CN114541169A - Recyclable composite packaging bag - Google Patents
Recyclable composite packaging bag Download PDFInfo
- Publication number
- CN114541169A CN114541169A CN202210150148.8A CN202210150148A CN114541169A CN 114541169 A CN114541169 A CN 114541169A CN 202210150148 A CN202210150148 A CN 202210150148A CN 114541169 A CN114541169 A CN 114541169A
- Authority
- CN
- China
- Prior art keywords
- packaging bag
- carnauba wax
- paper
- solution
- composite packaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 74
- 239000002131 composite material Substances 0.000 title claims abstract description 64
- 239000011248 coating agent Substances 0.000 claims abstract description 64
- 238000000576 coating method Methods 0.000 claims abstract description 63
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 54
- 229920005610 lignin Polymers 0.000 claims abstract description 37
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims abstract description 27
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims abstract description 16
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 66
- 239000004203 carnauba wax Substances 0.000 claims description 52
- 235000013869 carnauba wax Nutrition 0.000 claims description 52
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 23
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 22
- 238000002360 preparation method Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 18
- 239000002202 Polyethylene glycol Substances 0.000 claims description 15
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 15
- 229920001223 polyethylene glycol Polymers 0.000 claims description 15
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 11
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 11
- 238000002791 soaking Methods 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 235000013305 food Nutrition 0.000 abstract description 26
- 230000008901 benefit Effects 0.000 abstract description 7
- 244000052616 bacterial pathogen Species 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 71
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 19
- 239000005022 packaging material Substances 0.000 description 16
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 229920003023 plastic Polymers 0.000 description 11
- 239000004033 plastic Substances 0.000 description 11
- 108010082754 iturin A Proteins 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000000844 anti-bacterial effect Effects 0.000 description 8
- 238000004132 cross linking Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000005003 food packaging material Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910001961 silver nitrate Inorganic materials 0.000 description 6
- 108010028921 Lipopeptides Proteins 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 241000193830 Bacillus <bacterium> Species 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 230000003115 biocidal effect Effects 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 241000588724 Escherichia coli Species 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 241000293869 Salmonella enterica subsp. enterica serovar Typhimurium Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003242 anti bacterial agent Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 229920001222 biopolymer Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 210000003298 dental enamel Anatomy 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 125000005313 fatty acid group Chemical group 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 150000002500 ions Chemical group 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 150000002513 isocyanates Chemical class 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000011527 polyurethane coating Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920001410 Microfiber Polymers 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000001888 Peptone Substances 0.000 description 1
- 108010080698 Peptones Proteins 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000003385 bacteriostatic effect Effects 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 229920000704 biodegradable plastic Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 244000053095 fungal pathogen Species 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000019319 peptone Nutrition 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011846 petroleum-based material Substances 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 235000021404 traditional food Nutrition 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 235000013618 yogurt Nutrition 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/02—Material of vegetable origin
-
- 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
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4081—Mixtures of compounds of group C08G18/64 with other macromolecular compounds
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6492—Lignin containing materials; Wood resins; Wood tars; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/23—Lignins
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
-
- 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
- C08G2150/00—Compositions for coatings
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Wrappers (AREA)
- Packages (AREA)
- Bag Frames (AREA)
Abstract
The invention discloses a recyclable composite packaging bag, which mainly comprises the steps of preparing hydrophobic paper, preparing a surface coating, coating and forming and the like. When the surface coating is prepared, hexamethylene diisocyanate and toluene diisocyanate are selected to modify lignin, and silver nanoparticles are added on the basis. Compared with the prior art, the food packaging bag prepared by the invention has the advantages of good hydrophobic property, strong mechanical property and strong thermal stability, and can be used for limitedly inhibiting food-borne pathogenic bacteria.
Description
Technical Field
The invention relates to the field of food packaging, in particular to a recyclable composite packaging bag.
