CN110920184A - Preparation method of blended polyester iron-clad film and film-clad metal plate thereof - Google Patents
Preparation method of blended polyester iron-clad film and film-clad metal plate thereof Download PDFInfo
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- CN110920184A CN110920184A CN201811090592.5A CN201811090592A CN110920184A CN 110920184 A CN110920184 A CN 110920184A CN 201811090592 A CN201811090592 A CN 201811090592A CN 110920184 A CN110920184 A CN 110920184A
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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
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/09—Layered products comprising a layer of metal comprising metal 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 comprising polyesters
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
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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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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- Laminated Bodies (AREA)
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Abstract
The invention discloses a preparation method of a blended polyester iron-clad film, belonging to the field of polyester films and comprising the following steps: s1: preparation of blend polyester mixture: uniformly mixing polyethylene terephthalate and polybutylene terephthalate to form a uniformly mixed blended polyester mixture; s2: preparation of modified blend polyester mixtures: adding 1800ppm SiO by mass into the blended polyester mixture by adopting an in-situ polymerization mode2To obtain a SiO content of 1800ppm2The blended polyester mixture of (a); s3 preparation of the blended polyester iron-clad film: the blended polyester iron-clad film comprising an upper layer, a middle layer and a lower layer is formed by adopting a co-extrusion biaxial stretching method, wherein the surface layer contains 1800ppm SiO2The blended polyester film of (1). The blended polyester coated iron film obtained by the method can obtain a coated metal plate with excellent comprehensive performance, and the coated metal plate can be used for food and beverage packaging containers.
Description
Technical Field
The invention relates to the field of film-coated metal plates for metal packaging, in particular to a preparation method of a blended polyester iron-coated film and a film-coated metal plate thereof.
Background
In recent years, the industry of polyethylene terephthalate (PET) has been developed rapidly, a large number of famous companies for producing PET materials and PET equipment are available at home and abroad, the world yield of PET has leaped the fifth position of engineering plastics in 1987, and films are an important branch in the application field of PET materials and are widely applied to the packaging field of foods and beverages. In recent years, with the rise of metal coating technology, the problem of precipitation of harmful substances, namely Bis-phenol a, caused by coating process on the inner side of the traditional metal can is overcome by combining an iron coating with a metal plate in a hot melting and laminating manner, and the problem is highly regarded by the global scope. With the gradual popularization of the metal plate laminating technology, the iron-clad laminate replaces the coating to improve the safety of the filled food and is widely accepted.
When the existing film-coated metal plate is widely applied to food and beverage packaging containers, high-temperature sterilization is often required to be carried out on the filled food and beverage for a long time in a high-temperature cooking mode, and the existing film-coated iron/film-coated tank can have an obvious film color change phenomenon after high-temperature cooking sterilization, so that the appearance of the packaging container is seriously influenced.
Disclosure of Invention
The invention aims to provide a method for preparing coated iron with excellent anti-boiling discoloration characteristics, and the coated iron prepared by the method has excellent comprehensive properties when being applied to food and beverage packaging containers.
In order to achieve the above object, the present invention adopts the following technical solutions.
According to one aspect of the invention, the preparation method of the blended polyester coated iron film applied to the packaging of middle-high-end food and beverage is provided, the blended polyester coated iron film comprises polyethylene terephthalate and polybutylene terephthalate and consists of an upper layer, a middle layer and a lower layer, and one surface layer in the blended polyester coated iron film comprises SiO which is added in an in-situ polymerization mode and has the mass part of 1800ppm2，
The preparation method comprises the following steps:
s1: preparation of blend polyester mixture:
uniformly mixing polyethylene terephthalate and polybutylene terephthalate to form a uniformly mixed polyester blend of the polyethylene terephthalate and the polybutylene terephthalate;
s2: preparation of modified blend polyester mixtures:
adding 1800ppm SiO by mass into the blended polyester mixture by adopting an in-situ polymerization mode2To obtain a SiO content of 1800ppm2The blended polyester mixture of (a);
s3 preparation of the blended polyester iron-clad film:
the blended polyester iron-clad film comprising an upper layer, a middle layer and a lower layer is formed by adopting a co-extrusion biaxial stretching method, wherein the surface layer contains 1800ppm SiO2The blended polyester film of (1).
In the preparation method of the blended polyester iron-clad film applied to the middle and high-end food and beverage packaging according to the invention, the step S3 adopts a co-extrusion biaxial stretching method to prepare the blended polyester iron-clad film comprising the upper layer, the middle layer and the lower layer at the temperature of 240-275 ℃.
