PPR antibacterial pipe based on graphene oxide / nano-silver composite material

Abstract

The invention discloses a PPR antibacterial pipe based on a graphene oxide / nano-silver composite material, and relates to the technical field of antibacterial plastics, the PPR antibacterial pipe is prepared from the following raw materials by weight: 80-100 parts of PPR resin, 1-10 parts of a toughening agent, 0.5-5 parts of a graphene oxide / nano-silver composite material, 0.5-5 parts of a plasticizer, 0.5-5 parts of a compatilizer, 0.5-5 parts of a coupling agent, 0.1-1 part of a light stabilizer, and 0.1-1 part of an antioxidant; the comprehensive performance of the PPR antibacterial pipe is improved by adding the graphene oxide / nano-silver composite material, so that the PPR antibacterial pipe has a wide application range.

Description

Technical Field

[0001] The invention relates to the technical field of antibacterial plastics, and in particular to a PPR antibacterial pipe based on a graphene oxide / nanosilver composite material. Background Art

[0002] PPR antibacterial pipe refers to a PPR pipe that can keep the growth and reproduction of certain microorganisms (bacteria) in the pipe below the necessary safety level for a certain period of time. PPR pipe, also known as tripropylene pipe and random copolymer polypropylene pipe, is a pipe made of random copolymer polypropylene. Compared with traditional cast iron pipes, galvanized steel pipes, and cement pipes, PPR pipes have the advantages of energy saving and material saving, environmental protection, light weight and high strength, corrosion resistance, smooth inner wall without scaling, simple construction and maintenance, and long service life, and are widely used in many fields.

[0003] Most of the existing PPR antibacterial pipes use silver ions for antibacterial effects. When the PPR antibacterial pipe is damp, the antibacterial layer on the inner wall of the pipe will slowly release a small amount of silver ions. On the one hand, since the surface of bacteria is negatively charged, the positively charged silver ions will be adsorbed on the surface of bacteria, thereby destroying the electrolyte balance and causing the bacteria to die due to cell damage; on the other hand, since the silver ions enter the bacteria, they react with the bacterial cell enzymes, inhibiting the activity of the bacteria and the reproduction and regeneration of the bacteria, thereby achieving a sterilization effect.

[0004] Graphene is a material with a hexagonal honeycomb lattice structure composed of a single layer of carbon atoms in sp2 hybrid orbitals. It has many unique properties, such as mechanical, electrical, thermal and optical properties. In addition, graphene also has antibacterial properties. Graphene oxide is an oxide of graphene. By introducing polar groups such as carboxyl, epoxy and hydroxyl groups, graphene oxide has different physical and chemical properties from graphene. The presence of these polar groups not only enables graphene oxide to be stably dispersed in water or organic solvents, but also gives it unique chemical and physical properties, such as a large specific surface area and good water solubility. At the same time, graphene oxide exhibits better antibacterial properties.

[0005] Graphene oxide / nanosilver composite materials combine the excellent properties of graphene oxide and nanosilver, and play a synergistic role between the two to improve the antibacterial, electrical conductivity, thermal conductivity and strength of the material. Since graphene oxide / nanosilver composite materials are inorganic materials, there is a problem of poor blending compatibility when adding them to the resin matrix as antibacterial agents, making it difficult to achieve uniform dispersion in the resin matrix, which in turn affects the performance of their antibacterial properties. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a PPR antibacterial pipe based on graphene oxide / nanosilver composite material, and the comprehensive performance of the PPR antibacterial pipe is improved by adding the graphene oxide / nanosilver composite material, including antibacterial performance, mechanical performance, electrical performance and thermal performance, so that the PPR antibacterial pipe has a wide range of applications.

[0007] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0008] The first object of the present invention is to provide a PPR antibacterial pipe based on graphene oxide / nanosilver composite material, which is made of the following raw materials in parts by weight:

[0009] 80-100 parts of PPR resin, 1-10 parts of toughening agent, 0.5-5 parts of graphene oxide / nanosilver composite material, 0.5-5 parts of plasticizer, 0.5-5 parts of compatibilizer, 0.5-5 parts of coupling agent, 0.1-1 parts of light stabilizer and 0.1-1 parts of antioxidant.

