Antibacterial PE composite board and preparation method thereof

Abstract

The invention relates to an antibacterial PE composite board and a preparation method thereof, and belongs to the technical field of polymer materials. The antibacterial PE composite board comprises, by weight, 100 parts of HDPE resin, 14-18 parts of LLDPE resin, 7.5-11 parts of antibacterial modified cellulose, 1.7-2.2 parts of lubricant and 0.15-0.2 parts of antioxidant. The antibacterial modified cellulose takes microfibrillated cellulose as a matrix, is oxidized by sodium periodate, and aldehyde groups are formed on cellulose molecules, namely, aldehyded fibers are obtained, and then amine-aldehyde condensation is carried out between aliphatic chain monoamine and the introduced aldehyde groups, and alkyl aliphatic chains are introduced into the side chains of cellulose macromolecules for modification, namely, alkylated fibers are obtained, and finally, quaternization treatment is carried out by ethyl iodide. The antibacterial modified cellulose reduces crack generation of a board under the action of external force deformation, and inhibits the reproduction of fungi invading the cracks, has good antibacterial effect, and enables the board to maintain stable mechanical properties.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to an antibacterial PE composite board and a preparation method thereof. Background Art

[0002] Polyethylene (PE) is a thermoplastic resin made from the polymerization of ethylene monomers. It has the advantages of being non-toxic, chemically resistant, waterproof and moisture-proof, and is widely used in the food and medical industries. Among them, high-density polyethylene (HDPE) has high density, high hardness, and high mechanical strength, and is often used in plates, containers, and structural parts. However, HDPE is relatively brittle and is prone to microcracks or holes during the production process, thereby reducing its overall strength and service life. Organic cellulose materials are widely available, biodegradable, and environmentally friendly. After being compounded with high-density polyethylene, they can have a good strengthening and toughening effect, and have received much attention in existing research.

[0003] As the public's demand for health and safety continues to increase, existing polyethylene fiber composite materials have poor bacterial resistance and are susceptible to contamination, which seriously limits their application in food, medical and other sanitary industries. In the prior art, by introducing antibacterial agents into polyethylene materials, the composite materials can be given a certain antibacterial effect to a certain extent. However, in fiber-composite polyethylene products, the interface bonding ability between the fiber and polyethylene is relatively poor. When deformed by external forces, a large number of micro cracks are easily generated on the surface, and these micro cracks are easy to hide moisture and pollutants. Once fungi enter, they are difficult to clean and multiply in large numbers, affecting the safety of the products. At the same time, the metabolites of these fungi aggravate the corrosion process in the cracks, resulting in serious deterioration of the mechanical properties of polyethylene products. Summary of the invention

[0004] In order to solve the technical problems mentioned in the background technology, the object of the present invention is to provide an antibacterial PE composite board and a preparation method thereof.

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

[0006] An antibacterial PE composite board comprises, by weight: 100 parts of HDPE resin, 14-18 parts of LLDPE resin, 7.5-11 parts of antibacterial modified cellulose, 1.7-2.2 parts of lubricant and 0.15-0.2 parts of antioxidant;

[0007] The antibacterial modified cellulose is prepared by the following method:

[0008] Step A1: cellulose fiber and water are mixed to form a suspension, the water bath temperature is controlled at 40-50°C, stirring is applied at 180-240 rpm, and sodium periodate solution is slowly reacted for 3.5-4.5 hours in a light-proof environment. After the reaction is completed, the fiber is filtered and washed with water to obtain hydroformylation fiber;

[0009] Furthermore, the feed ratio of cellulose fiber to sodium periodate is 50g:1.4-1.9g, the solid content of the suspension is 6.5-8wt%, the concentration of the sodium periodate solution is 0.08-0.1mol / L, and the sodium periodate oxidizes the cellulose fiber to perform hydroformylation modification on the cellulose fiber.

[0010] Preferably, the cellulose fibers are selected from microfibrillated cellulose, which has good reactivity and a stable reinforcing effect on the PE matrix.

