CN114539657A - Food packaging bag and preparation method thereof - Google Patents
Food packaging bag and preparation method thereof Download PDFInfo
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- CN114539657A CN114539657A CN202210175009.0A CN202210175009A CN114539657A CN 114539657 A CN114539657 A CN 114539657A CN 202210175009 A CN202210175009 A CN 202210175009A CN 114539657 A CN114539657 A CN 114539657A
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- packaging bag
- food packaging
- casein
- chitin
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 61
- 235000013305 food Nutrition 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229920002101 Chitin Polymers 0.000 claims abstract description 30
- 239000005018 casein Substances 0.000 claims abstract description 29
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 235000021240 caseins Nutrition 0.000 claims abstract description 29
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002159 nanocrystal Substances 0.000 claims abstract description 22
- 239000002121 nanofiber Substances 0.000 claims abstract description 22
- 235000013336 milk Nutrition 0.000 claims abstract description 15
- 239000008267 milk Substances 0.000 claims abstract description 15
- 210000004080 milk Anatomy 0.000 claims abstract description 15
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 12
- 239000000314 lubricant Substances 0.000 claims abstract description 12
- 239000012745 toughening agent Substances 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004698 Polyethylene Substances 0.000 claims abstract description 9
- -1 polyethylene Polymers 0.000 claims abstract description 9
- 229920000573 polyethylene Polymers 0.000 claims abstract description 9
- 239000002699 waste material Substances 0.000 claims abstract description 7
- 239000013078 crystal Substances 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 26
- 239000002244 precipitate Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000002023 wood Substances 0.000 claims description 11
- 241000238424 Crustacea Species 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 239000001913 cellulose Substances 0.000 claims description 7
- 229920002678 cellulose Polymers 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- 241000238557 Decapoda Species 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical group [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920000307 polymer substrate Polymers 0.000 claims description 6
- 239000012460 protein solution Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- ZCUJYXPAKHMBAZ-UHFFFAOYSA-N 2-phenyl-1h-imidazole Chemical compound C1=CNC(C=2C=CC=CC=2)=N1 ZCUJYXPAKHMBAZ-UHFFFAOYSA-N 0.000 claims description 3
- ULKLGIFJWFIQFF-UHFFFAOYSA-N 5K8XI641G3 Chemical compound CCC1=NC=C(C)N1 ULKLGIFJWFIQFF-UHFFFAOYSA-N 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 3
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 229960000583 acetic acid Drugs 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 239000007900 aqueous suspension Substances 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 159000000007 calcium salts Chemical class 0.000 claims description 3
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 3
- 235000013539 calcium stearate Nutrition 0.000 claims description 3
- 239000008116 calcium stearate Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 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
- 238000001914 filtration Methods 0.000 claims description 3
- 239000012362 glacial acetic acid Substances 0.000 claims description 3
- 238000010335 hydrothermal treatment Methods 0.000 claims description 3
- 235000019359 magnesium stearate Nutrition 0.000 claims description 3
- 150000007522 mineralic acids Chemical class 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- YOCHOHIOBBCVFR-UHFFFAOYSA-N 3-tert-butyl-2,2-dimethyloctane Chemical compound CCCCCC(C(C)(C)C)C(C)(C)C YOCHOHIOBBCVFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000005238 degreasing Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 5
- 229920006280 packaging film Polymers 0.000 abstract description 4
- 239000012785 packaging film Substances 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000007789 gas Substances 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract 1
- 229920002472 Starch Polymers 0.000 description 5
- 239000008107 starch Substances 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 230000000844 anti-bacterial effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229920005615 natural polymer Polymers 0.000 description 4
- 239000005909 Kieselgur Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N methyl pentane Natural products CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 235000014347 soups Nutrition 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920002261 Corn starch Polymers 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical group CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008176 lyophilized powder Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 235000021485 packed food Nutrition 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- 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
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/463—Edible packaging materials
-
- 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
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging materials
-
- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
-
- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/048—Forming gas barrier coatings
-
- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/10—Copolymers of styrene with conjugated dienes
-
- 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
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives 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
- C08J2489/00—Characterised by the use of proteins; Derivatives 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
- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Wrappers (AREA)
- Packages (AREA)
Abstract
The invention discloses a food packaging bag and a preparation method thereof, wherein the food packaging bag comprises, by weight, 124-145 parts of polyethylene, 65-75 parts of lignocellulose nanocrystals, 65-80 parts of chitin nanofibers, 27-34 parts of casein, 20-25 parts of kieselguhr, 8-13 parts of glycerol, 5-8 parts of a lubricant, 1-2.5 parts of a cross-linking agent and 0.5-1.5 parts of a toughening agent. Because of the existence of the nano-crystal, gas molecules are difficult to penetrate through the solid crystal, the permeability is greatly reduced, and a layer of casein film which can effectively inhibit oxygen permeation is formed on the surface of the food packaging bag by matching with casein extracted from the waste milk in the period or the expiration, so that the food packaging bag can effectively prevent food from putrefaction and deterioration, and the packaging film can be directly eaten.
