CN116041828A - High-temperature-resistant high-barrier polyethylene cooking film and preparation method thereof - Google Patents
High-temperature-resistant high-barrier polyethylene cooking film and preparation method thereof Download PDFInfo
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- CN116041828A CN116041828A CN202310012356.6A CN202310012356A CN116041828A CN 116041828 A CN116041828 A CN 116041828A CN 202310012356 A CN202310012356 A CN 202310012356A CN 116041828 A CN116041828 A CN 116041828A
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- -1 polyethylene Polymers 0.000 title claims abstract description 69
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 64
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 64
- 238000010411 cooking Methods 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 38
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 34
- 238000004132 cross linking Methods 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 21
- 230000004888 barrier function Effects 0.000 claims abstract description 21
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 19
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 19
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 17
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 17
- 229920000734 polysilsesquioxane polymer Polymers 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims abstract description 4
- 238000010894 electron beam technology Methods 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000009966 trimming Methods 0.000 claims description 16
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-triallyloxy-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 claims description 15
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 14
- 238000010096 film blowing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 11
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000010345 tape casting Methods 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- XYXJKPCGSGVSBO-UHFFFAOYSA-N 1,3,5-tris[(4-tert-butyl-3-hydroxy-2,6-dimethylphenyl)methyl]-1,3,5-triazinane-2,4,6-trione Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C)=C1CN1C(=O)N(CC=2C(=C(O)C(=CC=2C)C(C)(C)C)C)C(=O)N(CC=2C(=C(O)C(=CC=2C)C(C)(C)C)C)C1=O XYXJKPCGSGVSBO-UHFFFAOYSA-N 0.000 claims description 2
- YFHKLSPMRRWLKI-UHFFFAOYSA-N 2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenyl)sulfanyl-6-methylphenol Chemical compound CC(C)(C)C1=C(O)C(C)=CC(SC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 YFHKLSPMRRWLKI-UHFFFAOYSA-N 0.000 claims description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 239000005977 Ethylene Substances 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical group OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 abstract description 15
- 239000001301 oxygen Substances 0.000 abstract description 15
- 239000005003 food packaging material Substances 0.000 abstract description 3
- 238000009472 formulation Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 238000012545 processing Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000010025 steaming Methods 0.000 description 8
- 238000000071 blow moulding Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000007792 addition Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- JLRGJRBPOGGCBT-UHFFFAOYSA-N Tolbutamide Chemical group CCCCNC(=O)NS(=O)(=O)C1=CC=C(C)C=C1 JLRGJRBPOGGCBT-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Classifications
-
- 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
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
-
- 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
- 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
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- 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
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
- C08J2483/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- Chemical & Material Sciences (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention discloses a high-temperature-resistant high-barrier polyethylene steamed membrane and a preparation method thereof, wherein the polyethylene steamed membrane is prepared from the following raw materials in parts by weight: 5-15 parts of low-density polyethylene, 75-105 parts of high-density polyethylene, 3-12 parts of cage polysilsesquioxane, 5-10 parts of ethylene-vinyl alcohol copolymer, 0.2-0.8 part of irradiation crosslinking sensitizer and 0.1-0.3 part of antioxidant. The rigidity of the product obtained by the invention is obviously improved, and the product has better high temperature resistance and oxygen barrier performance, can meet the use requirement of the polyethylene cooking film, and is widely applied to the field of food packaging materials.
Description
Technical Field
The invention relates to a polyethylene cooking film, in particular to a high-temperature-resistant high-barrier polyethylene cooking film and a preparation method thereof.
Background
In recent years, people pay more and more attention to food safety. The retort pouch has been widely used because of its light weight, small volume, convenient eating, and storage at normal temperature comparable to tin cans, and the like, and the consumption mode in which the bagged food can be directly eaten after being sterilized by heating is favored. The retort pouch is subjected to high-temperature sterilization treatment at 120-135 ℃ after packaging food, so that the requirements on high temperature resistance and barrier property of the raw material film structure are high, the retort pouch is prevented from being broken by layers after being heated, oxygen is reduced in the storage process, and the quality guarantee period of the food is prolonged.
The existing steaming-resistant packaging materials are mainly divided into two types: the aluminum-plastic composite material has the advantages of good light-shielding property, temperature resistance and barrier property, but has the defects of opacity, invisible content, poor folding resistance, incapability of microwave treatment and the like; the other type is a transparent steaming-resistant composite film, which is generally prepared by compounding a plurality of polymer substrates, and common materials include polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), nylon (PA), polypropylene (PP) and the like. PVA and EVOH have good barrier properties, but have poor steaming resistance; PVDC has good barrier property and steaming resistance, but has poor hygienic processing property; PA has good mechanical properties, oxygen resistance and high-temperature steaming resistance, but amide groups are extremely easy to absorb water, so that the performance of the transparent steaming-resistant composite film is reduced; PP has higher melting point, high steaming resistance and rigidity, but has low heat sealing strength and poor toughness, and is easy to break under the low-temperature storage environment.