Background
Food packaging is an important component of the food industry to maintain the quality and safety of food products during storage and transportation, and to extend the shelf life of food products by preventing adverse factors or conditions (e.g., spoilage microorganisms, chemical contaminants, oxygen, moisture, light, external forces, etc.). To achieve such functionality, the packaging material provides physical protection to the product and creates suitable physicochemical conditions that are critical to ensure food shelf life and to maintain food quality and safety. Food packaging should prevent the acquisition or loss of moisture, prevent microbial contamination, and provide some protection against the transmission of water vapor, oxygen, carbon dioxide and other volatile compounds in addition to the basic properties of the packaging material (e.g., mechanical, optical and thermal properties). Food packaging not only serves as a container, but also as a protective barrier with some innovative functions.
The food packaging materials mainly comprise plastics, glass, metal, wood, paper and the like, and the packaging materials have the characteristics and achieve good packaging effects in the aspects of function, environmental protection and beauty. With the enhancement of environmental awareness and the increase of government management, food packaging gradually receives wide attention. The traditional food packaging has many defects, is not suitable for sustainable development, and the development of novel, safe and environment-friendly multifunctional food packaging materials becomes the mainstream of future development. The advantages of different packaging materials are utilized to compound the existing packaging materials to generate new packaging materials, and environment-friendly packaging materials such as green packaging materials, nano packaging materials and the like are widely recycled and reused, so that the development direction of future food packaging materials is provided.
Plastic packages have been widely used for food packaging because of their advantages of plasticity, elasticity, insulation, high strength, small specific gravity, light weight, strong corrosion resistance, easy processing, abundant resources, low energy consumption, low cost, and protection effect on food, but in the processing process, in order to improve the application performance of plastic products, people often add a variety of processing aids in petroleum-based materials, and these aids mostly secrete interferents into the human body, which may negatively affect health. In recent years, plastic food packaging materials have been developed into degradable plastics and edible plastics under the demand for environmental protection and sustainable development. For example, biodegradable plastics: starch-based plastics, polylactic acid plastics and the like are applied to the aspects of candies, edible bottled water, yoghourt, fresh agricultural and sideline products, fruits, vegetables and the like at present, and replace the traditional disposable and difficult-to-degrade plastic packaging products. However, currently, there are some limitations to biodegradable packaging materials, and those based on biopolymers have relatively poor mechanical properties, high hydrophilicity and poor processability, which limit their application in industry.
Glass packaging, which is made from a melt of silicates, metal oxides, etc., is also one of the commonly used food packaging, and the main safety problem is that migrates dissolved from the glass, such as added lead compounds and silica, may migrate into the food. The glaze material on enamel and ceramic is mainly composed of lead, zinc, antimony, barium, copper, chromium, cobalt and other metal oxides and salts thereof, and basically contains harmful substances. Enamels and ceramics have a relatively high temperature during firing, and if they are fired at a low temperature, insoluble silicates cannot be formed, and if they are used for acidic foods, these substances are easily dissolved out of the foods to cause safety problems.
Paper-based food packaging materials are mainly made of pulp and cardboard, the used raw materials, such as wood, bamboo and the like, are renewable plants, and reed, bagasse, cotton stalk, wheat straw and the like are waste materials, which are recyclable resources. Compared with other materials such as plastics, the paper packaging material has more advantages in the aspect of resources. The paper food packaging material has the advantages of low price, economy, good protection, flexible production, good air permeability, convenient storage and transportation, good flexibility, easy modeling, no pollution to contents, easy recycling and wide application in the food packaging industry.
The most abundant biopolymer in the biosphere is the carbohydrate polymer, accounting for 75% of the biomass available worldwide. Cellulose, which is by far the most abundant and widespread carbohydrate polymer and the first renewable organic substance, is more than 750 million tons per year, the most basic constituent of paper packaging materials, is widely used in packaging materials, is biodegradable and is therefore completely safe to the environment. Paper is composed of a porous fibrous structure of microfibers consisting of long-chain cellulose molecules in a crystalline state with amorphous regions that regularly disrupt the crystalline structure. Due to the OH sites in the basic unit of cellulose and the network structure of the fiber, the pores are relatively large, so that the fiber has natural hydrophilicity, and therefore, the unmodified paper packaging material has strong hygroscopicity. Paper packaging also readily absorbs moisture from the environment or food and loses its physical and mechanical strength properties. For food packaging, penetration of grease through the paper packaging can affect the appearance of the product. In addition, the large amount of moisture and oxygen exchange (increase or loss), accelerates the physical, chemical and microbiological changes of the surrounding environment, thus shortening the shelf life of the food product.
