CN112659707A - Easy-to-tear food packaging cover film and preparation method thereof - Google Patents
Easy-to-tear food packaging cover film and preparation method thereof Download PDFInfo
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Abstract
The application relates to the field of polymer composite materials, in particular to an easy-to-tear food packaging cover film and a preparation method thereof. An easy-to-tear food packaging cover film comprises a printing layer, a barrier layer and an inner layer; the inner layer comprises a corona layer, a middle layer, a binding layer and a heat sealing layer, and the corona layer is compounded on the upper surface of the barrier layer; the middle layer is compounded on the upper surface of the corona layer; the bonding layer is compounded on the upper surface of the middle layer; the heat sealing layer is compounded on the upper surface of the bonding layer. This application has and does not turn white with the involution of PP cup, realizes and interface separation at 5N 15 mm's invariable effort, and this application epiphragma is uncovered and is not turned white to have no residue, and the vestige is smooth, and it is not damaged and the separation effect is better to take off the membrane surface. The preparation method comprises the steps of firstly preparing the inner layer, then forming the aluminum-plated layer on the printing layer through vacuum evaporation, then coating the self-healing polyurethane resin on the aluminum-plated layer to compound the inner layer and the self-healing polyurethane layer, cooling and cutting to obtain the covering film. The method has the advantages of technical parameter temperature and simple operation, and is convenient for industrial popularization and production.
Description
Technical Field
The application relates to the field of polymer composite materials, in particular to an easy-to-tear food packaging cover film and a preparation method thereof.
Background
The easy-to-tear film material is widely used for various packages, such as various packaging bags directly processed by the easy-to-tear film material, or cover films for bowl-shaped, cup-shaped, barrel-shaped and box-shaped containers made of PP materials. The heat sealing strength of the common polypropylene cover film is increased along with the rise of the heat sealing temperature, and when the container is sealed firmly, the cover film cannot be uncovered, which brings great inconvenience to the use. In order to design the easy-to-open cover film of the container, the cover film is required to be capable of sealing the container, namely the cover film has certain heat sealing strength, the container is sealed by the material and can not be exposed or fried under the conditions of cooking, refrigeration, transportation and the like, and the container can be easily opened by artificially applying a proper external force.
When the prior cover film for bowl-shaped, cup-shaped, barrel-shaped and box-shaped containers made of PP materials is uncovered, the following problems are found: the uncovered part is whitish, no residue exists, the trace is rough, and the surface of the uncovered film is damaged. When the surface of the uncovering film is damaged, the damaged part of the film is easy to tear and remains on the container, so that the covering film is not easy to be completely uncovered.
Disclosure of Invention
In order to solve the problem that the existing cover film is remained after being uncovered, the application aims to provide the food packaging cover film easy to uncover and the preparation method thereof.
In a first aspect, the application provides an easy-to-tear food packaging cover film, which adopts the following technical scheme: an easy-to-tear food packaging cover film comprises a printing layer, wherein a barrier layer is compounded on the upper surface of the printing layer; the upper surface of the barrier layer is compounded with an inner layer; the inner layer comprises a corona layer, a middle layer, a binding layer and a heat sealing layer, and the corona layer is compounded on the upper surface of the barrier layer; the middle layer is compounded on the upper surface of the corona layer; the bonding layer is compounded on the upper surface of the middle layer; the heat sealing layer is compounded on the upper surface of the bonding layer.
By adopting the technical scheme, the printing layer is made of the PET material, and the printing ink patterns can be printed according to the requirements of customers; the barrier layer can play a better barrier role; the corona layer enables the barrier layer and the inner layer to be tightly combined; the intermediate layer and the heat sealing layer are tightly combined by the binding layer, so that the heat sealing layer and the binding layer are prevented from falling off when the cover film is uncovered; the heat-seal layer guarantees that can use the invariable effort to reveal the epiphragma, to sum up, this application epiphragma is revealed and is not whitened no residue, and the vestige is smooth, and it does not have damaged and the effectual effect of separation to reveal the membrane surface.
