CN113635637A - Intelligent fresh-keeping packaging material for realizing air permeability adjustment based on temperature-sensitive material and preparation method thereof - Google Patents

Intelligent fresh-keeping packaging material for realizing air permeability adjustment based on temperature-sensitive material and preparation method thereof Download PDF

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CN113635637A
CN113635637A CN202110978735.1A CN202110978735A CN113635637A CN 113635637 A CN113635637 A CN 113635637A CN 202110978735 A CN202110978735 A CN 202110978735A CN 113635637 A CN113635637 A CN 113635637A
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temperature
packaging material
air permeability
sensitive material
intelligent fresh
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焦逸清
何浩明
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Jiangsu Ruizefeng Standard Technical Service Co ltd
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Jiangsu Ruizefeng Standard Technical Service Co ltd
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    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B65D65/40—Applications of laminates for particular packaging purposes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36—After-treatment
    • C08J9/365—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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/24—Homopolymers or copolymers of amides or imides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2439/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2471/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2485/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Derivatives of such polymers
    • C08J2485/02—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Derivatives of such polymers containing phosphorus

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  • Mechanical Engineering (AREA)
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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Packages (AREA)
  • Wrappers (AREA)
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Abstract

The invention relates to a fresh packaging material, in particular to an intelligent fresh packaging material for realizing air permeability adjustment based on a temperature-sensitive material and a preparation method thereof. The method comprises the following operations: coating an adhesive on the surface of the strength layer, attaching a heat sealing layer, and cooling to obtain a composite material; performing laser drilling treatment on the composite material to obtain a laser-drilled breathable film; adding the temperature-sensitive material and the grafting initiator into distilled water, stirring and dissolving to prepare a polymer aqueous solution; uniformly coating the polymer aqueous solution on a laser-drilled breathable film, and drying to finally prepare the high-breathability intelligent fresh packaging material; by coating the polymer aqueous solution made of temperature-sensitive materials on the surface of the laser-drilled breathable film, the air permeability of the breathable film is obviously changed along with the change of temperature, the air holes are expanded when the temperature is high, the air holes are reduced when the temperature is low, and the freshness of the product can be still maintained under the condition of short-time cold chain loss.