Chinese patent CN 108149512 a discloses a paper nut packaging bag and a preparation method thereof, comprising: mixing the original wood pulp, bark, hemp, straw, mica sheets, reinforcing filler and lime water according to a proportion, washing, drying in the sun, beating, fishing out paper, squeezing and baking the paper to prepare the paper nut packaging bag. The paper nut packaging bag prepared by the preparation method has high strength, and is wear-resistant and breakage-resistant; chinese patent CN 102370211 a discloses a paper-plastic composite packaging bag, which comprises a matte film layer, a composite aluminum film layer, a PE layer, a kraft paper layer and a PET film layer, wherein the matte film layer, the composite aluminum film layer, the PE layer, the kraft paper layer and the PET film layer are sequentially distributed from top to bottom. The paper-plastic composite packaging bag is high in structural strength, firm and durable, is made of environment-friendly materials, and can reduce pollution. The existing food packaging paper bag is environment-friendly in raw material, part of filler is usually added in the preparation process to achieve the effect of increasing the strength of the packaging bag, most of the packaging bags are poor in water resistance, and particularly, the application of the packaging bag in food packaging is limited due to the hydrophilicity of the packaging bag which is made of fiber as a base material paper packaging material. Therefore, it is very important to prepare an environment-friendly recyclable food packaging bag with good mechanical strength and water resistance and antibacterial property.
Disclosure of Invention
In order to solve the technical problems, the invention provides a recyclable composite packaging bag, which adopts the following technical scheme:
s1 preparation of hydrophobic paper: weighing carnauba wax, adding the carnauba wax into chloroform to prepare a 2-4 wt% carnauba wax solution, and heating to 50-60 ℃; then, putting the filter paper into a carnauba wax solution, soaking for 2-4 h, taking out, putting into an ethanol water solution with the volume fraction of 75-85%, solidifying for 2-3 h, taking out, and naturally drying to obtain hydrophobic paper;
s2 preparing a surface coating: dissolving 30-50 parts by weight of lignin in dimethyl sulfoxide, adding a curing agent and a catalyst to react to form a prepolymer, adding polyethylene glycol, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1, drying at 103-108 ℃ for 12-20 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain a composite packaging bag;
further preferably, the recyclable composite packaging bag has the following technical scheme:
s1 preparation of hydrophobic paper: weighing carnauba wax, adding the carnauba wax into chloroform to prepare a 2-4 wt% carnauba wax solution, and heating to 50-60 ℃; then, putting the filter paper into a carnauba wax solution, soaking for 2-4 h, taking out, putting into an ethanol water solution with the volume fraction of 75-85%, solidifying for 2-3 h, taking out, and naturally drying to obtain hydrophobic paper;
s2 preparing a surface coating: dissolving 30-50 parts by weight of lignin in dimethyl sulfoxide, adding a curing agent and a catalyst to react to form a prepolymer, adding polyethylene glycol and 0.15-0.3 part by weight of silver nanoparticles, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1, drying at 103-108 ℃ for 12-20 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain a composite packaging bag;
further, the mass-to-volume ratio of the coagulation proportioning filter paper to the ethanol in the step S1 is 25: (65-80) g/mL.
Further, the mass ratio of the addition amount of polyethylene glycol to lignin in step S2 is 1: (1-1.2).
The lignin is an amorphous aromatic polymer widely existing in plants, has biodegradable and nontoxic properties in natural environment, and has great functional modification potential due to abundant hydroxyl groups. In recent years, biodegradable, low cost paper-based packaging materials have attracted attention as alternatives to petroleum-based packaging in order to alleviate severe environmental pressures. Lignin-based polyurethanes as coating agents impart excellent mechanical properties, especially hydrophobicity and barrier properties to gases, to paper packaging the present inventors have found that using lignin and a polyol as starting materials for the synthesis of polyurethanes results in polyurethanes with good recyclability and other excellent properties. However, in order to further improve the reaction activity of lignin, the invention adopts isocyanate and lignin to carry out prepolymerization reaction to modify lignin, the modification process does not need complicated separation and purification, and hydroxyl in the lignin and excessive isocyanate react in the prepolymerization reaction to form an isocyanate-terminated prepolymer with much higher reaction activity than that of the original lignin. The pre-polymerization ensures that the lignin is involved as much as possible in the synthesis of the bio-coating, in the form of the living segments, rather than the filler.