Preferably, the bonding layer is made of raw materials with the following weight percentages: 20-30% of metallocene polypropylene, 20-30% of metallocene polyethylene and 30-60% of butene ternary copolymer polypropylene.
Through adopting above-mentioned technical scheme, the anchor coat guarantees heat-seal layer and intermediate level bonding strength, avoids appearing the interlaminar and peels off, and this application epiphragma is uncovered the back, and the vestige is smooth, and it is not damaged to uncover the membrane surface.
Preferably, the heat sealing layer is prepared from the following raw materials in percentage by weight: 20-30% of LDPE, 60-80% of TAFMER and the balance of additives.
Through adopting above-mentioned technical scheme, guarantee that epiphragma heat-seal strength is invariable.
Preferably, the intermediate layer is prepared from homopolymerized polypropylene; the corona layer is prepared from ethylene and propylene binary copolymer.
Preferably, the additive comprises 0.1-0.5% of slipping agent and 0.5-5.0% of bactericide.
By adopting the technical scheme, the cover film is endowed with antibacterial property and smoothness.
Preferably, the slipping agent is one or more of microbead erucamide, oleamide and YY-5031 modifier; the bactericide is antibacterial master batch which is prepared from the following raw materials in percentage by weight: 10-25% of silver ion antibacterial agent, 15-25% of LDPE and the balance of TAFMER.
Preferably, the barrier layer comprises an aluminum-plated layer evaporated on the printing layer and a self-healing polyurethane layer compounded with the aluminum-plated layer.
Through adopting above-mentioned technical scheme, given the function that the epiphragma can heal up by oneself, this application wholly has better healing effect, and the separation is better.
Preferably, the self-healing polyurethane layer is polymerized by a component A and a component B; 100 parts of polyether polyol with the molecular weight of 2000, 0.5 part of pentaerythritol diphosphite diisodecyl ester, 1.2 parts of foam homogenizing agent, 2.0 parts of polyether modified polysiloxane, 1.2 parts of polyurethane type high molecular dispersing agent, 5 parts of 1, 5-pentanediol and 0.2 part of bismuth octyldecanoate; the component B is prepared from the following raw materials in parts by weight: 100 parts of polyether polyol PTMEG with the molecular weight of 2000, 80 parts of MDI-50, 120 parts of MDI isocyanate, 20 parts of dimethylglyoxime and 100 parts of acetone.
Through adopting above-mentioned technical scheme, self-healing polyurethane layer can heal by oneself, has given the tectorial membrane function that can heal by oneself, and this application is whole to have better healing effect, and the separation is better.
In a second aspect, the application provides a preparation method of an easy-to-tear food packaging cover film, which adopts the following technical scheme:
a preparation method of an easy-to-tear food packaging cover film is characterized by comprising the following steps: the method comprises the following steps:
step 1, preparing an inner layer, weighing the ingredients of the corona layer, the middle layer, the binding layer and the heat sealing layer according to the proportion, respectively putting the ingredients into a multi-screw co-extruder, wherein the extrusion temperature is divided into six zones, namely 180 ℃, 190 ℃, 195 ℃, 225 ℃ and 225 ℃, and the extrusion grinding tool head temperature is 240 ℃ to obtain the inner layer;
step 2, forming an aluminum-plated barrier layer on the printing layer by vacuum evaporation to obtain a prefabricated printing layer;
and 3, coating self-healing polyurethane resin on the prefabricated printing layer in the step 2 to form a self-healing polyurethane layer, compounding the inner layer and the self-healing polyurethane layer, cooling and cutting to obtain the covering film.
By adopting the technical scheme, the preparation method is simple and is convenient for industrial popularization and production.
