Self-cleaning antibacterial pipe with reinforcing rib structure and preparation method of self-cleaning antibacterial pipe

Abstract

The invention discloses a self-cleaning antibacterial pipe with a reinforcing rib structure and a preparation method of the self-cleaning antibacterial pipe, and belongs to the technical field of pipes. The self-cleaning antibacterial pipe comprises the following components in parts by weight: 80-120 parts of polyvinyl chloride resin, 3-5 parts of a heat stabilizer, 30-50 parts of self-cleaning antibacterial filler, 40-50 parts of a plasticizer, 2-3 parts of a processing aid and 0.5-1 part of an antioxidant. By adding the self-cleaning antibacterial filler into the pipe, the hydrophobic, antibacterial and mechanical properties of the pipe can be improved, pollutants and bacteria can be effectively prevented from being accumulated and propagated on the surface of the pipe, and the self-cleaning and antibacterial properties of the pipe are remarkably improved, so that the service life is prolonged, and the pipeline is kept sanitary.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe materials, and particularly relates to a self-cleaning antibacterial pipe with a reinforcing rib structure and a preparation method thereof. Background Art

[0002] As an important material for fluid transportation and structural support, pipes have been widely used in fields such as municipal water supply, building drainage, medical and health, and food processing. With the continuous improvement of environmental sanitation and service life requirements, many problems exposed by traditional pipes during actual use have become increasingly prominent. For example, the inner walls of ordinary plastic or metal pipes are in long-term contact with water, air, and organic substances, which are extremely prone to the growth of bacteria and microorganisms, and dirt will also be generated in a humid environment, resulting in pipe blockage, fluid pollution, shortened service life, and even secondary pollution or bacterial infection incidents, posing potential hazards to user health and pipeline safety.

[0003] Chinese Patent Document CN114889227A discloses an anti-scaling PVC pipe and a preparation method thereof, including a PVC composite layer as the outer layer and an anti-scaling layer as the inner layer. The anti-scaling layer is a UHMWPE / CPE / PVC composite material, including the following components in parts by weight: 100 parts of PVC resin powder, 3.0 - 5.0 parts of calcium zinc stabilizer, 10 - 20 parts of CPE, 0.5 - 2.0 parts of impact toughening agent, 3 - 15 parts of calcium carbonate, 0.3 - 0.5 parts of lubricant, 0.1 - 1.25 parts of polyethylene wax, 0.6 - 5.0 parts of processing aid, 5 - 25 parts of UHMWPE powder, and 0.3 - 1.5 parts of plasticizer. The anti-scaling PVC pipe prepared by this invention has good self-cleaning and anti-scaling effects, can effectively reduce the adhesion and scaling of dirt on the inner wall of the PVC pipe; and the preparation process is simple and the price is low, which is suitable for large-scale industrial promotion. The anti-scaling and self-cleaning properties of this patent mainly rely on the low surface energy and compatibility regulation of materials at the physical level, lacking the function of actively decomposing organic pollutants or antibacterial, and it is difficult to cope with pollution problems in complex environments such as microbial adhesion and biofouling. Summary of the Invention

[0004] The main object of the present invention is to propose a self-cleaning antibacterial pipe with a reinforcing rib structure and a preparation method thereof. By adding self-cleaning antibacterial fillers to the pipe, the hydrophobic, antibacterial, and mechanical properties of the pipe can be improved, effectively preventing the accumulation and reproduction of pollutants and bacteria on the pipe surface, significantly enhancing its self-cleaning antibacterial performance, thereby extending the service life and maintaining pipeline hygiene.

[0005] To achieve the above object, the present invention provides a self-cleaning antibacterial pipe with a reinforcing rib structure, which comprises the following components in parts by weight: 80-120 parts of polyvinyl chloride resin, 3-5 parts of heat stabilizer, 30-50 parts of self-cleaning antibacterial filler, 40-50 parts of plasticizer, 2-3 parts of processing aid, and 0.5-1 part of antioxidant.

[0006] Preferably, the heat stabilizer is one of calcium-zinc composite stabilizer, metal soap heat stabilizer, and organotin heat stabilizer.

