CN114573962A - Degradable food packaging material - Google Patents
Degradable food packaging material Download PDFInfo
- Publication number
- CN114573962A CN114573962A CN202210348987.0A CN202210348987A CN114573962A CN 114573962 A CN114573962 A CN 114573962A CN 202210348987 A CN202210348987 A CN 202210348987A CN 114573962 A CN114573962 A CN 114573962A
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- Prior art keywords
- stirring
- parts
- packaging material
- food packaging
- chitosan
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- 239000005003 food packaging material Substances 0.000 title claims abstract description 29
- 238000003756 stirring Methods 0.000 claims abstract description 59
- 229920001661 Chitosan Polymers 0.000 claims abstract description 51
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 42
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical group CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 150000004714 phosphonium salts Chemical group 0.000 claims abstract description 23
- 239000003242 anti bacterial agent Substances 0.000 claims abstract description 22
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims abstract description 21
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 21
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 20
- 239000004626 polylactic acid Substances 0.000 claims abstract description 20
- 239000004014 plasticizer Substances 0.000 claims abstract description 16
- FRPZMMHWLSIFAZ-UHFFFAOYSA-N 10-undecenoic acid Chemical compound OC(=O)CCCCCCCCC=C FRPZMMHWLSIFAZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- KTPLMACSFXCPHL-UHFFFAOYSA-N 9-ethenylphenanthrene Chemical group C1=CC=C2C(C=C)=CC3=CC=CC=C3C2=C1 KTPLMACSFXCPHL-UHFFFAOYSA-N 0.000 claims abstract description 14
- KHAVLLBUVKBTBG-UHFFFAOYSA-N caproleic acid Natural products OC(=O)CCCCCCCC=C KHAVLLBUVKBTBG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 14
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229960002703 undecylenic acid Drugs 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- YZYKBQUWMPUVEN-UHFFFAOYSA-N zafuleptine Chemical compound OC(=O)CCCCCC(C(C)C)NCC1=CC=C(F)C=C1 YZYKBQUWMPUVEN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 10
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000004132 cross linking Methods 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 4
- KPGXRSRHYNQIFN-UHFFFAOYSA-N 2-oxoglutaric acid Chemical compound OC(=O)CCC(=O)C(O)=O KPGXRSRHYNQIFN-UHFFFAOYSA-N 0.000 claims description 16
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 16
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 10
- 238000003760 magnetic stirring Methods 0.000 claims description 9
- DMAYBPBPEUFIHJ-UHFFFAOYSA-N 4-bromobut-1-ene Chemical compound BrCCC=C DMAYBPBPEUFIHJ-UHFFFAOYSA-N 0.000 claims description 8
- HWXBTNAVRSUOJR-UHFFFAOYSA-N alpha-hydroxyglutaric acid Natural products OC(=O)C(O)CCC(O)=O HWXBTNAVRSUOJR-UHFFFAOYSA-N 0.000 claims description 8
- 229940009533 alpha-ketoglutaric acid Drugs 0.000 claims description 8
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 7
- 239000012279 sodium borohydride Substances 0.000 claims description 7
- 238000004821 distillation Methods 0.000 claims description 5
- 239000003999 initiator Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000002861 polymer material Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 16
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 230000000844 anti-bacterial effect Effects 0.000 description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- 239000012065 filter cake Substances 0.000 description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 239000005022 packaging material Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000004599 antimicrobial Substances 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 239000007810 chemical reaction solvent Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000000967 suction filtration Methods 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- DOOTYTYQINUNNV-UHFFFAOYSA-N Triethyl citrate Chemical compound CCOC(=O)CC(O)(C(=O)OCC)CC(=O)OCC DOOTYTYQINUNNV-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 235000012424 soybean oil Nutrition 0.000 description 3
