CN111021086B - Environment-friendly inflatable puffed food packaging film - Google Patents
Environment-friendly inflatable puffed food packaging film Download PDFInfo
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- CN111021086B CN111021086B CN201911242461.9A CN201911242461A CN111021086B CN 111021086 B CN111021086 B CN 111021086B CN 201911242461 A CN201911242461 A CN 201911242461A CN 111021086 B CN111021086 B CN 111021086B
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- 235000013305 food Nutrition 0.000 title claims abstract description 54
- 229920006280 packaging film Polymers 0.000 title claims abstract description 48
- 239000012785 packaging film Substances 0.000 title claims abstract description 48
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000010410 layer Substances 0.000 claims abstract description 62
- 239000004814 polyurethane Substances 0.000 claims abstract description 61
- 229920002635 polyurethane Polymers 0.000 claims abstract description 61
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 50
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims abstract description 36
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 15
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 48
- 238000001035 drying Methods 0.000 claims description 42
- 238000003756 stirring Methods 0.000 claims description 33
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 32
- 229910021389 graphene Inorganic materials 0.000 claims description 29
- 239000008367 deionised water Substances 0.000 claims description 26
- 229910021641 deionized water Inorganic materials 0.000 claims description 26
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 24
- 229920002545 silicone oil Polymers 0.000 claims description 22
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 18
- 150000002009 diols Chemical class 0.000 claims description 18
- 239000004417 polycarbonate Substances 0.000 claims description 18
- 229920000515 polycarbonate Polymers 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- 239000000839 emulsion Substances 0.000 claims description 13
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 12
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 12
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 6
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 101710134784 Agnoprotein Proteins 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- 239000011698 potassium fluoride Substances 0.000 claims description 4
- 235000003270 potassium fluoride Nutrition 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 9
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 7
- 244000005700 microbiome Species 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 4
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
- 239000007789 gas Substances 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- -1 polyethylene Polymers 0.000 description 7
- 241000894006 Bacteria Species 0.000 description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 239000012528 membrane Substances 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 235000013606 potato chips Nutrition 0.000 description 6
- 230000035699 permeability Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 125000003700 epoxy group Chemical group 0.000 description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012661 block copolymerization Methods 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007142 ring opening reaction Methods 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 1
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000010101 extrusion blow moulding Methods 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 235000011888 snacks Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
- D06N3/145—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes two or more layers of polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/61—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/664—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
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- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0011—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using non-woven fabrics
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0061—Organic fillers or organic fibrous fillers, e.g. ground leather waste, wood bark, cork powder, vegetable flour; Other organic compounding ingredients; Post-treatment with organic compounds
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- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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- D06N2209/00—Properties of the materials
- D06N2209/12—Permeability or impermeability properties
- D06N2209/121—Permeability to gases, adsorption
- D06N2209/125—Non-permeable
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- D06N2209/00—Properties of the materials
- D06N2209/12—Permeability or impermeability properties
- D06N2209/126—Permeability to liquids, absorption
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Abstract
The invention discloses an environment-friendly inflatable puffed food packaging film, which comprises a wear-resistant TPU layer, a non-woven fabric layer and a heat sealing layer which are sequentially compounded, wherein the wear-resistant TPU layer is positioned on the outermost side, and the heat sealing layer is positioned on the innermost side and is in direct contact with puffed food; the heat sealing layer is made of aqueous polyurethane and modified graphene oxide, and the wear-resistant TPU layer is made of wear-resistant TPU coating. According to the invention, the non-woven fabric is used as the middle framework layer of the packaging film, and the wear-resistant TPU layer and the heat sealing layer both adopt polyurethane as main film forming substances, so that the environment-friendly requirement is met; the heat-sealing layer adopts the modified graphene oxide and the waterborne polyurethane as main raw materials, so that the heat-sealing layer not only has stronger barrier property and ensures the crisp taste of the puffed food, but also has good antibacterial property, prevents the growth of microorganisms and prolongs the shelf life of the puffed food; the wear-resistant TPU layer is used as the outermost layer, so that the surface of the puffed food is not easy to grind out small holes in the transportation process, the situations of air leakage, water inflow and the like caused by the air leakage are avoided, and the quality of the puffed food is ensured.
Description
Technical Field
The invention belongs to the technical field of food packaging, and particularly relates to an environment-friendly inflatable puffed food packaging film.
