CN115612291B - Extinction polyamide film and preparation method thereof - Google Patents
Extinction polyamide film and preparation method thereof Download PDFInfo
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- CN115612291B CN115612291B CN202211393731.8A CN202211393731A CN115612291B CN 115612291 B CN115612291 B CN 115612291B CN 202211393731 A CN202211393731 A CN 202211393731A CN 115612291 B CN115612291 B CN 115612291B
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- 230000008033 biological extinction Effects 0.000 title claims abstract description 88
- 239000004952 Polyamide Substances 0.000 title claims abstract description 57
- 229920002647 polyamide Polymers 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 229920002292 Nylon 6 Polymers 0.000 claims abstract description 46
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 45
- 239000010410 layer Substances 0.000 claims abstract description 44
- 239000012792 core layer Substances 0.000 claims abstract description 36
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 32
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000012975 dibutyltin dilaurate Substances 0.000 claims abstract description 14
- 229920000728 polyester Polymers 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- -1 polypropylene carbonate Polymers 0.000 claims description 34
- 229920001903 high density polyethylene Polymers 0.000 claims description 22
- 239000004700 high-density polyethylene Substances 0.000 claims description 22
- 239000004698 Polyethylene Substances 0.000 claims description 20
- 229920000573 polyethylene Polymers 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 14
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 13
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 12
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 11
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 11
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 11
- 229920000379 polypropylene carbonate Polymers 0.000 claims description 11
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 10
- 239000003431 cross linking reagent Substances 0.000 claims description 9
- 239000003999 initiator Substances 0.000 claims description 9
- 239000004677 Nylon Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 7
- 229920001778 nylon Polymers 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 3
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 3
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 238000009998 heat setting Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 3
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 claims description 3
- IMSODMZESSGVBE-UHFFFAOYSA-N 2-Oxazoline Chemical compound C1CN=CO1 IMSODMZESSGVBE-UHFFFAOYSA-N 0.000 claims description 2
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 claims description 2
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 claims description 2
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 claims description 2
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 claims description 2
- 229920000299 Nylon 12 Polymers 0.000 claims description 2
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 2
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000178 monomer Substances 0.000 claims description 2
- 229920002961 polybutylene succinate Polymers 0.000 claims description 2
- 239000004631 polybutylene succinate Substances 0.000 claims description 2
- 229920001610 polycaprolactone Polymers 0.000 claims description 2
- 239000004632 polycaprolactone Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229920006233 biaxially oriented polyamide Polymers 0.000 abstract description 9
- 238000007789 sealing Methods 0.000 abstract description 7
- 230000004888 barrier function Effects 0.000 abstract description 5
- 239000005021 flexible packaging material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 11
- 239000002985 plastic film Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ZMKVBUOZONDYBW-UHFFFAOYSA-N 1,6-dioxecane-2,5-dione Chemical compound O=C1CCC(=O)OCCCCO1 ZMKVBUOZONDYBW-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- 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
- 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
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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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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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
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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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/416—Reflective
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- 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
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
-
- 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
-
- 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
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
-
- 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
- C08J2469/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
-
- 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
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
-
- 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
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C08K5/57—Organo-tin compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of flexible packaging materials, and particularly relates to a extinction polyamide film and a preparation method thereof. Wherein, a extinction polyamide film comprises an extinction layer, a core layer and a heat sealing layer; the extinction layer raw materials comprise 87.9-93.99% of extinction basic master batch, 3-6% of crystalline polyester, 0.01-0.1% of dibutyl tin dilaurate and 3-6% of compatilizer by mass percent; the core layer raw material comprises 100% polyamide 6; the heat-sealing raw materials comprise 95-97% of copolyamide and 3-5% of polyamide anti-sticking master batch. The extinction polyamide film provided by the invention has good barrier property and heat sealing property on the premise of having good extinction property, and simultaneously ensures that the extinction polyamide film has good mechanical property of a conventional BOPA film, so that the application range of the extinction polyamide film is expanded, and the extinction polyamide film has higher application value.
Description
Technical Field
The invention belongs to the technical field of flexible packaging materials, and particularly relates to a extinction polyamide film and a preparation method thereof.
Background
The extinction film is a plastic film with low gloss and high haze, and light rays are reflected and scattered by the extinction layer, so that the film has very low gloss similar to paper, weak and soft reflected light, high haze and high light transmittance, and has the advantages of comfortable hand feeling, elegant appearance, vivid color reproduction during printing and the like. The extinction polyamide film can build the image of a natural product in food package and gift package, and improves the grade of the product. Biaxially oriented polyamide film (BOPA film) has excellent mechanical properties, oxygen barrier properties and puncture resistance, and the BOPA film with extinction effect can be widely applied to various fields such as heavy objects, electrons, medicines and the like.