Along with the continuous deepening of the green environmental protection concept, recyclable materials enter the public view. Polyethylene has excellent low-temperature toughness and low heat sealing and sealing temperature, but a single polyethylene material cooking film has low temperature resistance level, high-temperature cooking is easy to soften and deform and high air permeability, and after physical or chemical modification, the heat resistance and the barrier property of the single polyethylene material cooking film are improved, so that the single polyethylene material cooking film is one of the directions of research of scientific researchers in the field of numerous cooking films at present.
Disclosure of Invention
In order to solve the technical problems, the invention firstly provides the high-temperature-resistant high-barrier polyethylene cooking film which is used for improving the defects of the existing single polyethylene material, has obviously improved rigidity, and simultaneously has better high-temperature resistance and oxygen barrier performance, can meet the use requirements of the polyethylene cooking film, and is widely applied to the field of food packaging materials.
The invention further provides a preparation method of the high-temperature-resistant high-barrier polyethylene cooking film, which can simply and efficiently prepare the polyethylene cooking film.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the high-temperature-resistant high-barrier polyethylene cooking film is prepared from the following raw materials in parts by weight:
wherein the low density polyethylene may be 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, or the like.
The high-density polyethylene may be 80 parts by weight, 85 parts by weight, 90 parts by weight, 95 parts by weight, 100 parts by weight, 105 parts by weight, or the like.
The cage polysilsesquioxane may be 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, or the like.
The ethylene-vinyl alcohol copolymer may be 5.5 parts by weight, 6 parts by weight, 6.5 parts by weight, 7 parts by weight, 7.5 parts by weight, 8 parts by weight, 8.5 parts by weight, 9 parts by weight, 9.5 parts by weight, or the like.
The irradiation crosslinking sensitizer may be 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight, 0.45 parts by weight, 0.5 parts by weight, 0.55 parts by weight, 0.6 parts by weight, 0.65 parts by weight, or 0.75 parts by weight, etc.
The compound antioxidant can be 0.13 weight part, 0.16 weight part, 0.19 weight part, 0.21 weight part, 0.24 weight part, 0.27 weight part or the like.
The invention uses high-density polyethylene and low-density polyethylene as main raw materials, adopts an electron beam irradiation crosslinking method to change the polyethylene molecules from linear molecular structures into three-dimensional net structures, and obviously improves the high temperature resistance of the polyethylene film material. On the basis, cage polysilsesquioxane is added to the raw materials in a matching way, the POSS is embedded in a polyethylene chain segment in the irradiation crosslinking process, and the bond energy of polymer decomposition is further enhanced by virtue of a silicon-oxygen bond with high bond energy, so that the heat resistance is improved; on the other hand, the inorganic cage-shaped frame can well increase the regularity and rigidity of the inner chain segments of the polyethylene material, prevent the chain segments from moving, reduce stress concentration, improve the mechanical property of the polyethylene material and realize the use or processing at the environmental temperature below 145 ℃.
As a preferred embodiment, the Low Density Polyethylene (LDPE) has a melt mass flow rate of 0.2 to 4g/10min; for example, 0.4g/10min, 0.6g/10min, 0.8g/10min, 1.0g/10min, 1.2g/10min, 1.4g/10min, 1.6g/10min, 1.8g/10min, 2.0g/10min, 2.2g/10min, 2.6g/10min, 2.8g/10min, etc.
Preferably, the low density polyethylene has a density of 0.916 to 0.930g/cm 3 For example 0.918g/cm 3 、0.920g/cm 3 、0.922g/cm 3 、0.924g/cm 3 、0.926g/cm 3 Or 0.928g/cm 3 Etc. with a weight average molecular weight of 10X 10 4 -18×10 4 g/mol, for example 11X 104g/mol, 12X 104g/mol, 13X 104g/mol, 14X 104g/mol, 15X 104g/mol, 16X 104g/mol or 17X 104g/mol, etc., and the molecular weight distribution breadth index (Mw/Mn) is 3 to 9, for example 4, 5, 6, 7 or 8, etc.
