Antibacterial material, antibacterial polyethylene material, antibacterial polyethylene film and preparation method and application thereof

Abstract

The invention discloses an antibacterial material, an antibacterial polyethylene material, an antibacterial polyethylene film as well as a preparation method and application thereof, belongs to the technical field of antibacterial polyethylene, and overcomes the defects that chitosan is directly adopted as an antibacterial material in the prior art, and the antibacterial performance of polyethylene is limited and is not durable. The antibacterial material comprises an inner core and a coating layer, the inner core is talcum powder, and the coating layer comprises crosslinked ultra-high molecular weight polyethylene and crosslinked chitosan. According to the antibacterial material, the antibacterial performance of the antibacterial polyethylene film can be improved, and the antibacterial durability is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of antibacterial polyethylene technology, specifically relating to an antibacterial material, an antibacterial polyethylene material, an antibacterial polyethylene film, its preparation method and application. Background Technology

[0002] Polyethylene is a commonly used polymer material for packaging, known for its good processability, stability, and resistance to chemical corrosion. However, polyethylene itself is inert and does not inhibit the growth of bacteria and other microorganisms, which limits its further application and development as a sterile packaging material.

[0003] In existing technologies, adding components with antibacterial properties, such as chitosan, to polyethylene can give it a certain degree of inhibition against bacteria and other microorganisms. However, the improvement in the antibacterial performance of polyethylene is limited and not lasting. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art in which chitosan is directly used as an antibacterial material, which has limited and unsustainable improvement on the antibacterial performance of polyethylene. Thus, the present invention provides an antibacterial material, an antibacterial polyethylene material, an antibacterial polyethylene film, and its preparation method and application.

[0005] To this end, the present invention provides the following technical solution.

[0006] In a first aspect, this application provides an antibacterial material comprising a core and a coating layer, wherein the core is talc and the coating layer comprises cross-linked ultra-high molecular weight polyethylene and cross-linked chitosan.

[0007] In one possible implementation, based on the mass of the antibacterial material, the core has a mass content of 50-90%, and the coating layer has a mass content of 10-50%. In one possible implementation, the mass ratio of the cross-linked ultra-high molecular weight polyethylene to the cross-linked chitosan is (0.5~2):1.

[0008] In one possible implementation, the coating layer is an interpenetrating network structure formed by cross-linked ultra-high molecular weight polyethylene and cross-linked chitosan; In one possible implementation, the crosslinked ultra-high molecular weight polyethylene is crosslinked from ultra-high molecular weight polyethylene with a weight average molecular weight of 1 million to 8 million. In one possible implementation, the cross-linked chitosan is formed by cross-linking chitosan with a weight-average molecular weight of 1 million to 3 million; In one possible implementation, the talc powder has a particle size of 3000-5000 mesh.

[0009] Secondly, this application provides a method for preparing an antibacterial material, comprising the following steps: S1. Mix the ultra-high molecular weight polyethylene with a good solvent to prepare a first solution; S2. Add the talc powder to the first solution and sonicate to obtain a composite suspension; S3. Spray the composite suspension into a poor solvent, and the ultra-high molecular weight polyethylene crystallizes out, and solid product is obtained by solid-liquid separation. S4. The solid product is subjected to crosslinking treatment to obtain talc powder coated with ultra-high molecular weight polyethylene. S5. The talc powder coated with ultra-high molecular weight polyethylene is added to an acidic aqueous solution of chitosan, reacted, and separated into solid and liquid components. The resulting solid product is washed with an alkaline solution to obtain the antibacterial material.

