CN109648966B - High-barrier polyester film - Google Patents

High-barrier polyester film Download PDF

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Publication number
CN109648966B
CN109648966B CN201811613280.8A CN201811613280A CN109648966B CN 109648966 B CN109648966 B CN 109648966B CN 201811613280 A CN201811613280 A CN 201811613280A CN 109648966 B CN109648966 B CN 109648966B
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layer
polyester
acid
polyester film
temperature
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CN109648966A (en
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王钦
高青
鲍时萍
杜坤
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Hefei Lucky Science and Technology Industry Co Ltd
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Hefei Lucky Science and Technology Industry 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
    • 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
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/66—Polyesters containing oxygen in the form of ether groups
    • C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/672—Dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C08G63/82—Preparation processes characterised by the catalyst used
    • C08G63/85—Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds thereof
    • C08G63/86—Germanium, antimony, or compounds thereof
    • C08G63/866—Antimony or compounds thereof
    • C—CHEMISTRY; METALLURGY
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • 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
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Manufacturing & Machinery (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a high-barrier polyester film, which comprises at least one of an A layer or a B layer, wherein the A layer or/and the B layer comprise polyester modified by 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid; adopting a single-layer A, double-layer A/B and three-layer A/B/A co-extruded two-way stretching polyester film; the film thickness is 9-350 μm. The polyester film has high barrier property, greatly improves the water and oxygen barrier property of the polyester film, effectively simplifies the production process of the product, greatly reduces the production cost and improves the product quality. The product of the invention can be widely used in the fields of quantum dot film packaging, photovoltaic industry, packaging industry and the like.

Description

High-barrier polyester film
Technical Field
The invention relates to the technical field of films, in particular to a layered film prepared from synthetic resin.
Background
Since the twenty-first century, people have led to the rapid development of science and technology by using their own wisdom. With the rapid development of science and technology, the production technology of polyester films is becoming more and more perfect, the application range of the polyester films is gradually expanding, and the polyester films are widely used in the fields of packaging, electronics, electricity, magnetism, light sensing and the like due to the properties of high mechanical strength, good cold and heat resistance, stable shrinkage, excellent electrical insulation and the like.
With the rapid development of science and technology, the living standard of people is also continuously improved, and the requirements of people on material life are higher and higher while the living standard is continuously improved. For example, the quantum dot display technology gradually enters the visual field of people, and the core-quantum dot film in the quantum dot display technology has the advantages of narrow half-peak width (15 nm-25 nm), extremely high fluorescence quantum efficiency (90%), wider color gamut (150% NTSC) and the like, so that the quantum dot display technology occupies the role of chelate in the display industry. Green energy sources such as the photovoltaic industry are also receiving increasing attention. Whether the core of the quantum dot display technology is the quantum dot film, the core of the photovoltaic industry in green energy is the solar cell, or the specific package in the packaging industry, the polyester film is required to be used for packaging the solar cell, so that water vapor can be blocked, and the service life of the solar cell is ensured. The pure polyester film is easy to degrade and has high water vapor transmission rate, so that the high-barrier polyester film is required to meet the performance requirements of water vapor transmission rate and the like. The technical scheme of the existing solution is as follows: 1. depositing an inorganic coating on the plastic substrate by a plasma enhanced chemical vapor deposition method, vacuum sputtering or evaporation; 2. preparing emulsion by PVDC, and coating the emulsion on a polyester film substrate; 3. the PVDC and EVOH are used for carrying out multi-layer compounding with the polyester film.
Although the skilled artisan has conducted a great deal of research into barrier films, there are a number of problems with existing barrier film technology: 1. when an inorganic coating is deposited, the deposited inorganic coating is easy to have rough, uneven and non-compact surface, and the defects of vacuum, cracks and the like are easy to appear, so that the barrier property of the produced inorganic coating is reduced, and finally the quality of the high-barrier polyester film is reduced; 2. the PVDC emulsion is coated to produce the barrier film, so that the coating is easy to adhere and fall off in a severe environment, and the service life of the polyester film is directly influenced; 3. the PVDC and the EVOH are adopted to carry out multilayer compounding with the polyester film, so that the production process is complex, the production time and the raw material consumption are increased, and the production cost is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a high-barrier polyester film, can effectively solve the problems of complex production and processing, high production cost and the like of the high-barrier polyester film for the existing quantum dot film packaging, photovoltaic industry and packaging industry, and is particularly suitable for the fields of quantum dot film packaging, photovoltaic industry, packaging industry and the like.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
the high-barrier polyester film comprises at least one of an A layer or a B layer, wherein the A layer or/and the B layer comprise polyester modified by 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid.
