CN1857918A - Method for preparing high obstruction self assembling multilayer composite film - Google Patents
Method for preparing high obstruction self assembling multilayer composite film Download PDFInfo
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- CN1857918A CN1857918A CN 200610051697 CN200610051697A CN1857918A CN 1857918 A CN1857918 A CN 1857918A CN 200610051697 CN200610051697 CN 200610051697 CN 200610051697 A CN200610051697 A CN 200610051697A CN 1857918 A CN1857918 A CN 1857918A
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- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 9
- 229920000867 polyelectrolyte Polymers 0.000 claims abstract description 57
- 239000000463 material Substances 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010408 film Substances 0.000 claims description 108
- 150000001875 compounds Chemical class 0.000 claims description 23
- 238000001179 sorption measurement Methods 0.000 claims description 22
- -1 polyethylene Polymers 0.000 claims description 21
- 125000002091 cationic group Chemical group 0.000 claims description 19
- 239000004698 Polyethylene Substances 0.000 claims description 18
- 238000001338 self-assembly Methods 0.000 claims description 18
- 229920001448 anionic polyelectrolyte Polymers 0.000 claims description 16
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 239000010409 thin film Substances 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 235000010413 sodium alginate Nutrition 0.000 claims description 9
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 8
- 229940005550 sodium alginate Drugs 0.000 claims description 8
- 239000000661 sodium alginate Substances 0.000 claims description 8
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 229920006267 polyester film Polymers 0.000 claims description 5
- 229920001661 Chitosan Polymers 0.000 claims description 4
- 238000003851 corona treatment Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 229920006284 nylon film Polymers 0.000 claims description 4
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 claims description 2
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 150000001450 anions Chemical class 0.000 claims description 2
- 150000001768 cations Chemical class 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 20
- 239000010410 layer Substances 0.000 description 18
- 239000012528 membrane Substances 0.000 description 10
- 238000012546 transfer Methods 0.000 description 9
- 230000004888 barrier function Effects 0.000 description 7
- 238000002203 pretreatment Methods 0.000 description 7
- 229920002799 BoPET Polymers 0.000 description 6
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 6
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 6
- 238000012856 packing Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- 229920000058 polyacrylate Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009459 flexible packaging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002982 water resistant material Substances 0.000 description 1
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention discloses preparation process of high obstruction self-assembling multilayer composite film. The multilayer composite film consists of a base material layer, a self-assembled layer and a hot sealing layer. The multilayer composite film with high oxygen and water obstruction is prepared through the steps of pre-treating the base layer for being positively or negatively charged, alternately adsorbing positively and negatively charged polyelectrolyte to form the self-assembled layer and finally compounding the hot sealing layer. The multilayer composite film has superthin self-assembled layer with high obstruction on oxygen, CO2 and other small gas molecules and traditional water obstructing material, and may be used in food and medicine industry effectively.
Description
Technical field
The present invention relates to the flexible package field, relate in particular to a kind of preparation method of high obstruction self assembling multilayer composite film.
Background technology
Along with improving constantly of people's living standard, the fresh-keeping and nutritive value of food is had higher requirement.In order to satisfy people the kind of food and the requirement of nutrition, food circulation all over the world increases, and is its corresponding, and the storage of food and shelf-life require also to have prolonged.Therefore, food processing industry has the requirement of higher barrier for the film of food casing, to guarantee the fresh taste and the quality of food.The article packing of some special industries also needs the very flexible package of high barrier, as medicine and medical supplies.Meanwhile, from the packing environmental angle, the high barrier film can effectively reduce the thickness of wrapper, helps promoting packing lightweight, thin-walled property.
The multilayer complex films that self assembly forms is by statcoulomb power, successively adsorb the self-assembled film that forms by anionic polyelectrolyte and cationic polyelectrolyte, at present at infiltrating and vaporizing membrane, fields such as reverse osmosis membrane, conducting film, biology sensor, surface modified, antistatic coating, non-line optics device have obtained extensive studies, but never are seen in report in the flexible packaging film field.
