CN103112226B - Seven-layer co-extrusion high-isolating hyaline membrane and preparation method thereof - Google Patents
Seven-layer co-extrusion high-isolating hyaline membrane and preparation method thereof Download PDFInfo
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Abstract
Seven-layer co-extrusion high-isolating hyaline membrane and preparation method thereof.The invention provides a kind of high-barrier transparency film, comprise the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively.Present invention also offers a kind of preparation method of high-barrier transparency film, comprise: by polyethylene, binder resin and ethylene-vinyl alcohol copolymer co-extrusion modling, obtain the tempreature bulb comprising the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively; By described tempreature bulb Blown Film, cooling and shaping; The outer layer surface of the film after described cooling and shaping is carried out sided corona treatment, obtains high-barrier transparency film.High-barrier transparency film provided by the invention has the moist and low temperature heat seal of good transparency, mechanical strength, oxygen barrier, resistance, and not only barrier property is stablized, and planarization is better.
Description
Technical field
The invention belongs to field of packaging material, particularly relate to a kind of high-barrier transparency film and preparation method thereof.
Background technology
Along with the progress of Chemical Engineering Technology, the functionalization development trend of plastic film is day by day obvious, and wherein, high-barrier plastic film is one of function film with fastest developing speed at present.High-resistant diaphragm refers to that protection package is content-filled, avoids the small-molecule substance such as pollutant and oxygen, steam, liquid and smell to infiltrate, the packing film that simultaneously also can prevent pack content from oozing out.The high barrier of high-resistant diaphragm refer to 23 DEG C, under the standard state of 65% relative humidity, the transit dose < 5ml/m of oxygen
2below day, the transit dose < 2g/m of water vapour
2d.
Traditional high-resistant diaphragm adopts plastic-aluminum combined film production usually, although barrier property is outstanding, but it is several all over bonding to need to adopt adhesive to carry out, not only manufacturing procedure is many, cost is high, environmental pollution is large, and the aluminium foil that composite membrane uses, be easy to after bending produce fracture, greatly reduce the barrier of high-resistant diaphragm.But, the high-resistant diaphragm of plastic-aluminum combined film production is not only difficult to recycling due to plastic-aluminum combined together, and not there is the transparency, the occasion requiring transparent packaging material cannot be applied to, as meat product packaging, dairy products, flood the packaging of the products such as spiced and stewed food, bean product, sauce, medical products, cosmetics, tealeaves, chemical reagent, agricultural chemicals, spices, pet food.Along with the raising that consumer requires the packing of product, high-barrier transparency film becomes one of focus of domestic and international wrapping enterprise research.
Currently available technology discloses the good transparent resin of multiple barrier property, as vinylidene chloride copolymer (PVDC), acrylonitrile polymers (PAN), ethylene-vinyl alcohol copolymer (EVOH), polyester terephthalate (PET), crystallinity polyamide etc.In phase early 1990s, high-barrier transparency film mainly adopts coating to produce, and namely coats the resins such as PVDC, EVOH of transparency high separation at polymeric film surface, but, these cated high-barrier transparency film can not meet instructions for use, as poor in its boiling resistance.The mid-90 in 20th century rises, researcher starts primary study transparency high separation composite membrane, namely with single thin films such as PET, PA, PP, PE, EVOH, PVDC for raw material, by dry type compound, extrude the production that the techniques such as compound carry out transparency high separation composite membrane, as the films such as coating PVDC film, evaporation oxidation film, EVOH resin co-extrusion film can be obtained transparency high separation composite membrane through one or many compound.But, dry type compound, extrude in high-barrier transparency film that the techniques such as compound obtain and remain a large amount of double solvents, not only can cause environmental pollution, and production cost is higher.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of high-barrier transparency film and preparation method thereof, preparation method provided by the invention comparatively environmental protection, and the high-barrier transparency film obtained is transparent and barrier property is all better.
The invention provides a kind of high-barrier transparency film, comprise the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively.
Preferably, described first polyethylene layer is made up of low density polyethylene (LDPE) and LLDPE.
Preferably, the mass ratio of described low density polyethylene (LDPE) and LLDPE is (30 ~ 70): (30 ~ 70).
Preferably, described second polyethylene layer is made up of low density polyethylene (LDPE) and LLDPE.
Preferably, the mass ratio of described low density polyethylene (LDPE) and LLDPE is (30 ~ 70): (30 ~ 70).
