CN112848580B - PETG/PET co-extrusion self-sealing multilayer film and preparation method thereof - Google Patents

PETG/PET co-extrusion self-sealing multilayer film and preparation method thereof Download PDF

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CN112848580B
CN112848580B CN202110152843.3A CN202110152843A CN112848580B CN 112848580 B CN112848580 B CN 112848580B CN 202110152843 A CN202110152843 A CN 202110152843A CN 112848580 B CN112848580 B CN 112848580B
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petg
pet
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multilayer film
sealing
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CN112848580A (en
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李沅鸿
张启纲
李国庆
王威威
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Henan Yinjinda New Materials Co ltd
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Henan Yinjinda New Materials Co ltd
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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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
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    • B65D65/40—Applications of laminates for particular packaging purposes
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2250/05—5 or more layers
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
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    • 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
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    • 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
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    • 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
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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Abstract

The invention belongs to the field of heat-sealing film preparation, and particularly relates to a PETG/PET co-extrusion heat-sealing multilayer film and a preparation method thereof. The PETG/PET coextrusion self-sealing multilayer film provided by the invention comprises five film layers, wherein the five film layers sequentially comprise a base layer 1, an adhesive layer 1, a barrier layer, an adhesive layer 2 and a base layer 2; wherein, the base layer 1 is a heat sealing layer and comprises metallocene PE and PETG; the base layer 2 is a lower surface layer and comprises PET, an anti-blocking agent and a slipping agent; the adhesive layer 1 and the adhesive layer 2 have the same components and comprise maleic anhydride grafted polypropylene, PETG and nano carbon fiber; the barrier layer is an intermediate layer and comprises PA and PETG; the film has high heat sealing strength, moderate heat sealing temperature, improved toughness, elongation at break, interlayer peeling strength and other performances, and can be applied to the field of food packaging and the like.

Description

PETG/PET co-extrusion self-sealing multilayer film and preparation method thereof
Technical Field
The invention belongs to the field of heat-sealing film preparation, and particularly relates to a PETG/PET co-extrusion heat-sealing multilayer film and a preparation method thereof.
Background
Polyethylene terephthalate (PET) is a common thermoplastic resin, is a milky or pale yellow highly crystalline polymer, has a smooth and glossy surface, has a density of 1.30-1.38 g/cm, a melting point of 255-260 ℃, is difficult to burn, has a fire point of 480 ℃ and a cracking temperature of 420 ℃. The PET has good mechanical properties and optical properties, high tensile strength, good rigidity, stretching and bending resistance, high dimensional stability, high glossiness and high transparency, and has good barrier property to gas (oxygen and carbon dioxide) and water vapor, and is commonly used for packaging foods, distilled alcohol, carbonated beverages, non-carbonated beverages, cosmetics and the like. However, PET has a narrow processable range, high water absorption, low intrinsic viscosity after moisture absorption, silver spots and bubbles on the surface of the formed film, and low dielectric constant and poor conductivity.
PETG is polyethylene terephthalate-1, 4-cyclohexanedimethanol ester, and is a novel copolyester formed by copolymerizing three monomers of terephthalic acid (PTA) or dimethyl terephthalate (DMT), ethylene Glycol (EG) and 1, 4-Cyclohexanedimethanol (CHDM). Compared with the traditional PET, a part of glycol EG in the synthesis process of the novel copolyester PETG is replaced by CHDM, and the copolyester is PETG when the CHDM content is less than 50% of the total amount of glycol. Because the extremely low crystallinity of PETG even does not crystallize, the transparency of the PETG is extremely high, the toughness of the PETG is extremely excellent, and the elongation at break of the PETG product in the Izeman industrialization of the United states can reach about 300 percent, which is far higher than PET. The chemical resistance of PETG is also very good, and the PETG has the properties of resisting dilute acid and alkali corrosion. Meanwhile, PETG is resistant to gamma-ray irradiation, does not change color after gamma-ray irradiation, and still can keep higher transparency and stability. The PETG film has higher barrier property to gas (oxygen and carbon dioxide), and is suitable for packaging products with higher requirements on gas barrier property. The PETG is mainly applied to the film aspect to prepare a high-shrinkage film, the shrinkage rate of common PET is about 30 percent, and the shrinkage rate of the PETG film can reach 70 percent, so that the PETG film has the advantages of high plastic uptake, high transparency, high gloss, low haze, easiness in printing, difficulty in falling off and low natural shrinkage rate during storage. The biaxially oriented PETG film is suitable for high-grade packaging, printing, electronic and electric appliances, cable wrapping, insulating materials and high-quality base materials in various industrial fields. The unidirectional stretching PET heat-shrinkable film is suitable for various external labels such as canning, polyester bottles, various containers and the like.