In the high-barrier polyester film, the acid used by the modified polyester is terephthalic acid, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid, wherein the molar ratio of the terephthalic acid to the 2, 5-furandicarboxylic acid to the 2, 6-naphthalenedicarboxylic acid to the 1, 4-naphthalenedicarboxylic acid is 1: 1-4: 1.
The high-barrier polyester film comprises 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid, wherein the molar ratio of the 2, 5-furandicarboxylic acid to the 2, 6-naphthalenedicarboxylic acid to the 1, 4-naphthalenedicarboxylic acid is 1-6: 1-5: 1-3.
The thickness of the high-barrier polyester film is 9-350 mu m.
The high-barrier polyester film is a biaxially oriented polyester film obtained by single-layer A, double-layer A/B or three-layer A/B/A co-extrusion.
According to the high-barrier polyester film, the high-barrier polyester film adopts a single-layer structure A, and the thickness of the single-layer structure A is 9-350 μm.
According to the high-barrier polyester film, the high-barrier polyester film is of a double-layer structure A/B, and the thickness ratio of the layer A to the layer B is 1: 10-9: 20.
According to the high-barrier polyester film, the high-barrier polyester film is of a three-layer structure A/B/A, and the thickness ratio of the layer A to the layer B is 1: 20-7: 25.
The high-barrier polyester film is prepared by co-extruding through a die head, and performing sheet casting, longitudinal drawing, transverse drawing, sizing, drawing and rolling.
The invention has the beneficial effects that:
1. according to the invention, the layer A or/and the layer B comprise/comprises the polyester modified by 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid, and then the polyester is directly subjected to melt extrusion and stretch film forming to prepare the high-barrier polyester film, so that the process is simple, the cost is low, the service life of the polyester film is long, and the cost performance is high.
2. The invention starts from microstructure, modifies polyester and improves the barrier property of the polyester film. The negative effects brought by improving the barrier property of the polyester film in the prior art are completely avoided.
3. The invention greatly improves the barrier property of the polyester film and endows the polyester film with high performance.
4. When the polyester is modified, the adopted 2, 5-furandicarboxylic acid is derived from plant residues such as straws and rice hulls, so that the effect of recycling wastes can be realized.
Detailed Description
The high-barrier polyester film provided by the invention comprises at least one of an A layer or a B layer, wherein the A layer or/and the B layer comprise polyester modified by 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid. The acid used for modifying the polyester is terephthalic acid, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid, wherein the molar ratio of the terephthalic acid to the 2, 5-furandicarboxylic acid to the 2, 6-naphthalenedicarboxylic acid to the 1, 4-naphthalenedicarboxylic acid is 1: 1-4: 1. The molar ratio of the 2, 5-furandicarboxylic acid to the 2, 6-naphthalenedicarboxylic acid to the 1, 4-naphthalenedicarboxylic acid is 1-6: 1-5: 1-3. Wherein, the 2, 5-furandicarboxylic acid is an oxygen-containing five-membered ring structure, and the bond energy, hydrogen bond, van der waals force and the like are extremely large, so that the molecular internal energy is greatly increased; the 2, 6-naphthalene dicarboxylic acid and the 1, 4-naphthalene dicarboxylic acid contain naphthalene ring structures, and the naphthalene ring structures enable molecular arrangement to be more firm; in the process of modifying the polyester, the three are matched with each other, so that the modified polyester macromolecules are closely arranged, and the naphthalene ring structure crystal region amorphous region is filled with each other, thereby greatly improving the barrier property of the modified polyester. Therefore, after the polyester modified by the 2, 5-furandicarboxylic acid, the 2, 6-naphthalenedicarboxylic acid and the 1, 4-naphthalenedicarboxylic acid is added, the barrier property of the polyester film is greatly improved. The preparation method of the modified polyester comprises the following steps:
1. adding the needed dibasic acid, dihydric alcohol, catalyst and stabilizer into a polyester reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 to 5 hours at the temperature of 225 to 265 ℃ and under the condition of 250 KPa.