- 239000003549 soybean oil Substances 0.000 description 3
- 239000001069 triethyl citrate Substances 0.000 description 3
- VMYFZRTXGLUXMZ-UHFFFAOYSA-N triethyl citrate Natural products CCOC(=O)C(O)(C(=O)OCC)C(=O)OCC VMYFZRTXGLUXMZ-UHFFFAOYSA-N 0.000 description 3
- 235000013769 triethyl citrate Nutrition 0.000 description 3
- JXSRRBVHLUJJFC-UHFFFAOYSA-N 7-amino-2-methylsulfanyl-[1,2,4]triazolo[1,5-a]pyrimidine-6-carbonitrile Chemical compound N1=CC(C#N)=C(N)N2N=C(SC)N=C21 JXSRRBVHLUJJFC-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 150000008064 anhydrides Chemical group 0.000 description 2
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 description 2
- GWOWVOYJLHSRJJ-UHFFFAOYSA-L cadmium stearate Chemical compound [Cd+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O GWOWVOYJLHSRJJ-UHFFFAOYSA-L 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920006238 degradable plastic Polymers 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 235000019359 magnesium stearate Nutrition 0.000 description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- OXIKLRTYAYRAOE-CMDGGOBGSA-N (e)-3-(1-benzyl-3-pyridin-3-ylpyrazol-4-yl)prop-2-enoic acid Chemical group N1=C(C=2C=NC=CC=2)C(/C=C/C(=O)O)=CN1CC1=CC=CC=C1 OXIKLRTYAYRAOE-CMDGGOBGSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 244000005700 microbiome Species 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
- 239000002667 nucleating agent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/04—Anhydrides, e.g. cyclic anhydrides
- C08F222/06—Maleic anhydride
-
- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- 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
- C08J2429/00—Characterised by the use 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 alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- 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
- C08J2435/00—Characterised by the use 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 a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Derivatives of such polymers
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- 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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Biochemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a degradable food packaging material, which belongs to the technical field of preparation of high polymer materials and comprises the following raw materials in parts by weight: 65-70 parts of polylactic acid, 20-30 parts of polyvinyl alcohol, 7 parts of montmorillonite, 0.25-0.5 part of dispersant, 2-3 parts of plasticizer, 3-6 parts of crosslinking antibacterial agent and 2-4 parts of modified chitosan; mixing undecylenic acid, maleic anhydride, alkenyl quaternary phosphonium salt, 9-vinyl phenanthrene and DMSO, stirring at 30 ℃, adding an initiator azobisisobutyronitrile, stirring at 75 ℃ for reaction for 6-8 hours under the protection of nitrogen to obtain a cross-linked antibacterial agent, placing carboxylated chitosan into an acetic acid solution, stirring, adding zinc acetate dihydrate, stirring at 60 ℃, adjusting the pH value to 10, and stirring for reaction for 4 hours to obtain modified chitosan.
Description
Technical Field
The invention belongs to the technical field of preparation of high polymer materials, and particularly relates to a degradable food packaging material.
Background
With the increasing use of plastics, the wastes of various plastic products are easy to form white garbage and cause serious environmental pollution, the current packaging plastics mainly comprise polystyrene, polypropylene, polyethylene and the like, after the plastics are used, the plastics cannot be degraded and exist in natural environment for a long time to cause serious white pollution, in order to solve the problem, the research and development of degradable plastics are important, polylactic acid can be completely degraded by microorganisms in the nature after being used, and finally carbon dioxide and water are generated, so that the environment is not polluted, the degradable plastic has good biodegradable performance and environment-friendly characteristic, and is a novel green environment-friendly material.
