CN114041499A - Preparation method of antibacterial fresh-keeping material - Google Patents

Preparation method of antibacterial fresh-keeping material Download PDF

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Publication number
CN114041499A
CN114041499A CN202111190399.0A CN202111190399A CN114041499A CN 114041499 A CN114041499 A CN 114041499A CN 202111190399 A CN202111190399 A CN 202111190399A CN 114041499 A CN114041499 A CN 114041499A
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antibacterial
preparing
fresh
coating solution
coating
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CN202111190399.0A
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Inventor
欧阳申珅
刘国金
陈妙金
陈鹏
刘明
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Ningbo Aerospace Miri Technology Co ltd
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Ningbo Aerospace Miri Technology Co ltd
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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/14—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10
    • A23B7/153—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of liquids or solids
    • A23B7/157—Inorganic compounds
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/14—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10
    • A23B7/153—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of liquids or solids
    • A23B7/154—Organic compounds; Microorganisms; Enzymes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/08—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • 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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/46—Non-macromolecular organic compounds
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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

Abstract

The invention discloses a preparation method of an antibacterial fresh-keeping material, which comprises the steps of preparing a base material, preparing a coating liquid 1, coating the coating liquid 1 on the front surface of the base material, curing, soaking in a sodium hydroxide aqueous solution, taking out and drying, preparing a coating liquid 2, coating the coating liquid 2 on centrifugal paper, then reversely covering the centrifugal paper on the back surface of the base material, pressing and drying, respectively irradiating the front surface and the back surface of the coated material with ultraviolet light, cutting, edge sealing and packaging, and performing broad-spectrum antibacterial treatment, wherein the antibacterial rate is more than 90 percent, the fresh curing time can be effectively prolonged, the rotting rate can be reduced, and the preparation method is particularly suitable for fresh transportation and storage under severe conditions of high temperature, high humidity and the like, and the loss rate is reduced. For example, for honey peaches, the curing and softening time can be prolonged by 2-5 days, and the deterioration and rotting time can be prolonged by 6-10 days; the preparation process is simple, and the method is suitable for batch production and popularization and use.

