CN115323823B - Preparation method and application of intelligent antibacterial coating emulsion for packaging paper - Google Patents

Preparation method and application of intelligent antibacterial coating emulsion for packaging paper Download PDF

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CN115323823B
CN115323823B CN202211131943.9A CN202211131943A CN115323823B CN 115323823 B CN115323823 B CN 115323823B CN 202211131943 A CN202211131943 A CN 202211131943A CN 115323823 B CN115323823 B CN 115323823B
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emulsion
packaging paper
cellulose
suspension
antibacterial
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CN115323823A (en
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吴敏
李鑫旺
邹东城
鲁鹏
宋雪萍
尹勇军
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Guangxi University
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Guangxi University
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention discloses a preparation method and application of an intelligent antibacterial coating emulsion for packaging paper, wherein amino functionalized methacrylate, a cross-linking agent 1, 6-hexanediol diacrylate, a photoinitiator 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone and an antibacterial agent cinnamaldehyde are mixed to be used as an oil phase, a suspension of oxidized cellulose nano-crystals (TOCNC) and a suspension of cellulose nano-filaments are mixed to be used as a water phase, and the intelligent antibacterial coating emulsion for the finished packaging paper is prepared by high-speed shearing and emulsification. The emulsion is uniformly coated on the surface of packaging paper by using an automatic coating machine, and then ultraviolet light is used for irradiating the emulsion to induce the amino-functionalized methacrylate in the oil phase to carry out interfacial photopolymerization reaction with a cross-linking agent so as to form a pH response intelligent antibacterial microcapsule layer on the surface of the packaging paper. The preparation method is simple, environment-friendly and low in toxicity, accords with the concept of sustainable development of green, has good pH stimulus response antibacterial property, can effectively protect food quality and prolongs shelf life.

Description

Preparation method and application of intelligent antibacterial coating emulsion for packaging paper
Technical Field
The invention relates to the technical field of emulsion, in particular to a preparation method and application of intelligent antibacterial coating emulsion for packaging paper.
Background
In the food processing, storage and transportation process, food safety accidents caused by microbial contamination frequently happen, the life health of people is seriously endangered, the microbial contamination of food is inhibited, and the food safety and quality are ensured to be the important concerns of the global food packaging industry. Paper is the most widely used packaging material, and has wide application in packaging of foods, daily necessities, medicines and the like. However, most of the current food packaging papers only have good mechanical properties such as tensile strength, folding resistance and burst resistance, but have no antibacterial function, and cannot inhibit microbial production and propagation and reduce food waste caused by microbial growth. There is no report on an emulsion for coating a wrapping paper and having pH responsive smart antibacterial properties.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method and application of an intelligent antibacterial coating emulsion for packaging paper.
The following technical scheme solves the technical problems:
the preparation method of the intelligent antibacterial coating emulsion for the packaging paper comprises the following operation steps:
(1) Mixing pH response polymer amino functionalized methacrylate, a cross-linking agent 1, 6-hexanediol diacrylate, a photoinitiator 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone and an antibacterial agent cinnamaldehyde according to the mass ratio of 180-240:70-120:9:120, and magnetically stirring at the speed of 200-400 rpm for 3-5 min at room temperature to obtain mixed oil serving as an oil phase of Pickering emulsion;
(2) Mixing oxidized cellulose nanocrystalline (TOCNC) suspension and cellulose nanofibrillar suspension according to the absolute dry mass ratio of 10:1-3, then adding deionized water, magnetically stirring at the speed of 600-800 rpm for 1-3 hours at room temperature, and preparing the mixed nanocellulose suspension with the mass concentration of 0.75-1.25% as the water phase of Pickering emulsion;
(3) Mixing the oil phase prepared in the step (1) and the water phase prepared in the step (2) to prepare a dispersion system with the oil phase content of 5.0-7.5%, and shearing and emulsifying at the speed of 8000-12000 rpm at room temperature by using a high-speed shearing emulsifying machine for 2-4 min to obtain the Pickering packaging paper intelligent antibacterial coating emulsion.
In the step (1) of the present invention, the amino-functionalized methacrylate is dimethylaminoethyl methacrylate (DMAEMA), dimethylaminopropyl methacrylate (DMAPMA) or diethylaminoethyl methacrylate (DEAEMA).
