CN107974867B - Composite packaging film and preparation method thereof - Google Patents

Composite packaging film and preparation method thereof Download PDF

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CN107974867B
CN107974867B CN201711156112.6A CN201711156112A CN107974867B CN 107974867 B CN107974867 B CN 107974867B CN 201711156112 A CN201711156112 A CN 201711156112A CN 107974867 B CN107974867 B CN 107974867B
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phase change
layer
paper base
composite packaging
packaging film
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CN107974867A (en
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李志明
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Guangdong baojiali New Material Co.,Ltd.
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Guangdong Baojiali Green Printing Co ltd
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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
    • D21H19/02—Metal coatings
    • 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
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline 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
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • 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
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • 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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wrappers (AREA)
  • Packages (AREA)

Abstract

The invention provides a composite packaging film and a preparation method thereof, and relates to the technical field of low-temperature packaging to slow down the melting speed of ice cream at a higher room temperature. The preparation method of the composite packaging film comprises the following steps: forming an electroplated aluminum layer on the upper surface of the paper base layer, and forming a phase change heat absorption layer on the surface of the electroplated aluminum layer, which is far away from the paper base layer; and a protective film is wrapped outside the paper base layer with the electroplated aluminum layer and the phase change heat absorption layer. The composite packaging film is prepared by adopting the preparation method of the composite packaging film. The composite packaging film and the preparation method thereof provided by the invention are used for packaging low-temperature preserved food.

Description

Composite packaging film and preparation method thereof
Technical Field
The invention relates to the technical field of low-temperature packaging, in particular to a composite packaging film and a preparation method thereof.
Background
The ice cream is a summer heat-relieving food which is widely popular among consumers. At present, the ice cream is generally packaged by adopting a paper-based composite film material, and a consumer only needs to tear a packaging bag made of the composite film when tasting the ice cream.
Chinese patent ZL03226653.7 discloses a paper-plastic composite structure, which comprises a paper layer and a plastic film layer hot-pressed and laminated on the paper layer, wherein the plastic film layer can be directly laminated on the surface of the paper layer through a biaxially stretched polypropylene non-adhesive composite film. Although the structure can be used for compounding the plastic film layer on the surface of the paper layer without using an adhesive, the problem which cannot be ignored exists when the material of the paper-plastic composite structure is made into the ice cream packaging bag. For example: after people take ice cream out of the refrigerator, the ice cream cannot be eaten immediately for some reason, which makes the ice cream melt rapidly often at a higher room temperature.
Disclosure of Invention
The invention aims to provide a composite packaging film and a preparation method thereof, which are used for slowing down the melting speed of ice cream at higher room temperature.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of making a composite packaging film, comprising:
firstly, forming an electroplated aluminum layer on the upper surface of a paper base layer;
secondly, forming a phase change heat absorption layer on the surface of the electroplated aluminum layer, which is far away from the paper base layer;
and thirdly, wrapping a protective film outside the paper base layer with the electroplated aluminum layer and the phase change heat absorption layer.
Compared with the prior art, in the preparation method of the composite packaging film provided by the invention, the upper surface of the paper base layer forms the electroplated aluminum layer, and the surface of the electroplated aluminum layer, which is far away from the paper base layer, forms the phase change heat absorption layer. And the paper base layer formed with the electroplated aluminum layer and the phase change heat absorption layer is wrapped with a layer of protective film, so that the phase change heat absorption layer can be packaged by the layer of protective film, and the phase change heat absorption layer can be better combined with the electroplated aluminum layer. At the same time. The protective film can also protect the surface of the paper base layer, which is far away from the electroplated aluminum layer, from being in direct contact with ice cream, so that the ice cream is prevented from being adhered to the paper base layer at low temperature.
The invention also provides a composite packaging film, which comprises a paper base layer and an electroplated aluminum layer formed on the upper surface of the paper base layer; and a phase change heat absorption layer is formed on the surface of the electroplated aluminum layer, which is far away from the paper base layer, and a protective film is wrapped outside the paper base layer on which the electroplated aluminum layer and the phase change heat absorption layer are formed.
