Composite antibacterial fresh-keeping packaging paper as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of preservative paper preparation, and particularly relates to composite antibacterial preservative packaging paper as well as a preparation method and application thereof. The preparation method of the composite antibacterial fresh-keeping packaging paper comprises the following steps: firstly, mixing and pulping bleached bamboo pulp and broadleaf wood chemithermomechanical pulp, adding aluminum sulfate, rosin size, a wet strength agent PAE and sodium hexametaphosphate, and performing papermaking and forming; then, essential oil is added into starch gelatinization liquid composed of oxidized corn starch and an epsilon-polylysine hydrochloride solution, a fresh-keeping coating emulsion is obtained through emulsification, and finally, the composite antibacterial fresh-keeping packaging paper is obtained through coating and drying. According to the composite antibacterial fresh-keeping packaging paper disclosed by the invention, fresh-keeping coated paper is prepared by adopting the natural antibacterial agent, the bamboo pulp fiber and other raw materials and matching with the oxidized corn starch through a specific process, and the composite antibacterial fresh-keeping packaging paper has the characteristics of bacteriostasis, environmental friendliness and stability and safety in use, can be used as fresh-keeping packaging paper or fresh-keeping packing paper, effectively delays the decay of various fruits, and is suitable for being used in multiple scenes; the invention also provides a preparation method thereof.

Description

Technical Field

[0001] This invention belongs to the field of food preservation paper preparation technology, specifically relating to a composite antibacterial food preservation packaging paper, its preparation method, and its application. Background Technology

[0002] Fruits, rich in vitamins, dietary fiber, and trace elements, are an indispensable part of people's daily lives. They are typically packaged in corrugated cardboard boxes, mesh bags, woven bags, or non-degradable petroleum-based films. However, these products mostly provide only physical protection and cannot effectively prevent microbial contamination caused by fungi such as Aspergillus, Penicillium, Mucor, and Botrytis during harvesting, storage, and transportation. These fungi not only multiply rapidly under suitable temperature and humidity conditions but also produce mycotoxins. Generally, the higher the relative humidity of the environment, the more active these harmful bacteria become.

[0003] Traditional preservation methods rely heavily on chemically synthesized preservatives (such as sulfur dioxide and benzoates) or physical temperature control techniques. While these methods are effective to some extent, they also have drawbacks such as chemical residue toxicity, environmental pollution, and high energy consumption. Currently, research on replacing chemical preservatives with natural antibacterial agents has made progress, but their practical application still faces bottlenecks. For example, single antibacterial agents are less effective and struggle to combat the complex microbial communities on fruit surfaces; volatile components (such as essential oils) are easily decomposed and inactivated in packaging materials, making long-term sustained release difficult. Summary of the Invention

[0004] To overcome the aforementioned deficiencies in the existing technology, this invention provides a composite antibacterial preservation packaging paper, which uses natural antibacterial agents and bamboo pulp fiber as raw materials, combined with oxidized corn starch and a specific process to make a preservation coating paper. It has the characteristics of antibacterial properties, environmental friendliness, and stable and safe use. It can be used as preservation packaging paper or preservation mat paper, effectively delaying the spoilage of various fruits and is suitable for use in multiple scenarios. This invention also provides its preparation method.

[0005] This invention is achieved through the following technical solution: A method for preparing a composite antibacterial and food-preserving packaging paper includes the following steps: (1) Pulping: Mix bleached bamboo pulp and hardwood molten pulp evenly, and use a PFI mill to pulp to 25-40°SR. Then, add water to adjust the pulp and mix evenly. (2) Papermaking: In step (1), aluminum sulfate, rosin gum, wet strength agent PAE and sodium hexametaphosphate are added to the pulp and diluted with water. Finally, the paper is formed by papermaking using a paper forming machine and dried to obtain the base paper. The total mass of bleached bamboo pulp and hardwood chemimechanical pulp is used as the calculation basis. The addition amounts of aluminum sulfate, rosin gum, wet strength agent PAE and sodium hexametaphosphate are 10-20 kg / ton of paper, 10-20 kg / ton of paper, 5-10 kg / ton of paper and 0.5-1 kg / ton of paper, respectively. (3) Preparation of the preservative coating emulsion: a. Add ε-polylysine hydrochloride to water and stir until homogeneous to obtain an ε-polylysine hydrochloride solution; b. Preparation of starch gelatinization solution: Oxidized corn starch is added to ε-polylysine hydrochloride solution and stirred at 85-95℃ for 20-30 min; c. Add essential oil to starch gelatinized liquid, place in a high-speed homogenizing emulsifier, and emulsify to obtain a preservative coating emulsion; d. Apply the preservative coating emulsion onto the base paper and dry to obtain composite antibacterial preservative packaging paper.

