Environment-friendly antibacterial PPR pipeline and preparation method thereof

Abstract

The invention relates to an environment-friendly antibacterial PPR pipeline and a preparation method thereof, and belongs to the technical field of pipeline processing. By utilizing the large specific surface area and the unique nano structure of the graphene oxide, the allicin is tightly combined on the surface of the graphene oxide through the dual effects of physical adsorption and chemical bond connection; due to the addition of the tea tree oil, the decomposition of allicin is effectively inhibited due to excellent oxidation resistance and stability of the tea tree oil, and the antibacterial property is further enhanced through the synergistic effect of contained bioactive components such as terpene substances and allicin; the introduction of citric acid promotes the tight combination among the tea tree oil, the allicin and the graphene oxide, provides a weak acid environment, and is helpful for stabilizing the structure of the allicin, so that the activity of the environment-friendly antibacterial agent is maintained and improved. The PPR pipeline prepared by adding the environment-friendly antibacterial agent does not cause pollution risk to the environment in the whole preparation process and subsequent application, and conforms to the concept of green development.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline processing and relates to an environmentally friendly and antibacterial PPR pipeline and a preparation method thereof. Background Art

[0002] With the rapid development of modern buildings and water supply systems, the requirements for pipe materials are getting higher and higher. Traditional pipe materials are prone to breeding bacteria, mold and other microorganisms during long-term use, which not only affects water quality, but also poses a potential threat to human health. Therefore, it is particularly important to develop a pipe material that is both environmentally friendly and antibacterial.

[0003] PPR pipes are widely used in building water supply systems due to their excellent physical properties, chemical stability and processing performance. However, ordinary PPR pipes do not have antibacterial functions and can easily become a breeding ground for bacteria after long-term use. In order to solve this problem, a variety of antibacterial pipe materials have appeared on the market, but these materials often have problems such as short-lasting antibacterial effects, poor processing performance or high costs. Therefore, it is very necessary to develop a PPR pipe that is both environmentally friendly and has long-lasting antibacterial functions. Summary of the invention

[0004] The object of the present invention is to provide an environmentally friendly and antibacterial PPR pipe and a preparation method thereof, which has the characteristics of environmentally friendly preparation process and high antibacterial performance.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An environmentally friendly antibacterial PPR pipe comprises an outer layer and an antibacterial inner layer. The outer layer has the following formula: by weight: 100-110 parts of PPR, 3-5 parts of filler, 2-3 parts of POE, 1-2 parts of color powder, 0.5-0.8 parts of compatibilizer,

[0007] The formula of the antibacterial inner layer is as follows: by weight: 110-130 parts of PPR, 3-5 parts of POE, 2-3 parts of filler, 1-2 parts of environmentally friendly antibacterial agent, 0.5-1 part of antioxidant, and 0.3-0.5 part of compatibilizer.

[0008] Wherein, the preparation method of the environmentally friendly antibacterial agent is as follows:

[0009] S1-1: adding 5 to 10 parts by weight of allicin to 25 to 30 parts by weight of ethanol solution, and ultrasonicating at room temperature for 20 minutes to obtain solution A;

[0010] S1-2: 12 to 15 parts by weight of graphene oxide were added to solution A, and the solution was ultrasonicated at 40°C for 2 hours, and then centrifuged at 4000 to 5000 r / min for 10 minutes, and then dried in a vacuum drying oven at 60°C for 12 hours, and then ball-milled in a ball mill for 1 hour to obtain powder B;

[0011] S1-3: Add 3 to 5 parts by weight of tea tree oil to 10 to 20 parts by weight of 75% ethanol solution to obtain solution C, then add powder B to solution C, ultrasonically stir for 1.5 hours at room temperature, then add 0.5 to 1 part by weight of citric acid solution, continue stirring for 30 minutes, and obtain the environmentally friendly antibacterial agent after rotary evaporation.

[0012] Furthermore, the antioxidant is one or a combination of antioxidant 1010 or antioxidant 168.

[0013] Furthermore, the mass fraction of ethanol in the ethanol solution in S1-1 is 90%.

[0014] Furthermore, the ball milling speed in S1-2 is 300 r / min.