In the retort discoloration resistant blended polyester iron-clad film according to one aspect of the invention, the part ratio of the polyethylene terephthalate to the polybutylene terephthalate is 6:4, 5:5, or 4: 6.
In the boiling discoloration resistant blended polyester coated iron film according to one aspect of the invention, the intrinsic viscosity of the blended polyester coated iron film is more than 0.75 dL/g.
In the retort discoloration resistant blended polyester coated iron film according to one aspect of the present invention, the thickness of the blended polyester coated iron film is 12 to 35 um.
According to another aspect of the present invention, there is provided a laminated metal sheet comprising a metal substrate and a retort discoloration resistant blended polyester laminated iron film as described above.
In the coated metal plate according to another aspect of the invention, the boiling discoloration resistant blended polyester coated iron film is thermally coated on the surface of the metal substrate by adopting a hot melting mode at the temperature of 245 ℃ under the pressure of 5 Kg.
In the coated metal sheet according to another aspect of the present invention, the metal substrate has a thickness of 0.16mm, and the material is selected from the group consisting of a chromium-plated steel sheet, a tin-plated steel sheet, a low-tin steel sheet, a zinc-plated steel sheet, a cold-rolled steel sheet, a stainless steel sheet, and an aluminum sheet.
According to a further aspect of the present invention, there is provided a film-covered metal can for use in medium-to high-end food and beverage packaging, the film-covered metal can being made of the film-covered metal sheet as claimed above.
Compared with the prior art, the invention has the following beneficial effects:
the invention mixes the polyethylene terephthalate and polybutylene terephthalate according to the proportion and produces the film by three-layer coextrusion method, wherein one surface layer of the film contains 1800ppm SiO2So that the film-coated metal plate prepared from the blended polyester film has excellent boiling discoloration resistance, and is applied to metal containers for food and beverage packaging which need high-temperature sterilization.
SiO2 is added into the polymer through in-situ polymerization, so that the crystallization performance of the polyester film is uniformly improved on the whole; and avoids the addition of high melting point resin into the film by improving the traditional way of adding SiO2 in the form of master batch. The two points obviously improve the comprehensive performance of the polyester film, and the complex processing resistance, the corrosion resistance and the like of the coated iron containing the film are obviously improved.
Detailed Description
The objects, features, and advantages of the present invention will become more apparent in the detailed description set forth below by way of non-limiting examples, the contents of which are sufficient to enable one skilled in the art to understand and practice the present invention.
According to one aspect of the invention, the preparation method of the blended polyester coated iron film applied to the packaging of middle-high-end food and beverage is provided, the blended polyester coated iron film comprises polyethylene terephthalate and polybutylene terephthalate and consists of an upper layer, a middle layer and a lower layer, and one surface layer in the blended polyester coated iron film comprises SiO which is added in an in-situ polymerization mode and has the mass part of 1800ppm2，
The preparation method comprises the following steps:
s1: preparation of blend polyester mixture:
uniformly mixing polyethylene terephthalate and polybutylene terephthalate to form a uniformly mixed polyester blend of the polyethylene terephthalate and the polybutylene terephthalate;
s2: preparation of modified blend polyester mixtures:
adding 1800ppm SiO by mass into the blended polyester mixture by adopting an in-situ polymerization mode2To obtain a SiO content of 1800ppm2The blended polyester mixture of (a);
s3 preparation of the blended polyester iron-clad film:
the blended polyester iron-clad film comprising an upper layer, a middle layer and a lower layer is formed by adopting a co-extrusion biaxial stretching method, wherein the surface layer contains 1800ppm SiO2The blended polyester film of (1).
In the preparation method of the blended polyester iron-clad film applied to the middle and high-end food and beverage packaging according to the invention, the step S3 adopts a co-extrusion biaxial stretching method to prepare the blended polyester iron-clad film comprising the upper layer, the middle layer and the lower layer at the temperature of 240-275 ℃.
In the retort discoloration resistant blended polyester iron-clad film according to one aspect of the invention, the part ratio of the polyethylene terephthalate to the polybutylene terephthalate is 6:4, 5:5, or 4: 6.
In the boiling discoloration resistant blended polyester coated iron film according to one aspect of the invention, the intrinsic viscosity of the blended polyester coated iron film is more than 0.75 dL/g.
In the retort discoloration resistant blended polyester coated iron film according to one aspect of the present invention, the thickness of the blended polyester coated iron film is 12 to 35 um.
