CN111421934A - Preparation method of puncture-resistant high-barrier co-extruded film - Google Patents

Preparation method of puncture-resistant high-barrier co-extruded film Download PDF

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CN111421934A
CN111421934A CN202010334989.5A CN202010334989A CN111421934A CN 111421934 A CN111421934 A CN 111421934A CN 202010334989 A CN202010334989 A CN 202010334989A CN 111421934 A CN111421934 A CN 111421934A
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puncture
layer
barrier
core layer
preparation
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张乐
孙恩军
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DALIAN JUTONG PLASTIC PRODUCTS CO LTD
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DALIAN JUTONG PLASTIC PRODUCTS 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
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • 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
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—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
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—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
    • C08J2323/06—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
    • 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
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/14—Copolymers of propene
    • 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
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • 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
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    • 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
    • C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond

Abstract

The invention provides a preparation method of a puncture-resistant high-barrier co-extruded film, relates to the technical field of packaging materials, and solves the technical problems that a PE film and a PP film in the prior art are low in puncture resistance, poor in stretching resistance and low temperature resistance, and bag breakage and poor sealing are easy to occur. The co-extrusion film comprises a composite layer, a first core layer, a second core layer and a heat sealing layer, and is formed by the four layers of the composite layer, the first core layer, the second core layer and the heat sealing layer which are arranged in sequence through blow molding and co-extrusion. The co-extruded film provided by the invention integrates a series of mechanical properties such as puncture resistance, tensile resistance, impact resistance, tear resistance and the like, and also meets the processing performance of products and the service performance of customers on the premise of ensuring the mechanical properties.

Description

Preparation method of puncture-resistant high-barrier co-extruded film
Technical Field
The invention relates to the technical field of packaging materials, in particular to a preparation method of an anti-puncture high-barrier co-extruded film.
Background
With the rapid rise of the soft package industry, the quality of the packaging material is required to be higher, and the traditional PE film and PP film can not meet the requirements of special customers.
The prior art has the following defects: (mainly aiming at the PE film and PP film which are widely applied at present)
1. The puncture resistance is low, and the package modes such as vacuum pumping and the like cause the content to puncture the membrane material, so that the conditions of air leakage and package breaking are caused;
2. the stretch-proof performance is low, and the method is mainly used for common heavy packaging and heavy packaging products;
3. the low temperature resistance is poor, the performance of the common PE film is greatly reduced in a low temperature environment, the film becomes brittle, and the mechanical properties such as stretching, impact resistance and the like are obviously reduced;
4. the sealing strength of the film is poor, and the raw material selection and raw material proportioning mode of the heat sealing layer of the film are improper, so that the sealing strength can not meet the requirements of customers;
5. the low-temperature heat sealing performance is poor, the unsealing temperature of the common PE film is high, and the requirements of customers on high speed and low temperature cannot be well met;
6. the heat sealing has poor pollution resistance, and the sealing is badly polluted by the contents in the packaging process of the dust and grease contents, so that the sealing is badly caused;
7. the film has higher haze and poor transparency, and because the cooling air temperature of the air ring of the PE film produced by the up-blowing method is higher and the environment is influenced, the film bubble is cooled unevenly, so that the film has higher crystallinity and uneven crystallization, and the haze and poor transparency of the film surface are caused;
8. the antistatic property of the film heat seal layer is poor, and if the content is dry powder and the like which contain charged particle substances, the content is easy to adsorb to the inner film surface;
9. the common film has poor barrier property to gas and water vapor, cannot meet customers with the requirement on barrier property, or needs to use a coating material in the processing process, or uses an aluminum foil or an aluminum-plated product for matching use, so that the cost is greatly increased, and the materials also have use limitation.
Therefore, aiming at the technical problems, the invention provides a preparation method of a puncture-resistant high-barrier functional co-extruded film.