In the step (2) of the invention, the preparation method of The Oxidized Cellulose Nanocrystalline (TOCNC) suspension comprises the following steps: oxidizing microcrystalline cellulose (MCC) by using 2, 6-tetramethyl piperidine-1-oxygen free radical (TEMPO) to obtain oxidized microcrystalline cellulose, diluting the oxidized microcrystalline cellulose with deionized water until the mass concentration is 0.3-0.5%, homogenizing the oxidized microcrystalline cellulose with a high-pressure micro-jet homogenizer for 15-20 times to obtain a suspension of oxidized cellulose nano crystals (TOCNC), and finally rotationally evaporating the TOCNC suspension by using a rotary evaporator until the mass concentration is 2.0-2.5%, wherein the carboxyl content is 500-1400 mmol/kg, and the average particle size is 150-200 nm.
In the step (2) of the invention, the preparation method of the cellulose nanofibrillar suspension comprises the following steps: after the bleached bagasse pulp board is soaked and defiberized, grinding the slurry obtained by the defibering by using an ultrafine grinding mill for 10-13 times to obtain cellulose nanofibrils with the mass concentration of 2.5-2.8%, diluting the cellulose nanofibrils to the mass concentration of 0.1-0.3% by using deionized water, homogenizing the cellulose nanofibril with a high-pressure micro-jet homogenizer for 5-8 times to obtain a cellulose nanofibril suspension, and finally rotationally evaporating the cellulose nanofibril suspension to the mass concentration of 2.0-2.5% by using a rotary evaporator, wherein the cellulose nanofibrils have the diameter of 20-50 nm and the length of 5-10 mu m.
The invention relates to an application of intelligent antibacterial coating emulsion for packaging paper, which comprises the following specific operation methods: uniformly coating the prepared intelligent antibacterial coating emulsion of the packaging paper on the surface of the packaging paper, irradiating the emulsion by using an ultraviolet curing machine, and initiating amino-functionalized methacrylate in an oil phase and a cross-linking agent 1, 6-hexanediol diacrylate to carry out interfacial photopolymerization, wherein the intensity of the irradiated ultraviolet is 20-40 mW/cm 2 The irradiation time is 10-20 min, the packaging paper is put into a baking oven after the ultraviolet irradiation is finished, and is dried for 24-48 h at the temperature of 25-35 ℃, and the emulsion can form the intelligent antibacterial coating with the microcapsule structure on the surface of the packaging paper.
The emulsion coating mode is automatic coating machine scraper coating, the scraper speed is 1-3 mm/s, and the emulsion coating thickness is 50-80 mu m.
Compared with the prior art, the invention has the following advantages:
(1) The intelligent antibacterial coating emulsion for the packaging paper has the advantages of simple preparation process, environment friendliness and low toxicity, accords with the concept of sustainable development of green, and has uniform particle size and good antibacterial property and standing stability.
(2) The application method of the emulsion prepared by the method is simple to operate, and the intelligent antibacterial microcapsule coating formed on the surface of the packaging paper has good pH stimulus response antibacterial property, so that the food quality can be effectively protected, and the shelf life can be prolonged.
(3) The intelligent antibacterial emulsion coating packaging paper can release active antibacterial substances in real time by responding to the stimulation of external environment conditions, inhibit the growth and propagation of microorganisms, improve the utilization efficiency of the antibacterial agent, and reduce the consumption of the antibacterial agent and adverse effects on the flavor of foods.
Detailed Description
The following examples are provided to better illustrate the present invention, but the scope of the present invention is not limited to the following examples.
In the following examples, the preparation method of The Oxidized Cellulose Nanocrystalline (TOCNC) suspension comprises the following steps: oxidizing microcrystalline cellulose (MCC) by using 2, 6-tetramethyl piperidine-1-oxygen free radical (TEMPO) to obtain oxidized microcrystalline cellulose, diluting the oxidized microcrystalline cellulose with deionized water until the mass concentration is 0.3-0.5%, homogenizing the oxidized microcrystalline cellulose with a high-pressure micro-jet homogenizer for 15-20 times to obtain a suspension of oxidized cellulose nano crystals (TOCNC), and finally rotationally evaporating the TOCNC suspension by using a rotary evaporator until the mass concentration is 2.0-2.5%, wherein the carboxyl content is 500-1400 mmol/kg, and the average particle size is 150-200 nm.
The preparation method of the cellulose nanofibrillar suspension comprises the following steps: after the bleached bagasse pulp board is soaked and defiberized, grinding the slurry obtained by the defibering by using an ultrafine grinding mill for 10-13 times to obtain cellulose nanofibrils with the mass concentration of 2.5-2.8%, diluting the cellulose nanofibrils to the mass concentration of 0.1-0.3% by using deionized water, homogenizing the cellulose nanofibril with a high-pressure micro-jet homogenizer for 5-8 times to obtain a cellulose nanofibril suspension, and finally rotationally evaporating the cellulose nanofibril suspension to the mass concentration of 2.0-2.5% by using a rotary evaporator, wherein the cellulose nanofibrils have the diameter of 20-50 nm and the length of 5-10 mu m.
