CN111590989B - NY/PE transparent vacuum compression bag for packaging low-temperature refrigerated food - Google Patents

NY/PE transparent vacuum compression bag for packaging low-temperature refrigerated food Download PDF

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Publication number
CN111590989B
CN111590989B CN202010384403.6A CN202010384403A CN111590989B CN 111590989 B CN111590989 B CN 111590989B CN 202010384403 A CN202010384403 A CN 202010384403A CN 111590989 B CN111590989 B CN 111590989B
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parts
temperature
packaging
refrigerated food
nylon
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CN111590989A (en
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茆贵云
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Hefei Foside New Material Technology Co ltd
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Hefei Foside New Material Technology 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • 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
    • B32B1/00—Layered products having a general shape other than plane
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • 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
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • 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
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • 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
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—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
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—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
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—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
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • 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
    • C08J2439/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C08J2439/08—Homopolymers or copolymers of vinyl-pyridine

Abstract

The invention discloses an NY/PE transparent vacuum compression bag for packaging low-temperature refrigerated food, which relates to the technical field of vacuum packaging materials, and is prepared from an NY/PE composite film, wherein the NY/PE composite film adopts a double-layer co-extrusion structure of an NY surface layer and a PE inner layer.

Description

NY/PE transparent vacuum compression bag for packaging low-temperature refrigerated food
The technical field is as follows:
the invention relates to the technical field of vacuum packaging materials, in particular to an NY/PE transparent vacuum compression bag for packaging low-temperature refrigerated food.
Background art:
vacuum compression bags are widely used in food packaging and require excellent barrier properties to prevent oxygen and water vapor from entering the bag and causing food spoilage. For low-temperature refrigerated food, the vacuum compression bag used by the low-temperature refrigerated food is also required to have certain low-temperature resistance, so that the problem that the packaging bag is brittle and even broken due to a low-temperature environment is avoided.
The early food vacuum compression bag adopts an aluminum-plastic composite film with good barrier property, generally has three layers, and the typical structure is a surface layer/adhesive/aluminum foil/adhesive/heat sealing layer, has high barrier property and high-temperature cooking resistance, is light and soft, and is widely used for packaging various foods. Later, the food packaged with the aluminum foil laminated film was not suitable for consumers to purchase because the food was opaque so that the color and shape of the contents were not visible to consumers, and the aluminum-plastic laminated package was not heated by microwave and was expensive compared to the plastic film. In addition, the compound of top layer, aluminium foil layer and heat-seal layer needs to be realized through the gluing agent when processing to the plastic-aluminum complex film, and the use of gluing agent not only can increase manufacturing procedure and still have the potential safety hazard in utilization.
The invention content is as follows:
the technical problem to be solved by the invention is to provide a preparation method of an NY/PE composite film, the prepared NY/PE composite film with a double-layer structure is used as a vacuum compression bag processing material, the sealing property of the vacuum compression bag is ensured by utilizing the excellent barrier property of the NY/PE composite film, and the NY/PE composite film is low-temperature resistant and suitable for being used as a vacuum compression bag for packaging low-temperature refrigerated food.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the NY/PE transparent vacuum compression bag for packaging the low-temperature refrigerated food is made of an NY/PE composite film, the NY/PE composite film adopts a double-layer co-extrusion structure of an NY surface layer and a PE inner layer, and the NY surface layer is composed of the following raw materials in parts by mass: 50-100 parts of nylon, 5-25 parts of polystyrene-poly-4-vinylpyridine and 1-5 parts of an anti-blocking agent; the PE inner layer is composed of the following raw materials in parts by mass: 50-100 parts of high-density polyethylene, 5-25 parts of ethylene-vinyl alcohol copolymer and 1-5 parts of anti-blocking agent.
The nylon is selected from one or more of nylon 11, nylon 12 and nylon 1010.
The anti-blocking agent is one or more of erucamide, stearamide, calcium stearate, zinc stearate, polyethylene wax and polypropylene wax.
