CN113696576B - Double-screw four-layer co-extrusion PE (polyethylene) single-material packaging film and preparation method thereof - Google Patents

Double-screw four-layer co-extrusion PE (polyethylene) single-material packaging film and preparation method thereof Download PDF

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CN113696576B
CN113696576B CN202110668589.2A CN202110668589A CN113696576B CN 113696576 B CN113696576 B CN 113696576B CN 202110668589 A CN202110668589 A CN 202110668589A CN 113696576 B CN113696576 B CN 113696576B
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layer
density polyethylene
double
polyethylene resin
screw
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CN113696576A (en
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林文茂
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Guangdong Lihong New Material 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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/536—Hardness
    • 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
    • B32B2307/554—Wear resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

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  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The utility model provides a double screw four layers are crowded PE single material packaging film altogether which characterized in that: the resin is composed of four resin layers, and the structural expression is as follows: A/B/C/D, the proportion of each layer is 1:2:2:1, wherein A is a printing heat-resistant layer, B is a functional core layer, C is a functional core layer, and D is a low-temperature heat-sealing layer. The preparation method of the double-screw four-layer co-extrusion PE single-material packaging film is characterized by comprising the following steps of: the double-screw four-layer co-extrusion PE single-material packaging film is prepared by a double-screw extruder four-layer co-extrusion casting processing method. Compared with the prior art, the invention has the beneficial effects that the four resin layers are respectively processed and produced by adopting an integrated polyethylene raw material and then are manufactured by adopting a double-screw extruder four-layer co-extrusion casting processing method, and the novel PE single-material packaging film which is simple and convenient to recycle, high in recycling value, low in energy consumption and cost in the production process, wide in product applicability and easy to popularize is provided.

Description

Double-screw four-layer co-extrusion PE (polyethylene) single-material packaging film and preparation method thereof
Technical Field
The invention relates to a packaging film, in particular to a double-screw four-layer co-extrusion packaging film and a preparation method thereof.
Background
At present, the multilayer composite plastic package is generally used, and is basically formed by compounding films made of various different materials, such as PA/PE, BOPP/VMPET/PE, VMPET/CPP, PET/AL/PE and other structures, but the recycling treatment of the films after use is very troublesome. The used plastic package treatment approaches comprise incineration power generation treatment, recycling, separation and reuse and degradation. However, secondary pollution exists in incineration power generation treatment, the utilization rate is low, and the air quality is seriously influenced; the separation technology treatment costs a great amount of economic cost, the treatment effect is not satisfactory, and the quality of the product is not stable when the product is reused; the problems faced by using degradable technology are: how to grasp the dimension of the degradable and packaging protection functions, namely how to solve the barrier property and the degradation timeliness of the packaging and the problem of the degraded micro-plastic which needs to be solved.
The plastic packaging industry is making innovation from the aspects of materials, process design and the like, and the single material design beneficial to recycling becomes an important trend of sustainable development in the field of plastic packaging, so that the sustainable development of materials can be better realized.
Disclosure of Invention
The first purpose of the invention is to provide a double-screw four-layer co-extrusion packaging film which can be recycled after being discarded. The technical scheme is as follows:
the utility model provides a double screw four layers are crowded PE single material packaging film altogether which characterized in that: the resin is composed of four resin layers, and the structural expression is as follows: A/B/C/D, the weight ratio of each layer is 1:2:2:1, wherein A is a printing heat-resistant layer, B is a functional core layer, C is a functional core layer, and D is a low-temperature heat-sealing layer.
Preferably, the printing heat-resistant layer of the layer A is made of 100% of high-density polyethylene resin; wherein the high density polyethylene resin has a density of 0.96g/cm 3 The melting point was 133 ℃.
Preferably, the functional core layer of the layer B consists of 40 percent of medium density polyethylene resin and 60 percent of metallocene linear low density polyethylene resin; wherein the medium density polyethylene resin has a density of 0.94g/cm 3 The melting point is 126 ℃; wherein the metallocene linear low-density polyethylene resin has a density of 0.912g/cm 3 The melting point is 110 ℃.
Preferably, the functional core layer of the layer C is made of 100% metallocene linear low density polyethylene resin; wherein the metallocene linear low density polyethylene resin has a density of 0.912g/cm 3 The melting point is 110 ℃.
