CN105034505A - High-air-barrier-property multilayer-co-extrusion heat-sealing film - Google Patents

High-air-barrier-property multilayer-co-extrusion heat-sealing film Download PDF

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Publication number
CN105034505A
CN105034505A CN201510266626.1A CN201510266626A CN105034505A CN 105034505 A CN105034505 A CN 105034505A CN 201510266626 A CN201510266626 A CN 201510266626A CN 105034505 A CN105034505 A CN 105034505A
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China
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layer
sandwich
sandwich layer
sealing film
heat
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Inventor
冯春
史保利
刘建平
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Suzhou Tianhe New Material Science & Technology Co Ltd
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Suzhou Tianhe New Material Science & Technology Co Ltd
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Priority to CN201510266626.1A priority Critical patent/CN105034505A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • 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
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form
    • B65D2565/387—Materials used as gas barriers

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  • Laminated Bodies (AREA)

Abstract

The invention discloses a high-air-barrier-property multilayer-co-extrusion heat-sealing film which includes a surface layer, a heat-sealing layer and a core layer. The core layer includes five core layers which are generated through co-extrusion. Bonding layers are used for bonding the first core layer to the surface layer, the third core layer to a fourth core layer, the fourth core layer to a fifth core layer and the fifth core layer to the heat-sealing layer. The thickness ratio of the five core layers is (1-3):(1-5):(1-4):(1-5):(1-4). The first core layer is a polyamide layer, the second core layer is an ethylene-vinyl alcohol co-polymer layer, the fourth core layer is a polyethylene layer, and the third and fifth layers are polyvinylidene chloride layers and both contain a mixture composed of 98 wt% of polyvinylidene chloride and 2 wt% of a processing aid, wherein the polyvinylidene chloride is a vinylidene chloride-maleic anhydride co-polymer, is 150 DEG C in melt point and is 1.7g/cm<3> in density, and the processing aid is epoxidized soybean oil. According to the invention, the original single core layer is improved and five functional core layers are composited according to the certain thickness ratio, so that the heat-sealing film is greatly improved in air barrier performance, heat-sealing performance and mechanical strength.

Description

The multi-layer co-extruded heat-sealing film of high gas-obstructing character
Technical field
The present invention relates to the multi-layer co-extruded heat-sealing film of a kind of high gas-obstructing character.
Background technology
The packaging of commodity for commodity storage, transport, guarantee the quality, beautify there is important function.Traditional manner of packing is packed in cases and enlacement packaging mainly.But along with the progress of expanding economy, science and technology, the with rapid changepl. never-ending changes and improvements of product, and the life of people is tending towards convenient and leisure more, there has also been higher requirement to the packaging of product.Based on this, along with the appearance of new material, people start to adopt polyethylene (PE) heat-sealing film to replace packed in cases and to tie up, have save material, reduce costs, protection against the tide, health, plurality of advantages easy to use, but lack excellent gas barrier property.Especially pack as the smells such as flavouring, tomato sauce, pasta, meat products, cheese product, finished fruit and vegetable, beverage, chemicals, medical product comparatively greatly, food (medicine) product that needs barrier to protect time, defect is obvious.
On the basis of polyethylene (PE) heat-sealing film, also improve out multi-layer co-extruded heat-sealing film for this reason, this film comprises top layer, hot sealing layer and sandwich layer usually, top layer is generally wearability, smoothness, material that processability is good, usual employing metallocene polyethylene material is as top layer (such as metallocene LLDPE or metallocene VLDPE), but expose following problem: add and extrude moment of torsion comparatively large and pressure man-hour and raise, output cannot improve, and also there will be melt body fragmentation affects product packaging effects, transparency and outward appearance.Hot sealing layer many employings polythene material, also includes the polyolefin based materials possessing certain bonding characteristics and heat shrinkability characteristic, such as LDPE, LLDPE, VLDPE, ULDE, SURLYN, EVA etc., guarantees tightly to stick product by after thermal softening.