[0011] Step A2: premix aliphatic monoamine, triethylamine and chloroform, add aldehyded fiber and mix, introduce nitrogen protection, heat to 45-70°C, stir at 60-90 rpm for 12-18 hours, filter after reaction and wash with ethanol to obtain alkylated fiber;

[0012] Furthermore, the feed ratio of the hydroformylated fiber, fatty chain monoamine, triethylamine and chloroform is 50g:18-26mmol:5-10mL:150-230mL, and the fatty chain monoamine undergoes amine-aldehyde condensation with the aldehyde group in the hydroformylated fiber to introduce fatty chain modification onto the fiber.

[0013] Furthermore, the fatty chain monoamine is one of n-decylamine, tetradecylamine and octadecylamine, has good reactivity, and the moderate fatty chain has good compatibility with the PE matrix.

[0014] Step A3: premix ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide, add alkylated fiber and mix, pressurize the reaction system to 5-8 bar with compressed air, heat to 85-95° C. and react for 4-5 hours, and remove dimethyl sulfoxide by vacuum rotary evaporation after the reaction to obtain antibacterial modified cellulose;

[0015] Furthermore, the feed ratio of the alkylated fiber, ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide is 50 g: 10-15 mmol: 0.1-0.12 g: 120-160 mL, and the ethyl iodide reacts with the amine-aldehyde condensation site in the alkylated fiber to undergo quaternization reaction.

[0016] Preferably, the lubricant is a mixture of polyethylene wax and stearic acid, which has good internal and external lubrication and is compatible with injection molding and molding requirements.

[0017] A method for preparing an antibacterial PE composite board comprises the following steps:

[0018] Step S1: mixing HDPE resin, LLDPE resin, lubricant and antioxidant, melt-extruding the mixture and adding antibacterial modified cellulose, drawing into strips, cooling and pelletizing to obtain composite masterbatch;

[0019] Step S2: plasticize and extrude the composite masterbatch into a plate mold, control the mold temperature to 70±5°C, and the mold pressure to 20±2MPa, and obtain an antibacterial PE composite plate by compression molding.

[0020] Beneficial effects of the present invention:

[0021] The invention is based on a fiber-reinforced polyethylene composite system, and discloses a composite of antibacterial modified cellulose and polyethylene resin, which gives the composite material good mechanical properties and excellent antibacterial properties; the antibacterial modified cellulose uses microfibrillated cellulose as a matrix, forms aldehyde groups on cellulose molecules through sodium periodate oxidation, and obtains aldehyded fibers, and then introduces alkyl fatty chains to the side chains of cellulose macromolecules for amine-aldehyde condensation by fatty chain monoamine and the introduced aldehyde groups, and obtains alkylated fibers, and finally, iodoethane is used for quaternization. Compared with the existing composite antibacterial polyethylene materials with externally added antibacterial agents, the alkyl fatty chains of the side chains of the antibacterial modified cellulose have high compatibility with the polyethylene matrix, so that the interface bonding performance of cellulose and the polyethylene matrix is ​​stronger, and it is not easy to generate microscopic cracks guided by cellulose under the action of external force deformation, reducing the adhesion and erosion of fungi, and in addition, the quaternary ammonium structure on the surface of cellulose and the fully quaternized Schiff base structure have extensive antibacterial properties, slowing down the reproduction of fungi in microscopic cracks, avoiding the erosion of cracks by reproduction metabolites, and maintaining stable mechanical properties of the plate. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1, preparation of antibacterial PE composite board, specifically as follows:

[0024] 1. Preparation of antibacterial modified cellulose

[0025] Step A1: Mix cellulose fibers and water and disperse them ultrasonically to prepare a suspension with a solid content of 8 wt%. Heat the suspension and control the temperature of the suspension in a water bath to 50°C. Stir at 240 rpm and prepare a sodium periodate solution with a concentration of 0.1 mol / L. Slowly add the sodium periodate solution to the reaction system in a light-proof environment for 3.5 hours. The cellulose fibers are all microfibrillated cellulose from Guilin Qihongke Co., Ltd. The feed ratio of cellulose fibers to sodium periodate is 50 g:1.9 g. After the reaction is completed, filter with a filter membrane, wash and filter repeatedly until the washing liquid is neutral to prepare aldehyded fibers.