[0015] Furthermore, the concentration of the citric acid solution in S1-3 is 0.5M.

[0016] Furthermore, the filler is talcum powder.

[0017] Furthermore, the compatibilizer is silane coupling agent KH560.

[0018] A method for preparing an environmentally friendly and antibacterial PPR pipe, the specific steps of the preparation method are as follows:

[0019] S8-1: According to the formula, PPR and POE were stirred and mixed for 30 minutes, and then environmentally friendly antibacterial agent, filler, antioxidant and compatibilizer were added and stirred and mixed for 30 minutes, and melt-extruded and granulated by an extruder to obtain an antibacterial inner layer masterbatch;

[0020] S8-2: PPR and POE were stirred and mixed for 30 minutes according to the formula, and fillers, color powder and compatibilizer were added and stirred and mixed for 1 hour, and melt-extruded and granulated by an extruder to obtain an outer layer masterbatch;

[0021] S8-3: Add the antibacterial inner layer masterbatch and the outer layer masterbatch into a co-extrusion mold for composite co-extrusion, keep warm at 100° C. for 1 to 2 hours, and then naturally cool to room temperature to obtain the environmentally friendly antibacterial PPR pipe.

[0022] Furthermore, it is characterized in that the temperature of the extruder in S8-1 is 180-190°C.

[0023] Furthermore, it is characterized in that the processing temperature of the composite co-extrusion in S8-3 is 170-190°C.

[0024] The environmentally friendly antibacterial agent uses graphene oxide as a carrier and uses allicin to modify graphene oxide. Due to its large specific surface area and unique nanostructure, graphene oxide can form a relatively stable connection with allicin through physical adsorption; at the same time, the sulfur atoms in allicin may combine with the oxygen-containing groups on the surface of graphene oxide, further realizing the close combination between allicin and graphene oxide. Tea tree oil has excellent antioxidant properties and stability, and can effectively inhibit the decomposition of allicin. The introduction of citric acid can further promote the combination between tea tree oil, allicin and graphene oxide; in addition, it can provide a weak acid environment, which helps to stabilize the structure of allicin, so that its antibacterial activity can be maintained and improved.

[0025] The nanostructure and sharp edges of graphene oxide can physically cut the cell walls and cell membranes of bacteria, causing damage to the cell structure and triggering the leakage of cell contents. At the same time, the bioactive ingredients contained in allicin and tea tree oil, such as sulfur compounds in allicin and terpenes in tea tree oil, can effectively intervene in the metabolic cycle of bacteria, block the protein synthesis pathway and DNA replication process, and thus curb the growth and proliferation of bacteria. Graphene oxide has a large specific surface area and abundant surface defects, providing more contact interfaces and active sites, promoting the direct interaction between allicin and tea tree oil molecules and bacteria, thereby enhancing the inhibitory effect of these two natural antibacterial agents on bacteria. In addition, the intervention of graphene oxide not only increases the probability of tea tree oil and allicin contacting bacteria, but also may guide antibacterial molecules to more effectively penetrate the outer layer of bacteria through the charge effect on its surface. The active ingredients in allicin and tea tree oil can specifically interact with the lipid bilayer on the bacterial cell membrane, triggering lipid peroxidation and producing oxidative stress. This process destroys the integrity of the cell membrane and attacks key biological macromolecules inside the bacteria, such as proteins and nucleic acids. The excellent conductive properties of graphene oxide promote the rapid transfer of electrons and accelerate the process of oxidation reactions, making the oxidative stress state of bacteria more severe and the damage to the cell membrane and internal structure more serious, thereby achieving a synergistic inhibitory effect on bacteria.

[0026] As an elastomer, POE can significantly improve the low-temperature toughness of PPR materials. In cold climates, PPR pipes containing POE can better resist the impact of external forces and reduce the risk of breakage. PPR and POE have good compatibility, which helps to form a uniform blend. The ethylene segments in PPR and POE can form a eutectic structure, thereby enhancing the interaction between the two and helping to improve the tensile and impact properties of the PPR and POE blend. In addition, the addition of POE may help to improve the melt fluidity of PPR, making it easier to plasticize and mold during processing, helping to improve production efficiency and reduce production costs.