Description

Preparation method of antibacterial fresh-keeping material
Technical Field
The invention relates to a preparation method of a fresh-keeping material, in particular to a preparation method of an antibacterial fresh-keeping material, belonging to the field of preparation of fresh-keeping materials.
Background
In the field of fresh-keeping of fruits and vegetables, the fresh-keeping method and technical means adopted at home and abroad mainly comprise: physical and chemical. The method mainly regulates and controls three major elements which play a key role in the preservation quality: 1. control of the aging process, typically by control of respiration; 2. controlling microorganisms, mainly by controlling spoilage bacteria; 3. the control of internal water evaporation is mainly realized by controlling the relative temperature of the environment and structuring the water among cells. For example: critical low-temperature high-humidity fresh keeping, low-dose radiation pretreatment, ultraviolet fresh keeping, modified atmosphere fresh keeping, high-pressure fresh keeping, antibacterial packaging fresh keeping and the like. Aiming at the development of packaging and fresh-keeping materials, the packaging and fresh-keeping materials are mainly prepared into application forms of fresh-keeping films, fresh-keeping paper, fresh-keeping bags and other products by optimizing packaging base materials, and the packaging materials are endowed with the effects of physical barrier function, selective air and moisture resistance, resistance of the loss of contents, resistance of harmful influence of the external environment, inhibition of respiration and the like. Or the packaging material is added with the antibacterial nano material, so that the functions of delaying after-ripening and aging, inhibiting the growth of surface microorganisms, improving the storage quality and the like are achieved, and the effects of keeping food fresh, reducing the transportation loss and prolonging the storage period are achieved. However, if the material is physically blocked by a hydrophobic, oleophobic, gas impermeable material alone, the failure of the ethylene released by the freshness product to release may accelerate decay. If the material is hydrophilic and breathable, the material is easily polluted and difficult to block, so that the antibacterial effect is limited.
Disclosure of Invention
The invention aims to prepare an antibacterial fresh-keeping film, which has different front and back surfaces and similar Janus effect, a hydrophilic layer in contact with a fresh-keeping product has excellent curing time prolonging, fresh-keeping and antibacterial properties, and the other surface in contact with air has the technical characteristics of good hydrophobicity, antifouling self-cleaning, antibacterial property and the like.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of an antibacterial fresh-keeping material comprises the following steps:
step 1): preparing a base material, wherein the base material comprises materials such as PET, PP, PLA (polylactic acid) or Polyhydroxyalkanoate (PHA) and the like, and the base material is prepared into a film, paper, non-woven fabric or other forms with a multi-level micro/nano pore structure with a certain thickness (0.1-3 mm);
step 2): preparing a coating solution 1, wherein the coating solution 1 comprises porous nano titanium dioxide particles, nano zinc oxide particles, glycerol, acrylic acid, methyl methacrylate, an ultraviolet light curing initiation agent and a diluent hydroxyethyl acrylate, coating the coating solution 1 on the front surface of a base material, then placing the base material coated with the coating solution 1 under an ultraviolet lamp for curing treatment for 0.5-5h, taking out after drying, placing in a sodium hydroxide aqueous solution, soaking for 12h, taking out and drying;
step 3): preparing a coating solution 2, wherein the coating solution 1 comprises a silane coupling agent, a silica sol, alcohol, waterborne polyurethane, nano zinc oxide and water, coating the coating solution 2 on centrifugal paper, then reversely buckling the centrifugal paper on the reverse side of a substrate, pressing for 5-10s, attaching the coating solution 2 to the substrate, and drying;
step 4): irradiating the front surface and the back surface of the base material with ultraviolet light for 0.5-1 hour respectively, and performing cutting, edge sealing and packaging treatment to obtain the antibacterial fresh-keeping material.
Preferably, the coating liquid 1 comprises 3% -5% of porous nano titanium dioxide particles, 1% -2% of nano zinc oxide particles, 2% -4% of glycerol, 10% -15% of acrylic acid, 5% -10% of methyl methacrylate, 0.025% -0.05% of ultraviolet curing initiation binder, and the balance of diluent hydroxyethyl acrylate.
Preferably, the coating solution 1 comprises 0.5-1% of silane coupling agent, 2-5% of silica sol, 15-20% of alcohol, 10-15% of waterborne polyurethane, 2-5% of nano zinc oxide and the balance of water.
Preferably, the substrate coated with the coating solution 1 in the step 2) is placed under an ultraviolet lamp with power of 50-500 watts for curing treatment.
Has the advantages that:
1. broad-spectrum antibacterial property, and the antibacterial rate of Candida albicans, Staphylococcus aureus and Escherichia coli can reach more than 90%;
2. can effectively prolong the curing time of the fresh food and reduce the rotting rate, is particularly suitable for transporting and storing the fresh food under severe conditions of high temperature, high humidity and the like, and reduces the loss rate. For example, for honey peaches, the curing and softening time can be prolonged by 2-5 days, and the deterioration and rotting time can be prolonged by 6-10 days; the preparation process is simple, and the method is suitable for batch production and popularization.
Drawings
FIG. 1 is an electron micrograph of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following examples. Specific embodiments include, but are not limited to, embodiments that take endpoint values and intermediate values.
The invention relates to a preparation method of an antibacterial fresh-keeping material, which comprises the following steps:
(1) preparing a substrate including a substrate in the form of a film, paper, non-woven fabric, etc., prepared from PET, PP, PLA (polylactic acid), Polyhydroxyalkanoate (PHA) having a multi-stage micro/nano-pore structure with a certain thickness (0.1-3 mm);
(2) preparing a coating solution 1, wherein the coating solution 1 comprises 3-5% of porous nano titanium dioxide particles, 1-2% of nano zinc oxide particles, 2-4% of glycerol, 10-15% of acrylic acid, 5-10% of methyl methacrylate, 0.025-0.05% of ultraviolet curing initiation adhesive and the balance of diluent hydroxyethyl acrylate, coating the coating solution on a first surface (set as a front surface, namely a surface which is in contact with a preserved product) of a base material, then placing the base material coated with the coating solution under an ultraviolet lamp (with the power of 50-500 watts) for curing treatment for 0.5-5 hours, taking out the base material after drying, placing the base material in a sodium hydroxide aqueous solution, soaking for 12 hours, taking out and drying;
(3) preparing a coating solution 2, wherein the coating solution 1 comprises 0.5-1% of silane coupling agent, 2-5% of silica sol, 15-20% of alcohol, 10-15% of waterborne polyurethane, 2-5% of nano zinc oxide and the balance of water, coating the coating solution on centrifugal paper, then reversely covering the centrifugal paper on a second surface (the reverse surface is set, namely the surface contacting with air) of the substrate, pressing for 5-10s, attaching the coating 2 to the substrate, and drying;
(4) irradiating the front and back surfaces of the coated material with ultraviolet light for 0.5-1 hr, cutting, edge sealing, and packaging.
Watch I (curing process is judged according to curing time, color, smell and hand feeling)
Figure BDA0003300904560000041
The antibacterial preservation function is characterized by the curing speed, and the faster the curing speed is, the poorer the antibacterial preservation function is; on the contrary, the slower the ripening speed is, the better the antibacterial and freshness-retaining functions are.
The antibacterial material No. 3 refers to: experimental group of antibacterial and fresh-keeping functional materials prepared by adopting research
The purpose compared to the blank group was: curing the blank group of the non-antibacterial packages the next day; after the antibacterial material is adopted, the curing time can be prolonged to the fourth day, and the antibacterial fresh-keeping function is realized.
Second (curing process is judged according to curing time, color, smell and hand feeling)
Figure BDA0003300904560000051
Material No. 1, material No. 2, material No. 3 refer to other antibacterial materials, respectively: no. 1 adopts a conventional preservative film material sold in the market; no. 2 adopts a conventional antibacterial preservative film material sold in the market; no. 3 adopts a packaging film material added with a commercial photocatalytic nano material (P25); the material No. 4 refers to an antibacterial fresh-keeping material adopting the technology of the invention.
The purpose compared to the blank group was: the blank group is a blank comparison group without the antibacterial material, and the comparison shows that after the antibacterial material is used, the antibacterial fresh-keeping effect is represented by the aging time extension degree of the protected fresh food.
Third and fifth day experiment conclusion (judging whether the test article is rotten or not according to rotting time, rotting amount, rotting area and mould)
Figure BDA0003300904560000061
The antibacterial preservation function is characterized by the decay speed, and the higher the decay speed is, the larger the decay area is, the poorer the antibacterial preservation function is; on the contrary, the slower the rotting speed is, the smaller the rotting area is, the better the antibacterial and fresh-keeping functions are.
Material No. 1, material No. 2, material No. 3, material No. 4 refer to other antibacterial materials, respectively: no. 1 adopts a conventional preservative film material sold in the market; no. 2 adopts a conventional antibacterial preservative film material sold in the market; no. 3 adopts a packaging film material added with a commercial photo-catalytic nano material (P25); the material No. 4 refers to an antibacterial and fresh-keeping material adopting the technology.
The purpose compared to the blank group was: the blank group is a blank comparison group without the antibacterial material, and the comparison shows that after the antibacterial material is used, the antibacterial fresh-keeping effect is represented by the rotting time and the rotting degree of the protected fresh food.
Fourth (curing process is judged according to curing time, color, smell and hand feeling)
Figure BDA0003300904560000071
Material No. 1, material No. 2, material No. 3 refer to other antibacterial materials, respectively: no. 1 adopts a conventional packing net bag material sold in the market; no. 2 adopts a conventional antibacterial packing net bag material sold in the market; no. 3 adopts a packaging film material added with a commercially available antibacterial agent; the material No. 4 refers to an antibacterial fresh-keeping material adopting the technology of the invention.
The purpose compared to the blank group was: the blank group is a blank comparison group without the antibacterial material, and the comparison shows that after the antibacterial material is used, the antibacterial fresh-keeping effect is represented by the aging time extension degree of the protected fresh food.
Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.