Compared with the prior art, the beneficial effect of the composite packaging film provided by the invention is the same as that of the preparation method of the composite packaging film provided by the technical scheme, and the details are not repeated herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for preparing a composite packaging film according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating the formation of a phase change heat sink layer on the surface of the electroplated aluminum layer facing away from the paper substrate in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of wrapping a protective film on the paper substrate with an electroplated aluminum layer and a phase change heat absorbing layer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a composite packaging film provided in an embodiment of 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.
As shown in fig. 1 and 4, an embodiment of the present invention provides a method for preparing a composite packaging film, including the following steps:
firstly, forming an electroplated aluminum layer 2 on the upper surface of a paper base layer 1;
secondly, forming a phase change heat absorption layer 3 on the surface of the electroplated aluminum layer 2, which is far away from the paper base layer 1;
and thirdly, wrapping a protective film 4 outside the paper base layer on which the electroplated aluminum layer 2 and the phase change heat absorption layer 3 are formed.
Based on the preparation method of the composite packaging film, the upper surface of the paper base layer 1 forms the electroplated aluminum layer 2, and the surface of the electroplated aluminum layer 2 departing from the paper base layer 1 forms the phase change heat absorption layer 3, when the ice cream is packaged by adopting the composite packaging film, if the ice cream is taken out from the refrigeration equipment and then is placed in a higher environment at room temperature for a period of time, the phase change heat absorption layer 3 can absorb the heat around, so that the temperature of the microenvironment where the ice cream is located is reduced, and the melting speed of the ice cream at the higher room temperature can be slowed down. And the paper base layer 1 formed with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 is wrapped with a protective film 4, so that the phase change heat absorption layer 3 can be encapsulated by the protective film 4, and the phase change heat absorption layer 3 can be better combined with the electroplated aluminum layer 2. At the same time. The protective film 4 can also protect the surface of the paper base layer 1 facing away from the electroplated aluminum layer 2 (i.e., the lower surface of the paper base layer 1) from direct contact with ice cream to prevent adhesion of the ice cream 2 to the paper base layer 1 at low temperature.
Although the phase change heat absorbing layer emits heat under the condition that the ambient temperature is particularly cold, the low-temperature environment provided by the refrigerating equipment is relatively continuous when the ice cream is stored in the refrigerating equipment, and although the phase change heat absorbing layer 3 is formed in the composite packaging film, the heat emitting capacity of the composite packaging film under the low-temperature environment is limited, and the storage of the ice cream is not influenced. In addition, when the ambient temperature is higher, the phase change heat absorption layer 3 absorbs the heat around, so that the temperature of the electroplated aluminum layer in contact with the phase change heat absorption layer is reduced, and the electroplated aluminum layer can well transfer the cold energy to the paper base layer, thereby further slowing down the melting of the ice cream in the environment with higher room temperature.
In the second step, as shown in fig. 2 and 4, the specific process of forming the phase change heat absorbing layer 3 on the surface of the electroplated aluminum layer 1 away from the paper base layer 1 is as follows:
step S210: dispersing methyl methacrylate, a phase change material and sodium dodecyl benzene sulfonate into water, and mixing and stirring to form emulsion; wherein the mass ratio of the methyl methacrylate to the phase change material to the dodecylbenzene sulfonic acid is (3-5) to 1: 0.2; the solid content of the emulsion is 50-70 percent; the phase-change material is generally liquid paraffin and can also be other phase-change materials with better heat storage effect;
step S220: adding an initiator solution with the mass concentration of 0.4-0.8% into the emulsion, and then reacting for 10-15 min under the condition of microwave heating at 50-70 ℃ to obtain a phase change reaction system; the mass ratio of the initiator in the initiator solution to the methyl methacrylate is 1 (100-150); the initiator is one or more of ammonium persulfate, potassium persulfate and azobisisobutyronitrile;
step S230: carrying out post-treatment on the phase change reaction system to obtain a nano phase change capsule;
for example, a demulsification method is generally adopted to carry out aftertreatment on a phase change reaction system, and the specific method is as follows: and adding saturated salt water into the phase change reaction system to demulsify the phase change reaction system, centrifuging to separate the demulsified phase change reaction system into an upper layer emulsion and a lower layer clear liquid, collecting the upper layer emulsion, washing the upper layer emulsion for multiple times by using saturated sodium carbonate, and drying to obtain the nano phase change capsule.
