Method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by recycling all components of medical infusion bag

Abstract

The present application belongs to the technical field of medical waste resource recycling, and particularly relates to a method for preparing a flame-retardant and antibacterial high-performance wood-plastic masterbatch from full components of medical infusion bags, which comprises four steps of medical infusion bag recycling and grading pretreatment, paper pulp modification treatment and spray drying, plastic substrate low-temperature crushing and blending granulation in sequence, adopts a combined process of water washing, water flotation and centrifugal separation to realize high-efficiency separation of plastic substrates and paper labels, uses paper pulp fibers to adsorb zinc ions, generates in-situ nano zinc oxide through high-pressure spray drying after adjusting the pH value by ammonia water, and prepares antibacterial paper fiber powder; and then plastic chips, the antibacterial paper fiber powder and a compatibilizer containing a maleic anhydride group are blended, extruded and granulated. Through the complexation of the compatibilizer and zinc oxide, the dispersibility of the antibacterial paper fiber powder and the interfacial bonding force with the plastic substrate are improved, the prepared wood-plastic masterbatch has excellent mechanical and antibacterial properties, and full-component recycling of medical infusion bags is realized.

Description

Technical Field

[0001] This invention belongs to the field of medical waste resource recycling technology, and in particular relates to a method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by fully recycling the components of medical infusion bags. Background Technology

[0002] Medical infusion bags are among the most widely used disposable medical supplies in clinical practice, resulting in a massive annual waste volume. These products are mostly copolymer polypropylene plastic materials with paper labels, representing typical paper-plastic composite waste. Currently, existing recycling technologies struggle to completely separate the paper and plastic components, leaving trace amounts of plastic debris in the recycled label pulp. This severely restricts the resource recovery and high-value utilization of paper labels. This situation not only wastes resources and increases production costs for enterprises but also easily leads to secondary pollution, necessitating urgent optimization and improvement.

[0003] The active ingredient in label pulp is plant-based fiber, which can be used to prepare wood-plastic composites. To enhance product added value, functional modification is usually required, with antibacterial properties being an important functional indicator. Zinc oxide, as a highly efficient and safe broad-spectrum antibacterial agent, can be loaded onto the surface of plant-based fibers via a hydrothermal in-situ method to impart antibacterial properties to the fibers. For example, the invention patent published by the State Intellectual Property Office, "A Method for Preparing Bacterial Cellulose Dressing with Antibacterial and Bacteriostatic Functions" {Patent No.: CN201910470097.5}, mainly includes steps such as co-precipitation, hydrothermal reaction, solid-liquid separation, and drying. However, existing methods generally suffer from the problem of excessively large zinc oxide particle size. Therefore, optimizing hydrothermal process parameters, shortening the preparation cycle, and reducing zinc oxide particle size have become critical technical bottlenecks that urgently need to be overcome in this field.

[0004] Furthermore, the weak interfacial bonding between the zinc oxide loaded on the fiber surface and the polypropylene matrix significantly reduces the mechanical properties of polypropylene-based wood-plastic composites. Another key challenge in achieving high performance in this material is how to improve the dispersion and interfacial compatibility of antibacterial cellulose in the polymer matrix while maintaining its antibacterial function, thereby enhancing the overall mechanical properties of the wood-plastic composite.

[0005] In summary, based on the structural and performance characteristics of all components of medical infusion bags, developing a functional masterbatch with a simple and efficient process that can produce both high strength and excellent antibacterial properties to meet the needs of actual industrial production is a key path to achieving its high-value recycling. Summary of the Invention

[0006] This invention addresses the technical problems existing in the recycling process of medical infusion bags mentioned above, and proposes a method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by recycling all components of medical infusion bags. This method is rationally designed, simple in structure, easy to process, and can achieve efficient recycling of all components of medical infusion bags, including plastic and paper labels. It simplifies the processing technology, improves the function and performance of the recycled products, expands their application scope, and realizes the resource utilization and high-value utilization of medical waste.