Background
At present, puffed food on the market is liked by people as a snacks, and the mode that this kind of food was used fried more is cooked, and it is crisp delicious to eat, because the characteristic of this kind of food itself can't preserve for a long time under normal environment, for preventing that this kind of food is at the packing at the in-process of storing, transporting cracked, influence product quality, mostly use gas packaging or boxed mode to preserve, and the puffed food packaging material on the market is formed by BOPP film and CPP film complex more.
The Chinese invention patent with the patent number of CN201810779277.7 discloses an inflatable packaging composite film for puffed food suitable for plateau environment and a preparation method thereof, the composite film consists of a printing layer, a barrier layer and a heat sealing layer, a solvent-free adhesive process is adopted between the layers to form the composite film, wherein the heat sealing layer is formed by three layers of polymeric film layers through co-extrusion blow molding composite molding, and the inner layer is a low-density polyethylene blend of bimodal terpolymer polyethylene; the middle layer is linear low density polyethylene; the outer layer is a composite layer of ethylene and acrylic acid copolymer, the composite packaging film can meet the pressure resistance of 80KPa, and has the advantages of flexible material and simple and easy process. However, the polyethylene resin is adopted as the main raw material, so that the polyethylene resin is still deficient in biodegradability and not in accordance with environmental protection requirements, and in addition, the barrier property cannot meet the requirements, and the original crisp mouthfeel of the puffed food is lost after the puffed food is stored for a long time, so that the shelf life of the food is usually only a few months.
Disclosure of Invention
The invention aims to provide an environment-friendly inflatable puffed food packaging film, which adopts non-woven fabrics as a middle framework layer of the packaging film, adopts polyurethane as main film forming substances for both a wear-resistant TPU layer and a heat sealing layer, and meets the requirement of environmental protection; the heat-sealing layer adopts the modified graphene oxide and the waterborne polyurethane as main raw materials, so that the heat-sealing layer has strong barrier property, can prevent moisture and gas from entering a packaging bag, ensures the hardness and crisp taste of the puffed food, has good antibacterial property, can prevent the growth of microorganisms, and prolongs the shelf life of the puffed food; through adopting wear-resisting TPU layer as the outmost of packaging film, wear resistance is good for puffed food is difficult for being ground out the aperture in the transportation in the surface, avoids the circumstances such as gas leakage intaking that arouses, and then can further protect the puffed food in the packaging film, guarantees the quality of puffed food.
The purpose of the invention can be realized by the following technical scheme:
an environment-friendly inflatable puffed food packaging film comprises a wear-resistant TPU layer, a non-woven fabric layer and a heat sealing layer which are sequentially compounded, wherein the wear-resistant TPU layer is positioned on the outermost side, and the heat sealing layer is positioned on the innermost side and is in direct contact with puffed food;
the packaging film is prepared by the following steps:
firstly, adding waterborne polyurethane into deionized water, stirring until the waterborne polyurethane is dissolved, adding modified graphene oxide, stirring at normal temperature for 20-30min, and then performing ultrasonic treatment for 10min to obtain a heat-sealing layer coating;
secondly, placing the non-woven fabric into an ethanol water solution for soaking for 180min, then transferring the non-woven fabric into an oscillator for oscillation for 60min, then repeatedly washing the non-woven fabric for 3-4 times by using deionized water, and finally drying the non-woven fabric in a blast drying oven at 60 ℃ for later use;
thirdly, coating the heat-sealing layer coating on the surface of the non-woven fabric by using a film coater, drying for 8min at normal temperature, then coating for the second time, and finally drying at 70 ℃;
fourthly, drying and dehydrating polycarbonate diol and hydroxyl silicone oil at 110 ℃ in vacuum for 1h, dissolving the polycarbonate diol and the hydroxyl silicone oil in DMF, adding ethylene glycol, stirring uniformly, adding isophorone diisocyanate under stirring at 150r/min, keeping the temperature at 70-80 ℃, reacting for 4-5h, and adding methanol to terminate the reaction to obtain wear-resistant polyurethane emulsion;
and fifthly, coating the wear-resistant polyurethane emulsion on the other surface of the non-woven fabric, keeping the temperature of 90 ℃ for 3 hours in an electric heating air blast drying oven, then heating to 120 ℃ and keeping the temperature for 2 hours to form a wear-resistant TPU layer, and naturally cooling to room temperature to obtain the packaging film.
Further, the heat-seal layer coating is prepared from 30-40 parts of waterborne polyurethane, 2-3 parts of modified graphene oxide and 20-30 parts of deionized water.