[0007] Preferably, the preparation method of the self-cleaning antibacterial filler comprises the following steps: S1. Disperse sepiolite in an aqueous zinc salt solution, then adjust the pH value with an alkali, mix evenly and carry out a hydrothermal reaction. After the reaction is completed, collect the solid product, wash, dry, and grind it to obtain a composite powder. S2. Add the composite powder into an ethanol aqueous solution, ultrasonically disperse it, add vinyltriethoxysilane, heat and react, filter, collect the solid product, wash and dry it, then disperse it in dry N,N-dimethylformamide, and add an acid anhydride containing a carbon-carbon double bond. S3. Add the surface-modified composite powder into dimethyl sulfoxide, add 4-vinylphenylacetic acid, tridecafluoroheptanoic acid, N-hydroxysuccinimide, and 1-ethyl-(3-dimethylaminopropyl)carbodiimide, adjust the pH value to weakly acidic, stir and react. Wash and dry the solid product, then add it into N,N-dimethylformamide, add α-phellandrene and ammonium persulfate. After the reaction is completed, filter, collect the solid product, wash and dry it to obtain the self-cleaning antibacterial filler.

[0008] Preferably, in step S1, the zinc salt is at least one of zinc chloride, zinc nitrate, and zinc acetate; the concentration of the aqueous zinc salt solution is 0.2-0.5 mol / L; the mass ratio of sepiolite to the aqueous zinc salt solution is 2-3:10-20; the hydrothermal reaction temperature is 150-200 °C, and the reaction time is 8-15 h.

[0009] Preferably, in step S2, the mass ratio of the composite powder to KH550 is 15-25:3-5; the heating reaction temperature is 40-60 °C, and the heating time is 4-6 h.

[0010] Preferably, in step S3, the mass ratio of the surface-modified composite powder, 4-vinylphenylacetic acid, tridecafluoroheptanoic acid, N-hydroxysuccinimide, 1-ethyl-(3-dimethylaminopropyl)carbodiimide, α-phellandrene, and ammonium persulfate is 10-20:4-6:4-6:2-4:2-4:3-5:0.5-1.5.

[0011] Nano-zinc oxide is a self-cleaning antibacterial material with photocatalytic properties. It can decompose organic pollutants under ultraviolet light irradiation to achieve self-cleaning antibacterial effects. By loading it with sepiolite, the agglomeration of nano-zinc oxide particles can be effectively prevented, and the contact area with subsequent reactants can be increased; by grafting 4-vinylphenylacetic acid and tridecafluoroheptanoic acid, on the one hand, the hydrophobic properties of the self-cleaning antibacterial filler can be improved, and on the other hand, carbon-carbon double bonds can be introduced. By further grafting the antibacterial agent α-phellandrene, the antibacterial performance of the pipe is improved, which can effectively inhibit the growth of microorganisms, reduce bacterial growth, and even play self-cleaning antibacterial properties without sunlight irradiation; through grafting modification, the self-cleaning antibacterial filler is more likely to interpenetrate and entangle with other materials, which is beneficial to preventing it from precipitating from the matrix during the processing of PVC resin and improving the mechanical properties of PVC resin.

[0012] Preferably, the plasticizer is at least one of glycerol ester, epoxidized soybean oil, diisobutyl phthalate, bis-ester adipate, dioctyl phthalate, and diphenyl phthalate.

[0013] Preferably, the processing aid is ACR401.

[0014] Preferably, the antioxidant is at least one of distearyl thiodipropionate, pentaerythritol [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl) phosphite, butylated hydroxyanisole, and butylated hydroxytoluene.