Description

Intelligent fresh-keeping packaging material for realizing air permeability adjustment based on temperature-sensitive material and preparation method thereof
Technical Field
The invention relates to a fresh packaging material, in particular to an intelligent fresh packaging material for realizing air permeability adjustment based on a temperature-sensitive material and a preparation method thereof.
Background
The fresh fruits and vegetables are kept under the respiration of individuals, so that the interference and breeding of bacteria and the change of quality are prevented, the respiration is reduced, the loss of nutrition and moisture is reduced, and the aging and maturity of fruit and vegetable products are inhibited. The preservation of fruit and vegetable products requires low temperature and appropriate humidity, the low temperature can effectively inhibit respiration, and the appropriate humidity can compensate the water loss due to respiration. In addition, care should be taken to preserve the gaseous components of the environment. Oxygen and carbon dioxide can affect respiration, properly reduce oxygen, increase carbon dioxide content, and inhibit food maturation and aging. This packaging technique by changing the gas environment around the fresh produce is generally referred to as modified atmosphere packaging.
The key point of the modified atmosphere packaging is the gas ratio of modified atmosphere, if the oxygen concentration is higher, the respiration of the fruits and vegetables is enhanced, and the post-curing effect is promoted, so that the storage time of the fruits and vegetables is reduced; if the oxygen concentration is lower than the atmosphere and the carbon dioxide concentration is higher than the atmosphere, the respiration of the fruits and vegetables is inhibited in such an environment, the deterioration or after-ripening of the fruits and vegetables can be reduced, and the storage period is prolonged; on the other hand, if the oxygen concentration is too low and the carbon dioxide concentration is too high, the fruits and vegetables may be abnormally metabolized to cause deterioration such as generation of offensive odor or softening. Therefore, the storage requirement of the fresh fruits and vegetables can be met to the maximum extent only by ensuring the proper proportion of the modified atmosphere gas in the modified atmosphere package.
The principle of the method is that the oxygen concentration in a packaging bag is reduced and certain carbon dioxide concentration and humidity in the bag are maintained by means of the metabolism of fruits and vegetables, so that the fruits and vegetables are in a dormant state with lower respiratory strength, the consumption of nutrients in the body and the evaporation of water are reduced, and the fresh-keeping period of the fruits and vegetables is prolonged. In the prior art, the packaging material is generally perforated by laser, so that the packaging material becomes a high-permeability material with appropriate gas permeability. Fresh fruit vegetables in the packing can consume oxygen and release carbon dioxide because respiration, thereby make the oxygen concentration in the fresh packing be less than the external world, produce carbon dioxide in the time of breathing, thereby the inside carbon dioxide concentration of packing can be higher than the external world, the material of high permeability can exchange inside and outside gas through the bleeder vent, thereby the oxygen concentration that keeps in the packing is always in the state that is less than external and carbon dioxide concentration slightly is higher than the external world, thereby the storage period through the respiratory of restraining fresh fruit vegetables is used for prolonging fruit vegetables. The air permeability of the packaging material must be strictly designed to match the breathing rate of fresh products, and too high air permeability can bring more gas exchange inside and outside the package and too high oxygen ratio inside the package, so that the effect of inhibiting breathing is weakened, and the shelf life is further influenced; too low a gas permeability results in too slow a gas exchange rate, possibly leading to degradation problems with anaerobic respiration. The air permeability of the packaging material is generally controlled by the size and number of the laser-drilled holes.
However, existing modified atmosphere packaging also has its drawbacks. Firstly, the high permeability of the packaging material is not selective, and not only can pass through oxygen and carbon dioxide, but also can pass through water vapor, thereby causing the water loss of the fresh product. Second, the packing is only applicable to under the condition that has good cold-stored storage environment, and in case ambient temperature has taken place the change, the respiratory rate of giving birth to bright product can increase by a wide margin, and packaging material's gas permeation rate still maintains unchangeably, often can lead to giving birth to bright product excessive consumption oxygen this moment to take place the problem that oxygen-free breathing declines. The transportation and storage process of fresh fruits and vegetables needs to be supported by a cold chain link, the current cold chain transportation condition of China is still imperfect, and the condition of cold chain loss or imperfect cold chain is often encountered in the transportation or storage process, so that a great amount of loss is brought every year. The market urgently needs a novel packaging material which can solve the existing problems.
Disclosure of Invention
The invention aims to provide an intelligent fresh-keeping packaging material for realizing air permeability adjustment based on a temperature-sensitive material and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the above objects, in one aspect, the present invention provides an intelligent fresh packaging material for achieving air permeability adjustment based on a temperature-sensitive material, comprising a strength layer, a heat-sealing layer and a temperature-sensitive material;
the strength layer is selected from one or more of biaxially oriented polyethylene, biaxially oriented polyamide and biaxially oriented polypropylene;
the heat-sealing layer is at least one selected from a blown polyethylene film and a cast polypropylene film, a modifier is blended in the heat-sealing layer, and the modifier is at least one selected from glycerol, epoxy resin and rosin resin and is used for improving the bonding effect between the heat-sealing layer and the strength layer;