Example 1
The production process of blended polyester iron-clad film includes biaxial stretching at 240 deg.c and 275 deg.c, mixing homogeneously the blended polyester, and extruding through upper, middle and lower layers to produce film of thickness 15um and with surface layer containing 1800ppm SiO2。
Example 2
The production method of the blended polyester coated iron film is characterized in that the blended polyester coated iron film is manufactured by adopting a biaxial stretching method, the manufacturing temperature is 240-275 ℃, the blended polyester coated iron film comprises 4 parts of polyethylene terephthalate and 6 parts of polybutylene terephthalate, the uniformly mixed blended polyester is uniformly mixed, an upper-layer, middle-layer and lower-layer co-extrusion biaxial stretching method is adopted to manufacture a film, the thickness of the film is 15 mu m, and one surface layer of the blended polyester film contains 1800ppm of SiO 2.
Example 3
The production method of the blended polyester coated iron film is characterized in that the blended polyester coated iron film is manufactured by adopting a biaxial stretching method, the manufacturing temperature is 240-275 ℃, the blended polyester coated iron film comprises 6 parts of polyethylene terephthalate and 4 parts of polybutylene terephthalate, the uniformly mixed blended polyester is uniformly mixed, an upper-layer, middle-layer and lower-layer co-extrusion biaxial stretching method is adopted to manufacture a film, the thickness of the film is 20 mu m, and one surface layer of the blended polyester film contains 1800ppm of SiO 2.
Example 4
The production method of the blended polyester coated iron film is characterized in that the blended polyester coated iron film is manufactured by adopting a biaxial stretching method, the manufacturing temperature is 240-275 ℃, the blended polyester coated iron film comprises 6 parts of polyethylene terephthalate and 4 parts of polybutylene terephthalate, the uniformly mixed blended polyester is uniformly mixed, an upper-layer, middle-layer and lower-layer co-extrusion biaxial stretching method is adopted to manufacture a film, the thickness of the film is 35 mu m, and one surface layer of the blended polyester film contains 1800ppm of SiO 2.
Example 5
The production method of the blended polyester iron-clad film is characterized in that the blended polyester iron-clad film is manufactured by a biaxial stretching method, the manufacturing temperature is 240-275 ℃, the blended polyester iron-clad film comprises 5 parts of polyethylene terephthalate and 5 parts of polybutylene terephthalate, the uniformly mixed blended polyester is uniformly mixed, an upper-layer, middle-layer and lower-layer co-extrusion biaxial stretching method is adopted to manufacture a film, the thickness of the film is 12 mu m, and one surface layer of the blended polyester film contains 1800ppm of SiO 2.
Example 6
The production method of the blended polyester coated iron film is characterized in that the blended polyester coated iron film is manufactured by adopting a biaxial stretching method, the manufacturing temperature is 240-275 ℃, the blended polyester coated iron film comprises 4 parts of polyethylene terephthalate and 6 parts of polybutylene terephthalate, the uniformly mixed blended polyester is uniformly mixed, an upper-layer, middle-layer and lower-layer co-extrusion biaxial stretching method is adopted to manufacture a film, the thickness of the film is 35 mu m, and one surface layer of the blended polyester film contains 1800ppm of SiO 2.
In the six embodiments, the blend polyester iron-clad film with a small thickness can be prepared by uniformly blending and then preparing the film, and the formability of the film prepared by the biaxial stretching method is good. The blended polyester coated iron film can be used for obtaining coated metal plates with excellent comprehensive performance for food and beverage packaging containers, and the prepared coated metal plates and the packaging containers thereof have excellent steaming and boiling discoloration resistance.
The blended polyester films prepared in the examples 1 to 6 were thermally laminated on the surface of a chromium-plated steel plate with a thickness of 0.16mm at 245 ℃ under a pressure of 5Kg to prepare a film-coated metal plate, and a 538 can body was prepared by using an experimental can-making mold, and the film and the chromium-plated steel plate were not separated during the stamping and deformation processes of the can-making. The sample of the tank body is steamed and boiled for 45min at the temperature of 121 ℃, the coated steel plate has no steaming discoloration phenomenon, and the film surface of any part of the tank body does not wrinkle and does not separate from the steel plate.
Similarly, the polyester blend films of examples 1 to 6 were hot-laminated on the surfaces of tin-plated steel sheets, low-tin steel sheets, zinc-plated steel sheets, cold-rolled steel sheets, stainless steel sheets, aluminum sheets, etc. by the above-mentioned method, and were autoclaved in water, an acid, an aqueous solution containing sulfur, etc. in the same manner as above, the surface of the film was free from retort discoloration, and the surface of the film was free from wrinkles and peeling from the metal sheets. Can be widely applied to the food and beverage metal packaging industry needing high-temperature sterilization.