[0026] Step A2: pre-mix aliphatic chain monoamine, triethylamine and chloroform, add hydroxylated fiber and stir at high speed, introduce nitrogen protection, heat to 45°C, stir at 60 rpm and react for 12 hours, wherein the aliphatic chain monoamine is n-decylamine, and the feed ratio of hydroxylated fiber, aliphatic chain monoamine, triethylamine and chloroform is 50 g:18 mmol:5 mL:150 mL. After the reaction is completed, filter with a filter membrane and wash with ethanol to obtain alkylated fiber.

[0027] Step A3: pre-mix ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide, add alkylated fiber and stir at high speed, pressurize the reaction system to 5 bar with compressed air, heat to 85°C and react for 4 hours, wherein the feed ratio of alkylated fiber, ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide is 50 g:10 mmol:0.1 g:120 mL, and remove dimethyl sulfoxide by vacuum rotary evaporation after the reaction to obtain antibacterial modified cellulose.

[0028] 2. Preparation of PE composite board

[0029] Ingredients: The raw materials are taken by weight, 100 parts of HDPE (high-density polyethylene) resin, using 2200J type resin raw material from Daqing Petrochemical Company; 18 parts of LLDPE (linear low-density polyethylene) resin, using DNDA-7144 type resin raw material from Maoming Petrochemical; 7.5 parts of antibacterial modified cellulose, which is self-made in this embodiment; 1.7 parts of lubricant, using H105 type polyethylene wax and industrial grade stearic acid 1840 from Qingdao Haihao New Materials Co., Ltd. in a weight ratio of 2:1; 0.15 parts of antioxidant, using antioxidant 1076 and antioxidant 168 in an equal weight ratio.

[0030] Step S1: HDPE resin, LLDPE resin, lubricant and antioxidant are mixed in a high-speed mixer, the mixture is melt-extruded at 180° C., antibacterial modified cellulose is added from a side feed port, and after extrusion, the mixture is stretched into strips, cooled and pelletized to obtain a composite masterbatch.

[0031] Step S2: plasticize and extrude the composite masterbatch, the temperature of the plasticizing compression zone is 225°C, the plasticized material is extruded into the plate mold, the mold temperature is controlled to be 70±5°C, the molding pressure is 20±2MPa, and the composite masterbatch is compression molded to obtain an antibacterial PE composite board.

[0032] Example 2, preparing an antibacterial PE composite board, specifically as follows:

[0033] 1. Preparation of antibacterial modified cellulose

[0034] Step A1: Mix cellulose fibers and water and disperse them ultrasonically to prepare a suspension with a solid content of 6.5 wt%. Heat the suspension and control the temperature of the suspension in a water bath to 40°C. Stir at 180 rpm and prepare a sodium periodate solution with a concentration of 0.08 mol / L. Slowly add the sodium periodate solution to the reaction system in a light-proof environment to react for 4.5 hours. The cellulose fibers are all microfibrillated cellulose from Guilin Qihongke Co., Ltd. The feed ratio of cellulose fibers to sodium periodate is 50 g:1.4 g. After the reaction is completed, filter with a filter membrane, wash and filter repeatedly until the washing liquid is neutral to prepare aldehyded fibers.

[0035] Step A2: pre-mix a fatty chain monoamine, triethylamine and chloroform, add the hydroxylated fiber and stir at high speed, introduce nitrogen protection, heat to 70°C, and stir at 90 rpm for 18 hours, wherein the fatty chain monoamine is octadecylamine, and the feed ratio of the hydroxylated fiber, the fatty chain monoamine, triethylamine and chloroform is 50 g: 26 mmol: 10 mL: 230 mL. After the reaction is completed, filter with a filter membrane and wash with ethanol to obtain the alkylated fiber.

[0036] Step A3: pre-mix ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide, add alkylated fiber and stir at high speed, pressurize the reaction system to 8 bar with compressed air, raise the temperature to 95°C and react for 5 hours, wherein the feed ratio of alkylated fiber, ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide is 50 g:15 mmol:0.12 g:160 mL, and remove dimethyl sulfoxide by vacuum rotary evaporation after the reaction to obtain antibacterial modified cellulose.