Preferably, before the step 3, a self-healing polyurethane tree is prepared, wherein the self-healing polyurethane tree is prepared from a component A and a component B; wherein, the component A is prepared by the following steps: weighing polyether polyol with the molecular weight of 2000, pentaerythritol diphosphite, diisodecyl ester, a foam stabilizer, polyether modified polysiloxane, a polyurethane type polymeric dispersant and bismuth octodecanoate according to the proportion of the component A, stirring and mixing for 1-2 hours at 76.5 ℃, adding 1, 5-pentanediol with accurate measurement, and stirring and mixing for 2-3 hours; preparing a component B, weighing dimethylglyoxime and acetone according to the proportion of the component B to dissolve the dimethylglyoxime in the acetone, weighing polyether polyol with the molecular weight of 2000, MDI-50 and MDI isocyanate according to the proportion of the component B, stirring and mixing for 1-2 hours at 80 ℃, adding dimethylglyoxime dissolved in the acetone, heating to 80 ℃, removing the acetone, and stirring and mixing for 2-3 hours; the prepared component A and the component B are mixed according to the weight ratio of 1: 1, stirring and mixing for 5-15 min at the mixing temperature of 20-30 ℃ and the rotating speed of 800-1200 r/min, and obtaining the cured polyurethane resin.
Through adopting above-mentioned technical scheme, self-healing polyurethane layer can heal by oneself, has given the tectorial membrane function that can heal by oneself, and this application is whole to have better healing effect, and the separation is better.
In summary, the present application has the following advantages:
1. the method has the effects of no whitening and residue after uncovering, smooth trace and no damage on the surface of the uncovered film.
2. This application epiphragma can heal up by oneself, has better healing effect, and the separation is better.
3. The preparation method is simple and convenient for industrial popularization and production.
Drawings
Fig. 1 is a schematic view of the overall structure of embodiment 1 in the present application.
In the figure, 1, a printing layer; 2. a barrier layer; 21. plating an aluminum barrier layer; 22. self-healing polyurethane layer; 3. an inner layer; 4. a corona layer; 5. an intermediate layer; 6. a bonding layer; 7. and (4) heat sealing the layer.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples.
Raw materials
Preparation example
Preparation example 1
Preparing the antibacterial master batch: weighing 5kg of silver ion antibacterial agent, 5kg of LDPE and 15kg of TAFMER according to the proportion, and extruding and granulating by using a single-screw extruder, wherein the extrusion temperature is divided into four zones, the temperature of the first zone is 160 ℃, the temperature of the second zone is 175 ℃, the temperature of the third zone is 190 ℃, and the temperature of the fourth zone is 200 ℃ to obtain the antibacterial master batch.
Preparation example 2
The preparation method of the self-healing polyurethane tree comprises the following steps:
step 1: preparation of component A, 25.0kg of polyether polyol (purchased from Dowsun USA) with molecular weight of 2000, 0.125kg of pentaerythritol diphosphite diisodecyl phosphite (Guangzhou Zhi Chemical Co., Ltd.), 0.3kg of foam homogenizing agent (Nantong Tokutai Chemical Co., Ltd.), 0.5kg of polyether modified polysiloxane (brand KMT, CAS 0875678), 0.3kg of polyurethane type polymeric dispersant (Changsonier Chemical Co., Ltd.), 0.05kg of bismuth octyldecanoate (The Shepherd Chemical Company of The leading Chemical Co., USA) were weighed according to The proportion of component A, stirred and mixed for 1 hour at 76.5 ℃, 1, 5-pentanediol (Nippon Coli Co., Ltd.) with accurate metering of 1.25kg was added, and stirred and mixed for 3 hours at The rotation speed of 800 r/min.
Step 2, preparation of component B:
and 2.1, weighing 5kg of dimethylglyoxime (Nanjing chemical reagent Co., Ltd.) and 25kg of acetone (Shanghai Endian chemical Co., Ltd.) according to the proportion of the component B, and stirring to dissolve the dimethylglyoxime in the acetone.
Step 2.2, weighing 25kg of polyether polyol with molecular weight of 2000, 20kg of MDI-50 (Shanghai Kaiyn chemical Co., Ltd.) and 25kg of MDI isocyanate (fast commercial Co., Ltd. in Guangzhou city) according to the proportion of the component B, and stirring and mixing for 1 hour at the rotating speed of 800 r/min and the temperature of 80 ℃; and 2.3, adding the dimethylglyoxime solution obtained in the step 2.1 into the material obtained in the step 2.2, heating to 80 ℃ at the rotating speed of 800 revolutions per minute, removing acetone, and stirring and mixing for 2 hours.