[0010] In one possible implementation, in S1, the concentration of the first solution is 1 × 10⁻⁶. -3 ~1×10 -5 g / mL; In one possible implementation, in S1, the good solvent includes one or more of white oil, decahydronaphthalene, and toluene; In one possible implementation, in S2, the amount of talc powder added to the first solution is 1~10 g / L; In one possible implementation, in S3, the composite suspension is sprayed into the unsuitable solvent using a sprayer; Optionally, the sprayer uses a nozzle with an orifice diameter of 15μm to 30μm and a pressure of 0.1 to 1MPa; In one possible implementation, in S3, the undesirable solvent includes one or more of diphenyl ether (DPE), di-n-octyl phthalate (DOP), and diisodecyl phthalate (DIDP); In one possible implementation, in S3, the conditions for the crystallization and precipitation of the ultra-high molecular weight polyethylene are: stirring at 30~50°C for 30 min~3 h. Optionally, the stirring rate is 30~300 r / min; In one possible implementation, after solid-liquid separation, step S3 further includes washing the solid product multiple times with an organic solvent. Optionally, the organic solvent includes one or more of ethanol, methanol, isopropanol, and acetone; Due to the rapid extraction effect of organic solvents, a certain microporous structure will exist on the surface of the talc coating layer when the solid product is washed with organic solvents in S3. Chitosan is dispersed in the pores during coating and forms an interpenetrating network structure with cross-linked ultra-high molecular weight polyethylene after cross-linking. Since chitosan is a polar material, its dispersibility in non-polar PE films is poor, and it may agglomerate, affecting the film's appearance and performance. Forming an interpenetrating network with cross-linked ultra-high molecular weight polyethylene can improve its compatibility in PE films, resulting in more uniform dispersion. The mutual anchoring of the interpenetrating networks also makes the structure more stable and prevents the shell layer from peeling off.

[0011] Optionally, the solid product may be washed 3 to 5 times with an organic solvent; Optionally, the solid product may be dried after washing; In one possible implementation, in S4, the crosslinking treatment of the solid product includes irradiating the solid product obtained in S3 with an electron accelerator at a dose of 5-10 kGy. In one possible implementation, in S5, the mass ratio of talc powder coated with ultra-high molecular weight polyethylene to chitosan in the acidic aqueous solution of chitosan is 1:10 to 1:50. In one possible implementation, in S5, the degree of deacetylation of chitosan in the acidic aqueous solution of chitosan is ≥95%; In one possible implementation, in S5, the acid in the chitosan acidic aqueous solution includes one or more of citric acid, malic acid, fumaric acid, and tartaric acid. In one possible implementation, in step S5, the concentration of acid in the chitosan acidic aqueous solution is 0.5~3 mol / L; In one possible implementation, in S5, the reaction conditions are 60-80°C with mechanical stirring at 30-300 r / min for 1-5 h; In one possible implementation, in step S5, the talc powder coated with ultra-high molecular weight polyethylene is added to an acidic aqueous solution of chitosan and then ultrasonically dispersed for 30 min to 3 h.

[0012] Thirdly, this application provides an antibacterial polyethylene material, comprising, by weight, 100-120 parts of linear low-density polyethylene, 0.1-0.5 parts of antibacterial material, and 0.02-0.2 parts of slip agent; The antibacterial material is the antibacterial material described above or the antibacterial material prepared according to the method described above.

[0013] In one possible implementation, the slip agent comprises one or more amide slip agents; optionally, the slip agent comprises one or more of erucamide, oleamide, and behenamide. In one possible implementation, the linear low-density polyethylene has a melt index of 0.5~5 g / 10 min.

[0014] Fourthly, this application provides a method for preparing an antibacterial polyethylene material, comprising: mixing linear low-density polyethylene, antibacterial material, and slip agent, and then using a twin-screw granulator for mixing and granulation; In one possible implementation, the granulation temperature is 170~210°C.

[0015] Fifthly, this application provides an antibacterial polyethylene film, the raw materials comprising, by weight: 50-80 parts of antibacterial polyethylene material; 3-10 parts of high-density polyethylene; 5-20 parts of high-pressure low-density polyethylene; Metallocene polyethylene 5-20 parts.

[0016] Sixthly, this application provides a method for preparing an antibacterial polyethylene film, comprising: mixing raw materials and then blowing the film using a blown film machine, with a blowing temperature of 190~230℃ and a blowing film thickness of 10~150μm.

[0017] Seventhly, this application provides the application of antibacterial polyethylene film in food and pharmaceutical packaging.