2. Judging the esterification end point according to the water yield, starting vacuumizing after the esterification is completed, carrying out polycondensation reaction for 2-4 h at the temperature of 265-280 ℃ and under the pressure of 20-60 Pa, and carrying out yarn making, cooling, grain cutting and drying to obtain the modified polyester.
The dibasic acid in the preparation process of the modified polyester is one or a combination of more of terephthalic acid, isophthalic acid, oxalic acid, adipic acid, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid, and the combination of terephthalic acid, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is preferred.
The dihydric alcohol in the preparation process of the modified polyester is one or a combination of a plurality of ethylene glycol, propylene glycol, butanediol and 1, 4-cyclohexanediol, and the combination of ethylene glycol and butanediol is preferred.
The catalyst in the preparation process of the modified polyester is one or a combination of more of ethylene glycol antimony, antimony trioxide, aluminum oxide, germanium dioxide and tetraethyl titanate, preferably the combination of ethylene glycol antimony and tetraethyl titanate, wherein the addition amount of the ethylene glycol antimony is 50 ppm-180 ppm, and the addition amount of the tetraethyl titanate is 40 ppm-150 ppm.
The stabilizer in the preparation process of the modified polyester is one or a combination of more of trimethyl phosphate, triethyl phosphate, triphenyl phosphate and phosphoric acid, preferably triethyl phosphate, wherein the addition amount of the triethyl phosphate is 10ppm to 150 ppm.
The high-barrier polyester film adopts a single-layer A, double-layer A/B and three-layer A/B/A co-extruded two-way stretching polyester film, and the thickness of the film is 9-350 mu m.
The single-layer structure A is adopted, and the thickness of the single-layer structure A is 9-350 mu m.
A double-layer structure A/B is adopted, and the thickness ratio of the layer A to the layer B is 1: 10-9: 20.
A three-layer structure A/B/A is adopted, and the thickness ratio of the layer A to the layer B is 1: 20-7: 25.
Generally, in order to increase the smoothness of the polyester film and improve the winding and slitting performance of the polyester film, micron-sized smooth particles, such as silica, calcium carbonate, kaolin, etc., are often added into the surface layer (layer a) at a certain concentration.
Then, the composite material is prepared by co-extrusion through a die head, sheet casting, longitudinal drawing, transverse drawing, shaping, traction and rolling. The specific preparation method of the high-barrier polyester film comprises the following steps:
1. the modified polyester prepared by the invention is used as the polyester raw material of the layer A or/and the layer B, the conventional polyester is used as the polyester raw material of the layer A or/and the layer B, and the polyester master batch containing micron-sized smooth particles is used as the polyester raw material of the layer A, and the modified polyester, the conventional polyester and the polyester master batch are added into a corresponding extrusion system together for melt extrusion.
2. The melt is co-extruded through a die head and cast on a casting sheet roller to form a single-layer or multi-layer co-extruded casting sheet, and the temperature of the casting sheet roller is 18-30 ℃.
3. And longitudinally stretching the cast sheet, wherein the longitudinal stretching temperature is 65-85 ℃, and the longitudinal stretching ratio is 2.7-4.0.
4. And transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.4-4.7.
5. And (3) shaping and cooling the stretched film, wherein the shaping temperature is 225-240 ℃, and the cooling temperature is 45-60 ℃.
6. And drawing and winding the cooled film.
The modified polyester in the preparation process of the high-barrier polyester film is the modified polyester prepared by the invention.
The conventional polyester in the preparation process of the high-barrier polyester film is ethylene terephthalate.
The polyester master batch in the preparation process of the high-barrier polyester film is ethylene terephthalate containing micron-sized smooth particles.