[0006] The mass ratio of the bleached bamboo pulp to the hardwood chemimechanical pulp is (1.5-4):1.

[0007] The sheet forming machine has a sheet-forming capacity of 43-46 g / m³. 2 The drying temperature is 95-105℃, the pressure is 0.06-0.1kPa, and the time is 3-5min.

[0008] The concentration of the ε-polylysine hydrochloride solution is 0.5-0.8 wt.%.

[0009] In the starch gelatinization solution, the concentration of oxidized corn starch is 5-7 wt.%, and the concentration of oxidized corn starch is based on its oven-dry weight. The oven-dry weight of oxidized corn starch refers to the mass of the remaining solid matter after removing all the water from the oxidized corn starch, which represents the effective weight of the oxidized corn starch itself.

[0010] The essential oil is one or more of the following: cinnamon oil, tea tree oil, pine oil, oregano oil, lemongrass oil, eucalyptus oil, garlic oil, and mustard oil.

[0011] In step (3), the amount of essential oil added is 20-40% of the mass of oxidized corn starch, and the mass of oxidized corn starch is based on its oven-dry weight.

[0012] In step (3), the high-speed homogenizing emulsifier has a rotation speed of 8000-12000 r / min and an emulsification time of 3-5 min.

[0013] In the composite antibacterial and food-preserving packaging paper, the coating amount of the food-preserving emulsion is 3-5 g / m².2 The drying temperature is 100-110℃.

[0014] The composite antibacterial and food-preserving packaging paper of the present invention is prepared by the above-described preparation method.

[0015] The composite antibacterial and food-preserving packaging paper can be used as fruit packaging paper or as a food preservation pad.

[0016] In terms of substrate selection, this invention uses bamboo pulp fiber as the paper base, which has the characteristics of high specific surface area, high hydroxyl content, high strength and toughness, and low impurities and high purity, providing a stable adhesion carrier for the subsequent coating layer and improving the overall stability of the preservation paper. Secondly, using oxidized corn starch as the base film-forming material, the carboxyl and carbonyl groups introduced after oxidation treatment enhance hydrophilicity while retaining the hydrophobic region of amylose. This structural feature allows it to form a stable oil-in-water emulsion with hydrophobic plant essential oils, providing a basis for the uniform dispersion of antibacterial components. ε-polylysine hydrochloride, as a cationic polypeptide, binds to amylose through hydrogen bonds or electrostatic interactions during starch gelatinization, promoting full gelatinization of starch particles, effectively inhibiting starch molecule recrystallization, and significantly improving the storage and use stability of the coating emulsion. On the other hand, ε-polylysine hydrochloride itself possesses broad-spectrum antibacterial activity. It can disrupt the integrity of bacterial cell membranes through electrostatic adsorption, leading to leakage of intracellular substances and achieving the killing or inhibition of bacteria, fungi, and even viruses. Moreover, this antibacterial activity remains stable at high temperatures of 121℃ and within a wide acid-base range of pH=2-9, ensuring effectiveness in different scenarios. Finally, sodium hexametaphosphate, introduced at the base paper stage, acts as a dispersant and stabilizer, promoting good dispersion of bamboo pulp fibers, improving pulp uniformity and softness, and enhancing paper toughness. Its polyanionic phosphate structure can form strong electrostatic coordination with the amino groups of ε-polylysine hydrochloride, inhibiting the thermal decomposition of antibacterial agents at high drying temperatures. Furthermore, sodium hexametaphosphate can cross-link with starch molecules through hydrogen bonds and complexation, filling tiny gaps in the coating and forming a dense coating film. This reduces the volatilization and loss of plant essential oils and antibacterial molecules such as ε-polylysine hydrochloride, extending shelf life.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The composite antibacterial and fresh-keeping packaging paper of the present invention uses bamboo pulp fiber, essential oil and microbial antibacterial agent ε-polylysine hydrochloride, which are all natural materials that are easily decomposed by the environment. At the same time, bamboo pulp fiber has the advantages of high specific surface area, high hydroxyl content, high strength and toughness, low impurity purity and natural safety, which are conducive to improving the stability of product use and reducing safety risks.