Preferably, the low-temperature heat-sealing layer of the layer D consists of 15 percent of linear low-density polyethylene resin, 35 percent of metallocene linear low-density polyethylene resin, 48 percent of low-density polyethylene resin and 2 percent of opening agent; wherein the linear low density polyethylene resin has a density of 0.903g/cm 3 The melting point is 98 ℃; wherein the metallocene linear low-density polyethylene resin has a density of 0.912g/cm 3 The melting point is 110 ℃; wherein the low density polyethylene resin has a density of 0.92g/cm 3 The melting point is 111 ℃; wherein the density of the opening agent is 0.94g/cm 3 。
The invention aims at providing a preparation method of the double-screw four-layer co-extrusion PE single-material packaging film, which adopts the following technical scheme:
the preparation method of the double-screw four-layer co-extrusion PE single-material packaging film is characterized by comprising the following steps of: the double-screw four-layer co-extrusion PE single-material packaging film is prepared by a double-screw extruder four-layer co-extrusion casting processing method.
In a preferred embodiment, the preparation method comprises the following steps:
(1) 100 parts by weight of high-density polyethylene resin raw materials are put into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 10-20rad/min;
(2) According to the weight parts, 80 parts of medium-density polyethylene resin and 120 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10-20rad/min;
(3) According to the weight parts, 200 parts of metallocene linear low-density polyethylene resin raw materials are put into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 10-20rad/min;
(4) According to the weight parts, 15 parts of linear low-density polyethylene resin, 35 parts of metallocene linear low-density polyethylene resin, 48 parts of low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10-20rad/min;
(5) And pressurizing and stabilizing the four groups of melts after melting and mixing by a double-screw extruder through a melt pump, and then casting by a plotter and a casting die head to prepare the finished film.
Compared with the prior art, the invention has the beneficial effects that the four resin layers are respectively processed and produced by adopting an integrated polyethylene raw material and then are manufactured by adopting a double-screw extruder four-layer co-extrusion casting processing method, and the novel PE single-material packaging film which is simple and convenient to recycle, high in recycling value, low in energy consumption and cost in the production process, wide in product applicability and easy to popularize is provided.
Drawings
FIG. 1 is a schematic sectional structure view of a double-screw four-layer co-extrusion PE barrier material packaging film of the invention.
Detailed Description
The present invention will be further described with reference to preferred embodiments thereof. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.
The utility model provides a double screw four layers are crowded single material packaging film of PE altogether, comprises four layers of resin layer, and its structural expression formula is: A/B/C/D, wherein A is a printing heat-resistant layer, B is a functional core layer, C is a functional core layer, D is a low-temperature heat-sealing layer, and the weight ratio of each layer is 1:2:2:1.
layer a (100 parts by weight): the printing heat-resistant layer is made of 100% of high-density polyethylene resin; wherein the high density polyethylene resin has a density of 0.96g/cm 3 The melting point is 133 ℃;
layer B (200 parts by weight): the functional core layer is composed of 40% of medium density polyethylene resin and 60% of metallocene linear low density polyethylene resin; wherein the medium density polyethylene resin has a density of 0.94g/cm 3 The melting point is 126 ℃; wherein the metallocene linear low-density polyethylene resin has a density of 0.912g/cm 3 The melting point is 110 ℃;
layer C (200 parts by weight): the functional core layer is made of 100% metallocene linear low density polyethylene resin; wherein the metallocene linear low-density polyethylene resin has a density of 0.912g/cm 3 Having a melting point of110℃；
Layer D (100 parts by weight): the low-temperature heat sealing layer consists of 15 percent of linear low-density polyethylene resin, 35 percent of metallocene linear low-density polyethylene resin, 48 percent of low-density polyethylene resin and 2 percent of opening agent; wherein the linear low density polyethylene resin has a density of 0.903g/cm 3 The melting point is 98 ℃; wherein the metallocene linear low density polyethylene resin has a density of 0.912g/cm 3 The melting point is 110 ℃; wherein the low density polyethylene resin has a density of 0.92g/cm 3 The melting point is 111 ℃; wherein the density of the opening agent is 0.94g/cm 3 。
The layer A is made of high-density polyethylene resin with the melting point of 133 ℃, so that the layer A has higher heat resistance temperature and also has better surface hardness, tensile strength and wear resistance. The layer B is formed by mixing 40% of medium density polyethylene and 60% of metallocene linear low density polyethylene, so that the welding wire has good weldability and environmental stress cracking resistance of the medium density polyethylene, and also has high strength and high toughness of the metallocene linear low density polyethylene. The layer C is made of metallocene linear low-density polyethylene resin with the melting point of 110 ℃, so that the heat sealing temperature is effectively reduced, and the impact strength is greatly improved. The layer D is composed of 15% of linear low-density polyethylene resin, 35% of metallocene linear low-density polyethylene resin, 48% of low-density polyethylene resin and 2% of an opening agent; the combination of three low-melting polyethylene resins, namely the linear low-density polyethylene resin with the melting point of 98 ℃, the metallocene linear low-density polyethylene resin with the melting point of 110 ℃ and the low-density polyethylene resin with the melting point of 111 ℃, ensures that the low-temperature sealing polyethylene has the characteristics of low-temperature sealing and high heat sealing strength, and has the impact strength of the metallocene linear low-density polyethylene and the good flexibility and extensibility of the low-density polyethylene.