As a preferred embodiment, the high density polyethylene comprises a metallocene polyethylene (mhpe) and a non-metallocene polyethylene (HDPE), wherein the mass ratio of the metallocene polyethylene in the high density polyethylene is 40-75%, such as 40%, 50%, 55%, 60%, 65%, 70%, etc.;
preferably, the high density polyethylene is an ethylene-butene copolymer and/or an ethylene-hexene copolymer.
As a preferred embodiment, the metallocene polyethylene has a melt mass flow rate of from 0.1 to 1.2g/10min, for example 0.2g/10min, 0.3g/10min, 0.4g/10min, 0.5g/10min, 0.6g/10min, 0.7g/10min, 1.0g/10min or 1.1g/10minEqual, density of 0.945-0.955g/cm 3 For example 0.946g/cm 3 、0.947g/cm 3 、0.948g/cm 3 、0.949g/cm 3 、0.950g/cm 3 、0.951g/cm 3 、0.952g/cm 3 Or 0.954g/cm 3 Etc. with a weight average molecular weight of 20X 10 4 -30×10 4 g/mol, for example 21X 104g/mol, 22X 104g/mol, 23X 104g/mol, 24X 104g/mol, 25X 104g/mol, 26X 104g/mol, 27X 104g/mol, 28X 104g/mol or 29X 104g/mol, etc., and the molecular weight distribution breadth index is 4 to 8, for example 4.5, 5.0, 5.5, 6.0, 6.5, 7.0 or 7.5, etc.
As a preferred embodiment, the non-metallocene polyethylene has a melt mass flow rate of 5 to 20g/10min, for example 7g/10min, 9g/10min, 11g/10min, 13g/10min, 15g/10min, 17g/10min or 19g/10min, etc., and a density of 0.945 to 0.96g/cm 3 For example 0.947g/cm 3 、0.949g/cm 3 、0.951g/cm 3 、0.953g/cm 3 、0.955g/cm 3 、0.957g/cm 3 Or 0.959g/cm 3 Etc. with a weight average molecular weight of 20X 10 4 -30×10 4 g/mol, for example 21X 104g/mol, 22X 104g/mol, 23X 104g/mol, 24X 104g/mol, 25X 104g/mol, 26X 104g/mol, 27X 104g/mol, 28X 104g/mol or 29X 104g/mol, etc., and the molecular weight distribution breadth index is 20 to 30, for example 21, 22, 23, 24, 25, 26, 27, 28 or 29, etc.
As a preferred embodiment, the cage polysilsesquioxane comprises octavinyl silsesquioxane and octahydroxybutyl cage silsesquioxane; the octavinyl silsesquioxane is added, so that the silsesquioxane can be smoothly embedded into a polyethylene chain segment in the irradiation crosslinking process by virtue of the advantages of the polyvinyl, so that a cage-shaped framework is connected with various organic groups, and a large number of hydroxyl groups of the octahydroxy butyl cage-shaped silsesquioxane are favorable for crosslinking reaction with other multifunctional group components, so that the oxygen barrier performance of the material is integrally improved.
Preferably, the mass ratio of octavinyl silsesquioxane to octahydroxybutyl cage silsesquioxane is (0.5-8): 1, preferably (2-8): 1, e.g. 0.5:1, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 4:1, 5:1, 6:1, 6.5:1, 7:1.
As a preferred embodiment, the ethylene-vinyl alcohol copolymer has a molar content of ethylene of 25-35%, such as 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33% or 34%, etc.; the weight average molecular weight of the ethylene-vinyl alcohol copolymer is 15×10 4 -40×10 4 g/mol, for example, 16X 104g/mol, 19X 104g/mol, 22X 104g/mol, 25X 104g/mol, 28X 104g/mol, 31X 104g/mol, 33X 104g/mol, 36X 104g/mol, 38X 104g/mol, etc.
As a preferred embodiment, the irradiation crosslinking sensitizer is compounded by triallyl cyanurate, trimethylolpropane triacrylate and triallyl isocyanurate, and the mass ratio of the triallyl cyanurate, the trimethylolpropane triacrylate and the triallyl isocyanurate is preferably 1 (1-3): 0.5-2. For example, the mass ratio of triallyl cyanurate to trimethylolpropane triacrylate can be 1:1.2, 1:1.4, 1:1.6, 1:1.8, 1:2.0, 1:2.2, 1:2.4, 1:2.6, or 1:2.8, etc. The mass ratio of triallyl cyanurate to triallyl isocyanurate can be 1:0.6, 1:0.8, 1:1.0, 1:1.2, 1:1.4, 1:1.6, 1:1.8, or the like.