SiO2 is added into the polymer through in-situ polymerization, so that the crystallization performance of the polyester film is uniformly improved on the whole; and avoids the addition of high melting point resin into the film by improving the traditional way of adding SiO2 in the form of master batch. The two points obviously improve the comprehensive performance of the polyester film, and the complex processing resistance, the corrosion resistance and the like of the coated iron containing the film are obviously improved.
Finally, it should be noted that while the present invention has been described with reference to the specific embodiments thereof, it should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be construed as limiting the present invention, and various equivalent changes and substitutions may be made therein without departing from the spirit of the present invention, and therefore, it is intended that all changes and modifications to the above embodiments within the spirit and scope of the present invention be covered by the appended claims.
Claims (9)
1. A preparation method of a blended polyester iron-clad film applied to packaging of middle-high-end food and beverage is characterized by comprising the following steps: the blended polyester coated iron film comprises polyethylene terephthalate and poly (p-phenylene)The blended polyester iron-clad film comprises an upper layer, a middle layer and a lower layer, wherein one surface layer in the blended polyester iron-clad film comprises SiO which is added in an in-situ polymerization mode and has the mass part of 1800ppm2，
The preparation method comprises the following steps:
s1: preparation of blend polyester mixture:
uniformly mixing polyethylene terephthalate and polybutylene terephthalate to form a uniformly mixed polyester blend of the polyethylene terephthalate and the polybutylene terephthalate;
s2: preparation of modified blend polyester mixtures:
adding 1800ppm SiO by mass into the blended polyester mixture by adopting an in-situ polymerization mode2To obtain a SiO content of 1800ppm2The blended polyester mixture of (a);
s3 preparation of the blended polyester iron-clad film:
the blended polyester iron-clad film comprising an upper layer, a middle layer and a lower layer is formed by adopting a co-extrusion biaxial stretching method, wherein the surface layer contains 1800ppm SiO2The blended polyester film of (1).
2. The preparation method of the blended polyester coated iron film applied to the packaging of middle and high-end food and beverage as claimed in claim 1, wherein the preparation method comprises the following steps:
in the step S3, a co-extrusion biaxial stretching method is adopted to prepare the blended polyester iron-clad film comprising an upper layer, a middle layer and a lower layer at the temperature of 240-275 ℃.
3. The blended polyester iron-clad film applied to middle and high-end food and beverage packaging as claimed in claim 1, wherein: the part ratio of the polyethylene terephthalate to the polybutylene terephthalate is 6:4, 5:5 or 4: 6.
4. The preparation method of the blended polyester coated iron film applied to the packaging of middle and high-end food and beverage as claimed in claim 1 or 2, characterized in that: the intrinsic viscosity of the blended polyester coated iron film is more than 0.75 dL/g.
5. The preparation method of the blended polyester coated iron film applied to the packaging of middle and high-end food and beverage as claimed in claim 1, wherein the preparation method comprises the following steps: the thickness of the blended polyester coated iron film is 12-35 um.
6. The utility model provides a be applied to tectorial membrane metal sheet of well high-end food and beverage packing which characterized in that: the coated metal sheet comprises a metal substrate and a blended polyester iron-coated film prepared by the method of any one of claims 1 to 5.
7. The coated metal sheet defined in claim 6, wherein: the blended polyester iron-clad film is thermally laminated on the surface of the metal substrate by adopting a hot melting mode under the pressure of 5Kg and the temperature of 245 ℃.
8. The coated metal sheet defined in claim 6, wherein: the thickness of the metal substrate is 0.15mm, and the metal plate is selected from a chromium-plated steel plate, a tin-plated steel plate, a low-tin steel plate, a zinc-plated steel plate, a cold-rolled steel plate, a stainless steel plate and an aluminum plate.
9. A film-coated metal can for middle and high end food and beverage packaging, characterized in that the film-coated metal can is made of the film-coated metal sheet according to any one of claims 6 to 8.
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Cited By (1)
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| CN113548312A (en) * | 2020-04-23 | 2021-10-26 | 内蒙古伊利实业集团股份有限公司 | High-light-resistance high-barrier heat-shrinkable polyester film and preparation method and application thereof |
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| CN106029511A (en) * | 2014-02-21 | 2016-10-12 | 杰富意钢铁株式会社 | Resin-coated metal plate for container and production method therefor |
| CN107000892A (en) * | 2014-12-12 | 2017-08-01 | 杰富意钢铁株式会社 | Cover resin-coated metal sheet |
| CN107405881A (en) * | 2015-03-26 | 2017-11-28 | 杰富意钢铁株式会社 | Container resin-coated metal sheet |
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