Further, the mass ratio of polycarbonate diol, hydroxyl silicone oil, ethylene glycol, isophorone diisocyanate and DMF in the preparation process of the wear-resistant polyurethane emulsion is 10:0.8-1:0.5-0.6:11-13: 30-32.
Further, the modified graphene oxide is prepared by the following method:
(1) ultrasonically dispersing 0.3g of graphene oxide in 300mL of DMF (dimethyl formamide), adding 112g of potassium fluoride and 15g of potassium iodide, uniformly stirring, heating to 100 ℃, continuously dropwise adding 40mL of epoxy chloropropane, carrying out reflux reaction for 15h, centrifuging, and repeatedly washing a product for 5-7 times by using ethanol and deionized water to obtain a slurry;
(2) 4.5g polyvinylpyrrolidone was weighed into 22mL of the slurry, magnetically stirred for 6h, and then 7.2mL of AgNO was added3And (3) quickly adding the aqueous solution into the mixed solution, stirring for 6min, heating the mixed solution to 60 ℃, preserving heat for 2d, centrifugally separating a reaction product at 8000r/min, washing with deionized water for 6-7 times, and drying in vacuum to obtain the modified graphene oxide.
Further, AgNO in step (2)3The mass concentration of the aqueous solution was 31.93/L.
The invention has the beneficial effects that:
according to the invention, the heat-sealing layer is used as the innermost layer of the packaging film and is in direct contact with puffed food, the heat-sealing layer is made of waterborne polyurethane and modified graphene oxide, epichlorohydrin reacts with-COOH on the graphene oxide, an epoxy functional group is introduced into the graphene, and the introduced epoxy group is dispersed on the surface of the graphene oxide, so that the interlayer spacing of the modified graphene oxide is increased, and the loading of nano-silver particles in subsequent treatment is facilitated; the modified graphene oxide is uniformly dispersed in the waterborne polyurethane, in the process of drying and film forming, epoxy groups enter a hydrophilic micro area of the waterborne polyurethane, and generate ring-opening reaction with-NH-, -COOH and other groups in the micro area, the modified graphene oxide generates crosslinking in the hydrophilic micro area of polyurethane molecules, hydrogen bond combination can be formed between-C ═ O and-OH on the molecules and-NH-in the polyurethane molecules, several polyurethane molecules are welded together through the modified graphene oxide, so that the molecules present a three-dimensional network structure, the compactness of the film is increased, and meanwhile, the lamellar graphene oxide can more effectively prolong the bending and winding diffusion path of gas and water molecules in the film, thereby increasing the barrier property of the film layer; the porous structure of the puffed food enables the puffed food to easily absorb water in the environment, and as the waterborne polyurethane and graphene oxide molecules in the heat sealing layer contain hydrophilic groups, the water molecules permeating inside and outside the package can be absorbed, so that the water molecules are prevented from entering the chips, and the heat sealing layer has strong barrier property, so that the outside water molecules and gas molecules are prevented from entering, so that the puffed food keeps better hardness, maintains crisp taste and can prolong the shelf life of the puffed food;
in the aspect of bacteriostasis, the graphene oxide can wrap bacteria, so that the bacteria can neither consume nutrient substances nor breed and finally die, the nano silver promotes the bacteria to die by releasing the permeability of the silver ion reinforced membrane, the graphene oxide is used as a carrier, oxygen-containing groups (such as hydroxyl, carboxyl, oxygen-containing groups and the like) rich in the surface of the graphene oxide fixedly carry easily aggregated nano silver particles on a lamellar structure, and the nano silver is dispersed and fixedly carried, so that the nano silver particles have more excellent antibacterial performance, and the graphene oxide and the nano silver have synergistic effect, so that the membrane layer has excellent bacteriostasis performance; can inhibit the growth of microorganisms, ensure the quality of the puffed food in the packaging film and prolong the shelf life;
the invention adopts the wear-resistant TPU layer as the outermost layer of the packaging film, the hydroxyl silicone oil is used for modifying polyurethane through the hydroxyl silicone oil, the hydroxyl silicone oil participates in the copolymerization reaction of the polyurethane and enters the molecular chain segment of the polyurethane, the polysiloxane chain segment is introduced, the regularity of the original soft segment is damaged, the crystallinity is reduced, meanwhile, the surface energy of the polysiloxane chain segment is obviously lower than that of the molecular chain segment of the polyurethane, therefore, the organic silicon chain segment is enriched to the surface in the film forming process, the bond energy of the Si-O bond is up to 422.5kJ/mol and is far higher than that of the C-C bond by 344.4kJ/mol, the chain segment structure is stable, and the molecular chain segment of the polyurethane at the main pole makes up the defect of weak molecular acting force among the polysiloxane chain segments through the block copolymerization mode, therefore, the surface of the wear-resistant TPU layer is not easy to be damaged by external force, the wear-resistant performance is excellent, the, the quality of food in the packaging film is affected by air leakage, water inflow and the like caused by the air leakage;