However, the common biaxially oriented polyamide has poor barrier property to water vapor and has no heat sealing property, and the like, and is usually used in combination with a cast polyethylene film or a polypropylene film. The addition of the complex process causes various environmental problems such as waste liquid treatment and the like, and simultaneously increases the cost. The prior biaxially oriented extinction polyamide film added with inorganic powder can influence the transparency of the film. The presence of polyamide films as print layers, if the transparency of the polyamide film is reduced, can lead to the occurrence of blushing after further ink jetting or color filling, especially for dark products, severely affecting the packaging grade.
Disclosure of Invention
In order to solve the problems of poor water blocking performance, insufficient transparency and incapability of heat sealing of the extinction BOPA film in the prior art, the invention provides an extinction polyamide film which comprises an extinction layer, a core layer and a heat sealing layer;
the extinction layer comprises the following components in percentage by mass: 87.9 to 93.99 percent of extinction basic master batch, 3 to 6 percent of crystalline polyester, 0.01 to 0.1 percent of dibutyl tin dilaurate and 3 to 6 percent of compatilizer;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 95-97% of copolyamide and 3-5% of polyamide anti-sticking master batch;
in one embodiment, the extinction base masterbatch comprises the following components in percentage by mass: 46 to 59.48 percent of polyamide 6, 40 to 50 percent of high-density polyethylene, 0.01 to 0.5 percent of initiator, 0.5 to 3 percent of cross-linking agent and 0.01 to 0.5 percent of antioxidant.
In one embodiment, the matting base masterbatch is prepared by:
mixing polyamide 6 and high-density polyethylene in a mixing container, and adding an antioxidant, an initiator and a crosslinking agent into the mixing container for mixing;
and (3) putting the mixed mixture into a co-rotating double-screw extruder, and performing melt extrusion, granulation and drying to obtain the composite material.
Preferably, the mixing vessel employs a low speed mixer. Specifically, the mixing time of the polyamide 6 and the high-density polyethylene in the low-speed mixer is 10-15 min, and the following antioxidant, initiator and crosslinking agent are added into the low-speed mixer and then mixed for 5-8 min, wherein the rotating speed of the low-speed mixer is 100-200 rpm.
Preferably, the drying process is drying in a dehumidifier at 80 ℃ for 4-5 hours;
preferably, the processing temperature of the homodromous double-screw extruder is 180-230 ℃, and the screw rotating speed is 250-450 rpm.
In one embodiment, the crystalline polyester is at least one of polycaprolactone, polypropylene carbonate, and polybutylene succinate.
In one embodiment, the copolyamide is formed by copolymerizing at least two monomers selected from the group consisting of nylon 6, nylon 66, nylon 10, nylon 12, nylon 1010, and nylon 1212. Preferably, the copolyamide is a terpolymer nylon. Further, the melting point range of the copolyamide is 110-130 ℃, and the temperature can be adjusted according to practical conditions by a person skilled in the art.
In one embodiment, the compatibilizer is at least one of polyethylene grafted maleic anhydride, polyethylene grafted glycidyl methacrylate, polyethylene grafted epoxy, and polyethylene grafted oxazoline.
In one embodiment, the initiator is at least one of dicumyl peroxide, di-t-butyl peroxide, cumene hydroperoxide, t-butyl hydroperoxide.
In one embodiment, the cross-linking agent is at least one of vinyltriethoxysilane, vinyltrimethoxysilane, gamma-methacryloxypropyl trimethoxysilane.
In one embodiment, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 1098, antioxidant 168, antioxidant DSTP.
In one embodiment, the thickness of the extinction layer is 1-3 μm; the thickness of the core layer is 9-19 mu m; the thickness of the heat seal layer is 1-3 mu m.
The invention also provides a preparation method for preparing the extinction polyamide film, which comprises the following steps:
respectively mixing the raw materials of the extinction layer, the core layer and the heat sealing layer according to a proportion, respectively carrying out melt extrusion, flowing out through a T-shaped die, and cooling through a chilling roller to form an unstretched film casting sheet;
step-by-step stretching is carried out on the unstretched film casting sheet to obtain a stretched film;
and (3) carrying out heat setting on the stretched film to obtain the extinction polyamide film.
Preferably, the surface temperature of the chill roll is 15 ℃ to 40 ℃.
Preferably, the temperature of the step stretching is 65-180 ℃, and the stretching multiplying power is 2.5 multiplied by 2.5-3.5 multiplied by 3.5.