Examples
Example 1
Referring to fig. 1, the easy-to-tear food packaging cover film disclosed by the application comprises a printing layer 1, wherein the printing layer is a PET film. The upper part of the printing layer 1 is sequentially compounded with a barrier layer 2 and an inner layer 3. The barrier layer 2 evaporates on the printing layer 1 and plates the compound self-healing polyurethane layer 22 of the layer 21 of aluminium of blocking and plating, and self-healing polyurethane layer 22 is formed by the self-healing polyurethane tree of preparation example 2, can play the effect of self-healing, guarantees to have good separation nature. The inner layer 3 comprises a corona layer 4, a middle layer 5, a binding layer 6 and a heat sealing layer 7, and the corona layer 4 is compounded on the upper surface of the barrier layer 2; the middle layer 5 is compounded on the upper surface of the corona layer 4; the bonding layer 6 is compounded on the upper surface of the middle layer 5; the heat sealing layer 7 is compounded on the upper surface of the bonding layer 6. The corona layer 4 is prepared from ethylene and propylene binary copolymer, and the surface of the corona layer is subjected to corona treatment to improve the binding force between films. The intermediate layer 5 is made of homo-polypropylene.
The bonding layer 6 is made of the following raw materials in percentage by weight: 30 percent of metallocene polypropylene, 30 percent of metallocene polyethylene and 40 percent of butene ternary copolymerized polypropylene. The heat sealing layer 7 is prepared from the following raw materials in percentage by weight: 22% of LDPE, 73% of TAFMER, 0.2% of erucamide, 0.1% of YY-5031 modifier, 0.5% of oleamide and 4.5% of the antibacterial master batch of the preparation example 1.
A preparation method of an easy-to-tear food packaging cover film comprises the following steps:
step 1, preparing an inner layer 3, weighing ingredients of a corona layer 4, an intermediate layer 5, a binding layer 6 and a heat sealing layer 7 according to a ratio, respectively, feeding the ingredients into a feeding end of a four-screw co-extruder, and dividing extrusion temperature into six regions: extruding, casting and cooling at the temperature of 180 ℃, 190 ℃, 195 ℃, 225 ℃ and the temperature of an extrusion grinding tool head of 240 ℃ to obtain an inner layer 3 formed by mutually compounding a corona layer 4, an intermediate layer 5, a binding layer 6 and a heat sealing layer 7;
step 2, forming an aluminum-plated layer 21 on the printing layer 1 by adopting a vacuum evaporation method to obtain a prefabricated printing layer;
and 3, coating self-healing polyurethane resin on the prefabricated printing layer in the step 2 to form a self-healing polyurethane layer 22, attaching the inner layer 3 and the self-healing polyurethane layer 22 in the step 1, cooling at room temperature, and cutting to obtain the target covering film.
Example 2
Example 2 differs from example 1 in that: the bonding layer 6 is made of the following raw materials in percentage by weight: 30 percent of metallocene polypropylene, 35 percent of metallocene polyethylene and 35 percent of butene ternary copolymerized polypropylene.
Example 3
Example 3 differs from example 1 in that: the bonding layer 6 is made of the following raw materials in percentage by weight: 35 percent of metallocene polypropylene, 30 percent of metallocene polyethylene and 35 percent of butene ternary copolymerized polypropylene.
Example 4
Example 4 differs from example 1 in that: the bonding layer 6 is made of the following raw materials in percentage by weight: 20 percent of metallocene polypropylene, 30 percent of metallocene polyethylene and 50 percent of butene ternary copolymerized polypropylene.
Example 5
Example 5 differs from example 1 in that: the bonding layer 6 is made of the following raw materials in percentage by weight: 30 percent of metallocene polypropylene, 20 percent of metallocene polyethylene and 50 percent of butene ternary copolymerized polypropylene. .
