CN113103701B - Easy-to-tear antifogging packaging film and preparation method thereof - Google Patents

Easy-to-tear antifogging packaging film and preparation method thereof Download PDF

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CN113103701B
CN113103701B CN202110498592.4A CN202110498592A CN113103701B CN 113103701 B CN113103701 B CN 113103701B CN 202110498592 A CN202110498592 A CN 202110498592A CN 113103701 B CN113103701 B CN 113103701B
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layer
easy
tear
packaging film
parts
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CN113103701A (en
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胡钢
王庆
张惕
夏大雁
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Green Packaging Material Jiangyin Co ltd
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Green Packaging Material Jiangyin 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • 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
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Abstract

The invention discloses an easy-to-tear anti-fog packaging film which is a co-extrusion film and comprises an easy-to-tear heat sealing layer, a first bonding layer, a blocking layer, a second bonding layer and a surface layer from inside to outside; the surface layer comprises an A layer and a B layer which are compounded from outside to inside; the main composition of the layer A comprises mLLDPE, LLDPE and LDPE; the main composition of the layer B comprises LLDPE and LDPE; the easy-uncovering heat-sealing layer mainly comprises, by mass, 19-74 parts of LDPE, 10-25 parts of mLLDPE, 5-30 parts of PB and 10-25 parts of antifogging master batch. The easy-to-tear antifogging packaging film has the advantages that the heat sealing strength is controlled within the range of 3 to 10N by adjusting the addition amounts of antifogging master batches and PB in the heat sealing layer, the heat sealing surface is easy to tear, and the easy-to-tear force is uniform and stable; the antifogging property is good, the light transmittance is high, and the processing is easy. The invention also discloses a preparation method of the easy-to-tear antifogging packaging film.

Description

Easy-to-tear anti-fog packaging film and preparation method thereof
Technical Field
The invention relates to the field of packaging materials, in particular to an easy-to-tear anti-fog packaging film and a preparation method thereof.
Background
With the development of society, people have higher and higher requirements on food packaging. In the fruit and vegetable field, these foods are from picking the washing, packing, transporting, refrigerating, to selling again, the external temperature difference with packing in this in-process changes repeatedly, and these foods all contain moisture, very easily produce water smoke in the bag, influence the food in the consumer observes the packing, and the water smoke condenses into water droplet and easily leads to food corruption after contacting food, consequently, the packing that requires fruit and vegetable class needs to possess antifog performance good, the transparency is high, fresh-keeping effect is good and characteristics such as difficult damage, consumer's experience and difficult degree to open the packing also pay attention to gradually simultaneously, can unpack the packing fast.
The fruit and vegetable packaging film on the market at present has single performance, and can not meet the requirements of multiple performances such as easy uncovering, fog prevention, light transmittance and the like at the same time, and the reason is that: on one hand, the more the functionality is, the higher the cost is, and on the other hand, the difficulty is brought to the production and the processing by adding the functional master batch; the film easy to uncover in the current market has the problems of uncontrollable heat-seal strength and unstable easy uncovering performance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the easy-to-tear anti-fog packaging film which is easy to process, controllable in heat-seal strength and good in easy-to-tear performance.
In order to realize the process effect, the technical scheme of the invention is as follows: an easy-to-tear anti-fog packaging film comprises an easy-to-tear heat sealing layer, a first bonding layer, a blocking layer, a second bonding layer and a surface layer from inside to outside;
the surface layer comprises an A layer and a B layer which are compounded from outside to inside;
the main composition of the layer A comprises mLLDPE, LLDPE and LDPE;
the main composition of the B layer comprises LLDPE and LDPE;
the easy-uncovering heat-sealing layer mainly comprises, by mass, 19-74 parts of LDPE, 10-25 parts of mLLDPE, 5-30 parts of PB and 10-25 parts of antifogging master batch.
The first adhesive layer and the second adhesive layer both comprise LLDPE and modified LLDPE, the modified LLDPE is one of PX3060 or PX3747, and the bonding strength of PX3747 is better.