The present invention is further illustrated by the following examples, but the scope of the invention is not limited to these examples.
Example 1
Preparation of modified polyester:
according to the molar ratio of 1:1.2, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 1:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 1:1:1, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 2: 1; adding ethylene glycol antimony in an amount of 50ppm, adding tetraethyl titanate in an amount of 40ppm, adding triethyl phosphate in an amount of 10ppm, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 hours at the temperature of 225-265 ℃ and under the condition of 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 4 hours at the temperature of 265-280 ℃ and under the condition of 35Pa, and the modified polyester is prepared after the processes of yarn making, cooling, grain cutting and drying.
Adding the modified polyester and the smooth polyester master batch containing silicon dioxide with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 300ppm, into a corresponding extrusion system, melting, extruding through a die head, casting onto a casting sheet roller to form a single-layer A extruded casting sheet, wherein the temperature of the casting sheet roller is 25 ℃; longitudinally stretching the cast sheet at the longitudinal stretching temperature of 65-85 ℃ and the longitudinal stretching ratio of 4.0; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 4.7; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 225 ℃, the cooling temperature is 50 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 9 mu m.
Example 2
Preparation of modified polyester:
according to the molar ratio of 1:1.3 of dibasic acid to dihydric alcohol, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 1:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 1:2:1, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 3: 1; the method comprises the following steps of adding ethylene glycol antimony in an amount of 50ppm, tetraethyl titanate in an amount of 100ppm and triethyl phosphate in an amount of 15ppm, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 hours at the temperature of 225-265 ℃ and under the condition of 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3 hours at the temperature of 265-280 ℃ and under the condition of 30Pa, and the modified polyester is prepared after the processes of yarn making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 300ppm, and the mixture of the polyester raw material serving as the layer A and the polyester raw material serving as the layer B of the conventional polyester is added into a corresponding extrusion system together, melting, co-extruding through a die head, and casting onto a casting sheet roller to form an AB layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 30 ℃; longitudinally stretching the cast sheet at the longitudinal stretching temperature of 65-85 ℃ and the longitudinal stretching ratio of 4.0; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 4.5; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 225 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 23 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 10.
Example 3
Preparation of modified polyester:
according to the molar ratio of 1:1.35, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 2:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 2:3:1, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 3: 1; adding ethylene glycol antimony in an amount of 50ppm, tetraethyl titanate in an amount of 100ppm and triethyl phosphate in an amount of 30ppm, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3.5h at the temperature of 265-280 ℃ and under the condition of 40Pa, and the modified polyester is prepared by filament making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 200ppm, and the mixture of the polyester raw material serving as the layer A and the polyester raw material serving as the layer B of the conventional polyester is added into a corresponding extrusion system together, melting, co-extruding through a die head, and casting onto a casting sheet roller to form an AB layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.8; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 4.3; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 230 ℃, the cooling temperature is 50 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 50 mu m, wherein the thickness ratio of the layer A to the layer B is 3: 10.
Example 4
Preparation of modified polyester:
according to the molar ratio of 1:1.35, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 3:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 3:2:2, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 2: 1; adding 100ppm of ethylene glycol antimony, 100ppm of tetraethyl titanate and 50ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3.5 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3 hours at the temperature of 265-280 ℃ and under the condition of 25Pa, and the modified polyester is prepared after the processes of yarn making, cooling, grain cutting and drying.
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 220ppm, and the mixture of the polyester raw material serving as the layer A and the prepared modified polyester serving as the polyester raw material of the layer B into a corresponding extrusion system, melting, co-extruding through a die head, casting onto a casting sheet roller to form an AB layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.7; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 4.0; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 235 ℃, the cooling temperature is 45 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 100 mu m, wherein the thickness ratio of the layer A to the layer B is 7: 20.
Example 5
Preparation of modified polyester:
according to the molar ratio of 1:1.4, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 3:2:1, the molar ratio of 2:1, 2, 5-furandicarboxylic acid to 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 3:2:1, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 4: 1; adding 100ppm of ethylene glycol antimony, 100ppm of tetraethyl titanate and 70ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 4 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3.5h at the temperature of 265-280 ℃ and under the condition of 40Pa, and the modified polyester is prepared by filament making, cooling, grain cutting and drying.