Step S240: according to the following steps of 100: (10-30) mixing the nano phase change capsules with edible glue according to the mass ratio, and then coating the mixture on the surface of the electroplated aluminum layer 2, which is far away from the paper base layer 1, to obtain a phase change heat absorption layer 3; the edible gum can be one or more of carrageenan, acacia and gelatin.
From the above description of the specific forming process of the phase change heat absorbing layer 3, it can be found that the phase change heat absorbing layer 3 is substantially formed by mixing nano phase change capsules with edible glue and then coating the mixture on the surface of the electroplated aluminum layer 2 away from the paper base layer 1, and therefore the phase change heat absorbing layer 3 can be stably formed on the surface of the electroplated aluminum layer 2 away from the paper base layer 1 because the edible glue is contained therein, and not only the nano phase change capsules can be adhered together by the edible glue, but also the nano phase change capsules can be adhered on the surface of the electroplated aluminum layer 2 away from the paper base layer 1. Moreover, as the raw materials used by the edible glue are harmless to human bodies, even if the nano phase change capsules are adhered together by using the gluing process in the embodiment of the invention, the nano phase change capsules are harmless to human bodies.
In addition, in the process of manufacturing the nano phase change capsule, in the embodiment of the invention, the methyl methacrylate and the phase change material are emulsified by sodium dodecyl benzene sulfonate, and the initiator is added into the formed emulsion, so that the methyl methacrylate is subjected to a polymerization reaction under a microwave heating condition, a polymethyl methacrylate network structure is formed, and the phase change material is wrapped in the polymethyl methacrylate network structure. It is worth noting that the prior art adopts a common heating method when preparing the nano phase change capsule, while the embodiment of the invention adopts a microwave heating method when preparing the nano phase change capsule, so that not only the reaction temperature is reduced under the microwave effect, but also the mass ratio of the initiator in the initiator solution to the methyl methacrylate is 1 (100-150), the initiation of the polymerization reaction can be realized, and the reaction time is greatly shortened.
The condition parameters of comparative examples and examples for preparing 200nm nano phase change capsules are given in table 1, wherein the comparative examples one to three adopt a conventional heating method, and the examples adopt a microwave heating method; wherein the initiators are all azodiisobutyronitrile
TABLE 1 Condition parameters for preparing Nano phase Change capsules
Figure 576657DEST_PATH_IMAGE002
As can be seen from Table 1, when the nano phase change capsules are prepared by the microwave heating method, the addition amount of the initiator can be reduced, the reaction temperature can be reduced, and the reaction time can be shortened.
In order to more stably enable the phase change material to be formed on the electroplated aluminum layer, the protective film can be limited to be a phenolic resin film, so that the phase change material can be sealed by the phenolic resin, and moreover, the phenolic resin has good water resistance, and the phenolic resin is wrapped outside the paper base layer formed with the electroplated aluminum layer and the phase change heat absorption layer in a film mode, so that the composite packaging film is more suitable for a high-humidity environment in refrigeration equipment.
In the third step, as shown in fig. 3 and 4, the specific steps of wrapping a protective film 4 on the paper base layer 1 on which the electroplated aluminum layer 2 and the phase change heat absorbing layer 3 are formed are as follows:
s310: dissolving phenolic resin in ethanol to obtain an ethanol solution of the phenolic resin, wherein the mass concentration of the ethanol solution of the phenolic resin is 30-40%;
s320: and (3) immersing the paper base layer 1 with the phase change heat absorption layer 3 and the electroplated aluminum layer 2 into an ethanol solution of phenolic resin, standing for 30-48 min, taking out and drying to enable the paper base layer with the phase change heat absorption layer and the electroplated aluminum layer to be wrapped by the phenolic resin layer, wherein the phenolic resin film is a protective film 4.