In order to obtain the fruit and vegetable packaging film which is easy to tear and prevent fog, and the heat sealing strength is controlled to be 3-10N, and the heat sealing surface is easy to tear, the preferable technical scheme is as follows: the easy-to-uncover heat-sealing layer mainly comprises, by mass, 30-60 parts of LDPE, 15-20 parts of mLLDPE, 15-25 parts of PB and 15-25 parts of antifogging master batch. Furthermore, the easy-uncovering heat-sealing layer mainly comprises 40-50 parts of LDPE, 15-18 parts of mLLDPE, 15-20 parts of PB and 18-22 parts of antifogging master batch by mass. The addition of LDPE effectively improves the processability of mLLDPE; the higher the mLLDPE content is, the higher the heat-sealing strength is, the lower the mechanical strength of the undersized film layer is; PB has low heat sealing performance, the transparency is influenced by fogging of a packaging film due to excessive addition, and the transparency is poor due to insufficient addition and easy uncovering; too much content of the antifogging master batch can cause fogging of the packaging film to influence transparency, and too small antifogging effect is poor.
In order to achieve the optimal easy-uncovering effect of the packaging film, the preferable technical scheme is as follows: the PB is named as Bazier 8640M and/or Bazier SP2000B.
In order to achieve the optimal antifogging effect of the packaging film, the preferable technical scheme is as follows: the grade of the antifogging master batch is Hua Yi 03841.
In order to make the preparation and processing of the packaging film more stable, the preferable technical scheme is as follows: the easy-to-tear heat-sealing layer also comprises polyphthalamide, wherein the polyphthalamide accounts for 0.1-1% of the main composition of the easy-to-tear heat-sealing layer. In order to make the surface of the packaging film smoother and improve the quality of the packaging film, the mass percentage of the polyphthalamide in the easy-to-tear heat-sealing layer is 0.1-0.6%. Furthermore, the mass percentage of the polyphthalamide in the easy-to-uncover heat sealing layer is 0.2-0.5%.
In order to obtain a packaging film with stable processing performance and good quality, the preferable technical scheme is as follows: the density of LDPE which is mainly formed in the easy-to-uncover heat-seal layer is 0.910-0.925 g/cm 3 The melt index is 1.5-2.1 g/10min; the density of the mLLDPE is 0.910-0.920 g/cm 3 The melt index is 0.9-1.3 g/10min; the density of PB is 0.800-0.950 g/cm 3 The melt index is 2-4 g/10min; the density of the antifogging master batch is 0.800-0.950 g/cm 3 The melt index is 2-4 g/10min. Furthermore, the density of LDPE which is mainly formed in the easy-to-open heat-sealing layer is 0.920-0.925 g/cm 3 The melt index is 1.8-2.1 g/10min; the density of mLLDPE is 0.916-0.920 g/cm 3 The melt index is 0.9-1.3 g/10min; the density of PB is 0.850-0.950 g/cm 3 The melt index is 2.0-3.6 g/10min; the density of the antifogging master batch is 0.900-0.950 g/cm 3 The melt index is 2.2-3.2 g/10min.
In order to realize good mechanical property of the surface layer, easy corona treatment, small haze and high light transmittance, the preferred technical scheme is as follows: the mass ratio of mLLDPE, LLDPE and LDPE which are main components of the layer A is (1-2): (2-4): 1; the mass ratio of LLDPE and LDPE which are main components of the layer B is (2-4): 1. further, the mass ratio of mLLDPE, LLDPE and LDPE which are main components of the layer A is (1-1.5): (2-3): 1; the mass ratio of LLDPE and LDPE which are main components of the layer B is (2-3.5): 1.
in order to achieve the optimal barrier performance of the packaging film, the preferable technical scheme is as follows: the barrier layer is at least one of PA or EVOH.
In order to optimize the layer thickness of the surface layer and the easy-to-tear heat-sealing layer, the preferable technical scheme is as follows: the layer thickness ratio of the layer A to the layer B to the easy-to-uncover heat-seal layer is 1:1: (1-5), and the layer thickness of the A layer is 2-10 mu m. Further, the layer thickness ratio of the layer A, the layer B and the easy-to-tear heat-sealing layer is 1:1: (2-5), the layer thickness of the layer A is 3-9 μm. Furthermore, the layer thickness ratio of the layer A, the layer B and the easy-to-tear heat-sealing layer is 1:1: (3-5), the layer thickness of the A layer is 4-7 μm. The larger the layer thickness of the easy-to-tear heat-sealing layer is, the higher the heat-sealing strength of the packaging film is, the too small a thickness of the easy-to-tear heat-sealing layer can cause wire drawing, and the easy-to-tear performance is unstable.