The multilayer coextrusion composite film is a novel packaging material, can make up the performance defect of a single-layer plastic film, exerts the advantages of each layer of material, achieves the purpose of making up for the advantages of the other layers, has better comprehensive performance and outstanding certain packaging characteristics, and is one of the most ideal film materials which meet the special requirements of packaging contents at present. At present, there is little research on the co-extrusion of PET and PETG to produce high performance heat seal films.
Disclosure of Invention
To overcome the shortcomings and drawbacks of the prior art, a primary object of the present invention is to provide a PETG/PET co-extruded heat seal multilayer film.
The invention also aims to provide a preparation method of the PETG/PET coextrusion self-sealing multilayer film.
It is a further object of the present invention to provide the use of the above PETG/PET coextruded heat seal multilayer film.
The aim of the invention is achieved by the following technical scheme:
the PETG/PET coextrusion self-sealing multilayer film comprises five film layers, wherein the five film layers sequentially comprise a base layer 1, an adhesive layer 1, a barrier layer, an adhesive layer 2 and a base layer 2; wherein, the base layer 1 is a heat sealing layer and comprises metallocene PE and PETG; the base layer 2 is a lower surface layer and comprises PET, an anti-blocking agent and a slipping agent; the adhesive layer 1 and the adhesive layer 2 have the same components and comprise maleic anhydride grafted polypropylene, PETG and nano carbon fiber; the barrier layer is an intermediate layer and comprises PA and PETG;
the base layer 1 comprises the following components in percentage by mass: 10-20% of metallocene PE and 80-90% of PETG;
the base layer 2 comprises the following components in percentage by mass: 96-100% of PET, 0-2% of anti-blocking agent and 0-2% of slipping agent;
the bonding layer 1 and the bonding layer 2 comprise the following components in percentage by mass: 60-70% of maleic anhydride grafted polypropylene, 25-30% of PETG and 5-10% of carbon nanofiber;
the barrier layer comprises the following components in percentage by mass: 80-90% of PA and 10-20% of PETG;
the melt index of the metallocene PE is preferably 0.5-2 g/10min;
the PETG is preferably SKYGREEN S2008, izeman GN071 or Izeman 0603;
the PA is preferably at least one of MXD6 and Grivory G21;
the melt index of the maleic anhydride grafted polypropylene is preferably 4-8 g/10min;
the anti-blocking agent is preferably at least one of silicon dioxide, talcum powder, clay, kaolin and the like;
the slipping agent is preferably at least one of oleamide and erucamide;
the preparation method of the PETG/PET coextrusion self-sealing multilayer film comprises the following steps:
(1) Respectively mixing raw materials of each layer of PETG/PET co-extrusion self-sealing multilayer film, and then carrying out melt plasticization in different extruders;
(2) Extruding and converging the molten metal into the same die head according to a set structural level, and flowing out the molten metal from the die head; then cooling and forming through a casting roll to form a casting;
(3) The cast sheet is longitudinally stretched, transversely stretched and rolled to obtain a PETG/PET co-extrusion heat seal multilayer film;
the temperature of the die head in the step (2) is preferably 285-290 ℃;
the conditions of the longitudinal stretching in the step (3) are as follows:
after preheating, the stretching temperature is 80-100 ℃, the stretching multiplying power is 3-4 times, and after longitudinal stretching, cooling and shaping are carried out;
the temperature of the transverse stretching in step (3) is preferably:
preheating, stretching at 90-110 ℃, stretching with a stretching ratio of 3-4 times, transversely stretching, and cooling and shaping;
the PETG/PET coextrusion self-sealing multilayer film is prepared by the preparation method;
the thickness of the PETG/PET coextrusion self-sealing multilayer film is preferably 30-100 mu m;
the PETG/PET coextrusion self-sealing multilayer film is applied to the packaging field;
compared with the prior art, the invention has the following advantages and effects:
(1) The PETG/PET co-extrusion self-sealing multilayer film provided by the invention takes metallocene PE and PETG as a heat sealing layer, wherein the PETG has better heat sealing performance but lower mechanical strength, and the invention takes the metallocene PE and PETG as the heat sealing layer, so that the problems of poor mechanical performance and the like of the PETG can be solved, and meanwhile, the heat sealing strength is also improved;
(2) In the process of preparing the multilayer film, the field generally increases the adhesion between the functional layer and the base layer by adding an adhesive layer to ensure the interlayer peeling force, and the adhesive layer is generally selected from graft modified polymers. In order to improve the peeling strength of the bonding layer, the functional layer and the base layer, more nano carbon fibers are added in the bonding layer, when the layers are extruded and converged and the melting temperature is higher, the solution fluidity is good, the nano carbon fibers on the surface of the bonding layer are embedded into the base layer and the functional layer in a bidirectional root taking mode, so that the peeling strength among all layers is greatly improved due to the connection of the nano carbon fibers, the interlayer sliding and peeling are avoided, and meanwhile, the toughness of the film is also greatly improved by the nano carbon fibers;
(3) According to the invention, PA and PETG are selected as functional layers (barrier layers) (shown in figure 1), on one hand, the thermal performance of PA is close to that of PETG, the compatibility of PA and PETG is good, and the PA and PETG are extruded by melting without adding a compatilizer; on the other hand, the composite of the two has better barrier property to oxygen and carbon dioxide and also has better barrier property to water vapor;
(4) The PETG/PET co-extrusion self-sealing multilayer film provided by the invention has the advantages of high heat sealing strength, moderate heat sealing temperature, and improved toughness, elongation at break, interlayer peeling strength and other performances.
Drawings
FIG. 1 is a schematic diagram of the PETG/PET coextruded heat seal multilayer film provided by the invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
(1) PET (FG 620, mesopetrochemical), PETG (SKYGREEN) S2008, PA (MXD 6) and the like are dried and dehumidified before melt extrusion for use:
(2) Respectively mixing the raw materials of each layer of the PETG/PET co-extrusion self-sealing multilayer film according to the proportion, and then feeding the mixture into different extruders for melt plasticization, wherein:
the base layer 1 is prepared from the following raw materials in percentage by mass: 16% metallocene PE (5100G, dow) and 84% PETG (SKYGREEN profile S2008);
the base layer 2 is prepared from the following raw materials in percentage by mass: 99.89% PET (FG 620, mesopetrochemical instrumentation), 0.1% anti-blocking agent silica flour, and 0.01% slip agent crodamide ER;
the adhesive layer 1 and the adhesive layer 2 are prepared from the following raw materials in percentage by mass: 68% maleic anhydride grafted polypropylene (ADMER SE 800), 25% PETG (SKYGREEN S2008) and 7% carbon nanofiber;
the barrier layer is prepared from the following raw materials in percentage by mass: 85% PA (MXD 6) and 15% PETG (SKYGREEN [ S2008);
(3) Extruding and converging the fused mass after the fusion and plasticization on the same die head according to a set structural level, and flowing out the fused mass from the die head, wherein the temperature of the die head is 285 ℃; then cooling and forming the cast sheet by a cast sheet roller to form a cast sheet for standby;
(4) Preheating the cast sheet in a longitudinal stretching device, and then carrying out longitudinal stretching at a stretching temperature of 90 ℃, wherein the stretching multiplying power is 3.0 times, and cooling and shaping after longitudinal stretching;
(5) Preheating the cast sheet after longitudinal stretching in a transverse stretching device, and then transversely stretching at the stretching temperature of 100 ℃, wherein the stretching multiplying power is 3.5 times, and cooling and shaping after transverse stretching;
(6) And after transverse stretching, rolling to obtain the PETG/PET coextrusion self-sealing multilayer film, wherein the thickness ratio of the base layer 1, the bonding layers 1 and 2, the barrier layer and the base layer 2 is 36:40:8:16.