[0027] Talc can be dispersed in the PPR matrix to form an intercalated structure. When the composite material is subjected to tension, bending or impact, talc has a good toughening and strengthening effect on the PPR pipe due to its layered structure and its own high modulus. In addition, talc has good lubricity and low friction coefficient, which can reduce the friction loss of PPR pipes during processing and improve production efficiency. At the same time, it also helps to reduce the heat and wear generated by friction during the use of the pipe and extend its service life. The addition of silane coupling agent can not only significantly improve the compatibility between talc, environmentally friendly antibacterial agents and PPR matrix, but also effectively reduce interface defects and improve the overall mechanical properties of the composite material.

[0028] Beneficial effects of the present invention:

[0029] (1) The preparation of the environmentally friendly antibacterial agent uses graphene oxide as a carrier. Through the dual mechanism of physical adsorption and chemical bonding, allicin is tightly loaded on the surface of graphene oxide. On this basis, the introduction of tea tree oil and citric acid not only effectively stabilizes the structure of allicin, but also further enhances the antibacterial properties. All ingredients in this preparation process and subsequent application links show environmentally friendly characteristics, ensuring no pollution risk throughout the entire life cycle from production to use, which is in line with the concept of green development.

[0030] (2) The pipe is made of PPR as the base material, and POE, environmentally friendly antibacterial agents, fillers and compatibilizers are added in a scientific ratio. The entire preparation process avoids the introduction of harmful substances. In addition, the allicin and tea tree oil in the environmentally friendly antibacterial agent, as well as talcum powder as filler, are all derived from the natural environment and have excellent biocompatibility, ensuring that the product will not have a negative impact on the environment during use. The final PPR pipe has good antibacterial properties. DETAILED DESCRIPTION

[0031] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0032] In the following examples and comparative examples:

[0033] PPR: purchased from Chengdu Dianchun Technology Co., Ltd.;

[0034] POE: purchased from Wuhan Shuer Biotechnology Co., Ltd.;

[0035] Color powder: purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd.

[0036] Graphene oxide: purchased from Anhui Kerun Nanotechnology Co., Ltd.;

[0037] Allicin: purchased from Shanghai Yihe Biotechnology Co., Ltd.;

[0038] Tea tree oil: purchased from Jiangxi Baicao Pharmaceutical Co., Ltd.;

[0039] Citric acid: purchased from Hunan Dongting Citric Acid Chemical Co., Ltd., CAS No. 77-92-9;

[0040] Ethanol: purchased from Xi'an Sanpu Chemical Reagent Co., Ltd., CAS No. 64-17-5;

[0041] Antioxidant 1010: purchased from Guangzhou Dayin New Materials Co., Ltd.

[0042] Antioxidant 168: purchased from Changzhou Qingmu Biotechnology Co., Ltd.;

[0043] Talc: purchased from Guangxi Longsheng Huamei Talc Development Co., Ltd., CAS No. 14807-96-6;

[0044] Silane coupling agent KH560: purchased from Huangshan Kebery New Material Technology Co., Ltd.

[0045] Example 1

[0046] An environmentally friendly antibacterial PPR pipe comprises an outer layer and an antibacterial inner layer. The formula 1 of the outer layer is as follows: by weight: 105 parts of PPR, 4 parts of talc, 2.5 parts of POE, 1.5 parts of color powder, 0.7 parts of silane coupling agent KH560,

[0047] The formula 1 of the antibacterial inner layer is as follows: by weight: 120 parts of PPR, 4 parts of POE, 2.5 parts of talcum powder, 1.5 parts of environmentally friendly antibacterial agent, 0.5 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.4 parts of silane coupling agent KH560,

[0048] Wherein, the preparation method of the environmentally friendly antibacterial agent is as follows:

[0049] S1-1: adding 7 parts by weight of allicin to 27 parts by weight of 90% ethanol solution, and ultrasonicating at room temperature for 20 minutes to obtain solution A;

[0050] S1-2: 14 parts by weight of graphene oxide was added to solution A, and the solution was ultrasonicated at 40°C for 2 hours, and then centrifuged at 4500 r / min for 10 minutes, and then dried in a vacuum drying oven at 60°C for 12 hours, and then ball-milled in a ball mill for 1 hour at a ball milling speed of 300 r / min to obtain powder B;

[0051] S1-3: Add 4 parts by weight of tea tree oil to 15 parts by weight of 75% ethanol solution to obtain solution C, then add powder B to solution C, ultrasonically stir for 1.5 hours at room temperature, then add 0.8 parts by weight of 0.5M citric acid solution, continue stirring for 30 minutes, and obtain the environmentally friendly antibacterial agent after rotary evaporation.