[0007] To achieve the above objectives, the technical solution adopted by this invention is a method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch through the complete component recovery of medical infusion bags, comprising the following steps:

[0008] (1) Medical infusion bag recycling and classification pretreatment: Collect waste medical infusion bags, remove impurities, and use a combined process of water washing to remove labels, hydraulic flotation and centrifugal separation to separate plastic substrate and paper label; wherein, the water level of hydraulic flotation is controlled at 30~50cm, the flotation time is 15~25min, the speed of centrifugal separation is controlled at 1500~2500rpm, and the separation time is 5~8min;

[0009] (2) Pulp modification and spray drying: The label pulp obtained in step (1) is mixed with a soluble zinc salt solution and stirred for 0-2 hours, then centrifuged at 1500-2500 rpm for 5-8 minutes to remove zinc salts not adsorbed by the pulp fibers; ammonia water is added to the system to adjust the pH value to 8-13, and stirring is continued for 0-2 hours; then high-pressure spray drying is carried out, and the spray drying conditions are: inlet air temperature 180-220℃, outlet air temperature 80-100℃, atomization pressure 0.3-0.5MPa, and feed rate 15-25mL / min; finally, antibacterial paper fiber powder with a particle size of 100-150 mesh and a moisture content ≤0.3% is obtained;

[0010] (3) Crushing of plastic: The plastic substrate obtained in step (1) is crushed at low temperature. The crushing conditions are: temperature -20~-2℃, rotation speed 2500~3000rpm. After crushing, small plastic pieces with a particle size of 2~4mm are obtained.

[0011] (4) Blending and granulation: By weight, 100 parts of the plastic flakes obtained in step (3), 18 to 25 parts of the antibacterial paper fiber powder obtained in step (2), and 2 to 4 parts of compatibilizer are mixed evenly and granulated by twin-screw extrusion to obtain antibacterial high-performance wood-plastic masterbatch.

[0012] Preferably, in step (1), the plastic substrate is copolymer polypropylene used in discarded medical infusion bags; the paper label is medical-grade kraft paper or coated paper.

[0013] Preferably, in step (2), the concentration of the soluble zinc salt solution is 0.01~1mol / L, and the mass ratio of label pulp to zinc salt solution is 1:0.01~1:10.

[0014] Preferably, in step (2), the soluble zinc salt is at least one of zinc sulfate, zinc chloride, zinc nitrate, and zinc stearate, and the high-pressure spray drying uses a centrifugal atomizer with a rotation speed of 12,000 to 15,000 rpm.

[0015] Preferably, in step (4), the compatibilizer is a polyolefin containing maleic anhydride groups, and is at least one of maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, and maleic anhydride-grafted polyolefin elastomer.

[0016] Preferably, in step (4), the temperature of each section of the twin-screw extruder is controlled at 150~185℃ and the screw speed is 200~250rpm.

[0017] As a preferred option, an antibacterial high-performance wood-plastic composite masterbatch is also included. This masterbatch is prepared using a method that involves the complete recycling of components from medical infusion bags to produce a flame-retardant and antibacterial high-performance wood-plastic composite masterbatch. The wood-plastic composite masterbatch meets the following performance requirements: yield strength ≥ 25 MPa, tensile strength ≥ 30 MPa, elongation at break ≥ 500%, flexural strength ≥ 35 MPa, and impact strength ≥ 8.0 kJ / m². Its antibacterial properties meet the requirements of GB / T21510-2008 standard, with antibacterial rates against Escherichia coli and Staphylococcus aureus both ≥ 99%.

[0018] As a preferred option, the application of an antibacterial high-performance wood-plastic masterbatch is also included, which is used to prepare non-food contact consumables such as trays, partition boards, and packaging shells.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0020] 1. This invention provides a method for preparing flame-retardant and antibacterial high-performance wood-plastic composite material from the complete recycling of medical infusion bags. This method achieves efficient recycling of all components of medical infusion bags, significantly improving resource utilization. It adopts a combined process of water washing and label removal, hydraulic flotation, and centrifugal separation, which has high paper-plastic separation efficiency. This solves the technical problem of residual plastic debris in label pulp in traditional processes. It transforms label pulp, which is traditionally treated as waste and incinerated or landfilled, into high-value functional filler. This method improves resource utilization compared to traditional infusion bag recycling processes, while reducing solid waste emissions and avoiding secondary pollution.