[0015] The present invention also discloses a preparation method of the self-cleaning antibacterial pipe with a reinforcing rib structure, including the following steps: Mix polyvinyl chloride resin, heat stabilizer, self-cleaning antibacterial filler, plasticizer, processing aid, and antioxidant evenly, then place them in an extruder for extrusion granulation, and then further process through a twin-screw extruder. After extrusion through an extrusion die head and a ribbed pipe forming machine, it is extruded, cooled, and cut to a fixed length to obtain a self-cleaning antibacterial pipe with a reinforcing rib structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting reinforcing ribs on the outer wall of the pipe, the present invention can significantly enhance the ring stiffness and modulus of the pipe, enabling it to withstand greater external loads and being applicable to occasions with high strength requirements; moreover, the reinforcing rib structure on the outer wall can effectively disperse the externally applied pressure, reduce the risk of pipe deformation, and ensure the normal operation of the water supply and drainage system; by adding a self-cleaning antibacterial filler, the hydrophobic and antibacterial properties of the pipe can be improved, and the self-cleaning antibacterial characteristics can be exerted under both sunny and non-sunny conditions, endowing the pipe with excellent self-cleaning ability, effectively reducing the growth of surface dirt and bacteria, further extending the service life of the pipe and enhancing its hygienic safety; 2. The preparation of the self-cleaning antibacterial filler of the present invention first involves loading nano-zinc oxide with sepiolite to obtain a composite powder, then treating the surface of the composite powder with KH550 to introduce amino groups, and then reacting the amino groups with 4-vinylphenylacetic acid and tridecafluoroheptanoic acid to graft 4-vinylphenylacetic acid and tridecafluoroheptanoic acid onto the surface of the composite powder. On the one hand, it can improve the hydrophobic performance of the material, and on the other hand, it can introduce carbon-carbon double bonds. Finally, the hydrophobic antibacterial agent α-phellandrene is grafted onto the composite powder through the reaction of the carbon-carbon double bonds with α-phellandrene. The self-cleaning antibacterial filler obtained through two grafting steps binds firmly to the PVC resin matrix, can inhibit the migration and precipitation of the filler, significantly improve the mechanical properties and durability of the pipe, making its comprehensive performance more excellent and suitable for application scenarios with high requirements for cleanliness and hygiene safety. Detailed implementation mode

[0017] To avoid repetition, unless otherwise specified, the items used in the following examples are all commercially available products, and the methods used are all conventional methods unless otherwise specified.

[0018] The sources of some raw materials used in the present invention are as follows: Polyvinyl chloride resin, with the brand number SG-5, is purchased from Yuyao Shuoguo Plasticizing Co., Ltd.

[0019] Sepiolite, 325 mesh, with an MgO content of 21-25 wt%, is purchased from Lingshou Hongrun Mineral Products Processing Factory.

[0020] Calcium-zinc composite stabilizer, with the product number SC-1015, is purchased from Shandong Sancheng New Materials Technology Co., Ltd.

[0021] ACR401 is purchased from Kunshan Majisen Composite Materials Co., Ltd.

[0022] Example 1

[0023] A preparation method of a self-cleaning antibacterial pipe with a reinforcing rib structure includes the following steps: Mix 100 g of polyvinyl chloride resin, 4.2 g of calcium-zinc composite stabilizer, 40 g of self-cleaning antibacterial filler, 45.5 g of dioctyl phthalate, 2.3 g of ACR401, and 0.8 g of distearyl thiodipropionate evenly, then place them in an extruder for extrusion granulation, and then further process through a twin-screw extruder, and extrude, cool, and cut to a fixed length through an extrusion die head and a ribbed pipe forming machine to obtain a self-cleaning antibacterial pipe with a reinforcing rib structure.