[0018] The technical solution of this invention has the following advantages: (1) The antibacterial material of this application includes a core and a coating layer, wherein the core is talc and the coating layer includes cross-linked ultra-high molecular weight polyethylene and cross-linked chitosan.

[0019] This antibacterial material uses talc as its core, with layered talc evenly distributed within a polyethylene film and embedded in the polyethylene matrix, preventing it from detaching from the film. Chitosan, upon contact with the environment or food containing bacteria, exerts antibacterial and bactericidal effects, effectively preventing bacterial growth on the film surface. Furthermore, ultra-high molecular weight polyethylene (UHMWPE) is hydrophobic, and coating the talc surface with cross-linked UHMWPE further enhances its antibacterial properties. The cross-linked UHMWPE coating of talc also increases the film's abrasion resistance and extends its service life, while the self-lubricating effect of UHMWPE improves the film's slip properties.

[0020] (2) In S3, after solid-liquid separation, the solid product is washed multiple times with an organic solvent. Due to the rapid extraction effect of the organic solvent, a certain microporous structure will exist on the surface of the talc coating layer when the solid product is washed with an organic solvent in S3. Chitosan is dispersed in the pores during coating and forms an interpenetrating network structure with cross-linked ultra-high molecular weight polyethylene after cross-linking. Since chitosan is a polar material, its dispersion in non-polar PE films is poor and it may agglomerate, affecting the appearance and performance of the film. Forming an interpenetrating network with cross-linked ultra-high molecular weight polyethylene can improve its compatibility in PE films and make the dispersion more uniform. The mutual anchoring of the interpenetrating network can also make the structure more stable and prevent the shell from peeling off. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is an EDS elemental scan of the antibacterial polyethylene film of Example 7 (the oxygen element signal position indicates the distribution position of the antibacterial material). Detailed Implementation

[0023] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0024] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0025] Source of raw materials Talc powder: purchased from Liaoning Xinda Talc Group Co., Ltd., 3000 mesh, 4000 mesh, 5000 mesh, industrial grade; Ultra-high molecular weight polyethylene (UHMWPE): Mw=6 million, grade S600, purchased from Lianhong New Material Technology Co., Ltd. Chitosan: Mw=1 million, degree of deacetylation ≥95%, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. Linear low-density polyethylene (LLDPE): grade DFDA 7042, purchased from Wanhua Chemical Group (Yantai) Olefins Co., Ltd. Amide-based slip agents: erucamide, oleamide, purity >90%, purchased from Sichuan Ripu Fine Chemicals Co., Ltd.; High-density polyethylene (HDPE): Grade 7000F, purchased from Wanhua Chemical Group (Yantai) Olefins Co., Ltd.; High-pressure low-density polyethylene (LDPE): Grade 2420H, purchased from Wanhua Chemical Group (Yantai) Olefins Co., Ltd. Metallocene polyethylene (mPE): Grade 2018MA, purchased from ExxonMobil.

[0026] Example 1 This embodiment provides a method for preparing an antibacterial material, including: S1. Mix ultra-high molecular weight polyethylene (UHMWPE) with toluene and stir at 50°C for 1 hour to obtain a concentration of 1×10⁻⁶. -3 The first solution was prepared at a concentration of g / mL.

[0027] S2. Add 1g of talc powder with a particle size of 4000 mesh to 1L of the first solution, and sonicate to suspend and disperse the talc powder components to obtain a composite suspension.

[0028] S3. Add the composite suspension to the sprayer, using a nozzle with a 20μm aperture and a pressure of 0.5MPa, and spray the composite suspension into diphenyl ether. Stir at 200r / min for 1.5h at 30℃, filter, wash the precipitate three times with ethanol, and dry.

[0029] S4. The product of S3 was irradiated using an electron accelerator at a dose of 8 kGy to obtain UHMWPE-coated talc. Irradiation caused micro-crosslinking of the UHMWPE, preventing it from detaching from the talc surface or melting during processing. The product was weighed, with a mass of 1.67 g (1 g core, 0.67 g crosslinked ultra-high molecular weight polyethylene).