[0052] A method for preparing an environmentally friendly and antibacterial PPR pipe, the specific steps of the preparation method are as follows:

[0053] S8-1: According to the formula 1 of the antibacterial inner layer, PPR and POE were first stirred and mixed for 30 minutes, and then environmentally friendly antibacterial agent, talcum powder, antioxidant 1010, antioxidant 168 and silane coupling agent KH560 were added and stirred and mixed for 30 minutes, and melt-extruded and granulated by an extruder at a temperature of 185°C to obtain an antibacterial inner layer masterbatch;

[0054] S8-2: PPR and POE were stirred and mixed for 30 minutes according to the outer layer formula 1, and talcum powder, color powder and silane coupling agent KH560 were added and stirred for 1 hour. The temperature was 175°C, and the mixture was melt-extruded and granulated by an extruder to obtain an outer layer masterbatch;

[0055] S8-3: Add the antibacterial inner layer masterbatch and the outer layer masterbatch into a co-extrusion mold for composite co-extrusion at a processing temperature of 180° C., keep warm at 100° C. for 1.5 hours, and then naturally cool to room temperature to obtain the environmentally friendly antibacterial PPR pipe.

[0056] Example 2

[0057] An environmentally friendly antibacterial PPR pipe comprises an outer layer and an antibacterial inner layer. The formula 2 of the outer layer is as follows: by weight: 100 parts of PPR, 3 parts of talcum powder, 2 parts of POE, 1 part of color powder, 0.5 parts of silane coupling agent KH560,

[0058] The formula 2 of the antibacterial inner layer is as follows: by weight: 110 parts of PPR, 3 parts of POE, 2 parts of talcum powder, 1 part of environmentally friendly antibacterial agent, 0.5 parts of antioxidant 1010, and 0.3 parts of silane coupling agent KH560.

[0059] Wherein, the preparation method of the environmentally friendly antibacterial agent is as follows:

[0060] S1-1: adding 5 parts by weight of allicin to 25 parts by weight of 90% ethanol solution, and ultrasonicating at room temperature for 20 minutes to obtain solution A;

[0061] S1-2: 12 parts by weight of graphene oxide were added to solution A, ultrasonicated at 40°C for 2 hours, centrifuged at 4000 r / min for 10 minutes, dried in a vacuum oven at 60°C for 12 hours, and then ball-milled in a ball mill for 1 hour at a ball milling speed of 300 r / min to obtain powder B;

[0062] S1-3: Add 3 parts by weight of tea tree oil to 10 parts by weight of 75% ethanol solution to obtain solution C, then add powder B to solution C, ultrasonically stir for 1.5 hours at room temperature, then add 0.5 parts by weight of 0.5M citric acid solution, continue stirring for 30 minutes, and obtain the environmentally friendly antibacterial agent after rotary evaporation.

[0063] A method for preparing an environmentally friendly and antibacterial PPR pipe, the specific steps of the preparation method are as follows:

[0064] S8-1: According to the formula 2 of the antibacterial inner layer, PPR and POE were first stirred and mixed for 30 minutes, and then environmentally friendly antibacterial agent, talcum powder, antioxidant 1010 and silane coupling agent KH560 were added and stirred and mixed for 30 minutes, and melt-extruded and granulated by an extruder at a temperature of 180°C to obtain an antibacterial inner layer masterbatch;

[0065] S8-2: PPR and POE were stirred and mixed for 30 minutes according to the outer layer formula 2, and talcum powder, color powder and silane coupling agent KH560 were added and stirred for 1 hour. The temperature was 175°C, and the mixture was melt-extruded and granulated by an extruder to obtain an outer layer masterbatch;

[0066] S8-3: Add the antibacterial inner layer masterbatch and the outer layer masterbatch into a co-extrusion mold for composite co-extrusion at a processing temperature of 170° C., keep warm at 100° C. for 1 hour, and then naturally cool to room temperature to obtain the environmentally friendly antibacterial PPR pipe.