The invention also aims to provide a preparation method of the easy-to-uncover antifogging packaging film, wherein the easy-to-uncover antifogging packaging film is prepared by the steps of extruding the easy-to-uncover heat-sealing layer at 205-215 ℃, extruding the layer A at 210-220 ℃ and extruding the layer B at 205-215 ℃. Furthermore, the extrusion temperature of the easy-to-uncover heat-seal layer is 210-215 ℃, the extrusion temperature of the layer A is 210-215 ℃, and the extrusion temperature of the layer B is 210-215 ℃.
The invention has the advantages and beneficial effects that:
the anti-fog packaging film easy to tear is characterized in that the heat sealing strength is controlled within the range of 3-10N by adjusting the addition amounts of the anti-fog master batches and PB in the heat sealing layer component, the heat sealing surface is easy to tear, and the easy tearing force is uniform and stable; the antifogging property is good, the light transmittance is high, and the processing is easy.
Definition of
In the present disclosure, the term "PE" refers to polyethylene, which is a typical thermoplastic material, and can be subdivided into LDPE, LLDPE, and HDPE.
In the present disclosure, the term "LDPE" refers to low density polyethylene.
In the present disclosure, the term "LLDPE" refers to a linear low density polyethylene that is structurally different from a general low density polyethylene because of the absence of long chain branching.
In the present disclosure, the term "mLLDPE" refers to a polymer prepared by ethylene polymerization using a metallocene complex as a catalyst.
In the present disclosure, the term "PPA" refers to polyphthalamide, a semi-aromatic polyamide made from terephthalic acid or isophthalic acid, which has high hardness, high strength, and good chemical resistance.
In the present disclosure, the term "PB" refers to a polybutene resin, which is a monoolefin copolymerized from isobutylene and n-butene, having a structure almost all of long chains, and having one double bond.
In the present disclosure, the term "PA" refers to polyamide, also called nylon, which is a generic name for plastics made of high molecular polymers containing amide genes in the macromolecular chain.
In the present disclosure, the term "EVOH" refers to an ethylene/vinyl alcohol copolymer, combines processability of an ethylene polymer and barrier effect of a vinyl alcohol polymer, has excellent processability, and exhibits excellent blocking effect against gas, odor, solvent, and the like.
Detailed Description
The following examples are provided to further illustrate embodiments of the present invention. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Metallocene linear low density polyethylene is manufactured by exxon mobil corporation under the trade designation 1018MF;
low density polyethylene is manufactured by exxon Mobil corporation under the trade designation 100AC;
linear low density polyethylene manufactured by exxon mobil corporation under the trade designation 1002XBU;
the polybutene resin is produced by Liandedsel industry with a trade mark of 8640M or SP2000B;
the antifogging master batch is manufactured by Hongkong Huayi scientific and technological development limited company, and the commodity number is 03841;
polyphthalamide is manufactured by Hongkong Huayi scientific and technological development limited company, and the trade mark is PEA-3S;
polyamide manufactured by Pasteur, germany under the trade designation B36LN;
ethylene/vinyl alcohol copolymer was produced by the japanese synthetic chemistry, with a commercial designation ET3803RB;
example 1
The easy-to-tear antifogging packaging film comprises an easy-to-tear heat sealing layer, a first adhesive layer, a barrier layer, a second adhesive layer and a surface layer from inside to outside; the easy-to-uncover heat-sealing layer comprises LDPE, mLLDPE, PB, antifogging master batch and PPA; the surface layer comprises an A layer and a B layer which are compounded from outside to inside; the composition of the A layer comprises mLLDPE, LLDPE and LDPE; the composition of the B layer comprises LLDPE and LDPE;
the easy-uncovering heat-sealing layer comprises 100AC50 parts of LDPE Exxon, 15 MF parts of mLLDPE, 16M parts of PB Basel 8640, 19.5 parts of Wallace 03841 antifogging master batch and 3S0.5 parts of PPA Hua Yi PEA-3S0.5 by mass parts; composition of layer a mLLDPE exxon 1018MF30 parts, LLDPE exxon 1002XBU50 parts, and LDPE exxon 100AC20 parts; the composition of the B layer was LLDPE exxon 1002XBU70 parts and LDPE exxon 100AC30 parts.