the temperature-sensitive material comprises at least one of poly N-isopropyl acrylamide, poly N-vinyl caprolactam, poly 2-ethyl-2-oxazoline, polymethacrylate and poly 2-ethoxy-2-oxo-1, 3, 2-dioxaphospholane.
As a further improvement of the technical scheme, the thickness of the strength layer is 8-16 um.
As a further improvement of the technical scheme, the thickness of the heat sealing layer is 52-68 um.
As a further improvement of the technical scheme, the heat sealing layer is of a three-layer film blowing structure, and the layer thickness ratio is 1:2: 1.
On the other hand, the invention provides a preparation method of the intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material, which comprises the following operation steps of:
s1, coating an adhesive on the surface of the strength layer, drying the adhesive, melting the adhesive, attaching a heat sealing layer, and cooling to obtain a composite material;
s2, performing laser punching treatment on the composite material on a rewinder provided with laser punching to obtain a laser punching breathable film;
s3, adding the temperature-sensitive material and the grafting initiator into distilled water, stirring and dissolving to obtain a polymer aqueous solution;
s4, uniformly coating the polymer aqueous solution on a laser-drilled breathable film, and drying to obtain the high-breathability intelligent fresh packaging material.
Preferably, in the S1, the adhesive is polyurethane glue, and the gluing amount is 1-3g/m 2.
Preferably, in the S2, the size of the laser drilling is 0.5-1.5um, and the drilling density is 2-3/cm 2.
Preferably, in the S3, the grafting initiator is one or more selected from benzoyl peroxide, dicumyl peroxide and 2, 3-dimethyl 2, 3-diphenylbutane.
Preferably, in S3, the mass fraction of the polymer aqueous solution is as follows: grafting initiator: distilled water =10:0.1: 100.
Preferably, in the step S4, the drying treatment is performed by a forced air oven, and the oven temperature is 75-85 ℃.
When the strength layer and the heat sealing layer are bonded, the adhesive which is polyurethane can perform copolymerization reaction with tackifying resin on the surface of the heat sealing layer again to generate high-viscosity polyurethane adhesive which exists between the heat sealing layer and the strength layer, so that the bonding effect of the heat sealing layer and the strength layer is further improved, and the change speed of holes is faster when the size of the prepared packaging material changes at temperature sensitivity, and the condition of film separation is avoided.
Compared with the prior art, the invention has the beneficial effects that:
according to the intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material and the preparation method thereof, the polymer aqueous solution made of the temperature-sensitive material is coated on the surface of the laser-punched breathable film, so that the air permeability of the breathable film is obviously changed along with the change of temperature, the air holes are expanded when the temperature is high, the air holes are reduced when the temperature is low, the freshness of the product can be still kept under the condition of short-time cold chain loss, the long shelf life is maintained, and the intelligent fresh-keeping packaging material has high commercial value.
Drawings
FIG. 1 is an overall flow chart of embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the molecular formula of the temperature-sensitive material in embodiment 1 of the present invention;
FIG. 3 is a graph showing the comparison of oxygen transmission rates of example 1 and comparative example 1 in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1 an intelligent fresh-keeping packaging material for realizing air permeability adjustment based on a temperature-sensitive material and a preparation method thereof, comprising
Firstly, preparation of breathable film
Coating an adhesive on the surface of the strength layer with the thickness of 8-16um, drying the adhesive, melting the adhesive, attaching a heat sealing layer with the thickness of 52-68um, and cooling to obtain the composite material, wherein the adhesive is polyurethane glue, and the gluing amount is 1-3g/m 2; wherein, the strength layer is selected from one or more of biaxially oriented polyethylene, biaxially oriented polyamide and biaxially oriented polypropylene, the heat sealing layer is selected from at least one of blow molding polyethylene film and cast polypropylene film, the heat sealing layer is of a three-layer film blowing structure, and the layer thickness ratio is 1:2: 1;
and (3) carrying out laser punching treatment on the composite material on a rewinding machine provided with laser punching to obtain a laser punching breathable film, wherein the size of laser punching is 0.5-1.5um, and the punching density is 2-3/cm 2.
Preparation of aqueous polymer solutions
Adding the temperature-sensitive material and the grafting initiator into distilled water, stirring and dissolving to prepare a polymer aqueous solution, wherein the mass fraction of the polymer aqueous solution is as follows: grafting initiator: distilled water =10:0.1: 100;
temperature-sensitive materials are mainly classified into three types: 1. macromolecules containing amide groups in the polymer chain, such as poly-N-isopropylacrylamide, poly-N-vinylcaprolactam, and poly-2-ethyl-2-oxazoline, specifically shown as a, b, and c in FIG. 2; 2. the polymer containing oxygen atoms in the main chain or side chain of the polymer, such as polymethacrylate, is shown in d and e in fig. 2; 3. the polymer containing phosphorus atoms in the polymer chain, such as poly-2-ethoxy-2-oxo-1, 3, 2-dioxaphospholane, is shown in detail in f in FIG. 2.
Thirdly, preparation of finished product
And uniformly coating the polymer aqueous solution on a laser-drilled breathable film, and drying by using a blast oven, wherein the oven degree is 75-85 ℃, and finally obtaining the high-breathability intelligent fresh packaging material.
Comparative example 1 Intelligent fresh food packaging material for realizing air permeability adjustment based on temperature sensitive material and preparation method thereof, comprising
Firstly, preparation of breathable film
Coating an adhesive on the surface of the strength layer with the thickness of 8-16um, drying the adhesive, melting the adhesive, attaching a heat sealing layer with the thickness of 52-68um, and cooling to obtain the composite material, wherein the adhesive is polyurethane glue, and the gluing amount is 1-3g/m 2; wherein, the strength layer is selected from one or more of biaxially oriented polyethylene, biaxially oriented polyamide and biaxially oriented polypropylene, the heat sealing layer is selected from at least one of blow molding polyethylene film and cast polypropylene film, the heat sealing layer is of a three-layer film blowing structure, and the layer thickness ratio is 1:2: 1;
