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CN112848580A - PETG/PET co-extrusion self-heat-sealing multilayer film and preparation method thereof - Google Patents

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

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Publication number
CN112848580A
CN112848580A CN202110152843.3A CN202110152843A CN112848580A CN 112848580 A CN112848580 A CN 112848580A CN 202110152843 A CN202110152843 A CN 202110152843A CN 112848580 A CN112848580 A CN 112848580A
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petg
pet
layer
heat
multilayer film
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CN112848580B (en
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张启纲
李沅鸿
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
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    • 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
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/32—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
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    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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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
    • 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
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    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
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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
    • 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
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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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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • 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
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
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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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    • C08J2467/00—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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    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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  • Polymers & Plastics (AREA)
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  • Extrusion Moulding Of Plastics Or The Like (AREA)
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Abstract

The invention belongs to the field of preparation of heat-seal films, and particularly relates to a PETG/PET co-extrusion self-heat-seal multilayer film and a preparation method thereof. The PETG/PET co-extrusion self-heat-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-adhesion 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 carbon nanofibers; the barrier layer is a middle layer and comprises PA and PETG; the film has high heat-sealing strength, moderate heat-sealing temperature, improved toughness, elongation at break, interlaminar peeling strength and other properties, and can be applied to the field of food packaging and the like.

Description

PETG/PET co-extrusion self-heat-sealing multilayer film and preparation method thereof
Technical Field
The invention belongs to the field of preparation of heat-seal films, and particularly relates to a PETG/PET co-extrusion self-heat-seal multilayer film and a preparation method thereof.
Background
Polyethylene terephthalate (PET) is a common thermoplastic resin, is a milky white or light yellow highly crystalline polymer, has smooth and glossy surface, has a density of 1.30-1.38 g/cm for carrying out thin film growing, and has a melting point of 255-260 ℃, flame retardancy, an ignition point of 480 ℃ and a cracking temperature of 420 ℃. PET has good mechanical properties and optical properties, high tensile strength, good rigidity, stretch-bending resistance, high dimensional stability, high gloss and transparency, and good barrier properties against gases (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, the PET has a narrow processing range, the PET has a large water absorption rate, the intrinsic viscosity is reduced after moisture absorption, silver spots and bubbles appear on the surface of a formed film, and the PET has a low dielectric constant and poor conductivity.
PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol terephthalate) is a novel copolyester formed by copolymerizing terephthalic acid (PTA) or dimethyl terephthalate (DMT), Ethylene Glycol (EG) and 1, 4-Cyclohexanedimethanol (CHDM). Compared with the traditional PET, the dihydric alcohol EG in the synthesis process of the novel copolyester PETG is partially replaced by CHDM, and the copolyester PETG is used when the CHDM content is less than 50 percent of the total content of the dihydric alcohol. Because of the extremely low crystallinity of PETG even no crystallization, the transparency of PETG is extremely high, the toughness of PETG is also extremely excellent, and the elongation at break of American Istman industrialization PETG products can reach about 300 percent, which is far higher than that of PET. PETG also has good chemical resistance and has the performance of resisting diluted acid and alkali corrosion. Meanwhile, PETG resists gamma ray irradiation, does not change color after gamma ray irradiation, and still can keep higher transparency and stability. The PETG film also 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 used for preparing a high-shrinkage film in the aspect of films, the shrinkage rate of common PET is about 30%, and the shrinkage rate of the PETG film can reach 70%, so that the PETG film has the advantages of high plastic uptake, high transparency, high gloss, low haze, easiness in printing, difficulty in falling and low natural shrinkage rate during storage. The bi-directional stretching 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 cans, polyester bottles, various containers and the like.
The multilayer coextruded composite film is a novel packaging material, can make up for the performance defects of a single-layer plastic film, exerts the advantages of each layer of material, achieves the purpose of making up for the deficiencies of the materials, has better comprehensive performance and some outstanding packaging characteristics, and is one of the most ideal film materials which meet the special requirements of the packaging contents at present. At present, the research on co-extruding PET and PETG to prepare the high-performance heat-sealing film is not many.
Disclosure of Invention
To overcome the disadvantages and drawbacks of the prior art, it is a primary object of the present invention to provide a PETG/PET coextruded self-sealing multilayer film.