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 220ppm, and the mixture of the polyester raw material serving as the layer A and the prepared modified polyester serving as the polyester raw material of the layer B into a corresponding extrusion system, melting, co-extruding through a die head, casting onto a casting sheet roller to form an AB layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.7; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 4.0; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 235 ℃, the cooling temperature is 45 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 100 mu m, wherein the thickness ratio of the layer A to the layer B is 9: 20.
Example 6
Preparation of modified polyester:
according to the molar ratio of 1:1.4, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 3:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 1:2:3, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 5: 1; adding 150ppm of ethylene glycol antimony, 100ppm of tetraethyl titanate and 100ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 4 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3 hours at the temperature of 265-280 ℃ and under the condition of 20Pa, and the modified polyester is prepared after the processes of yarn making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 300ppm, and the mixture of the polyester raw material serving as the layer A and the polyester raw material serving as the layer B of the conventional polyester into a corresponding extrusion system, melting, co-extruding through a die head, casting onto a casting sheet roller to form an ABA layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 24 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.8; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 4.3; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 230 ℃, the cooling temperature is 50 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 50 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 20.
Example 7
Preparation of modified polyester:
according to the molar ratio of 1:1.45, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 4:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 4:3:1, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 1: 1; adding 150ppm of ethylene glycol antimony, 150ppm of tetraethyl titanate and 150ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 4.5 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3.5h at the temperature of 265-280 ℃ and under the condition of 45Pa, and the modified polyester is prepared by filament making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 280ppm, and the mixture of the polyester raw material serving as the layer A and the polyester raw material serving as the layer B of the conventional polyester into a corresponding extrusion system, melting, co-extruding through a die head, casting onto a casting sheet roller to form an ABA layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.5; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.8; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 235 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 125 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 10.
Example 8
Preparation of modified polyester:
according to the molar ratio of 1:1.45, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 4:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 4:3:1, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 1: 1; adding 150ppm of ethylene glycol antimony, 150ppm of tetraethyl titanate and 150ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 4.5 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3.5h at the temperature of 265-280 ℃ and under the condition of 45Pa, and the modified polyester is prepared by filament making, cooling, grain cutting and drying.
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 280ppm, and the mixture of the polyester raw material serving as the layer A and the prepared modified polyester serving as the polyester raw material of the layer B into a corresponding extrusion system, melting, co-extruding through a die head, casting onto a casting sheet roller to form an ABA layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.5; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.8; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 235 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 125 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 10.
Example 9
Preparation of modified polyester:
according to the molar ratio of 1:1.25 of dibasic acid to dihydric alcohol, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 4:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 3:1:2, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 5: 1; adding ethylene glycol antimony in an amount of 110ppm, tetraethyl titanate in an amount of 90ppm and triethyl phosphate in an amount of 35ppm, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 hours at the temperature of 225-265 ℃ and under the condition of 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3.5h at the temperature of 265-280 ℃ and under the condition of 50Pa, and the modified polyester is prepared by filament making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 300ppm, and the mixture of the polyester raw material serving as the layer A and the polyester raw material serving as the layer B of the conventional polyester into a corresponding extrusion system, melting, co-extruding through a die head, casting onto a casting sheet roller to form an ABA layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.1; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.6; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 235 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain a high-barrier polyester film with the thickness of 188 mu m, wherein the thickness ratio of the layer A to the layer B is 3: 20.
Example 10
Preparation of modified polyester:
according to the molar ratio of 1:1.3 of dibasic acid to dihydric alcohol, wherein the molar ratio of 3:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid to terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid to each other is 3:5:2, and the molar ratio of 3:2 of glycol to butanediol to the dihydric alcohol; adding 150ppm of ethylene glycol antimony, 100ppm of tetraethyl titanate and 20ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 2.5h at the temperature of 265-280 ℃ and under the condition of 35Pa, and the modified polyester is prepared by filament making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 350ppm, and the mixture of the polyester raw material serving as the layer A and the polyester raw material serving as the layer B of the conventional polyester is added into a corresponding extrusion system together, melting, co-extruding through a die head, and casting onto a casting sheet roller to form an ABA layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 22 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.0; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.5; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 240 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 250 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 5.