The barrier layer is from outside to inside including first barrier layer and second barrier layer, and first barrier layer is PA, and the second barrier layer is EVOH. PA is BASF B36LN, EVOH is Japanese Synthesis chemical ET3803RB.
The first adhesive layer and the second adhesive layer both comprise LLDPE and modified LLDPE, wherein the LLDPE1002XBU accounts for 75 parts by weight, and the PX3747 modified LLDPE accounts for 25 parts by weight
The density of LDPE formed by the easy-to-uncover heat-seal layer is 0.923g/cm 3 The melt index is 2g/10min; the density of the mLLDPE was 0.918g/cm 3 The melt index is 1g/10min; the density of PB was 0.94g/cm 3 The melt index is 3.5g/10min; anti-fogThe density of the master batch is 0.94g/cm 3 The melt index was 3.5g/10min.
The layer thickness of the A layer is 5.6 μm, the layer thickness of the B layer is 5.6 μm, the layer thickness of the easy-open heat-seal layer is 21 μm, the layer thickness of the first barrier layer is 14 μm, the layer thickness of the second barrier layer is 3.5 μm, and the layer thickness of the first adhesive layer and the layer thickness of the second adhesive layer are both 5 μm.
The preparation method of the easy-to-uncover antifogging packaging film comprises the following steps: the extrusion temperature of the easy-to-uncover heat-seal layer is 215 ℃, the extrusion temperature of the layer A is 215 ℃, the extrusion temperature of the layer B is 210 ℃, the extrusion temperature of the first barrier layer is 245 ℃, the extrusion temperature of the second barrier layer is 220 ℃, and the extrusion temperature of the first adhesive layer and the extrusion temperature of the second adhesive layer are 225 ℃.
Example 2
Example 2 is based on example 1 except that the peel heat seal layer is not PPA added.
Example 3
Example 3 is based on example 1 except that the composition of the peel heat seal layer is, in parts by mass, 100 parts of LDPE exxon AC50 parts, 1018MF15 parts of mLLDPE exxon, 5 parts of PB basel 8640M, 19.5 parts of 03841 antifog masterbatch and 3S0.5 parts of PPA Hua Yi PEA-4736.
Example 4
Example 3 is based on example 1 with the difference that the composition of the peel heat seal layer is, in parts by mass, 100AC50 parts of LDPE exxon, 15 parts of mLLDPE exxon 1018MF, 16 parts of PB basel 8640M, 10 parts of friendship 03841 antifog masterbatch and 4736 zxft PPA Hua Yi PEA-3S0.5.
Example 5
Example 5 is based on example 1 with the difference that the layer thickness of the easy-open heat-seal layer is 5.6 μm.
Example 6
Example 6 is based on example 1 with the difference that the layer thickness of the easy-open heat-sealable layer is 28 μm.
Comparative example 1
Comparative example 1 is based on example 1 except that the composition of the peel heat seal layer is LDPE exxon 100AC50 parts, mLLDPE exxon 1018MF15 parts, PB basel 8640M2 parts, friendship 03841 antifog masterbatch 19.5 parts, and PPA Hua Yi PEA-3S0.5 parts.
Comparative example 2
Comparative example 2 is based on example 1 except that the composition of the peel heat seal layer is LDPE exxon 100AC50 parts, mLLDPE exxon 1018MF15 parts, PB basel 8640M16 parts, friendship 03841 antifog masterbatch 5 parts, and PPA Hua Yi PEA-3S0.5 parts.