Disclosure of Invention
The invention aims to provide a preparation method of a puncture-resistant high-barrier functional co-extruded film, which aims to solve the technical problems of low puncture resistance, poor tensile resistance, poor low-temperature resistance, easy bag breakage and poor sealing of PE films and PP films in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a preparation method of an anti-puncture high-barrier co-extrusion film, which comprises the following steps:
the method comprises the following steps: arranging the composite layer, the first core layer, the second core layer and the heat sealing layer in sequence;
step two: and carrying out blow molding co-extrusion on the composite layer, the first core layer, the second core layer and the heat sealing layer.
As a further improvement of the invention, the composite layer, the first core layer, the second core layer and the heat seal layer account for 9-10%, 39-40% and 9-10% by mass respectively.
As a further improvement of the invention, the composite layer is formed by mixing first metallocene polyethylene, a first metallocene polyethylene elastomer, linear low density polyethylene and first low density polyethylene.
As a further improvement of the present invention, the first metallocene polyethylene elastomer, the linear low density polyethylene, and the first low density polyethylene account for 50%, 20%, 10%, and 20% by mass, respectively.
As a further improvement of the invention, the first core layer is formed by mixing second metallocene polyethylene, random copolymerization polypropylene resin and second low density polyethylene.
In a further improvement of the present invention, the second metallocene polyethylene, the random copolymer polypropylene resin, and the second low-density polyethylene account for 40 mass%, 50 mass%, and 10 mass%, respectively.
As a further improvement of the invention, the second core layer is formed by mixing polyamide resin, metallocene polyethylene resin and polyethylene grafted maleic anhydride.
As a further improvement of the invention, the mass percentages of the polyamide resin, the metallocene polyethylene resin and the polyethylene grafted maleic anhydride are respectively 60%, 30% and 10%.
As a further improvement of the invention, the heat sealing layer is formed by mixing third metallocene polyethylene, a second metallocene polyethylene elastomer and third low-density polyethylene, and is smooth and anti-static to extrude.
As a further improvement of the invention, the third metallocene polyethylene, the second metallocene polyethylene elastomer, the third low-density polyethylene, the smooth extrusion and the antistatic extrusion account for 40%, 30%, 26%, 2% and 2% by mass respectively.
Compared with the prior art, the invention has the following beneficial effects:
the co-extrusion film provided by the invention is formed by blow molding and co-extrusion of the four layers of the composite layer, the first core layer, the second core layer and the heat sealing layer which are sequentially arranged, integrates a series of mechanical properties such as puncture resistance, tensile resistance, impact resistance, tear resistance and the like, and meets the processing performance of products and the service performance of customers on the premise of ensuring the mechanical properties.
The preferred embodiment of the present invention also has the following advantageous effects:
1. the tensile property of the heavy packaging bag is solved: the transverse and longitudinal tensile strength of the film is improved, and the performance requirement of the packing material of the heavy packing bag can be solved to a great extent;
2. improve the puncture resistance of the membrane: under the conditions that the contents are hard and sharp objects and the processing process is vacuum pumping, the membrane material is required to have higher puncture resistance, so that the phenomena of bag breakage and air leakage are avoided;
3. the tear strength and the impact strength of the film are improved: the bag breaking rate of the product can be greatly reduced in the freight turnover process, the inventory stacking process and the transferring and falling process of the product;
4. the sealing strength, the low-temperature high-speed heat sealing performance and the pollution resistance of the sealing position of the material are improved: the conditions of poor sealing, dust, oil stain and the like frequently occur in the market, the poor sealing caused by poor pollution resistance of the film is caused, and in addition, the low-temperature high-speed heat sealing effect can improve the production efficiency of customers to a great extent and improve the yield;
5. the transparency of the film material is improved: the transparency of the film is improved, so that the product quality and the user experience can be improved;
6. improve the antistatic property of membrane heat seal layer: aiming at dust products, the antistatic property of the inner layer can reduce the content (product) from being adsorbed on the inner layer of the film due to static electricity;
7. the freezing resistance of the product is improved: mainly aiming at customers using in low temperature environment, the product can meet the requirement of using at about minus 30 ℃, and the performance of the film is basically not influenced;
8. the barrier property of the film is improved: mainly aiming at the customer requirements of gas resistance and water resistance, the product has stronger barrier property to gas and water vapor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a co-extruded film according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a film blowing machine according to a first embodiment of the present invention.