The invention also aims to provide a preparation method of the PETG/PET co-extrusion self-heat-sealing multilayer film.
The invention further aims to provide application of the PETG/PET co-extrusion self-heat-sealing multilayer film.
The purpose of the invention is realized by the following technical scheme:
the PETG/PET co-extrusion self-heat-sealing multilayer film comprises five film layers, and sequentially comprises 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-adhesion 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 carbon nanofibers; the barrier layer is a middle 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 an anti-blocking agent and 0-2% of a slipping agent;
the adhesive layer 1 and the adhesive 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 nanofibers;
the barrier layer comprises the following components in percentage by mass: 80-90% of PA and 10-20% of PETG;
the preferable melt index of the metallocene PE is 0.5-2 g/10 min;
the PETG is preferably SKYGREEN S2008, Istmann GN071 or Istmann 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/10 min;
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 co-extrusion self-heat-sealing multilayer film comprises the following steps:
(1) respectively mixing raw materials of each layer of the PETG/PET co-extrusion self-heat-sealing multilayer film, and then carrying out melting plasticization in different extruders;
(2) extruding and converging the mixture in the same die head according to the set structural level, and enabling the melt to flow out of the die head; then cooling and forming by a casting sheet roller to form a casting sheet;
(3) longitudinally stretching, transversely stretching and rolling the cast sheet to obtain a PETG/PET co-extrusion self-heat sealing 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 magnification is 3-4 times, and the product is longitudinally stretched and then cooled for shaping;
the temperature of the transverse stretching in the step (3) is preferably:
after preheating, the stretching temperature is 90-110 ℃, the stretching magnification is 3-4 times, and cooling and shaping are carried out after transverse stretching;
the PETG/PET co-extrusion self-heat-sealing multilayer film is prepared by the preparation method;
the thickness of the PETG/PET co-extrusion self-heat-sealing multilayer film is preferably 30-100 mu m;
the PETG/PET co-extrusion self-heat-sealing multilayer film is applied to the field of packaging;
compared with the prior art, the invention has the following advantages and effects:
(1) the PETG/PET co-extrusion self-heat-sealing multilayer film provided by the invention takes the metallocene PE and the PETG as heat-sealing layers, wherein the PETG has better heat-sealing performance but lower mechanical strength;
(2) in the preparation of multilayer films, the adhesion between the functional layer and the base layer is generally increased 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 adhesive layer, the functional layer and the base layer, more carbon nanofibers are added into the adhesive layer, the melt flowability is good when the adhesive layer is extruded and converged at each level and the melting temperature is high, and the carbon nanofibers on the surface of the adhesive layer are embedded into the base layer and the functional layer in a bidirectional root-pricking mode, so that the peeling strength among layers is greatly improved due to the connection of the carbon nanofibers, the interlayer sliding and peeling are avoided, and meanwhile, the carbon nanofibers also greatly improve the toughness of the film;
(3) the invention selects PA and PETG as functional layers (barrier layers) (figure 1), on one hand, the thermal property of PA is close to that of PETG, the compatibility of PA and PETG is good, the PA and PETG are melted and extruded, and no compatilizer is required to be added; on the other hand, the composition of the two components not only has better barrier property to oxygen and carbon dioxide, but also has better barrier property to water vapor;
(4) the PETG/PET co-extrusion self-heat-sealing multilayer film provided by the invention has the advantages of high heat-sealing strength, moderate heat-sealing temperature, improved toughness, elongation at break, interlayer peeling strength and the like.
Drawings
FIG. 1 is a schematic structural view of a PETG/PET coextruded self-sealing multilayer film provided by the invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
(1) PET (FG 620, medium petrochemical characterized chemical fiber), PETG (SKYGREEN S2008), PA (MXD 6) and the like are subjected to drying and dehumidifying treatment before being subjected to melt extrusion for later use:
(2) respectively mixing raw materials of each layer of the PETG/PET co-extrusion self-heat-sealing multilayer film according to the proportion, and then sending the mixture into different extruders for melting and plasticizing, 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 S2008);
the base layer 2 is prepared from the following raw materials in percentage by mass: 99.89% PET (FG 620, medium petrochemical characterized chemical fiber), 0.1% silica powder as an antiblocking agent, and 0.01% crodamide ER as a slip agent;
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 nanofibers;
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 melt after the melting and plasticizing on the same die head according to a set structural level, and enabling the melt to flow out of the die head, wherein the temperature of the die head is 285 ℃; then cooling and forming by a casting sheet roller to form a casting sheet for later use;
(4) preheating the cast sheet in a longitudinal stretching device, and then longitudinally stretching at the stretching temperature of 90 ℃, wherein the stretching ratio is 3.0 times, and cooling and shaping after longitudinal stretching;
(5) preheating the longitudinally stretched cast sheet in a transverse stretching device, then transversely stretching at the stretching temperature of 100 ℃, wherein the stretching magnification is 3.5 times, and cooling and shaping after transverse stretching;
(6) after transverse stretching, rolling to obtain a PETG/PET co-extrusion self-heat-sealing multilayer film, wherein the thickness ratio of the base layer 1, the adhesive layers 1 and 2, the barrier layer and the base layer 2 is 36: 40: 8: 16.