[0037] 2. Preparation of PE composite board

[0038] Ingredients: The raw materials are taken by weight, 100 parts of HDPE resin, using 2200J type resin raw material from Daqing Petrochemical Company; 14 parts of LLDPE resin, using DNDA-7144 type resin raw material from Maoming Petrochemical; 11 parts of antibacterial modified cellulose, which is homemade in this embodiment; 2.2 parts of lubricant, using H105 type polyethylene wax and industrial grade stearic acid 1840 from Qingdao Haihao New Materials Co., Ltd. in a weight ratio of 2: 1; 0.2 parts of antioxidant, using antioxidant 1076 and antioxidant 168 in an equal weight ratio.

[0039] Step S1: HDPE resin, LLDPE resin, lubricant and antioxidant are mixed in a high-speed mixer, the mixture is melt-extruded at 190° C., antibacterial modified cellulose is added from a side feed port, and after extrusion, the mixture is stretched into strips, cooled and pelletized to obtain a composite masterbatch.

[0040] Step S2: plasticize and extrude the composite masterbatch, the temperature of the plasticizing compression zone is 235°C, the plasticized material is extruded into the plate mold, the mold temperature is controlled to be 70±5°C, the molding pressure is 20±2MPa, and the composite masterbatch is molded to obtain an antibacterial PE composite board.

[0041] Example 3, preparation of antibacterial PE composite board, specifically as follows:

[0042] 1. Preparation of antibacterial modified cellulose

[0043] Step A1: Mix cellulose fibers and water and disperse them ultrasonically to prepare a suspension with a solid content of 7 wt%. Heat the suspension and control the temperature of the suspension in a water bath to 45°C. Stir at 240 rpm and prepare a sodium periodate solution with a concentration of 0.08 mol / L. Slowly add the sodium periodate solution to the reaction system in a light-proof environment for 4 hours. The cellulose fibers are all microfibrillated cellulose from Guilin Qihongke Co., Ltd. The feed ratio of cellulose fibers to sodium periodate is 50 g:1.6 g. After the reaction is completed, filter with a filter membrane, wash and filter repeatedly until the washing liquid is neutral to prepare aldehyded fibers.

[0044] Step A2: pre-mix a fatty chain monoamine, triethylamine and chloroform, add the hydroxylated fiber and stir at high speed, introduce nitrogen protection, heat to 55°C, and stir at 90 rpm for 15 hours, wherein the fatty chain monoamine is tetradecylamine, and the feed ratio of the hydroxylated fiber, fatty chain monoamine, triethylamine and chloroform is 50g:22mmol:7mL:190mL. After the reaction is completed, filter with a filter membrane and wash with ethanol to obtain the alkylated fiber.

[0045] Step A3: Take iodine ethane, hexadecyltrimethylammonium bromide and dimethyl sulfoxide as feed materials and premix them, then add alkylated fiber and stir and mix at high speed, use compressed air to pressurize the reaction system to 7 bar, raise the temperature to 90°C and react for 4.5 hours, wherein the feed ratio of alkylated fiber, iodine ethane, hexadecyltrimethylammonium bromide and dimethyl sulfoxide is 50g:12mmol:0.1g:150mL, and after the reaction, remove dimethyl sulfoxide by vacuum rotary evaporation to obtain antibacterial modified cellulose.

[0046] 2. Preparation of PE composite board

[0047] Ingredients: The raw materials are taken by weight, 100 parts of HDPE resin, using 2200J type resin raw material from Daqing Petrochemical Company; 16 parts of LLDPE resin, using DNDA-7144 type resin raw material from Maoming Petrochemical; 9 parts of antibacterial modified cellulose, which is homemade in this embodiment; 2 parts of lubricant, using H105 type polyethylene wax and industrial grade stearic acid 1840 from Qingdao Haihao New Materials Co., Ltd. in a weight ratio of 2: 1; 0.18 parts of antioxidant, using antioxidant 1076 and antioxidant 168 in an equal weight ratio.

[0048] Step S1: HDPE resin, LLDPE resin, lubricant and antioxidant are mixed in a high-speed mixer, the mixture is melt-extruded at 190° C., antibacterial modified cellulose is added from a side feed port, and after extrusion, the mixture is stretched into strips, cooled and pelletized to obtain a composite masterbatch.

