CN113246569B - Polyethylene label film and preparation method and application thereof - Google Patents

Polyethylene label film and preparation method and application thereof Download PDF

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CN113246569B
CN113246569B CN202110543937.3A CN202110543937A CN113246569B CN 113246569 B CN113246569 B CN 113246569B CN 202110543937 A CN202110543937 A CN 202110543937A CN 113246569 B CN113246569 B CN 113246569B
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polyethylene
label film
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CN113246569A (en
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朱业玲
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Shanghai Zijiang Colour Printing & Packaging 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
    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0223—Forms or constructions recyclable
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0257—Multilayer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

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  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention provides a polyethylene label film and a preparation method and application thereof, wherein the label film sequentially comprises an outer layer, an intermediate layer and an inner layer from top to bottom, the thickness of the label film is 75-85 mu m, and the layer thickness ratio of the outer layer to the intermediate layer to the inner layer is 1:2:1-1:3.5:1. The formula of the outer layer and the formula of the inner layer are consistent, and the preparation raw materials comprise the following components in percentage by mass: 20-45% of PCR polyethylene; 45-55% of low-density polyethylene; 8.5 to 20.5 percent of metallocene polyethylene; 1.5 to 4.5 percent of processing aid; the preparation raw materials of the intermediate layer comprise the following components in percentage by mass: 30-45% of PCR polyethylene; 45-55% of low-density polyethylene; 10-25% of metallocene polyethylene. The polyethylene label film of the invention can take reclaimed materials as raw materials and has the characteristics of low odor, low crystallization point and high stiffness.

Description

Polyethylene label film and preparation method and application thereof
Technical Field
The invention belongs to the technical field of plastic films, relates to a polyethylene label film and a preparation method and application thereof, and in particular relates to a PCR type polyethylene label film and a preparation method and application thereof.
Background
Plastic container packages are widely used for labels due to poor printing flexibility and low printing efficiency. The properties of the label film, which is the main component of the label, greatly affect the final effect of the label. Polyethylene is a rapidly developing label material.
In addition, according to the current environment-friendly situation, the positive development of recycling becomes an important problem related to society and ecology, and the treatment and recovery of waste plastics have a positive and profound significance. PCR (Post Consumer Recycling) is recycled by the consumer waste material, and the application of the PCR type polyethylene to the label film has a certain market prospect.
CN108790351a discloses a high-glossiness aluminized polyethylene label film and a production method thereof. The label film comprises a polyethylene film layer and an aluminized layer; the polyethylene film layer consists of a corona layer, an intermediate layer and a printing layer, wherein the thickness of the corona layer is 14-25 mu m, the thickness of the intermediate layer is 35-44 mu m, and the thickness of the printing layer is 14-25 mu m. The label film has extremely high glossiness, good metal texture, excellent physical and mechanical properties, uniform thickness and good labeling effect, and can be used for a long time in severe environment without aging and embrittlement.
CN110328945a discloses a high adhesion high brightness label film, which comprises a layer a, a layer B and a layer C, wherein the layer a, the layer B and the layer C are sequentially arranged from inside to outside, and the layer a and the layer C comprise the following components in percentage by weight: 60-70% of high-density polyethylene, 10-20% of modified polyethylene and the balance of low-density polyethylene. The modified polyethylene is added into the C layer of the label film positioned on the outer layer, so that the bonding force between interfaces is obviously improved, the surface tension is also increased, and the adhesive force of the label film on a product is enhanced. The low-density polyethylene enables the label film to have better transparency and moisture resistance, and ensures longer service life. The high-density polyethylene can improve the stiffness and the stretch-deformation resistance of the label film, has good influence on the subsequent character and pattern printing of the label film, and further improves the service life of the label film. The embossing roller set is formed by combining a mirror surface steel roller and a fine grinding rubber roller, the front surface of the label film pressed by the mirror surface steel roller has good glossiness, and the back surface of the label film has good matte effect.