Aiming at the problem of poor barrier property of polyethylene materials, the invention further adopts the triallyl cyanurate, trimethylolpropane triacrylate and triallyl isocyanurate compound irradiation crosslinking sensitizer containing multifunctional groups on the basis of adding the ethylene-vinyl alcohol copolymer barrier materials into the raw materials, and simultaneously realizes crosslinking with unsaturated functional groups through the polyhydroxy structure of the octahydroxybutyl cage-shaped silsesquioxane, so that the interfacial compatibility and interfacial stability of the polyethylene, the cage-shaped polysilsesquioxane and the ethylene-vinyl alcohol copolymer are enhanced during irradiation processing.
As a preferable technical scheme of the invention, besides adding traditional triallyl isocyanurate as an irradiation crosslinking sensitizer in the raw materials for preparation, triallyl cyanurate and trimethylolpropane triacrylate are added to coordinate and match with the raw materials, so that the irradiation crosslinking effect is improved, and the oxygen blocking performance of the cooking film is further enhanced due to the characteristic of polyfunctional groups.
As a preferred embodiment, the antioxidant comprises a primary antioxidant and a secondary antioxidant in a mass ratio of 1 (1-3), for example, 1:1.2, 1:1.4, 1:1.6, 1:1.8, 1:2.0, 1:2.2, 1:2.4, 1:2.6 or 1:2.8, etc.;
the main antioxidant is phosphite antioxidants, preferably any one or a combination of at least two of antioxidants 633, 398, 626 and 618;
the auxiliary antioxidant is hindered phenol antioxidant, preferably any one or the combination of at least two of antioxidant 1790, antioxidant 1330 and antioxidant 736.
As a preferred technical scheme of the invention, the high-temperature-resistant and water-resistant extraction-resistant combined antioxidant is adopted in the preparation raw materials, so that the stability and heat resistance of the film of the cooking film under the condition of long-time hot water cooking can be maintained, the hydrolysis of the antioxidant is reduced, and the food safety is enhanced.
A method for preparing the high-temperature-resistant high-barrier polyethylene steamed membrane, which comprises the following steps:
adding low-density polyethylene, high-density polyethylene, cage-type polysilsesquioxane, an ethylene-vinyl alcohol copolymer, an irradiation crosslinking sensitizer and an antioxidant into a 3-5-section heating film blowing machine according to parts by weight, extruding and blowing from a film head to form a film after melting, and preparing a polyethylene film after tape casting, irradiation crosslinking, traction cooling, trimming and rolling and cutting;
preferably, the screw speed of the heating film blowing machine is 200-600rpm, such as 250rpm, 300rpm, 350rpm, 400rpm, 450rpm, 500rpm or 550rpm, etc., the barrel temperature is 165-195 ℃, such as 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃, etc., the die temperature is 180-220 ℃, such as 185 ℃, 190 ℃, 195 ℃, 200 ℃, 205 ℃, 210 ℃, 215 ℃, etc., and the blowing ratio of the film blowing machine is 1.5-3, such as 1.7, 1.9, 2.1, 2.3, 2.5, 2.7, 2.9, etc.;
preferably, the host speed during casting is 10-30m/min, such as 12m/min, 14m/min, 16m/min, 18m/min, 20m/min, 22m/min, 24m/min, 26m/min, 28m/min, etc.;
preferably, the irradiation crosslinking mode is realized by an electron beam irradiation treatment, the intensity of the electron beam irradiation treatment is 100-200kGy, such as 110kGy, 120kGy, 130kGy, 140kGy, 150kGy, 180kGy or 190kGy, etc., and the irradiation rate is 10-30kGy/s, such as 12kGy/s, 14kGy/s, 16kGy/s, 20kGy/s, 22kGy/s, 26kGy/s or 28kGy/s, etc.;
preferably, the traction cooling is performed at a traction speed of 20-30m/min, such as 21m/min, 22m/min, 23m/min, 24m/min, 25m/min, 26m/min, 27m/min, 28m/min or 29m/min, etc.;
preferably, the temperature of the sealing knife during the cutting process is 150-190 ℃, such as 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃ or the like.
Preferably, the thickness of the prepared high temperature resistant high barrier polyethylene retort film is 30-80 μm, for example 40 μm, 50 μm, 60 μm or 70 μm, etc.
Based on the third aspect of the invention, the application of the high-temperature-resistant high-barrier polyethylene cooking film in the field of food packaging is also provided.
The polyethylene cooking film provided by the invention has excellent rigidity, high temperature resistance and oxygen barrier property, can be used or processed at an ambient temperature below 145 ℃, and can be widely applied to the field of food packaging materials.