[0030] S5. Dissolve 10g of chitosan in 1L of 1mol / L citric acid aqueous solution to obtain an acidic chitosan aqueous solution. Add 1g of UHMWPE-coated talc obtained in S4 to the solution. After ultrasonic dispersion for 1h, heat the suspension to 80℃ and stir at 200 r / min for 3h. Filter the solution to obtain the precipitate. Wash three times with pure water, then wash with 1mol / L sodium hydroxide to allow the cross-linked chitosan to precipitate and solidify, resulting in an interwoven network shell structure of cross-linked chitosan and cross-linked UHMWPE. Finally, wash with pure water until neutral and dry to obtain the antibacterial material. Weigh the product; the mass is 1.2g (core 0.6g, cross-linked ultra-high molecular weight polyethylene 0.4g, cross-linked chitosan 0.2g). Calculate that the core and coating content of the antibacterial material are 50% and 50% respectively, and the mass ratio of cross-linked ultra-high molecular weight polyethylene to cross-linked chitosan is 2:1.

[0031] Example 2 This embodiment provides a method for preparing an antibacterial material, including: S1. Mix ultra-high molecular weight polyethylene (UHMWPE) with white oil and stir at 55°C for 3 hours to obtain a concentration of 1×10⁻⁶. -5 The first solution was prepared at a concentration of g / mL.

[0032] S2. Add 10g of talc powder with a particle size of 5000 mesh to 1L of the first solution, and use ultrasound to suspend and disperse the talc powder components to obtain a composite suspension.

[0033] S3. Add the composite suspension to the sprayer, using a nozzle with a 15μm aperture and a pressure of 1MPa, and spray the composite suspension into di-n-octyl phthalate. Stir at 30r / min for 3 hours at 50℃, filter, wash the precipitate 5 times with ethanol, and dry.

[0034] S4. The product of S3 was irradiated with an electron accelerator at a dose of 5 kGy to obtain UHMWPE-coated talc. Irradiation caused micro-crosslinking of the UHMWPE, preventing it from detaching from the talc surface or melting during processing. The product was weighed, with a mass of 10.49 g (10 g core, 0.49 g crosslinked ultra-high molecular weight polyethylene).

[0035] S5. Dissolve 50g of chitosan in 1L of 1mol / L malic acid aqueous solution to obtain an acidic chitosan aqueous solution. Add 1g of UHMWPE-coated talc obtained in S4 to the solution. After ultrasonic dispersion for 3h, heat the suspension to 60℃ and stir at 300 r / min for 5h. Filter the solution to obtain the precipitate. Wash three times with pure water, then wash with 1mol / L sodium hydroxide to allow the cross-linked chitosan to precipitate and solidify, resulting in an interwoven network shell structure of cross-linked chitosan and UHMWPE. Finally, wash with pure water until neutral and dry to obtain the antibacterial material. Weigh the product; the mass is 1.059g (core 0.953g, cross-linked ultra-high molecular weight polyethylene 0.047g, cross-linked chitosan 0.059g). Calculate that the core and coating content of the antibacterial material are 90% and 10%, respectively, and the mass ratio of cross-linked ultra-high molecular weight polyethylene to cross-linked chitosan is 0.8:1.

[0036] Example 3 This embodiment provides a method for preparing an antibacterial material, including: S1. Mix ultra-high molecular weight polyethylene (UHMWPE) with decahydronaphthalene and stir at 60°C for 2 hours to obtain a concentration of 5×10⁻⁶. -4 The first solution was prepared at a concentration of g / mL.

[0037] S2. Add 5g of talc powder with a particle size of 4000 mesh to 1L of the first solution, and use ultrasound to suspend and disperse the talc powder components to obtain a composite suspension.

[0038] S3. Add the composite suspension to the sprayer, using a nozzle with a 30μm aperture and a pressure of 0.1MPa, and spray the composite suspension into diisodecyl phthalate. Stir at 300r / min for 30min at 45℃, filter, wash the precipitate four times with ethanol, and dry.