Further, the curing agent in step S2 is a mixture of hexamethylene diisocyanate and toluene diisocyanate.
Preferably, the mass ratio of hexamethylene diisocyanate to toluene diisocyanate is 3: (5-6).
Further, the catalyst in step S2 is dibutyltin dilaurate, and the amount of dibutyltin dilaurate added is 0.5 to 2 parts by weight.
The silver nanoparticles are prepared by the following method: adding 1-2 mL of silver nitrate aqueous solution with the concentration of 0.1mg/mL into 2-4 mL of iturin A aqueous solution with the concentration of 1mg/mL, then radiating for 30-35 min by ultraviolet light with the wavelength of 365-370 nm, then centrifuging for 30-35 min at 8000-10000 rpm, collecting particles, and washing for 2-3 times by water to obtain the silver nanoparticles.
Hydroxyl and carbonyl groups in the lignin can also chelate metal ions, so that the lignin is a natural ligand of a metal coordination bond. The inventor finds that the modified lignin and the silver nanoparticles have electrostatic crosslinking, so that the modified lignin can be used as an effective capping agent, and the mechanical strength of a packaging bag can be effectively improved. Silver is an effective antibacterial agent, and the silver nanoparticles are introduced into the lignin-based polyurethane coating by utilizing the metal coordination advantage of lignin, so that the packaging performance is further improved.
In addition, the inventor finds through experiments that under the catalysis of dibutyltin dilaurate, the-OH in lignin and polyethylene glycol and the-NCO in toluene diisocyanate are condensed to form a urethane bond (-COONH-), but the thermal stability of the surface coating can be improved by further adding hexamethylene diisocyanate in the lignin modification process, the lignin and the hexamethylene diisocyanate both contain a large amount of aromatic structures, so that a large amount of residual carbon can be generated after pyrolysis, and the high reactivity of the hexamethylene diisocyanate and the coordination of silver nanoparticles and-OH enable the crosslinking to be more compact, so that the effect of improving the thermal stability of the packaging bag can be achieved.
The antibacterial effect of the nano-silver and the effect generated by compounding the nano-silver with other raw materials are in direct proportion to the addition amount of the nano-silver, but the content of the nano-silver in the material for food packaging is not too high, so on the basis, the silver nanoparticles are modified, and the nano-silver can be reduced while the same effect is achieved by compounding the iturin A and the silver nitrate. Iturin a is a cyclic lipopeptide with a fatty acid chain and a phenolic group, which can generate superoxide radical through the phenolic group and then help silver ions form silver nanoparticles under the mediation of ultraviolet radiation. The nano silver particles prepared by the method can effectively inhibit food-borne pathogenic bacteria and fungi when being applied to paper packaging, and show higher antibacterial activity, lower silver concentration and wider antibacterial spectrum compared with the common nano silver particles.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The operations referred to in the examples are, unless otherwise specified, all those known to the art.
Some raw material parameters in the comparative examples and examples of the invention are as follows:
carnauba wax, CAS: 8015-86-9, available from Shanghai-derived leaf Biotechnology, Inc.;
DMSO, dimethyl sulfoxide, CAS: 67-68-5, available from sigma aldrich trade, inc;
hexamethylene diisocyanate, CAS: 822-06-0, available from Jiaying chemical technology, Inc., Shandong;
toluene diisocyanate, CAS: 26471-46-5, available from Hubei Xinming Tibet Chemicals, Inc.;
dibutyltin dilaurate, CAS: 77-58-7, available from chemical Limited, Jinchuan, Jinan province.