[0018] (2) The composite antibacterial fresh-keeping packaging paper of the present invention improves the stability of the coating liquid through the interaction between ε-polylysine hydrochloride and starch, and optimizes the fiber dispersion and coating density by sodium hexametaphosphate. This not only enhances the physical properties of the paper such as toughness and uniformity, but also achieves thermal stability protection and volatilization control of antibacterial components, ensuring the stability of the fresh-keeping paper during storage, transportation and use.

[0019] (3) The preparation method of the composite antibacterial preservation packaging paper of the present invention is simple. The prepared product can be used as preservation packaging paper or preservation pad paper, which is suitable for different usage scenarios and the preservation of various fruits. It can effectively delay the spoilage rate of various fruits. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments and comparative examples. Unless otherwise specified, the raw materials used in the embodiments and comparative examples are all conventional commercial raw materials, and the process methods used are all conventional methods in the art unless otherwise specified. The percentages of raw materials involved in the embodiments and comparative examples are all mass percentages.

[0021] The raw materials used in the examples and comparative examples are described below: Bleached bamboo pulp: Taisheng (Guizhou) Bamboo Resources Development Co., Ltd.; Hardwood chemical pulp: Shandong Renfeng Special Materials Co., Ltd.; Aluminum sulfate: Sanfeng Environmental Group Co., Ltd.; Rosin Gum: CEM-1735B cationic rosin gum produced by Hangzhou Hanghua Halima Chemical Co., Ltd. PAE (Potential Strength Agent): Weifang Tianfang Shenghong Chemical Co., Ltd. Sodium hexametaphosphate: Hubei Xingfa Chemical Group Co., Ltd.; Essential oils: Jiangxi Huanqiu Natural Fragrance Co., Ltd.; ε-Polylysine Hydrochloride: Shandong Yuantai Bioengineering Co., Ltd.; Oxidized corn starch: Zaozhuang Oriental Modified Starch Co., Ltd., moisture content ≤14wt.%.

[0022] The preparation method of the composite antibacterial and food-preserving packaging paper includes the following steps: (1) Pulping: Mix bleached bamboo pulp and hardwood chemimechanical pulp at a mass ratio of (1.5-4):1, and pulp to 25-40°SR using a PFI mill. Then, add water to adjust the pulp concentration to 3wt.% and mix evenly. (2) Papermaking: In step (1), aluminum sulfate, rosin gum, wet strength agent PAE and sodium hexametaphosphate are added to the pulp at amounts of 10-20 kg / ton of paper, 10-20 kg / ton of paper, 5-10 kg / ton of paper and 0.5-1 kg / ton of paper, respectively. The pulp is diluted with water to a concentration of 1.0 wt.%. Finally, the paper is formed using a sheet forming machine, and the sheet forming weight is 43-46 g / m³. 2 The paper is dried at a temperature of 100±5℃ and a pressure of 0.08±0.02kPa for 3-5 minutes to obtain the base paper. (3) Preparation of the preservative coating emulsion: a. Add ε-polylysine hydrochloride to water and stir until homogeneous to obtain an ε-polylysine hydrochloride solution with a concentration of 0.5-0.8 wt.%. b. Preparation of starch gelatinization solution: Oxidized corn starch was added to an ε-polylysine hydrochloride solution and stirred at 85-95℃ for 20-30 min. The concentration of oxidized corn starch in the starch gelatinization solution was 5-7 wt.%. c. Add 20-40% of the essential oil by weight of oven-dried oxidized corn starch to the starch gelatinization liquid, place it in a high-speed homogenizing emulsifier, rotate at 8000-12000 r / min, emulsify for 3-5 min, and obtain a fresh-keeping coating emulsion. d. Apply the preservative coating emulsion onto the base paper at a coating amount of 3-5 g / m². 2 Dry at 100-110℃ to obtain composite antibacterial and fresh-keeping packaging paper.