Sandwich layer is the major function layer intercepting gas and smell, barrier propterty for heat-sealing film plays crucial effect, the sandwich layer of all kinds of multi-layer co-extruded heat-sealing film in the market all adopts the gas barrier material (such as PVF polyvinylidenechloride or ethylene-vinyl alcohol copolymer) of simple layer, although possess certain gas barrier function, but shortcoming is inefficiency, and expensive raw material price.Especially, when the polyvinylidene chloride of single raw material is wanted to reach good obstruct usefulness, it often needs the thickness increasing functional layer, increases production cost further undoubtedly like this; And the functional layer of gas barrier material also can affect the use of top layer and hot sealing layer raw material after occupying larger ratio, thus reduce as the heat sealability of the hot sealing layer material of (heat-sealing) shrinkage layer, shrinkage and heat seal strength, the due usefulness of reduction top layer raw material simultaneously.And single sandwich layer such as PVF polyvinylidenechloride, the impact strength of itself, paracentesis resistance, lower temperature resistance, adhesion-resistant slippery and bag, pollution resistance, optical property and transparency all poor, affect the lifting of heat-sealing film total quality.
Summary of the invention
The present invention seeks to: provide a kind of high gas-obstructing character multi-layer co-extruded heat-sealing film, be intended to effectively to solve the current coextruding heat sealer barrier properties for gases of single sandwich layer, heat sealability and the mechanical property of adopting poor, and the defect that manufacturing cost is high.
Technical scheme of the present invention is: the multi-layer co-extruded heat-sealing film of a kind of high gas-obstructing character, comprise top layer, hot sealing layer and the sandwich layer between them, it is characterized in that described sandwich layer comprise co-extrusion generate first, second, third and fourth, five sandwich layers, and between the first sandwich layer and top layer, between third and fourth sandwich layer, between fourth, fifth sandwich layer and the 5th all to bond by adhesive layer between sandwich layer and hot sealing layer; Described first, second, third and fourth, the Thickness Ratio of five sandwich layers is (1 ~ 3): (1 ~ 5): (1 ~ 4): (1 ~ 5): (1 ~ 4); Wherein the first sandwich layer is aramid layer; Second sandwich layer is evoh layer; 3rd sandwich layer is polyvinylidene chloride layer, and the 4th sandwich layer is polyethylene layer; 5th sandwich layer is also polyvinylidene chloride layer, described 3rd, five sandwich layers all comprise the mixture be made up of the polyvinylidene chloride of 98Wt% and the processing aid of 2Wt%, described polyvinylidene chloride is vinylidene chloride-maleic anhydride compound, fusing point 150 DEG C, density 1.7g/cm 3, described processing aid is epoxidized soybean oil.
Further, described in the present invention, the 4th sandwich layer comprises the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
Further, top layer described in the present invention is one or both mixtures in any proportion in polyamide, polyolefin and polyester.
Further, top layer described in the present invention comprises polyamide, polyolefin and polyester, and the weight range of polyamide is 20% ~ 40%, and polyolefinic weight range is 0% ~ 40%, and the weight range of polyester is 40% ~ 80%.
Further, polyolefin described in the present invention comprises resin a and resin b, and wherein the weight content scope of resin a is 0% ~ 60%, and the weight content scope of resin b is 40% ~ 100%; Described resin a density is 0.88 ~ 0.917g/cm 3, be the mixture of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, wherein alhpa olefin is propylene, butylene, hexene-1 or octene-1, and weight content is 1% ~ 20%; Described resin b is the copolymer of ethene and methacrylic acid, acrylic acid, vinylacetate, butyl acrylate or ethyl acrylate, and wherein the weight content of carboxylic acid monomer is 5% ~ 25%.
Further, hot sealing layer described in the present invention is polyethylene layer, comprises the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
Further, the gross thickness of the first sandwich layer described in the present invention, the second sandwich layer, the 3rd sandwich layer and the 4th sandwich layer is 15 ~ 25 microns.
Further, the thickness on top layer described in the present invention is 8 ~ 10 microns, and the thickness range of hot sealing layer is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer is 3 ~ 5 microns.
Further, adhesive layer described in the present invention comprises ethylene-vinyl acetate copolymer or maleic anhydride modified ethene polymers, when comprising ethylene-vinyl acetate copolymer, in ethylene-vinyl acetate copolymer, the weight percentage of vinylacetate is 5% ~ 25%, and density is 0.93 ~ 0.94g/cm 3.
Advantage of the present invention is:
1, technical solution of the present invention overcomes barrier properties for gases, heat sealability and mechanical strength poor performance when conventional multilayer coextruding heat sealer adopts single polyvinylidene chloride sandwich layer, the defect that cost is high; It carrys out composite polyamide, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyethylene and polyvinylidene chloride five layer function sandwich layer by certain thickness ratio, the each layer physical property characteristic of R. concomitans, greatly improves the gas barrier property of heat-sealing film, heat sealability and mechanical strength.The present invention is simultaneously under the prerequisite guaranteeing excellent gas barrier property, heat sealability and mechanical property, decrease the utilization of single polyvinylidene chloride, reduce further production cost (cost savings reach 25 ~ 30%) and market price, improve product competitiveness in the market, bring very considerable economic benefit.