Example 1
The preparation method of the recyclable composite packaging bag comprises the following steps:
s1 preparation of hydrophobic paper: weighing 15g of carnauba wax, adding the carnauba wax into 500mL of chloroform, uniformly mixing to obtain a carnauba wax solution, heating to 50 ℃ until the carnauba wax solution is completely dissolved, then putting 25g of filter paper into the molten carnauba wax solution, soaking at 50 ℃ for 3h, taking out, flatly paving in 75mL of ethanol water solution with volume fraction of 85%, solidifying for 2h, taking out, and naturally drying at the room temperature;
s2 preparing a surface coating: dissolving 40 parts by weight of lignin in DMSO, adding 3 parts by weight of hexamethylene diisocyanate, 5 parts by weight of toluene diisocyanate and 0.5 part by weight of dibutyltin dilaurate, curing and reacting to form a prepolymer, adding 40 parts by weight of polyethylene glycol into the prepolymer, and further crosslinking and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (3) integrally and uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1 by using a ZY-TB-B4 wire bar scraper, drying at 108 ℃ for 12 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
Example 2
The preparation method of the recyclable composite packaging bag comprises the following steps:
s1 preparation of hydrophobic paper: weighing 15g of carnauba wax, adding the carnauba wax into 500mL of chloroform, uniformly mixing to obtain a carnauba wax solution, heating to 50 ℃ until the carnauba wax solution is completely dissolved, then putting 25g of filter paper into the molten carnauba wax solution, soaking at 50 ℃ for 3h, taking out, flatly paving in 75mL of ethanol water solution with volume fraction of 85%, solidifying for 2h, taking out, and naturally drying at the room temperature;
s2 preparing a surface coating: dissolving 40 parts by weight of lignin in DMSO (dimethylsulfoxide), then adding 3 parts by weight of hexamethylene diisocyanate, 5 parts by weight of toluene diisocyanate and 0.5 part by weight of dibutyltin dilaurate for curing reaction to form a prepolymer, then adding 40 parts by weight of polyethylene glycol into the prepolymer for further crosslinking, then adding 0.15 part by weight of silver nanoparticles into the mixture, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (3) integrally and uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1 by using a ZY-TB-B4 wire bar scraper, drying at 108 ℃ for 12 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
The silver nanoparticles are prepared by the following method: adding 1mL of silver nitrate aqueous solution with the concentration of 0.1mg/mL into 2mL of iturin A aqueous solution with the concentration of 1mg/mL, then radiating for 30min by ultraviolet light with the wavelength of 365nm, centrifuging for 30min at 10000rpm, collecting particles, and washing for 3 times by water to obtain the silver nanoparticles.
The iturin A is a cyclic lipopeptide antibiotic produced by bacillus bacteria, CAS: 52229-90-0, available from Western Bao Biotechnology (Shanghai) Inc.
Example 3
The preparation method of the recyclable composite packaging bag comprises the following steps:
s1 preparation of hydrophobic paper: weighing 15g of carnauba wax, adding the carnauba wax into 500mL of chloroform, uniformly mixing to obtain a carnauba wax solution, heating to 50 ℃ until the carnauba wax solution is completely dissolved, then putting 25g of filter paper into the molten carnauba wax solution, soaking at 50 ℃ for 3h, taking out, flatly paving in 75mL of ethanol water solution with volume fraction of 85%, solidifying for 2h, taking out, and naturally drying at the room temperature;
s2 preparing a surface coating: dissolving 40 parts by weight of lignin in DMSO, adding 8 parts by weight of hexamethylene diisocyanate and 0.5 part by weight of dibutyltin dilaurate for curing reaction to form a prepolymer, adding 40 parts by weight of polyethylene glycol into the prepolymer for further crosslinking, adding 0.15 part by weight of silver nanoparticles into the mixture, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (3) integrally and uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1 by using a ZY-TB-B4 wire bar scraper, drying at 108 ℃ for 12 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
The silver nanoparticles are prepared by the following method: adding 1mL of silver nitrate aqueous solution with the concentration of 0.1mg/mL into 2mL of iturin A aqueous solution with the concentration of 1mg/mL, then radiating for 30min by ultraviolet light with the wavelength of 365nm, centrifuging for 30min at 10000rpm, collecting particles, and washing for 3 times by water to obtain the silver nanoparticles.