[0024] The preparation method of the self-cleaning antibacterial filler includes the following steps: S1. Disperse 25 g of sepiolite in 158 g of 0.3 mol / L zinc chloride aqueous solution, and adjust the pH value to 9 with 1 mol / L sodium hydroxide aqueous solution. Then, carry out hydrothermal reaction in a high-pressure reaction kettle. The hydrothermal reaction temperature is 180 °C, and the reaction time is 12 h. After the reaction is completed, cool it, centrifuge it, collect the solid, wash, dry and grind it to obtain a composite powder; S2. Add 20 g of the composite powder to 200 mL of 50 wt% ethanol aqueous solution, ultrasonically disperse it, add 4.2 g of KH550, and heat and react at 50 °C for 4 h. Filter it, collect the solid, wash and dry it to obtain a surface-modified composite powder; S3. Add 15 g of the surface-modified composite powder to 200 mL of dimethyl sulfoxide, add 5.3 g of 4-vinylphenylacetic acid, 4.8 g of tridecafluoroheptanoic acid, 3 g of N-hydroxysuccinimide and 3 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide. Adjust the pH value to 5 with 36 wt% acetic acid aqueous solution, stir and react at 70 °C for 7 h. Filter and collect the solid product. After washing and drying the solid product, add it to 200 mL of N,N-dimethylformamide, add 4.8 g of α-phellandrene and 1 g of ammonium persulfate, and heat and react at 80 °C for 6 h. After the reaction is completed, collect the solid product, wash and dry it to obtain a self-cleaning antibacterial filler.

[0025] Example 2

[0026] A preparation method of a self-cleaning antibacterial pipe with a reinforcing rib structure, comprising the following steps: Mix 80 g of polyvinyl chloride resin, 3 g of calcium-zinc composite stabilizer, 30 g of self-cleaning antibacterial filler, 40 g of dioctyl phthalate, 2 g of ACR401, and 0.5 g of distearyl thiodipropionate evenly, and then place them in an extruder for extrusion granulation. Then, further process them through a twin-screw extruder, and extrude, cool and cut to a fixed length through an extrusion die head and a ribbed pipe forming machine to obtain a self-cleaning antibacterial pipe with a reinforcing rib structure.

[0027] The preparation method of the self-cleaning antibacterial filler comprises the following steps: S1. Disperse 20 g of sepiolite in 100 g of 0.2 mol / L zinc chloride aqueous solution, and adjust the pH value to 10 with 1 mol / L sodium hydroxide aqueous solution. Then, carry out hydrothermal reaction in a high-pressure reaction kettle. The hydrothermal reaction temperature is 150 °C, and the reaction time is 16 h. After the reaction is completed, cool it, centrifuge it, collect the solid, wash, dry and grind it to obtain a composite powder; S2. Add 15 g of the composite powder to 200 mL of 50 wt% ethanol aqueous solution, ultrasonically disperse it, add 3 g of KH550, and heat and react at 40 °C for 6 h. Filter it, collect the solid, wash and dry it to obtain a surface-modified composite powder; S3. Add 10 g of the surface-modified composite powder to 200 mL of dimethyl sulfoxide, add 4 g of 4-vinylphenylacetic acid, 4.1 g of tridecafluoroheptanoic acid, 2 g of N-hydroxysuccinimide, and 2 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide. Adjust the pH value to 4 with 36 wt% aqueous acetic acid solution, stir and react at 60 °C for 8 h, filter to collect the solid product, wash and dry the solid product, then add it to 200 mL of N,N-dimethylformamide, add 3.8 g of α-phellandrene and 0.6 g of ammonium persulfate, and heat and react at 80 °C for 6 h. After the reaction is completed, collect the solid product, wash and dry it to obtain the self-cleaning antibacterial filler.

[0028] Example 3

[0029] A preparation method of a self-cleaning antibacterial pipe with a reinforcing rib structure, comprising the following steps: Mix 120 g of polyvinyl chloride resin, 5 g of calcium-zinc composite stabilizer, 50 g of self-cleaning antibacterial filler, 50 g of dioctyl phthalate, 3 g of ACR401, and 1 g of distearyl thiodipropionate evenly, then place them in an extruder for extrusion granulation, and then further process through a twin-screw extruder, extrude, form, cool, and cut to a fixed length through an extrusion die head and a ribbed pipe forming machine to obtain a self-cleaning antibacterial pipe with a reinforcing rib structure.