The preparation method of the NY/PE composite membrane comprises the following steps: respectively feeding the blend for preparing the NY surface layer and the blend for preparing the PE inner layer into two single-screw extruders for melt extrusion, feeding the melt materials to a co-extrusion die head for merging, then carrying out drawing and cooling film formation by using a casting roller, carrying out cold and hot drawing after heat treatment, and finally carrying out heat setting to obtain the NY/PE composite film.
The temperature of the single-screw extruder of the blend of the NY surface layer is 180-230 ℃, the temperature of the single-screw extruder of the blend of the PE inner layer is 150-200 ℃, the temperature of the co-extrusion die head is 180-230 ℃, the temperature of the casting roll is 50-100 ℃, and the draft ratio is 5-20.
The heat treatment is carried out at the temperature of 100-.
The invention destroys the oriented lamellar crystal structure of the high molecular polymer through the working procedures of heat treatment, cold drawing, hot drawing and heat setting, induces the lamellar crystal deformation, and further optimizes the mechanical property of the NY/PE composite membrane.
The low-temperature resistance of the composite film is optimized by adding the polystyrene-poly-4-vinylpyridine into the NY surface layer, so that the novel application of the polystyrene-poly-4-vinylpyridine as a processing raw material of a packaging film material is realized.
Although the ethylene-vinyl alcohol copolymer has good barrier properties against gas, it shows hydrophilicity and hygroscopicity due to the presence of hydroxyl groups in the molecular structure, and thus has poor barrier properties against water vapor. In order to solve the problem, the invention carries out graft modification on the ethylene-vinyl alcohol copolymer, and reduces the hydrophilicity and the hygroscopicity by converting part of hydroxyl groups in the structure of the ethylene-vinyl alcohol copolymer into ether bonds.
The technical problem to be solved by the invention can also be realized by adopting the following technical scheme:
the NY/PE transparent vacuum compression bag for packaging the low-temperature refrigerated food is made of an NY/PE composite film, the NY/PE composite film adopts a double-layer co-extrusion structure of an NY surface layer and a PE inner layer, and the NY surface layer is composed of the following raw materials in parts by mass: 50-100 parts of nylon, 5-25 parts of polystyrene-poly-4-vinylpyridine and 1-5 parts of an anti-blocking agent; the PE inner layer is composed of the following raw materials in parts by mass: 50-100 parts of high-density polyethylene, 5-25 parts of ethylene-vinyl alcohol copolymer and 1-5 parts of anti-blocking agent;
the preparation method of the modified ethylene-vinyl alcohol copolymer comprises the following steps: dissolving ethylene-vinyl alcohol copolymer and hydroxyethyl ethylenediamine in water, adding a macroporous strong acid type cation exchange resin catalyst, heating for reaction, filtering to remove the macroporous strong acid type cation exchange resin catalyst when the reaction is finished, cooling to room temperature, standing in an environment of 3-10 ℃, filtering, drying the obtained precipitate, and thus obtaining the modified ethylene-vinyl alcohol copolymer.
The mass ratio of the ethylene-vinyl alcohol copolymer to the hydroxyethyl ethylenediamine to the macroporous strong acid type cation exchange resin catalyst is 1-5:1: 0.05-0.2.
The hydroxyethyl ethylenediamine is used as a modifier, part of hydroxyl in the structure of the ethylene-vinyl alcohol copolymer is converted into ether bond, and simultaneously, amino is grafted in the structure of the ethylene-vinyl alcohol copolymer, and the introduction of the groups can improve the barrier property of the composite film and optimize the low-temperature resistance of the composite film.
The rest process conditions and parameters of the technical scheme are the same as those of the technical scheme.
The invention has the beneficial effects that: the NY/PE composite film has excellent mechanical performance and barrier performance, especially outstanding low temperature resistance, no smell and no toxicity, and is transparent and suitable for being used as vacuum compressed bag for packing low temperature refrigerated food.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Nylon 12 in the following examples and comparative examples was purchased from Baitong New Material Co., Ltd, Dongguan; polystyrene-poly-4-vinylpyridine was purchased from sienna millennium biotechnology limited; high density polyethylene was purchased from Xintong plastic materials, Inc., of Dongguan; ethylene-vinyl alcohol copolymer purchased from the department of deflection of the Canelium bait fluorosilicone polymer material, Cancel, Yao City; the polyethylene wax is purchased from Shandonglong-Hui chemical Co., Ltd; the macroporous strong acid type cation exchange resin catalyst is purchased from Touchfang new era chemical building materials Co.Ltd.model 001X 7.
Example 1