The nanocellulose adopted by the invention has biodegradability, regenerability, biocompatibility and excellent physical, chemical and mechanical properties. The pH responsive polymer is a polymer which receives or releases protons, and changes surface activity, solubility, volume, configuration or conformation and the like when the environmental pH changes, is often used for preparing a responsive intelligent material, and can endow the microcapsule prepared by using a Pickering emulsion template with good pH response performance when being used as a Pickering emulsion oil phase material, so that the intelligent controlled-release microcapsule encapsulated active substance is released.
Example 1
The pH response polymer of dimethylaminoethyl methacrylate (DMAEMA), a crosslinking agent of 1, 6-hexanediol diacrylate, a photoinitiator of 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone and an antibacterial agent of cinnamaldehyde are mixed according to the mass ratio of 180:120:9:120, and then magnetically stirred at the speed of 200rpm for 5min at room temperature to obtain mixed oil which is used as an oil phase of Pickering emulsion. Mixing oxidized cellulose nanocrystalline (TOCNC) suspension and cellulose nanofibrillar suspension according to an absolute dry mass ratio of 10:1, adding deionized water, and magnetically stirring at 600rpm for 3 hours at room temperature to prepare a mixed nanocellulose suspension with a mass concentration of 0.75%, wherein the mixed nanocellulose suspension is used as a water phase of the emulsion. Mixing the oil phase and the water phase to prepare a dispersion system with the oil phase content of 5.0%, and shearing and emulsifying for 4min at 8000rpm at room temperature by using a high-speed shearing and emulsifying machine to obtain the finished product packaging paper intelligent antibacterial coating emulsion (namely the oil-in-water antibacterial Pickering emulsion). The prepared intelligent antibacterial coating emulsion for the packaging paper has good standing stability and antibacterial property, does not generate phase separation or coalescence phenomenon after standing for 5 hours, and has a minimum antibacterial concentration of 12.5 mu L/mL for Escherichia coli.
The prepared intelligent antibacterial coating emulsion of the packaging paper is uniformly coated on the packaging paper with the ration of 100g/m by using an automatic coating machine 2 White kraft paper surface, doctor blade speedThe degree was 1mm/s, the thickness of the emulsion coating was 50. Mu.m, and then the emulsion was irradiated with an ultraviolet light having an intensity of 20mW/cm using an ultraviolet light curing machine 2 The irradiation time was 20min to initiate interfacial photopolymerization of the amino-functionalized methacrylate in the oil phase with the crosslinker 1, 6-hexanediol diacrylate. And after the ultraviolet irradiation is finished, the packaging paper is put into a baking oven at 25 ℃ to be dried for 48 hours, and the emulsion forms an intelligent antibacterial coating with a microcapsule structure on the surface of the packaging paper. The packaging paper is soaked in phosphate buffer solution with pH value of 7.2 and 4.0 for 9 hours, the cumulative release rate of the antibacterial agent cinnamaldehyde is 17.5% and 41%, the antibacterial rate of the antibacterial agent cinnamaldehyde on escherichia coli is 59.5% and 80.1%, the hydrophilicity of the microcapsule is enhanced due to the protonation of the amido of the microcapsule layer along with the reduction of the pH value of the buffer solution, the swelling degree is increased, the release amount of the cinnamaldehyde is increased, the antibacterial performance of the packaging paper is enhanced, and the packaging paper has sensitive pH response intelligent antibacterial performance.
Example 2
The pH response polymer of dimethylaminopropyl methacrylate (DMAPMA), cross-linking agent of 1, 6-hexanediol diacrylate, photoinitiator of 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone and antibacterial agent of cinnamaldehyde are mixed according to the mass ratio of 215:85:9:120, and then the mixture is magnetically stirred at the speed of 300rpm for 4min at room temperature to obtain mixed oil which is used as the oil phase of Pickering emulsion. Mixing oxidized cellulose nanocrystalline (TOCNC) suspension and cellulose nanofibrillar suspension according to an absolute dry mass ratio of 10:2, adding deionized water, magnetically stirring at 700rpm for 2 hours at room temperature, and preparing a mixed nanocellulose suspension with a mass concentration of 1.0% as an aqueous phase of the emulsion. Mixing the oil phase and the water phase to prepare a dispersion system with the oil phase mass fraction of 6.0%, and shearing and emulsifying for 3min at the speed of 10000rpm at room temperature by using a high-speed shearing and emulsifying machine to obtain the finished product packaging paper intelligent antibacterial coating emulsion (namely the oil-in-water antibacterial Pickering emulsion). The prepared intelligent antibacterial coating emulsion for the packaging paper has good standing stability and antibacterial property, does not generate phase separation or coalescence phenomenon after standing for 5 hours, and has a minimum antibacterial concentration of 11.3 mu L/mL for Escherichia coli.