example 2
(1) PET (FG 620, mesopetrochemical), PETG (SKYGREEN) S2008, PA (MXD 6) and the like are dried and dehumidified before melt extrusion for use:
(2) Respectively mixing the raw materials of each layer of the PETG/PET co-extrusion self-sealing multilayer film according to the proportion, and then feeding the mixture into different extruders for melt plasticization, wherein:
the base layer 1 is prepared from the following raw materials in percentage by mass: 10% metallocene PE (5100G, dow) and 90% PETG (SKYGREEN profile S2008);
the base layer 2 is prepared from the following raw materials in percentage by mass: 99.85% PET (FG 620, mesopetrochemical instrumentation), 0.1% anti-blocking agent silica flour, and 0.05% slip agent crodamide ER;
the adhesive layer 1 and the adhesive layer 2 are prepared from the following raw materials in percentage by mass: 60% maleic anhydride grafted polypropylene (ADMER SE 800), 30% PETG (SKYGREEN S2008) and 10% carbon nanofiber;
the barrier layer is prepared from the following raw materials in percentage by mass: 80% PA (MXD 6) and 20% PETG (SKYGREEN [ S2008);
(3) Extruding and converging the fused mass after the fusion and plasticization on the same die head according to a set structural level, and flowing out the fused mass from the die head, wherein the temperature of the die head is 285 ℃; then cooling and forming the cast sheet by a cast sheet roller to form a cast sheet for standby;
(4) Preheating the cast sheet in a longitudinal stretching device, and then carrying out longitudinal stretching at a stretching temperature of 100 ℃, wherein the stretching multiplying power is 3.5 times, and cooling and shaping after longitudinal stretching;
(5) Preheating the cast sheet subjected to longitudinal stretching in a transverse stretching device, and then transversely stretching at a stretching temperature of 110 ℃, wherein the stretching multiplying power is 4 times, and cooling and shaping after transverse stretching;
(6) And after transverse stretching, rolling to obtain the PETG/PET coextrusion self-sealing multilayer film, wherein the thickness ratio of the base layer 1, the bonding layers 1 and 2 and the barrier layer to the base layer 2 is 30:45:8:17.
example 3
(1) PET (FG 620, mesopetrochemical), PETG (SKYGREEN) S2008, PA (MXD 6) and the like are dried and dehumidified before melt extrusion for use:
(2) Respectively mixing the raw materials of each layer of the PETG/PET co-extrusion self-sealing multilayer film according to the proportion, and then feeding the mixture into different extruders for melt plasticization, wherein:
the base layer 1 is prepared from the following raw materials in percentage by mass: 20% metallocene PE (5100G, dow) and 80% PETG (SKYGREEN profile S2008);
the base layer 2 is prepared from the following raw materials in percentage by mass: 99.75% PET (FG 620, medium petrochemical instrumentation), 0.2% anti-blocking agent silica flour, and 0.05% slip agent crodamide ER;
the adhesive layer 1 and the adhesive layer 2 are prepared from the following raw materials in percentage by mass: 70% of maleic anhydride grafted polypropylene (ADMER SE 800), 25% of PETG (SKYGREEN S2008) and 5% of carbon nanofiber;
the barrier layer is prepared from the following raw materials in percentage by mass: 90% PA (MXD 6) and 10% PETG (SKYGREEN S2008);
(3) Extruding and converging the fused mass after the fusion and plasticization on the same die head according to a set structural level, and flowing out the fused mass from the die head, wherein the temperature of the die head is 290 ℃; then cooling and forming the cast sheet by a cast sheet roller to form a cast sheet for standby;
(4) Preheating the cast sheet in a longitudinal stretching device, and then carrying out longitudinal stretching at a stretching temperature of 100 ℃, wherein the stretching multiplying power is 3.0 times, and cooling and shaping after longitudinal stretching;
(5) Preheating the cast sheet subjected to longitudinal stretching in a transverse stretching device, and then transversely stretching at a stretching temperature of 110 ℃, wherein the stretching multiplying power is 4 times, and cooling and shaping after transverse stretching;
(6) And after transverse stretching, rolling to obtain the PETG/PET coextrusion self-sealing multilayer film, wherein the thickness ratio of the base layer 1, the bonding layers 1 and 2, the barrier layer and the base layer 2 is 35:40:10:15.
comparative example 1
In this example, the base layer 1 was prepared from PETG (SKYGREEN cube S2008), and the other layers were prepared in the same manner as in example 1.
Comparative example 2
The adhesive layer 1 and the adhesive layer 2 in this example are prepared from the following raw materials in mass percent: 75% maleic anhydride grafted polypropylene (ADMER SE 800) and 25% PETG (SKYGREEN cube S2008); other layers were prepared in the same manner as in example 1, except that the composition of the other layers was the same as in example 1.