Detailed Description
The invention will now be further illustrated by means of specific examples which are given solely by way of illustration of the invention and do not limit the scope thereof.
Details of the raw materials and equipment involved in the detailed description of the invention are shown in tables 1 and 2, respectively:
TABLE 1 raw material information
Table 2, device information
| Device name | Model number | Manufacturer' s |
| Universal material testing machine | Z010TE | ZWICK |
| Electronic tensile testing machine | XLW(PC) | Labthink |
| Fat impact tester | RR/FDT-A2 Rayran | INSTRON |
| Oxygen transmission tester | OTR E-41 | LabStone |
| Micrometer thickness gauge | LS225 | Linshang |
| Film blowing machine | LF-600-COEX | Labtech |
The performance test method related in the specific embodiment part of the invention is as follows:
(1) Tensile load and tensile break nominal strain: testing according to the test method provided by GB/T1040.2-2006;
(2) Right angle tear load: testing according to a testing method provided by GB/T529-2008;
(3) Dart impact strength: the test was performed according to the test method provided in GB/T9639-2006.
(4) Oxygen transmission amount: the test was performed according to the test method provided in GB/T19789-2005.
[ example 1 ]
Raw materials for polyethylene retort films were prepared according to the following formulation:
LDPE(2420H)10kg，
mHDPE(M4707EP)50kg，
HDPE(7000F)40kg，
octavinylsilsesquioxane 6kg,
3kg of octahydroxybutyl cage silsesquioxane,
8kg of ethylene-vinyl alcohol copolymer (F171B),
0.1kg of triallyl cyanurate,
0.2kg of trimethylolpropane triacrylate,
0.1kg of triallyl isocyanurate,
398.06 kg of antioxidant, namely, 398,
1790.12 kg of antioxidant.
The prepared raw materials are added into a film blowing machine (the rotating speed of a screw is 300rpm, the temperature of a cylinder is 190 ℃), and after melt coextrusion, film formation is carried out from a film head through blow molding (the temperature of a die head is 200 ℃, the blow ratio is 2), electron beam irradiation crosslinking (the intensity of electron beam irradiation treatment is 150kGy, the irradiation rate is 20 kGy/s), tape casting molding (the speed of a host machine is 20 m/min), traction cooling (the traction speed is 25 m/min), trimming and rolling (the trimming size is 1.8 cm), and cutting processing (the temperature of a seal cutter is 170 ℃, the rolling speed is 196 rolls) are carried out, and then the polyethylene steamed film with the thickness of 60 mu m is obtained.
[ example 2 ]
Raw materials for polyethylene retort films were prepared according to the following formulation:
LDPE(2420H)6kg，
mHDPE(M4707EP)46kg，
HDPE(DGDA6098)48kg，
3kg of octavinylsilsesquioxane,
2kg of octahydroxybutyl silsesquioxane,
6kg of ethylene-vinyl alcohol copolymer (F171B),
0.1kg of triallyl cyanurate,
0.3kg of trimethylolpropane triacrylate,
0.05kg of triallyl isocyanurate,
626.06 kg of an antioxidant, namely, a water-soluble polymer,
antioxidant 1330.12 kg.
The prepared raw materials are added into a film blowing machine (the rotating speed of a screw is 300rpm, the temperature of a cylinder is 190 ℃), and after melt coextrusion, film formation is carried out from a film head through blow molding (the temperature of a die head is 210 ℃ and the blow ratio is 2.2), and after electron beam irradiation crosslinking (the intensity of electron beam irradiation treatment is 160kGy, the irradiation radiation rate is 22 kGy/s), tape casting (the speed of a host machine is 20 m/min), traction cooling (the traction speed is 25 m/min), trimming and rolling (the trimming size is 1.8 cm), and cutting (the temperature of a seal cutter is 170 ℃ and the rolling speed is 196 rolls), a polyethylene cooking film with the thickness of 60 mu m is obtained.
[ example 3 ]
Raw materials for polyethylene retort films were prepared according to the following formulation:
LDPE(2426K)14kg，
mHDPE(M4707EP)54kg，
HDPE(7000F)32kg，
7kg of octavinylsilsesquioxane,
3kg of octahydroxybutyl cage silsesquioxane,
9kg of ethylene-vinyl alcohol copolymer (F171B),
0.12kg of triallyl cyanurate,
0.24kg of trimethylolpropane triacrylate,
0.12kg of triallyl isocyanurate,
398.08 kg of antioxidant is used for preparing the composite,
antioxidant 1330.15 kg.