However, neither CN108790351a nor CN110328945A uses recycled materials.
Accordingly, in the art, development of a polyethylene label film which can use a reclaimed material as a raw material and has a low odor, a low crystallization point and a high stiffness has been desired.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a polyethylene label film and a preparation method and application thereof, in particular to a PCR type polyethylene label film and a preparation method and application thereof. The polyethylene label film of the invention can take reclaimed materials as raw materials and has the characteristics of low odor, low crystallization point and high stiffness.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a polyethylene label film comprising, in order from top to bottom, an outer layer, an intermediate layer and an inner layer, the label film having a thickness of 75-85 μm, for example 75 μm, 76 μm, 78 μm, 80 μm, 82 μm, 84 μm or 85 μm, etc.
In the invention, the outer layer is a layer with the surface subjected to corona treatment, and is suitable for subsequent printing; the middle layer is thicker to improve the stiffness of the film; the inner layer is suitable for subsequent gluing. If the thickness of the label film is less than 75 mu m, the stiffness of the film is not high, and the subsequent labeling process is affected; if the thickness is more than 85 μm, the cost of the film is higher.
Preferably, the layer thickness ratio of the outer layer, the intermediate layer and the inner layer is 1:2:1-1:3.5:1, for example 1:2:1, 1:2.2:1, 1:2.4:1, 1:2.6:1, 1:2.8:1, 1:3:1, 1:3.2:1, 1:3.4:1 or 1:3.5:1, etc.
Preferably, the formulas of the outer layer and the inner layer are consistent, and the preparation raw materials comprise the following components in percentage by mass:
Figure BDA0003072847460000031
preferably, the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 30-45%
Low Density Polyethylene (LDPE) 45-55%
10-25% of Metallocene Polyethylene (MPE).
As the preferable technical scheme of the invention, the formulas and the thicknesses of the outer layer and the inner layer are consistent, so that the produced film is ensured not to curl, and the subsequent gluing, surface printing and labeling processes are facilitated.
Preferably, the PCR polyethylene may be used in an amount of 20%, 25%, 30%, 35%, 40% or 45% or the like in the raw materials for preparing the outer layer and the inner layer. If the amount of the PCR polyethylene is less than 20%, the stiffness of the prepared polyethylene label film is lowered.
Preferably, the low density polyethylene may be used in an amount of 45%, 48%, 50%, 52% or 55% or the like in the raw materials for preparing the outer layer and the inner layer.
Preferably, the metallocene polyethylene may be used in an amount of 8.5%, 10%, 15% or 20.5% or the like in the raw materials for preparing the outer layer and the inner layer.
Preferably, the processing aid may be used in an amount of 1.5%, 2%, 3%, 4% or 4.5% or the like in the raw materials for preparing the outer layer and the inner layer.
Preferably, the PCR polyethylene may be used in an amount of 30%, 33%, 35%, 38%, 40% or 45% or the like in the raw material for preparing the intermediate layer.
Preferably, the low-density polyethylene may be used in an amount of 45%, 48%, 50%, 52% or 55% or the like in the raw material for preparing the intermediate layer.
Preferably, the metallocene polyethylene may be used in an amount of 10%, 15%, 20% or 25% or the like in the raw material for preparing the intermediate layer.
Preferably, the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃ C./2.16 kg is 0.8-6g/10min, such as 0.8g/10min, 1g/10min, 2g/10min, 3g/10min, 4g/10min, 5g/10min or 6g/10min, etc., and the density of the PCR polyethylene is 0.955-0.965g/cm 3 For example 0.955g/cm 3 、0.96g/cm 3 Or 0.965g/cm 3 Etc. The PCR polyethylene can increase the stiffness of the film and improve the efficiency of the subsequent die cutting and labeling process.