example 2
(1) PET (FG 620, medium petrochemical characterized chemical fiber), PETG (SKYGREEN S2008), PA (MXD 6) and the like are subjected to drying and dehumidifying treatment before being subjected to melt extrusion for later use:
(2) respectively mixing raw materials of each layer of the PETG/PET co-extrusion self-heat-sealing multilayer film according to the proportion, and then sending the mixture into different extruders for melting and plasticizing, 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 S2008);
the base layer 2 is prepared from the following raw materials in percentage by mass: 99.85% PET (FG 620, medium petrochemical characterized chemical fiber), 0.1% silica powder as an antiblocking agent, and 0.05% crodamide ER as a slip agent;
the adhesive layer 1 and the adhesive layer 2 are prepared from the following raw materials in percentage by mass: 60 percent of maleic anhydride grafted polypropylene (ADMER SE 800), 30 percent of PETG (SKYGREEN S2008) and 10 percent of carbon nanofibers;
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 melt after the melting and plasticizing on the same die head according to a set structural level, and enabling the melt to flow out of the die head, wherein the temperature of the die head is 285 ℃; then cooling and forming by a casting sheet roller to form a casting sheet for later use;
(4) preheating the cast sheet in a longitudinal stretching device, and then longitudinally stretching at the stretching temperature of 100 ℃, wherein the stretching ratio is 3.5 times, and cooling and shaping after longitudinal stretching;
(5) preheating the longitudinally stretched cast sheet in a transverse stretching device, and then transversely stretching at the stretching temperature of 110 ℃, wherein the stretching magnification is 4 times, and cooling and shaping after transverse stretching;
(6) after transverse stretching, rolling to obtain a PETG/PET co-extrusion self-heat-sealing multilayer film, wherein the thickness proportion of the base layer 1, the adhesive layers 1 and 2, the barrier layer and the base layer 2 is 30: 45: 8: 17.
example 3
(1) PET (FG 620, medium petrochemical characterized chemical fiber), PETG (SKYGREEN S2008), PA (MXD 6) and the like are subjected to drying and dehumidifying treatment before being subjected to melt extrusion for later use:
(2) respectively mixing raw materials of each layer of the PETG/PET co-extrusion self-heat-sealing multilayer film according to the proportion, and then sending the mixture into different extruders for melting and plasticizing, 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 S2008);
the base layer 2 is prepared from the following raw materials in percentage by mass: 99.75% PET (FG 620, medium petrochemical characterized chemical fiber), 0.2% silica powder as an antiblocking agent, and 0.05% crodamide ER as a slip agent;
the adhesive layer 1 and the adhesive layer 2 are prepared from the following raw materials in percentage by mass: 70 percent of maleic anhydride grafted polypropylene (ADMER SE 800), 25 percent of PETG (SKYGREEN S2008) and 5 percent of carbon nanofibers;
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 melt after the melting and plasticizing on the same die head according to a set structural level, and enabling the melt to flow out of the die head, wherein the temperature of the die head is 290 ℃; then cooling and forming by a casting sheet roller to form a casting sheet for later use;
(4) preheating the cast sheet in a longitudinal stretching device, and then longitudinally stretching at the stretching temperature of 100 ℃, wherein the stretching ratio is 3.0 times, and cooling and shaping after longitudinal stretching;
(5) preheating the longitudinally stretched cast sheet in a transverse stretching device, and then transversely stretching at the stretching temperature of 110 ℃, wherein the stretching magnification is 4 times, and cooling and shaping after transverse stretching;
(6) after transverse stretching, rolling to obtain a PETG/PET co-extrusion self-heat-sealing multilayer film, wherein the thickness proportion of the base layer 1, the adhesive 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 made of PETG (SKYGREEN S2008), the other layers had the same composition as in example 1, and the manufacturing method was the same as in example 1.