The resulting bag was wrapped using an automated coaterThe intelligent antibacterial coating emulsion for paper is uniformly coated on the paper with the quantitative rate of 150g/m 2 The doctor speed of the white background copper plate is 2mm/s, the thickness of the emulsion coating is 70 mu m, then an ultraviolet curing machine is used for irradiating the emulsion, and the ultraviolet intensity is 30mW/cm 2 The irradiation time is 15min, so as to induce the interfacial photopolymerization reaction of the amino-functionalized methacrylate in the oil phase and the cross-linking agent 1, 6-hexanediol diacrylate. And after the ultraviolet irradiation is finished, the packaging paper is put into a baking oven at 30 ℃ to be dried for 36 hours, and the emulsion forms an intelligent antibacterial coating with a microcapsule structure on the surface of the packaging paper. The packaging paper is soaked in phosphate buffer solution with pH value of 7.2 and 4.0 for 9 hours, the cumulative release rate of the antibacterial agent cinnamaldehyde is 20% and 50%, the antibacterial rate of the antibacterial agent cinnamaldehyde on escherichia coli is 61% and 90%, along with the reduction of the pH value of the buffer solution, the amino group of the microcapsule layer is protonated to enhance the hydrophilicity of the microcapsule, the swelling degree is increased, the release amount of the cinnamaldehyde is increased, the antibacterial performance of the packaging paper is enhanced, and the packaging paper has sensitive pH response intelligent antibacterial performance.
Example 3
The pH response polymer diethylaminoethyl methacrylate (DEAEMA), the cross-linking agent 1, 6-hexanediol diacrylate, the photoinitiator 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone and the antibacterial agent cinnamaldehyde are mixed according to the mass ratio of 240:70:9:120, and then the mixture is magnetically stirred at the speed of 400rpm for 3min at room temperature to obtain mixed oil which is used as the oil phase of Pickering emulsion. Mixing oxidized cellulose nanocrystalline (TOCNC) suspension and cellulose nanofibrillar suspension according to an absolute dry mass ratio of 10:3, adding deionized water, magnetically stirring at 800rpm for 1h at room temperature, and preparing a mixed nanocellulose suspension with a mass concentration of 1.25% as a water phase of the emulsion. Mixing the oil phase and the water phase to prepare a dispersion system with the oil phase mass fraction of 7.5%, and shearing and emulsifying for 2min at 12000rpm at room temperature by using a high-speed shearing and emulsifying machine to obtain the finished product packaging paper intelligent antibacterial coating emulsion (namely the oil-in-water antibacterial Pickering emulsion). The prepared intelligent antibacterial coating emulsion for the packaging paper has good standing stability and antibacterial property, does not generate phase separation or coalescence phenomenon after standing for 5 hours, and has a minimum antibacterial concentration of 10.0 mu L/mL for escherichia coli.
The prepared intelligent antibacterial coating emulsion of the packaging paper is uniformly coated on a quantitative 200g/m by using an automatic coating machine 2 The surface of the food parchment paper of (3) the scraper speed was 3mm/s, the thickness of the emulsion coating was 80 μm, then the emulsion was irradiated with a UV curing machine, the UV intensity was 40mW/cm 2 The irradiation time is 10min, so as to induce the interfacial photopolymerization reaction of the amino-functionalized methacrylate in the oil phase and the cross-linking agent 1, 6-hexanediol diacrylate. And after the ultraviolet irradiation is finished, the packaging paper is put into a baking oven at 35 ℃ to be dried for 24 hours, and the emulsion forms an intelligent antibacterial coating with a microcapsule structure on the surface of the packaging paper. The packaging paper is soaked in phosphate buffer solution with pH value of 7.2 and 4.0 for 9 hours, the accumulated release rate of the antibacterial agent cinnamaldehyde is 25% and 62%, the antibacterial rate of the antibacterial agent cinnamaldehyde on escherichia coli is 70% and 99%, along with the decrease of the pH value of the buffer solution, the amine group of the microcapsule layer is protonated to enhance the hydrophilicity of the microcapsule, the swelling degree is increased, the release amount of the cinnamaldehyde is increased, the antibacterial performance of the packaging paper is enhanced, and the packaging paper has sensitive pH response intelligent antibacterial performance.