[0021] 2. An innovative in-situ loading process for nano-zinc oxide on pulp was developed, simultaneously improving preparation efficiency and antibacterial performance: Zinc ions are loaded onto the pulp fibers using their adsorption properties. Zinc hydroxide is generated in situ by adjusting the pH value with ammonia water. Then, high-pressure spray drying is used to achieve pulp drying and the crystal transformation of zinc hydroxide into nano-zinc oxide in one step. The preparation cycle is shortened compared to the traditional hydrothermal method. The resulting zinc oxide particles are nano-sized with uniform and controllable particle size and no agglomeration. The antibacterial paper fiber powder obtained has an antibacterial rate of ≥99% against Escherichia coli and Staphylococcus aureus, which is higher than the performance level of conventional antibacterial fibers in the industry.

[0022] 3. By utilizing the complexation effect of a compatibilizer containing maleic anhydride groups with zinc oxide on the surface of antibacterial paper fiber powder, the dispersion uniformity of antibacterial paper fiber powder in plastic substrate is improved, and the interfacial bonding strength between fiber and plastic is significantly enhanced. Compared with the control group without compatibilizer, the wood-plastic masterbatch prepared by this invention has improved yield strength, tensile strength, elongation at break, flexural strength, and impact strength. At the same time, the antibacterial properties are further consolidated due to the improved fiber dispersion, achieving the dual goals of "high strength + high antibacterial".

[0023] 4. Significantly enhances the economic value of recycled products and has broad prospects for industrial application: This method has a simple process and highly versatile equipment. No new large-scale special equipment is required. The prepared masterbatch can be directly used to produce a variety of non-food contact consumables, greatly expanding the application scenarios of medical infusion bag recycled products, and has both significant economic and environmental benefits. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the stretching curves of Embodiments 1-3 and Comparative Example 1 provided by the present invention. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0028] Examples, such as Figure 1 The diagram shows the test results of antibacterial high-performance wood-plastic composite masterbatch prepared by a method of full-component recovery of medical infusion bags. In each embodiment, the raw materials used are all conventional commercial products, and the test methods all adopt the corresponding national standards.

[0029] Example 1: This example provides a method for preparing antibacterial high-performance wood-plastic masterbatch by fully recovering all components of a medical infusion bag. The specific steps are as follows:

[0030] (1) Medical infusion bag recycling and graded pretreatment: Waste polypropylene medical infusion bags were collected. After manually removing residual medicine, metal buckles and other impurities from the infusion bags, a combined process of water washing to remove labels, hydraulic flotation and centrifugal separation was used for separation. The water level of hydraulic flotation was controlled at 30 cm and the flotation time was 15 min. The density difference between plastic and paper labels was used to achieve preliminary separation. The speed of centrifugal separation was controlled at 1500 rpm and the separation time was 5 min. Polypropylene plastic substrate and medical grade kraft paper labels were further separated, with a separation efficiency of 99.2%.

[0031] (2) Pulp modification and spray drying: The medical-grade kraft paper labels obtained in step (1) are crushed and pulped to obtain label pulp; 100g of label pulp is mixed with 1000g of zinc sulfate solution with a concentration of 0.01mol / L and stirred for 1 hour; then centrifuged at 1500rpm for 5min to remove zinc sulfate that was not adsorbed by the pulp fibers; ammonia water is added to the centrifuged system to adjust the pH value to 8 and continue stirring for 1 hour; high-pressure spray drying is carried out using a centrifugal atomizer with a speed of 12000rpm and spray drying conditions of: inlet air temperature 180℃, outlet air temperature 80℃, atomization pressure 0.3MPa, and feed rate 15mL / min; finally, antibacterial paper fiber powder with a particle size of 100 mesh and a moisture content of 0.25% is obtained.

[0032] (3) Crushing of plastic: The polypropylene plastic substrate obtained in step (1) is placed in a low temperature environment of -8℃ and crushed at a speed of 2500rpm. After crushing, polypropylene plastic flakes with a particle size of 2mm are obtained.