2, the invention belongs to the vacuum packaging material of improvement air barrier performance, especially when applying to that the smells such as flavouring, tomato sauce, pasta, meat products, cheese product, finished fruit and vegetable, beverage, chemicals, medical product are comparatively large, food (medicine) product that needs barrier protect time produce extraordinary effect, gas barrier property lifting 25 ~ 35%; In the gas barrier experiment of meat products, cheese product, the gas permeation rate (transmission coefficient) of oxygen, water vapour declines 50 ~ 60%.
3, technical scheme of the present invention is equivalent to introduce polyamide, ethylene-vinyl alcohol copolymer and polyethylene further in the system of double-deck polyvinylidene chloride core, the impact strength of sandwich layer can be improved, paracentesis resistance, lower temperature resistance, heat sealability, heat seal strength, adhesion-resistant slippery and bag, pollution resistance, optical property and transparency, promote heat-sealing film total quality.
4, the present invention improves the skin-material of multi-layer co-extruded heat-sealing film simultaneously, eliminate the use of metallocene polyethylene material, overcome original heat-sealing film and extrude moment of torsion greatly, output is little, and easily melt body fragmentation (low temperature is crisp) affects attractive in appearance and defect that is intensity.And guarantee that top layer has special performance by the ratio of hybrid limited polyamide, polyolefin and polyester in the scheme of improvement, as the impact strength of excellence, paracentesis resistance, lower temperature resistance, low volatility, adhesion-resistant slippery and bag; Possess certain heat sealability, good pollution resistance, optical property, transparency is better, and good barrier properties for gases simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the cross section structure schematic diagram of the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present invention;
Wherein: 1, top layer; 2, the first sandwich layer; 3, the second sandwich layer; 4, the 3rd sandwich layer; 5, the 4th sandwich layer; 6, the 5th sandwich layer; 7, hot sealing layer; 8, adhesive layer.
Detailed description of the invention
As described in Figure 1, the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present invention, general introduction is in eleventh floor structure, comprise top layer 1, first sandwich layer 2, second sandwich layer 3, the 3rd sandwich layer 4, the 4th sandwich layer 5, the 5th sandwich layer 6 and hot sealing layer 7, wherein between the first sandwich layer 2 and top layer 1, between third and fourth sandwich layer 4,5, all bond by adhesive layer 8 between fourth, fifth sandwich layer 5,6 and between the 5th sandwich layer 6 and hot sealing layer 7.The thickness on described top layer 1 is 8 ~ 10 microns, and the thickness range of hot sealing layer 7 is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer 8 is 3 ~ 5 microns.And the gross thickness of the first sandwich layer 2, second sandwich layer 3, the 3rd sandwich layer 4, the 4th sandwich layer 5 and the 5th sandwich layer 6 is 15 ~ 25 microns, and the Thickness Ratio of the first sandwich layer 2, second sandwich layer 3, the 3rd sandwich layer 4, the 4th sandwich layer 5 and the 5th sandwich layer 6 is (1 ~ 3): (1 ~ 5): (1 ~ 4): (1 ~ 5): (1 ~ 4).
The first described sandwich layer 2 is aramid layer, and described second sandwich layer 3 is evoh layer; Described 3rd sandwich layer 4 is polyvinylidene chloride layer, comprises the mixture be made up of the polyvinylidene chloride of 98Wt% and the processing aid of 2Wt%, and described polyvinylidene chloride is vinylidene chloride-maleic anhydride compound, fusing point 150 DEG C, density 1.7g/cm 3, described processing aid is epoxidized soybean oil; Described 4th sandwich layer 5 is polyethylene layer, comprises the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.5th sandwich layer 6 is also polyvinylidene chloride layer, comprises the mixture be made up of the polyvinylidene chloride of 98Wt% and the processing aid of 2Wt%, and described polyvinylidene chloride is vinylidene chloride-maleic anhydride compound, fusing point 150 DEG C, density 1.7g/cm 3, described processing aid is epoxidized soybean oil.