[0039] S4. The product of S3 was irradiated with an electron accelerator at a dose of 10 kGy to obtain UHMWPE-coated talc. Irradiation caused micro-crosslinking of the UHMWPE, preventing it from detaching from the talc surface or melting during processing. The product was weighed, with a mass of 5.71 g (5 g core, 0.71 g crosslinked ultra-high molecular weight polyethylene).

[0040] S5. Dissolve 30g of chitosan in 1L of 1mol / L fumaric acid aqueous solution to obtain an acidic chitosan aqueous solution. Add 1g of UHMWPE-coated talc obtained in S4 to the solution. After ultrasonic dispersion for 30min, heat the suspension to 70℃ and stir at 30 r / min for 1h. Filter the solution to obtain the precipitate. Wash three times with pure water, then wash with 1mol / L sodium hydroxide to allow the cross-linked chitosan to precipitate and solidify, resulting in an interwoven network shell structure of cross-linked chitosan and UHMWPE. Finally, wash with pure water until neutral and dry to obtain the antibacterial material. Weigh the product; the mass is 1.25g (core 0.875g, cross-linked ultra-high molecular weight polyethylene 0.125g, cross-linked chitosan 0.25g). Calculate that the core and coating content of the antibacterial material are 70% and 30%, respectively, and the mass ratio of cross-linked ultra-high molecular weight polyethylene to cross-linked chitosan is 0.5:1.

[0041] Example 4 This embodiment provides a method for preparing an antibacterial polyethylene material, including: 100g of linear low-density polyethylene (LLDPE), 0.5g of the antibacterial material prepared in Example 1, and 0.2g of erucamide slip agent were mixed evenly, and then the mixture was kneaded and granulated using a twin-screw granulator at a granulation temperature of 190℃.

[0042] Example 5 This embodiment provides a method for preparing an antibacterial polyethylene material, including: 120g of linear low-density polyethylene (LLDPE), 0.1g of the antibacterial material prepared in Example 2, and 0.05g of oleamide slip agent were mixed evenly, and then the mixture was kneaded and granulated using a twin-screw granulator at a granulation temperature of 170°C.

[0043] Example 6 This embodiment provides a method for preparing an antibacterial polyethylene material, including: 110g of linear low-density polyethylene (LLDPE), 0.3g of the antibacterial material prepared in Example 3, and 0.1g of erucamide slip agent were mixed evenly, and then the mixture was kneaded and granulated using a twin-screw granulator at a granulation temperature of 210℃.

[0044] Example 7 This embodiment provides a method for preparing an antibacterial polyethylene film, including: 50g of the antibacterial polyethylene material prepared in Example 4, 3g of high-density polyethylene (HDPE), 20g of low-density polyethylene (LDPE), and 20g of metallocene polyethylene (mPE) were mixed and blown into a film using a blown film machine at a blowing temperature of 210°C and a film thickness of 50μm.

[0045] Depend on Figure 1 It can be seen that the antibacterial material is uniformly dispersed within the film.

[0046] Example 8 This embodiment provides a method for preparing an antibacterial polyethylene film, including: 80g of the antibacterial polyethylene material prepared in Example 5, 5g of high-density polyethylene (HDPE), 10g of low-density polyethylene (LDPE), and 5g of metallocene polyethylene (mPE) were mixed and blown into a film using a blown film machine at a blowing temperature of 190°C and a film thickness of 10μm.

[0047] Example 9 This embodiment provides a method for preparing an antibacterial polyethylene film, including: 65g of the antibacterial polyethylene material prepared in Example 6, 10g of high-density polyethylene (HDPE), 5g of low-density polyethylene (LDPE), and 10g of metallocene polyethylene (mPE) were mixed and blown into a film using a blown film machine at a blowing temperature of 230°C and a film thickness of 150μm.