Further, as shown in fig. 1 and 4, in order to further improve the applicability of the composite packaging film, after the paper base layer 1 on which the electroplated aluminum layer 3 and the phase change heat absorption layer 3 are formed is wrapped with a protective film 4, chitosan is dissolved in dilute hydrochloric acid with the mass concentration of 0.2% -0.7%, then a chitosan film 5 is formed on the surface of the protective film 4 by using a spin coating method, the chitosan is an edible healthy material and has good film forming property and cohesiveness, after the chitosan film 5 is formed on the surface of the protective film 4 by using the spin coating method, the chitosan film 5 can be firmly attached to the surface of the protective film 4 to further encapsulate the phase change material, and when ice cream is packaged by using the composite packaging film, the ice cream is in direct contact with the chitosan film 5, and no harmful component is introduced into the ice cream.
As can be seen from the above description of the method for manufacturing a composite packaging film, the structure of the composite packaging film manufactured by the embodiment of the present invention is shown in fig. 4, and includes a paper base layer 1, and an electroplated aluminum layer 2 formed on the upper surface of the paper base layer 1; the surface of the electroplated aluminum layer 2, which is far away from the paper base layer 1, is provided with a phase change heat absorption layer 3, and the paper base layer 1 which is provided with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 is wrapped with a protective film 4.
Compared with the prior art, the beneficial effects of the composite packaging film provided by the embodiment of the invention are the same as those of the preparation method of the composite packaging film provided by the technical scheme, and are not repeated herein.
Illustratively, as shown in fig. 1 to 4, the material of the phase change heat absorbing layer 3 includes 100: (10-30) mixing the nano phase change capsule with edible gum according to the mass ratio. The protective film is a phenolic resin film, and a chitosan film 5 is formed outside the phenolic resin film.
In order to more clearly illustrate the method for preparing the composite packaging film provided by the embodiment of the present invention, several specific examples are given below in conjunction with fig. 1-4.
Example one
The preparation method of the composite packaging film provided by the embodiment of the invention comprises the following steps:
firstly, forming an electroplated aluminum layer 2 on the upper surface of a paper base layer 1;
secondly, dispersing methyl methacrylate, liquid paraffin and sodium dodecyl benzene sulfonate into water, and mixing and stirring the mixture to form emulsion; wherein the mass ratio of the methyl methacrylate to the liquid paraffin to the dodecylbenzene sulfonic acid is 3:1: 0.2; the solid content of the emulsion is 60 percent;
adding a potassium persulfate aqueous solution with the mass concentration of 0.4% into the emulsion, and then reacting for 15min under the condition of microwave heating at 50 ℃ to obtain a phase change reaction system; the mass ratio of the potassium persulfate in the potassium persulfate aqueous solution to the methyl methacrylate is 1: 100;
adding saturated salt water into the phase change reaction system to demulsify the phase change reaction system, centrifuging to separate the demulsified phase change reaction system into an upper layer emulsion and a lower layer clear liquid, collecting the upper layer emulsion, washing the upper layer emulsion for multiple times by using saturated sodium carbonate, and drying to obtain a nano phase change capsule;
according to the following steps of 100: 10, mixing the nano phase change capsules and gelatin together, and coating the mixture on the surface of the electroplated aluminum layer 2, which is far away from the paper base layer 1, to obtain the phase change heat absorption layer 3.
Dissolving phenolic resin in ethanol to obtain an ethanol solution of the phenolic resin, wherein the mass concentration of the ethanol solution of the phenolic resin is 30%;
immersing the paper base layer 1 with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 into an ethanol solution of phenolic resin, standing for 48min, taking out and drying to enable the paper base layer 1 with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 to be wrapped by the phenolic resin layer, wherein the phenolic resin film is a protective film 4;
fourthly, dissolving chitosan in dilute hydrochloric acid with the mass concentration of 0.7%, and then forming a chitosan film 5 on the surface of the protective film 4 by using a spin coating method.