Description
Technical Field
The invention relates to the technical field of packaging bags, in particular to a food packaging bag and a preparation method thereof.
Background
In modern life, food is convenient to keep fresh and store, so that a food packaging bag is produced. The food packaging bag refers to a film container which is directly contacted with food and is used for containing and protecting the food. With the continuous improvement of living standard of people, the takeaway industry is gradually started, and food packaging bags are applied more and more, so that people put forward higher requirements on the performance and the application of the food packaging bags while pursuing the basic practical value of the food packaging bags.
In the prior art, for example, Chinese patent numbers are: CN 108978332A "preparation method of an environment-friendly food packaging bag", includes the following steps: (1) taking a packaging bag body, and forming an air hole in the packaging bag body; (2) adding an ethanol solution with the volume concentration of 20% into the antibacterial starch paste, stirring, and adjusting to be proper in viscosity; (3) drying the surface of the packaging bag body, and coating the antibacterial starch paste diluted in the step (1) on the packaging bag body; (4) treating the packaging bag treated in the step (3) at 50 ℃ for 30min, gradually heating to 220 ℃, and drying to obtain an environment-friendly food packaging bag; the packaging bag provided by the invention takes the paper packaging bag as a substrate, the antibacterial starch paste is coated on the paper packaging bag, the starch paste uses corn starch as a main raw material, and the silicon dioxide aerogel and the nano titanium dioxide complex are added, so that the strength of the starch paste can be obviously improved, and the wear resistance and antibacterial performance of the material can be obviously improved.
However, in the prior art, in order to pursue the environmental protection of the food packaging bag, a packaging film made of natural polymers from plants is used purely, and although the material is very environment-friendly, the natural polymer material has no thermoplasticity, has processing difficulty and poor forming capability, so that the packaging bag has low water resistance and tensile strength and strong permeability, and is easy to spill food oil soup, thereby failing to achieve practical effects.
We have therefore proposed a food packaging bag and a method for preparing the same so as to solve the problems set forth above.
Disclosure of Invention
The invention aims to provide a food packaging bag and a preparation method thereof, aiming at solving the problems that the packaging bag and the preparation method thereof provided by the background technology are used for pursuing the environmental protection of the food packaging bag, and a packaging film made of natural polymers from plants is purely utilized, although the material is very environment-friendly, the natural polymer material has no thermoplasticity, has processing difficulty and poor forming capability, so that the water resistance and the tensile strength of the packaging bag are not high, the permeability is strong, and food oil soup is easy to spill, thereby not reaching the practical effect.
In order to achieve the purpose, the invention provides the following technical scheme: a food packaging bag comprising: 124-145 parts of polyethylene, 65-75 parts of lignocellulose nanocrystals, 65-80 parts of chitin nanofibers, 27-34 parts of casein, 20-25 parts of diatomite, 8-13 parts of glycerol, 5-8 parts of lubricant, 1-2.5 parts of cross-linking agent and 0.5-1.5 parts of toughening agent.