Chinese patent CN109438937B discloses an antibacterial PLA-based degradable food packaging material and a preparation method thereof, which specifically comprises the following steps: (1) carrying out ultrafine grinding on the activated carbon, and then carrying out hydrochloric acid and ultrasonic washing to obtain treated activated carbon; (2) putting the activated carbon obtained in the step (1) into deionized water, adding a certain amount of nano titanium dioxide and hexadecyl trimethyl ammonium bromide, stirring, washing and drying; (3) adding granules prepared from the mixture of the active carbon loaded with the nano titanium dioxide, the polylactic acid, the polyhydroxyalkanoate and the plasticizer into a tabletting machine to press the granules into a film, thus obtaining the antibacterial PLA-based degradable food packaging material. This patent incorporates the loading of TiO into the packaging material2The active carbon and the hexadecyl trimethyl ammonium bromide endow the packaging material with excellent antibacterial performance and toxic gas adsorption performance, but load TiO2The active carbon has poor compatibility with polylactic acid matrix, is easy to agglomerate and difficult to disperse, and has influence onThe mechanical property of the packaging material, cetyl trimethyl ammonium bromide belongs to a small molecular antibacterial agent, and is easy to migrate and draw out, so that the antibacterial property of the packaging material is poor.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a degradable food packaging material.
The purpose of the invention can be realized by the following technical scheme:
a degradable food packaging material comprises the following raw materials in parts by weight: 65-70 parts of polylactic acid, 20-30 parts of polyvinyl alcohol, 7 parts of montmorillonite, 0.25-0.5 part of dispersant, 2-3 parts of plasticizer, 3-6 parts of crosslinking antibacterial agent and 2-4 parts of modified chitosan;
the degradable food packaging material is prepared by the following steps:
firstly, adding polylactic acid, polyvinyl alcohol, montmorillonite, a dispersing agent, a plasticizer, a cross-linked antibacterial agent and modified chitosan into a proportioning container according to a formula ratio, and uniformly stirring at the temperature of 110-125 ℃ to obtain a first material;
secondly, adding the first material into a double-screw extruder, and carrying out melting, strip extrusion, cooling and grain cutting to obtain a second material, wherein the temperature in the double-screw extruder is 120-190 ℃;
and thirdly, adding the second material into a tabletting machine to be pressed into a film, so as to obtain the degradable food packaging material.
Further, the crosslinked antimicrobial agent is prepared by the steps of:
step A1, adding triphenylphosphine into carbon tetrachloride, dissolving for 15-20min by magnetic stirring, then dropwise adding 4-bromo-1-butene, controlling the dropwise adding speed to be 1 drop/2 sec, carrying out magnetic stirring in the dropwise adding process, after the dropwise adding is finished, stirring and reacting for 4-6h at 45 ℃, after the reaction is finished, carrying out suction filtration, recrystallizing a filter cake by acetone, and drying a recrystallized product in a vacuum oven at 80 ℃ to obtain the alkenyl quaternary phosphonium salt;
wherein the dosage ratio of triphenylphosphine, carbon tetrachloride and 4-bromo-1-butene is 0.1 mol: 250-300 mL: 0.1mol, taking triphenylphosphine and 4-bromo-1-butene as raw materials, and carbon tetrachloride as a solvent to synthesize alkenyl quaternary phosphonium salt;
step A2, adding undecylenic acid, maleic anhydride, alkenyl quaternary phosphonium salt and 9-vinyl phenanthrene into a three-neck flask with a stirring paddle and a thermometer, adding DMSO as a reaction solvent, heating to 30 ℃, stirring for 20min, adding an initiator azobisisobutyronitrile, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 6-8h, and after the reaction is finished, carrying out reduced pressure distillation to remove DMSO, thus obtaining a cross-linked antibacterial agent;
wherein the dosage ratio of the undecylenic acid, the maleic anhydride, the alkenyl quaternary phosphonium salt, the 9-vinyl phenanthrene and the DMSO is 0.04 mol: 0.06 mol: 0.02 mol: 0.01 mol: 200mL, the dosage ratio of the azodiisobutyronitrile is 0.7-0.8% of the mass sum of the undecylenic acid, the maleic anhydride, the alkenyl quaternary phosphonium salt and the 9-vinyl phenanthrene, and the undecylenic acid, the maleic anhydride, the alkenyl quaternary phosphonium salt and the 9-vinyl phenanthrene are subjected to polymerization reaction under the action of the azodiisobutyronitrile to obtain the cross-linked antibacterial agent.