Example two
The preparation method of the composite packaging film provided by the embodiment of the invention comprises the following steps:
firstly, forming an electroplated aluminum layer 2 on the upper surface of a paper base layer 1;
secondly, dispersing methyl methacrylate, liquid paraffin and sodium dodecyl benzene sulfonate into water, and mixing and stirring the mixture to form emulsion; wherein the mass ratio of the methyl methacrylate to the liquid paraffin to the dodecylbenzene sulfonic acid is 4:1: 0.2; the solid content of the emulsion was 70%;
adding azodiisobutyronitrile aqueous solution with the mass concentration of 0.8% into the emulsion, and then reacting for 10min under the condition of microwave heating at 70 ℃ to obtain a phase change reaction system; the mass ratio of the azodiisobutyronitrile to the methyl methacrylate in the azodiisobutyronitrile aqueous solution is 1: 150;
adding saturated salt water into the phase change reaction system to demulsify the phase change reaction system, centrifuging to separate the demulsified phase change reaction system into an upper layer emulsion and a lower layer clear liquid, collecting the upper layer emulsion, washing the upper layer emulsion for multiple times by using saturated sodium carbonate, and drying to obtain a nano phase change capsule;
according to the following steps of 100: 30, mixing the nano phase change capsules with Arabic gum, and then coating the mixture on the surface of the electroplated aluminum layer 2, which is far away from the paper base layer 1, by scraping to obtain the phase change heat absorption layer 3.
Dissolving phenolic resin in ethanol to obtain an ethanol solution of the phenolic resin, wherein the mass concentration of the ethanol solution of the phenolic resin is 40%;
immersing the paper base layer 1 with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 into an ethanol solution of phenolic resin, standing for 30min, taking out and drying to enable the paper base layer 1 with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 to be wrapped by the phenolic resin layer, wherein the phenolic resin film is a protective film 4;
fourthly, dissolving chitosan in dilute hydrochloric acid with the mass concentration of 0.2%, and then forming a chitosan film 5 on the surface of the protective film 4 by using a spin coating method.
EXAMPLE III
The preparation method of the composite packaging film provided by the embodiment of the invention comprises the following steps:
firstly, forming an electroplated aluminum layer 2 on the upper surface of a paper base layer 1;
secondly, dispersing methyl methacrylate, liquid paraffin and sodium dodecyl benzene sulfonate into water, and mixing and stirring the mixture to form emulsion; wherein the mass ratio of the methyl methacrylate to the liquid paraffin to the dodecylbenzene sulfonic acid is 5:1: 0.2; the solid content of the emulsion is 50 percent;
adding a mixed aqueous solution of ammonium persulfate and azobisisobutyronitrile with the mass concentration of 0.5% into the emulsion, and then reacting for 12min under the condition of microwave heating at 58 ℃ to obtain a phase change reaction system; the mass ratio of the total mass of the ammonium persulfate and the azobisisobutyronitrile to the methyl methacrylate in the mixed aqueous solution of the ammonium persulfate and the azobisisobutyronitrile is 1: 120;
adding saturated salt water into the phase change reaction system to demulsify the phase change reaction system, centrifuging to separate the demulsified phase change reaction system into an upper layer emulsion and a lower layer clear liquid, collecting the upper layer emulsion, washing the upper layer emulsion for multiple times by using saturated sodium carbonate, and drying to obtain a nano phase change capsule;
according to the following steps of 100: 10: 10, mixing the nano phase change capsules, the arabic gum and the carrageenan together, and then coating the mixture on the surface of the electroplated aluminum layer 2, which is far away from the paper base layer 1, by scraping to obtain the phase change heat absorption layer 3.
