and anti-wear agents to improve the wear resistance of the pipe. At the same time, polyoxymethylene can also work with anti-adhesion polymers to improve the smoothness of the inner surface of the pipe, making it difficult for dirt, shellfish / algae, plankton, etc. to adhere to the inner surface of the pipe, reducing the blockage and contamination of the pipeline. At the same time, because polyoxymethylene and anti-adhesion polymers improve the smoothness of the inner surface of the pipe, reduce the friction coefficient of the inner surface of the pipe, and also reduce the friction of the inner wall of the pipe by the transported medium in the pipe, they complement each other with anti-wear agents to form double protection.

[0029] In an optional embodiment, the maleic anhydride grafted copolymer includes any one of maleic anhydride grafted PE-RT copolymer and maleic anhydride grafted PE copolymer, preferably maleic anhydride grafted PE-RT copolymer. Maleic anhydride has good adhesion. Maleic anhydride is grafted onto a resin matrix and then mixed with other raw materials of the pipe, which can effectively connect PE-RTⅡ type resin with polyoxymethylene, improve the compatibility of each raw material in the pipe, make polyoxymethylene and PE-RTⅡ type resin more closely combined, and achieve better wear resistance and anti-fouling effect.

[0030] In an optional embodiment, the anti-adhesion polymer includes an organic substance with a PE-RT resin as a matrix and containing fluorosilicone or perfluoroalkyl functional groups. By grafting fluorosilicone or perfluoroalkyl functional groups onto the PE-RT resin, the anti-adhesion polymer is improved in its ability to bind to the PE-RT II resin, while the fluorosilicone or perfluoroalkyl functional groups can also exert better anti-fouling properties and improve the surface smoothness of the pipe. Moreover, the anti-adhesion polymer itself is based on the PE-RT resin, and the addition does not affect the performance of the pipe, and has good compatibility.

[0031] Preferably, the anti-adhesion polymer can be a commercially available material that meets the above standards, or it can be a modified material obtained by grafting PE-RT resin with an organic substance containing fluorinated silicone or perfluoroalkyl functional groups. For example, the organic substance containing fluorinated silicone or perfluoroalkyl functional groups can be perfluorooctyltriethoxysilane (PFAS), as long as the fluorinated silicone or perfluoroalkyl functional groups can be grafted onto the resin material.

[0032] In an optional embodiment, the wear-resistant agent includes any one of zirconium oxide ceramic powder and silicon nitride ceramic powder, and more preferably zirconium oxide ceramic powder.

[0033] Preferably, in order to achieve a better dispersion effect of the anti-wear agent, the particle size of the anti-wear agent is 1500-2500 mesh. For example, the particle size of the anti-wear agent is 1500 mesh, 1700 mesh, 1900 mesh, 2100 mesh, 2300 mesh and 2500 mesh.

[0034] In an optional embodiment, the anti-fouling and wear-resistant layer further comprises, by weight, 1 to 10 parts of a silane coupling agent, 1 to 2 parts of white oil, and 0.1 to 2 parts of an antioxidant.

[0035] White oil can disperse the anti-wear agent evenly. The agglomeration of anti-wear agent on the wall causes uneven performance of the pipe, resulting in leakage, breakage and other problems.

[0036] Silane coupling agent can improve the bonding ability between the wear-resistant agent and PE-RTⅡ resin, so that the wear-resistant agent and the resin material are integrated and the wear resistance of the pipe is improved.

[0037] Preferably, the antioxidant includes at least one of antioxidant 1010 , antioxidant 1076 , and antioxidant 168 .

[0038] Preferably, the anti-fouling and wear-resistant layer further comprises 0 to 2 parts of pigment by weight.

[0039] In an optional embodiment, in order to reduce the manufacturing cost of the pipe, an outer pipe is further included, and the anti-fouling and wear-resistant layer is located inside the outer pipe, and the anti-fouling and wear-resistant layer is in close contact with the outer pipe.

[0040] Preferably, the thickness ratio of the anti-fouling and wear-resistant layer to the outer tube is 0.8-1.2:1.8-2.2.

[0041] In an alternative embodiment, the material of the outer tube includes PE-RTⅡ resin.

[0042] Preferably, the material of the outer tube is PE-RTⅡ resin and pigment.

[0043] In a second aspect, the present invention provides a method for preparing a PE-RTⅡ pipe according to any one of the aforementioned embodiments, comprising mixing the raw materials of the anti-fouling and wear-resistant layer in proportion and then extruding, or mixing the raw materials of the anti-fouling and wear-resistant layer and the outer pipe in proportion and then co-extruding. Since PE-RTⅡ resin has better plasticity and better adhesion at higher temperatures, when co-extruding, the outer pipe and the anti-fouling and wear-resistant layer can be more tightly bonded, thereby obtaining a PE-RTⅡ pipe with better performance.