Comparative example 2
In the present embodiment, the adhesive layer 1 and the adhesive layer 2 are prepared from the following raw materials in percentage by mass: 75% maleic anhydride grafted polypropylene (ADMER SE 800) and 25% PETG (SKYGREEN S2008); the other layer composition was the same as in example 1, and the preparation method was the same as in example 1.
Comparative example 3
The barrier layer in this example was prepared from PA (MXD 6) alone, the composition of the other layers was the same as in example 1, and the preparation method was the same as in example 1.
The thickness, tensile strength, heat sealing temperature, heat sealing strength, elongation at break, water vapor permeability, oxygen permeability, and the like of the coextruded self-heat-sealable multilayer films prepared in examples 1 to 3 and comparative examples 1 to 3 were measured, respectively. The tensile strength and the elongation at break were performed according to the GB/T1040.3 method, the heat sealing performance was performed according to the BMSTT01 method, and the oxygen permeability and the like were performed according to the ASRM-related method. The results are shown in Table 1.
TABLE 1 Properties of different coextruded self-heat-sealable 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 entirely, 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 further, the tensile strength and elongation at break of the film were lower than those of example 1 and the water vapor and oxygen transmission were slightly higher than those of example 1.
When the carbon nanofibers were not included in the adhesive layer (comparative example 2), the heat-sealing property of the film was not much affected, and the tensile strength and elongation at break of the film were much lower than those of example 1.
When the barrier layer did not contain PETG (comparative example 3), it did not have much influence on the heat sealing property, tensile strength, etc. of the film, but severely affected the water vapor and oxygen transmission amount of the film.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. The PETG/PET co-extrusion self-heat-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-adhesion 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 carbon nanofibers; the barrier layer is a middle 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 an anti-blocking agent and 0-2% of a slipping agent;
the adhesive layer 1 and the adhesive 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 nanofibers;
the barrier layer comprises the following components in percentage by mass: 80-90% of PA and 10-20% of PETG.
2. The PETG/PET coextruded self-sealing multilayer film of claim 1 comprising five film layers characterized in that:
the melt index of the metallocene PE is 0.5-2 g/10 min.
3. The PETG/PET coextruded self-sealing multilayer film of claim 1 comprising five film layers characterized in that:
the PETG is SKYGREEN S2008, Istmann GN071 or Istmann 0603.
4. The PETG/PET coextruded self-sealing multilayer film of claim 1 comprising five film layers characterized in that:
the PA is at least one of MXD6 and Grivory G21.
5. The PETG/PET coextruded self-sealing multilayer film of claim 1 comprising five film layers characterized in that:
the melt index of the maleic anhydride grafted polypropylene is 4-8 g/10 min.
6. The PETG/PET coextruded self-sealing multilayer film of claim 1 comprising five film layers characterized in that:
the anti-blocking agent is at least one of silicon dioxide, talcum powder, clay and kaolin.
7. The PETG/PET coextruded self-sealing multilayer film of claim 1 comprising five film layers characterized in that:
the slipping agent is at least one of oleamide and erucamide.
8. The preparation method of the PETG/PET co-extrusion self-heat-sealing multilayer film as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
(1) respectively mixing raw materials of each layer of the PETG/PET co-extrusion self-heat-sealing multilayer film, and then carrying out melting plasticization in different extruders;
(2) extruding and converging the mixture in the same die head according to the set structural level, and enabling the melt to flow out of the die head; then cooling and forming by a casting sheet roller to form a casting sheet;
(3) and longitudinally stretching, transversely stretching and rolling the cast sheet to obtain the PETG/PET co-extrusion self-heat sealing multilayer film.
9. The PETG/PET co-extrusion self-heat-sealing multilayer film preparation method according to claim 8, characterized in that
The temperature of the die head in the step (2) is 285-290 ℃.
10. The PETG/PET co-extrusion self-heat-sealing multilayer film as claimed in any one of claims 1-7, which is applied to the field of packaging.
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