Preferably, in described ethylene-vinyl alcohol copolymer, the mass percent of ethene segment is 25% ~ 45%.
Preferably, described 3rd polyethylene layer is made up of low density polyethylene (LDPE) and LLDPE.
Preferably, described 4th polyethylene layer is made up of low density polyethylene (LDPE), metallocene linear low density polyethylene, linear low density polyethylene (LLDPE) and additive.
Present invention also offers a kind of preparation method of high-barrier transparency film, comprise the following steps:
By polyethylene, binder resin and ethylene-vinyl alcohol copolymer co-extrusion modling, obtain the tempreature bulb comprising the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively;
By described tempreature bulb Blown Film, cooling and shaping;
The outer layer surface of the film after described cooling and shaping is carried out sided corona treatment, obtains high-barrier transparency film.
Preferably, the blow-up ratio of described Blown Film is 1.5 ~ 2.5.
Compared with prior art, the invention provides a kind of high-barrier transparency film, comprise the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively.In described high-barrier transparency film, ethylene-vinyl alcohol copolymer has good oxygen resistance, can prevent oxygen from infiltrating; Polyethylene has good moisture barrier property, can prevent the infiltrations such as steam; Polyethylene has good low-temperature heat-sealing performance simultaneously, can be used as the internal layer of high-barrier transparency film; Polyethylene also has good mechanical performance, can be used as skin.High-barrier transparency film provided by the invention has the moist and low temperature heat seal of good transparency, mechanical strength, oxygen barrier, resistance, and be suitable for use as transparency high barrier packaging material, not only barrier property is stablized, and planarization is better.In addition, also good barriering effect can be had during high-barrier transparency film thinner thickness provided by the invention.Experiment shows, the oxygen transmission rate of high-barrier transparency film provided by the invention is 2.0cc/m
2below 24h, rate of perviousness is 1.30g/m
2below 24h, high-barrier transparency film provided by the invention 70 μm is thick can replace 12 μm of PET, 12 μm of VMPET(aluminized mylars with the composite membrane of 12 μm of PET compounds) and 70 μm of PE sandwich diaphragms use, its barrier property is suitable, but thinner thickness, the film of 12.77% can be saved.
Accompanying drawing explanation
Fig. 1 is the structural representation of high-barrier transparency film provided by the invention.
Detailed description of the invention
The invention provides a kind of high-barrier transparency film, comprise the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively.
In high-barrier transparency film provided by the invention, ethylene-vinyl alcohol copolymer (EVOH) has good oxygen resistance, can prevent oxygen from infiltrating; Polyethylene (PE) has good moisture barrier property, can prevent the infiltrations such as steam; Polyethylene has good low-temperature heat-sealing performance simultaneously, can be used as the internal layer of high-barrier transparency film; Polyethylene also has good mechanical performance, can be used as skin.
See Fig. 1, Fig. 1 is the structural representation of high-barrier transparency film provided by the invention, wherein, 11 be the first polyethylene layer, 12 is the second polyethylene layer, 13 be the first bonding resin layer, 14 is the 3rd polyethylene layer for evoh layer, 15 is the second bonding resin layer, 16, and 17 is the 4th polyethylene layer.
High-barrier transparency film provided by the invention comprises the first polyethylene layer, described first polyethylene layer is made up of polyethylene, can be low density polyethylene (LDPE), LLDPE, medium density polyethylene etc., preferably be made up of low density polyethylene (LDPE) and LLDPE, described low density polyethylene (LDPE) and LLDPE mass ratio are preferably (30 ~ 70): (30 ~ 70), are more preferably (40 ~ 60): (40 ~ 60).Described polyethylene has good mechanical performance and printing performance, can be used as the skin of high-barrier transparency film.In the present invention, the thickness of described first aramid layer is preferably 10 μm ~ 20 μm, is more preferably 12 μm ~ 18 μm.
High-barrier transparency film provided by the invention also comprises the second polyethylene layer contacted with described first polyethylene layer, described second polyethylene layer is made up of polyethylene, can be low density polyethylene (LDPE), LLDPE, medium density polyethylene etc., preferably be made up of low density polyethylene (LDPE) and LLDPE, described low density polyethylene (LDPE) and LLDPE mass ratio are preferably (30 ~ 70): (30 ~ 70), are more preferably (40 ~ 60): (40 ~ 60).Polyethylene is better to the barrier of polar water steam, and the resistance that can improve the high-barrier transparency film obtained is moist.In the present invention, the thickness of described second polyethylene layer is preferably 5 μm ~ 15 μm, is more preferably 8 μm ~ 12 μm.