Example 6
Example 6 differs from example 1 in that: the heat sealing layer 7 is prepared from the following raw materials in percentage by weight: 20% of LDPE, 75% of TAFMER, 0.2% of erucamide, 0.1% of YY-5031 modifier, 0./5% of oleamide and 4.5% of the antibacterial master batch of preparation example 1.
Example 7
Example 7 differs from example 1 in that: the heat sealing layer 7 is prepared from the following raw materials in percentage by weight: 25% of LDPE, 70% of TAFMER, 0.2% of erucamide, 0.1% of YY-5031 modifier, 0./5% of oleamide and 4.5% of the antibacterial master batch of preparation example 1.
Example 8
Example 8 differs from example 1 in that: the heat sealing layer 7 is prepared from the following raw materials in percentage by weight: 30% of LDPE, 65% of TAFMER, 0.2% of erucamide, 0.1% of YY-5031 modifier, 0./5% of oleamide and 4.5% of the antibacterial master batch of preparation example 1.
Comparative example
Comparative example 1
An easy-uncovering film with constant heat-seal strength and firm sealing and sealing comprises a heat-seal layer, a core layer and a corona layer, wherein the heat-seal layer is made of propylene/methyl acrylate copolymer, the methyl acrylate content is 10%, the easy-uncovering film is obtained through free radical copolymerization under high temperature and high pressure, the melt index of the easy-uncovering film is 2-3 g/l0min (test conditions: standard caliber is 2.095mm, temperature is 230 ℃ and load is 2.16kg), finally, the easy-uncovering film is obtained through plasticizing and extruding by an extruder, the melt index of the easy-uncovering film is 6-8 g/10min (test conditions: standard caliber is 2.095mm, temperature is 230℃ and load is 2.16kg), the grafting amount of maleic anhydride grafting compatilizer is 4%, the weight ratio of the maleic anhydride grafting compatilizer to the propylene homopolymer is 12:100, the corona layer is made of propylene/ethylene random copolymer, the melt index is 6-8 g/10min (test conditions are that the standard caliber is 2.095nm, the temperature is 230℃, and the load is 2.l6kg), the heat-sealing layer is plasticized and extruded at 230 ℃, the core layer and the corona layer are plasticized and extruded at 240 ℃, then the core layer and the corona layer are cast into a film through a T-shaped die, the cooling temperature of a casting roller is 25 ℃, then the core layer and the corona layer are wound at 70m/min, the surface of the corona layer is subjected to corona spark treatment, the corona tension of the corona layer is 46mN/m, the total thickness of the obtained easy-uncovering film is 50 mu m, and the thickness of the heat-sealing layer is 10 mu m.
Comparative example 2
Comparative example 2 differs from example 1 in that: the self-healing polyurethane layer 22 is replaced with a polyurethane glue layer.
Test method
1. Testing of heat seal strength: the instrument is a heat sealing machine, single-knife heating is carried out, and the heating width is 5mm or more; and (5) performing a tensile test by using a tensile testing machine. Sample preparation: two films 100mm long and 15mm wide were laminated together in heat-seal contact and covered with a Polyester (PET) film 12 μm thick and 1.2 μm thick. The film is placed between two welding knives of a heat sealing machine, the welding knives are perpendicular to the film surface, the upper welding knife is used for heating, the film is sealed together by using the pressure of 0.2MPa for 1s, and therefore samples 1-8 and comparative samples 1-2 are obtained. At the same temperature, the above operation was repeated to prepare 5 samples. The heat-seal temperature was raised by about 5 ℃ to prepare 5 additional samples. The treatment process comprises the following steps: and clamping two ends of the sample on clamps of a stretcher respectively, wherein the distance between the clamps is more than or equal to 50 mm. The heat-seal strength was measured at a rate of (300 s 30) mm/min, and a total of 5 samples were tested at each heat-seal temperature, and the heat-seal strength was averaged, and a graph of temperature versus heat-seal strength was prepared to estimate the heat-seal temperature at which the heat-seal strength was 3N/15 mm.
2. The pressure is 0.2Mpa, the time is: 1s, sealing temperature: and (3) testing the conditions of the samples 1-8 and the comparative samples 1-2 on the uncovering trace at 25 ℃ by taking a polypropylene (PP) cup body material as a test condition at 155 ℃.