Described top layer 1 is one or both mixtures in any proportion in polyamide, polyolefin and polyester.Or described top layer comprises polyamide, polyolefin and polyester, the weight range of polyamide is 20% ~ 40%, and polyolefinic weight range is 0% ~ 40%, and the weight range of polyester is 40% ~ 80%.Wherein said polyolefin comprises resin a and resin b, and wherein the weight content scope of resin a is 0% ~ 60%, and the weight content scope of resin b is 40% ~ 100%; Described resin a density is 0.88 ~ 0.917g/cm 3, be the mixture of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, wherein alhpa olefin is propylene, butylene, hexene-1 or octene-1, and weight content is 1% ~ 20%; Described resin b is the copolymer of ethene and methacrylic acid, acrylic acid, vinylacetate, butyl acrylate or ethyl acrylate, and wherein the weight content of carboxylic acid monomer is 5% ~ 25%.Described hot sealing layer 7 is polyethylene layer, comprises the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
Described adhesive layer 8 comprises ethylene-vinyl acetate copolymer or maleic anhydride modified ethene polymers, when comprising ethylene-vinyl acetate copolymer, in ethylene-vinyl acetate copolymer, the weight percentage of vinylacetate is 5% ~ 25%, and density is 0.93 ~ 0.94g/cm 3.
This heat-sealing film has good oxygen and water vapor barrier, high shrinkage factor, good resistance tocrocking, heat sealability and puncture resistance, be especially suitable for the fresh-keeping packaging of food (medicine) product that is as comparatively large in smells such as flavouring, tomato sauce, pasta, meat products, cheese product, finished fruit and vegetable, beverage, chemicals, medical products, that need barrier to protect.
Embodiment 1
Shown in composition graphs 1, the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present embodiment, top layer 1 thickness: 8 microns, hot sealing layer 7 thickness 19 microns, the thickness of the first sandwich layer 2, second sandwich layer 3, the 3rd sandwich layer 4, the 4th sandwich layer 5 and the 5th sandwich layer 6 is 3 microns, and adhesive layer 8 thickness is 3 microns.
Each layer raw material, top layer 1: polyamide 80kg; First sandwich layer 2: polyamide 50kg; Second sandwich layer 3: evoh layer 100kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; 4th sandwich layer 5: LLDPE 50kg, density 0.90g/cm 3, melt index is 0.35g/10min; 5th sandwich layer 6:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Hot sealing layer 7: LLDPE 50kg, density 0.90g/cm 3, melt index is 0.35g/10min; The raw material of each layer adhesive layer 8 is identical, is 5kg ethylene-vinyl acetate copolymer, density 0.93g/cm 3.
The extruder that each layer raw material adds each layer is respectively carried out fusion plastification, then enters a multi-layer co-extruded circular die and carry out the distribution of melt thus form the circular melt pipe of a multilayer; Circular melt pipe carries out entering hot water storgae after cooling forming through vacuum sizing and carries out being heated to the suitable temperature propelled the price of, and is filled with compressed air and carries out horizontal inflation and longitudinal stretching between two pairs of nip rolls; Former film after shaping carries out rolling after heat-treating, and then carries out radiation treatment and is filmed after certain dosage.
Embodiment 2
Shown in Figure 1, the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present embodiment, top layer 1 thickness: 9 microns, hot sealing layer 7 thickness 20 microns, the first sandwich layer 2 thickness is 3 microns, and the second sandwich layer 3 thickness is 5 microns, the thickness of the 3rd sandwich layer 4 is 4 microns, the thickness of the 4th sandwich layer 5 is 5 microns, and the thickness of the 5th sandwich layer 6 is 4 microns, and adhesive layer 8 thickness is 4 microns.
Each layer raw material, top layer 1: polyolefin is 100kg, specifically 60kg ethylene-alpha-olefin copolymer (alhpa olefin is propylene) altogether, and density is 0.88g/cm 3, and the ethylene-methacrylic acid copolymer of 40kg;
First sandwich layer 2: polyamide 40kg; Second sandwich layer 3: evoh layer 80kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; 4th sandwich layer 5: the mixture of ultra-low density polyethylene 35kg and linear density polyethylene 25kg, density 0.915g/cm 3, melt index is 0.55g/10min; 5th sandwich layer 6:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Hot sealing layer 7: the mixture of LLDPE 40kg and linear density polyethylene 60kg, density 0.915g/cm 3, melt index is 0.55g/10min; The raw material of each layer adhesive layer 8 is identical, is the maleic anhydride modified ethene polymers of 5kg.
Preparation method is identical with embodiment 1.