Dissolving phenolic resin in ethanol to obtain an ethanol solution of the phenolic resin, wherein the mass concentration of the ethanol solution of the phenolic resin is 35%;
immersing the paper base layer 1 with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 into an ethanol solution of phenolic resin, standing for 40min, taking out and drying to enable the paper base layer 1 with the electroplated aluminum layer 2 and the phase change heat absorption layer 3 to be wrapped by the phenolic resin layer, wherein the phenolic resin film is a protective film 4;
the fourth step is to dissolve chitosan in dilute hydrochloric acid having a mass concentration of 0.5%, and then to form a chitosan film 5 on the surface of the protective film 4 by spin coating.
Comparative example No. two
The preparation method of the composite packaging film provided by the comparative example II comprises the following steps:
firstly, forming an electroplated aluminum layer 2 on the upper surface of a paper base layer 1;
secondly, forming a polymethyl methacrylate film layer on the electroplated aluminum layer 2;
thirdly, coating a phenolic resin film on the polymethyl methacrylate film layer;
the fourth step is to form a chitosan film 5 on the surface of the protective film 4 by spin coating.
Firstly, packaging and packaging ice cubes by using the composite packaging film prepared in the second embodiment and the composite packaging film prepared in the second comparative embodiment, refrigerating at-10 ℃ for 2 hours, taking out the ice cubes, standing at 36 ℃ for 2min, 5min and 10min, and collecting molten water for 2min, 5min and 10 min; the specific test results are shown in Table 2.
TABLE 2 second and comparative examples melt test results
Time of day 2min 5min 10min
Volume of V1 V2 V3
Example two 0.4mL 0.6mL 0.6mL
Comparative example No. two 2mL 4mL 8mL
As can be seen from table 2, the ice cubes packaged by the composite packaging film prepared in the example of the present invention hardly melt within 10min after being taken out from the refrigeration equipment, while the ice cubes packaged by the composite packaging film prepared in the comparative example hardly melt within 10min after being taken out from the refrigeration equipment, whereas the phase change heat absorbing layer 3 is not used in the comparative example, as can be seen from the comparative example and the comparative example, so that the composite packaging film prepared in the comparative example has a poor heat insulating effect, while the ice cubes packaged in the example can hardly melt at a high room temperature.
It should be noted that after the ice cream is taken out of the refrigerator by the ordinary consumer, the ice cream is not returned to the refrigerator if it is eaten within several minutes, so that the melting test is performed in the embodiment of the present invention for a maximum time of 10 min.
Second, the water vapor transmission performance of the composite packaging films prepared in the first to third examples was tested, and the specific results are shown in table 3. Wherein, the water vapor transmission rate test refers to GB/T1037-1988 cup method for testing the water vapor permeability of plastic films and sheets;
table 3 composite packaging films of examples one to three each test performance data
Figure 962638DEST_PATH_IMAGE003
From table 3, it can be found that the composite packaging film prepared by the preparation method of the composite packaging film provided by the embodiment of the invention meets the national sanitary standard of composite films, has good water vapor isolation, and is suitable for low-temperature and high-humidity environments.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. A method of making a composite packaging film for use in refrigerating a food product, the composite packaging film comprising:
firstly, forming an electroplated aluminum layer on the upper surface of a paper base layer;
secondly, forming a phase change heat absorption layer on the surface of the electroplated aluminum layer, which is far away from the paper base layer;
step three, wrapping a layer of protective film outside the paper base layer with the electroplated aluminum layer and the phase change heat absorption layer;
the forming of the phase change heat absorption layer on the surface of the electroplated aluminum layer, which is far away from the paper base layer, comprises the following steps:
dispersing methyl methacrylate, a phase change material and sodium dodecyl benzene sulfonate into water, and mixing and stirring to form emulsion; wherein the mass ratio of the methyl methacrylate to the phase change material to the dodecylbenzene sulfonic acid is (3-5) to 1: 0.2;
adding an initiator solution with the mass concentration of 0.4-0.8% into the emulsion, and then reacting for 10-15 min under the condition of microwave heating at 50-70 ℃ to obtain a phase change reaction system; the mass ratio of the initiator to the methyl methacrylate in the initiator solution is 1 (100-150);
carrying out post-treatment on the phase change reaction system to obtain a nano phase change capsule;
according to the following steps of 100: (10-30) mixing the nano phase change capsules with edible glue, and coating the mixture on the surface of the electroplated aluminum layer, which is far away from the paper base layer, so as to obtain the phase change heat absorption layer.