according to the invention, the non-woven fabric is used as the middle framework layer of the packaging film, and the wear-resistant TPU layer and the heat sealing layer both adopt polyurethane as main film forming substances, so that the environment-friendly requirement is met; the heat-sealing layer adopts the modified graphene oxide and the waterborne polyurethane as main raw materials, so that the heat-sealing layer has strong barrier property, can prevent moisture and gas from entering a packaging bag, ensures the hardness and crisp taste of the puffed food, has good antibacterial property, can prevent the growth of microorganisms, and prolongs the shelf life of the puffed food; through adopting wear-resisting TPU layer as the outmost of packaging film, wear resistance is good for puffed food is difficult for being ground out the aperture in the transportation in the surface, avoids the circumstances such as gas leakage intaking that arouses, and then can further protect the puffed food in the packaging film, guarantees the quality of puffed food.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An environment-friendly inflatable puffed food packaging film comprises a wear-resistant TPU layer, a non-woven fabric layer and a heat sealing layer which are sequentially compounded, wherein the wear-resistant TPU layer is positioned on the outermost side, and the heat sealing layer is positioned on the innermost side and is in direct contact with puffed food;
wherein the heat sealing layer is prepared from 30-40 parts of waterborne polyurethane, 2-3 parts of modified graphene oxide and 20-30 parts of deionized water;
the modified graphene oxide is prepared by the following method:
(1) ultrasonically dispersing 0.3g of graphene oxide in 300mL of DMF (N, N-dimethylformamide), adding 112g of potassium fluoride and 15g of potassium iodide, uniformly stirring, heating to 100 ℃, continuously dropwise adding 40mL of epoxy chloropropane, carrying out reflux reaction for 15h, centrifuging, and repeatedly washing a product for 5-7 times by using ethanol and deionized water to obtain a slurry;
(2) weighing 4.5g polyvinylpyrrolidone into 22mL of the above slurry, magnetically stirring for 6h, and then adding 7.2mLAgNO3Quickly adding an aqueous solution (with the mass concentration of 31.93/L) into the solution, stirring for 6min, heating the mixed solution to 60 ℃, preserving heat for 2d, centrifugally separating a reaction product at 8000r/min, washing with deionized water for 6-7 times, and drying in vacuum to obtain modified graphene oxide;
epoxy chloropropane reacts with-COOH on the graphene oxide, an epoxy functional group is introduced into the graphene, and the introduced epoxy group is dispersed on the surface of the graphene oxide, so that the interlayer spacing of the modified graphene oxide is increased, and the loading of nano silver particles in subsequent treatment is facilitated; the modified graphene oxide is uniformly dispersed in the waterborne polyurethane, in the process of drying and film forming, epoxy groups enter a hydrophilic micro area of the waterborne polyurethane, and generate ring-opening reaction with-NH-, -COOH and other groups in the micro area, the modified graphene oxide generates crosslinking in the hydrophilic micro area of polyurethane molecules, hydrogen bond combination can be formed between-C ═ O and-OH on the molecules and-NH-in the polyurethane molecules, several polyurethane molecules are welded together through the modified graphene oxide, so that the molecules present a three-dimensional network structure, the compactness of the film is increased, and meanwhile, the lamellar graphene oxide can more effectively prolong the bending and winding diffusion path of gas and water molecules in the film, thereby increasing the barrier property of the film layer; the porous structure of the puffed food enables the puffed food to easily absorb water in the environment, and as the waterborne polyurethane and graphene oxide molecules in the heat sealing layer contain hydrophilic groups, the water molecules permeating inside and outside the package can be absorbed, so that the water molecules are prevented from entering the chips, and the heat sealing layer has strong barrier property, so that the outside water molecules and gas molecules are prevented from entering, so that the puffed food keeps better hardness, maintains crisp taste and can prolong the shelf life of the puffed food;