[0010] Furthermore, the graphene oxide / nano-silver composite material is prepared by a hydrothermal method, and the preparation method thereof is as follows: adding graphene oxide, silver nitrate, glucose and polyvinyl pyrrolidone to deionized water, performing hydrothermal reaction after ultrasonic treatment, centrifuging the product after the reaction, washing, and drying to obtain the graphene oxide / nano-silver composite material. In the present invention, glucose is used as a reducing agent to reduce silver nitrate to silver element; polyvinyl pyrrolidone is used as a stabilizer to control the particle size and morphology of nano-silver.

[0011] Furthermore, the mass ratio of the graphene oxide, silver nitrate, glucose and polyvinyl pyrrolidone is (100-200):100:(55-65):(20-30).

[0012] Furthermore, the reaction temperature of the hydrothermal reaction is 120-130° C., and the reaction time is 3-8 hours.

[0013] The invention can synthesize nano-silver particles with high purity, small particle size and uniform distribution in situ in the graphene oxide structure by a hydrothermal method, thereby solving the problem of agglomeration of nano-silver particles and difficulty in uniform dispersion in the graphene oxide when preparing the graphene oxide / nano-silver composite material by a blending method.

[0014] Furthermore, the loading amount of nanosilver in the graphene oxide / nanosilver composite material is 20-40%. The graphene oxide / nanosilver composite material in the present invention not only functions as an antibacterial agent, but also can improve the mechanical properties, electrical properties, thermal properties, etc. of the PPR pipe by utilizing the excellent properties of graphene oxide and nanosilver in addition to the antibacterial properties.

[0015] Further, the toughening agent is at least one of SBS (styrene-butadiene-styrene block copolymer), SEBS (hydrogenated styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer), and SEPS (hydrogenated styrene-isoprene-styrene block copolymer). The purpose of the toughening agent in the present invention is to increase the toughness and ductility of the PPR resin so that it can withstand greater deformation without breaking.

[0016] Furthermore, the plasticizer is at least one of polyethylene wax and polypropylene wax. The function of the plasticizer in the present invention is to increase the plasticity and flexibility of the PPR resin and improve the processing performance and use performance of the PPR pipe.

[0017] Furthermore, the compatibilizer is maleic anhydride grafted polypropylene. The function of the compatibilizer in the present invention is to improve the compatibility of the PPR resin and the toughening agent, so that the toughening agent can fully exert its effect.

[0018] Furthermore, the compatibilizer is poly(zinc methacrylate) with a molecular weight of 3000 to 5000. Compared with maleic anhydride grafted polypropylene, poly(zinc methacrylate) with a molecular weight of 3000 to 5000 can exert a better effect.

[0019] Furthermore, the coupling agent is at least one of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, and a zirconate coupling agent. The coupling agent in the present invention promotes the uniform dispersion of the graphene oxide / nano-silver composite material in the PPR resin, so that the graphene oxide / nano-silver composite material can fully exert its effect.

[0020] Furthermore, the light stabilizer is at least one of a hindered amine light stabilizer, a hindered phenol light stabilizer, a benzotriazole ultraviolet absorber, and a benzophenone ultraviolet absorber. The addition of the light stabilizer can improve the light stability of the PPR pipe, delay the light aging process, and thus extend the service life of the PPR pipe.

[0021] Furthermore, the antioxidant is at least one of a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant. The addition of the antioxidant can delay the oxidation process of the PPR pipe, thereby extending the service life of the PPR pipe.

[0022] The second object of the present invention is to provide a method for preparing the PPR antibacterial tube based on graphene oxide / nanosilver composite material, comprising the following steps:

[0023] (1) mixing PPR resin, toughening agent, graphene oxide / nanosilver composite material, plasticizer, compatibilizer, coupling agent, light stabilizer and antioxidant uniformly according to a proportion to obtain a premix;

[0024] (2) adding the premix to a granulator for plasticizing and granulating to obtain granules;

[0025] (3) The pellets are fed into a twin-screw extruder for pipe extrusion molding, and after cooling and shaping, the PPR antibacterial pipe is obtained.