Preferably, the low density polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 1-4g/10min, such as 1g/10min, 2g/10min, 3g/10min or 4g/10min, etc. at 190 ℃/2.16kg, the low density polyethylene has a density of 0.92-0.94g/cm 3 For example 0.92g/cm 3 、0.925g/cm 3 、0.93g/cm 3 、0.935g/cm 3 Or 0.94g/cm 3 Etc. The low-density polyethylene has more long branched chains and higher melt strength, and can improve the processability of the film.
Preferably, the metallocene polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 1-6g/10min, such as 1g/10min, 2g/10min, 3g/10min, 4g/10min, 5g/10min or 6g/10min, etc. under the condition of 190 ℃/2.16kg, and the metallocene polyethylene has a density of 0.94-0.965g/cm 3 For example 0.94g/cm 3 、0.945g/cm 3 、0.95g/cm 3 、0.955g/cm 3 、0.96g/cm 3 Or 0.965g/cm 3 Etc. The metallocene polyethylene further improves the stiffness of the film and can improve the processing efficiency of the subsequent working procedures.
Preferably, the processing aid in the outer layer and the inner layer comprises an opening agent and PPA, the mass ratio of the opening agent to the PPA is 2:1, and the addition of the PPA can reduce the defects of the surface of the film, such as common melt fracture phenomenon, and improve the brightness and smoothness of the surface of the film; and the addition of the opening agent can increase the opening performance of the film and prevent low molecular matters from separating out in the subsequent gluing and printing processes.
Preferably, the preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure BDA0003072847460000051
as a preferable technical scheme of the invention, the recycled milk bottle plastic particles are used as the preparation raw material of the PCR polyethylene, so that the aim of environmental protection is achieved; the prepared polyethylene label film has the characteristic of low odor by adding the odor eliminating agent.
Preferably, in the preparation raw material of the PCR polyethylene, the amount of the recovered plastic particles for milk bottles may be 60%, 63%, 65%, 68%, 70%, 73% or 75%, etc.
Preferably, the low-density polyethylene may be used in an amount of 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35% or 38% or the like in the raw material for preparing the PCR polyethylene.
Preferably, the amount of the antioxidant used in the preparation raw material of the PCR polyethylene may be 1%, 1.5%, 2%, 2.5%, 3%, 3.5% or 4%.
Preferably, the amount of the odor eliminator used in the raw material for preparing the PCR polyethylene may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5% or 4%.
Preferably, the processing aid may be used in an amount of 0.5%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8% or 2% in the raw material for preparing the PCR polyethylene.
Preferably, the low-density polyethylene has a melt index of 10-20g/10min, such as 10g/10min, 13g/10min, 15g/10min, 18g/10min or 20g/10min, etc. at 190 ℃/2.16kg, and a density of 0.92-0.94g/cm 3 For example 0.92g/cm 3 、0.925g/cm 3 、0.93g/cm 3 、0.935g/cm 3 Or 0.94g/cm 3 Etc.
Preferably, the antioxidant comprises an antioxidant 1076 and an antioxidant 168, and the mass ratio of the antioxidant to the antioxidant is 4:1. The antioxidant effect can be improved by adding the compounded antioxidant, and appearance defects of crystal points and black points generated during granulation can be effectively controlled.
Preferably, the odor eliminator is an odor eliminator having a molecular sieve structure, preferably An Peise 1000622-K. The odor eliminator can adsorb the pungent odor generated by the recycled plastic particles of the milk bottle in the plasticizing process.
Preferably, the processing aid is PPA.
Preferably, the preparation method of the PCR polyethylene comprises the following steps:
and mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the processing aid, melting, filtering, extruding and granulating to obtain the PCR polyethylene.
Preferably, the mixing is performed in a high speed mixer.
Preferably, the rotational speed of the mixing is 500-1000rpm, such as 500rpm, 600rpm, 700rpm, 800rpm, 900rpm or 1000rpm, etc.
Preferably, the mixing is for a time of 1-3min, such as 1min, 2min or 3min.