[0030] The preparation method of the self-cleaning antibacterial filler comprises the following steps: S1. Disperse 30 g of sepiolite in 200 g of 0.5 mol / L zinc chloride aqueous solution, adjust the pH value to 10 with 1 mol / L sodium hydroxide aqueous solution, then carry out hydrothermal reaction in a high-pressure reaction kettle, the hydrothermal reaction temperature is 200 °C, the reaction time is 8 h, cool after the reaction is completed, centrifuge, collect the solid, wash, dry, and grind to obtain the composite powder; S2. Add 25 g of the composite powder to 200 mL of 50 wt% ethanol aqueous solution, ultrasonically disperse it, add 5 g of KH550, heat and react at 60 °C for 4 h, filter, collect the solid, wash and dry it to obtain the surface-modified composite powder; S3. Add 20 g of the surface-modified composite powder to 200 mL of dimethyl sulfoxide, add 6 g of 4-vinylphenylacetic acid, 5.8 g of tridecafluoroheptanoic acid, 4 g of N-hydroxysuccinimide, and 4 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide. Adjust the pH value to 4 with 36 wt% aqueous acetic acid solution, stir and react at 80 °C for 6 h, filter to collect the solid product, wash and dry the solid product, then add it to 200 mL of N,N-dimethylformamide, add 5 g of α-phellandrene and 1.5 g of ammonium persulfate, and heat and react at 80 °C for 6 h. After the reaction is completed, collect the solid product, wash and dry it to obtain the self-cleaning antibacterial filler.

[0031] Comparative Example 1 A preparation method of a self-cleaning antibacterial pipe with a reinforcing rib structure, comprising the following steps: Mix 100 g of polyvinyl chloride resin, 4.2 g of calcium-zinc composite stabilizer, 40 g of self-cleaning antibacterial filler, 45.5 g of dioctyl phthalate, 2.3 g of ACR401, and 0.8 g of distearyl thiodipropionate evenly, then place them in an extruder for extrusion granulation, and then further process through a twin-screw extruder. After extrusion through an extrusion die head and a ribbed pipe forming machine, cooling, and fixed-length cutting, a self-cleaning antibacterial pipe with a reinforcing rib structure is obtained.

[0032] The preparation method of the self-cleaning antibacterial filler comprises the following steps: S1. Disperse 25 g of sepiolite in 158 g of 0.3 mol / L zinc chloride aqueous solution, adjust the pH value to 9 with 1 mol / L sodium hydroxide aqueous solution, then carry out hydrothermal reaction in a high-pressure reaction kettle. The hydrothermal reaction temperature is 180 °C, the reaction time is 12 h. After the reaction is completed, cool, centrifuge, collect the solid matter, wash, dry, and grind to obtain a composite powder; S2. Add 20 g of the composite powder to 200 mL of 50 wt% ethanol aqueous solution, ultrasonically disperse, add 4.2 g of KH550, heat and react at 50 °C for 4 h, filter, and collect the solid matter, wash, and dry to obtain a surface-modified composite powder; S3. Add 15 g of the surface-modified composite powder to 200 mL of dimethyl sulfoxide, add 5.3 g of 4-vinylphenylacetic acid, 4.8 g of tridecafluoroheptanoic acid, 3 g of N-hydroxysuccinimide, and 3 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide, adjust the pH value to 5 with 36 wt% acetic acid aqueous solution, stir and react at 70 °C for 7 h, filter, collect the solid product, wash, and dry to obtain the self-cleaning antibacterial filler.

[0033] The difference between Comparative Example 1 and Example 1 is that α-phellandrene is not grafted during the preparation process of the self-cleaning antibacterial filler.

[0034] Comparative Example 2 A preparation method of a self-cleaning antibacterial pipe with a reinforcing rib structure, comprising the following steps: Mix 100 g of polyvinyl chloride resin, 4.2 g of calcium-zinc composite stabilizer, 40 g of self-cleaning antibacterial filler, 45.5 g of dioctyl phthalate, 2.3 g of ACR401, and 0.8 g of distearyl thiodipropionate evenly, then place them in an extruder for extrusion granulation, and then further process through a twin-screw extruder. After extrusion through an extrusion die head and a ribbed pipe forming machine, cooling, and fixed-length cutting, a self-cleaning antibacterial pipe with a reinforcing rib structure is obtained.