Preferably, the setting temperature is 170-210 ℃, the setting time is 3-20 s, and the relaxation rate is 1-3%.
Based on the above, compared with the prior art, the invention has the following beneficial effects:
1. the extinction polyamide film provided by the invention is introduced with the high-density polyethylene material and the high-crystallinity polyester material, the initiator initiates the cross-linking agent to generate silane reaction and cross-linked polyethylene, and then the compatilizer generates compatibilization reaction, so that the water blocking performance of the extinction polyamide film is further improved, and the application range of the polyamide film is expanded.
2. The extinction polyamide film extinction layer provided by the invention can provide excellent water blocking performance and optical transmittance, the core layer provides excellent mechanical support and oxygen blocking performance, and the heat sealing layer provides good heat sealing performance, so that the extinction polyamide film provided by the invention does not need to be compounded with a cast polyolefin heat sealing layer and can be used independently, the downstream compounding process is reduced, a plurality of environmental problems such as downstream waste liquid treatment are prevented, and meanwhile, the processing cost is reduced.
3. The crystalline polyester capable of crystallizing at high speed is added into the extinction layer, the self crystallinity of the crystalline polyester can be utilized to improve the bulge effect of the film surface, the diffuse reflection effect of the film surface is increased, and the extinction performance is improved. Meanwhile, a small amount of crystalline polyester can be used as heterogeneous nucleating agent to induce the crystallization of polyamide 6 and crosslinked polyethylene, so that the extinction performance is improved. Furthermore, the introduction of the crystalline polyester can adjust the fluidity of the crosslinked high-density polyethylene resin and the polyamide resin after the compatibilization reaction.
4. The extinction layer adopts the polyethylene grafted material as the reactive compatilizer of the polyamide 6 and the high-density polyethylene, so that poor dispersion effect caused by phase separation due to incompatibility of the nonpolar high-density polyethylene and the polar polyamide is prevented, and extinction performance and mechanical property are influenced. And simultaneously, functional groups such as maleic anhydride in the compatilizer react with amino functional groups in the polyamide, a small amount of water molecules separated after the reaction react with the silane grafted high-density polyethylene resin in the dibutyl tin dilaurate catalysis basic extinction master batch to further crosslink, so that crosslinking bulges are formed, the optical diffuse reflection effect is improved, and the extinction performance is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
For a clearer description of embodiments of the invention or of the solutions of the prior art, the drawings that are needed in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art; the positional relationships described in the drawings in the following description are based on the orientation of the elements shown in the drawings unless otherwise specified.
FIG. 1 is a schematic structural view of an embodiment of a matt polyamide film provided by the invention.
Reference numerals:
100. matting layer 200 core layer 300 heat seal layer
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention; the technical features designed in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that all terms used in the present invention (including technical terms and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs and are not to be construed as limiting the present invention; it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention also provides examples and comparative examples shown in the following table:
example 1
The film structure is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 89.95% of a matting base masterbatch, 5% of polypropylene carbonate, 0.05% of dibutyltin dilaurate and 5% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 53.8% polyamide 6, 45% high density polyethylene, 0.1% dicumyl peroxide, 1 vinyltriethoxysilane, and 0.1% antioxidant 1010.
Example 2
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 87.9% of matting base masterbatch, 6% of polypropylene carbonate, 0.1% of dibutyltin dilaurate and 6% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 95% polyamide 6/66/1010 and 5% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 46% polyamide 6, 50% high density polyethylene, 0.5% dicumyl peroxide, 3% vinyltriethoxysilane, and 0.5% antioxidant 1010.
Example 3
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 93.99% of a matt base masterbatch, 3% of polypropylene carbonate, 0.01% of dibutyltin dilaurate and 3% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 97% polyamide 6/66/1010 and 3% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 59.48% polyamide 6, 40% high density polyethylene, 0.01% dicumyl peroxide, 0.5% vinyltriethoxysilane, and 0.01% antioxidant 1010.
Example 4
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 89.95% of matting base masterbatch, 5% of butylene succinate, 0.05% of dibutyltin dilaurate and 5% of polyethylene grafted glycidyl methacrylate;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1212 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 53.8% polyamide 6, 45% high density polyethylene, 0.1% di-tert-butyl peroxide, 1% vinyltrimethoxysilane and 0.1% antioxidant 1076.
Comparative example 1
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 94.95% matt base masterbatch, 0.05% dibutyltin dilaurate and 5% polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 53.8% polyamide 6, 45% high density polyethylene, 0.1% dicumyl peroxide, 1% vinyltriethoxysilane, and 0.1% antioxidant 1010.