[0044] In an optional embodiment, the extrusion molding or the co-extrusion molding is performed by extrusion through a twin-screw extruder.

[0045] Preferably, the barrel temperature of the twin-screw extruder is 190-220°C, the head temperature is 200-230°C, and the temperature of the mixed raw material melt is ≤230°C.

[0046] In a third aspect, the present invention provides an application of a PE-RTⅡ pipe according to any one of the aforementioned embodiments in water supply and drainage pipelines.

[0047] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0048] Example 1

[0049] This embodiment provides a PE-RTⅡ type pipe, which includes an inner pipe with an anti-fouling and wear-resistant layer and an outer pipe, and the thickness ratio of the anti-fouling and wear-resistant layer to the outer pipe is 1:2.

[0050] Among them, the raw material composition of the anti-fouling and wear-resistant layer is: 100 parts of PE-RTⅡ type resin, 1.5 parts of antioxidant, 10 parts of silane coupling agent, 2 parts of white oil, 5 parts of polyformaldehyde, 4 parts of maleic anhydride grafted copolymer, 10 parts of anti-adhesion polymer, 10 parts of wear-resistant agent and 2 parts of pigment.

[0051] The wear-resistant agent is zirconium oxide ceramic powder with a particle size of 2100 meshes; and the antioxidant is antioxidant 1010.

[0052] The raw material composition of the outer tube is: 100 parts of PE-RTⅡ type resin and 2 parts of pigment.

[0053] The preparation method is as follows:

[0054] The raw materials of the anti-fouling and wear-resistant layer and the raw materials of the outer tube are mixed and mixed in proportion, and added to the twin-screw extruder for co-extrusion. The barrel temperature of the twin-screw extruder is 190-220°C, the head temperature is 200-230°C, and the temperature of the mixed raw material melt is ≤230°C. The extruded material is passed through a double-layer co-extrusion die to obtain a double-layer tube embryo, which is cut after shaping and cooling to obtain PE-RTⅡ type pipe.

[0055] Example 2

[0056] This embodiment provides a PE-RTⅡ type pipe, which includes an inner pipe with an anti-fouling and wear-resistant layer and an outer pipe, and the thickness ratio of the anti-fouling and wear-resistant layer to the outer pipe is 1:2.

[0057] Among them, the raw material composition of the anti-fouling and wear-resistant layer is: 100 parts of PE-RTⅡ type resin, 0.5 parts of antioxidant, 1 part of silane coupling agent, 1 part of white oil, 1 part of polyformaldehyde, 0.5 parts of maleic anhydride graft copolymer, 2 parts of anti-adhesion polymer, 5 parts of wear resistance agent and 0 parts of pigment.

[0058] The wear-resistant agent is zirconium oxide ceramic powder with a particle size of 2100 meshes; and the antioxidant is antioxidant 1010.

[0059] The raw material composition of the outer tube is: 100 parts of PE-RTⅡ type resin and 2 parts of pigment.

[0060] The preparation method is as follows:

[0061] The raw materials of the anti-fouling and wear-resistant layer and the raw materials of the outer tube are mixed and mixed in proportion, and added to the twin-screw extruder for co-extrusion. The barrel temperature of the twin-screw extruder is 190-220°C, the head temperature is 200-230°C, and the temperature of the mixed raw material melt is ≤230°C. The extruded material is passed through a double-layer co-extrusion die to obtain a double-layer tube embryo, which is cut after shaping and cooling to obtain PE-RTⅡ type pipe.

[0062] Example 3

[0063] This embodiment provides a PE-RTⅡ type pipe, which includes an inner pipe with an anti-fouling and wear-resistant layer and an outer pipe, and the thickness ratio of the anti-fouling and wear-resistant layer to the outer pipe is 1:2.

[0064] Among them, the raw material composition of the anti-fouling and wear-resistant layer is: 100 parts of PE-RTⅡ type resin, 1 part of antioxidant, 6 parts of silane coupling agent, 1.5 parts of white oil, 3 parts of polyformaldehyde, 2.5 parts of maleic anhydride grafted copolymer, 6 parts of anti-adhesion polymer, 8 parts of wear resistance agent and 1 part of pigment.

[0065] The wear-resistant agent is zirconium oxide ceramic powder with a particle size of 2100 meshes; and the antioxidant is antioxidant 1010.