3. Puncture Strength test the puncture strength of the packaging bags prepared in examples 1 to 8 and comparative examples 1 to 2 was tested according to the regulations of GB/T10004 to 2008> 6.6.13.
4. Preparing test samples 1-8 and comparison samples 1-2 with the specification of 50mm x 30mm, cutting a through opening with a knife of 15mm at the same position of the test samples 1-8 and the comparison samples 1-2, and penetrating and healing every 30 minutes.
Performance test
Table 1 shows the heat seal strength test parameters of test samples 1 to 8 and comparative samples 1 to 2
Table 2 shows the puncture strength and the mark-off test parameters of the test samples 1 to 8 and the comparative samples 1 to 2
Table 3 shows the healing test parameters of test samples 1 to 8 and comparative samples 1 to 2
By combining examples 1-8 and comparative examples 1-2 and combining table 1, it can be seen that the cover film of the present application is heat-sealed at 150-160 ℃, the heat-sealing strength is stabilized at 5.3N/15mm, and the cover film is easy to uncover. Compared with the comparative example 1, the heat sealing strength of the heat sealing film is more stable than that of the heat sealing film in the comparative example 1 because the heat sealing is carried out at 140-180 ℃, and the acting force for uncovering the covering film is more stable.
By combining the examples 1 to 8 and the comparative examples 1 to 2 and combining the table 2, it can be seen that the examples 1 to 8 of the present application have good puncture resistance, are not easily damaged, and are convenient to transport and store; this application epiphragma is taken off from the polypropylene cup, and the polypropylene cup does not have the residue and does not have blushing, and the trace is smooth, takes off the membrane surface and does not have the damage.
Combining examples 1-8 and comparative examples 1-2 and combining table 3, it can be seen that the present application can self-heal within 2 hours, resealing the polypropylene cup. The food packaging box has a good barrier effect, is convenient for food packaging and storage, and improves the food storage time.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides an easy food package epiphragma that tears off which characterized in that: the printing structure comprises a printing layer (1), wherein a barrier layer (2) is compounded on the upper surface of the printing layer (1); the upper surface of the barrier layer (2) is compounded with an inner layer (3); the inner layer (3) comprises a corona layer (4), a middle layer (5), a binding layer (6) and a heat sealing layer (7), and the corona layer (4) is compounded on the upper surface of the barrier layer (2); the middle layer (5) is compounded on the upper surface of the corona layer (4); the bonding layer (6) is compounded on the upper surface of the middle layer (5); the heat sealing layer (7) is compounded on the upper surface of the binding layer (6).
2. A peelable lid film for food packaging according to claim 1 wherein: the bonding layer (6) is made of raw materials comprising the following weight percentages: 20-30% of metallocene polypropylene, 20-30% of metallocene polyethylene and 30-60% of butene ternary copolymer polypropylene.
3. A peelable lid film for food packaging according to claim 1 wherein: the heat sealing layer (7) is prepared from the following raw materials in percentage by weight: 20-30% of LDPE, 60-80% of TAFMER and the balance of additives.
4. A peelable lid film for food packaging according to claim 1 wherein: the middle layer (5) is prepared from homopolymerized polypropylene; the corona layer (4) is prepared from ethylene and propylene binary copolymer.
5. A peelable lid film for food packaging according to claim 3 wherein: the additive comprises 0.1-0.5% of slipping agent and 0.5-5.0% of bactericide.
6. The easy-to-tear food packaging cover film of claim 5, wherein: the slipping agent is one or a combination of more of microbead erucamide, oleamide and YY-5031 modifier; the bactericide is antibacterial master batch which is prepared from the following raw materials in percentage by weight: 10-25% of silver ion antibacterial agent, 15-25% of LDPE and the balance of TAFMER.
7. A peelable lid film for food packaging according to claim 1 wherein: the barrier layer (2) comprises an aluminum-plated layer (21) evaporated on the printing layer (1) and a self-healing polyurethane layer (22) compounded with the aluminum-plated layer (22).