Comparative example 2
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 90% of a matting base masterbatch, 5% of polypropylene carbonate and 5% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 53.8% polyamide 6, 45% high density polyethylene, 0.1% dicumyl peroxide, 1% vinyltriethoxysilane, and 0.1% antioxidant 1010.
Comparative example 3
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 94.95% matting base masterbatch, 5% polypropylene carbonate and 0.05% dibutyltin dilaurate;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 53.8% polyamide 6, 45% high density polyethylene, 0.1% dicumyl peroxide, 1% vinyltriethoxysilane, and 0.1% antioxidant 1010.
Comparative example 4
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 89.95% of a matting base masterbatch, 5% of polypropylene carbonate, 0.05% of dibutyltin dilaurate and 5% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 53.9% polyamide 6, 45% high density polyethylene, 1% vinyltriethoxysilane, and 0.1% antioxidant 1010.
Comparative example 5
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 89.95% of a matting base masterbatch, 5% of polypropylene carbonate, 0.05% of dibutyltin dilaurate and 5% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 54.8% of polyamide 6, 45% of high density polyethylene, 0.1% of dicumyl peroxide and 0.1% of antioxidant 1010.
Comparative example 6
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 89.95% of a matting base masterbatch, 5% of polypropylene carbonate, 0.05% of dibutyltin dilaurate and 5% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 53.9% polyamide 6, 45% high density polyethylene, 0.1% dicumyl peroxide and 1% vinyltriethoxysilane.
Comparative example 7
The structure of the film is sequentially provided with a extinction layer, a core layer and a heat sealing layer from outside to inside;
the extinction layer comprises the following components in percentage by mass: 79% of a matting base masterbatch, 10% of polypropylene carbonate, 1% of dibutyltin dilaurate and 10% of polyethylene grafted maleic anhydride;
the core layer comprises the following components in percentage by mass: 100% polyamide 6;
the heat sealing layer comprises the following components in percentage by mass: 96% polyamide 6/66/1010 and 4% polyamide release master batch.
The extinction basic master batch comprises the following components in percentage by mass: 33% of polyamide 6, 60% of high-density polyethylene, 1% of dicumyl peroxide, 5% of vinyltriethoxysilane and 1% of antioxidant 1010.
Comparative example 8
The thickness of the commercially available BOPA film was 15. Mu.m.
The above examples 1 to 4 and comparative examples 1 to 7 were each prepared by the following steps:
(1) Preparation of matt polyamide film:
respectively mixing the raw materials of the extinction layer, the core layer and the heat sealing layer according to a proportion, respectively carrying out melt extrusion through respective extruders, flowing out through a T-shaped die, and cooling through a chilled roll with the surface temperature of 35 ℃ to form an unstretched film casting sheet;
longitudinally stretching the non-stretched film casting sheet under the heating condition of 67 ℃, and then transversely stretching the non-stretched film casting sheet under the heating condition of 165 ℃ to obtain a stretched film, wherein the stretching multiplying power is 3.0 multiplied by 3.3;
and (3) carrying out heat setting on the stretched film, wherein the setting temperature is 185 ℃, the setting time is 10s, and the relaxation rate is 1%, so as to obtain the extinction polyamide film.
(2) Preparation of a matting base masterbatch:
mixing polyamide 6 and high-density polyethylene in a low-speed mixer for 10min, and adding an antioxidant, an initiator and a crosslinking agent into the low-speed mixer for 5min, wherein the rotating speed of the low-speed mixer is 100 rpm;
putting the mixed mixture into a feed hopper of a co-rotating double-screw extruder, carrying out melt extrusion and granulation, and drying in a dehumidifier at 80 ℃ for 4 hours to obtain the composite material; wherein the processing temperature of the homodromous double-screw extruder is 220 ℃, and the screw rotating speed is 300 revolutions per minute.
Each performance test was performed on each example and comparative example, and the test criteria are as follows:
average thickness: testing according to GB/T20220-2006 test Standard for average thickness, roll average thickness and unit Mass surface of Plastic film and sheet samples;
haze and light transmittance: testing according to GB/T2410-2008 'determination Standard of transmittance and haze of transparent plastics';
gloss level: testing according to GB/T8807-1988 method for testing specular gloss of plastics;
water vapor transmission rate: testing was performed according to GB/T26153-2010 "determination of Water vapor Transmission Rate of Plastic films and sheets";
oxygen transmission rate: testing according to GB/T1038-2000 method for testing gas permeability of plastic film and sheet;
heat seal strength: testing according to QB/T2538-1998 test method for heat seal Strength of Plastic film packaging bag;
tensile strength and elongation at break: according to GB/T1040.3-2006 determination of tensile Properties of Plastic film third section: test conditions for films and sheets were tested.