[0049] Step S2: plasticize and extrude the composite masterbatch, the temperature of the plasticizing compression zone is 230°C, the plasticized material is extruded into the plate mold, the mold temperature is controlled to be 70±5°C, the molding pressure is 20±2MPa, and the composite masterbatch is compression molded to obtain an antibacterial PE composite board.

[0050] Example 4, preparation of antibacterial PE composite board, specifically as follows:

[0051] 1. Preparation of antibacterial modified cellulose

[0052] Step A1: Mix cellulose fibers and water and disperse them ultrasonically to prepare a suspension with a solid content of 7 wt%. Heat the suspension and control the temperature of the suspension in a water bath to 50°C. Stir at 240 rpm and prepare a sodium periodate solution with a concentration of 0.1 mol / L. Slowly add the sodium periodate solution to the reaction system in a light-proof environment to react for 4.2 hours. The cellulose fibers are all microfibrillated cellulose from Guilin Qihongke Co., Ltd. The feed ratio of cellulose fibers to sodium periodate is 50 g:1.5 g. After the reaction is completed, filter with a filter membrane, wash and filter repeatedly until the washing liquid is neutral to prepare aldehyded fibers.

[0053] Step A2: pre-mix a fatty chain monoamine, triethylamine and chloroform, add the aldehyded fiber and stir at high speed, introduce nitrogen protection, heat to 60°C, and stir at 90 rpm for 15 hours, wherein the fatty chain monoamines are n-decylamine, tetradecylamine and octadecylamine, and the feed ratio of the aldehyded fiber, fatty chain monoamine, triethylamine and chloroform is 50 g:20 mmol:8 mL:180 mL. After the reaction is completed, filter with a filter membrane and wash with ethanol to obtain the alkylated fiber.

[0054] Step A3: pre-mix ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide, add alkylated fiber and stir at high speed, pressurize the reaction system to 7 bar with compressed air, heat to 90°C and react for 5 hours, wherein the feed ratio of alkylated fiber, ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide is 50 g:12 mmol:0.12 g:150 mL, and remove dimethyl sulfoxide by vacuum rotary evaporation after the reaction to obtain antibacterial modified cellulose.

[0055] 2. Preparation of PE composite board

[0056] Ingredients: The raw materials are taken by weight, 100 parts of HDPE resin, using 2200J type resin raw material from Daqing Petrochemical Company; 15 parts of LLDPE resin, using DNDA-7144 type resin raw material from Maoming Petrochemical; 9.5 parts of antibacterial modified cellulose, which is self-made in this embodiment; 1.9 parts of lubricant, using H105 type polyethylene wax and industrial grade stearic acid 1840 from Qingdao Haihao New Materials Co., Ltd. in a weight ratio of 2: 1; 0.18 parts of antioxidant, using antioxidant 1076 and antioxidant 168 in an equal weight ratio.

[0057] Step S1: HDPE resin, LLDPE resin, lubricant and antioxidant are mixed in a high-speed mixer, the mixture is melt-extruded at 180° C., antibacterial modified cellulose is added from a side feed port, and after extrusion, the mixture is stretched into strips, cooled and pelletized to obtain a composite masterbatch.

[0058] Step S2: plasticize and extrude the composite masterbatch, the temperature of the plasticizing compression zone is 230°C, the plasticized material is extruded into the plate mold, the mold temperature is controlled to be 70±5°C, the molding pressure is 20±2MPa, and the composite masterbatch is compression molded to obtain an antibacterial PE composite board.

[0059] Comparative Example 1, referring to Example 4, the antibacterial modified cellulose was replaced by 8.5 parts of microfibrillated cellulose and 1 part of PT430 antibacterial and mildew-proof agent, and the rest of the implementation process was exactly the same.

[0060] Comparative Example 2, preparing an antibacterial PE composite board, specifically as follows:

[0061] Preparation of coupled cellulose: Referring to the prior art, hexadecyltrimethoxysilane and a 50% by volume ethanol aqueous solution were mixed, the pH value was adjusted to 4 with hydrochloric acid, stirred and hydrolyzed for 1 hour, and then the hydrolyzate was mixed with a microfibrillated cellulose suspension with a solid content of 7.5wt%, allowed to stand for 24 hours, filtered and washed with water to obtain coupled cellulose;

[0062] Preparation of PE composite board: Referring to Comparative Example 1, the microfibrillated cellulose was replaced by coupled cellulose, and the rest of the implementation process was exactly the same.