[0048] Comparative Example 1 This comparative example provides a method for preparing an antibacterial polyethylene film, which is basically the same as that in Example 7, except that the preparation method of the antibacterial material is different, specifically including: 10g of chitosan was dissolved in 1L of 1mol / L citric acid aqueous solution to obtain an acidic chitosan aqueous solution. 1g of talc powder was added to the solution, and the mixture was ultrasonically dispersed for 1 hour. The suspension was then heated to 80℃ and stirred at a constant temperature of 200 r / min for 3 hours. The precipitate was obtained by hot filtration. The precipitate was washed three times with pure water, then washed with 1mol / L sodium hydroxide, and finally washed with pure water until neutral. After drying, the antibacterial material was obtained.

[0049] Comparative Example 2 This comparative example provides a method for preparing an antibacterial polyethylene film, which is basically the same as that in Example 7, except that the preparation method of the antibacterial polyethylene material is different, specifically including: Mix 100g of linear low-density polyethylene (LLDPE), 0.5g of chitosan, and 0.2g of erucamide slip agent evenly, and then use a twin-screw granulator to knead and granulate the mixture at a granulation temperature of 190℃.

[0050] Test method: 1. Antibacterial test: Refer to Appendix A of QB / T 2591-2003 "Test methods and antibacterial effects of antibacterial plastics" to test the films prepared in the examples and comparative examples and calculate the antibacterial rate.

[0051] 2. Opening smoothness: Refer to GB / T 10006-2021 "Determination of coefficient of friction of plastic films and sheets" to calculate the static friction coefficient and dynamic friction coefficient.

[0052] 3. Abrasion resistance: The film surface was polished 5 times with 3000-grit sandpaper and a contact pressure of 500Pa. The change in the coefficient of friction before and after polishing was measured.

[0053] 4. Gas barrier performance: The oxygen permeability test was conducted in accordance with GB / T 19789-2021 "Test of Oxygen Permeability of Plastic Films and Sheets for Packaging Materials by Coulometric Test".

[0054] 5. Antibacterial durability: After storing the prepared film for one month, the antibacterial rate is calculated according to Appendix A of QB / T 2591-2003 "Test methods for antibacterial properties and antibacterial effects of antibacterial plastics".

[0055] The test results are shown in Table 1.

[0056] Table 1. Properties of antibacterial polyethylene film

[0057] As shown in Table 1, the antibacterial properties and antibacterial durability of the polyethylene film of this application are significantly improved. It also has high abrasion resistance and good gas barrier properties, and the antibacterial rate deviation is small, so it can be used stably as a product.

[0058] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An antibacterial material, characterized in that, It includes a core and a coating layer, wherein the core is talc and the coating layer includes cross-linked ultra-high molecular weight polyethylene and cross-linked chitosan.

2. The antibacterial material according to claim 1, characterized in that, At least one of the following conditions must be met: (1) Based on the mass of the antibacterial material, the core has a mass content of 50-90%, and the coating layer has a mass content of 10-50%. (2) The mass ratio of the cross-linked ultra-high molecular weight polyethylene to the cross-linked chitosan is (0.5~2):1; (3) The coating layer is an interpenetrating network structure formed by cross-linked ultra-high molecular weight polyethylene and cross-linked chitosan; (4) The cross-linked ultra-high molecular weight polyethylene is cross-linked from ultra-high molecular weight polyethylene with a weight average molecular weight of 1 million to 8 million; (5) The cross-linked chitosan is formed by cross-linking chitosan with a weight-average molecular weight of 1 million to 3 million; (6) The particle size of the talc powder is 3000~5000 mesh.

3. A method for preparing the antibacterial material according to claim 1 or 2, characterized in that, Includes the following steps: S1. Mix the ultra-high molecular weight polyethylene with a good solvent to prepare a first solution; S2. Add the talc powder to the first solution and sonicate to obtain a composite suspension; S3. Spray the composite suspension into a poor solvent, and the ultra-high molecular weight polyethylene crystallizes out, and solid product is obtained by solid-liquid separation. S4. The solid product is subjected to crosslinking treatment to obtain talc powder coated with ultra-high molecular weight polyethylene. S5. The talc powder coated with ultra-high molecular weight polyethylene is added to an acidic aqueous solution of chitosan, reacted, and separated into solid and liquid components. The resulting solid product is washed with an alkaline solution to obtain the antibacterial material.