In the figure: 1. compounding layers; 2. a first core layer; 3. a second core layer; 4. a heat seal layer; 5. a first heating zone; 6. a second heating zone; 7. a third heating zone; 8. a fourth heating zone; 9. a fifth hot zone; 10. a sixth heating zone.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The traditional PE (PP) film has the phenomena of bag breaking, poor sealing, poor tensile property and the like frequently in the using process of customers, and the bag breaking condition is more serious under the conditions of heavy packaging or low-temperature environment or hard and sharp objects as contents, so that the customer complaints are continuous. The invention provides an anti-puncture high-barrier co-extruded film and a preparation method thereof, and the technical scheme provided by the invention is explained in more detail by combining figures 1-2.
As shown in fig. 1, the puncture-resistant high-barrier co-extruded film provided by the embodiment of the invention comprises a composite layer 1, a first core layer 2, a second core layer 3 and a heat-sealing layer 4, and the co-extruded film is formed by blow-molding and co-extruding the composite layer 1, the first core layer 2, the second core layer 3 and the heat-sealing layer 4 which are sequentially arranged.
The co-extrusion film provided by the embodiment of the invention is formed by blow molding and co-extrusion of four layers, namely a composite layer 1, a first core layer 2, a second core layer 3 and a heat sealing layer 4, which are sequentially arranged, integrates a series of mechanical properties such as puncture resistance, tensile resistance, impact resistance, tear resistance and the like, and meets the processing performance of products and the service performance of customers on the premise of ensuring the mechanical properties.
The preparation method of the puncture-resistant high-barrier co-extruded film provided by the embodiment of the invention comprises the following steps:
the method comprises the following steps: sequentially arranging the composite layer 1, the first core layer 2, the second core layer 3 and the heat sealing layer 4;
step two: and carrying out blow molding co-extrusion on the composite layer 1, the first core layer 2, the second core layer 3 and the heat sealing layer 4.
The first preferred material for preparing the co-extruded film in the embodiment of the invention is as follows:
metallocene polyethylene: melt index of 0.5-1.0g/10min, density of 0.91-0.925g/cm3(ii) a Metallocene polyethylene elastomer: melt index of 0.75-1.25g/10min, density of 0.901-0.906g/cm3(ii) a Polyamide resin: the density is 1.1-1.15g/cm3(ii) a Compatible extrusion: polyethylene grafted maleic anhydride; low density polyethylene: melt index of 0.25-1.0g/10min, density of 0.923-0.926g/cm3(ii) a Linear low density polyethylene: melt index of 1.0-2.0g/10min, density of 0.918g/cm3(ii) a Random polypropylene resin: melt index 24g/10min, density 0.90g/cm3(Exxonmol PP9074 brand raw material, but not limited to the brand raw material), smooth extrusion erucamide (Shanghai Schumann 705HF brand), and antistatic extrusion, which is a mobile compound (Shanghai Schumann V L A55 brand).
Further, the composite layer 1, the first core layer 2, the second core layer 3 and the heat seal layer 4 account for 9-10%, 39-40% and 9-10% by mass respectively.
As an alternative embodiment, the composite layer 1 is formed by mixing a first metallocene polyethylene, a first metallocene polyethylene elastomer, a linear low density polyethylene, and a first low density polyethylene.
Further, the first metallocene polyethylene elastomer, the linear low density polyethylene and the first low density polyethylene account for 50% by mass, 20% by mass, 10% by mass and 20% by mass, respectively. The composite layer 1 mainly improves the composite performance of the product structurally, and due to the introduction of the first metallocene polyethylene elastomer, the composite layer has a function of improving the flexibility of the film and has an obvious function in the aspect of the cold resistance of the material.