The present invention at first carries out preliminary treatment to base film, and method comprises sided corona treatment or chemical oxidation treatment.Sided corona treatment is to adopt corona machine that film surface is carried out plasma discharge, makes the film surface group that complicated chemical reaction take place; Chemical oxidation treatment mainly is to adopt chemical reagent such as the concentrated sulfuric acid or the potassium bichromate of oxidisability, and film surface is carried out oxidation.The base material that has the plus or minus electric charge through preliminary treatment is immersed in the aqueous solution of the moon or cationic polyelectrolyte, and circulation obtains multilayer self assembly male-female polyelectrolyte and base material laminated film repeatedly.Owing to combine with statcoulomb power between the negative and positive polyelectrolyte layer, according to the dissolving diffusion principle, gas molecules such as the particularly nonpolar oxygen of common little molecule, carbon dioxide are difficult to pass through.So, self-assembled film is very high for the barrier of oxygen, carbon dioxide, with negative and positive polyelectrolyte self-assembled film and traditional high water resistant material, as packaging material such as polyethylene film, polypropylene film on the dry compound machine or drench carry out on the film machine compound, can obtain the packaging material of high obstructing performance, in industries such as food, the medicine prospect that will be widely used.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of high obstruction self assembling multilayer composite film.
The step of method is as follows:
1). at first the one side of base material is carried out sided corona treatment or chemical oxidation treatment, make the surface of base material have the plus or minus electric charge;
2). again being immersed in the aqueous solution that concentration is 0.05~5g/L the moon or cationic polyelectrolyte 15~30 minutes through handling the base material have the plus or minus electric charge, negative or positive electric charge on the band of equilibrium adsorption rear surface, with deionized water flush away free the moon or cation, dry back forms a single thin film, be immersed in again in the aqueous solution of sun or anionic property polyelectrolyte 15~30 minutes, the sun or the anion that dissociate with the deionized water flush away after the equilibrium adsorption, obtain the cloudy two kinds of polyelectrolyte assembling films of pair of lamina sun after the drying, so circulation obtains multilayer self assembly negative and positive polyelectrolyte composite film;
3). with the compound high resistant oxygen self assembling multilayer composite film that blocks water that obtains of above-mentioned multilayer self assembly negative and positive polyelectrolyte composite film and hot sealing layer.
2. the preparation method of a kind of high obstruction self assembling multilayer composite film according to claim 1 is characterized in that, described base material is polyethylene film, polypropylene film, polyester film or nylon film.
Described cationic polyelectrolyte is a chitosan; Anionic polyelectrolyte is the sodium alginate Sodium Polyacrylate.Cationic polyelectrolyte is a chitosan, and the acetyl degree is greater than 90%, and concentration is 0.05~4g/L, and pH value is 3.0~5.7.Anionic polyelectrolyte is sodium alginate or Sodium Polyacrylate, concentration be 0.05~4g/L, pH value is 8~10.Hot sealing layer is polyethylene film, polypropylene film or poly-(ethylene-vinyl acetate) film.The number of plies of multilayer negative and positive polyelectrolyte component film is 5~50 layers.Multilayer self assembly negative and positive polyelectrolyte composite film and hot sealing layer composite methods are the dry type composite algorithm or extrude composite algorithm.
Advantage of the present invention
1) the present invention utilizes self-assembling technique, anionic polyelectrolyte and cationic polyelectrolyte are successively adsorbed, prepare ultra-thin self-assembled film, owing to combine with statcoulomb power between the negative and positive polyelectrolyte layer, gas molecules such as the particularly nonpolar oxygen of little molecule, carbon dioxide are difficult to pass through.So self-assembled film is very high for the barrier of oxygen, carbon dioxide, its oxygen transit dose is significantly less than the common resistance oxygen film on the market.The negative and positive polyelectrolyte self-assembled film high barrier and the traditional packaging material that block water is compound, can obtain the packaging material of high obstructing performance, effectively solve the obstruct problem of food, pharmaceuticals industry.
2) do not use any adhesive at base material and polyelectrolyte film interlayer, but form firm interface, thereby self-assembled film has the stability of height, do not discharge any organic solvent, almost without any pollution by the absorption of the statcoulomb power between electric charge.
3) utilize self-assembling technique, anionic polyelectrolyte and cationic polyelectrolyte successively adsorbed, gained negative and positive polyelectrolyte layer thickness as thin as a wafer, this method lower cost for material.
4) from the packing environmental angle, the high barrier film can effectively reduce the thickness of wrapper, helps promoting packing lightweight, thin-walled property.
The specific embodiment
For a more detailed description to the present invention below in conjunction with specific embodiment, scope of the present invention is not subjected to the restriction of these embodiment, and modification and improvement that all are made on the basis of not departing from core content of the present invention all belong to the scope of protection of present invention.Scope of the present invention proposes in claims in detail.