Embodiment 3
Shown in Figure 1, the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present embodiment, top layer 1 thickness: 10 microns, hot sealing layer 7 thickness 24 microns, the thickness of the first sandwich layer 2, second sandwich layer 3, the 3rd sandwich layer 4 and the 4th sandwich layer 5 is 5 microns, and adhesive layer 8 thickness is 5 microns.
Each layer raw material, top layer 1: polyamide 40kg, polyolefin 40kg, polyester 60kg (PET), wherein polyolefin specifically 10kg ethylene-alpha-olefin copolymer (alhpa olefin is hexene-1), density is 0.90g/cm 3, and the ethylene-vinyl acetate copolymer of 30kg;
First sandwich layer 2: polyamide 50kg; Second sandwich layer 3: evoh layer 100kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; 4th sandwich layer 5: linear density polyethylene 50kg, density 0.92g/cm 3, melt index is 0.70g/10min; 5th sandwich layer 6:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Hot sealing layer 7: the mixture of ultra-low density polyethylene 35kg and linear density polyethylene 25kg, density 0.915g/cm after mixing 3, melt index is 0.55g/10min; The raw material of each layer adhesive layer 8 is identical, is 20kg ethylene-vinyl acetate copolymer, density 0.94g/cm 3.
Preparation method is identical with embodiment 1.
Embodiment 4
Shown in Figure 1, the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present embodiment, top layer 1 thickness: 9 microns, hot sealing layer 7 thickness 22 microns, the thickness of the first sandwich layer 2 is 3 microns, and the thickness of the second sandwich layer 3 is 6 microns, the thickness of the 3rd sandwich layer 4 is 4.5 microns, the thickness of the 4th sandwich layer 5 is 6 microns, and the thickness of the 5th sandwich layer 6 is 4.5 microns, and adhesive layer 8 thickness is 4 microns.
Each layer raw material, top layer 1: polyamide 6 0kg and polyester 40kg (PET);
First sandwich layer 2: polyamide 40kg; Second sandwich layer 3: evoh layer 80kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; 4th sandwich layer 5: the mixture of ultra-low density polyethylene 55kg and linear density polyethylene 35kg, density 0.91g/cm after mixing 3, melt index is 0.60g/10min; 5th sandwich layer 6:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Hot sealing layer 7: LLDPE 50kg, density 0.90g/cm 3, melt index is 0.35g/10min; The raw material of each layer adhesive layer 8 is identical, is 5kg ethylene-vinyl acetate copolymer, density 0.93g/cm 3.
Preparation method is identical with embodiment 1.
Embodiment 5
Shown in Figure 1, the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present embodiment, top layer 1 thickness: 10 microns, hot sealing layer 7 thickness 24 microns, the thickness of the first sandwich layer 2 is 3.5 microns, and the thickness of the second sandwich layer 3 is 4.5 microns, the thickness of the 3rd sandwich layer 4 is 4.5 microns, the thickness of the 4th sandwich layer 5 is 4.5 microns, and the thickness of the 5th sandwich layer 6 is 4.5 microns, and adhesive layer 8 thickness is 5 microns.
Each layer raw material, top layer 1: polyamide 20kg, polyolefin 40kg, polyester 80kg (PET), wherein polyolefin specifically 15kg ethylene-alpha-olefin copolymer (alhpa olefin is butylene, and density is 0.90g/cm 3, and the ethylene-butyl acrylate copolymer of 25kg;
First sandwich layer 2: polyamide 50kg; Second sandwich layer 3: evoh layer 100kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; 4th sandwich layer 5: LLDPE 50kg, density 0.90g/cm 3, melt index is 0.35g/10min; 5th sandwich layer 6:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Hot sealing layer 7: linear density polyethylene 50kg, density 0.92g/cm 3, melt index is 0.70g/10min; The raw material of each layer adhesive layer 8 is identical, is the maleic anhydride modified ethene polymers of 5kg.
Preparation method is identical with embodiment 1.
After testing, the barrier properties for gases laboratory test results of the conventional multilayer coextruding heat sealer (single sandwich layer polyvinylidene chloride) of above-mentioned 5 embodiments and current commercial type sees the following form:
After testing, every physical parameter of the conventional multilayer coextruding heat sealer (single sandwich layer polyvinylidene chloride) of above-mentioned 5 embodiments and current commercial type detects and sees the following form:
Except above-mentioned experiment, the multi-layer co-extruded heat-sealing film of high gas-obstructing character of the present invention, it is in lower temperature resistance, volatility, and adhesion-resistant slippery, bag and pollution resistance aspect are also all better than current like product on the market.
