CN111483203A - High-barrier packaging film with self-adhesion function and preparation method thereof - Google Patents

High-barrier packaging film with self-adhesion function and preparation method thereof Download PDF

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Publication number
CN111483203A
CN111483203A CN202010315037.9A CN202010315037A CN111483203A CN 111483203 A CN111483203 A CN 111483203A CN 202010315037 A CN202010315037 A CN 202010315037A CN 111483203 A CN111483203 A CN 111483203A
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layer
packaging film
self
polyethylene
barrier packaging
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谢德
黄本朴
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Zhuhai Xutai Daily Necessities Co ltd
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Zhuhai Xutai Daily Necessities 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—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
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • 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
    • C08J2351/00—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
    • C08J2351/08—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 macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • 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
    • 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
    • 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
    • C08J2423/08—Copolymers of ethene
    • 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
    • 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
    • C08J2451/08—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 macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

Abstract

The invention provides a high-barrier packaging film with a self-adhesion function, which comprises a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and co-extruded, wherein the polyethylene layer accounts for 55-65% of the packaging film in percentage by mass; the proportion of the bonding resin layer is 18-26%; the proportion of the nylon layer is 16-20%; wherein the polyethylene layer comprises 24-36% of polymer polyol by mass percent. The high-barrier packaging film with the self-adhesion function provided by the invention has high barrier and high self-adhesion, has a long-time airtight effect, does not need to be replaced for many times, and saves manpower and material resources. The invention also provides a preparation method of the high-barrier packaging film with the self-adhesion function, and the co-extrusion blown film is formed in one step and has a simple process.