Comparative example 3
In this example, the barrier layer was prepared from only PA (MXD 6) and the other layers were prepared in the same manner as in example 1.
The coextruded heat-seal multilayer films produced in examples 1 to 3 and comparative examples 1 to 3 were examined for thickness, tensile strength, heat-seal temperature, heat-seal strength, elongation at break, water vapor transmission amount, oxygen transmission amount, etc., respectively. Wherein, the tensile strength and elongation at break are carried out according to the GB/T1040.3 method, the heat sealing performance is carried out according to the BMSTT01 method, and the oxygen permeability and the like are carried out according to ASRM related methods. The results are shown in Table 1.
TABLE 1 Properties of different Co-extruded heat seal multilayer films
Figure DEST_PATH_IMAGE002
As can be seen from table 1, when PETG (comparative example 1) was used for the heat-seal layer completely, the heat-seal temperature of the film was higher than that of example 1, and the heat-seal strength was lower than that of example 1, and furthermore, the tensile strength and elongation at break of the film were lower than those of example 1, and the permeation amount of water vapor and oxygen was slightly higher than that of example 1.
When the carbon nanofibers were not included in the adhesive layer (comparative example 2), the heat sealing properties of the film were not greatly affected, and the tensile strength and elongation at break of the film were much lower than those of example 1.
When the barrier layer does not contain PETG (comparative example 3), there is no great influence on heat sealing properties, tensile strength, etc. of the film, but the permeation amount of water vapor and oxygen of the film is seriously affected.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (8)

1. The PETG/PET coextrusion self-sealing multilayer film comprises five film layers and is characterized by sequentially comprising a base layer 1, an adhesive layer 1, a barrier layer, an adhesive layer 2 and a base layer 2; wherein, the base layer 1 is a heat sealing layer and comprises metallocene PE and PETG; the base layer 2 is a lower surface layer and comprises PET, an anti-blocking agent and a slipping agent; the adhesive layer 1 and the adhesive layer 2 have the same components and comprise maleic anhydride grafted polypropylene, PETG and nano carbon fiber; the barrier layer is an intermediate layer and comprises PA and PETG;
the base layer 1 comprises the following components in percentage by mass: 10-20% of metallocene PE and 80-90% of PETG;
the base layer 2 comprises the following components in percentage by mass: 96-100% of PET, 0-2% of anti-blocking agent and 0-2% of slipping agent;
the bonding layer 1 and the bonding layer 2 comprise the following components in percentage by mass: 60-70% of maleic anhydride grafted polypropylene, 25-30% of PETG and 5-10% of carbon nanofiber;
the barrier layer comprises the following components in percentage by mass: 80-90% of PA and 10-20% of PETG;
the preparation method of the PETG/PET coextrusion self-sealing multilayer film comprises the following steps:
(1) Respectively mixing raw materials of each layer of PETG/PET co-extrusion self-sealing multilayer film, and then carrying out melt plasticization in different extruders;
(2) Extruding and converging the molten metal into the same die head according to a set structural level, and flowing out the molten metal from the die head; then cooling and forming through a casting roll to form a casting; in the step (2), the temperature of the die head is 285-290 ℃;
(3) And (3) carrying out longitudinal stretching, transverse stretching and rolling on the cast sheet to obtain the PETG/PET co-extrusion heat-seal multilayer film.
2. The PETG/PET coextruded heat seal multilayer film of claim 1, wherein:
the melt index of the metallocene PE is 0.5-2 g/10min.
3. The PETG/PET coextruded heat seal multilayer film of claim 1, wherein:
the PETG is SKYGREEN cube S2008 Isman GN071 or Isman 0603.
4. The PETG/PET coextruded heat seal multilayer film of claim 1, wherein:
the PA is at least one of MXD6 and Grivory G21.
5. The PETG/PET coextruded heat seal multilayer film of claim 1, wherein:
the melt index of the maleic anhydride grafted polypropylene is 4-8 g/10min.
6. The PETG/PET coextruded heat seal multilayer film of claim 1, wherein:
the anti-blocking agent is at least one of silicon dioxide, talcum powder, clay and kaolin.
7. The PETG/PET coextruded heat seal multilayer film of claim 1, wherein:
the slipping agent is at least one of oleamide and erucamide.
8. Use of the PETG/PET coextruded heat seal multilayer film of any of claims 1-7 in packaging applications.
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