The prepared raw materials are added into a film blowing machine (the rotating speed of a screw is 350rpm, the temperature of a cylinder is 200 ℃) and are subjected to melt coextrusion, film formation is carried out from a film head through blow molding (the temperature of a die head is 200 ℃, the blow ratio is 2), electron beam irradiation crosslinking (the intensity of electron beam irradiation treatment is 120kGy, the irradiation rate is 15 kGy/s), tape casting molding (the speed of a host machine is 20 m/min), traction cooling (the traction speed is 25 m/min), trimming and rolling (the trimming size is 1.8 cm), and cutting processing (the temperature of a seal cutter is 170 ℃, the rolling speed is 196 rolls) are carried out, and then the polyethylene steamed film with the thickness of 60 mu m is obtained.
[ example 4 ]
Raw materials for polyethylene retort films were prepared according to the following formulation:
LDPE(2420H)10kg，
mHDPE(M5510EP)50kg，
HDPE(DGDA6098)40kg，
octavinylsilsesquioxane 6kg,
3kg of octahydroxybutyl cage silsesquioxane,
8kg of ethylene-vinyl alcohol copolymer (F171B),
0.16kg of triallyl cyanurate,
0.28kg of trimethylolpropane triacrylate,
0.2kg of triallyl isocyanurate,
398.06 kg of antioxidant, namely, 398,
antioxidant 1330.12 kg.
The prepared raw materials are added into a film blowing machine (the rotating speed of a screw is 300rpm, the temperature of a cylinder is 190 ℃), and after melt coextrusion, film formation is carried out from a film head through blow molding (the temperature of a die head is 200 ℃, the blow ratio is 2), electron beam irradiation crosslinking (the intensity of electron beam irradiation treatment is 150kGy, the irradiation rate is 20 kGy/s), tape casting molding (the speed of a host machine is 20 m/min), traction cooling (the traction speed is 25 m/min), trimming and rolling (the trimming size is 1.8 cm), and cutting processing (the temperature of a seal cutter is 170 ℃, the rolling speed is 196 rolls) are carried out, and then the polyethylene steamed film with the thickness of 60 mu m is obtained.
[ example 5 ]
Raw materials for polyethylene retort films were prepared according to the following formulation:
LDPE(2420H)14kg，
mHDPE(M5510EP)54kg，
HDPE(7000F)32kg，
8.5kg of octavinylsilsesquioxane,
1.5kg of octahydroxybutyl silsesquioxane,
9kg of ethylene-vinyl alcohol copolymer (F171B),
0.2kg of triallyl cyanurate,
0.2kg of trimethylolpropane triacrylate,
0.4kg of triallyl isocyanurate,
the antioxidant is 398.03 kg,
antioxidant 1330.07 kg.
The prepared raw materials are added into a film blowing machine (the rotating speed of a screw is 300rpm, the temperature of a cylinder is 200 ℃) and are subjected to melt coextrusion, film formation is carried out from a film head through blow molding (the temperature of a die head is 210 ℃ and the blow ratio is 3), electron beam irradiation crosslinking (the intensity of electron beam irradiation treatment is 180kGy, the irradiation rate is 25 kGy/s), tape casting molding (the speed of a host machine is 25 m/min), traction cooling (the traction speed is 30 m/min), trimming and rolling (the trimming size is 1.8 cm), and cutting processing (the temperature of a seal cutter is 170 ℃ and the rolling speed is 196 rolls) are carried out, so that the polyethylene steamed film with the thickness of 60 mu m is obtained.
[ example 6 ]
Raw materials for polyethylene retort films were prepared according to the following formulation:
LDPE(1810D)14kg，
mHDPE(M5510EP)54kg，
HDPE(7000F)32kg，
7kg of octavinylsilsesquioxane,
3kg of octahydroxybutyl cage silsesquioxane,
9kg of ethylene-vinyl alcohol copolymer (F171B),
0.12kg of triallyl cyanurate,
0.24kg of trimethylolpropane triacrylate,
0.12kg of triallyl isocyanurate,
398.08 kg of antioxidant is used for preparing the composite,
antioxidant 1330.15 kg.
The prepared raw materials are added into a film blowing machine (the rotating speed of a screw is 300rpm, the temperature of a cylinder is 190 ℃), and after melt coextrusion, film formation is carried out from a film head through blow molding (the temperature of a die head is 200 ℃, the blow ratio is 2), electron beam irradiation crosslinking (the intensity of electron beam irradiation treatment is 150kGy, the irradiation rate is 20 kGy/s), tape casting molding (the speed of a host machine is 20 m/min), traction cooling (the traction speed is 25 m/min), trimming and rolling (the trimming size is 1.8 cm), and cutting processing (the temperature of a seal cutter is 170 ℃, the rolling speed is 196 rolls) are carried out, and then the polyethylene steamed film with the thickness of 60 mu m is obtained.