Preferably, the temperature of the melting is 170-200 ℃, e.g. 170 ℃, 180 ℃, 190 ℃, or 200 ℃, etc.
Preferably, the number of the filter meshes used in the filtration is set to 20/80/200/80/20, so that particles in a molten state, which are bad in plasticization and excessive in oxidation, can be surely filtered out, and the generation of crystal spots and black spots of the film can be reduced.
In a second aspect, the present invention provides a method for preparing the polyethylene label film according to the first aspect, the method comprising the steps of:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting, plasticizing, filtering, extruding through a die head, cooling and shaping, and carrying out corona treatment to obtain the polyethylene label film.
Preferably, the temperature of the melting is 180-210 ℃, e.g., 180 ℃, 185 ℃, 190 ℃, 195 ℃, 200 ℃, 205 ℃, or 210 ℃, etc.
Preferably, the number of filter meshes used in the filtration is set to 20/80/200/80/20.
In a third aspect, the present invention provides the use of the polyethylene label film of the first aspect in a label.
Compared with the prior art, the invention has at least the following beneficial effects:
the polyethylene label film of the invention can use reclaimed materials as raw materials, achieves the aim of environmental protection, and has low odor and low crystal point (the crystal point area is less than or equal to 0.05mm per square meter) 2 The number of crystal points is 3 to 8) and high stiffness (tensile elastic modulus: longitudinal direction: 610-707MPa, transverse: 700-825MPa; bending stiffness: longitudinal direction: 35-45mN, transverse: 45-55 mN) meets the use requirements of the conventional polyethylene label film.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
In the following examples, unless otherwise specified, all experimental methods used were conventional and all materials, reagents, etc. were purchased from chemical companies.
Example 1
In this embodiment, a polyethylene label film is provided, where the label film includes, from top to bottom, an outer layer, an intermediate layer, and an inner layer in order, the thickness of the label film is 77 μm, and the layer thickness ratio of the outer layer, the intermediate layer, and the inner layer is 1:3:1.
The preparation raw materials of the outer layer and the inner layer comprise the following components in percentage by mass:
Figure BDA0003072847460000071
the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 40%
45% of low density polyethylene
15% of metallocene polyethylene.
Wherein the melt fingers of the PCR polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg are all 0.8g/10min, and the densities are all 0.961g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg is 2g/10min, and the density is 0.92g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The metallocene polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 1g/10min at 190 ℃/2.16kg and a density of 0.94g/cm 3 。
The preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure BDA0003072847460000081
wherein the melt index of the low-density polyethylene under the condition of 190 ℃/2.16kg is 10g/10min, and the density is 0.92g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The antioxidant comprises an antioxidant 1076 and an antioxidant 168, and the mass ratio of the antioxidant to the antioxidant is 4:1.
The preparation method of the PCR polyethylene comprises the following steps:
mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the PPA in a high-speed mixer at a rotating speed of 500rpm for 3min, melting at 180 ℃, filtering by a filter screen with a mesh number of 20/80/200/80/20, extruding, and granulating to obtain the PCR polyethylene.
The preparation method of the polyethylene label film comprises the following steps:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering by a filter screen with the mesh number of 20/80/200/80/20, extruding by a die head, and cooling and shaping to obtain the polyethylene label film.
Example 2
In this embodiment, a polyethylene label film is provided, where the label film includes, from top to bottom, an outer layer, an intermediate layer, and an inner layer in order, the thickness of the label film is 80 μm, and the layer thickness ratio of the outer layer, the intermediate layer, and the inner layer is 1:2.5:1.