Respectively feeding a blend for preparing an NY surface layer (85g of nylon 12, 15g of polystyrene-poly-4-vinylpyridine and 2g of polyethylene wax) and a blend for preparing an inner PE layer (90g of high-density polyethylene, 10g of ethylene-vinyl alcohol copolymer and 2g of polyethylene wax) into two single-screw extruders for melt extrusion, wherein the single-screw extruder temperature of the blend for preparing the NY surface layer is 210 ℃ in the I region, 220 ℃ in the II region, 230 ℃ in the III region, 230 ℃ in the IV region and 220 ℃ in the V region, the single-screw extruder temperature of the blend for preparing the inner PE layer is 170 ℃ in the I region, 180 ℃ in the II region, 190 ℃ in the III region, 190 ℃ in the V region, 180 ℃ in the co-extrusion die head, 70 ℃ in a casting roll and 12 in a drawing ratio; and then sending the molten material to a co-extrusion die head for merging, then utilizing a casting roller for drafting and cooling to form a film, carrying out cold and hot stretching after heat treatment, and finally carrying out heat setting, wherein the heat treatment is carried out at the temperature of 120 ℃ for 20min, the cold stretching is carried out at the temperature of 25 ℃, the stretching rate of 250%/min and the stretching ratio of 2 times, the hot stretching is carried out at the temperature of 130 ℃, the stretching rate of 80%/min and the stretching ratio of 2.5 times, and the heat setting is carried out at the temperature of 120 ℃ for 30min, so that the NY/PE composite film with the thickness of 50 mu m is obtained. And cutting and heat-sealing the prepared NY/PE composite film to obtain the transparent vacuum compression bag.
Example 2
Example 2 is different from example 1 in that the amounts of nylon and polystyrene-poly-4-vinylpyridine were adjusted to 80g of nylon 12 and 20g of polystyrene-poly-4-vinylpyridine, and the rest was the same.
Example 3
Example 3 is different from example 1 in that the ethylene-vinyl alcohol copolymer was replaced with an equal amount of the modified ethylene-vinyl alcohol copolymer, and the rest of the operation was exactly the same.
Preparation of modified ethylene-vinyl alcohol copolymer: dissolving 23g of ethylene-vinyl alcohol copolymer and 10g of hydroxyethyl ethylenediamine in water, adding 1g of macroporous strong acid type cation exchange resin catalyst, heating to 65 ℃ for reaction for 8h, filtering to remove the macroporous strong acid type cation exchange resin catalyst when the reaction is finished, cooling to room temperature of 22 ℃, standing in an environment of 5 ℃ for 12h, filtering, and drying the obtained precipitate in a 70 ℃ oven to obtain the modified ethylene-vinyl alcohol copolymer. The infrared spectrogram is 1112cm-1The absorption of ether bond was found at 3502cm-1The absorption of primary amine was found at 3318cm-1Absorption of the secondary amine is found.
Comparative example
The comparative example differs from example 1 in that instead of polystyrene-poly-4-vinylpyridine, 100g of nylon 12 was added directly.
The performance of the composite films prepared in the above examples and comparative examples was measured according to the following criteria, and the results are shown in Table 1.
GB/T8809-2015 'test method for testing pendulum impact resistance of plastic film' measures impact energy, and the impact energy range is 3J in units of J and A type punches.
GB/T1038-2000 pressure differential method for testing gas permeability of plastic film and sheet3/(m2.24h.0.1MPa)。
GB/T1037-88 cup method for testing Water vapor Permeability of Plastic films and sheets2.24h)。
TABLE 1
Item Example 1 Example 2 Example 3 Comparative example
Oxygen permeability 4.56 3.12 0.47 9.66
Water vapor transmission capacity 2.14 1.59 0.23 5.18
Impact energy at-20 DEG C 2.21 2.48 2.83 1.45
As can be seen from Table 1, the addition of polystyrene-poly-4-vinylpyridine and the graft modification of ethylene-vinyl alcohol copolymer are both beneficial to optimizing the low temperature resistance and the barrier property of the composite film.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The NY/PE transparent vacuum compression bag for packaging the low-temperature refrigerated food is characterized in that: the composite film is prepared from an NY/PE composite film, wherein the NY/PE composite film adopts a double-layer co-extrusion structure of an NY surface layer and a PE inner layer, and the NY surface layer is composed of the following raw materials in parts by mass: 50-100 parts of nylon, 5-25 parts of polystyrene-poly-4-vinylpyridine and 1-5 parts of an anti-blocking agent; the PE inner layer is composed of the following raw materials in parts by mass: 50-100 parts of high-density polyethylene, 5-25 parts of ethylene-vinyl alcohol copolymer and 1-5 parts of anti-blocking agent.
2. A NY/PE transparent vacuum compressed bag for packaging of cryogenically-refrigerated food according to claim 1, wherein: the nylon is selected from one or more of nylon 11, nylon 12 and nylon 1010.
3. A NY/PE transparent vacuum compressed bag for packaging of cryogenically-refrigerated food according to claim 1, wherein: the anti-blocking agent is one or more of erucamide, stearamide, calcium stearate, zinc stearate, polyethylene wax and polypropylene wax.
4. A NY/PE clear vacuum compressed bag for packaging of cryopreserved foods according to any one of claims 1 to 3, wherein: the preparation method of the NY/PE composite membrane comprises the following steps: respectively feeding the blend for preparing the NY surface layer and the blend for preparing the PE inner layer into two single-screw extruders for melt extrusion, feeding the melt materials to a co-extrusion die head for merging, then carrying out drawing and cooling film formation by using a casting roller, carrying out cold and hot drawing after heat treatment, and finally carrying out heat setting to obtain the NY/PE composite film.
5. A NY/PE transparent vacuum compressed bag for packaging of cryogenically-refrigerated food according to claim 4, wherein: the temperature of the single-screw extruder of the blend of the NY surface layer is 180-230 ℃, the temperature of the single-screw extruder of the blend of the PE inner layer is 150-200 ℃, the temperature of the co-extrusion die head is 180-230 ℃, the temperature of the casting roll is 50-100 ℃, and the draft ratio is 5-20.
6. A NY/PE transparent vacuum compressed bag for packaging of cryogenically-refrigerated food according to claim 4, wherein: the heat treatment is carried out at the temperature of 100-.
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