[0026] The beneficial effect of the present invention is that the present invention applies the graphene oxide / nanosilver composite material prepared by the hydrothermal method to the preparation of PPR antibacterial pipes, and utilizes the composite of graphene oxide and nanosilver to give full play to the synergistic effect of the two, while improving the antibacterial effect, the mechanical properties, electrical properties and thermal properties of the PPR antibacterial pipe can also be improved, so that the PPR antibacterial pipe has excellent comprehensive performance and expands the application field of the PPR antibacterial pipe. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0028] The present invention provides a PPR antibacterial tube based on graphene oxide / nanosilver composite material, which is made of the following raw materials in parts by weight:

[0029] 80-100 parts of PPR resin, 1-10 parts of toughening agent, 0.5-5 parts of graphene oxide / nanosilver composite material, 0.5-5 parts of plasticizer, 0.5-5 parts of compatibilizer, 0.1-1 parts of light stabilizer and 0.1-1 parts of antioxidant.

[0030] No coupling agent is added in the above technical solution. This is because the graphene oxide / nanosilver composite material used in the technical solution has good affinity with the PPR resin, and the graphene oxide / nanosilver composite material can be evenly dispersed in the PPR resin without adding a coupling agent.

[0031] Furthermore, the graphene oxide / nanosilver composite material is prepared by a hydrothermal method, and the preparation method thereof comprises the following steps:

[0032] (1) adding graphene oxide, silver nitrate, glucose and 2-(methyl-2-propylene-1-ylamino)ethanol to deionized water, and ultrasonically treating the water to obtain a mixed solution;

[0033] (2) subjecting the mixed solution and a water-soluble initiator to a hydrothermal reaction, and after the reaction is completed, centrifuging, washing, and drying the product to obtain a graphene oxide / nanosilver composite material.

[0034] Furthermore, the mass ratio of the graphene oxide, silver nitrate, glucose and 2-(methyl-2-propylene-1-ylamino)ethanol is (100-200):100:(55-65):(20-30).

[0035] Furthermore, the water-soluble initiator is azobisisobutylamidine hydrochloride or azobisisobutylimidazoline hydrochloride.

[0036] Furthermore, the amount of the water-soluble initiator used is 0.1-1% of the mass of 2-(methyl-2-propylene-1-ylamino)ethanol.

[0037] In step (1) of the technical scheme, 2-(methyl-2-propylene-1-ylamino)ethanol is used to replace polyvinyl pyrrolidone as a stabilizer, and 2-(methyl-2-propylene-1-ylamino)ethanol plays the role of a dispersant. During ultrasonic treatment, the dispersing effect of 2-(methyl-2-propylene-1-ylamino)ethanol is used to promote the uniform dispersion of graphene oxide in the mixed solution, and the in-situ synthesis of nanosilver in the graphene oxide layered structure is achieved through hydrothermal reaction, thereby improving the dispersion uniformity of nanosilver on the graphene oxide. In step (2), the polymer generated by the polymerization reaction of 2-(methyl-2-propylene-1-ylamino)ethanol under the action of an initiator is used as a binder, and the bonding effect of the polymer is used to enhance the adhesion of nanosilver on the graphene oxide, so that more nanosilver is loaded on the graphene oxide, the utilization rate of silver nitrate is improved, and the composite effect of graphene oxide and nanosilver is enhanced, and the stable loading of nanosilver on the graphene oxide is achieved, thereby avoiding the problem of nanosilver falling off from the graphene oxide during the centrifugation and washing process of the post-treatment, thereby affecting the composite effect.

[0038] Furthermore, the toughening agent is at least one of SBS, SEBS, SIS and SEPS.

[0039] Furthermore, the plasticizer is at least one of polyethylene wax and polypropylene wax.

[0040] Furthermore, the compatibilizer is maleic anhydride grafted polypropylene.

[0041] Furthermore, the coupling agent is at least one of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, and a zirconate coupling agent.

[0042] Furthermore, the light stabilizer is at least one of a hindered amine light stabilizer, a hindered phenol light stabilizer, a benzotriazole ultraviolet absorber, and a benzophenone ultraviolet absorber.