Preferably, the lubricant is magnesium stearate or calcium stearate.
Preferably, the cross-linking agent is one or more of vinyl trimethoxy silicon, di-tert-butyl peroxy hexane, 2-ethyl-4 methyl imidazole and 2-phenyl imidazole.
Preferably, the toughening agent is a styrene-butadiene copolymer.
The preparation method of the food packaging bag comprises the following steps:
s1, obtaining lignocellulose nanocrystals from wood, bamboo or straws;
s2, extracting chitin nano-fibers from the carapace of crustaceans, wherein the crustaceans comprise crabs and shrimps;
s3, preparing a polymer substrate;
s4, mixing and suspending the lignocellulose nanocrystals and the chitin nanofibers in water, and spraying the solution on the surface of the polymer substrate in the alternating layers;
s5, extracting casein from milk, spraying the casein onto the surface of the polymer base material in an atomizing manner, and drying for 15-30min at the temperature of 60-75 ℃.
Preferably, the method for obtaining the lignocellulose nanocrystals comprises the following steps:
s10, smashing the wood raw material until the particle size is less than or equal to 80 meshes to obtain wood chips;
s11, adding the sawdust into a sulfuric acid solution of 0.075-0.2 mol/L to obtain a slurry, carrying out hydrothermal treatment on the slurry at 150-180 ℃ for 40-80min, and carrying out solid-liquid separation to obtain a treatment solution;
s12, carrying out centrifugal separation on the treatment liquid, wherein the obtained lower-layer precipitate is cellulose crystals.
Preferably, the extraction of chitin nanofibers comprises the steps of:
s20, crushing the crustacean to be below 120 meshes to obtain chitin powder;
s21, heating the chitin powder in water bath or oil bath at 60-80 ℃ by using 2-3mol/L low-concentration inorganic acid solution, adding the chitin powder, and stirring at low speed until full acidolysis is performed to obtain acidolysis suspension;
s22, centrifuging the acidolysis suspension at a high speed, taking the precipitate, washing the precipitate with water, and dispersing the precipitate in water again to obtain a dispersion liquid;
s23, carrying out ultrasonic crushing on the dispersion liquid to obtain the chitin nanofiber aqueous suspension.
Preferably, the preparation of the polymeric substrate comprises the steps of:
s30, putting the polyethylene, the diatomite, the glycerol, the lubricant, the cross-linking agent and the toughening agent into a high-speed mixer, and mixing for 25-35 min;
s31, performing physical and chemical reactions on the mixed materials through a single-screw extruder with the temperature controlled at 180-220 ℃ and the screw rotating speed controlled at 30-50r/min, and performing longitudinal stretching, transverse stretching and traction;
and S32, discharging and cutting to obtain the polymer base material.
Preferably, the casein extraction from milk comprises the following steps:
s50, taking the waste milk, placing the waste milk at 4 ℃, centrifugally degreasing for 15-30min, and slowly adjusting the pH of the degreased milk to 4.5-4.7 by adopting 0.1mol/L glacial acetic acid;
s51, standing for 0.5-1h, filtering and precipitating, and freeze-drying to obtain crude casein freeze-dried powder;
s52, preparing a 2% protein solution from the crude casein freeze-dried powder, slowly adjusting the pH of the protein solution to 7.0-7.5 by using 0.5mol/L ammonia water solution, adding a divalent soluble calcium salt according to the proportion of 0.03-0.09mol/L, and centrifuging to retain a supernatant and a precipitate;
s53, dissolving the precipitate in 0.03-0.09mol/L disodium ethylene diamine tetraacetate solution, dialyzing, and freeze-drying to obtain the casein.