Embodiment 1
(PET) carries out corona pre-treatment with the substrate polyester film, make the surface of PET film have positive charge, it is that 0.05g/L, PH are in the solution of 8 sodium alginate (SPM) anionic polyelectrolyte 15 minutes that the PET film that has positive charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 0.05g/L, PH and be in the solution of 3 shitosan (CS) cationic polyelectrolyte 30 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of Yin and Yang are assembled.So circulation is 10 times, can obtain 10 layers of self assembly negative and positive polyelectrolyte membrane, and is again that self-assembled film and polyethylene heat-sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 0.48ml/m
2Day, vapor transfer rate 12.1g/m
2Day.
Embodiment 2
(PET) carries out corona pre-treatment with the substrate polyester film, make the surface of PET film have negative electrical charge, it is that 5g/L, PH are in the solution of 5.7 shitosan (CS) cationic polyelectrolyte 20 minutes that the PET film that has negative electrical charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 5g/L, PH and be in the solution of 8 sodium alginate (SPM) anionic polyelectrolyte 30 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of Yin and Yang are assembled.So circulation is 10 times, can obtain 10 layers of self assembly negative and positive polyelectrolyte membrane, and is again that self-assembled film and polyethylene heat-sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 0.08ml/m
2Day, vapor transfer rate 18.5g/m
2Day.
Embodiment 3
(PET) carries out corona pre-treatment with the substrate polyester film, make the surface of PET film have certain negative electrical charge, it is that 0.5g/L, PH are in the solution of 5 shitosan (CS) cationic polyelectrolyte 15 minutes that the PET film that has negative electrical charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 0.5g/L, PH and be in the solution of 8 Sodium Polyacrylate (PAA) anionic polyelectrolyte 30 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of Yin and Yang are assembled.So circulation is 5 times, can obtain 5 layers of self assembly negative and positive polyelectrolyte membrane, and last self-assembled film and polyethylene heat-sealing film are compound on dry compound machine, obtain high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 0.07ml/m
2Day, vapor transfer rate 17.8g/m
2Day.
Embodiment 4
(PA) carries out the potassium bichromate solution Chemical Pretreatment with the base material nylon film, make the surface of PA film have certain negative electrical charge, it is that 5g/L, PH are in the solution of 5 shitosan (CS) cationic polyelectrolyte 30 minutes that the PA film that has negative electrical charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 5g/L, PH and be in the solution of 9 Sodium Polyacrylate (PAA) anionic polyelectrolyte 20 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of Yin and Yang are assembled.So circulation is 10 times, can obtain 10 layers of self assembly negative and positive polyelectrolyte layer, so just obtains PA and self assembly 10 tunics, and is again that self-assembled film and nylon heat sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 0.11ml/m
2Day, vapor transfer rate 12.5g/m
2Day.
Embodiment 5:
(PA) carries out the potassium bichromate solution Chemical Pretreatment with the base material nylon film, make the surface of PA film have certain negative electrical charge, it is that 0.5g/L, PH are in the solution of 5.7 shitosan (CS) cationic polyelectrolyte 25 minutes that the PA film that has negative electrical charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 0.5g/L, PH and be in the solution of 8 sodium alginates (SPM) anionic polyelectrolyte 25 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of Yin and Yang are assembled.So circulation is 5 times, can obtain 5 layers of self assembly negative and positive polyelectrolyte membrane, and is again that self-assembled film and poly-nylon heat sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 0.66ml/m
2Day, vapor transfer rate 6.8g/m
2Day.
Embodiment 6
(BOPP) carries out corona pre-treatment with the base material bidirectional stretching polypropylene film, make the surface of BOPP film have certain positive charge, it is that 0.5g/L, PH are in the solution of 9 Sodium Polyacrylate (PAA) anionic polyelectrolyte that the BOPP film that has positive charge is immersed in concentration, dry after the equilibrium adsorption, form an individual layer, immerse concentration again and be 0.5g/L, PH and be in the solution of 4 shitosan (CS) cationic polyelectrolyte, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of Yin and Yang are assembled.So circulation is 10 times, can obtain 10 layers of self assembly negative and positive polyelectrolyte membrane, and is again that self-assembled film and polypropylene thermal sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 1.59ml/m
2Day, vapor transfer rate 8.4g/m
2Day.
Embodiment 7
(BOPP) carries out corona pre-treatment with the base material bidirectional stretching polypropylene film, make the surface of BOPP film have certain positive charge, it is that 0.05g/L, PH are in the solution of 10 sodium alginate (SPM) anionic polyelectrolyte 20 minutes that the BOPP film that has positive charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 0.05g/L, PH and be in the solution of 3 shitosan (CS) cationic polyelectrolyte 30 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of Yin and Yang are assembled.So circulation is 20 times, can obtain 20 layers of self assembly negative and positive polyelectrolyte membrane, and is again that self-assembled film and polypropylene thermal sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 1.37ml/m
2Day, vapor transfer rate 7.8g/m
2Day.