Below be only embody rule example of the present invention, protection scope of the present invention is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within the claims in the present invention protection domain.

Claims (9)

1. the multi-layer co-extruded heat-sealing film of high gas-obstructing character, comprise top layer (1), hot sealing layer (7) and the sandwich layer between them, it is characterized in that described sandwich layer comprise co-extrusion generate first, second, third and fourth, five sandwich layers (2,3,4,5,6), and between the first sandwich layer (2) and top layer (1), between third and fourth sandwich layer (4,5), all bond by adhesive layer (8) between fourth, fifth sandwich layer (5,6) and between the 5th sandwich layer (6) and hot sealing layer (7); Described first, second, third and fourth, the Thickness Ratio of five sandwich layers (2,3,4,5,6) is (1 ~ 3): (1 ~ 5): (1 ~ 4): (1 ~ 5): (1 ~ 4); Wherein the first sandwich layer (2) is aramid layer; Second sandwich layer (3) is evoh layer; 3rd sandwich layer (4) is polyvinylidene chloride layer, and the 4th sandwich layer (5) is polyethylene layer; 5th sandwich layer (6) is also polyvinylidene chloride layer, described 3rd, five sandwich layers (4,6) all comprise the mixture be made up of the polyvinylidene chloride of 98Wt% and the processing aid of 2Wt%, described polyvinylidene chloride is vinylidene chloride-maleic anhydride compound, fusing point 150 DEG C, density 1.7g/cm 3, described processing aid is epoxidized soybean oil.
2. the multi-layer co-extruded heat-sealing film of high gas-obstructing character according to claim 1, it is characterized in that described 4th sandwich layer (5) comprises the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
3. the multi-layer co-extruded heat-sealing film of high gas-obstructing character according to claim 1, is characterized in that described top layer (1) is polyamide, one or both mixtures in any proportion in polyolefin and polyester.
4. the multi-layer co-extruded heat-sealing film of high gas-obstructing character according to claim 1, it is characterized in that described top layer (1) comprises polyamide, polyolefin and polyester, the weight range of polyamide is 20% ~ 40%, polyolefinic weight range is 0% ~ 40%, and the weight range of polyester is 40% ~ 80%.
5. the multi-layer co-extruded heat-sealing film of the high gas-obstructing character according to claim 3 or 4, is characterized in that; Described polyolefin comprises resin a and resin b, and wherein the weight content scope of resin a is 0% ~ 60%, and the weight content scope of resin b is 40% ~ 100%; Described resin a density is 0.88 ~ 0.917g/cm 3, be the mixture of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, wherein alhpa olefin is propylene, butylene, hexene-1 or octene-1, and weight content is 1% ~ 20%; Described resin b is the copolymer of ethene and methacrylic acid, acrylic acid, vinylacetate, butyl acrylate or ethyl acrylate, and wherein the weight content of carboxylic acid monomer is 5% ~ 25%.
6. the multi-layer co-extruded heat-sealing film of high gas-obstructing character according to claim 1, it is characterized in that described hot sealing layer (7) is polyethylene layer, comprise the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
7. the multi-layer co-extruded heat-sealing film of high gas-obstructing character according to claim 1, it is characterized in that described first sandwich layer (2), the second sandwich layer (3), the 3rd sandwich layer (4), the 4th sandwich layer (5) and the 5th sandwich layer (6) gross thickness be 15 ~ 25 microns.
8. the multi-layer co-extruded heat-sealing film of the high gas-obstructing character according to claim 1 or 7, it is characterized in that the thickness on described top layer (1) is 8 ~ 10 microns, the thickness range of hot sealing layer (6) is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer (8) is 3 ~ 5 microns.
9. the multi-layer co-extruded heat-sealing film of high gas-obstructing character according to claim 1, it is characterized in that described adhesive layer (8) comprises ethylene-vinyl acetate copolymer or maleic anhydride modified ethene polymers, when comprising ethylene-vinyl acetate copolymer, in ethylene-vinyl acetate copolymer, the weight percentage of vinylacetate is 5% ~ 25%, and density is 0.93 ~ 0.94g/cm 3.
CN201510266626.1A 2015-05-22 2015-05-22 High-air-barrier-property multilayer-co-extrusion heat-sealing film Pending CN105034505A (en)

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Application publication date: 20151111