Compared with the prior art, the invention has the beneficial effects that:
the food packaging bag prepared by the invention has the advantages that the cellulose nanocrystals extracted from wood and the chitin nanofibers extracted from crab shells are suspended in water, then the solution is sprayed on the polymer base material in the alternating layers, the cellulose nanocrystals with negative charges and the chitin nanofibers with positive charges have good bonding performance, the obtained transparent film has high flexibility and tensile strength, gas molecules are difficult to penetrate through the solid crystals due to the existence of the nanocrystals, the permeability is greatly reduced, and a casein film which can effectively inhibit oxygen permeation is formed on the surface of the food packaging bag by matching with casein extracted from temporary or expired waste milk, so that the food packaging bag can effectively prevent food spoilage, can be directly eaten, has improved cleanness of internally packaged food compared with the traditional packaging bag, and can be quickly biodegraded after being discarded, is more environment-friendly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1
The invention provides a technical scheme that: the food packaging bag comprises the following raw materials in parts by weight: 145 parts by weight of polyethylene, 75 parts by weight of lignocellulose nanocrystals, 80 parts by weight of chitin nanofibers, 34 parts by weight of casein, 25 parts by weight of diatomaceous earth, 13 parts by weight of glycerol, 8 parts by weight of a lubricant, 2.5 parts by weight of a cross-linking agent, and 1.5 parts by weight of a toughening agent; the lubricant is magnesium stearate or calcium stearate, the cross-linking agent is one or more of vinyl trimethoxy silicon, di-tert-butyl hexane peroxide, 2-ethyl-4-methylimidazole and 2-phenylimidazole, and the toughening agent is a styrene-butadiene copolymer.
The preparation method of the food packaging bag is characterized by comprising the following steps:
step one, obtaining lignocellulose nanocrystals from wood, bamboo or straws:
10) crushing the wood raw material until the grain diameter is less than or equal to 80 meshes to obtain wood chips;
11) adding the sawdust into a 0.2mol/L sulfuric acid solution to obtain a slurry, carrying out hydrothermal treatment on the slurry at 180 ℃ for 80min, and carrying out solid-liquid separation to obtain a treatment solution;
12) and carrying out centrifugal separation on the treatment liquid, wherein the obtained lower-layer precipitate is a cellulose crystal.
Step two, extracting chitin nano fibers from the carapace of crustaceans, wherein the crustaceans comprise crabs and shrimps:
20) pulverizing the crustacean to be below 120 meshes to obtain chitin powder;
21) heating 2-3mol/L low-concentration inorganic acid solution in water bath or oil bath at 60-80 deg.C, adding chitin powder, stirring at low speed for full acidolysis to obtain acidolysis suspension;
22) centrifuging the acidolysis suspension at a high speed, taking the precipitate, washing with water, and dispersing in water again to obtain a dispersion solution;
23) and carrying out ultrasonic crushing on the dispersion liquid to obtain the chitin nano-fiber aqueous suspension.
Step three, preparing a polymer base material:
30) putting polyethylene, diatomite, glycerol, a lubricant, a cross-linking agent and a toughening agent into a high-speed mixer, and mixing for 25-35 min;
31) carrying out physical and chemical reaction on the mixed materials through a single screw extruder with the temperature controlled at 180-220 ℃ and the screw rotating speed controlled at 30-50r/min, longitudinal stretching, transverse stretching and traction;
32) and discharging and cutting to obtain the polymer base material.
And step four, mixing and suspending the lignocellulose nanocrystals and the chitin nanofibers in water, and spraying the solution on the surface of the polymer substrate in the alternating layers.
Step five, extracting casein from milk, spraying the casein onto the surface of the polymer base material in an atomizing manner, drying the casein at the temperature of 60-75 ℃ for 15-30 min:
50) centrifuging and defatting the waste milk at 4 deg.C for 30min, and slowly adjusting pH of the defatted milk to 4.5-4.7 with 0.1mol/L glacial acetic acid;
51) standing for 1h, filtering, precipitating, and lyophilizing to obtain crude casein lyophilized powder;
52) preparing the crude casein freeze-dried powder into a 2% protein solution, slowly adjusting the pH of the protein solution to 7.0-7.5 by using 0.5mol/L ammonia water solution, adding a divalent soluble calcium salt according to the proportion of 0.09mol/L, and centrifuging to retain a supernatant and a precipitate;
53) and dissolving the precipitate in 0.09mol/L disodium ethylene diamine tetraacetate solution, dialyzing, and freeze-drying to obtain the casein.