The detection method of the sample comprises the following steps:
1. and (3) measuring tensile strength: according to test standard GB/T1040.3-2006;
2. water vapor transmission amount measurement: according to test standard GB/T1037-1988;
3. oxygen transmission capacity measurement: according to test standard GB/T1038-2000;
4. and (3) measuring light transmittance: according to test standard GB/T2410-2008;
5. and (3) measuring the heat seal strength: according to test standard QB/T2358-1998;
6. and (3) antifogging performance determination: according to test standard GB/T31726-2015.
The results of the measurements of the examples and comparative examples are given in the following table:
Figure BDA0003055507310000071
Figure BDA0003055507310000081
compared with the example 2, the preparation process of the packaging film is more stable and the light transmittance is improved by adding the PPA into the easily-uncovered heat-sealing layer in the example 1;
in example 3, compared with example 1, the addition amount of PB is reduced, the light transmittance is further improved, the heat seal strength is increased, and the easy uncovering performance is unstable;
compared with the example 1, the example 4 has the advantages that the addition amount of the antifogging master batch is reduced, the light transmittance is further improved, and the antifogging performance is reduced;
compared with the example 1, the thickness of the easily-torn heat-sealing layer is reduced, the heat-sealing strength is increased, and the phenomena of unevenness such as wire drawing, frizz and the like occur after the seal is torn off in the examples 5 and 6; the thickness of the easy-to-tear heat-sealing layer is increased, the heat-sealing strength is reduced, the easy-to-tear performance is stable, but the light transmittance of the film is reduced, and the cost is increased;
compared with the example 1, the addition amount of PB of the comparative example 1 is too small, and the uncovering performance is poor;
comparative example 2 compared with example 1, the antifogging master batch added amount was too small, and the antifogging property was not good.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. An easy-to-tear anti-fog packaging film is characterized by being a co-extrusion film and comprising an easy-to-tear heat sealing layer, a first adhesive layer, a blocking layer, a second adhesive layer and a surface layer from inside to outside;
the surface layer comprises an A layer and a B layer which are compounded from outside to inside;
the main composition of the layer A comprises mLLDPE, LLDPE and LDPE;
the main composition of the B layer comprises LLDPE and LDPE;
the easy-to-uncover heat-seal layer mainly comprises, by mass, 30-60 parts of LDPE, 15-20 parts of mLLDPE, 15-25 parts of PB and 15-25 parts of antifogging master batch;
the mass ratio of the main components mLLDPE, LLDPE and LDPE of the layer A is (1~2): (2~4): 1; the mass ratio of LLDPE to LDPE of the B layer is (2~4): 1;
the layer thickness ratio of the layer A to the layer B to the easy-to-uncover heat-seal layer is 1:1: (1~5), the layer thickness of the layer A is 2 to 10 μm.
2. The easy-to-tear anti-fog packaging film of claim 1, wherein the PB is named basel 8640M and/or basel SP2000B.
3. The easy-uncovering antifog packaging film of claim 1, wherein the anti-fog master batch is Hua Yi 03841.
4. The easy-to-tear anti-fog packaging film according to claim 1, wherein the easy-to-tear heat-sealing layer further comprises polyphthalamide, and the polyphthalamide accounts for 0.1 to 1 percent of the main components of the easy-to-tear heat-sealing layer.
5. The easy-to-uncover antifog packaging film according to claim 1, characterized in that the density of LDPE which is mainly formed in the easy-to-uncover heat sealing layer is 0.910 to 0.925g/cm 3 The melt index is 1.5 to 2.1g/10min; the density of mLLDPE is 0.910 to 0.920g/cm 3 The melt index is 0.9 to 1.3g/10min; the density of PB is 0.800 to 0.950g/cm 3 The melt index is 2 to 4g/10min; the density of the antifogging master batch is 0.800 to 0.950g/cm 3 The melt flow index is 2 to 4g/10min.
6. The easy-release antifog packaging film of claim 1, wherein the barrier layer is at least one of PA or EVOH.
7. A preparation method of an easy-to-tear anti-fog packaging film is characterized in that the easy-to-tear anti-fog packaging film is as claimed in any one of claims 1 to 6, the extrusion temperature of the easy-to-tear heat-sealing layer is 205-215 ℃, the extrusion temperature of the layer A is 210-220 ℃, and the extrusion temperature of the layer B is 205-215 ℃.
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