In order to make nonpolar polyethylene be combined with polar ethylene-ethenol copolymer, described high-barrier transparency film also comprises the first bonding resin layer contacted with described second polyethylene layer, and described first bonding resin layer is made up of binder resin.The present invention is not particularly limited described binding resin, includes but not limited to the polymer of the polymer of modified by maleic acid anhydride graft, acrylic graft-modified polymer and acrylates graft modification.In described binding resin, the monomers such as maleic anhydride, acrylic acid, acrylates are formation official energy side chain on poly main chain, these side chains can rapidly, efficiently with polar resin generation chemical reaction, form covalent bond, hydrogen bond, van der waals force etc., polar polymer and non-polar polymer are bonded together.In the present invention, the thickness of described first bonding resin layer is preferably 3 μm ~ 10 μm, is more preferably 4 μm ~ 8 μm.
High-barrier transparency film provided by the invention also comprises the evoh layer contacted with described first bonding resin layer, and described ethylene-vinyl alcohol copolymer has good oxygen resistance, can improve the barrier property of described high-barrier transparency film.Described evoh layer is formed by ethylene-vinyl alcohol copolymer, and described ethylene-vinyl alcohol copolymer is the copolymer of vinyl alcohol and ethene, and English name is EVOH.In the present invention, in described ethylene-vinyl alcohol copolymer, the mass percent of described ethene segment is preferably 25% ~ 45%, is more preferably 30% ~ 40%.In the present invention, the thickness of described evoh layer is preferably 3 μm ~ 20 μm, is more preferably 5 μm ~ 15 μm, most preferably is 7 μm ~ 15 μm.The thickness of described evoh layer is comparatively large to the performance impact of the high-barrier transparency film obtained, and when thickness is too thin, the oxygen resistance of high-barrier transparency film is undesirable; When thickness is too thick, although oxygen resistance is better, can increase the consumption of resin, cost is higher.
High-barrier transparency film provided by the invention also comprise contact with described evoh layer the second bonding resin layer, described second bonding resin layer is made up of binder resin, can improve the bonding strength between evoh layer and the 3rd polyethylene layer.The present invention is not particularly limited described binding resin, includes but not limited to the polymer of the polymer of modified by maleic acid anhydride graft, acrylic graft-modified polymer and acrylates graft modification.In described binding resin, the monomers such as maleic anhydride, acrylic acid, acrylates are formation official energy side chain on poly main chain, these side chains can rapidly, efficiently with polar resin generation chemical reaction, form covalent bond, hydrogen bond, van der waals force etc., polar polymer and non-polar polymer are bonded together.In the present invention, the thickness of described second bonding resin layer is preferably 3 μm ~ 10 μm, is more preferably 4 μm ~ 8 μm.
High-barrier transparency film provided by the invention also comprises the 3rd polyethylene layer contacted with described second bonding resin layer, described 3rd polyethylene layer is made up of polyethylene, can be low density polyethylene (LDPE), LLDPE, medium density polyethylene etc., preferably be made up of low density polyethylene (LDPE) and LLDPE, described low density polyethylene (LDPE) and LLDPE mass ratio are preferably (30 ~ 70): (30 ~ 70), are more preferably (40 ~ 60): (40 ~ 60).Polyethylene is better to the barrier of polar water steam, and the resistance that can improve the high-barrier transparency film obtained is moist.In the present invention, the thickness of described 3rd polyethylene layer is preferably 5 μm ~ 15 μm, is more preferably 8 μm ~ 12 μm.
High-barrier transparency film provided by the invention also comprises the 4th polyethylene layer contacted with described 3rd polyethylene layer, described polyethylene layer has good low-temperature heat-sealing performance and moisture barrier property, can be used as the internal layer of high-barrier transparency film, prevent the infiltration of moisture and improve the low-temperature heat-sealing performance of high-barrier transparency film.In the present invention, described polyethylene layer is preferably made up of low density polyethylene (LDPE), metallocene linear low density polyethylene, linear low density polyethylene (LLDPE) and additive, the mass ratio of described low density polyethylene (LDPE), metallocene linear low density polyethylene and linear low density polyethylene (LLDPE) is preferably (1.2 ~ 2.5): 1: 1, is more preferably (1.5 ~ 2): 1:1.In the present invention, described additive comprises opening agent (AB) and slipping agent (SL), and the mass ratio of described opening agent and slipping agent is preferably 1:1.5.