[0033] (4) Blending and granulation: By weight, take 100 parts of polypropylene plastic flakes, 18 parts of antibacterial paper fiber powder, and 2 parts of maleic anhydride grafted polypropylene compatibilizer, and put them into a high-speed mixer and mix them evenly (mixing speed 1000 rpm, mixing time 5 min); send the mixture into a twin-screw extruder for extrusion granulation, control the temperature of each section of the extruder to 160~180℃, and the screw speed to 200 rpm, and obtain antibacterial high-performance wood-plastic masterbatch after granulation.

[0034] The performance of the wood-plastic masterbatch prepared in this embodiment was tested. The results showed that the yield strength was 27.2 MPa, the tensile strength was 31.5 MPa, the elongation at break was 529%, the flexural strength was 38.2 MPa, and the impact strength was 8.1 kJ / m². The antibacterial properties met the requirements of GB / T21510-2008 standard, with antibacterial rates of 99.1% and 99.2% against Escherichia coli and Staphylococcus aureus, respectively.

[0035] Example 2: This example provides a method for preparing antibacterial high-performance wood-plastic masterbatch by fully recovering all components of medical infusion bags. The specific steps are as follows:

[0036] (1) Medical infusion bag recycling and graded pretreatment: waste polypropylene medical infusion bags were collected, and after removing impurities manually, they were separated by a combined process of water washing to remove labels, hydraulic flotation and centrifugal separation. The hydraulic flotation water level was controlled at 40 cm and the flotation time was 20 min. The centrifugal separation speed was 2000 rpm and the separation time was 6 min. Polypropylene plastic substrate and medical-grade coated paper labels were separated, with a separation efficiency of 99.5%.

[0037] (2) Pulp modification and spray drying: Take 100g of coated paper label pulp and mix it with 500g of zinc chloride solution with a concentration of 0.5mol / L. Stir for 0.5 hours. Centrifuge at 2000rpm for 6min to remove unadsorbed zinc chloride. Add ammonia to adjust the pH value to 10 and continue stirring for 2 hours. High-pressure spray drying is carried out using a centrifugal atomizer with a speed of 13500rpm. The spray drying conditions are: inlet air temperature 200℃, outlet air temperature 90℃, atomization pressure 0.4MPa, and feed rate 20mL / min. Finally, antibacterial paper fiber powder with a particle size of 120 mesh and a moisture content of 0.2% is obtained.

[0038] (3) Crushing of plastic: The polypropylene plastic substrate was placed in a low temperature environment of -5℃ and crushed at a speed of 2750rpm to obtain polypropylene plastic flakes with a particle size of 3mm.

[0039] (4) Blending and granulation: By weight, take 100 parts of polypropylene plastic flakes, 22 parts of antibacterial paper fiber powder, and 3 parts of maleic anhydride grafted polyethylene compatibilizer, mix them evenly at high speed, and then feed them into a twin-screw extruder for granulation. The temperature of each section of the extruder is 150~170℃, and the screw speed is 220rpm to obtain antibacterial high-performance wood-plastic masterbatch.

[0040] Performance test results: Yield strength is 26.9 MPa, tensile strength is 32.3 MPa, elongation at break is 563%, flexural strength is 37.5 MPa, and impact strength is 8.6 kJ / m²; the antibacterial properties meet the requirements of GB / T21510-2008 standard, with antibacterial rates of 99.4% and 99.5% against Escherichia coli and Staphylococcus aureus, respectively.

[0041] Example 3: This example provides a method for preparing antibacterial high-performance wood-plastic masterbatch by fully recovering all components of medical infusion bags. The specific steps are as follows:

[0042] (1) Medical infusion bag recycling and classification pretreatment: waste polypropylene medical infusion bags were collected, and after removing impurities, they were separated by a combined process of water washing to remove labels, hydraulic flotation and centrifugal separation. The hydraulic flotation water level was 50cm and the flotation time was 25min. The centrifugal separation speed was 2500rpm and the separation time was 8min. The composite plastic substrate and medical grade kraft paper label were separated, and the separation efficiency reached 99.3%.