[0043] Furthermore, the antioxidant is at least one of a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant.

[0044] The present invention also provides a method for preparing the PPR antibacterial tube based on the graphene oxide / nanosilver composite material, comprising the following steps:

[0045] (1) mixing PPR resin, toughening agent, graphene oxide / nanosilver composite material, plasticizer, compatibilizer, light stabilizer and antioxidant uniformly according to a proportion to obtain a premix;

[0046] (2) adding the premix into a granulator for plasticizing and granulating to obtain granules;

[0047] (3) The pellets are fed into a twin-screw extruder for pipe extrusion molding, and after cooling and shaping, the PPR antibacterial pipe is obtained.

[0048] The sources of some raw materials in the following examples and comparative examples are described:

[0049] PPR resin was purchased from Yangzi Petrochemical C180;

[0050] SBS was purchased from Sinopec Baling YH-792;

[0051] SEBS was purchased from Sinopec Baling YH-503T;

[0052] Polyethylene wax was purchased from Wuhan Xindongyi Chemical Co., Ltd. Q-400;

[0053] Polypropylene wax was purchased from Shanghai Hongzhuang Chemical Technology Co., Ltd. CS-52NC;

[0054] Maleic anhydride grafted polypropylene was purchased from Foshan Gao Plastic Chemical Co., Ltd. G136;

[0055] Polyvinylpyrrolidone was purchased from Shanxi Jinyang Pharmaceutical Excipients Co., Ltd. K30;

[0056] Graphene oxide was purchased from Zhongke Leiming (Beijing) Technology Co., Ltd., with a diameter of 0.5-3 μm, a thickness of 0.55-1.2 nm, and a content of >99 wt%;

[0057] Polyvinyl alcohol was purchased from Xi'an Tianzheng Pharmaceutical Excipients Co., Ltd., with a viscosity of 20-25 mPa.S.

[0058] Example 1

[0059] 1. Preparation of graphene oxide / nanosilver composite materials:

[0060] 100 g of graphene oxide, 100 g of silver nitrate, 55 g of glucose and 20 g of polyvinyl pyrrolidone were added to 500 mL of deionized water, and a hydrothermal reaction was carried out after ultrasonic treatment (reaction temperature was 130 ° C, reaction time was 3 h). After the reaction, the product was centrifuged, washed with deionized water until neutral, and dried to obtain a graphene oxide / nanosilver composite material.

[0061] 2. Preparation of PPR antibacterial pipe:

[0062] (1) 100 parts of PPR resin, 10 parts of SBS, 3 parts of graphene oxide / nanosilver composite material, 3 parts of polypropylene wax, 3 parts of maleic anhydride grafted polypropylene, 3 parts of silane coupling agent KH570, 0.5 parts of ultraviolet absorber UV531 and 0.5 parts of antioxidant 1010 were mixed uniformly (rotation speed of 2000 r / min, time of 10 min) to obtain a premix.

[0063] (2) The premix is ​​added into a granulator for plasticizing and granulation (190-230° C.) to obtain granules.

[0064] (3) The pellets are fed into a twin-screw extruder for pipe extrusion molding (180-220° C.), and after cooling and shaping, the PPR antibacterial pipe is obtained.

[0065] Example 2

[0066] 1. Preparation of graphene oxide / nanosilver composite materials:

[0067] 150 g of graphene oxide, 100 g of silver nitrate, 60 g of glucose and 25 g of polyvinyl pyrrolidone were added to 500 mL of deionized water, and a hydrothermal reaction was carried out after ultrasonic treatment (reaction temperature was 130 ° C, reaction time was 5 h). After the reaction, the product was centrifuged, washed with deionized water until neutral, and dried to obtain a graphene oxide / nanosilver composite material.

[0068] 2. Preparation of PPR antibacterial pipe:

[0069] (1) 80 parts of PPR resin, 5 parts of SEBS, 3 parts of graphene oxide / nanosilver composite material, 4 parts of polyethylene wax, 3 parts of maleic anhydride grafted polypropylene, 3 parts of titanate coupling agent TTS, 0.5 parts of light stabilizer UV944 and 0.8 parts of antioxidant 168 were mixed uniformly (speed of 2000 r / min, time of 10 min) to obtain a premix.