Example 2
The food packaging bag and the preparation method thereof provided by the embodiment are substantially the same as those of the embodiment 1, and the main differences are as follows: the feed comprises the following raw materials in parts by weight: 124 parts by weight of polyethylene, 65 parts by weight of lignocellulose nanocrystals, 65 parts by weight of chitin nanofibers, 27 parts by weight of casein, 20 parts by weight of diatomaceous earth, 8 parts by weight of glycerol, 5 parts by weight of a lubricant, 1 part by weight of a crosslinking agent, and 0.5 part by weight of a toughening agent.
Example 3
The food packaging bag and the preparation method thereof provided by the embodiment are substantially the same as those of the embodiment 1, and the main differences are as follows: the feed comprises the following raw materials in parts by weight: 130 parts by weight of polyethylene, 70 parts by weight of lignocellulose nanocrystals, 70 parts by weight of chitin nanofibers, 30 parts by weight of casein, 22 parts by weight of diatomaceous earth, 10 parts by weight of glycerol, 7 parts by weight of a lubricant, 2 parts by weight of a crosslinking agent, and 1 part by weight of a toughening agent.
Comparative example 1
The food packaging bag and the preparation method thereof provided by the embodiment are substantially the same as those of the embodiment 1, and the main differences are as follows: no lignocellulosic nanocrystals were added.
Comparative example 2
The food packaging bag and the preparation method thereof provided by the embodiment are substantially the same as those of the embodiment 1, and the main differences are as follows: no chitin nanofibers were added.
Comparative example 3
The food packaging bag and the preparation method thereof provided by the embodiment are substantially the same as those of the embodiment 1, and the main differences are as follows: no crosslinker was added.
Performance testing
Taking the food packaging bags prepared in the examples 1-3 and the comparative examples 1-3, and detecting the related performance of the prepared food packaging bags, wherein the detection method comprises the following steps: detecting the tensile strength of the food packaging bag according to GB/T13022-; detecting the degradation rate of the food packaging bag according to T/CAB 0119-2021; detecting the blocking rate of the food packaging bag according to GB/T1038; the test results obtained are recorded in table 1;
table 1 food packaging bag detecting table
As can be seen from the analysis of the related data in the above table, the food packaging bag prepared by the present invention, by suspending cellulose nanocrystals extracted from wood and chitin nanofibers extracted from crab shells in water and then spraying the solution onto the polymer substrate in alternating layers, the negatively charged cellulose nanocrystals and the positively charged chitin nanofibers have good binding properties, and the resulting transparent film has high flexibility and tensile strength, which is difficult for gas molecules to penetrate the solid crystals due to the presence of nanocrystals, greatly reduced permeability, and forms a casein film on the surface of the food packaging bag, which effectively inhibits oxygen permeation, in addition to effectively preventing food spoilage, the packaging film can be directly eaten, and compared to the conventional packaging bag, the cleanliness of the food contained therein is improved, and can be quickly biodegraded after being discarded, thereby being more environment-friendly.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. The food packaging bag is characterized by comprising the following raw materials in parts by weight: 124-145 parts of polyethylene, 65-75 parts of lignocellulose nanocrystals, 65-80 parts of chitin nanofibers, 27-34 parts of casein, 20-25 parts of diatomite, 8-13 parts of glycerol, 5-8 parts of lubricant, 1-2.5 parts of cross-linking agent and 0.5-1.5 parts of toughening agent.