Further, the modified chitosan is prepared by the following steps:
step B1, placing chitosan in acetic acid solution with the mass fraction of 1%, stirring for 5-8min, adding alpha-ketoglutaric acid, stirring for reaction for 24h at 37-40 ℃, then adding sodium borohydride, keeping the temperature for reaction for 10h, after the reaction is finished, stopping the reaction by using ethanol with the mass fraction of 95%, filtering, washing a filter cake for three times by using ethanol and diethyl ether respectively, and drying at 50 ℃ to constant weight to obtain carboxylated chitosan;
wherein the dosage ratio of the chitosan, the acetic acid solution, the alpha-ketoglutaric acid and the sodium borohydride is 2-3 g: 60-80 mL: 3.2-3.5 g: 0.5-0.8g, reacting chitosan and alpha-ketoglutaric acid to obtain carboxylated chitosan;
step B2, placing the carboxylated chitosan into an acetic acid solution with the mass fraction of 1%, stirring for 5-8min, adding zinc acetate dihydrate, magnetically stirring at normal temperature until the zinc acetate dihydrate is completely dissolved, heating to 60 ℃, adding a sodium hydroxide solution with the concentration of 1mol/L while stirring to adjust the pH value to 10, continuing stirring for reaction for 4h, centrifuging at the rotation speed of 1000r/min after the reaction is finished, and placing the precipitate at 50 ℃ for vacuum drying for 24h to obtain the modified chitosan;
wherein the dosage ratio of the carboxylated chitosan to the acetic acid solution to the zinc acetate dihydrate is 16.5-20.2 g: 250-350 mL: 0.05mol, and preparing the modified chitosan by taking chitosan and zinc acetate dihydrate as raw materials through a chemical precipitation method by utilizing the chelation between amino and hydroxyl in the molecular structure of the carboxylated chitosan and zinc atoms.
Further, the dispersing agent is formed by mixing one or more of barium stearate, zinc stearate, calcium stearate, cadmium stearate, magnesium stearate and copper stearate according to any proportion.
Furthermore, the plasticizer is one or more of epoxidized soybean oil, triethyl citrate, glycerol and polyethylene glycol which are mixed according to any proportion, and the plasticizer is added to weaken the secondary bond among polymer molecules, increase the mobility of polymer molecular chains, increase the plasticity of the polymer, reduce the brittleness of the polymer and improve the elongation, the flexibility and the flexibility of the polymer.
The invention has the beneficial effects that:
the invention adds the cross-linking antibacterial agent and the modified chitosan into the food packaging material, on one hand, the antibacterial property of the polylactic acid is improved, on the other hand, the heat resistance of the polylactic acid is improved, wherein the cross-linking antibacterial agent not only contains a quaternary phosphonium salt antibacterial group, but also contains an anhydride group, a terminal carboxyl long chain and a condensed ring structure, the anhydride group and the carboxyl group can form a chemical bond with the terminal hydroxyl of the polylactic acid at high temperature, the condensed ring structure is introduced into the composite material, when the composite material is subjected to high temperature, the energy absorbed by the system is dispersed on the condensed ring group with a large conjugated structure instead of being concentrated on the fracture of a certain chemical bond, the cross-linking and cracking reaction caused by the high temperature are inhibited to a certain extent, the heat resistance protection effect is achieved, the heat resistance of the packaging material is improved, and the modified chitosan contains hydroxyl, carboxyl and nano zinc oxide particles, the hydroxyl and carboxyl enable the modified chitosan and the polylactic acid to have good compatibility, and the nano zinc oxide particles and the quaternary phosphonium salt antibacterial groups perform an antibacterial effect synergistically on one hand, and serve as nucleating agents to improve the crystallization performance of the polylactic acid on the other hand.