Example 11
Preparation of modified polyester:
according to the molar ratio of 1:1.25 of dibasic acid to dihydric alcohol, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 4:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 6:5:3, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 5: 1; adding 180ppm of ethylene glycol antimony, 90ppm of tetraethyl titanate and 50ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3 hours at the temperature of 265-280 ℃ and under the condition of 30Pa, and the modified polyester is prepared after the processes of yarn making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 350ppm, and the mixture of the polyester raw material serving as the layer A and the polyester raw material serving as the layer B of the conventional polyester is added into a corresponding extrusion system together, melting, co-extruding through a die head, and casting onto a casting sheet roller to form an ABA layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 21 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 2.9; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.41; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 240 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 350 mu m, wherein the thickness ratio of the layer A to the layer B is 7: 25.
Example 12
Preparation of modified polyester:
according to the molar ratio of 1:1.25 of dibasic acid to dihydric alcohol, wherein the molar ratio of terephthalic acid to 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid in the dibasic acid is 4:1, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid is 6:5:3, and the molar ratio of ethylene glycol to butanediol in the dibasic alcohol is 5: 1; adding 180ppm of ethylene glycol antimony, 90ppm of tetraethyl titanate and 50ppm of triethyl phosphate, uniformly mixing, adding into a polyester synthesis reaction kettle, pulping for 15 minutes, introducing nitrogen for protection, and esterifying for 3 hours at 225-265 ℃ and 250 KPa; after the esterification is finished, the vacuum pumping is started, the polycondensation reaction is carried out for 3 hours at the temperature of 265-280 ℃ and under the condition of 30Pa, and the modified polyester is prepared after the processes of yarn making, cooling, grain cutting and drying.
Adding the prepared modified polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 350ppm, and the mixture of the polyester raw material as the layer A and the prepared modified polyester as the polyester raw material of the layer B into a corresponding extrusion system, melting, co-extruding through a die head, casting onto a casting sheet roller to form an ABA layer co-extruded casting sheet, wherein the temperature of the casting sheet roller is 21 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 2.9; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.41; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 240 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 350 mu m, wherein the thickness ratio of the layer A to the layer B is 7: 25.
Comparative example 1
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 300ppm, and the mixture of the polyester raw material serving as the layer A and the conventional polyester as the polyester raw material of the layer B is added into a corresponding extrusion system together, carrying out melting and co-extrusion through a die head, and casting the mixture onto a casting sheet roller to form an ABA layer co-extrusion casting sheet, wherein the temperature of the casting sheet roller is 24 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.8; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 4.3; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 230 ℃, the cooling temperature is 50 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 50 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 20.
Comparative example 2
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 280ppm, and the mixture of the polyester raw material serving as the layer A and the conventional polyester as the polyester raw material of the layer B is added into a corresponding extrusion system together, carrying out melting and co-extrusion through a die head, and carrying out tape casting on a casting sheet roller to form an ABA layer co-extrusion casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.5; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.8; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 235 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 125 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 10.
Comparative example 3
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 300ppm, and the mixture of the polyester raw material serving as the layer A and the conventional polyester as the polyester raw material of the layer B is added into a corresponding extrusion system together, carrying out melting and co-extrusion through a die head, and carrying out tape casting on a casting sheet roller to form an ABA layer co-extrusion casting sheet, wherein the temperature of the casting sheet roller is 23 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.1; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.6; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 235 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain a high-barrier polyester film with the thickness of 188 mu m, wherein the thickness ratio of the layer A to the layer B is 3: 20.
Comparative example 4
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 350ppm, and the mixture of the polyester raw material serving as the layer A and the conventional polyester as the polyester raw material of the layer B is added into a corresponding extrusion system together, carrying out melting and co-extrusion through a die head, and carrying out tape casting on a casting sheet roller to form an ABA layer co-extrusion casting sheet, wherein the temperature of the casting sheet roller is 22 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 3.0; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.5; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 240 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 250 mu m, wherein the thickness ratio of the layer A to the layer B is 1: 5.