Embodiment 8:
(PE) carries out corona pre-treatment with the base material polyethylene film, make the surface of PE film have certain positive charge, it is that 0.5g/L, PH are in the solution of 10 sodium alginate (SPM) anionic polyelectrolyte 15 minutes that the PE film that has positive charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 0.5g/L, PH and be in the solution of 4 shitosan (CS) cationic polyelectrolyte 25 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of male-female are assembled.So circulation is 20 times, can obtain 20 layers of self assembly negative and positive polyelectrolyte membrane, and is again that self-assembled film and polyethylene heat-sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 1.42ml/m
2Day, vapor transfer rate 5.6g/m
2Day.
Embodiment 9:
(PE) carries out corona pre-treatment with the base material polyethylene film, make the surface of PE film have certain positive charge, it is that 0.05g/L, PH are in the solution of 10 Sodium Polyacrylate (PAA) anionic polyelectrolyte 20 minutes that the PE film that has positive charge is immersed in concentration, dry after the equilibrium adsorption, form a single thin film, immersed concentration again and be 0.05g/L, PH and be in the solution of 5 shitosan (CS) cationic polyelectrolyte 30 minutes, dry after the equilibrium adsorption, obtain the pair of lamina film that two kinds of polyelectrolyte of male-female are assembled.So circulation is 50 times, can obtain 50 layers of self assembly negative and positive polyelectrolyte membrane, and is again that self-assembled film and polyethylene heat-sealing film is compound on dry compound machine, obtains high obstruction self assembling multilayer composite film.After tested, oxygen transit dose 1.42ml/m
2Day, vapor transfer rate 5.6g/m
2Day.
Claims (8)
1. the preparation method of a high obstruction self assembling multilayer composite film is characterized in that, the step of method is as follows:
1). at first the one side of base material is carried out sided corona treatment or chemical oxidation treatment, make the surface of base material have the plus or minus electric charge;
2). again being immersed in the aqueous solution that concentration is 0.05~5g/L the moon or cationic polyelectrolyte 15~30 minutes through handling the base material have the plus or minus electric charge, negative or positive electric charge on the band of equilibrium adsorption rear surface, with deionized water flush away free the moon or cation, dry back forms a single thin film, be immersed in again in the aqueous solution of sun or anionic property polyelectrolyte 15~30 minutes, the sun or the anion that dissociate with the deionized water flush away after the equilibrium adsorption, obtain the cloudy two kinds of polyelectrolyte assembling films of pair of lamina sun after the drying, so circulation obtains multilayer self assembly negative and positive polyelectrolyte composite film;
3). with the compound high resistant oxygen self assembling multilayer composite film that blocks water that obtains of above-mentioned multilayer self assembly negative and positive polyelectrolyte composite film and hot sealing layer.
2. the preparation method of a kind of high obstruction self assembling multilayer composite film according to claim 1 is characterized in that, described base material is polyethylene film, polypropylene film, polyester film or nylon film.
3. the preparation method of a kind of high obstruction self assembling multilayer composite film according to claim 1 is characterized in that, described cationic polyelectrolyte is a chitosan; Anionic polyelectrolyte is the sodium alginate Sodium Polyacrylate.
4. according to the preparation method of claim 1 or 3 described a kind of high obstruction self assembling multilayer composite films, it is characterized in that described cationic polyelectrolyte is a chitosan, the acetyl degree is greater than 90%, and concentration is 0.05~4g/L, and pH value is 3.0~5.7.
5. according to the preparation method of claim 1 or 3 described a kind of high obstruction self assembling multilayer composite films, it is characterized in that described anionic polyelectrolyte is sodium alginate or Sodium Polyacrylate, concentration be 0.05~4g/L, pH value is 8~10.
6. the preparation method of a kind of high obstruction self assembling multilayer composite film according to claim 1 is characterized in that, described hot sealing layer is polyethylene film, polypropylene film or poly-(ethylene-vinyl acetate) film.
7. according to the preparation method of a kind of high obstruction self assembling multilayer composite film described in the claim 1, it is characterized in that the number of plies of described multilayer negative and positive polyelectrolyte component film is 5~50 layers.
8. according to the preparation method of a kind of high obstruction self assembling multilayer composite film described in the claim 1, it is characterized in that described multilayer self assembly negative and positive polyelectrolyte composite film and hot sealing layer composite methods are the dry type composite algorithm or extrude composite algorithm.
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