The preparation raw materials of the outer layer and the inner layer comprise the following components in percentage by mass:
Figure BDA0003072847460000091
the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 40%
50% of low density polyethylene
10% of metallocene polyethylene;
wherein the fusion fingers of the PCR polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg are 1g/10min, and the densities are 0.96g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg is 1.5g/10min, and the density is 0.923g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt fingers of the metallocene polyethylene under the conditions of 190 ℃/2.16kg are 1.3g/10min, and the density is 0.941g/cm 3 。
The preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure BDA0003072847460000092
Figure BDA0003072847460000101
wherein the melt index of the low-density polyethylene under the condition of 190 ℃/2.16kg is 10g/10min, and the density is 0.93g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The antioxidant comprises an antioxidant 1076 and an antioxidant 168, and the mass ratio of the antioxidant to the antioxidant is 4:1.
The preparation method of the PCR polyethylene comprises the following steps:
mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the PPA in a high-speed mixer at a rotating speed of 600rpm for 3min, melting at 200 ℃, filtering by a filter screen with a mesh number of 20/80/200/80/20, extruding, and granulating to obtain the PCR polyethylene.
The preparation method of the polyethylene label film comprises the following steps:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering by a filter screen with the mesh number of 20/80/200/80/20, extruding by a die head, and cooling and shaping to obtain the polyethylene label film.
Example 3
In this embodiment, a polyethylene label film is provided, where the label film includes, from top to bottom, an outer layer, an intermediate layer, and an inner layer in order, the thickness of the label film is 85 μm, and the layer thickness ratio of the outer layer, the intermediate layer, and the inner layer is 1:3:1.
The preparation raw materials of the outer layer and the inner layer comprise the following components in percentage by mass:
Figure BDA0003072847460000102
the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 30%
55% of low density polyethylene
15% of metallocene polyethylene.
Wherein the melt fingers of the PCR polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg are 2g/10min, and the densities are 0.955g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg is 2g/10min, and the density is 0.93g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The metallocene polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 3g/10min and a density of 0.96g/cm under the condition of 190 ℃/2.16kg 3 。
The preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure BDA0003072847460000111
wherein the melt index of the low-density polyethylene under the condition of 190 ℃/2.16kg is 15g/10min, and the density is 0.94g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The antioxidant comprises an antioxidant 1076 and an antioxidant 168, and the mass ratio of the antioxidant to the antioxidant is 4:1.
The preparation method of the PCR polyethylene comprises the following steps:
mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the PPA in a high-speed mixer at a rotating speed of 700rpm for 2min, melting at 200 ℃, filtering by a filter screen with a mesh number of 20/80/200/80/20, extruding, and granulating to obtain the PCR polyethylene.
The preparation method of the polyethylene label film comprises the following steps:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering by a filter screen with the mesh number of 20/80/200/80/20, extruding by a die head, and cooling and shaping to obtain the polyethylene label film.
Example 4
In this embodiment, a polyethylene label film is provided, where the label film includes, from top to bottom, an outer layer, an intermediate layer, and an inner layer in order, the thickness of the label film is 75 μm, and the layer thickness ratio of the outer layer, the intermediate layer, and the inner layer is 1:3.5:1.
The preparation raw materials of the outer layer and the inner layer comprise the following components in percentage by mass:
Figure BDA0003072847460000121
the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 30%
45% of low density polyethylene
25% of metallocene polyethylene.
Wherein the fusion fingers of the PCR polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg are 3g/10min, and the densities are 0.965g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The low-density polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 3g/10min at 190 ℃/2.16kg and a density of 0.935g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The metallocene polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 4g/10min and a density of 0.965g/cm under the condition of 190 ℃/2.16kg 3 。
The preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure BDA0003072847460000122
Figure BDA0003072847460000131
wherein the melt index of the low-density polyethylene under the condition of 190 ℃/2.16kg is 12g/10min, and the density is 0.922g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The antioxidant comprises an antioxidant 1076 and an antioxidant 168, and the mass ratio of the antioxidant to the antioxidant is 4:1.