Claims (5)

1. The preparation method of the antibacterial fresh-keeping material is characterized by comprising the following steps:
step 1): preparing a substrate, wherein the material of the substrate comprises PET or PP or PLA or PHA, and the substrate is prepared from the material and is in the form of a film or paper or non-woven fabric with a certain thickness and a multistage micro/nano pore structure;
step 2): preparing a coating solution 1, wherein the coating solution 1 comprises porous nano titanium dioxide particles, nano zinc oxide particles, glycerol, acrylic acid, methyl methacrylate, an ultraviolet light curing initiation agent and a diluent hydroxyethyl acrylate, coating the coating solution 1 on the front surface of a base material, then placing the base material coated with the coating solution 1 under an ultraviolet lamp for curing treatment for 0.5-5h, taking out after drying, placing in a sodium hydroxide aqueous solution, soaking for 12h, taking out and drying;
step 3): preparing a coating solution 2, wherein the coating solution 1 comprises a silane coupling agent, a silica sol, alcohol, waterborne polyurethane, nano zinc oxide and water, coating the coating solution 2 on centrifugal paper, then reversely buckling the centrifugal paper on the reverse side of a substrate, pressing for 5-10s, attaching the coating solution 2 to the substrate, and drying;
step 4): irradiating the front surface and the back surface of the base material with ultraviolet light for 0.5-1 hour respectively, and performing cutting, edge sealing and packaging treatment to obtain the antibacterial fresh-keeping material.
2. The method for preparing an antibacterial fresh-keeping material according to claim 1, characterized in that: the coating liquid 1 comprises 3-5% of porous nano titanium dioxide particles, 1-2% of nano zinc oxide particles, 2-4% of glycerol, 10-15% of acrylic acid, 5-10% of methyl methacrylate, 0.025-0.05% of ultraviolet curing initiation agent and the balance of diluent hydroxyethyl acrylate.
3. The method for preparing an antibacterial freshness-retaining material according to claim 1 or 2, characterized in that: the coating solution 1 comprises 0.5-1% of silane coupling agent, 2-5% of silica sol, 15-20% of alcohol, 10-15% of waterborne polyurethane, 2-5% of nano zinc oxide and the balance of water.
4. The method for preparing an antibacterial fresh-keeping material according to claim 1, characterized in that: in the step 2), the base material coated with the coating liquid 1 is placed under an ultraviolet lamp with power of 50-500 watts for curing treatment.
5. The method for preparing an antibacterial fresh-keeping material according to claim 1, characterized in that: the certain thickness range in step 1) is 0.1-3 mm.
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CN105167111A (en) * 2015-10-23 2015-12-23 天津科技大学 Preparation method for water-absorbing anti-microbial preservative paper capable of indicating freshness of fresh food

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CN105167111A (en) * 2015-10-23 2015-12-23 天津科技大学 Preparation method for water-absorbing anti-microbial preservative paper capable of indicating freshness of fresh food

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