2. The preparation method of the composite packaging film according to claim 1, wherein the initiator is one or more of ammonium persulfate, potassium persulfate and azobisisobutyronitrile; the edible gum is one or more of carrageenan, arabic gum and gelatin.
3. The method of manufacturing a composite packaging film according to claim 1, wherein the phase change material is liquid paraffin.
4. The method for preparing the composite packaging film according to claim 1, wherein the post-treating the phase change reaction system comprises:
and adding saturated salt water into the phase change reaction system to demulsify the phase change reaction system, centrifuging to separate the demulsified phase change reaction system into an upper layer emulsion and a lower layer clear liquid, collecting the upper layer emulsion, washing the upper layer emulsion for multiple times by using saturated sodium carbonate, and drying to obtain the nano phase change capsule.
5. The method for preparing a composite packaging film according to claim 1, wherein the wrapping of the paper base layer on which the electroplated aluminum layer and the phase change heat absorbing layer are formed with a protective film comprises:
dissolving phenolic resin in ethanol to obtain an ethanol solution of the phenolic resin, wherein the mass concentration of the ethanol solution of the phenolic resin is 30-40%;
and (3) immersing the paper base layer with the electroplated aluminum layer and the phase change heat absorption layer into an ethanol solution of phenolic resin, standing for 30-48 min, taking out and drying to enable the paper base layer with the electroplated aluminum layer and the phase change heat absorption layer to be wrapped by the phenolic resin layer, wherein the phenolic resin film is a protective film.
6. The method for preparing a composite packaging film according to claim 1 or 5, wherein after wrapping a protective film on the paper base layer on which the electroplated aluminum layer and the phase change heat absorbing layer are formed, the method further comprises:
dissolving chitosan in dilute hydrochloric acid with the mass concentration of 0.2-0.7%, and forming a chitosan film on the surface of the protective film by adopting a spin coating method.
7. A composite packaging film, which is prepared by the method for preparing the composite packaging film according to any one of claims 1 to 6, and is used for refrigerating food, wherein the composite packaging film comprises a paper base layer and an electroplated aluminum layer formed on the upper surface of the paper base layer; and a phase change heat absorption layer is formed on the surface of the electroplated aluminum layer, which is far away from the paper base layer, and a protective film is wrapped outside the paper base layer on which the electroplated aluminum layer and the phase change heat absorption layer are formed.
8. The composite packaging film of claim 7, wherein the material of the phase change heat absorbing layer comprises 100: (10-30) mixing the nano phase change capsule with edible gum according to the mass ratio.
9. The composite packaging film according to claim 7, wherein the protective film is a phenolic resin film, and a chitosan film is further formed on the phenolic resin film.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203510864U (en) * 2013-10-11 2014-04-02 浙江海川安全防护用品有限公司 Solar cooker light-emitting film with acrylic surface layer
CN105586010A (en) * 2014-10-21 2016-05-18 中国科学院深圳先进技术研究院 Preparation method of nano-encapsulated phase change material

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Publication number Priority date Publication date Assignee Title
WO2015176178A1 (en) * 2014-05-14 2015-11-26 Bioastra Technologies, Inc. Thermoregulatory coatings for paper

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203510864U (en) * 2013-10-11 2014-04-02 浙江海川安全防护用品有限公司 Solar cooker light-emitting film with acrylic surface layer
CN105586010A (en) * 2014-10-21 2016-05-18 中国科学院深圳先进技术研究院 Preparation method of nano-encapsulated phase change material

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