The iturin A is a cyclic lipopeptide antibiotic produced by bacillus bacteria, CAS: 52229-90-0, available from Western Bao Biotechnology (Shanghai) Inc.
Example 4
The preparation method of the recyclable composite packaging bag comprises the following steps:
s1 preparation of hydrophobic paper: weighing 15g of carnauba wax, adding the carnauba wax into 500mL of chloroform, uniformly mixing to obtain a carnauba wax solution, heating to 50 ℃ until the carnauba wax solution is completely dissolved, then putting 25g of filter paper into the molten carnauba wax solution, soaking at 50 ℃ for 3h, taking out, flatly paving in 75mL of ethanol water solution with volume fraction of 85%, solidifying for 2h, taking out, and naturally drying at the room temperature;
s2 preparing a surface coating: dissolving 40 parts by weight of lignin in DMSO, adding 8 parts by weight of toluene diisocyanate and 0.5 part by weight of dibutyltin dilaurate for curing reaction to form a prepolymer, adding 40 parts by weight of polyethylene glycol into the prepolymer for further crosslinking, adding 0.15 part by weight of silver nanoparticles into the mixture, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (3) integrally and uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1 by using a ZY-TB-B4 wire bar scraper, drying at 108 ℃ for 12 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
The silver nanoparticles are prepared by the following method: adding 1mL of silver nitrate aqueous solution with the concentration of 0.1mg/mL into 2mL of iturin A aqueous solution with the concentration of 1mg/mL, then radiating for 30min by ultraviolet light with the wavelength of 365nm, centrifuging for 30min at 10000rpm, collecting particles, washing for 3 times by using water to obtain silver nanoparticles, wherein the iturin A is cyclic lipopeptide antibiotic generated by bacillus bacteria and purchased from Xibao biological technology (Shanghai) corporation.
Example 5
The preparation method of the recyclable composite packaging bag comprises the following steps:
s1 preparation of hydrophobic paper: weighing 15g of carnauba wax, adding the carnauba wax into 500mL of chloroform, uniformly mixing to obtain a carnauba wax solution, heating to 50 ℃ until the carnauba wax solution is completely dissolved, then putting 25g of filter paper into the molten carnauba wax solution, soaking at 50 ℃ for 3h, taking out, flatly paving in 75mL of ethanol water solution with volume fraction of 85%, solidifying for 2h, taking out, and naturally drying at the room temperature;
s2 preparing a surface coating: dissolving 40 parts by weight of lignin in DMSO, adding 3 parts by weight of hexamethylene diisocyanate, 5 parts by weight of toluene diisocyanate and 0.5 part by weight of dibutyltin dilaurate, carrying out curing reaction to form a prepolymer, adding 40 parts by weight of polyethylene glycol into the prepolymer for further crosslinking, adding 0.15 part by weight of silver nanoparticles into the mixture, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (3) integrally and uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1 by using a ZY-TB-B4 wire bar scraper, drying at 108 ℃ for 12 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
The silver nanoparticles (50nm-80nm) were purchased from Wuhan La Na Bai pharmaceutical chemical Co.