[0070] (2) The premix is ​​added into a granulator for plasticizing and granulation (190-230° C.) to obtain granules.

[0071] (3) The pellets are fed into a twin-screw extruder for pipe extrusion molding (180-220° C.), and after cooling and shaping, the PPR antibacterial pipe is obtained.

[0072] Example 3

[0073] 1. Preparation of graphene oxide / nanosilver composite materials:

[0074] 200 g of graphene oxide, 100 g of silver nitrate, 65 g of glucose and 30 g of polyvinyl pyrrolidone were added to 500 mL of deionized water, and a hydrothermal reaction was carried out after ultrasonic treatment (reaction temperature was 125 ° C, reaction time was 6 h). After the reaction, the product was centrifuged, washed with deionized water until neutral, and dried to obtain a graphene oxide / nanosilver composite material.

[0075] 2. Preparation of PPR antibacterial pipe:

[0076] (1) 100 parts of PPR resin, 10 parts of SEBS, 5 parts of graphene oxide / nanosilver composite material, 4 parts of polypropylene wax, 5 parts of maleic anhydride grafted polypropylene, 5 parts of silane coupling agent KH570, 0.5 parts of light stabilizer UV944 and 0.5 parts of antioxidant 168 were mixed uniformly (rotation speed of 2000 r / min, time of 10 min) to obtain a premix.

[0077] (2) The premix is ​​added into a granulator for plasticizing and granulation (190-230° C.) to obtain granules.

[0078] (3) The pellets are fed into a twin-screw extruder for pipe extrusion molding (180-220° C.), and after cooling and shaping, the PPR antibacterial pipe is obtained.

[0079] Example 4

[0080] The preparation method of the PPR antibacterial tube in Example 4 is the same as that in Example 3, except that the maleic anhydride grafted polypropylene is replaced by polyzinc methacrylate with an average molecular weight of 3500.

[0081] Synthesis of polyzinc methacrylate: Add zinc methacrylate and dibenzoyl peroxide to ethanol, heat to 65-70°C under nitrogen protection for reaction, centrifuge after the reaction, wash with water to remove ethanol, and dry to obtain polyzinc methacrylate with an average molecular weight of 3500. The amount of dibenzoyl peroxide is 0.5% of the mass of zinc methacrylate.

[0082] Example 5

[0083] The preparation method of the PPR antibacterial tube in Example 5 is the same as that in Example 3, except that the preparation method of the graphene oxide / nanosilver composite material is changed.

[0084] Preparation of graphene oxide / nanosilver composite materials:

[0085] (1) 200 g of graphene oxide, 100 g of silver nitrate, 65 g of glucose and 30 g of 2-(methyl-2-propylene-1-ylamino)ethanol were added to 500 mL of deionized water and ultrasonically treated to obtain a mixed solution.

[0086] (2) The mixed solution and 0.15 g of azobisisobutylimidazoline hydrochloride were subjected to a hydrothermal reaction (reaction temperature: 125° C., reaction time: 6 h). After the reaction, the product was centrifuged, washed with deionized water until neutral, and dried to obtain a graphene oxide / nanosilver composite material.

[0087] Example 6

[0088] The preparation method of the PPR antibacterial tube in Example 6 is the same as that in Example 3, except that the preparation method of the graphene oxide / nanosilver composite material is changed.

[0089] Preparation of graphene oxide / nanosilver composite materials:

[0090] (1) 200 g of graphene oxide, 100 g of silver nitrate, 65 g of glucose and 30 g of 2-(methyl-2-propylene-1-ylamino)ethanol were added to 500 mL of deionized water and ultrasonically treated to obtain a mixed solution.

[0091] (2) The mixed solution and 0.2 g of azobisisobutylamidine hydrochloride were subjected to a hydrothermal reaction (reaction temperature: 125° C., reaction time: 6 h). After the reaction, the product was centrifuged, washed with deionized water until neutral, and dried to obtain a graphene oxide / nanosilver composite material.