Comparative example 5
Adding conventional polyester and a silicon dioxide smooth polyester master batch with the average particle size of 2.0 mu m, wherein the content of silicon dioxide particles with the average particle size of 2.0 mu m in the total polyester is 350ppm, and the mixture of the polyester raw material serving as the layer A and the conventional polyester as the polyester raw material of the layer B is added into a corresponding extrusion system together, carrying out melting and co-extrusion through a die head, and carrying out tape casting on a casting sheet roller to form an ABA layer co-extrusion casting sheet, wherein the temperature of the casting sheet roller is 21 ℃; longitudinally stretching the cast sheet at a longitudinal stretching temperature of 65-85 ℃ and a longitudinal stretching ratio of 2.9; transversely stretching the longitudinally-stretched sheet at the transverse stretching temperature of 110-125 ℃ and the transverse stretching ratio of 3.41; and (3) shaping and cooling the stretched film, wherein the shaping temperature is 240 ℃, the cooling temperature is 55 ℃, and the cooled film is drawn and rolled to obtain the high-barrier polyester film with the thickness of 350 mu m, wherein the thickness ratio of the layer A to the layer B is 7: 25.
Effects of the invention
Figure GDA0001975132110000131
Figure GDA0001975132110000141
The thickness test method comprises the following steps: GB/T33399-2016
The water vapor transmission rate testing method comprises the following steps: GB/T21529-2008
The oxygen transmission rate test method comprises the following steps: GB/T1038-2000
Since the smaller the water vapor transmission rate and the oxygen transmission rate values are, the better the water oxygen barrier property of the polyester film is, it can be seen by comparing example 6 with comparative example 1, example 7.8 with comparative example 2, example 9 with comparative example 3, example 10 with comparative example 4, example 11.12 with comparative example 5, respectively, that the water oxygen barrier property of the high barrier polyester film of the present invention is far better than that of the conventional polyester film under the same polyester film thickness and film-making process conditions.

Claims (8)

1. A high-barrier polyester film comprises at least one of an A layer or a B layer, and is characterized in that the A layer or/and the B layer comprises polyester modified by 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid;
the acid used by the modified polyester is terephthalic acid, 2, 5-furandicarboxylic acid, 2, 6-naphthalenedicarboxylic acid and 1, 4-naphthalenedicarboxylic acid, wherein the molar ratio of the terephthalic acid to the 2, 5-furandicarboxylic acid to the 2, 6-naphthalenedicarboxylic acid to the 1, 4-naphthalenedicarboxylic acid is 1: 1-4: 1.
2. The high barrier polyester film according to claim 1, wherein the molar ratio of 2, 5-furandicarboxylic acid to 2, 6-naphthalenedicarboxylic acid to 1, 4-naphthalenedicarboxylic acid is 1-6: 1-5: 1-3.
3. The high barrier polyester film according to claim 1, wherein the thickness of the high barrier polyester film is 9 to 350 μm.
4. The high-barrier polyester film according to claim 1, wherein the high-barrier polyester film is a biaxially oriented polyester film obtained by single-layer A, double-layer A/B or triple-layer A/B/A coextrusion.
5. The high barrier polyester film according to claim 1, wherein the thickness of the single-layer structure A is 9 μm to 350 μm.
6. The high-barrier polyester film according to claim 1, wherein when the high-barrier polyester film adopts a double-layer structure A/B, the thickness ratio of the layer A to the layer B is 1: 10-9: 20.
7. The high-barrier polyester film according to claim 1, wherein when the high-barrier polyester film adopts a three-layer structure A/B/A, the thickness ratio of the layer A to the layer B is 1: 20-7: 25.
8. The high barrier polyester film according to any one of claims 1 to 7, wherein the high barrier polyester film is prepared by die co-extrusion, sheet casting, longitudinal drawing, transverse drawing, sizing, drawing and winding.
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