In order to improve the transparency of described 4th polyethylene layer, described 4th polyethylene layer preferably also comprises fluorine-containing auxiliary agent, as fluorine-containing auxiliary agent PPA etc.Fluorine-containing auxiliary agent can reduce the friction of resin melt and metal cylinder, reduces the water ripples of the film surface formed because of fricative melt fracture.In the present invention, the mass percent of described fluorine-containing auxiliary agent is preferably 2% ~ 3%, is more preferably 2.5%.The thickness of described 4th polyethylene layer is preferably 10 μm ~ 20 μm, is more preferably 12 μm ~ 18 μm.
The invention provides a kind of high-barrier transparency film, comprise the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively.In described high-barrier transparency film, ethylene-vinyl alcohol copolymer has good oxygen resistance, can prevent oxygen from infiltrating; Polyethylene has good moisture barrier property, can prevent the infiltrations such as steam; Polyethylene has good low-temperature heat-sealing performance simultaneously, can be used as the internal layer of high-barrier transparency film; Polyethylene also has good mechanical performance, can be used as skin.High-barrier transparency film provided by the invention has the moist and low temperature heat seal of good transparency, mechanical strength, oxygen barrier, resistance, and be suitable for use as transparency high barrier packaging material, not only barrier property is stablized, and planarization is better.In addition, also good barriering effect can be had during high-barrier transparency film thinner thickness provided by the invention.Experiment shows, the oxygen transmission rate of high-barrier transparency film provided by the invention is 2.0cc/m
2below 24h, rate of perviousness is 1.30g/m
2below 24h, high-barrier transparency film provided by the invention 70 μm is thick can replace 12 μm of PET, 12 μm of VMPET(aluminized mylars with the composite membrane of 12 μm of PET compounds) and 70 μm of PE sandwich diaphragms use, its barrier property is suitable, but thinner thickness, the film of 12.77% can be saved.
The present invention is to raw materials such as described polyethylene, ethylene-vinyl alcohol copolymer, binder resins all without special restriction, and product well known to those skilled in the art, all can directly buy from the market.
Present invention also offers a kind of preparation method of high-barrier transparency film, comprise the following steps:
By polyethylene, binder resin and ethylene-vinyl alcohol copolymer co-extrusion modling, obtain the tempreature bulb comprising the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively;
By described tempreature bulb Blown Film, cooling and shaping;
The outer layer surface of the film after described cooling and shaping is carried out sided corona treatment, obtains high-barrier transparency film.
The present invention adopts coextrusion blow technique to prepare high-barrier transparency film, and production process is comparatively simple.
First by the material resin of composition first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer, namely the feeding such as polyethylene, ethylene-vinyl alcohol copolymer, binder resin screw extruder carries out co-extrusion modling, is comprised the tempreature bulb of the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer successively.The present invention is not particularly limited described screw extruder, and those skilled in the art can carry out the adjustment of coextrusion parameter according to the performance of used screw extruder model and target clear high-resistant diaphragm.
Blown Film well known to those skilled in the art, cooling and shaping are carried out to described tempreature bulb.In order to make the film obtained have good mechanical property and barrier property, when carrying out blowing, blow-up ratio is preferably 1 ~ 3, is more preferably 1.5 ~ 2.5.Those skilled in the art can carry out the adjustment of blowing parameter according to the blow moulding equipment model used and the performance of target clear high-resistant diaphragm.
After blowing obtains film, sided corona treatment is carried out to the outer layer surface of described film, improve the tack of high-barrier transparency film.Those skilled in the art can carry out the adjustment of sided corona treatment parameter according to the corona unit type used and the performance of target clear high-resistant diaphragm.
In order to improve the processing characteristics of high-barrier transparency film, described high-barrier transparency film is the film with the first polyethylene layer 11/ second polyethylene layer 12/ first bonding resin layer 13/ evoh layer 14/ second bonding resin layer 15/ the 3rd polyethylene layer 16/ the 4th polyethylene layer 17 structure.The present invention adopts seven-layer co-extrusion blow molding process to carry out the preparation of this film, directly obtains the high-barrier transparency film with 7 Rotating fields.