2. The food packaging bag according to claim 1, wherein: the lubricant is magnesium stearate or calcium stearate.
3. The food packaging bag according to claim 1, wherein: the cross-linking agent is one or more of vinyl trimethoxy silicon, di-tert-butyl hexane peroxide, 2-ethyl-4-methylimidazole and 2-phenylimidazole.
4. The food packaging bag according to claim 1, wherein: the toughening agent is a styrene-butadiene copolymer.
5. The preparation method of the food packaging bag is characterized by comprising the following steps:
s1, obtaining lignocellulose nanocrystals from wood, bamboo or straws;
s2, extracting chitin nano-fibers from the carapace of crustaceans, wherein the crustaceans comprise crabs and shrimps;
s3, preparing a polymer substrate;
s4, mixing and suspending the lignocellulose nanocrystals and the chitin nanofibers in water, and spraying the solution on the surface of the polymer substrate in the alternating layers;
s5, extracting casein from milk, spraying the casein onto the surface of the polymer base material in an atomizing manner, and drying for 15-30min at the temperature of 60-75 ℃.
6. The method for preparing food packaging bag according to claim 5, wherein the step S1 of obtaining lignocellulose nanocrystals comprises the following steps:
s10, smashing the wood raw material until the particle size is less than or equal to 80 meshes to obtain wood chips;
s11, adding the sawdust into a sulfuric acid solution of 0.075-0.2 mol/L to obtain a slurry, carrying out hydrothermal treatment on the slurry at 150-180 ℃ for 40-80min, and carrying out solid-liquid separation to obtain a treatment solution;
s12, carrying out centrifugal separation on the treatment liquid, wherein the obtained lower-layer precipitate is cellulose crystals.
7. The method for preparing a food packaging bag according to claim 5, wherein the extracting chitin nanofibers in step S2 comprises the steps of:
s20, smashing the crustacean shell to be below 120 meshes to obtain chitin powder;
s21, heating the chitin powder in water bath or oil bath at 60-80 ℃ by using 2-3mol/L low-concentration inorganic acid solution, adding the chitin powder, and stirring at low speed until full acidolysis is performed to obtain acidolysis suspension;
s22, centrifuging the acidolysis suspension at a high speed, taking the precipitate, washing the precipitate with water, and dispersing the precipitate in water again to obtain a dispersion liquid;
s23, carrying out ultrasonic crushing on the dispersion liquid to obtain the chitin nanofiber aqueous suspension.
8. The method for preparing a food packaging bag according to claim 5, wherein the preparing the polymer base material in step S3 comprises the steps of:
s30, putting the polyethylene, the diatomite, the glycerol, the lubricant, the cross-linking agent and the toughening agent into a high-speed mixer, and mixing for 25-35 min;
s31, performing physical and chemical reactions on the mixed materials through a single-screw extruder with the temperature controlled at 180-220 ℃ and the screw rotating speed controlled at 30-50r/min, and performing longitudinal stretching, transverse stretching and traction;
and S32, discharging and cutting to obtain the polymer base material.
9. The method for preparing a food packaging bag according to claim 5, wherein the extracting casein from the milk in step S5 includes the steps of:
s50, taking the waste milk, placing the waste milk at 4 ℃, centrifugally degreasing for 15-30min, and slowly adjusting the pH of the degreased milk to 4.5-4.7 by adopting 0.1mol/L glacial acetic acid;
s51, standing for 0.5-1h, filtering and precipitating, and freeze-drying to obtain crude casein freeze-dried powder;
s52, preparing a 2% protein solution from the crude casein freeze-dried powder, slowly adjusting the pH of the protein solution to 7.0-7.5 by using 0.5mol/L ammonia water solution, adding a divalent soluble calcium salt according to the proportion of 0.03-0.09mol/L, and centrifuging to retain a supernatant and a precipitate;
s53, dissolving the precipitate in 0.03-0.09mol/L disodium ethylene diamine tetraacetate solution, dialyzing, and freeze-drying to obtain the casein.
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