The raw materials in the A, B, C, D four layers are well plasticized through the good mixing and plasticizing performance of the twin-screw, various characteristics of the raw materials are optimally exerted and are fused with each other, and then the raw materials are unified into a whole through a four-layer co-extrusion process. Therefore, the finally produced product has good surface heat resistance, surface hardness and tensile strength and sufficient flexibility, extensibility and high toughness, and the bottom heat-sealing layer has the characteristics of low-temperature seal initiation and high heat-sealing strength. Compared with the traditional PE film, the bag making performance is realized, when the traditional PE film is used for making bags, the PE film can be adhered to a sealing knife when the heat sealing temperature is high, and the PE film cannot be successfully heat-sealed when the heat sealing temperature is low; the PE film can not achieve effective heat sealing strength at a proper heat sealing temperature; therefore, the conventional PE film needs to be compounded, and other high-temperature resistant plastic films are compounded on the PE film. When the PE single-material packaging film produced by the double-screw four-layer co-extrusion process is used for making a bag by a bag making machine, low-temperature sealing can be realized at a lower heat sealing temperature, the heat sealing strength is high enough, and the mechanical performance requirement after bag making is met. Meanwhile, as the packaging film is made of a PE single material, the packaging film can be subjected to secondary processing and utilization only by simple crushing, cleaning, filtering and drying during recovery, and does not need to be added with a chemical separating agent or physically separated. Compared with MDOPE or BOPP, the cost of the production equipment is lower, and the MDOPE or BOPE also needs to be subjected to composite heat-sealing layers or coating heat-sealing layers.
Example 1
The specific processing method of this example is as follows:
1. according to the weight portion, 100 portions of high-density polyethylene resin raw materials are put into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 210 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 15rad/min;
2. according to the weight parts, 80 parts of medium-density polyethylene resin and 120 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 200 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 13rad/min;
3. according to the weight portion, 200 portions of metallocene linear low density polyethylene resin raw material are put into a bin of a double-screw extruder, the processing temperature of the extruder is set at 195 ℃, and the screw rotating speed of the double-screw extruder is controlled at 16rad/min;
4. according to the weight parts, 15 parts of linear low-density polyethylene resin, 35 parts of metallocene linear low-density polyethylene resin, 48 parts of low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 200 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 15rad/min;
5. and pressurizing and stabilizing the four groups of melts after melting and mixing by a double-screw extruder through a melt pump, and then casting by a distributor and a casting die head to prepare the finished film.
Example 2
The specific processing method of this example is as follows:
1. according to the weight portion, 100 portions of high-density polyethylene resin raw materials are put into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 220 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 10rad/min;
2. taking 80 parts by weight of medium-density polyethylene resin and 120 parts by weight of metallocene linear low-density resin, putting into stirring equipment, setting the stirring time until the materials are uniformly stirred, pouring the uniformly stirred materials into a bin of a double-screw extruder, setting the processing temperature of the extruder at 210 ℃, and controlling the screw rotating speed of the double-screw extruder at 10rad/min;
3. according to the weight portion, 200 portions of metallocene linear low density polyethylene resin raw materials are put into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 210 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 10rad/min;
4. according to the weight parts, 15 parts of linear low-density polyethylene resin, 35 parts of metallocene linear low-density polyethylene resin, 48 parts of low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 210 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10rad/min;
5. and pressurizing and stabilizing the four groups of melts after melting and mixing by a double-screw extruder through a melt pump, and then casting by a distributor and a casting die head to prepare the finished film.