8. A peelable lid film for food packaging according to claim 1 wherein: the self-healing polyurethane layer (22) is formed by polymerizing a component A and a component B; 100 parts of polyether polyol with the molecular weight of 2000, 0.5 part of pentaerythritol diphosphite diisodecyl ester, 1.2 parts of foam homogenizing agent, 2.0 parts of polyether modified polysiloxane, 1.2 parts of polyurethane type high molecular dispersing agent, 5 parts of 1, 5-pentanediol and 0.2 part of bismuth octyldecanoate; the component B is prepared from the following raw materials in parts by weight: 100 parts of polyether polyol PTMEG with the molecular weight of 2000, 80 parts of MDI-50, 120 parts of MDI isocyanate, 20 parts of dimethylglyoxime and 100 parts of acetone.
9. A preparation method of the easy-to-tear food packaging cover film is characterized by comprising the following steps: the method comprises the following steps:
step 1, preparing an inner layer (3), weighing ingredients of a corona layer (4), an intermediate layer (5), a binding layer (6) and a heat sealing layer (7) according to a ratio, respectively, putting the ingredients into a multi-screw co-extruder respectively, wherein the extrusion temperature is divided into six zones, namely 180 ℃, 190 ℃, 195 ℃, 225 ℃ and 240 ℃ of an extrusion grinding tool head, and obtaining the inner layer (3);
step 2, forming an aluminum-plated blocking layer (21) on the printing layer (1) through vacuum evaporation to obtain a prefabricated printing layer;
and 3, coating self-healing polyurethane resin on the prefabricated printing layer in the step 2 to form a self-healing polyurethane layer (22), compounding the inner layer (3) and the self-healing polyurethane layer (22), cooling and cutting to obtain the covering film.
10. The method for preparing a peelable food packaging cover film according to claim 9, wherein: before the step 3, preparing a self-healing polyurethane tree, wherein the self-healing polyurethane tree is prepared from a component A and a component B; wherein, the component A is prepared by the following steps: weighing polyether polyol with the molecular weight of 2000, pentaerythritol diphosphite, diisodecyl ester, a foam stabilizer, polyether modified polysiloxane, a polyurethane type polymeric dispersant and bismuth octodecanoate according to the proportion of the component A, stirring and mixing for 1-2 hours at 76.5 ℃, adding 1, 5-pentanediol with accurate measurement, and stirring and mixing for 2-3 hours; preparing a component B, weighing dimethylglyoxime and acetone according to the proportion of the component B to dissolve the dimethylglyoxime in the acetone, weighing polyether polyol with the molecular weight of 2000, MDI-50 and MDI isocyanate according to the proportion of the component B, stirring and mixing for 1-2 hours at 80 ℃, adding dimethylglyoxime dissolved in the acetone, heating to 80 ℃, removing the acetone, and stirring and mixing for 2-3 hours; the prepared component A and the component B are mixed according to the weight ratio of 1: 1, stirring and mixing for 5-15 min at the mixing temperature of 20-30 ℃ and the rotating speed of 800-1200 r/min, and obtaining the cured polyurethane resin.
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| CN113681993A (en) * | 2021-08-26 | 2021-11-23 | 浙江大汇新材料有限公司 | Fresh-keeping, bacteriostatic and breathable packaging film for ship fruit and vegetable transportation and preparation method thereof |
| CN113682017A (en) * | 2021-08-26 | 2021-11-23 | 浙江大汇新材料有限公司 | Visible easy-tearing food packaging film and preparation process thereof |
| CN114379180A (en) * | 2021-12-29 | 2022-04-22 | 和盛包装科技(海宁)股份有限公司 | Composite packaging film with bacteria barrier protection function and preparation method thereof |
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| CN113682017A (en) * | 2021-08-26 | 2021-11-23 | 浙江大汇新材料有限公司 | Visible easy-tearing food packaging film and preparation process thereof |
| CN114379180A (en) * | 2021-12-29 | 2022-04-22 | 和盛包装科技(海宁)股份有限公司 | Composite packaging film with bacteria barrier protection function and preparation method thereof |
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