[0067] Example 3

[0068] An environmentally friendly antibacterial PPR pipe comprises an outer layer and an antibacterial inner layer. The formula 3 of the outer layer is as follows: by weight: 110 parts of PPR, 5 parts of talc, 3 parts of POE, 2 parts of color powder, 0.8 parts of silane coupling agent KH560,

[0069] The formula 3 of the antibacterial inner layer is as follows: by weight: 130 parts of PPR, 5 parts of POE, 3 parts of talcum powder, 2 parts of environmentally friendly antibacterial agent, 1681 parts of antioxidant, 0.5 parts of silane coupling agent KH560,

[0070] Wherein, the preparation method of the environmentally friendly antibacterial agent is as follows:

[0071] S1-1: adding 10 parts by weight of allicin to 30 parts by weight of 90% ethanol solution, and ultrasonicating at room temperature for 20 minutes to obtain solution A;

[0072] S1-2: 15 parts by weight of graphene oxide was added to solution A, and the solution was ultrasonicated at 40°C for 2 hours, and then centrifuged at 5000 r / min for 10 minutes, and then dried in a vacuum drying oven at 60°C for 12 hours, and then ball-milled in a ball mill for 1 hour at a ball milling speed of 300 r / min to obtain powder B;

[0073] S1-3: Add 5 parts by weight of tea tree oil to 20 parts by weight of 75% ethanol solution to obtain solution C, then add powder B to solution C, ultrasonically stir for 1.5 hours at room temperature, then add 1 part by weight of 0.5M citric acid solution, continue stirring for 30 minutes, and obtain the environmentally friendly antibacterial agent after rotary evaporation.

[0074] A method for preparing an environmentally friendly and antibacterial PPR pipe, the specific steps of the preparation method are as follows:

[0075] S8-1: According to the formula 3 of the antibacterial inner layer, PPR and POE were first stirred and mixed for 30 minutes, and then environmentally friendly antibacterial agent, talcum powder, antioxidant 168 and silane coupling agent KH560 were added and stirred and mixed for 30 minutes, and melt-extruded and granulated by an extruder at a temperature of 190°C to obtain an antibacterial inner layer masterbatch;

[0076] S8-2: PPR and POE were stirred and mixed for 30 minutes according to the outer layer formula 3, and talcum powder, color powder and silane coupling agent KH560 were added and stirred for 1 hour. The temperature was 175°C, and the mixture was melt-extruded and granulated by an extruder to obtain an outer layer masterbatch;

[0077] S8-3: Add the antibacterial inner layer masterbatch and the outer layer masterbatch into a co-extrusion mold for composite co-extrusion at a processing temperature of 190° C., keep warm at 100° C. for 2 hours, and then naturally cool to room temperature to obtain the environmentally friendly antibacterial PPR pipe.

[0078] Comparative Example 1

[0079] In the preparation of the environmentally friendly antibacterial agent, allicin is not added, and the remaining steps are consistent with those in Example 1.

[0080] Comparative Example 2

[0081] Tea tree oil was not added in the preparation of the environmentally friendly antibacterial agent, and the remaining steps were consistent with those in Example 1.

[0082] Comparative Example 3

[0083] No citric acid solution was added during the preparation of the environmentally friendly antibacterial agent, and the remaining steps were consistent with those in Example 1.

[0084] Comparative Example 4

[0085] Unmodified graphene was used as the environmentally friendly antibacterial agent, and the remaining steps were consistent with those in Example 1.

[0086] Antibacterial performance test

[0087] The antibacterial PPR pipes prepared in the embodiment and the comparative example were tested for antibacterial performance according to the QB / T2591-2003 test method and standard. Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus were selected as indicator bacteria, respectively. The initial concentration of the bacterial solution was about 1×10 6 cfu / mL.