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 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.
Example 1
This example provides a crosslinked antimicrobial agent made by the steps of:
step A1, adding 0.1mol of triphenylphosphine into 250mL of carbon tetrachloride, dissolving for 15min by magnetic stirring, then dropwise adding 0.1mol of 4-bromo-1-butene, controlling the dropwise adding speed to be 1 drop/2 sec, carrying out magnetic stirring in the dropwise adding process, stirring and reacting for 4h at 45 ℃ after dropwise adding is finished, carrying out suction filtration after the reaction is finished, recrystallizing a filter cake by acetone, and drying a recrystallized product in a vacuum oven at 80 ℃ to obtain the alkenyl quaternary phosphonium salt;
step A2, adding 0.04mol of undecylenic acid, 0.06mol of maleic anhydride, 0.02mol of alkenyl quaternary phosphonium salt and 0.01mol of 9-vinyl phenanthrene into a three-neck flask with a stirring paddle and a thermometer, adding 200mL of DMSO as a reaction solvent, heating to 30 ℃, stirring for 20min, adding an initiator of azobisisobutyronitrile, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 6h, and after the reaction is finished, removing the DMSO by reduced pressure distillation to obtain a cross-linked antibacterial agent, wherein the dosage ratio of the azobisisobutyronitrile is 0.7% of the mass sum of the undecylenic acid, the maleic anhydride, the alkenyl quaternary phosphonium salt and the 9-vinyl phenanthrene.
Example 2
This example provides a crosslinked antimicrobial agent made by the steps of:
step A1, adding 0.1mol of triphenylphosphine into 280mL of carbon tetrachloride, dissolving for 18min by magnetic stirring, then dropwise adding 0.1mol of 4-bromo-1-butene, controlling the dropwise adding speed to be 1 drop/2 sec, carrying out magnetic stirring in the dropwise adding process, after the dropwise adding is finished, stirring and reacting for 5h at 45 ℃, after the reaction is finished, carrying out suction filtration, recrystallizing a filter cake by acetone, and drying a recrystallized product in a vacuum oven at 80 ℃ to obtain the alkenyl quaternary phosphonium salt;
step A2, adding 0.04mol of undecylenic acid, 0.06mol of maleic anhydride, 0.02mol of alkenyl quaternary phosphonium salt and 0.01mol of 9-vinyl phenanthrene into a three-neck flask with a stirring paddle and a thermometer, adding 250mL of DMSO as a reaction solvent, heating to 30 ℃, stirring for 20min, adding an initiator of azobisisobutyronitrile, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 7h, and after the reaction is finished, removing the DMSO by reduced pressure distillation to obtain a cross-linked antibacterial agent, wherein the dosage ratio of the azobisisobutyronitrile is 0.75% of the mass sum of the undecylenic acid, the maleic anhydride, the alkenyl quaternary phosphonium salt and the 9-vinyl phenanthrene.
Example 3
This example provides a crosslinked antimicrobial agent made by the steps of:
step A1, adding 0.1mol of triphenylphosphine into 300mL of carbon tetrachloride, dissolving for 20min by magnetic stirring, then dropwise adding 0.1mol of 4-bromo-1-butene, controlling the dropwise adding speed to be 1 drop/2 sec, carrying out magnetic stirring in the dropwise adding process, after the dropwise adding is finished, stirring and reacting for 6h at 45 ℃, after the reaction is finished, carrying out suction filtration, recrystallizing a filter cake by acetone, and drying a recrystallized product in a vacuum oven at 80 ℃ to obtain the alkenyl quaternary phosphonium salt;
step A2, adding 0.04mol of undecylenic acid, 0.06mol of maleic anhydride, 0.02mol of alkenyl quaternary phosphonium salt and 0.01mol of 9-vinyl phenanthrene into a three-neck flask with a stirring paddle and a thermometer, adding 300mL of DMSO as a reaction solvent, heating to 30 ℃, stirring for 20min, adding an initiator azobisisobutyronitrile, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 8h, and after the reaction is finished, removing the DMSO by reduced pressure distillation to obtain a cross-linking antibacterial agent, wherein the dosage ratio of the azobisisobutyronitrile is 0.8% of the sum of the mass of the undecylenic acid, the mass of the maleic anhydride, the mass of the alkenyl quaternary phosphonium salt and the mass of the 9-vinyl phenanthrene.