[0092] Comparative Example 1

[0093] The preparation method of the PPR antibacterial tube in Comparative Example 1 is the same as that in Example 6, except that the 2-(methyl-2-propylene-1-ylamino)ethanol in the preparation method of the graphene oxide / nanosilver composite material is replaced by N-hydroxyethyl acrylamide.

[0094] Preparation of graphene oxide / nanosilver composite materials:

[0095] (1) 200 g of graphene oxide, 100 g of silver nitrate, 65 g of glucose and 30 g of N-hydroxyethyl acrylamide were added to 500 mL of deionized water and ultrasonically treated to obtain a mixed solution.

[0096] (2) The mixed solution and 0.2 g of azobisisobutylamidine hydrochloride were subjected to a hydrothermal reaction (reaction temperature: 125° C., reaction time: 6 h). After the reaction, the product was centrifuged, washed with deionized water until neutral, and dried to obtain a graphene oxide / nanosilver composite material.

[0097] Comparative Example 2

[0098] The preparation method of the PPR antibacterial tube in Comparative Example 2 is the same as that in Example 6, except that the 2-(methyl-2-propylene-1-ylamino)ethanol in the preparation method of the graphene oxide / nanosilver composite material is replaced by polyvinyl alcohol.

[0099] Preparation of graphene oxide / nanosilver composite materials:

[0100] (1) 200 g of graphene oxide, 100 g of silver nitrate, 65 g of glucose and 30 g of polyvinyl alcohol were added to 500 mL of deionized water and ultrasonically treated to obtain a mixed solution.

[0101] (2) subjecting the mixed solution to a hydrothermal reaction (reaction temperature of 125° C., reaction time of 6 h), and after the reaction, centrifuging the product, washing with deionized water until neutral, and drying to obtain a graphene oxide / nanosilver composite material.

[0102] The antibacterial properties and mechanical properties of the graphene oxide / nanosilver composite materials and PPR antibacterial tubes prepared in Examples 1 to 6 and Comparative Examples 1 to 2 were tested, respectively. The results are shown in Table 1.

[0103] The antimicrobial properties were tested against the minimum inhibitory concentration of Escherichia coli using the microdilution method;

[0104] The mechanical property test is tensile strength, according to GB / T 8804.2-2003.

[0105] Table 1

[0106]

[0107]

[0108] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A PPR antibacterial pipe based on graphene oxide / nanosilver composite material, characterized in that: Made from the following raw materials in parts by weight: 80-100 parts of PPR resin, 1-10 parts of toughening agent, 0.5-5 parts of graphene oxide / nanosilver composite material, 0.5-5 parts of plasticizer, 0.5-5 parts of compatibilizer, 0.5-5 parts of coupling agent, 0.1-1 parts of light stabilizer and 0.1-1 parts of antioxidant.

2. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 1, characterized in that: The toughening agent is at least one of SBS, SEBS, SIS and SEPS.

3. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 1, characterized in that: The graphene oxide / nanosilver composite material is prepared by a hydrothermal method.

4. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 3, characterized in that: The loading amount of nano silver in the graphene oxide / nano silver composite material is 20-40%.

5. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 1, characterized in that: The plasticizer is at least one of polyethylene wax and polypropylene wax.

6. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted polypropylene.

7. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 1, characterized in that: The coupling agent is at least one of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, and a zirconate coupling agent.

8. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 1, characterized in that: The light stabilizer is at least one of a hindered amine light stabilizer, a hindered phenol light stabilizer, a benzotriazole ultraviolet absorber, and a benzophenone ultraviolet absorber.

9. The PPR antibacterial pipe based on graphene oxide / nanosilver composite material according to claim 1, characterized in that: The antioxidant is at least one of a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant.

10. The method for preparing a PPR antibacterial tube based on graphene oxide / nanosilver composite material according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) mixing PPR resin, toughening agent, graphene oxide / nanosilver composite material, plasticizer, coupling agent, light stabilizer and antioxidant uniformly according to a proportion to obtain a premix; (2) adding the premix into a granulator for plasticizing and granulating to obtain granules; (3) The pellets are fed into a twin-screw extruder for pipe extrusion molding, and after cooling and shaping, the PPR antibacterial pipe is obtained.

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