4. The method for preparing the antibacterial material according to claim 3, characterized in that, At least one of the following conditions must be met: (1) In S1, the concentration of the first solution is 1×10⁻⁶. -3 ~1×10 -5 g / mL; (2) In S1, the good solvent includes one or more of white oil, decahydronaphthalene, and toluene; (3) In S2, the amount of talc powder added to the first solution is 1~10g / L; (4) In S3, the composite suspension is sprayed into the unsuitable solvent using a sprayer; Optionally, the sprayer uses a nozzle with an orifice diameter of 15μm to 30μm and a pressure of 0.1 to 1MPa; (5) In S3, the undesirable solvent includes one or more of diphenyl ether, di-n-octyl phthalate, and diisodecyl phthalate; (6) In S3, the conditions for the crystallization of ultra-high molecular weight polyethylene are: stirring at 30~50℃ for 30min~3h; Optionally, the stirring rate is 30~300 r / min; (7) In S3, after solid-liquid separation, the solid product is washed multiple times with an organic solvent; Optionally, the organic solvent includes one or more of ethanol, methanol, isopropanol, and acetone; Optionally, the solid product may be washed 3 to 5 times with an organic solvent; Optionally, the solid product may be dried after washing; (8) In S4, the crosslinking treatment of the solid product includes irradiating the solid product obtained in S3 with an electron accelerator at a dose of 5~10kGy. (9) In S5, the mass ratio of talc powder coated with ultra-high molecular weight polyethylene to chitosan in the acidic aqueous solution of chitosan is 1:10~1:

50. (10) In S5, the degree of deacetylation of chitosan in the acidic aqueous solution of chitosan is ≥95%; (11) In S5, the acid in the acidic aqueous solution of chitosan includes one or more of citric acid, malic acid, fumaric acid, and tartaric acid; (12) In S5, the concentration of acid in the acidic aqueous solution of chitosan is 0.5~3 mol / L; (13) In S5, the reaction conditions are 60~80℃, mechanical stirring at 30~300r / min for 1~5h; (14) In S5, the talc powder coated with ultra-high molecular weight polyethylene is added to the acidic aqueous solution of chitosan and then ultrasonically dispersed for 30 min to 3 h.

5. An antibacterial polyethylene material, characterized in that, By weight, it includes 100-120 parts of linear low-density polyethylene, 0.1-0.5 parts of antibacterial material, and 0.02-0.2 parts of slip agent; The antibacterial material is the antibacterial material according to claim 1 or 2, or the antibacterial material prepared by the method according to claim 3 or 4.

6. The antibacterial polyethylene material according to claim 5, characterized in that, The slip agent includes one or more amide slip agents; optionally, the slip agent includes one or more of erucamide, oleamide, and behenamide. and / or The melt index of the linear low-density polyethylene is 0.5~5 g / 10 min.

7. A method for preparing the antibacterial polyethylene material according to claim 5 or 6, characterized in that, include: After mixing linear low-density polyethylene, antibacterial materials, and slip agents, the mixture is kneaded and granulated using a twin-screw granulator. Optionally, the granulation temperature is 170~210℃.

8. An antibacterial polyethylene film, characterized in that, Raw materials, by weight, include: 50-80 parts of antibacterial polyethylene material; wherein the antibacterial polyethylene material is the antibacterial polyethylene material according to claim 5 or 6 or the antibacterial polyethylene material prepared by the preparation method according to claim 7; 3-10 parts of high-density polyethylene; 5-20 parts of high-pressure low-density polyethylene; 5-20 parts of metallocene polyethylene.

9. A method for preparing the antibacterial polyethylene film according to claim 8, characterized in that, include: After mixing the raw materials, blown film is blown using a blown film machine at a temperature of 190~230℃ and a thickness of 10~150μm.

10. The application of the antibacterial polyethylene film of claim 8 or the antibacterial polyethylene film prepared by the method of claim 9 in food and pharmaceutical packaging.

Images