Description

High-barrier packaging film with self-adhesion function and preparation method thereof
Technical Field
The invention relates to the field of multilayer co-extrusion packaging films, in particular to a high-barrier packaging film with a self-adhesion function and a preparation method thereof.
Background
The self-adhesive film is a soft film with high transparency and elasticity. The novel packaging material is prepared by using polyethylene as a main raw material, melting and plasticizing the polyethylene by an extrusion system, and then performing single-layer, double-layer or three-layer coextrusion casting process by a machine head and a forming die. The PE self-adhesive film has the characteristics of good longitudinal and transverse two-way cold stretching, has larger retractility and lasting binding force, is mainly used for tray type transportation and packaging, the bundling and packaging of large or various known scattered articles, the food refrigeration and packaging of families and supermarkets and the transportation and packaging of products such as household appliances, precision instruments, bicycles, motorcycles, high-grade furniture and the like by depending on the viscosity of the PE self-adhesive film. However, the existing three-layer co-extrusion film is poor in air tightness, the air tightness is long for about one month, and the article needing to be sealed for a longer time needs to be frequently replaced, so that the cost of manpower and material resources is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the high-barrier packaging film with the self-adhesion function, which has high barrier and high self-adhesion, has a long-time airtight effect, does not need to be replaced for many times, and saves manpower and material resources.
The invention provides a high-barrier packaging film with self-adhesion function, which comprises a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and co-extruded,
according to the mass percentage of the packaging film, the polyethylene layer accounts for 55-65%;
the proportion of the bonding resin layer is 18-26%;
the proportion of the nylon layer is 16-20%;
wherein the polyethylene layer comprises 24-36% of polymer polyol by mass percent.
In a preferred embodiment of the present invention, the polymer polyol is a vinyl polymer graft polyether polyol, and is obtained by radical graft polymerization of a polyether polyol as a base polyether, with addition of a vinyl monomer and an initiator.
As a preferable scheme of the invention, the vinyl monomer comprises one or more of acrylonitrile, styrene, methyl methacrylate, vinyl acetate and vinyl chloride.
In a preferred embodiment of the present invention, the polyethylene layer further comprises, by mass, 18 to 22% of low density polyethylene, 18 to 22% of linear low density polyethylene, and 28 to 32% of metallocene linear polyethylene.
In a preferred embodiment of the present invention, the binder resin is an ethylene acrylic acid resin.
The invention also provides a preparation method of the high-barrier packaging film with the self-adhesion function, which comprises the following steps:
s1 preparation of polyethylene layer raw material
The polymer polyol and the polyethylene particles are fed into a first screw extruder according to the formula amount, the screw temperature of the first screw extruder is 198-210 ℃, the rotating speed is 35r/min, the extrusion pressure is 26MPa, and the extrusion temperature is 210 ℃.
S2 preparation of raw material for adhesive resin layer
The adhesive resin particles are fed into a second screw extruder according to the formula amount, the screw temperature of the second screw extruder is 200-245 ℃, the rotating speed is 30r/min, the extrusion pressure is 28MPa, and the extrusion temperature is 245 ℃.
S3 preparation of nylon layer raw material
The nylon particles are added into a third screw extruder according to the formula amount, the screw temperature of the third screw extruder is 230-245 ℃, the rotating speed is 20r/min, the extrusion pressure is 16MPa, and the extrusion temperature is 245 ℃.
S4, extrusion Molding
And simultaneously conveying the raw materials of the polyethylene layer, the adhesive resin layer and the nylon layer to a machine head of a three-layer co-extruder, and co-extruding and film blowing to form the three raw materials in a molten state, wherein the thickness of the co-extruded film is 0.03-0.06 mm.
The invention has the beneficial effects that:
the invention has high barrier property through compounding of various types of polyethylene, and simultaneously, the co-extrusion film has high elasticity and excellent self-adhesion effect through adding the polymer polyol (POP) into the polyethylene layer, thereby solving the problems of poor tear resistance and poor self-adhesion effect of the co-extrusion high barrier material as a self-adhesion material. The high autohension makes the crowded membrane have long-time airtight effect, need not to change the packaging film frequently because of airtight time limit to reduce cost and reduce human input.
The packaging film disclosed by the invention has the advantages of high barrier property, high self-adhesion, higher tensile strength, tearing strength, good puncture resistance, firm welding, easiness in processing and packaging, overlong airtight time and the like, and can completely replace other similar low-efficiency airtight materials.
Detailed Description
The scheme of the application is further described below with reference to specific examples:
example 1
A high-barrier packaging film with a self-adhesion function comprises a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and co-extruded. According to the mass percent of the packaging film, the polyethylene layer accounts for 60 percent, and the adhesive resin layer accounts for 22 percent. The proportion of the nylon layer is 18%.
Wherein, the polyethylene layer comprises 20 percent of low density polyethylene, 20 percent of linear polyethylene, 30 percent of metallocene linear polyethylene and 30 percent of polymer polyol by mass percent.
The polymer polyol is vinyl polymer graft polyether polyol, and is prepared by taking polyether polyol as basic polyether, adding a vinyl monomer and an initiator, and carrying out free radical graft polymerization at 100 ℃ under the protection of nitrogen. The vinyl monomer comprises one or more of acrylonitrile, styrene, methyl methacrylate, vinyl acetate and vinyl chloride. The polymer polyol of this example was prepared from a POP of 1140G Dow company.
The adhesive resin is ethylene acrylic resin, specifically 41E687 of Dupont Bay.
Example 2
A high-barrier packaging film with a self-adhesion function comprises a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and co-extruded. According to the mass percentage of the packaging film, the polyethylene layer accounts for 56%, and the bonding resin layer accounts for 23%. The proportion of the nylon layer is 21%.
Wherein, the polyethylene layer comprises 18 percent of low density polyethylene, 18 percent of linear polyethylene, 28 percent of metallocene linear polyethylene and 36 percent of polymer polyol by mass percent.
The polymer polyol is vinyl polymer graft polyether polyol, and is prepared by taking polyether polyol as basic polyether, adding a vinyl monomer and an initiator, and carrying out free radical graft polymerization at 100 ℃ under the protection of nitrogen. The vinyl monomer comprises one or more of acrylonitrile, styrene, methyl methacrylate, vinyl acetate and vinyl chloride. The polymer polyol of this example was prepared from a POP of 1140G Dow company.
The adhesive resin is ethylene acrylic resin, specifically 41E687 of Dupont Bay.
Example 3
A high-barrier packaging film with a self-adhesion function comprises a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and co-extruded. According to the mass percent of the packaging film, the polyethylene layer accounts for 63%, and the adhesive resin layer accounts for 20%. The nylon layer accounts for 17%.
Wherein, the polyethylene layer comprises 22 percent of low density polyethylene, 22 percent of linear polyethylene, 32 percent of metallocene linear polyethylene and 24 percent of polymer polyol by mass percent.
The polymer polyol is vinyl polymer graft polyether polyol, and is prepared by taking polyether polyol as basic polyether, adding a vinyl monomer and an initiator, and carrying out free radical graft polymerization at 100 ℃ under the protection of nitrogen. The vinyl monomer comprises one or more of acrylonitrile, styrene, methyl methacrylate, vinyl acetate and vinyl chloride. The polymer polyol of this example was prepared from a POP of 1140G Dow company.
The adhesive resin is ethylene acrylic resin, specifically 41E687 of Dupont Bay.
Example 4
A method of making the high barrier packaging film of embodiments 1-3 with self-adhesive function comprising the steps of:
s1 preparation of polyethylene layer raw material
The polymer polyol and the polyethylene particles are fed into a first screw extruder according to the formula amount, the screw temperature of the first screw extruder is 198-210 ℃, the rotating speed is 35r/min, the extrusion pressure is 26MPa, and the extrusion temperature is 210 ℃.
S2 preparation of raw material for adhesive resin layer
The adhesive resin particles are fed into a second screw extruder according to the formula amount, the screw temperature of the second screw extruder is 200-245 ℃, the rotating speed is 30r/min, the extrusion pressure is 28MPa, and the extrusion temperature is 245 ℃.
S3 preparation of nylon layer raw material
The nylon particles are added into a third screw extruder according to the formula amount, the screw temperature of the third screw extruder is 230-245 ℃, the rotating speed is 20r/min, the extrusion pressure is 16MPa, and the extrusion temperature is 245 ℃.
S4, extrusion Molding
And simultaneously conveying the raw materials of the polyethylene layer, the adhesive resin layer and the nylon layer to the head of a three-layer co-extruder, and co-extruding and film-blowing the three raw materials in a molten state to form the three-layer co-extruded film, wherein the thickness of the co-extruded film is 0.04 mm.
Comparative example 1
A co-extrusion packaging film comprises a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and co-extruded. According to the mass percent of the packaging film, the polyethylene layer accounts for 60 percent, and the adhesive resin layer accounts for 22 percent. The proportion of the nylon layer is 18%.
The polyethylene layer comprises, by mass, 35% of low-density polyethylene, 30% of linear polyethylene and 35% of metallocene linear polyethylene.
Comparative example 2
A co-extrusion packaging film comprises a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and co-extruded. According to the mass percent of the packaging film, the polyethylene layer accounts for 40 percent, and the bonding resin layer accounts for 25 percent. The proportion of the nylon layer is 35%.
The polyethylene layer comprises 20% of low density polyethylene, 20% of linear polyethylene, 30% of metallocene linear polyethylene and 30% of polymer polyol by mass percent.
The coextruded film thickness of 0.04mm was prepared according to the preparation method of example 4 for examples 1-3 and comparative examples 1-2, and the following property tests were carried out:
first, self-adhesive adsorption test.
Cutting 400mm 70mm strip packaging film, allowing two strips of packaging film to hang freely, starting from 300mm apart, slowly moving toward each other, and allowing absorption reaction when the distance is 100 mm.
And II, tear resistance testing.
After the packaging film is heated and welded, the packaging film is not required to be torn or delaminated when being subjected to 20N opposite external force.
Third, test results
Figure BDA0002459115590000061
Figure BDA0002459115590000071
According to the test results, the co-extruded film has high elasticity, excellent self-adhesion effect and good tear resistance by compounding various types of polyethylene and polymer polyol (POP). And the proportion of the polyethylene layer also has an influence on the performance of the packaging film.
The above preferred embodiments should be considered as examples of the embodiments of the present application, and technical deductions, substitutions, improvements and the like similar to, similar to or based on the embodiments of the present application should be considered as the protection scope of the present patent.