The preparation method of the PCR polyethylene comprises the following steps:
mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the PPA in a high-speed mixer at the rotating speed of 800rpm for 2min, then melting at 170 ℃, filtering by a filter screen with the mesh number of 20/80/200/80/20, extruding, and granulating to obtain the PCR polyethylene.
The preparation method of the polyethylene label film comprises the following steps:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting and plasticizing at 180 ℃, filtering by a filter screen with the mesh number of 20/80/200/80/20, extruding by a die head, and cooling and shaping to obtain the polyethylene label film.
Example 5
In this embodiment, a polyethylene label film is provided, where the label film includes, from top to bottom, an outer layer, an intermediate layer, and an inner layer in order, the thickness of the label film is 85 μm, and the layer thickness ratio of the outer layer, the intermediate layer, and the inner layer is 1:2:1.
The preparation raw materials of the outer layer and the inner layer comprise the following components in percentage by mass:
Figure BDA0003072847460000132
Figure BDA0003072847460000141
the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 30%
50% of low density polyethylene
20% of metallocene polyethylene.
Wherein the melt fingers of the PCR polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg are 5g/10min, and the density is 0.96g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg is 4g/10min, and the density is 0.94g/cm 3 The metallocene polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 6g/10min at 190 ℃/2.16kg and a density of 0.955g/cm 3 。
The preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure BDA0003072847460000142
wherein the low density polyethylene is at 190 ℃/2.16kgThe melt index is 20g/10min, and the density is 0.933g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The antioxidant comprises an antioxidant 1076 and an antioxidant 168, and the mass ratio of the antioxidant to the antioxidant is 4:1.
The preparation method of the PCR polyethylene comprises the following steps:
mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the PPA in a high-speed mixer at a rotating speed of 900rpm for 2min, melting at 180 ℃, filtering by a filter screen with a mesh number of 20/80/200/80/20, extruding, and granulating to obtain the PCR polyethylene.
The preparation method of the polyethylene label film comprises the following steps:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting and plasticizing at 210 ℃, filtering by a filter screen with the mesh number of 20/80/200/80/20, extruding by a die head, and cooling and shaping to obtain the polyethylene label film.
Example 6
In this embodiment, a polyethylene label film is provided, where the label film includes, from top to bottom, an outer layer, an intermediate layer, and an inner layer in order, the thickness of the label film is 80 μm, and the layer thickness ratio of the outer layer, the intermediate layer, and the inner layer is 1:3.2:1.
The preparation raw materials of the outer layer and the inner layer comprise the following components in percentage by mass:
Figure BDA0003072847460000151
the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 45%
45% of low density polyethylene
10% of metallocene polyethylene.
Wherein the fusion fingers of the PCR polyethylene in the outer layer, the middle layer and the inner layer under the condition of 190 ℃/2.16kg are 6g/10min, and the densities are 0.96g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Outer layer, middleThe low density polyethylene in the layer and the inner layer had a melt index of 1g/10min at 190 ℃/2.16kg and a density of 0.935g/cm 3 The metallocene polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 6g/10min under the condition of 190 ℃/2.16kg and a density of 0.945g/cm 3 。
The preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure BDA0003072847460000161
wherein the melt index of the low-density polyethylene under the condition of 190 ℃/2.16kg is 17g/10min, and the density is 0.93g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The antioxidant comprises an antioxidant 1076 and an antioxidant 168, and the mass ratio of the antioxidant to the antioxidant is 4:1.
The preparation method of the PCR polyethylene comprises the following steps:
mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the PPA in a high-speed mixer at a rotating speed of 1000rpm for 1min, melting at 190 ℃, filtering by a filter screen with a mesh number of 20/80/200/80/20, extruding, and granulating to obtain the PCR polyethylene.
The preparation method of the polyethylene label film comprises the following steps:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering by a filter screen with the mesh number of 20/80/200/80/20, extruding by a die head, and cooling and shaping to obtain the polyethylene label film.