Comparative example 1
The preparation method of the recyclable composite packaging bag comprises the following steps:
s1 preparation of hydrophobic paper: weighing 15g of carnauba wax, adding the carnauba wax into 500mL of chloroform, uniformly mixing to obtain a carnauba wax solution, heating to 50 ℃ until the carnauba wax solution is completely dissolved, then putting 25g of filter paper into the molten carnauba wax solution, soaking at 50 ℃ for 3h, taking out, flatly paving in 75mL of ethanol water solution with volume fraction of 85%, solidifying for 2h, taking out, and naturally drying at the room temperature;
s2 preparation of surface coating: dissolving 40 parts by weight of lignin in DMSO, adding 0.5 part by weight of dibutyltin dilaurate and 40 parts by weight of polyethylene glycol, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (3) integrally and uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1 by using a ZY-TB-B4 wire bar scraper, drying at 108 ℃ for 12 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
Comparative example 2
The preparation method of the recyclable composite packaging bag comprises the following steps:
s1 preparation of hydrophobic paper: weighing 15g of carnauba wax, adding the carnauba wax into 500mL of chloroform, uniformly mixing to obtain a carnauba wax solution, heating to 50 ℃ until the carnauba wax solution is completely dissolved, then putting 25g of filter paper into the molten carnauba wax solution, soaking at 50 ℃ for 3h, taking out, flatly paving in 75mL of ethanol water solution with volume fraction of 85%, solidifying for 2h, taking out, and naturally drying at the room temperature;
s2 preparing a surface coating: dissolving 40 parts by weight of lignin in DMSO, adding 0.5 part by weight of dibutyltin dilaurate, 40 parts by weight of polyethylene glycol and 0.15 part by weight of silver nanoparticles into the mixture, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (3) integrally and uniformly coating the surface coating solution prepared in the step S2 on the surface of the hydrophobic paper prepared in the step S1 by using a ZY-TB-B4 wire bar scraper, drying at 108 ℃ for 12 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
The silver nanoparticles (50nm-80nm) were purchased from Wuhan La Na Bai pharmaceutical chemical Co.
Test example 1
The composite hydrophobic paper obtained in examples 1 to 5 and comparative examples 1 to 2 was subjected to an antibacterial test by the following method: single colonies of Escherichia coli (ATCC 8739), Staphylococcus aureus (ATCC25923) and Salmonella typhimurium (ATCC 14028) were picked up into a meat peptone medium which had been sterilized, and cultured at 37 ℃ for 12 hours at 180r/min to serve as a test bacterium solution. The composite hydrophobic paper sheet (0.1 g/sheet) after being autoclaved at 121 ℃ and 5mL of test bacterial liquid (about 10)6cfu/mL) and reacted at 37 ℃ for 3h at 180 r/min. After that, the pair of the already actedThe bacterial suspension of (2) was serially diluted, and the diluted solution was applied to an LB solid medium to count colonies. At least three replicates of each sample were run.
The inhibition (GI) against e.coli, s.aureus and s.typhimurium can be calculated by the following formula:
wherein A represents the colony number of the blank control, and B represents the colony number of the test sample.
Table 1 composite hydrophobic paper bacteriostatic ratio test results
The nano silver is an effective antibacterial agent, and the silver nanoparticles are introduced into the lignin-based polyurethane coating by utilizing the metal coordination advantage of the lignin, so that the packaging performance is further improved. However, the antibacterial effect of the nano-silver is in direct proportion to the addition amount of the nano-silver, but the content of the nano-silver in the material for food packaging is not too high, so on the basis, the silver nanoparticles are modified, and the iturin A and the silver nitrate are compounded, so that the addition of the nano-silver can be reduced while the same effect is achieved. Iturin a is a cyclic lipopeptide with a fatty acid chain and a phenolic group, which can generate superoxide radical through the phenolic group and then help silver ions form silver nanoparticles under the mediation of ultraviolet radiation. The nano silver particles prepared from iturin A are applied to paper packaging, can effectively inhibit various food-borne pathogenic bacteria, and show higher antibacterial activity, lower silver concentration and wider antibacterial spectrum compared with the common nano silver particles.