[0035] The preparation method of the self-cleaning antibacterial filler comprises the following steps: S1. Disperse 25 g of sepiolite in 158 g of 0.3 mol / L zinc chloride aqueous solution, and adjust the pH value to 9 with 1 mol / L sodium hydroxide aqueous solution. Then, carry out hydrothermal reaction in a high-pressure reactor. The hydrothermal reaction temperature is 180 °C, and the reaction time is 12 h. After the reaction is completed, cool it, centrifuge it, collect the solid, wash, dry, and grind it to obtain the composite powder. S2. Add 20 g of the composite powder to 200 mL of 50 wt% ethanol aqueous solution, ultrasonically disperse it, add 4.2 g of KH550, heat and react at 50 °C for 4 h, filter it, and collect the solid, wash, and dry it to obtain the surface-modified composite powder. S3. Mix 15 g of the surface-modified composite powder and 4.8 g of α-phellandrene evenly to obtain the self-cleaning antibacterial filler.

[0036] The difference between Comparative Example 2 and Example 1 is that the self-cleaning antibacterial filler is a mixture of 15 g of the surface-modified composite powder and 4.8 g of α-phellandrene.

[0037] Comparative Example 3 A preparation method of a self-cleaning antibacterial pipe with a reinforcing rib structure includes the following steps: Mix 100 g of polyvinyl chloride resin, 4.2 g of calcium-zinc composite stabilizer, 40 g of self-cleaning antibacterial filler, 45.5 g of dioctyl phthalate, 2.3 g of ACR401, and 0.8 g of distearyl thiodipropionate evenly, then place them in an extruder for extrusion granulation, and then further process them through a twin-screw extruder. After extrusion through an extrusion die head and a ribbed pipe forming machine, extrude, cool, and cut to a fixed length to obtain a self-cleaning antibacterial pipe with a reinforcing rib structure.

[0038] The preparation method of the self-cleaning antibacterial filler includes the following steps: Disperse 25 g of sepiolite in 158 g of 0.3 mol / L zinc chloride aqueous solution, and adjust the pH value to 9 with 1 mol / L sodium hydroxide aqueous solution. Then, carry out hydrothermal reaction in a high-pressure reactor. The hydrothermal reaction temperature is 180 °C, and the reaction time is 12 h. After the reaction is completed, cool it, centrifuge it, collect the solid, wash, dry, and grind it to obtain the self-cleaning antibacterial filler.

[0039] The difference between Comparative Example 3 and Example 1 is that the self-cleaning antibacterial filler is not grafted.

[0040] Performance test Use a surface contact angle tester to measure the contact angle of water on the self-cleaning antibacterial pipes with a reinforcing rib structure prepared in Examples 1-3 and Comparative Examples 1-3 to characterize the hydrophilicity and hydrophobicity of the pipes; the test results are shown in Table 1: Table 1 Contact angle test results of water on the pipes

[0041] Antibacterial test: 1 ml of Escherichia coli bacterial solution with a concentration of 10 -5 CFU / ml was separately dropped onto the surface of the self-cleaning antibacterial pipe samples with a ribbed structure prepared in Examples 1-3 after sterilization treatment. It was cultured at 37 °C for 8 h. 20 μL of the cultured bacterial solution was taken and evenly coated on a solid medium. After culturing at 37 °C for 24 h, the number of colonies on the medium was counted. At the same time, a blank experiment was conducted, and the antibacterial rate was calculated using the following formula (Ⅰ): Antibacterial rate = (A - B) / A × 100%, Formula (Ⅰ) Among them, A is the number of colonies in the blank experiment, in pieces; B is the number of colonies in the sample group experiment, in pieces; The test results are shown in Table 2: Table 2 Antibacterial rate test results

[0042] The impact performance was tested with reference to GB / T1843-2008 "Determination of Plastic Izod Impact Strength". The test results are shown in Table 3: Table 3 Impact resistance test results of the pipe

[0043] It can be seen from the experimental data in Table 1, Table 2 and Table 3 that the self-cleaning antibacterial pipe with a ribbed structure prepared by the present invention has good hydrophobic, antibacterial and mechanical properties.