Seven-layer co-extrusion blow molding process and above-mentioned coextrusion blow technique similar, in order to obtain high-barrier transparency film of good performance, those skilled in the art can adjust coextrusion parameter, blowing parameter and corona parameter.
After obtaining high-barrier transparency film, carry out barrier property test to described high-barrier transparency film, result shows, the oxygen transmission rate of high-barrier transparency film provided by the invention is 2.0cc/m
2below 24h, rate of perviousness is 1.30g/m
2below 24h, high-barrier transparency film provided by the invention 70 μm is thick can replace 12 μm of PET, 12 μm of VMPET(aluminized mylars with the composite membrane of 12 μm of PET compounds) and 70 μm of PE sandwich diaphragms use, its barrier property is suitable, but thinner thickness, the film of 12.77% can be saved.
The invention provides a kind of high-barrier transparency film, comprise the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively.In described high-barrier transparency film, ethylene-vinyl alcohol copolymer has good oxygen resistance, can prevent oxygen from infiltrating; Polyethylene has good moisture barrier property, can prevent the infiltrations such as steam; Polyethylene has good low-temperature heat-sealing performance simultaneously, can be used as the internal layer of high-barrier transparency film; Polyethylene also has good mechanical performance, can be used as skin.High-barrier transparency film provided by the invention has the moist and low temperature heat seal of good transparency, mechanical strength, oxygen barrier, resistance, and be suitable for use as transparency high barrier packaging material, not only barrier property is stablized, and planarization is better.In addition, also good barriering effect can be had during high-barrier transparency film thinner thickness provided by the invention.
In order to further illustrate the present invention, below in conjunction with embodiment, high-barrier transparency film provided by the invention and preparation method thereof is described in detail.
In following embodiment, raw materials used being is buied from the market, and its detailed performance parameter is in table 1, and table 1 is the raw materials used performance parameter of the embodiment of the present invention.
The raw materials used performance parameter of table 1 embodiment of the present invention
In following embodiment, used test instrument is: MOCON company of the U.S. produces, the oxygen flow tester of model OX-TRAV702; MOCON company of the U.S. produces, and model is the moisture-inhibiting tester of 3/61; Former Shanghai the 3rd optical instrument factory produces, and model is the photoelectricity mist degree instrument of WGW;
In following embodiment, examination criteria used is: mist degree is by GB/T2410-2008 standard detection; Oxygen transmission rate presses GB/T19789-2005 standard detection; Rate of perviousness presses ASTM F1249-1990 standard detection.
Embodiment 1 ~ 4
On that produce with German W & H company, that model is VAREX seven-layer co-extrusion, blow moulding equipment carries out the preparation of high-barrier transparency film:
In seven barrels of described seven-layer co-extrusion blowing up equipment, add the first polyethylene layer raw material (being designated as Y1), the second polyethylene layer raw material (being designated as Y2), the first bonding resin layer raw material (being designated as Y3), evoh layer raw material (being designated as Y4), the second bonding resin layer raw material (being designated as Y5), the 3rd polyethylene layer raw material (being designated as Y6) and the 4th polyethylene layer raw material (being designated as Y7) respectively, each raw material is specifically filled a prescription in table 2.
Carry out blowing after raw material in 7 barrels is carried out coextrusion, blow-up ratio is respectively 1.5,2.0,2.5 and 3.0, and controls each layer thickness, and each layer thickness is in table 2.
The raw materials used formula of each layer of high-barrier transparency film prepared by table 2 embodiment 1 ~ 4
After blowing obtains film, sided corona treatment is carried out to the outer layer surface of described film, obtains high-barrier transparency film.
Heat sealability test is carried out to described high-barrier transparency film, result see table 3, the barrier property test result of the high-barrier transparency film that table 3 provides for the embodiment of the present invention.
The barrier property test result of the high-barrier transparency film that table 3 embodiment of the present invention provides
As shown in Table 3, high-barrier transparency film provided by the invention has the moist and low temperature heat seal of good transparency, mechanical strength, oxygen barrier, resistance, and be suitable for use as transparency high barrier packaging material, not only barrier property is stablized, and planarization is better.