[0066] The raw material composition of the outer tube is: 100 parts of PE-RTⅡ type resin and 2 parts of pigment.

[0067] The preparation method is as follows:

[0068] The raw materials of the anti-fouling and wear-resistant layer and the raw materials of the outer tube are mixed and mixed in proportion, and added to the twin-screw extruder for co-extrusion. The barrel temperature of the twin-screw extruder is 190-220°C, the head temperature is 200-230°C, and the temperature of the mixed raw material melt is ≤230°C. The extruded material is passed through a double-layer co-extrusion die to obtain a double-layer tube embryo, which is cut after shaping and cooling to obtain PE-RTⅡ type pipe.

[0069] Example 4

[0070] This embodiment provides a PE-RTⅡ type pipe, which includes an anti-fouling and wear-resistant layer.

[0071] Among them, the raw material composition of the anti-fouling and wear-resistant layer is: 100 parts of PE-RTⅡ type resin, 1.2 parts of antioxidant, 7 parts of silane coupling agent, 1.5 parts of white oil, 3 parts of polyformaldehyde, 3 parts of maleic anhydride grafted copolymer, 6 parts of anti-adhesion polymer, 7 parts of wear resistance agent and 2 parts of pigment.

[0072] The wear-resistant agent is zirconium oxide ceramic powder with a particle size of 2100 meshes; and the antioxidant is antioxidant 1010.

[0073] The preparation method is as follows:

[0074] The raw materials of the anti-fouling and wear-resistant layer and the raw materials of the outer tube are mixed and mixed in proportion, and added to the twin-screw extruder for co-extrusion. The barrel temperature of the twin-screw extruder is 190-220°C, the head temperature is 200-230°C, and the temperature of the mixed raw material melt is ≤230°C. The extruded material is passed through a double-layer co-extrusion die to obtain a double-layer tube embryo, which is cut after shaping and cooling to obtain PE-RTⅡ type pipe.

[0075] Comparative Example 1

[0076] This comparative example provides a common PE-RTⅡ type pipe, whose formula includes: 100 parts of the same PE-RTⅡ type resin as in Example 1.

[0077] Comparative Example 2

[0078] This comparative example provides a PE-RTⅡ type pipe, which includes an inner pipe with an anti-fouling and wear-resistant layer and an outer pipe, and the thickness ratio of the anti-fouling and wear-resistant layer to the outer pipe is 1:2.

[0079] Among them, the raw material composition of the anti-fouling and wear-resistant layer is: 100 parts of PE-RTⅡ type resin, 1.5 parts of antioxidant, 10 parts of silane coupling agent, 2 parts of white oil, 5 parts of polyformaldehyde, 10 parts of anti-adhesion polymer, 10 parts of wear-resistant agent and 2 parts of pigment.

[0080] The raw material composition of the outer tube is: 100 parts of PE-RTⅡ type resin and 2 parts of pigment.

[0081] The preparation method of the pipe is the same as that of Example 1.

[0082] Comparative Example 3

[0083] PE-RTⅡ type resin 100 parts of PE-RTⅡ type resin, 1.5 parts of antioxidant, 10 parts of silane coupling agent, 2 parts of white oil, 5 parts of polyoxymethylene, 4 parts of maleic anhydride graft copolymer, 10 parts of wear resistance agent and 2 parts of pigment.

[0084] Test Example 1

[0085] The performance of the PE-RTⅡ pipes obtained in Examples 1 to 3 and Comparative Examples 1 to 3 was tested, and the results shown in Table 1 were obtained.

[0086] Among them, the detection method of mortar wear index refers to GB / T3960-2016. The hydrostatic performance test standard refers to GB / T28799.2-2020, and the anti-biofouling test standard refers to GB / T 21353 2008.

[0087] Table 1 Performance of PE-RTⅡ pipe

[0088]

[0089]

[0090] As can be seen from Table 1, the PE-RTⅡ pipe provided in the embodiment of the present invention has a lower friction coefficient, a low mortar wear index, and good friction resistance. At the same time, the PE-RTⅡ pipe provided in this embodiment has a small algae growth area inside and a high surface smoothness, which avoids pipeline blockage, leakage and other phenomena. Comparative Example 2 does not add maleic anhydride solubilizer, polyoxymethylene is incompatible with PE-RT, and the interface bonding is poor. The modified PE-RT material cannot achieve a good effect. Comparative Example 3 does not add an anti-adhesion polymer, which leads to an increase in its friction coefficient and affects its wear resistance.