in the aspect of bacteriostasis, the graphene oxide can wrap bacteria, so that the bacteria can neither consume nutrient substances nor breed and finally die, the nano silver promotes the bacteria to die by releasing the permeability of the silver ion reinforced membrane, the graphene oxide is used as a carrier, oxygen-containing groups (such as hydroxyl, carboxyl, oxygen-containing groups and the like) rich in the surface of the graphene oxide fixedly carry easily aggregated nano silver particles on a lamellar structure, and the nano silver is dispersed and fixedly carried, so that the nano silver particles have more excellent antibacterial performance, and the graphene oxide and the nano silver have synergistic effect, so that the membrane layer has excellent bacteriostasis performance; can inhibit the growth of microorganisms, ensure the quality of the puffed food in the packaging film and prolong the shelf life;
the packaging film is prepared by the following steps:
firstly, adding waterborne polyurethane into deionized water, stirring until the waterborne polyurethane is dissolved, adding modified graphene oxide, stirring at normal temperature for 20-30min, and then performing ultrasonic treatment for 10min to obtain a heat-sealing layer coating;
secondly, placing the non-woven fabric into an ethanol water solution (the mass fraction is 60%) to be soaked for 180min, then transferring the non-woven fabric into an oscillator to be oscillated for 60min to remove residual impurities on the surface of the non-woven fabric, then repeatedly washing the non-woven fabric for 3-4 times by using deionized water to remove residual ethanol, and finally drying the non-woven fabric in a blast drying oven at 60 ℃ for later use;
thirdly, coating the heat-sealing layer coating on the surface of the non-woven fabric by using a film coater, drying for 8min at normal temperature, then coating for the second time, and finally drying at 70 ℃;
fourthly, drying and dehydrating polycarbonate diol and hydroxyl silicone oil at 110 ℃ in vacuum for 1h, dissolving the polycarbonate diol and the hydroxyl silicone oil in DMF, adding ethylene glycol, stirring uniformly, adding isophorone diisocyanate under stirring at 150r/min, keeping the temperature at 70-80 ℃, reacting for 4-5h, and adding methanol (a reaction terminator) to terminate the reaction to obtain wear-resistant polyurethane emulsion;
the mass ratio of polycarbonate diol, hydroxyl silicone oil, glycol, isophorone diisocyanate and DMF is 10:0.8-1:0.5-0.6:11-13: 30-32;
fifthly, coating the wear-resistant polyurethane emulsion on the other surface of the non-woven fabric, keeping the temperature of 90 ℃ for 3 hours in an electric heating air blast drying oven, then heating to 120 ℃ and keeping the temperature for 2 hours to form a wear-resistant TPU layer, and naturally cooling to room temperature to obtain a packaging film;
hydroxyl silicone oil participates in the copolymerization reaction of polyurethane, enters a polyurethane molecular chain segment, and leads the regularity of the original soft segment to be damaged and the crystallinity to be reduced by introducing a polysiloxane chain segment, meanwhile, the surface energy of the polysiloxane chain segment is obviously lower than that of the polyurethane molecular chain segment, so that the organosilicon chain segment is enriched to the surface in the film forming process, the bond energy of Si-O bond is up to 422.5kJ/mol and is much higher than that of C-C bond 344.4kJ/mol, the chain segment structure is stable, and the main polar polyurethane molecular chain segment makes up the defect of weak molecular acting force between polysiloxane chain segments through a block copolymerization mode, therefore, the surface of the wear-resistant TPU layer is not easy to be damaged by external force, the wear-resistant performance is excellent, the wear-resistant performance of the surface layer of the packaging film is good, the surface of the puffed food is not easy to be ground into small holes in the transportation process, air leakage, water inflow and the like are caused, and the quality of the food in the packaging film is influenced.
Example 1
The modified graphene oxide is prepared by the following method:
(1) ultrasonically dispersing 0.3g of graphene oxide in 300mL of DMF (N, N-dimethylformamide), adding 112g of potassium fluoride and 15g of potassium iodide, uniformly stirring, heating to 100 ℃, continuously dropwise adding 40mL of epoxy chloropropane, carrying out reflux reaction for 15h, centrifuging, and repeatedly washing a product for 5-7 times by using ethanol and deionized water to obtain a slurry;
(2) 4.5g polyvinylpyrrolidone was weighed into 22mL of the slurry, magnetically stirred for 6h, and then 7.2mL of AgNO was added3And (3) quickly adding an aqueous solution (with the mass concentration of 31.93/L) into the solution, stirring for 6min, heating the mixed solution to 60 ℃, preserving the heat for 2d, centrifugally separating a reaction product at 8000r/min, washing with deionized water for 6-7 times, and drying in vacuum to obtain the modified graphene oxide.
Comparative example 1
The slurry obtained in step (1) of example 1 was freeze-dried to obtain graphene oxide.