Embodiment 5
70 μm that embodiment 1 are prepared thick high-barrier transparency film and 12 μm of thick PET film compounds, obtain composite membrane; Performance test is carried out to described composite membrane, result see table 4, the performance test results of the composite membrane that table 4 provides for the embodiment of the present invention and comparative example.
Comparative example 1
By PET film compound thick with 12 μm again after 12 μm of thick VMPET and 70 μm of thick PE compounds, obtain composite membrane; Performance test is carried out to described composite membrane, result see table 4, the performance test results of the composite membrane that table 4 provides for the embodiment of the present invention and comparative example.
The performance test results of the composite membrane that table 4 embodiment of the present invention and comparative example provide
As shown in Table 4, high-barrier transparency film provided by the invention 70 μm is thick can replace 12 μm of PET, 12 μm of VMPET(aluminized mylars with the composite membrane of 12 μm of PET compounds) and 70 μm of PE sandwich diaphragms use, its barrier property is suitable, but thinner thickness, the film of 12.77% can be saved.In addition, it also can save one combination process, can reduce the consumption of composite glue.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. a high-barrier transparency film, comprises the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively;
Described first polyethylene layer is made up of low density polyethylene (LDPE) and LLDPE; The mass ratio of described low density polyethylene (LDPE) and LLDPE is (30 ~ 70): (30 ~ 70);
Described second polyethylene layer is made up of low density polyethylene (LDPE) and LLDPE; The mass ratio of described low density polyethylene (LDPE) and LLDPE is (30 ~ 70): (30 ~ 70);
Described first bonding resin layer is made up of binder resin, and described second bonding resin layer is made up of binder resin, and described binder resin is the polymer of the polymer of modified by maleic acid anhydride graft, acrylic graft-modified polymer or acrylates graft modification;
Described evoh layer is made up of ethylene-vinyl alcohol copolymer, and described ethylene-vinyl alcohol copolymer is the copolymer of vinyl alcohol and ethene, and in described ethylene-vinyl alcohol copolymer, the mass percent of described ethene segment is 25% ~ 45%;
Described 3rd polyethylene layer is made up of low density polyethylene (LDPE) and LLDPE; The mass ratio of described low density polyethylene (LDPE) and LLDPE is (30 ~ 70): (30 ~ 70);
Described 4th polyethylene layer is made up of low density polyethylene (LDPE), metallocene linear low density polyethylene, linear low density polyethylene (LLDPE), additive and fluorine-containing auxiliary agent; The mass ratio of described low density polyethylene (LDPE), metallocene linear low density polyethylene and linear low density polyethylene (LLDPE) is (1.2 ~ 2.5): 1:1; Described additive comprises opening agent and slipping agent, and the mass ratio of described opening agent and slipping agent is 1:1.5; In described 4th polyethylene layer, the mass percent of described fluorine-containing auxiliary agent is 2% ~ 3%.
2. a preparation method for high-barrier transparency film as claimed in claim 1, comprises the following steps:
By polyethylene, binder resin and ethylene-vinyl alcohol copolymer co-extrusion modling, obtain the tempreature bulb comprising the first polyethylene layer, the second polyethylene layer, the first bonding resin layer, evoh layer, the second bonding resin layer, the 3rd polyethylene layer and the 4th polyethylene layer that contact successively;
By described tempreature bulb Blown Film, cooling and shaping;
The outer layer surface of the film after described cooling and shaping is carried out sided corona treatment, obtains high-barrier transparency film.
3. preparation method according to claim 2, is characterized in that, the blow-up ratio of described Blown Film is 1.5 ~ 2.5.
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| CN114407460B (en) * | 2022-01-28 | 2023-07-04 | 佛山市南海利达印刷包装有限公司 | High barrier film and method for producing the same |
| CN114670520A (en) * | 2022-03-31 | 2022-06-28 | 合肥无涯科技有限公司 | High-barrier puncture-resistant membrane material for bioprocess bag and preparation method thereof |
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| JPH07117181A (en) * | 1993-10-27 | 1995-05-09 | Sumitomo Bakelite Co Ltd | Multi-layer oriented film |
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| CN2841555Y (en) * | 2005-11-17 | 2006-11-29 | 张晓明 | Polyvinyl alcohol seven-layer coextruded plastic composite packing film |
| CN102700210A (en) * | 2012-06-12 | 2012-10-03 | 黄山永新股份有限公司 | Seven-layer co-extrusion transparent high-isolation film and preparation method thereof |
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