[ example 7 ]
Raw materials for polyethylene retort films were prepared according to the following formulation:
LDPE(2426K)8kg，
mHDPE(M5510EP)46kg，
HDPE(DGDA6098)46kg，
octavinylsilsesquioxane 4kg,
2kg of octahydroxybutyl silsesquioxane,
8kg of ethylene-vinyl alcohol copolymer (F171B),
0.18kg of triallyl cyanurate,
0.28kg of trimethylolpropane triacrylate,
0.34kg of triallyl isocyanurate,
antioxidant 398.05 kg of the total weight of the plant,
antioxidant 1330.18 kg.
The prepared raw materials are added into a film blowing machine (the rotating speed of a screw is 350rpm, the temperature of a cylinder body is 200 ℃) and are subjected to melt coextrusion, film formation is carried out from a film head through blow molding (the temperature of a die head is 210 ℃ and the blow ratio is 2.3), electron beam irradiation crosslinking (the intensity of electron beam irradiation treatment is 200kGy, the irradiation radiation rate is 28 kGy/s), tape casting molding (the speed of a host machine is 20 m/min), traction cooling (the traction speed is 25 m/min), trimming and rolling (the trimming size is 1.8 cm), and cutting processing (the temperature of a seal cutter is 170 ℃ and the rolling speed is 196 rolls) are carried out, and then the polyethylene steamed film with the thickness of 60 mu m is obtained.
Comparative example 1
A polyethylene retort film was prepared using substantially the same formulation and process as in example 1, except that electron beam irradiation crosslinking was not performed during film formation.
Comparative example 2
A polyethylene retort film was prepared using substantially the same formulation and process as in example 1, except that no ethylene-vinyl alcohol copolymer was added.
[ comparative example 3 ]
A polyethylene retort film was prepared using substantially the same formulation and process as in example 1, except that octavinylsilsesquioxane and octahydroxybutyl cage silsesquioxane were not added.
[ comparative example 4 ]
A polyethylene retort film was prepared using substantially the same formulation and process as in example 1, except that octavinylsilsesquioxanes and octahydroxybutyl cage silsesquioxanes were replaced with 9kg of isooctyl cage silsesquioxanes.
Comparative example 5
A polyethylene retort film was prepared using substantially the same formulation and process as in example 1, except that triallyl cyanurate and trimethylolpropane triacrylate were not added.
The polyethylene retort films prepared in each example and comparative example were subjected to the performance test as shown in table 3, and the test results are as follows:
TABLE 3 Performance test results
The high-temperature-resistant high-barrier polyethylene cooking film provided by the invention has excellent rigidity, high-temperature resistance and oxygen barrier property, can still keep higher tensile load, tensile fracture nominal strain and falling standard impact strength after being cooked for 30min at the processing temperature of 130 ℃,while still maintaining a low oxygen transmission rate. Specifically: the high temperature resistant high barrier polyethylene steamed film obtained in examples 1 to 5 had a tensile strength of 49 to 60Mpa in the MD direction and 48 to 55Mpa in the TD direction before steaming; the nominal strain at break in MD is 610-790% and the nominal strain at break in TD is 620-730%; the dart impact strength is 206-246g; the oxygen transmission amount is 2-5cm 3 /(m 2 24 h.0.1 MPa). The tensile strength in MD direction is 39-51Mpa after being steamed for 30min at 130 ℃, and the tensile strength in TD direction is 37-49Mpa; the tensile fracture nominal strain in the MD direction is 520-660%, and the tensile fracture nominal strain in the TD direction is 540-620%; the dart impact strength is 172-191g; the oxygen transmission amount is 4-9cm 3 /(m 2 ·24h·0.1MPa)。
As can be seen from the test data of the high-temperature-resistant high-barrier-property polyethylene steamed films obtained in the comparative examples 1 and 5, the steamed film provided in the example 1 has higher tensile strength, nominal tensile fracture strain and falling standard impact strength, reduced oxygen permeation, still has higher performance after being steamed at 130 ℃ for 30 minutes, and the tensile strength, nominal tensile fracture strain, falling standard impact strength and oxygen permeation are obviously better than those of the comparative examples 1 to 5 under the condition that the thicknesses of the high-temperature-resistant high-barrier-property polyethylene steamed films are the same.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and additions may be made to those skilled in the art without departing from the method of the present invention, which modifications and additions are also to be considered as within the scope of the present invention.