[0023] Example 1 The preparation method of the composite antibacterial and food-preserving packaging paper includes the following steps: (1) Pulping: Mix bleached bamboo pulp and hardwood chemimechanical pulp at a mass ratio of 1.5:1, and pulp to 25°SR using a PFI mill. Then, add water to adjust the pulp concentration to 3wt.% and mix evenly. (2) Papermaking: In step (1), add 10 kg / ton of aluminum sulfate, 10 kg / ton of rosin, 5 kg / ton of wet strength agent PAE and 0.5 kg / ton of sodium hexametaphosphate to the pulp, and dilute with water to a pulp concentration of 1.0 wt.%. Finally, form the paper using a paper forming machine, and the papermaking standard is 43 g / m. 2 The paper was dried for 3 minutes at a temperature of 100±5℃ and a pressure of 0.08±0.02kPa to obtain the base paper. (3) Preparation of the preservative coating emulsion: a. Take 0.8g of ε-polylysine hydrochloride and add it to 100ml of distilled water. Stir well to obtain an ε-polylysine hydrochloride solution. b. Preparation of starch gelatinization solution: Take 7g of oxidized corn starch (dry weight) and add it to ε-polylysine hydrochloride solution, and stir at 85℃ for 30min; c. Mix cinnamon oil, lemongrass oil, and oregano oil in a volume ratio of 2:1:1. Add 1.4g of essential oil to the starch gelatinization liquid and place it in a high-speed homogenizing emulsifier at a speed of 8000r / min for 3min to obtain a freshness-preserving coating emulsion. d. Apply the preservative coating emulsion onto the base paper at a coating weight of 3 g / m². 2 Dry at 100℃ to obtain composite antibacterial and food-preserving packaging paper.

[0024] Example 2 The preparation method of the composite antibacterial and food-preserving packaging paper includes the following steps: (1) Pulping: Mix bleached bamboo pulp and hardwood chemimechanical pulp at a mass ratio of 7:3, and pulp to 30°SR using a PFI mill. Then, add water to adjust the pulp concentration to 3wt.% and mix evenly. (2) Papermaking: In step (1), add 15 kg / ton of aluminum sulfate, 15 kg / ton of rosin, 10 kg / ton of wet strength agent PAE and 1 kg / ton of sodium hexametaphosphate to the pulp, and dilute with water to a pulp concentration of 1.0 wt.%. Finally, form the paper using a paper forming machine, and the papermaking weight is 44 g / m. 2 The paper was dried at a temperature of 100±5℃ and a pressure of 0.08±0.02kPa for 4 minutes to obtain the base paper. (3) Preparation of the preservative coating emulsion: a. Take 0.5g of ε-polylysine hydrochloride and add it to 100ml of distilled water. Stir well to obtain an ε-polylysine hydrochloride solution. b. Preparation of starch gelatinization solution: Take 5g of oxidized corn starch (octaneous dry weight) and add it to ε-polylysine hydrochloride solution, and stir at 95℃ for 25min; c. Mix cinnamon oil, pine oil, and eucalyptus oil in a volume ratio of 2:1:1. Add 1.6g of the oil to the starch gelatinization liquid and place it in a high-speed homogenizing emulsifier at a speed of 10000r / min for 5min to obtain a freshness-preserving coating emulsion. d. Apply the preservative coating emulsion onto the base paper at a coating weight of 5 g / m². 2 Dry at 105℃ to obtain composite antibacterial and food-preserving packaging paper.

[0025] Example 3 The preparation method of the composite antibacterial and food-preserving packaging paper includes the following steps: (1) Pulping: Mix bleached bamboo pulp and hardwood chemimechanical pulp at a mass ratio of 4:1, and pulp to 40°SR using a PFI mill. Then, add water to adjust the pulp concentration to 3wt.% and mix evenly. (2) Papermaking: In step (1), add 20 kg / ton of aluminum sulfate, 20 kg / ton of rosin, 10 kg / ton of wet strength agent PAE and 1 kg / ton of sodium hexametaphosphate to the pulp, and dilute with water to a pulp concentration of 1.0 wt.%. Finally, form the paper using a paper forming machine, and the papermaking weight is 46 g / m. 2 The paper was dried for 5 minutes at a temperature of 100±5℃ and a pressure of 0.08±0.02kPa to obtain the base paper. (3) Preparation of the preservative coating emulsion: a. Take 0.5g of ε-polylysine hydrochloride and add it to 100ml of distilled water. Stir well to obtain an ε-polylysine hydrochloride solution. b. Preparation of starch gelatinization solution: Take 5g of oxidized corn starch (dry weight) and add it to ε-polylysine hydrochloride solution, and stir at 90℃ for 30min; c. Mix tea tree oil, pine oil, and lemongrass essential oil in a volume ratio of 1:2:1. Add 1.6g of essential oil to the starch gelatinization liquid and place it in a high-speed homogenizing emulsifier at a speed of 12000r / min for 4min to obtain a freshness-preserving coating emulsion. d. Apply the preservative coating emulsion onto the base paper at a coating weight of 4 g / m². 2 Dry at 110℃ to obtain composite antibacterial and food-preserving packaging paper.