[0063] Samples were taken from the PE composite board prepared as above, and tensile tests were performed according to GB / T 1040.2-2022 standard, with a tensile rate of 100 mm / min; antibacterial tests were performed according to GB / T 30706-2014 standard, and the test bacteria were Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The specific test results are shown in Table 1:

[0064] Table 1

[0065]

[0066] It can be seen from the test results in Table 1 that the PE composite board prepared in the embodiment has good mechanical properties and excellent antibacterial properties.

[0067] Samples were taken from the PE composite board as above to simulate the microscopic cracks caused by deformation during actual use. The samples were then buried in the same batch of humus soil for 6 months to simulate the erosion of the board by natural fungi, simulating the actual complex fungi erosion of the board. The samples were then taken out for cleaning and tensile tests were performed again to calculate the change rate of tensile strength and elongation. The specific test results are shown in Table 2:

[0068] Table 2

[0069]

[0070] It can be seen from the test results in Table 2 that after simulated erosion, the change rates of tensile strength and elongation of the PE composite plate prepared in the embodiment are significantly lower than those in the comparative example, showing excellent stability.

[0071] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. An antibacterial PE composite board, characterized in that: The composition comprises, by weight: 100 parts of HDPE resin, 14-18 parts of LLDPE resin, 7.5-11 parts of antibacterial modified cellulose, 1.7-2.2 parts of lubricant and 0.15-0.2 parts of antioxidant; The antibacterial modified cellulose is prepared by the following method: Step A1: cellulose fiber and water are mixed to form a suspension, the water bath temperature is controlled at 40-50°C, and sodium periodate solution is slowly added under stirring and light-proof environment to react for 3.5-4.5 hours. After the reaction is completed, the fiber is filtered and washed with water to obtain hydroformylation fiber; Step A2: premix aliphatic monoamine, triethylamine and chloroform, add aldehyded fiber and mix, introduce nitrogen protection, heat to 45-70°C, stir and react for 12-18h, filter after reaction and wash with ethanol to obtain alkylated fiber; Step A3: premix iodine ethane, hexadecyltrimethylammonium bromide and dimethyl sulfoxide, add alkylated fiber and mix, pressurize the reaction system to 5-8 bar with compressed air, heat to 85-95° C. and react for 4-5 hours. After the reaction is completed, remove dimethyl sulfoxide by vacuum rotary evaporation to obtain antibacterial modified cellulose.

2. The antibacterial PE composite board according to claim 1, characterized in that: The feed ratio of cellulose fiber to sodium periodate is 50g:1.4-1.9g, the solid content of the suspension is 6.5-8wt%, and the concentration of the sodium periodate solution is 0.08-0.1mol / L.

3. The antibacterial PE composite board according to claim 2, characterized in that: The cellulose fibers are selected from microfibrillated cellulose.

4. The antibacterial PE composite board according to claim 2, characterized in that: The feed ratio of hydroformylation fiber, fatty chain monoamine, triethylamine and chloroform is 50g:18-26mmol:5-10mL:150-230mL.

5. The antibacterial PE composite board according to claim 4, characterized in that: The fatty chain monoamine is one of n-decylamine, tetradecylamine and octadecylamine.

6. The antibacterial PE composite board according to claim 4, characterized in that: The feed ratio of alkylated fiber, ethyl iodide, hexadecyltrimethylammonium bromide and dimethyl sulfoxide is 50 g: 10-15 mmol: 0.1-0.12 g: 120-160 mL.

7. A method for preparing the antibacterial PE composite board according to any one of claims 1 to 6, characterized in that: The steps include: Step S1: mixing HDPE resin, LLDPE resin, lubricant and antioxidant, melt-extruding the mixture and adding antibacterial modified cellulose, drawing into strips, cooling and pelletizing to obtain composite masterbatch; Step S2: plasticize and extrude the composite masterbatch into a plate mold, control the mold temperature to 70±5°C, and the mold pressure to 20±2MPa, and obtain an antibacterial PE composite plate by compression molding.

8. The method for preparing an antibacterial PE composite board according to claim 7, characterized in that: The lubricant is a mixture of polyethylene wax and stearic acid.

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