[0044] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the patent protection scope of the present invention.

Claims

1. A self-cleaning and antibacterial pipe with a reinforcing rib structure, characterized in that, It comprises the following components in parts by weight: 80 - 120 parts of polyvinyl chloride resin, 3 - 5 parts of heat stabilizer, 30 - 50 parts of self - cleaning antibacterial filler, 40 - 50 parts of plasticizer, 2 - 3 parts of processing aid, and 0.5 - 1 part of antioxidant.

2. The self-cleaning and antibacterial pipe according to claim 1, wherein: The heat stabilizer is one of calcium - zinc composite stabilizer, metal soap - type heat stabilizer, and organotin heat stabilizer.

3. The self-cleaning and antibacterial pipe according to claim 1, wherein The preparation method of the self - cleaning antibacterial filler comprises the following steps: S1. Disperse sepiolite in an aqueous zinc salt solution, then adjust the pH value with an alkali, mix evenly and carry out hydrothermal reaction. After the reaction ends, collect the solid, wash, dry, and grind it to obtain a composite powder; S2. Add the composite powder into an ethanol - aqueous solution, ultrasonically disperse it, add KH550, heat and react, filter, collect the solid, wash and dry it to obtain a surface - modified composite powder; S3. Add the surface - modified composite powder into dimethyl sulfoxide, add 4 - vinylphenylacetic acid, tridecafluoroheptanoic acid, N - hydroxysuccinimide, and 1 - ethyl - (3 - dimethylaminopropyl) carbodiimide, adjust the pH value to weakly acidic, stir and react. Wash and dry the solid product, then add it into N, N - dimethylformamide, add α - phellandrene and ammonium persulfate. After the reaction is completed, filter, collect the solid product, wash and dry it to obtain the self - cleaning antibacterial filler.

4. The self-cleaning and antibacterial pipe according to claim 3, wherein: In step S1, the zinc salt is at least one of zinc chloride, zinc nitrate, and zinc acetate.

5. The self-cleaning and antibacterial pipe according to claim 3, wherein: The concentration of the aqueous zinc salt solution is 0.2 - 0.5 mol / L; the mass ratio of sepiolite to the aqueous zinc salt solution is 2 - 3:10 - 20.

6. The self-cleaning and antibacterial pipe according to claim 3, characterized in that: In step S2, the mass ratio of the composite powder to KH550 is 15 - 25:3 - 5; the heating reaction temperature is 40 - 60 °C, and the heating time is 4 - 6 h.

7. The self-cleaning antibacterial pipe according to claim 3, wherein It comprises the following steps: In step S3, the mass ratio of the surface - modified composite powder, 4 - vinylphenylacetic acid, tridecafluoroheptanoic acid, N - hydroxysuccinimide, 1 - ethyl - (3 - dimethylaminopropyl) carbodiimide, α - phellandrene, and ammonium persulfate is 10 - 20:4 - 6:4 - 6:2 - 4:2 - 4:3 - 5:0.5 - 1.

5.

8. The self-cleaning and antibacterial pipe according to claim 1, wherein The plasticizer is at least one of glycerol ester, epoxidized soybean oil, diisobutyl phthalate, dihexyl adipate, dioctyl phthalate, and diphenyl phthalate.

9. The self-cleaning and antibacterial pipe according to claim 1, wherein, The antioxidant is at least one of distearyl thiodipropionate, pentaerythritol [β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate], tris(2,4 - di - tert - butylphenyl) phosphite, butylated hydroxyanisole, and butylated hydroxytoluene.

10. A method for preparing the self-cleaning and antibacterial pipe according to any one of claims 1-9, characterized in that, It comprises the following steps: Mix the polyvinyl chloride resin, heat stabilizer, self - cleaning antibacterial filler, plasticizer, processing aid, and antioxidant evenly, then place them in an extruder for extrusion granulation. Then further process through a twin - screw extruder, and extrude, cool, and cut to a fixed length through an extrusion die head and a ribbed pipe forming machine to obtain a self - cleaning antibacterial pipe with a reinforcing rib structure.

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