[0026] Example 4 The preparation method of the composite antibacterial and food-preserving packaging paper includes the following steps: (1) Pulping: Mix bleached bamboo pulp and hardwood chemimetall pulp evenly at a mass ratio of 7:3, and pulp to 35°SR using a PFI mill. Then, add water to adjust the pulp concentration to 3wt.% and mix evenly. (2) Papermaking: In step (1), add 15 kg / ton of aluminum sulfate, 15 kg / ton of rosin, 8 kg / ton of wet strength agent PAE and 0.8 kg / ton of sodium hexametaphosphate to the pulp, and dilute with water to a pulp concentration of 1.0 wt.%. Finally, form the paper using a paper forming machine, and the papermaking standard is 46 g / m³. 2 The paper was dried for 5 minutes at a temperature of 100±5℃ and a pressure of 0.08±0.02kPa to obtain the base paper. (3) Preparation of the preservative coating emulsion: a. Take 0.7g of ε-polylysine hydrochloride and add it to 100ml of distilled water. Stir well to obtain an ε-polylysine hydrochloride solution. b. Preparation of starch gelatinization solution: Take 6g of oxidized corn starch (dry weight) and add it to ε-polylysine hydrochloride solution, and stir at 95℃ for 25min; c. Mix cinnamon oil, pine oil, and eucalyptus oil in a volume ratio of 2:1:1. Add 1.8g of the oil to the starch gelatinization liquid and place it in a high-speed homogenizing emulsifier at a speed of 12000r / min for 4min to obtain a freshness-preserving coating emulsion. d. Apply the preservative coating emulsion onto the base paper at a coating weight of 3.7 g / m². 2 Dry at 110℃ to obtain composite antibacterial and food-preserving packaging paper.

[0027] Comparative Example 1 This comparative example is the same as Example 2, except that the oxidized corn starch is gelatinized in water and ε-polylysine hydrochloride is not added. The remaining steps and amounts are the same as in Example 2.

[0028] Comparative Example 2 This comparative example is the same as Example 2, except that sodium hexametaphosphate is not added in the paper preparation stage, while the remaining steps and dosages are the same as in Example 2.

[0029] The tensile index of the products prepared in Examples 1-4 and Comparative Examples 1-2 was tested according to standard GB / T12914-2018, and the test results are shown in Table 1. The application performance of the products prepared in Example 2, Comparative Example 1, and Comparative Example 2 was evaluated. The application performance evaluation experiments were conducted simultaneously, and all products were stored in a constant temperature and humidity chamber at 25±1℃ and 65±5% relative humidity, without direct light, ensuring consistent external environmental conditions. The time to mold growth was recorded when visible mold spots with a diameter ≥1mm appeared on the fruit surface. Three parallel samples were set up for each experiment, and the data were the average of the three parallel experiments. The evaluation results are shown in Table 2. The blank group consisted of fruit placed directly in a BOPS transparent box.

[0030] Table 1. Product Tensile Index Test Table

[0031] Table 2 Product Application Performance Evaluation Table

[0032] As can be seen from Tables 1 and 2, compared with Comparative Example 1, Comparative Example 1 did not add ε-polylysine hydrochloride, and the emulsion formed by the oxidized corn starch gelatinized liquid and essential oil was not stable enough. The coating structure was easy to loose and had poor adhesion to bamboo pulp fiber. It could not improve the overall strength of the paper by means of the coating, resulting in a significant decrease in tensile index. At the same time, the antibacterial range and effect were also greatly reduced by relying solely on plant essential oil for antibacterial.

[0033] Comparing Comparative Example 2 and Example 2, sodium hexametaphosphate, as a dispersant, can promote the uniform dispersion of bamboo pulp fibers, improve pulp uniformity and softness, and enhance the structural integrity of the paper after forming. In Comparative Example 2, without the addition of sodium hexametaphosphate, the bamboo pulp fibers are prone to agglomeration, resulting in uneven fiber distribution inside the paper after papermaking, creating stress weak points and reducing tensile strength. At the same time, the lack of sodium hexametaphosphate leads to loose bonding between the coating and fibers, insufficient overall paper toughness, and a reduced tensile index. Furthermore, sodium hexametaphosphate can inhibit the thermal decomposition of ε-polylysine hydrochloride at high drying temperatures. Due to the lack of sodium hexametaphosphate, ε-polylysine hydrochloride undergoes thermal decomposition during drying, essential oils volatilize rapidly, the content of antibacterial components decreases, and the shelf life is shortened.