Example 7
This example differs from example 1 only in that the PCR polyethylene in the outer, middle and inner layers was replaced with an equivalent amount of non-PCR starting material HTA 108 (manufacturer: exxonMobil chemical) having a melt index of 0.7g/10min and a density of 0.961g/cm at 190 ℃/2.16kg 3 。
Example 8
This example differs from example 1 only in that the raw material for preparing the PCR polyethylene does not include a deodorizing agent, and the mass percentage of the low density polyethylene is 38.5%.
Example 9
This example differs from example 1 only in that the number of filter meshes used in the filtration in the preparation of the PCR polyethylene was 20/80/80/20.
Example 10
The present example differs from example 3 only in that the mass percentage of the PCR polyethylene and the mass percentage of the low density polyethylene in the raw materials for preparing the outer layer and the inner layer are 15% and 60%.
Example 11
This example differs from example 3 only in that the intermediate layer was prepared from 55% by mass of PCR polyethylene and 30% by mass of low density polyethylene.
Comparative example 1
This comparative example differs from example 1 only in that the thickness of the label film is 70 μm.
The polyethylene label films of examples 1-11 and comparative example 1 were subjected to performance testing as follows:
(1) Tensile modulus of elasticity: testing according to the method of GB/T1040.3-2006;
(2) Elmendorf tear: testing according to the method of GB/T16578.2-2009;
(3) Bending stiffness: testing according to the method of GB/T22364-2018;
(4) Number of crystal dots/m 2 : visual inspection, and taking the crystal point area card as a reference;
(5) Olfactory test: placing in a glass bottle, placing in a baking oven at 40 ℃ for 30min, and taking out for odor test.
The results of the performance test are shown in Table 1.
TABLE 1
Figure BDA0003072847460000171
/>
Figure BDA0003072847460000181
Wherein MD in the table refers to the machine direction and CD refers to the cross direction.
As can be seen from Table 1, the polyethylene label films prepared in examples 1 to 6 were higher in both the transverse-longitudinal tensile elastic modulus (longitudinal: 610 to 707MPa, transverse: 700 to 825 MPa) and the bending stiffness (longitudinal: 35 to 45mN, transverse: 45 to 55 mN), which indicated that the polyethylene label films had higher stiffness, and the longitudinal Elmendorf tear was lower than 400mN (270 to 360 mN), which indicated that the polyethylene label films were better in die-cutting property, and the crystal point per square meter (crystal point area was 0.05mm or less 2 ) The number is lower than 10 (3-8), and no area is larger than 0.05mm 2 This indicates that the polyethylene label film has a low crystallization point and that the polyethylene label film is almost odorless as can be seen by the olfactory test.
As can be seen from the results of examples 1 and 7, the polyethylene label films prepared in examples 1 and 7 have very little difference in properties and the number of crystal points in example 1 is smaller, which means that the use of the recycled material as a raw material in the present invention does not reduce the properties of the polyethylene label film, and at the same time has a low crystal point, and can achieve the purpose of environmental protection.
The polyethylene label film prepared in example 8 had a pungent odor as compared to example 1.
The polyethylene label film prepared in example 9 has more crystal points compared to example 1, which shows that the number of filter meshes affects the number of crystal points of the product.
The polyethylene label film prepared in example 10 had a reduced transverse direction tensile modulus of elasticity and bending stiffness compared to example 3.
The polyethylene label film prepared in example 11 had a slight increase in both transverse-longitudinal tensile modulus of elasticity and bending stiffness, but had more crystalline spots, as compared to example 3.
The polyethylene label film prepared in comparative example 1 had a reduced transverse-longitudinal tensile elastic modulus and bending stiffness as compared to example 1.
The applicant states that the present invention is illustrated by the above examples as well as the method of making and using the same, but the present invention is not limited to, i.e., does not mean that the present invention must be practiced in dependence upon the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.