[0091] The embodiment of the present invention provides a PE-RTⅡ pipe and a preparation method and application thereof, which has at least the following advantages:

[0092] 1. Polyoxymethylene and anti-wear agents work together to improve the wear resistance of pipes. At the same time, polyoxymethylene can also work together with anti-adhesion polymers to improve the smoothness of the inner surface of the pipe, making it difficult for dirt, shellfish / algae, plankton, etc. to adhere to the inner surface of the pipe, reducing the blockage and contamination of the pipeline. At the same time, because polyoxymethylene and anti-adhesion polymers improve the smoothness of the inner surface of the pipe, reduce the friction coefficient of the inner surface of the pipe, and also reduce the friction of the conveying medium in the pipe on the inner wall of the pipe, it complements the anti-wear agent to form a double protection.

[0093] 2. Maleic anhydride has good adhesion. By grafting maleic anhydride onto the resin matrix and then mixing it with other raw materials of the pipe, PE-RTⅡ resin and polyoxymethylene can be connected very well, thereby improving the compatibility of the raw materials in the pipe and making polyoxymethylene and PE-RTⅡ resin more closely combined, thus achieving better wear resistance and anti-fouling effects.

[0094] 3. By grafting fluorosilicone or perfluoroalkyl functional groups onto PE-RT resin, the ability of the anti-adhesion polymer to bind to PE-RTⅡ resin is improved, while the fluorosilicone or perfluoroalkyl functional groups can also exert better anti-fouling properties and improve the surface smoothness of the pipe. The anti-adhesion polymer itself is based on PE-RT resin, and the addition does not affect the performance of the pipe, and has good compatibility.

[0095] 4. White oil can disperse the wear-resistant agent evenly. The agglomeration of wear-resistant agent on the wall will cause uneven performance of the pipe, resulting in leakage, breakage and other problems.

[0096] 5. Silane coupling agent can improve the bonding ability between the wear-resistant agent and PE-RTⅡ resin, so that the wear-resistant agent and the resin material are integrated and the wear resistance of the pipe is improved.

[0097] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PE-RT II type pipe, characterized in that: It comprises an anti-fouling and wear-resistant layer and an outer tube, wherein the anti-fouling and wear-resistant layer is located inside the outer tube, and the anti-fouling and wear-resistant layer is in close contact with the outer tube; the thickness ratio of the anti-fouling and wear-resistant layer to the outer tube is 1:2; In parts by weight, the anti-fouling and wear-resistant layer comprises 80-120 parts of PE-RTⅡ type resin, 1-5 parts of polyoxymethylene, 0.5-4 parts of maleic anhydride grafted PE-RT copolymer, 1-10 parts of anti-adhesion polymer and 5-10 parts of wear-resistant agent; The anti-adhesion polymer includes an organic substance with a PE-RT resin as a matrix and containing fluorinated silicone or perfluoroalkyl functional groups; The wear-resistant agent includes any one of zirconium oxide ceramic powder and silicon nitride ceramic powder.

2. The PE-RT II type pipe according to claim 1, characterized in that: The wear-resistant agent is zirconium oxide ceramic powder.

3. The PE-RT II type pipe according to claim 2, characterized in that: The particle size of the wear-resistant agent is 1500-2500 meshes.

4. The PE-RT II type pipe according to claim 2 or 3, characterized in that: In parts by weight, the anti-fouling and wear-resistant layer further comprises 1 to 10 parts of a silane coupling agent, 1 to 2 parts of white oil and 0.1 to 2 parts of an antioxidant; The antioxidant includes at least one of the antioxidant 1010 , the antioxidant 1076 , and the antioxidant 168 .

5. The PE-RT II pipe according to claim 1, characterized in that: The material of the outer tube includes PE-RT Ⅱ resin.

6. The PE-RT II pipe according to claim 5, characterized in that: The material of the outer tube is PE-RT Ⅱ resin and pigment.

7. A method for preparing a PE-RT II type pipe according to any one of claims 1 to 6, characterized in that: The method comprises mixing the raw materials of the anti-fouling and wear-resistant layer in proportion and then extruding and molding, or respectively mixing the raw materials of the anti-fouling and wear-resistant layer and the outer tube in proportion and then co-extruding and molding.

8. The preparation method according to claim 7, characterized in that: The extrusion molding or co-extrusion molding is extruded by a twin-screw extruder; The barrel temperature of the twin-screw extruder is 190-220°C, the head temperature is 200-230°C, and the temperature of the mixed raw material melt is ≤230°C.

9. Use of the PE-RT II pipe material as claimed in any one of claims 1 to 6 in water supply and drainage pipelines.

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