Claims

1. A method for preparing a composite antibacterial preservative wrapping paper, characterized by, It comprises the following steps: (1) beating: mixing bleached bamboo pulp and hardwood chemi-mechanical pulp uniformly, beating to 25-40°SR using PFI mill, then, adding water to pulp, mixing uniformly; (2) papermaking: adding aluminum sulfate, rosin size, wet strength agent PAE and sodium hexametaphosphate to the pulp of step (1), diluting with water, finally, using a paper sheet former to form and dry to obtain raw paper; (3) preparation of preservative coating emulsion: a. adding ε-polylysine hydrochloride into water, stirring uniformly to obtain ε-polylysine hydrochloride solution; b. preparation of starch gelatinization solution: adding oxidized corn starch into the ε-polylysine hydrochloride solution, stirring at 85-95℃ for 20-30min; c. adding essential oil into the starch gelatinization solution, emulsifying in a high-speed homogenizing emulsifier to obtain preservative coating emulsion; d. coating the preservative coating emulsion on the raw paper, drying to obtain composite antibacterial preservative packaging paper.

2. The method of claim 1, wherein the composite antibacterial preservative wrapping paper is prepared by coating a base paper with a solution of a silver salt and a chelating agent, and then drying the coated base paper. The mass ratio of bleached bamboo pulp to hardwood chemi-mechanical pulp is (1.5-4):

1.

3. The method of claim 1, wherein the composite antibacterial preservative paper is prepared by coating a paper with a solution of the antibacterial agent and the preservative agent. The addition amount of aluminum sulfate, rosin size, wet strength agent PAE and sodium hexametaphosphate is 10-20kg / ton of paper, 10-20kg / ton of paper, 5-10kg / ton of paper, 0.5-1kg / ton of paper, respectively, based on the total mass of bleached bamboo pulp and hardwood chemi-mechanical pulp as the calculation basis.

4. The method of claim 1, wherein the composite antibacterial preservative wrapping paper is prepared by coating a base paper with a solution of a silver salt and a chelating agent, and then drying the coated base paper. The paper former makes a paper sheet with a basis weight of 43 to 46 g / m 2 at a drying temperature of 95 to 105°C, a pressure of 0.06 to 0.1 kPa, and a time of 3 to 5 min.

5. The method of claim 1, wherein the composite antibacterial preservative wrapping paper is prepared by coating a base paper with a solution of a silver salt and a chelating agent, and then drying the coated base paper. In step (3), the concentration of ε-polylysine hydrochloride solution is 0.5-0.8wt.%; the concentration of oxidized corn starch in the starch gelatinization solution is 5-7wt.% based on the absolute dry mass; the addition amount of essential oil is 20-40% of the absolute dry mass of oxidized corn starch.

6. The method of claim 1, wherein the composite antibacterial preservative wrapping paper is prepared by coating a base paper with a solution of a silver salt and a chelating agent, and then drying the coated base paper. The essential oil is one or more of cinnamon essential oil, tea tree oil, pine oil, oregano essential oil, citronella essential oil, eucalyptus oil, garlic oil, mustard oil.

7. The method of claim 1, wherein the composite antibacterial preservative paper is prepared by coating a paper with a solution of the antibacterial agent and the preservative agent, and drying the paper. In step (3), the rotation speed of the high-speed homogenizing emulsifier is 8000-12000r / min, and the emulsification time is 3-5min.

8. The method of claim 1, wherein the composite antibacterial preservative wrapping paper is prepared by coating a base paper with a solution of a silver salt and a chelating agent, and then drying the coated base paper. The coating amount of the preservative coating emulsion in the step (3) is 3-5 g / m 2 , and the drying temperature is 100-110°C.

9. A composite antibacterial preservative packaging paper, characterized by, The composite antibacterial preservative packaging paper is prepared by the method of any one of claims 1-8.

10. Use of the composite antibacterial preservative wrapping paper according to claim 9, characterized in that, It can be used for fruit packaging paper or as a preservative pad paper.

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