In an alternative embodiment, the first core layer 2 is formed by mixing the second metallocene polyethylene, the random copolymer polypropylene resin and the second low-density polyethylene.
Further, the second metallocene polyethylene, the random copolymerization polypropylene resin and the second low-density polyethylene account for 40 percent, 50 percent and 10 percent by mass respectively. The first core layer 2 has the advantages that due to the introduction of the random copolymerization polypropylene resin, the mechanical property of the film is greatly improved, the tensile strength, the tear strength and the like can be greatly improved, and the layer is mainly a mechanical property functional layer.
As an alternative embodiment, the second core layer 3 is formed by mixing polyamide resin, metallocene polyethylene resin and polyethylene grafted maleic anhydride.
Further, the polyamide resin, the metallocene polyethylene resin and the polyethylene grafted maleic anhydride respectively account for 60 percent, 30 percent and 10 percent by mass. Due to the introduction of the polyamide resin and the metallocene polyethylene resin, the second core layer 3 also increases the barrier property of the film on the premise of increasing the mechanical property, and the layer is mainly a functional layer with mechanical property and barrier property.
As an alternative embodiment, the heat-sealing layer 4 is formed by mixing third metallocene polyethylene, second metallocene polyethylene elastomer and third low-density polyethylene, and is smooth and anti-static.
Further, the third metallocene polyethylene, the second metallocene polyethylene elastomer, the third low-density polyethylene, the smooth extrusion and the antistatic extrusion account for 40%, 30%, 26%, 2% and 2% by mass respectively. The heat-sealing layer 4 can effectively reduce the seal-starting temperature, the heat-sealing temperature, the toughness of the film and the antistatic performance of the heat-sealing layer due to the introduction of the second metallocene polyethylene elastomer and the migration type antistatic extrusion, and the heat-sealing layer is mainly a heat-sealing functional layer.
Description of the process parameters of example one:
referring to table 1, the screw temperature setting zones between the layers mainly include a first heating zone 5, a second heating zone 6, a third heating zone 7, a fourth heating zone 8, a fifth heating zone 9, and a sixth heating zone 10, as shown in fig. 2.
TABLE 1
Between layers Temperature of one zone C Temperature of zone two deg.C Three zone temperatures deg.C Temperature of four zones Temperature of five zones Six zone temperatures deg.C
Composite layer 165-170 170-180 180-200 180-200 180-185 180-185
First core layer 180-185 180-185 190-200 200-210 190-200 180-185
Second core layer 195-200 220-230 230-240 230-240 200-210 200-210
Heat-sealing layer 165-170 170-180 180-200 180-200 180-185 180-185
Please refer to table 2 for blow molder die temperature settings:
TABLE 2
Temperature of one zone C Temperature of zone two deg.C Three zone temperatures deg.C
165-170 175-180 180-185
It should be noted that, in the preferred embodiment, the blow-up ratio can be set in the range of 2.5-3.0; the bubble frost line is kept within 5-10cm, preferably not more than 10cm, from the die outlet; the die head of the film blowing machine adopts an internal and external double-cooling system, the temperature of cooling air is ensured to be constant within the range of 20-25 ℃, the crystallinity of the film is reduced by a rapid cooling mode, and the optical performance of the film is improved.