Example 4
The embodiment provides modified chitosan, which is prepared by the following steps:
step B1, placing 2g of chitosan into 60mL of acetic acid solution with the mass fraction of 1%, stirring for 5min, adding 3.2g of alpha-ketoglutaric acid, stirring and reacting at 37 ℃ for 24h, then adding 0.5g of sodium borohydride, keeping the temperature and reacting for 10h, after the reaction is finished, stopping the reaction by using ethanol with the mass fraction of 95%, filtering, washing a filter cake by using ethanol and diethyl ether for three times respectively, and drying at 50 ℃ to constant weight to obtain carboxylated chitosan;
and step B2, placing 16.5g of carboxylated chitosan into 250mL of acetic acid solution with the mass fraction of 1%, stirring for 5min, adding 0.05mol of zinc acetate dihydrate, magnetically stirring at normal temperature until the zinc acetate dihydrate is completely dissolved, heating to 60 ℃, adding 1mol/L sodium hydroxide solution with the concentration of 1mol/L while stirring to adjust the pH value to 10, continuing stirring for reaction for 4h, centrifuging at the rotating speed of 1000r/min after the reaction is finished, and placing the precipitate at 50 ℃ for vacuum drying for 24h to obtain the modified chitosan.
Example 5
The embodiment provides modified chitosan, which is prepared by the following steps:
step B1, placing 2.5g of chitosan into 70mL of acetic acid solution with the mass fraction of 1%, stirring for 7min, adding 3.4g of alpha-ketoglutaric acid, stirring at 38 ℃ for reaction for 24h, then adding 0.7g of sodium borohydride, keeping the temperature for reaction for 10h, after the reaction is finished, stopping the reaction by using ethanol with the mass fraction of 95%, filtering, washing a filter cake by using ethanol and diethyl ether for three times respectively, and drying at 50 ℃ to constant weight to obtain carboxylated chitosan;
and step B2, placing 18.2g of carboxylated chitosan into 300mL of acetic acid solution with the mass fraction of 1%, stirring for 7min, adding 0.05mol of zinc acetate dihydrate, magnetically stirring at normal temperature until the zinc acetate dihydrate is completely dissolved, heating to 60 ℃, adding 1mol/L sodium hydroxide solution with the concentration of 1mol/L while stirring to adjust the pH value to 10, continuing stirring for reaction for 4h, centrifuging at the rotating speed of 1000r/min after the reaction is finished, and placing the precipitate at 50 ℃ for vacuum drying for 24h to obtain the modified chitosan.
Example 6
The embodiment provides a modified chitosan, which is prepared by the following steps:
step B1, placing 3g of chitosan into 80mL of acetic acid solution with the mass fraction of 1%, stirring for 8min, adding 3.5g of alpha-ketoglutaric acid, stirring and reacting for 24h at 40 ℃, then adding 0.8g of sodium borohydride, keeping the temperature and reacting for 10h, after the reaction is finished, stopping the reaction by using ethanol with the mass fraction of 95%, filtering, washing a filter cake for three times by using ethanol and diethyl ether respectively, and drying at 50 ℃ to constant weight to obtain carboxylated chitosan;
and step B2, placing 20.2g of carboxylated chitosan into 350mL of acetic acid solution with the mass fraction of 1%, stirring for 8min, adding 0.05mol of zinc acetate dihydrate, magnetically stirring at normal temperature until the zinc acetate dihydrate is completely dissolved, heating to 60 ℃, adding 1mol/L sodium hydroxide solution with the concentration of 1mol/L while stirring to adjust the pH value to 10, continuing stirring for reaction for 4h, centrifuging at the rotating speed of 1000r/min after the reaction is finished, and placing the precipitate at 50 ℃ for vacuum drying for 24h to obtain the modified chitosan.