Comparative example 2
Graphene oxide without any treatment was subjected to the procedure of step (2) in example 1 to obtain silver-supported graphene oxide.
Example 2
An environment-friendly inflatable puffed food packaging film comprises a wear-resistant TPU layer, a non-woven fabric layer and a heat sealing layer which are sequentially compounded;
the packaging film is prepared by the following steps:
firstly, adding waterborne polyurethane into deionized water, stirring until the waterborne polyurethane is dissolved, adding modified graphene oxide, stirring at normal temperature for 20min, and then performing ultrasonic treatment for 10min to obtain a heat-sealing layer coating;
the heat-sealing layer coating is prepared from 30 parts of waterborne polyurethane, 2 parts of modified graphene oxide and 20 parts of deionized water;
secondly, placing the non-woven fabric into an ethanol water solution (the mass fraction is 60%) to be soaked for 180min, then transferring the non-woven fabric into an oscillator to be oscillated for 60min to remove residual impurities on the surface of the non-woven fabric, then repeatedly washing the non-woven fabric for 3 times by using deionized water to remove residual ethanol, and finally drying the non-woven fabric in a blast drying oven at 60 ℃ for later use;
thirdly, coating the heat-sealing layer coating on the surface of the non-woven fabric by using a film coater, drying for 8min at normal temperature, then coating for the second time, and finally drying at 70 ℃;
fourthly, drying and dehydrating polycarbonate diol and hydroxyl silicone oil at 110 ℃ in vacuum for 1h, dissolving the polycarbonate diol and the hydroxyl silicone oil in DMF, adding ethylene glycol, stirring uniformly, adding isophorone diisocyanate under stirring at 150r/min, keeping the temperature at 70 ℃, reacting for 4h, and adding methanol to terminate the reaction to obtain wear-resistant polyurethane emulsion;
the mass ratio of polycarbonate diol to hydroxyl silicone oil to glycol to isophorone diisocyanate to DMF is 10:0.8:0.5:11: 30;
and fifthly, coating the wear-resistant polyurethane emulsion on the other surface of the non-woven fabric, keeping the temperature of 90 ℃ for 3 hours in an electric heating air blast drying oven, then heating to 120 ℃ and keeping the temperature for 2 hours to form a wear-resistant TPU layer, and naturally cooling to room temperature to obtain the packaging film.
Example 3
An environment-friendly inflatable puffed food packaging film comprises a wear-resistant TPU layer, a non-woven fabric layer and a heat sealing layer which are sequentially compounded;
the packaging film is prepared by the following steps:
firstly, adding waterborne polyurethane into deionized water, stirring until the waterborne polyurethane is dissolved, adding modified graphene oxide, stirring at normal temperature for 25min, and then performing ultrasonic treatment for 10min to obtain a heat-sealing layer coating;
the heat-sealing layer coating is prepared from 35 parts of waterborne polyurethane, 2.5 parts of modified graphene oxide and 25 parts of deionized water;
secondly, placing the non-woven fabric into an ethanol water solution (the mass fraction is 60%) to be soaked for 180min, then transferring the non-woven fabric into an oscillator to be oscillated for 60min to remove residual impurities on the surface of the non-woven fabric, then repeatedly washing the non-woven fabric for 3-4 times by using deionized water to remove residual ethanol, and finally drying the non-woven fabric in a blast drying oven at 60 ℃ for later use;
thirdly, coating the heat-sealing layer coating on the surface of the non-woven fabric by using a film coater, drying for 8min at normal temperature, then coating for the second time, and finally drying at 70 ℃;
fourthly, drying and dehydrating polycarbonate diol and hydroxyl silicone oil at 110 ℃ in vacuum for 1h, dissolving the polycarbonate diol and the hydroxyl silicone oil in DMF (dimethyl formamide), adding ethylene glycol, stirring uniformly, adding isophorone diisocyanate under stirring at 150r/min, keeping the temperature at 75 ℃, reacting for 4.5h, and adding methanol to terminate the reaction to obtain wear-resistant polyurethane emulsion;
the mass ratio of polycarbonate diol to hydroxyl silicone oil to glycol to isophorone diisocyanate to DMF is 10:0.9:0.55:12: 31;
and fifthly, coating the wear-resistant polyurethane emulsion on the other surface of the non-woven fabric, keeping the temperature of 90 ℃ for 3 hours in an electric heating air blast drying oven, then heating to 120 ℃ and keeping the temperature for 2 hours to form a wear-resistant TPU layer, and naturally cooling to room temperature to obtain the packaging film.