[0088] The experimental data are summarized in the following table:

[0089]

[0090]

[0091] It can be seen from the experimental data of the embodiments and comparative examples that the PPR pipe prepared by synergistically modifying graphene with allicin and tea tree oil and using citric acid as a stabilizing promoter has excellent antibacterial properties against Escherichia coli and Staphylococcus aureus.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An environmentally friendly and antibacterial PPR pipe, characterized in that: It comprises an outer layer and an antibacterial inner layer. The outer layer has the following formula: 100-110 parts of random copolymer polypropylene PPR, 3-5 parts of filler, 2-3 parts of polyolefin elastomer POE, 1-2 parts of color powder, 0.5-0.8 parts of compatibilizer, The formula of the antibacterial inner layer is as follows: by weight: 110-130 parts of PPR, 3-5 parts of POE, 2-3 parts of filler, 1-2 parts of environmentally friendly antibacterial agent, 0.5-1 part of antioxidant, and 0.3-0.5 part of compatibilizer. Wherein, the preparation method of the environmentally friendly antibacterial agent is as follows: S1-1: adding 5 to 10 parts by weight of allicin to 25 to 30 parts by weight of ethanol solution, and ultrasonicating at room temperature for 20 minutes to obtain solution A; S1-2: 12 to 15 parts by weight of graphene oxide were added to solution A, and the solution was ultrasonicated at 40°C for 2 hours, and then centrifuged at 4000 to 5000 r / min for 10 minutes, and then dried in a vacuum drying oven at 60°C for 12 hours, and then ball-milled in a ball mill for 1 hour to obtain powder B; S1-3: Add 3 to 5 parts by weight of tea tree oil to 10 to 20 parts by weight of 75% ethanol solution to obtain solution C, then add powder B to solution C, ultrasonically stir for 1.5 hours at room temperature, then add 0.5 to 1 part by weight of citric acid solution, continue stirring for 30 minutes, and obtain the environmentally friendly antibacterial agent after rotary evaporation.

2. The environmentally friendly and antibacterial PPR pipe according to claim 1 is characterized in that: The antioxidant is one or a combination of antioxidant 1010 and antioxidant 168.

3. The environmentally friendly and antibacterial PPR pipe according to claim 1 is characterized in that: The mass fraction of ethanol in the ethanol solution in S1-1 is 90%.

4. The environmentally friendly and antibacterial PPR pipe according to claim 1 is characterized in that: The ball milling speed in S1-2 is 300 r / min.

5. The environmentally friendly and antibacterial PPR pipe according to claim 1 is characterized in that: The concentration of the citric acid solution in S1-3 is 0.5M.

6. The environmentally friendly and antibacterial PPR pipe according to claim 1 is characterized in that: The filler is talc.

7. The environmentally friendly and antibacterial PPR pipe according to claim 1 is characterized in that: The compatibilizer is silane coupling agent KH560.

8. A method for preparing an environmentally friendly and antibacterial PPR pipe as claimed in claims 1 to 7, characterized in that: The specific steps of the preparation method are as follows: S8-1: According to the formula, PPR and POE were stirred and mixed for 30 minutes, and then environmentally friendly antibacterial agent, filler, antioxidant and compatibilizer were added and stirred and mixed for 30 minutes, and melt-extruded and granulated by an extruder to obtain an antibacterial inner layer masterbatch; S8-2: PPR and POE were stirred and mixed for 30 minutes according to the formula, and fillers, color powder and compatibilizer were added and stirred and mixed for 1 hour, and melt-extruded and granulated by an extruder to obtain an outer layer masterbatch; S8-3: Add the antibacterial inner layer masterbatch and the outer layer masterbatch into a co-extrusion mold for composite co-extrusion, keep warm at 100° C. for 1 to 2 hours, and then naturally cool to room temperature to obtain the environmentally friendly antibacterial PPR pipe.

9. The method for preparing an environmentally friendly and antibacterial PPR pipe according to claim 8, characterized in that: The temperature of the extruder in S8-1 is 180-190°C.

10. The method for preparing an environmentally friendly and antibacterial PPR pipe according to claim 8, characterized in that: The processing temperature of the composite co-extrusion in S8-3 is 170-190°C.

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