Example 7
A degradable food packaging material comprises the following raw materials in parts by weight: 65 parts of polylactic acid, 20 parts of polyvinyl alcohol, 7 parts of montmorillonite, 0.25 part of dispersant, 2 parts of plasticizer, 3 parts of cross-linked antibacterial agent in example 1 and 2 parts of modified chitosan in example 3;
the degradable food packaging material is prepared by the following steps:
firstly, adding polylactic acid, polyvinyl alcohol, montmorillonite, a dispersing agent, a plasticizer, a cross-linked antibacterial agent and modified chitosan into a batching container according to a formula ratio, and uniformly stirring at 110 ℃ to obtain a first material;
secondly, adding the first material into a double-screw extruder, and carrying out melting, strip extrusion, cooling and grain cutting to obtain a second material, wherein the temperature in the double-screw extruder is 120-190 ℃;
and thirdly, adding the second material into a tablet press to be pressed into a film, so as to obtain the degradable food packaging material.
Wherein the dispersant is barium stearate, and the plasticizer is epoxidized soybean oil.
Example 8
A degradable food packaging material comprises the following raw materials in parts by weight: 68 parts of polylactic acid, 25 parts of polyvinyl alcohol, 7 parts of montmorillonite, 0.4 part of dispersant, 2.5 parts of plasticizer, 4 parts of cross-linked antibacterial agent in example 2 and 3 parts of modified chitosan in example 4;
the degradable food packaging material is prepared by the following steps:
firstly, adding polylactic acid, polyvinyl alcohol, montmorillonite, a dispersing agent, a plasticizer, a cross-linked antibacterial agent and modified chitosan into a batching container according to a formula ratio, and uniformly stirring at 120 ℃ to obtain a first material;
secondly, adding the first material into a double-screw extruder, and carrying out melting, extrusion and bracing, cooling and grain cutting to obtain a second material, wherein the temperature in the double-screw extruder is 120-190 ℃;
and thirdly, adding the second material into a tablet press to be pressed into a film, so as to obtain the degradable food packaging material.
Wherein the dispersant is zinc stearate, and the plasticizer is triethyl citrate.
Example 9
A degradable food packaging material comprises the following raw materials in parts by weight: 70 parts of polylactic acid, 30 parts of polyvinyl alcohol, 7 parts of montmorillonite, 0.5 part of dispersant, 3 parts of plasticizer, 6 parts of cross-linked antibacterial agent in example 1 and 4 parts of modified chitosan in example 4;
the degradable food packaging material is prepared by the following steps:
firstly, adding polylactic acid, polyvinyl alcohol, montmorillonite, a dispersing agent, a plasticizer, a cross-linked antibacterial agent and modified chitosan into a batching container according to a formula ratio, and uniformly stirring at 125 ℃ to obtain a first material;
secondly, adding the first material into a double-screw extruder, and carrying out melting, strip extrusion, cooling and grain cutting to obtain a second material, wherein the temperature in the double-screw extruder is 120-190 ℃;
and thirdly, adding the second material into a tabletting machine to be pressed into a film, so as to obtain the degradable food packaging material.
Wherein the dispersing agent is cadmium stearate, magnesium stearate and copper stearate according to the mass ratio of 1: 1: 1, and the plasticizer is epoxidized soybean oil, triethyl citrate and glycerol according to a mass ratio of 1: 1: 1, mixing the components.