The results of the performance test of each example and comparative example are shown in Table 1.
TABLE 1 Performance test results
As can be seen from Table 1, the matt polyamide films produced in examples 1 to 4 have better properties than those produced in comparative examples 1 to 8. It can be seen from examples 1 to 4 and comparative examples 1 to 7 that the overall properties of the matt polyamide film provided by the invention are obtained by the proportions and the components together, and the performance requirements of the invention cannot be met under the condition that any component is missing or the proportions are disordered. As can be seen from examples 1 to 4 and comparative example 8, the matt polyamide film provided by the invention has obvious advantages compared with the existing commercial products, and has good industrial application prospect on the basis of the BOPA film, the barrier property, the heat sealing property and the matt effect.
In summary, compared with the prior art, the extinction polyamide film provided by the invention has good barrier property and heat sealing property on the premise of having good extinction property, and simultaneously ensures that the extinction polyamide film has good mechanical property of a conventional BOPA film, so that the application range of the extinction polyamide film is expanded, and the extinction polyamide film has higher application value.
In addition, it should be understood by those skilled in the art that although many problems exist in the prior art, each embodiment or technical solution of the present invention may be modified in only one or several respects, without having to solve all technical problems listed in the prior art or the background art at the same time. Those skilled in the art will understand that nothing in one claim should be taken as a limitation on that claim.
Although terms such as optical layer, core layer, heat seal layer, etc. are used more herein, the possibility of using other terms is not precluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention; the terms first, second, and the like in the description and in the claims of embodiments of the invention and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. A matt polyamide film characterized in that: comprises a extinction layer, a core layer and a heat sealing layer;
the extinction layer raw materials comprise 87.9-93.99% of extinction basic master batch, 3-6% of crystalline polyester, 0.01-0.1% of dibutyl tin dilaurate and 3-6% of compatilizer by mass percent;
the core layer raw material comprises 100% polyamide 6;
the raw materials of the heat sealing layer comprise 95-97% of copolyamide and 3-5% of polyamide anti-sticking master batch;
the extinction basic master batch comprises the following components in percentage by mass: 46 to 59.48 percent of polyamide 6, 40 to 50 percent of high-density polyethylene, 0.01 to 0.5 percent of initiator, 0.5 to 3 percent of cross-linking agent and 0.01 to 0.5 percent of antioxidant.
2. The matted polyamide film according to claim 1, characterized in that: the preparation process of the extinction basic master batch comprises the following steps:
putting polyamide 6 and high-density polyethylene into a mixing container for mixing, and then putting an antioxidant, an initiator and a crosslinking agent into the mixing container for mixing;
and (3) putting the mixed mixture into a co-rotating double-screw extruder, and performing melt extrusion, granulation and drying to obtain the composite material.
3. The matted polyamide film according to claim 1, characterized in that: the crystalline polyester is at least one of polycaprolactone, polypropylene carbonate and polybutylene succinate.
4. The matted polyamide film according to claim 1, characterized in that: the copolyamide is formed by copolymerizing at least two monomers of nylon 6, nylon 66, nylon 10, nylon 12, nylon 1010 and nylon 1212.
5. The matted polyamide film according to claim 1, characterized in that: the compatilizer is at least one of polyethylene grafted maleic anhydride, polyethylene grafted glycidyl methacrylate, polyethylene grafted epoxy and polyethylene grafted oxazoline.
6. The matted polyamide film according to claim 1, characterized in that: the initiator is at least one of dicumyl peroxide, di-tert-butyl peroxide, cumene hydroperoxide and tert-butyl hydroperoxide.
7. The matted polyamide film according to claim 1, characterized in that: the cross-linking agent is at least one of vinyl triethoxysilane, vinyl trimethoxysilane and gamma-methacryloxypropyl trimethoxysilane; the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 1098, antioxidant 168 and antioxidant DSTP.
8. The matted polyamide film according to claim 1, characterized in that: the thickness of the extinction layer is 1-3 mu m; the thickness of the core layer is 9-19 mu m; the thickness of the heat seal layer is 1-3 mu m.
9. A process for preparing a matt polyamide film as claimed in any of claims 1 to 8, characterized by the steps of:
respectively mixing the raw materials of the extinction layer, the core layer and the heat sealing layer according to a proportion, respectively carrying out melt extrusion, flowing out through a T-shaped die, and cooling through a chilling roller to form an unstretched film casting sheet;
step-by-step stretching is carried out on the unstretched film casting sheet to obtain a stretched film;
and (3) carrying out heat setting on the stretched film to obtain the extinction polyamide film.
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