[0043] (2) Pulp modification and spray drying: Take 100g of label pulp and mix it with 10g of zinc nitrate solution with a concentration of 1mol / L. Stir for 2 hours; centrifuge at 2500rpm for 8min to remove unadsorbed zinc nitrate; add ammonia to adjust the pH value to 13 and continue stirring for 2 hours; use a centrifugal atomizer for high-pressure spray drying at 15000rpm. The spray drying conditions are: inlet air temperature 220℃, outlet air temperature 100℃, atomization pressure 0.5MPa, and feed rate 25mL / min; finally, antibacterial paper fiber powder with a particle size of 150 mesh and a moisture content of 0.18% is obtained.

[0044] (3) Crushing of plastic: The composite plastic substrate is placed in a low temperature environment of -2℃ and crushed at a speed of 3000rpm to obtain plastic flakes with a particle size of 4mm.

[0045] (4) Blending and granulation: By weight, take 100 parts of composite plastic flakes, 25 parts of antibacterial paper fiber powder, and 4 parts of maleic anhydride grafted polyolefin elastomer compatibilizer, mix them evenly, and then granulate them by twin-screw extrusion. The temperature of each section of the extruder is 165~185℃ and the screw speed is 250rpm to obtain antibacterial high-performance wood-plastic masterbatch.

[0046] Performance test results: yield strength is 26.8 MPa, tensile strength is 33.1 MPa, elongation at break is 598%, flexural strength is 37.2 MPa, and impact strength is 8.8 kJ / m²; the antibacterial properties meet the requirements of GB / T21510-2008 standard, and the antibacterial rate against Escherichia coli and Staphylococcus aureus is 99.6%.

[0047] Comparative Example 1: The difference between this comparative example and Example 2 is that no compatibilizer is added, but the remaining steps and parameters are completely consistent with Example 2.

[0048] Performance test results: Yield strength was 16.6 MPa, tensile strength was 26.8 MPa, elongation at break was 350%, flexural strength was 27.5 MPa, and impact strength was 6.8 kJ / m²; the antibacterial rate was 98.2% (Escherichia coli) and 98.3% (Staphylococcus aureus), both of which did not meet the antibacterial performance requirements of GB / T21510-2008. This indicates that the complexation effect between the maleic anhydride group and zinc oxide in the compatibilizer plays a key role in improving the mechanical and antibacterial properties of the wood-plastic composite masterbatch.

[0049] In the above process:

[0050] 1. Achieves efficient recycling of all components of infusion bags and improves resource utilization: This invention uses the by-product of infusion bag recycling—label paper—as a functional filler for resource reuse, effectively improving the mechanical properties of recycled materials, achieving efficient recycling and utilization of all components of infusion bags, solving the problem that label paper is difficult to utilize at high value due to the presence of plastic fragments, and breaking the dilemma of label paper being treated as waste in traditional recycling.

[0051] 2. Enhanced Antibacterial Properties of Pulp Loading: This invention utilizes the excellent adsorption properties of pulp fibers to efficiently adsorb zinc ions onto the fiber surface. After centrifugation to remove unadsorbed zinc salts, a measured amount of ammonia is added, causing the zinc ions on the fiber surface to generate nano-sized zinc hydroxide particles in situ. Subsequently, during high-pressure spray drying, the zinc hydroxide particles on the fiber surface undergo an in-situ dehydration reaction, transforming into zinc oxide particles with excellent antibacterial properties. This process not only solves the technical problem of uncontrollable crystal form and particle size in the traditional hydrothermal method for preparing nano-zinc oxide, but also combines the dual functions of pulp drying and accelerating the crystallization transformation of zinc oxide during high-pressure spraying, achieving a balance between high process efficiency and controllable product performance.