Claims (19)

1. The PCR type polyethylene label film is characterized by comprising an outer layer, an intermediate layer and an inner layer from top to bottom, wherein the thickness of the label film is 75-85 mu m;
the formula of the outer layer and the formula of the inner layer are consistent, and the preparation raw materials comprise the following components in percentage by mass:
Figure FDA0004066544090000011
the preparation raw materials of the intermediate layer comprise the following components in percentage by mass:
PCR polyethylene 30-45%
45-55% of low density polyethylene
10-25% of metallocene polyethylene;
the processing aids in the outer and inner layers include an opener and PPA;
the layer thickness ratio of the outer layer to the middle layer to the inner layer is 1:2:1-1:3.5:1;
the preparation raw materials of the PCR polyethylene comprise the following components in percentage by mass:
Figure FDA0004066544090000012
in the preparation method of the PCR polyethylene, the number of filter meshes used in the filtration is set to 20/80/200/80/20.
2. The polyethylene label film according to claim 1, wherein the PCR polyethylene in the outer layer, the middle layer and the inner layer has a melt index of 0.8-6g/10min at 190 ℃/2.16kg and a density of 0.955-0.965g/cm 3 。
3. The polyethylene label film according to claim 1, wherein the low density polyethylene in the outer layer, the intermediate layer and the inner layer has a melt index of 1 to 4g/10min at 190 ℃/2.16kg and a density of 0.92 to 0.94g/cm 3 。
4. The polyethylene label film according to claim 1, wherein the metallocene polyethylene in the outer layer, the intermediate layer and the inner layer has a melt index of 1 to 6g/10min at 190 ℃/2.16kg and a density of 0.94 to 0.965g/cm 3 。
5. The polyethylene label film of claim 1, wherein the mass ratio of the opening agent to PPA is 2:1.
6. The polyethylene label film according to claim 1, wherein the low-density polyethylene has a melt index of 10 to 20g/10min at 190 ℃/2.16kg and a density of 0.92 to 0.94g/cm in the raw material for producing the PCR polyethylene 3 。
7. The polyethylene label film according to claim 1, wherein the antioxidants comprise an antioxidant 1076 and an antioxidant 168 in the raw materials for preparing the PCR polyethylene.
8. The polyethylene label film according to claim 7, wherein the mass ratio of the antioxidant 1076 to the antioxidant 168 is 4:1.
9. The polyethylene label film according to claim 1, wherein the odor eliminator is an odor eliminator having a molecular sieve structure in the raw material for producing the PCR polyethylene.
10. The polyethylene label film according to claim 9, wherein the odor eliminator is an color of tone 1000622-K.
11. The polyethylene label film according to claim 1, wherein the processing aid is PPA in the raw material for preparing the PCR polyethylene.
12. The polyethylene label film according to claim 1, wherein the PCR polyethylene is prepared by:
and mixing the recycled plastic particles of the milk bottle, the low-density polyethylene, the antioxidant, the odor eliminating agent and the processing aid, melting, filtering, extruding and granulating to obtain the PCR polyethylene.
13. The polyethylene label film of claim 12, wherein the mixing is performed in a high speed mixer.
14. The polyethylene label film according to claim 12, wherein the rotational speed of the mixing is 500-1000rpm and the mixing time is 1-3min.
15. The polyethylene label film of claim 12, wherein the melting temperature is 170-200 ℃.
16. The method of producing a polyethylene label film according to any one of claims 1 to 15, characterized in that the method of producing comprises the steps of:
and respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer coextrusion casting equipment or film blowing equipment, melting, plasticizing, filtering, extruding, cooling and shaping to obtain the polyethylene label film.
17. The method of claim 16, wherein the melting temperature is 180-210 ℃.
18. The method according to claim 16, wherein the number of the filter mesh used in the filtration is set to 20/80/200/80/20.
19. Use of the polyethylene label film according to any one of claims 1-15 in labels.
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