Test example 2
Thermogravimetric analysis tests were performed on the recyclable composite packaging bags of examples 1-5 and comparative examples 1-2 on a TG209F1 thermogravimetric analyzerN2And then heating from 30 to 600 ℃ at the speed of 10 ℃/min to obtain a thermogravimetric curve of the composite packaging bag, and recording the initial thermal decomposition temperature Ti and the fastest thermal degradation temperature Tmax in thermal decomposition. The test results are shown in Table 2
Table 2 thermal degradation test result table for packing bag
| Examples | Ti/℃ | Tmax/℃ |
| Example 1 | 303.0 | 360.8 |
| Example 2 | 320.9 | 385.3 |
| Example 3 | 305.8 | 361.4 |
| Example 4 | 307.2 | 362.5 |
| Example 5 | 309.2 | 370.2 |
| Comparative example 1 | 251.5 | 291.2 |
| Comparative example 2 | 274.6 | 305.7 |
Under the catalysis of dibutyltin dilaurate serving as a catalyst, the-OH in lignin and polyethylene glycol and the-NCO in toluene diisocyanate are condensed to form a carbamate bond (-COONH-), hexamethylene diisocyanate and toluene diisocyanate are compounded in the lignin modification process to improve the thermal stability of the surface coating, probably because lignin and hexamethylene diisocyanate both contain a large amount of aromatic structures, a large amount of residual carbon can be generated after pyrolysis, and the high reaction activity of hexamethylene diisocyanate and the coordination of silver nanoparticles and-OH enable the crosslinking to be tighter, so that the effect of improving the thermal stability of the packaging bag can be achieved.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the above teachings. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. The recyclable composite packaging bag is characterized by being prepared by the following method:
s1, preparing hydrophobic paper;
s2, preparing a surface coating;
and S3 coating and forming.
2. The recyclable composite packaging bag is characterized by being prepared by the following method:
s1 preparation of hydrophobic paper: weighing carnauba wax, adding the carnauba wax into chloroform to prepare a 2-4 wt% carnauba wax solution, and heating to 50-60 ℃; then, putting the filter paper into a carnauba wax solution, soaking for 2-4 hours at 50-60 ℃, taking out, putting into an ethanol water solution with the volume fraction of 75-85%, solidifying for 2-3 hours, taking out, and naturally drying to obtain hydrophobic paper;
s2 preparing a surface coating: dissolving 30-50 parts by weight of lignin in dimethyl sulfoxide, adding a curing agent and a catalyst to react to form a prepolymer, and adding polyethylene glycol into the prepolymer to mix uniformly to obtain a surface coating solution;
s3 coating and forming: and (4) uniformly coating the surface coating solution prepared in the step (S2) on the surface of the hydrophobic paper prepared in the step (S1), drying at 103-108 ℃ for 12-20 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
3. The recyclable composite packaging bag is characterized by being prepared by the following method:
s1 preparation of hydrophobic paper: weighing carnauba wax, adding the carnauba wax into chloroform to prepare a 2-4 wt% carnauba wax solution, and heating to 50-60 ℃; then, putting the filter paper into a carnauba wax solution, soaking for 2-4 hours at 50-60 ℃, taking out, putting into an ethanol water solution with the volume fraction of 75-85%, solidifying for 2-3 hours, taking out, and naturally drying to obtain hydrophobic paper;
s2 preparing a surface coating: dissolving 30-50 parts by weight of lignin in dimethyl sulfoxide, adding a curing agent and a catalyst to react to form a prepolymer, adding polyethylene glycol into the prepolymer, adding 0.15-0.3 part by weight of silver nanoparticles, and uniformly mixing to obtain a surface coating solution;
s3 coating and forming: and (4) uniformly coating the surface coating solution prepared in the step (S2) on the surface of the hydrophobic paper prepared in the step (S1), drying at 103-108 ℃ for 12-20 hours to obtain composite hydrophobic paper, and further cutting and molding the composite hydrophobic paper to obtain the composite packaging bag.
4. The recyclable composite packaging bag of claim 2 or 3, wherein: the mass-to-volume ratio of the filter paper to the ethanol aqueous solution in the step S1 is 25: (65-80) g/mL.
5. The recyclable composite packaging bag of claim 2 or 3, wherein: the mass ratio of polyethylene glycol to lignin in step S2 is 1: (1-1.2).
6. The recyclable composite packaging bag of claim 2 or 3, wherein: the curing agent in the step S2 is a mixture of hexamethylene diisocyanate and toluene diisocyanate.
7. The recyclable composite packaging bag of claim 6, wherein: the mass ratio of the hexamethylene diisocyanate to the toluene diisocyanate is 3: (5-6).
8. The recyclable composite packaging bag of claim 2 or 3, wherein: the catalyst in the step S2 is dibutyltin dilaurate.
9. The recyclable composite packaging bag of claim 8, wherein: the addition amount of the dibutyltin dilaurate is 0.5-2 parts by weight.
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