Claims (4)

1. The preparation method of the intelligent antibacterial coating emulsion for the packaging paper is characterized by comprising the following operation steps:
(1) Mixing pH response polymer amino functionalized methacrylate, a cross-linking agent 1, 6-hexanediol diacrylate, a photoinitiator 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone and an antibacterial agent cinnamaldehyde according to the mass ratio of 180-240:70-120:9:120, and magnetically stirring at the speed of 200-400 rpm for 3-5 min at room temperature to obtain mixed oil serving as an oil phase of Pickering emulsion; the amino-functionalized methacrylate is dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylate or diethylaminoethyl methacrylate;
(2) Mixing the oxidized cellulose nanocrystalline suspension and the cellulose nanofibril suspension according to an absolute dry mass ratio of 10:1-3, then adding deionized water, magnetically stirring at a speed of 600-800 rpm for 1-3 hours at room temperature, and preparing the mixed nanocellulose suspension with a mass concentration of 0.75-1.25% to be used as a water phase of Pickering emulsion;
the preparation method of the oxidized cellulose nanocrystalline suspension comprises the following steps: oxidizing microcrystalline cellulose by using 2, 6-tetramethyl piperidine-1-oxygen free radical to obtain oxidized microcrystalline cellulose, diluting the oxidized microcrystalline cellulose to the mass concentration of 0.3-0.5% by using deionized water, homogenizing the oxidized microcrystalline cellulose by using a high-pressure micro-jet homogenizer for 15-20 times to obtain oxidized cellulose nanocrystalline suspension, and finally rotationally evaporating the suspension to the mass concentration of 2.0-2.5% by using a rotary evaporator, wherein the carboxyl content of the oxidized microcrystalline cellulose is 500-1400 mmol/kg, and the average particle size of the oxidized microcrystalline cellulose is 150-200 nm.
The preparation method of the cellulose nanofibrillar suspension comprises the following steps: after the bleached bagasse pulp board is soaked and defiberized, grinding the slurry obtained by the defibering by using an ultrafine grinding mill for 10-13 times to obtain cellulose nanofibrils with the mass concentration of 2.5-2.8%, diluting the cellulose nanofibrils to the mass concentration of 0.1-0.3% by using deionized water, homogenizing the cellulose nanofibril with a high-pressure micro-jet homogenizer for 5-8 times to obtain a cellulose nanofibril suspension, and finally rotationally evaporating the cellulose nanofibril suspension to the mass concentration of 2.0-2.5% by using a rotary evaporator, wherein the cellulose nanofibrils have the diameter of 20-50 nm and the length of 5-10 mu m.
(3) Mixing the oil phase prepared in the step (1) and the water phase prepared in the step (2) to prepare a dispersion system with the oil phase content of 5.0-7.5%, and shearing and emulsifying at the speed of 8000-12000 rpm at room temperature by using a high-speed shearing emulsifying machine for 2-4 min to obtain the Pickering packaging paper intelligent antibacterial coating emulsion.
2. The application of the intelligent antibacterial coating emulsion for the packaging paper, which is obtained by the preparation method according to claim 1, is characterized in that the application operation method is as follows: uniformly coating the prepared intelligent antibacterial coating emulsion of the packaging paper on the surface of the packaging paper, irradiating the emulsion by using an ultraviolet curing machine, and initiating amino-functionalized methacrylate in an oil phase and a cross-linking agent 1, 6-hexanediol diacrylate to carry out interfacial photopolymerization, wherein the intensity of the irradiated ultraviolet is 20-40 mW/cm 2 The irradiation time is 10-20 min, and the ultraviolet light irradiation is completedThe packaging paper is put into a baking oven and dried for 24 to 48 hours at the temperature of 25 to 35 ℃, and the emulsion can form an intelligent antibacterial coating with a microcapsule structure on the surface of the packaging paper.
3. The application of the intelligent antibacterial coating emulsion for the packaging paper according to claim 2, wherein the emulsion coating mode is automatic coater doctor blade coating, the speed of the doctor blade is 1-3 mm/s, and the thickness of the emulsion coating is 50-80 μm.
4. The use of the intelligent antibacterial coating emulsion for packaging paper according to claim 2, wherein the packaging paper comprises a quantitative content of 100-200 g/m 2 White kraft paper, white background art paperboard and food parchment.
CN202211131943.9A 2022-09-16 2022-09-16 Preparation method and application of intelligent antibacterial coating emulsion for packaging paper Active CN115323823B (en)

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