and (3) carrying out laser punching treatment on the composite material on a rewinding machine provided with laser punching to obtain a laser punching breathable film, wherein the size of laser punching is 0.5-1.5um, and the punching density is 2-3/cm 2.
The intelligent fresh-keeping packaging material prepared by the invention and capable of realizing air permeability adjustment based on the temperature-sensitive material has better air permeability and has a larger relation with a polymer aqueous solution coated on the surface of a breathable film, and in order to verify the related technical scheme, the applicant performs the following tests:
comparative example 1: the steps of preparing the polymer aqueous solution and coating the polymer aqueous solution in example 1 are eliminated, and the relevant indexes of the prepared fresh packaging material are detected, and are specifically shown in table 1:
TABLE 1
Figure DEST_PATH_IMAGE002
As shown in table 1 and fig. 3, the air permeability of the fresh packaging material prepared in example 1 of the present invention gradually increases from low temperature to high temperature, and the change is obvious, while the fresh packaging material prepared in comparative example 1 has no change from low temperature to high temperature, so it can be seen that the polymer aqueous solution prepared by adding the temperature sensitive material in the present invention is an important factor affecting the air permeability of the fresh packaging material.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material is characterized by comprising a strength layer, a heat sealing layer and the temperature-sensitive material;
the strength layer is selected from one or more of biaxially oriented polyethylene, biaxially oriented polyamide and biaxially oriented polypropylene;
the heat sealing layer is selected from at least one of a blown polyethylene film and a cast polypropylene film, a modifier is blended in the heat sealing layer, and the modifier is selected from at least one of glycerol, epoxy resin and rosin resin;
the temperature-sensitive material comprises at least one of poly N-isopropyl acrylamide, poly N-vinyl caprolactam, poly 2-ethyl-2-oxazoline, polymethacrylate and poly 2-ethoxy-2-oxo-1, 3, 2-dioxaphospholane.
2. The intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material according to claim 1, characterized in that: the thickness of the strength layer is 8-16 um.
3. The intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material according to claim 1, characterized in that: the thickness of the heat sealing layer is 52-68 um.
4. The intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material according to claim 1, characterized in that: the heat sealing layer is of a three-layer film blowing structure, and the layer thickness ratio is 1:2: 1.
5. The preparation method of the intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material is characterized by comprising the intelligent fresh-keeping packaging material for realizing air permeability adjustment based on the temperature-sensitive material according to any one of claims 1 to 4, and the operation steps are as follows:
s1, coating an adhesive on the surface of the strength layer, drying the adhesive, melting the adhesive, attaching a heat sealing layer, and cooling to obtain a composite material;
s2, performing laser punching treatment on the composite material on a rewinder provided with laser punching to obtain a laser punching breathable film;
s3, adding the temperature-sensitive material and the grafting initiator into distilled water, stirring and dissolving to obtain a polymer aqueous solution;
s4, uniformly coating the polymer aqueous solution on a laser-drilled breathable film, and drying to obtain the high-breathability intelligent fresh packaging material.
6. The preparation method of the intelligent fresh-keeping packaging material based on the temperature-sensitive material for realizing air permeability adjustment according to claim 5, is characterized in that: in the S1, the adhesive is polyurethane glue, and the gluing amount is 1-3g/m 2.
7. The preparation method of the intelligent fresh-keeping packaging material based on the temperature-sensitive material for realizing air permeability adjustment according to claim 5, is characterized in that: in the S2, the size of laser drilling is 0.5-1.5um, and the drilling density is 2-3/cm 2.
8. The preparation method of the intelligent fresh-keeping packaging material based on the temperature-sensitive material for realizing air permeability adjustment according to claim 5, is characterized in that: in the S3, the grafting initiator is one or more selected from benzoyl peroxide, dicumyl peroxide and 2, 3-dimethyl 2, 3-diphenylbutane.
9. The preparation method of the intelligent fresh-keeping packaging material based on the temperature-sensitive material for realizing air permeability adjustment according to claim 5, is characterized in that: in the S3, the mass fraction of the polymer aqueous solution is as follows: grafting initiator: distilled water =10:0.1: 100.
10. The preparation method of the intelligent fresh-keeping packaging material based on the temperature-sensitive material for realizing air permeability adjustment according to claim 5, is characterized in that: and in the S4, drying the mixture by a blast oven, wherein the oven degree is 75-85 ℃.
CN202110978735.1A 2021-08-25 2021-08-25 Intelligent fresh-keeping packaging material for realizing air permeability adjustment based on temperature-sensitive material and preparation method thereof Pending CN113635637A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060269680A1 (en) * 2005-05-24 2006-11-30 Bennett Ronald G Method for creating and applying liquid-container barrier coating
CN106674576A (en) * 2017-01-04 2017-05-17 上海海洋大学 Fresh-keeping film with function of controlling respiration of fruits and vegetables and method for preparing fresh-keeping film

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060269680A1 (en) * 2005-05-24 2006-11-30 Bennett Ronald G Method for creating and applying liquid-container barrier coating
CN106674576A (en) * 2017-01-04 2017-05-17 上海海洋大学 Fresh-keeping film with function of controlling respiration of fruits and vegetables and method for preparing fresh-keeping film

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