Claims (6)

1. A high-barrier packaging film with self-adhesion function is characterized by comprising a polyethylene layer, an adhesive resin layer and a nylon layer which are sequentially attached and coextruded, wherein according to the mass percentage of the packaging film,
the proportion of the polyethylene layer is 55-65%;
the proportion of the bonding resin layer is 18-26%;
the proportion of the nylon layer is 16-20%;
wherein the polyethylene layer comprises 24-36% of polymer polyol by mass percent.
2. The high barrier packaging film with self-adhesive function according to claim 1, wherein the polymer polyol is a vinyl polymer graft polyether polyol, which is obtained by radical graft polymerization of a polyether polyol as a base polyether, with a vinyl monomer and an initiator.
3. The high barrier packaging film with self-adhesive function according to claim 2, wherein the vinyl monomer comprises one or more of acrylonitrile, styrene, methyl methacrylate, vinyl acetate, vinyl chloride.
4. The high barrier packaging film with self-adhesive function according to claim 1, 2 or 3, wherein the polyethylene layer further comprises 18-22% by mass of low density polyethylene, 18-22% by mass of linear low density polyethylene, and 28-32% by mass of metallocene linear polyethylene.
5. The high barrier packaging film with self-adhesive function according to claim 1, wherein the adhesive resin is an ethylene acrylic acid resin.
6. A process for the preparation of a high barrier packaging film with self-adhesive function according to any of claims 1 to 5, characterized in that it comprises the following steps:
s1 preparation of polyethylene layer raw material
Feeding polymer polyol and polyethylene particles into a first screw extruder according to the formula amount, wherein the screw temperature of the first screw extruder is 198-210 ℃, the rotating speed is 35r/min, the extrusion pressure is 26MPa, and the extrusion temperature is 210 ℃;
s2 preparation of raw material for adhesive resin layer
Feeding the adhesive resin particles into a second screw extruder according to the formula amount, wherein the screw temperature of the second screw extruder is 200-245 ℃, the rotating speed is 30r/min, the extrusion pressure is 28MPa, and the extrusion temperature is 245 ℃;
s3 preparation of nylon layer raw material
Feeding the nylon particles into a third screw extruder according to the formula amount, wherein the screw temperature of the third screw extruder is 230-245 ℃, the rotating speed is 20r/min, the extrusion pressure is 16MPa, and the extrusion temperature is 245 ℃;
s4, extrusion Molding
And simultaneously conveying the raw materials of the polyethylene layer, the adhesive resin layer and the nylon layer to a machine head of a three-layer co-extruder, and co-extruding and film blowing to form the three raw materials in a molten state, wherein the thickness of the co-extruded film is 0.03-0.06 mm.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112646387A (en) * 2020-12-21 2021-04-13 浙江大汇新材料有限公司 Inner film structure for packaging

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CN112646387B (en) * 2020-12-21 2023-02-17 浙江大汇新材料有限公司 Inner film structure for packaging

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