CN113246569A - 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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Publication number
CN113246569A
CN113246569A CN202110543937.3A CN202110543937A CN113246569A CN 113246569 A CN113246569 A CN 113246569A CN 202110543937 A CN202110543937 A CN 202110543937A CN 113246569 A CN113246569 A CN 113246569A
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polyethylene
layer
label film
density
pcr
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CN113246569B (en
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朱业玲
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Shanghai Zijiang Colour Printing & Packaging Co ltd
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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

Abstract

The invention provides a polyethylene label film and a preparation method and application thereof, wherein the label film sequentially comprises an outer layer, a middle 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 middle layer to the inner layer is 1:2:1-1:3.5: 1. The formula of the outer layer is consistent with that of the inner layer, and the preparation raw materials comprise the following components in percentage by mass: 20-45% of PCR polyethylene; 45-55% of low-density polyethylene; metallocene polyethylene 8.5-20.5%; 1.5 to 4.5 percent of processing aid; the preparation raw materials of the middle 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 can use reclaimed materials as raw materials and has the characteristics of low odor, low crystal 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 particularly relates to a PCR type polyethylene label film and a preparation method and application thereof.
Background
Plastic container packaging has been widely used as a label due to poor printing adaptability and low printing efficiency. The performance of the label film as a major component of the label greatly affects the final effect of the label. Polyethylene is a rapidly growing label material.
In addition, according to the current environment-friendly situation, the active development of recycling becomes an important problem concerning society and ecology, and the treatment and recovery of waste plastics have profound significance. The PCR (post Consumer recycling) is the recycling of the waste materials of consumers, and the application of the PCR type polyethylene to the label film has certain market prospect.
CN108790351A discloses a high-gloss aluminized polyethylene label film and a production method thereof. The label film comprises a polyethylene film layer and an aluminum coating layer; the polyethylene film layer consists of a corona layer, a middle layer and a printing layer, wherein the thickness of the corona layer is 14-25 mu m, the thickness of the middle layer is 35-44 mu m, and the thickness of the printing layer is 14-25 mu m. The label film has the advantages of 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 an A layer, a B layer and a C layer which are arranged from inside to outside in sequence, wherein the A layer and the C layer 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 layer C of the label film positioned at the outer layer, so that the interfacial adhesion is obviously improved, the surface tension is increased, and the adhesion 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-proof deformation capacity of the label film, has good influence on subsequent character and pattern printing of the label film, and further prolongs the service life of the label film. The embossing roller group adopts the combination of a mirror steel roller and a fine sanding rubber roller, the front surface of the label film pressed by the mirror steel roller has good glossiness, and the back surface of the label film has a good sub-light effect.
However, neither the raw materials of CN108790351A nor CN110328945A were used as recycled materials.
Therefore, in the art, it is desired to develop a polyethylene label film which can use a recycled material as a raw material and has low odor, low crystal point and high stiffness.
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 can use reclaimed materials as raw materials and has the characteristics of low odor, low crystal point and high stiffness.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a polyethylene label film, which comprises an outer layer, a middle layer and an inner layer in sequence from top to bottom, and the thickness of the label film is 75-85 μm, such as 75 μm, 76 μm, 78 μm, 80 μm, 82 μm, 84 μm or 85 μm.
In the invention, the outer layer refers to a layer with corona treatment on the surface, and is suitable for subsequent printing; the middle layer is thicker so as 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 influenced; if the thickness is more than 85 μm, the cost of the film becomes higher.
Preferably, the ratio of the layer thicknesses of the outer layer, the intermediate layer and the inner layer is 1:2:1 to 1:3.5:1, such as 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:
30-45% of PCR polyethylene
Low Density Polyethylene (LDPE) 45-55%
10-25% of Metallocene Polyethylene (MPE).
As the preferred 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 can be prevented from curling, and the subsequent gluing, surface printing and labeling processes are facilitated.
Preferably, the amount of the PCR polyethylene used in the raw materials for preparing the outer layer and the inner layer may be 20%, 25%, 30%, 35%, 40%, 45%, or the like. If the amount of the PCR polyethylene is less than 20%, the stiffness of the prepared polyethylene label film is reduced.
Preferably, the low density polyethylene may be used in an amount of 45%, 48%, 50%, 52%, 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%, 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%, 4.5%, or the like, in the raw materials for preparing the outer layer and the inner layer.
Preferably, in the raw material for preparing the intermediate layer, the amount of the PCR polyethylene may be 30%, 33%, 35%, 38%, 40%, 45%, or the like.
Preferably, the low density polyethylene may be used in an amount of 45%, 48%, 50%, 52%, 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%, 25%, or the like, in the raw material for preparing the intermediate layer.
Preferably, the melt index of the PCR polyethylene in the outer, middle and inner layers is 0.8-6g/10min, such as 0.8g/10min, 1g/10min, 2g/10min, 3g/10min, 4g/10min, 5g/10min or 6g/10min at 190 ℃/2.16kg, and the density of the PCR polyethylene is 0.955-0.965g/cm3For example 0.955g/cm3、0.96g/cm3Or 0.965g/cm3And the like. The PCR polyethylene can increase the stiffness of the film and improve the efficiency of the subsequent die cutting and labeling processes.