Example 4
An environment-friendly inflatable puffed food packaging film comprises a wear-resistant TPU layer, a non-woven fabric layer and a heat sealing layer which are sequentially compounded;
the packaging film is prepared by the following steps:
firstly, adding waterborne polyurethane into deionized water, stirring until the waterborne polyurethane is dissolved, adding modified graphene oxide, stirring at normal temperature for 30min, and then performing ultrasonic treatment for 10min to obtain a heat-sealing layer coating;
the heat-sealing layer coating is prepared from 40 parts of waterborne polyurethane, 3 parts of modified graphene oxide and 30 parts of deionized water;
secondly, placing the non-woven fabric into an ethanol water solution (the mass fraction is 60%) to be soaked for 180min, then transferring the non-woven fabric into an oscillator to be oscillated for 60min to remove residual impurities on the surface of the non-woven fabric, then repeatedly washing the non-woven fabric for 4 times by using deionized water to remove residual ethanol, and finally drying the non-woven fabric in a blast drying oven at the temperature of 60 ℃ for later use;
thirdly, coating the heat-sealing layer coating on the surface of the non-woven fabric by using a film coater, drying for 8min at normal temperature, then coating for the second time, and finally drying at 70 ℃;
fourthly, drying and dehydrating polycarbonate diol and hydroxyl silicone oil at 110 ℃ in vacuum for 1h, dissolving the polycarbonate diol and the hydroxyl silicone oil in DMF, adding ethylene glycol, stirring uniformly, adding isophorone diisocyanate under stirring at 150r/min, keeping the temperature at 80 ℃, reacting for 5h, and adding methanol to terminate the reaction to obtain wear-resistant polyurethane emulsion;
the mass ratio of polycarbonate diol to hydroxyl silicone oil to glycol to isophorone diisocyanate to DMF is 10:1:0.6:13: 32;
and fifthly, coating the wear-resistant polyurethane emulsion on the other surface of the non-woven fabric, keeping the temperature of 90 ℃ for 3 hours in an electric heating air blast drying oven, then heating to 120 ℃ and keeping the temperature for 2 hours to form a wear-resistant TPU layer, and naturally cooling to room temperature to obtain the packaging film.
Comparative example 3
The graphene oxide prepared in comparative example 1 was used, and the rest was the same as in example 2.
Comparative example 4
The graphene oxide prepared in comparative example 2 was used, and the rest was the same as in example 2.
Comparative example 5
The remainder of the example 2 was the same as in example 2 except that modified graphene oxide was not added to the heat seal layer.
Comparative example 6
The wear resistant TPU layer was coated with a conventional TPU, as in example 2.
The following performance tests were performed on the packaging films obtained in examples 2 to 4 and comparative examples 3 to 6:
testing the oxygen transmission rate according to the national standard GBT 1038-2000; the moisture permeability is tested according to GB 1037-1988; testing the friction coefficient of the wear-resistant TPU layer by GB 10006-88; taking 10g of freshly puffed potato chips which are just fried, packaging the fresh puffed potato chips by using the packaging films prepared in the examples 2-4 and the comparative examples 3-6 respectively in a three-edge sealing mode, storing the fresh puffed potato chips in the same environment, and measuring the weight loss and sensory evaluation conditions of the fresh puffed potato chips after 4d and 8d respectively, wherein 10 of the sensory evaluation is full, and the taste, hardness and color of the potato chips are optimal, and the test results are as follows:
it can be seen that the packaging films obtained in examples 2 to 4 had oxygen transmittances of 250.6 to 250.9cm3/(m2d.Pa) and the moisture permeability of 0.69 to 0.70 g/(m)2D) shows that the packaging film prepared by the invention has lower oxygen transmission rate and moisture transmission rate, and shows that the packaging film has high barrier property; compared with comparative example 4, the graphene oxide which is not pre-modified in the step (1) is weak in combination with the membrane substrate, cannot form more cross-linked or hydrogen bond structures, and affects the compactness of the membrane layer, and further affects the oxygen transmission rate and the moisture permeability; the packaging films obtained in examples 2-4 were used to package potato chips with a hardness of 2.83-2.84 x 10 after 4 days5Pa, 8d post-hardness of 2.80-2.81 x 105Pa, little change in hardness, indicating good barrier properties, and a total number of colonies after 4 days of 2.0-2.1 x 104CFU·g-1And the total number of colonies after 8 days is 9.1-9.2 x 104CFU·g-1The number of colonies is small, which indicates that