Claims (10)
1. The high-temperature-resistant high-barrier polyethylene steamed membrane is characterized by being prepared from the following raw materials in parts by weight:
2. the high temperature and barrier resistant polyethylene retort film of claim 1, wherein the low density polyethylene has a melt mass flow rate of 0.2-4g/10min;
preferably, the low density polyethylene has a density of 0.916 to 0.930g/cm 3 A weight average molecular weight of 10X 10 4 -18×10 4 g/mol, and the molecular weight distribution breadth index is 3-9.
3. The high temperature and high barrier polyethylene retort film according to claim 2, wherein the high density polyethylene comprises a metallocene polyethylene and a non-metallocene polyethylene, wherein the mass ratio of the metallocene polyethylene in the high density polyethylene is 40-75%;
preferably, the high density polyethylene is an ethylene-butene copolymer and/or an ethylene-hexene copolymer.
4. The high temperature and high barrier polyethylene retort film according to claim 3, wherein the metallocene polyethylene has a melt mass flow rate of 0.1 to 1.2g/10min and a density of 0.945 to 0.955g/cm 3 A weight average molecular weight of 20X 10 4 -30×10 4 g/mol, and the molecular weight distribution breadth index is 4-8.
5. The high temperature and high barrier polyethylene retort film according to claim 3, wherein the non-metallocene polyethylene has a melt mass flow rate of 5 to 20g/10min and a density of 0.945 to 0.96g/cm 3 A weight average molecular weight of 20X 10 4 -30×10 4 g/mol, and the molecular weight distribution breadth index is 20-30.
6. The high temperature and barrier polyethylene retort film according to any one of claims 1-5, wherein the cage polysilsesquioxane comprises octavinyl silsesquioxane and octahydroxybutyl cage silsesquioxane;
preferably, the mass ratio of octavinyl silsesquioxane to octahydroxybutyl cage silsesquioxane is (0.5-8): 1, preferably (2-8): 1.
7. The high temperature and high barrier polyethylene retort film according to any one of claims 1 to 5, wherein the ethylene-vinyl alcohol copolymer has a molar content of ethylene of 25 to 35%; the weight average molecular weight of the ethylene-vinyl alcohol copolymer is 15×10 4 -40×10 4 g/mol。
8. The high-temperature and high-barrier polyethylene cooking film according to any one of claims 1 to 5, wherein the irradiation crosslinking sensitizer is compounded from triallyl cyanurate, trimethylolpropane triacrylate and triallyl isocyanurate, and the mass ratio of the three is preferably 1 (1-3): 0.5-2.
9. The high-temperature-resistant high-barrier polyethylene cooking film according to claim 9, wherein the antioxidant comprises a main antioxidant and an auxiliary antioxidant in a mass ratio of 1 (1-3);
the main antioxidant is phosphite antioxidants, preferably any one or a combination of at least two of antioxidants 633, 398, 626 and 618;
the auxiliary antioxidant is hindered phenol antioxidant, preferably any one or the combination of at least two of antioxidant 1790, antioxidant 1330 and antioxidant 736.
10. A method for preparing the high temperature and high barrier polyethylene retort film according to any one of claims 1 to 9, comprising the steps of:
adding low-density polyethylene, high-density polyethylene, cage-type polysilsesquioxane, an ethylene-vinyl alcohol copolymer, an irradiation crosslinking sensitizer and an antioxidant into a 3-5-section heating film blowing machine according to parts by weight, extruding and blowing from a film head to form a film after melting, and preparing a polyethylene film after tape casting, irradiation crosslinking, traction cooling, trimming and rolling and cutting;
preferably, the screw speed of the heating film blowing machine is 200-600rpm, the barrel temperature is 165-195 ℃, the die head temperature is 180-220 ℃, and the blowing ratio of the film blowing machine is 1.5-3;
preferably, the host speed is 10-30m/min during casting;
preferably, the irradiation crosslinking mode is realized through electron beam irradiation treatment, the intensity of the electron beam irradiation treatment is 100-200kGy, and the irradiation radiation rate is 10-30kGy/s;
preferably, the traction speed is 20-30m/min when the traction is cooled;
preferably, the temperature of the sealing knife during the cutting process is 150-190 ℃.
Preferably, the thickness of the prepared high-temperature-resistant high-barrier polyethylene steamed film is 30-80 mu m.
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| CN118082336A (en) * | 2024-01-29 | 2024-05-28 | 无锡恒元创新材料科技有限公司 | High-barrier food packaging film and preparation method thereof |
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