[0052] 3. Simultaneous Improvement of Function and Performance: This invention not only realizes the high-value utilization of by-product label pulp and effectively reduces waste emissions, but also, through the complexation of maleic anhydride groups in the compatibilizer with zinc oxide on the surface of antibacterial paper fiber powder, significantly improves the dispersion uniformity of antibacterial paper fiber powder in recycled plastic substrates and enhances the interfacial bonding force between antibacterial paper fibers and recycled plastic substrates. As a result, the prepared wood-plastic masterbatch has both excellent mechanical properties and antibacterial properties (antibacterial rate ≥99%), breaking the limitations of traditional infusion bag recycling products being "low-value and single-function". It truly realizes the high-value and functional utilization of infusion bag recycling products, significantly improving the economic and environmental value of this recycling process.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by fully recovering all components of a medical infusion bag, characterized in that, Includes the following steps: (1) Medical infusion bag recycling and graded pretreatment: Collect waste medical infusion bags, remove impurities, and use a combined process of water washing to remove labels, hydraulic flotation and centrifugal separation to separate plastic substrate and paper label; wherein, the water level of hydraulic flotation is controlled at 30~50cm, the flotation time is 15~25min, the speed of centrifugal separation is controlled at 1500~2500rpm, and the separation time is 5~8min; (2) Pulp modification and spray drying: The label pulp obtained in step (1) is mixed with a soluble zinc salt solution and stirred for 0-2 hours, then centrifuged at 1500-2500 rpm for 5-8 minutes to remove zinc salts not adsorbed by the pulp fibers; ammonia water is added to the system to adjust the pH value to 8-13, and stirring is continued for 0-2 hours; then high-pressure spray drying is carried out, and the spray drying conditions are: inlet air temperature 180-220℃, outlet air temperature 80-100℃, atomization pressure 0.3-0.5MPa, and feed rate 15-25mL / min; finally, antibacterial paper fiber powder with a particle size of 100-150 mesh and a moisture content ≤0.3% is obtained; (3) Crushing of plastic: The plastic substrate obtained in step (1) is crushed at low temperature. The crushing conditions are: temperature -20~-2℃, speed 2500~3000rpm. After crushing, small plastic pieces with a particle size of 2~4mm are obtained. (4) Blending and granulation: By weight, 100 parts of the plastic flakes obtained in step (3), 18 to 25 parts of the antibacterial paper fiber powder obtained in step (2), and 2 to 4 parts of compatibilizer are mixed evenly and granulated by twin-screw extrusion to obtain antibacterial high-performance wood-plastic masterbatch.

2. The method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by fully recovering all components of a medical infusion bag according to claim 1, characterized in that, In step (1), the plastic substrate is copolymer polypropylene used in discarded medical infusion bags; the paper label is medical-grade kraft paper or coated paper.

3. The method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by fully recovering all components of a medical infusion bag according to claim 1, characterized in that, In step (2), the concentration of the soluble zinc salt solution is 0.01~1mol / L, and the mass ratio of label pulp to zinc salt solution is 1:0.01~1:

10.

4. A method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by fully recovering all components of a medical infusion bag according to claim 1 or 3, characterized in that, In step (2), the soluble zinc salt is at least one of zinc sulfate, zinc chloride, zinc nitrate, and zinc stearate, and the high-pressure spray drying uses a centrifugal atomizer with a rotation speed of 12,000 to 15,000 rpm.

5. The method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by fully recovering all components of a medical infusion bag according to claim 1, characterized in that, In step (4), the compatibilizer is a polyolefin containing maleic anhydride groups, and is at least one of maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, and maleic anhydride-grafted polyolefin elastomer.

6. The method for preparing flame-retardant and antibacterial high-performance wood-plastic masterbatch by fully recovering all components of a medical infusion bag according to claim 1, characterized in that, In step (4), the temperature of each section of the twin-screw extruder is controlled at 150~185℃ and the screw speed is 200~250rpm.

7. An antibacterial high-performance wood-plastic masterbatch, characterized in that, The wood-plastic masterbatch is prepared by the method described in any one of claims 1 to 6, and the performance indicators of the masterbatch meet the following requirements: yield strength ≥ 25 MPa, tensile strength ≥ 30 MPa, elongation at break ≥ 500%, flexural strength ≥ 35 MPa, impact strength ≥ 8.0 kJ / m²; and the antibacterial properties are ≥ 99% against Escherichia coli and Staphylococcus aureus.

8. The application of the antibacterial high-performance wood-plastic masterbatch as described in claim 7, characterized in that, The wood-plastic masterbatch is used to prepare non-food contact consumables such as trays, partition boards, and packaging shells.

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