The performance test data of the finished product film obtained by the preparation method provided by the invention are as follows:
referring to table 3, the experimental data shows that the film thickness is referenced to 100um film:
TABLE 3
Figure BDA0002466249010000071
Compared with the PE film or CPP film with the same thickness in the current market, the following beneficial technical effects are obtained through performance comparison:
firstly, puncture force: the puncture force of a common membrane in the market can only reach a value of 5-6N at present, and the puncture force value of the product can reach about 10-11N;
II, tensile strength: the tensile strength of similar products on the market is about 30Mpa, the tensile strength of the product can reach about 60Mpa, and the performance can be basically improved by one time;
thirdly, breaking force: the limit value of the breaking force of the similar products on the market can reach about 40N, and the breaking force of the product can reach about 70N;
fourthly, heat seal strength: the heat sealing strength of similar products on the market can reach 8N/110 ℃, and the heat sealing strength of the product can reach 18N/90 ℃;
fifthly, low-temperature heat sealability: the heat sealing temperature of similar products in the market is 110-120 ℃, and the product can meet the low-temperature heat sealing performance of 90-95 ℃;
sixthly, impact strength is improved; the impact strength of the product on the market is about 1.5J, the impact resistance of the product is higher by about 2.8J, and the film is not broken down in the experimental process;
seventhly, barrier property: please refer to table 4
TABLE 4
Figure BDA0002466249010000081
The water vapor transmission rate of similar products on the market is about 8-9, the oxygen transmission rate is more than 2000, the water vapor transmission rate of the product is about 3, and the oxygen transmission rate is less than 5;
the haze of the like products on the market is more than 10 (particularly blow molding products), the haze of the products can reach 5-7%, and the glossiness is higher.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connection (such as riveting and welding), of course, the mutual fixed connection can also be an integral structure (for example, the mutual fixed connection is manufactured by casting and integral forming instead (except that the integral forming process can not be adopted obviously).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (10)

1. The preparation method of the puncture-resistant high-barrier co-extruded film is characterized by comprising the following steps of:
the method comprises the following steps: sequentially arranging the composite layer (1), the first core layer (2), the second core layer (3) and the heat sealing layer (4);
step two: and carrying out blow molding co-extrusion on the composite layer (1), the first core layer (2), the second core layer (3) and the heat sealing layer (4).
2. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 1, characterized in that: the composite layer (1), the first core layer (2), the second core layer (3) and the heat seal layer (4) account for 9-10%, 39-40% and 9-10% by mass respectively.
3. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 2, characterized in that: the composite layer (1) is formed by mixing first metallocene polyethylene, a first metallocene polyethylene elastomer, linear low-density polyethylene and first low-density polyethylene.
4. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 3, wherein the method comprises the following steps: the first metallocene polyethylene, the first metallocene polyethylene elastomer, the linear low-density polyethylene and the first low-density polyethylene respectively account for 50 percent, 20 percent, 10 percent and 20 percent by mass.
5. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 2, characterized in that: the first core layer (2) is formed by mixing second metallocene polyethylene, random copolymerization polypropylene resin and second low-density polyethylene.
6. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 5, characterized in that: the second metallocene polyethylene, the random copolymerization polypropylene resin and the second low-density polyethylene respectively account for 40 percent, 50 percent and 10 percent by mass.
7. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 2, characterized in that: the second core layer (3) is formed by mixing polyamide resin, metallocene polyethylene resin and polyethylene grafted maleic anhydride.
8. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 7, characterized in that: the polyamide resin, the metallocene polyethylene resin and the polyethylene grafted maleic anhydride respectively account for 60 percent, 30 percent and 10 percent by mass.
9. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 2, characterized in that: the heat sealing layer (4) is formed by mixing third metallocene polyethylene, a second metallocene polyethylene elastomer, third low-density polyethylene, smooth extrusion and antistatic extrusion.
10. The preparation method of the puncture-resistant high-barrier co-extruded film according to claim 9, wherein the method comprises the following steps: the third metallocene polyethylene, the second metallocene polyethylene elastomer, the third low-density polyethylene, the smooth extrusion and the antistatic extrusion account for 40%, 30%, 26%, 2% and 2% by mass respectively.
CN202010334989.5A 2020-04-24 2020-04-24 Preparation method of puncture-resistant high-barrier co-extruded film Pending CN111421934A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112140676A (en) * 2020-09-25 2020-12-29 江西和烁丰新材料有限公司 Low-cost polyolefin synthetic paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112140676A (en) * 2020-09-25 2020-12-29 江西和烁丰新材料有限公司 Low-cost polyolefin synthetic paper

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