the packaging film prepared by the invention has good antibacterial performance, and compared with comparative example 4, indicates that the pre-modified graphene oxide not subjected to the step (1) is not beneficial to the deposition of the subsequent nano silver, so that the antibacterial effect is influenced; compared with the comparative example 5, the film layer without the graphene oxide is poor in barrier property, and the quality of the puffed food is affected; the friction coefficient of the wear-resistant TPU of the outer layer of the packaging film prepared in the examples 2-4 is 0.168-0.170, and compared with the friction coefficient of the wear-resistant TPU of the outer layer of the packaging film prepared in the comparative example 6, the wear-resistant TPU of the outermost layer can be effectively improved through the modified polyurethane, and the wear in the transportation process can be effectively reduced.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (2)
1. An environment-friendly inflatable puffed food packaging film is characterized by comprising a wear-resistant TPU layer, a non-woven fabric layer and a heat sealing layer which are sequentially compounded, wherein the wear-resistant TPU layer is positioned on the outermost side, and the heat sealing layer is positioned on the innermost side and is in direct contact with puffed food;
the packaging film is prepared by the following steps:
firstly, adding waterborne polyurethane into deionized water, stirring until the waterborne polyurethane is dissolved, adding modified graphene oxide, stirring at normal temperature for 20-30min, and then performing ultrasonic treatment for 10min to obtain a heat-sealing layer coating;
secondly, placing the non-woven fabric into an ethanol water solution for soaking for 180min, then transferring the non-woven fabric into an oscillator for oscillation for 60min, then repeatedly washing the non-woven fabric for 3-4 times by using deionized water, and finally drying the non-woven fabric in a blast drying oven at 60 ℃ for later use;
thirdly, coating the heat-sealing layer coating on the surface of the non-woven fabric by using a film coater, drying for 8min at normal temperature, then coating for the second time, and finally drying at 70 ℃;
fourthly, drying and dehydrating polycarbonate diol and hydroxyl silicone oil at 110 ℃ in vacuum for 1h, dissolving the dried polycarbonate diol and hydroxyl silicone oil in DMF, adding ethylene glycol, stirring uniformly, adding isophorone diisocyanate under stirring at 150r/min, keeping the temperature at 70-80 ℃, reacting for 4-5h, and adding methanol to terminate the reaction to obtain wear-resistant polyurethane emulsion, wherein the mass ratio of the polycarbonate diol to the hydroxyl silicone oil to the ethylene glycol to the isophorone diisocyanate to the DMF is 10:0.8-1:0.5-0.6:11-13: 30-32;
fifthly, coating the wear-resistant polyurethane emulsion on the other surface of the non-woven fabric, keeping the temperature of 90 ℃ for 3 hours in an electric heating air blast drying oven, then heating to 120 ℃ and keeping the temperature for 2 hours to form a wear-resistant TPU layer, and naturally cooling to room temperature to obtain a packaging film;
wherein in the first step, the modified graphene oxide is prepared by the following method:
(1) ultrasonically dispersing 0.3g of graphene oxide in 300mL of DMF (dimethyl formamide), adding 112g of potassium fluoride and 15g of potassium iodide, uniformly stirring, heating to 100 ℃, continuously dropwise adding 40mL of epoxy chloropropane, carrying out reflux reaction for 15h, centrifuging, and repeatedly washing a product for 5-7 times by using ethanol and deionized water to obtain a slurry;
(2) 4.5g polyvinylpyrrolidone was weighed into 22mL of the slurry, magnetically stirred for 6h, and then 7.2mL of AgNO was added3And (3) quickly adding the aqueous solution into the mixed solution, stirring for 6min, heating the mixed solution to 60 ℃, preserving heat for 2d, centrifugally separating a reaction product at 8000r/min, washing with deionized water for 6-7 times, and drying in vacuum to obtain the modified graphene oxide.
2. The environment-friendly inflatable and expandable food packaging film as claimed in claim 1, wherein the heat-sealing layer coating is prepared from 30-40 parts of waterborne polyurethane, 2-3 parts of modified graphene oxide and 20-30 parts of deionized water.
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| CN112341934A (en) * | 2020-10-20 | 2021-02-09 | 中国科学院长春应用化学研究所 | Application of corn protein liquid as gas-barrier material of air-filling material or membrane material |
| CN113772249A (en) * | 2021-09-22 | 2021-12-10 | 苏州融志信新材料有限公司 | Naturally degradable non-woven fabric packaging bag and manufacturing method thereof |
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