Example 3
The specific processing method of this example is as follows:
1. 100 parts by weight of high-density polyethylene resin raw materials are put into a bin of a double-screw extruder, the processing temperature of the extruder is set to 235 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 20rad/min;
2. according to the weight parts, 80 parts of medium-density polyethylene resin and 120 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 20rad/min;
3. according to the weight portion, 200 portions of metallocene linear low density polyethylene resin raw materials are put into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 235 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 20rad/min;
4. according to the weight parts, 15 parts of linear low-density polyethylene resin, 35 parts of metallocene linear low-density polyethylene resin, 48 parts of low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred raw materials are poured into a bin of a double-screw extruder, the processing temperature of the extruder is set to 235 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 20rad/min;
5. pressurizing and stabilizing the four groups of melts after melting and mixing through a double-screw extruder by a melt pump, and then casting by a distributor and a casting die head to prepare a finished film.
The PE single-material packaging film obtained by the preparation method has higher heat resistance at the outer layer, so that various coatings do not need to be additionally coated or a heat-insulating cushion layer does not need to be added, and a bag can be made by using a lower heat-sealing temperature on a bag making machine; the common PE film can be used for bag making only by additionally coating a heat insulation material or carrying out a composite heat insulation layer. Meanwhile, because the heat sealing layer of the PE single-material packaging film has the characteristic of ultra-low temperature sealing, the sealing knife temperature of a bag making machine during processing can be 130-140 ℃ to be made into a self-standing bag, a zipper bag and the like, and the heat sealing strength can reach 30-38kN/m; the common PE film needs higher heat sealing temperature to be unsealed, the common PE film can be effectively unsealed only when the temperature reaches over 160 ℃, and the heat sealing strength is only 19-22kN/m. Therefore, the PE single-material packaging film prepared by the formula has obvious advantages in recycling and reusing, and also has great advantages in energy saving.
Figure BDA0003118256200000081
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and the equivalent or simple change of the structure, the characteristics and the principle described in the present patent idea is included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (3)

1. The utility model provides a double-screw four layers are crowded PE single material packaging film altogether which characterized in that: the composite material is composed of four resin layers, and the structural expression is as follows: A/B/C/D, the weight ratio of each layer is 1:2:2:1, wherein A is a printing heat-resistant layer, B is a functional core layer, C is a functional core layer, and D is a low-temperature heat-sealing layer;
the printing heat-resistant layer of the layer A is made of 100% of high-density polyethylene resin; wherein the high density polyethylene resin has a density of 0.96g/cm 3 The melting point is 133 ℃;
the functional core layer of the layer B consists of 40 percent of medium density polyethylene resin and 60 percent of metallocene linear low density polyethylene resin; wherein the medium density polyethylene resin has a density of 0.94g/cm 3 The melting point is 126 ℃; wherein the metallocene linear low-density polyethylene resin has a density of 0.912g/cm 3 The melting point is 110 ℃;
the functional core layer of the layer C is made of 100% metallocene linear low density polyethylene resin; wherein the content of the first and second substances,the metallocene linear low-density polyethylene resin has the density of 0.912g/cm 3 The melting point is 110 ℃;
the low-temperature heat sealing layer of the layer D consists of 15% of linear low-density polyethylene resin, 35% of metallocene linear low-density polyethylene resin, 48% of low-density polyethylene resin and 2% of an opening agent; wherein the linear low density polyethylene resin has a density of 0.903g/cm 3 The melting point is 98 ℃; wherein the metallocene linear low-density polyethylene resin has a density of 0.912g/cm 3 The melting point is 110 ℃; wherein the low density polyethylene resin has a density of 0.92g/cm 3 The melting point is 111 ℃; wherein the density of the opening agent is 0.94g/cm 3 。
2. The method for preparing the double-screw four-layer co-extrusion PE single-material packaging film according to claim 1, which is characterized in that: the double-screw four-layer co-extrusion PE single-material packaging film is prepared by a double-screw extruder four-layer co-extrusion casting processing method.
3. The method for preparing the double-screw four-layer co-extrusion PE single-material packaging film as claimed in claim 1 or 2, which is characterized in that: the preparation method comprises the following steps:
(1) According to the weight portion, 100 portions of high-density polyethylene resin raw materials are put into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 10-20rad/min;
(2) According to the weight parts, 80 parts of medium-density polyethylene resin and 120 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10-20rad/min;
(3) According to the weight parts, 200 parts of metallocene linear low-density polyethylene resin raw materials are put into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 10-20rad/min;
(4) According to the weight parts, 15 parts of linear low-density polyethylene resin, 35 parts of metallocene linear low-density polyethylene resin, 48 parts of low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190-235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10-20rad/min;
(5) Pressurizing and stabilizing the four groups of melts after melting and mixing through a double-screw extruder by a melt pump, and then casting by a distributor and a casting die head to prepare a finished film.
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