Comparative example 1
The modified chitosan in example 7 was replaced with chitosan, and the remaining raw materials and preparation process were the same as in example 7.
Comparative example 2
The crosslinked antibacterial agent of example 8 was replaced with cetyltrimethylammonium bromide, and the remaining raw materials and preparation were the same as in example 8.
The packaging materials prepared in examples 7-9 and comparative examples 1-2 were tested, the mechanical properties were tested according to GB13022-91 standard, the antibacterial properties were tested according to GB/T31402-:
TABLE 1
As can be seen from Table 1, the food packaging materials prepared in examples 7 to 9 are superior in tensile strength to comparative examples 1 to 2, and superior in antibacterial property and antibacterial durability to comparative examples 1 to 2.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (8)
1. The degradable food packaging material is characterized by comprising the following raw materials in parts by weight: 65-70 parts of polylactic acid, 20-30 parts of polyvinyl alcohol, 7 parts of montmorillonite, 0.25-0.5 part of dispersant, 2-3 parts of plasticizer, 3-6 parts of crosslinking antibacterial agent and 2-4 parts of modified chitosan;
wherein, the crosslinking antibacterial agent is prepared by the following steps:
mixing undecylenic acid, maleic anhydride, alkenyl quaternary phosphonium salt, 9-vinyl phenanthrene and DMSO, heating to 30 ℃, stirring, adding azobisisobutyronitrile, heating to 75 ℃ under the protection of nitrogen, stirring for reacting for 6-8 hours, and after the reaction is finished, carrying out reduced pressure distillation to obtain the crosslinking antibacterial agent.
2. The degradable food packaging material of claim 1, wherein the ratio of the dosage of undecylenic acid, maleic anhydride, alkenyl quaternary phosphonium salt, 9-vinyl phenanthrene and DMSO is 0.04 mol: 0.06 mol: 0.02 mol: 0.01 mol: 200 and 300 mL.
3. The degradable food packaging material of claim 1, wherein the azodiisobutyronitrile is used in an amount of 0.7 to 0.8% by mass of the sum of undecylenic acid, maleic anhydride, the alkenyl quaternary phosphonium salt and 9-vinylphenanthrene.
4. The degradable food packaging material of claim 1, wherein the alkenyl quaternary phosphonium salt is prepared by the steps of:
adding triphenylphosphine into carbon tetrachloride, dissolving by magnetic stirring, dropwise adding 4-bromo-1-butene, reacting at 45 ℃ for 4-6h by stirring after dropwise adding, and performing post-treatment to obtain the alkenyl quaternary phosphonium salt.
5. The degradable food packaging material of claim 4, wherein triphenylphosphine, carbon tetrachloride and 4-bromo-1-butene are used in a ratio of 0.1 mol: 250-300 mL: 0.1 mol.
6. The degradable food packaging material of claim 1, wherein the modified chitosan is prepared by the following steps:
placing the carboxylated chitosan into an acetic acid solution with the mass fraction of 1%, stirring, adding zinc acetate dihydrate, magnetically stirring and dissolving at normal temperature, heating to 60 ℃, adjusting the pH value to 10 by using a sodium hydroxide solution under stirring, continuously stirring and reacting for 4 hours, centrifuging, and drying to obtain the modified chitosan.
7. The degradable food packaging material of claim 6, wherein the carboxylated chitosan is prepared by the following steps:
placing chitosan into an acetic acid solution with the mass fraction of 1%, adding alpha-ketoglutaric acid after stirring, stirring and reacting for 24 hours at 37-40 ℃, then adding sodium borohydride, keeping the temperature and reacting for 10 hours, and performing post-treatment to obtain the carboxylated chitosan.
8. The degradable food packaging material of claim 7, wherein the amount ratio of chitosan, acetic acid solution, α -ketoglutaric acid and sodium borohydride is 2-3 g: 60-80 mL: 3.2-3.5 g: 0.5-0.8 g.
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