Preferably, the melt index of the low density polyethylene in the outer layer, the middle layer and the inner layer is 1-4g/10min, such as 1g/10min, 2g/10min, 3g/10min or 4g/10min at 190 ℃/2.16kg, and the density of the low density polyethylene is 0.92-0.94g/cm3E.g. 0.92g/cm3、0.925g/cm3、0.93g/cm3、0.935g/cm3Or 0.94g/cm3And the like. The low-density polyethylene has more long-chain branches and higher melt strength, and can improve the processing performance of the film.
Preferably, the melt index of the metallocene polyethylene in the outer layer, the middle layer and the inner layer is 1-6g/10min, such as 1g/10min, 2g/10min, 3g/10min, 4g/10min, 5g/10min or 6g/10min at 190 ℃/2.16kg, and the density of the metallocene polyethylene is 0.94-0.965g/cm3E.g. 0.94g/cm3、0.945g/cm3、0.95g/cm3、0.955g/cm3、0.96g/cm3Or 0.965g/cm3And the like. The metallocene polyethylene further improves the stiffness of the film and can improve the processing efficiency of subsequent 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 PPA is added to reduce the surface defects of the film, such as the common melt fracture phenomenon, and improve the surface brightness and smoothness of the film; and the addition of the opening agent can increase the opening performance of the film and prevent the low molecular substances from being separated 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 the preferred technical scheme of the invention, the recycled plastic particles of the milk bottle are used as the raw materials for preparing the PCR polyethylene, thereby achieving the purpose of environmental protection; by adding the odor eliminating agent, the prepared polyethylene label film has the characteristic of low odor.
Preferably, in the raw material for preparing the PCR polyethylene, the recycled plastic particles of the milk bottle can be used in an amount of 60%, 63%, 65%, 68%, 70%, 73%, 75% or the like.
Preferably, the low density polyethylene may be used in an amount of 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38%, or the like, in the raw material for preparing the PCR polyethylene.
Preferably, in the raw material for preparing the PCR polyethylene, the antioxidant can be used in an amount of 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, etc.
Preferably, in the raw material for preparing the PCR polyethylene, the amount of the odor eliminating agent may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, or the like.
Preferably, in the raw material for preparing the PCR polyethylene, the processing aid may be used in an amount of 0.5%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, or the like.
Preferably, the melt index of the low density polyethylene at 190 ℃/2.16kg is 10-20g/10min, such as 10g/10min, 13g/10min, 15g/10min, 18g/10min or 20g/10min, etc., and the density of the low density polyethylene is 0.92-0.94g/cm3E.g. 0.92g/cm3、0.925g/cm3、0.93g/cm3、0.935g/cm3Or 0.94g/cm3And the like.
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 addition of the compound antioxidant can improve the antioxidant effect and effectively control the appearance defects of crystal points and black points generated during granulation.
Preferably, the smell eliminating agent is a smell eliminating agent with a molecular sieve structure, preferably an achromatic color 1000622-K. The smell eliminating agent can adsorb pungent smell generated in the plasticizing process of the recycled plastic particles of the milk bottle.
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 carried out in a high speed mixer.
Preferably, the rotation speed of the mixing is 500-1000rpm, such as 500rpm, 600rpm, 700rpm, 800rpm, 900rpm or 1000rpm, etc.
Preferably, the time of mixing is 1-3min, such as 1min, 2min or 3 min.
Preferably, the temperature of the melting is 170-200 ℃, such as 170 ℃, 180 ℃, 190 ℃ or 200 ℃ and the like.
Preferably, the mesh number of the filter screen used for filtering is 20/80/200/80/20, so that the particles in a molten state with poor plasticization and excessive oxidation can be filtered, and the generation of film crystal points and black points can be reduced.
In a second aspect, the present invention provides a method for preparing the polyethylene label film of 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 co-extrusion casting equipment or film blowing equipment, melting, plasticizing, filtering, extruding through a die head, cooling and shaping, and performing corona treatment to obtain the polyethylene label film.
Preferably, the melting temperature is 180-210 ℃, such as 180 ℃, 185 ℃, 190 ℃, 195 ℃, 200 ℃, 205 ℃, or 210 ℃.
Preferably, the mesh number of the filter screens used for filtering 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 can use reclaimed materials as raw materials, achieves the aim of environmental protection, and has low smell and low crystal points (the area of the crystal points per square meter is less than or equal to 0.05 mm)2The number of crystal points of 3 to 8) and high stiffness (tensile elastic modulus: longitudinal direction: 610-707MPa, transverse: 700-825 MPa; bending stiffness: longitudinal direction: 35-45mN, transverse: 45-55mN), and meets the use requirement of the conventional polyethylene label film.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
In the following examples, unless otherwise specified, the experimental methods used were all conventional methods, and materials, reagents and the like used were all available from chemical companies.
Example 1
In the embodiment, the polyethylene label film comprises an outer layer, a middle layer and an inner layer from top to bottom, the thickness of the label film is 77 μm, and the layer thickness ratio of the outer layer to the middle layer to 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 middle layer comprise the following components in percentage by mass:
40% of PCR polyethylene
45 percent of low-density polyethylene
15% of metallocene polyethylene.
Wherein, the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer is 0.8g/10min under the condition of 190 ℃/2.16kg, and the density is 0.961g/cm3(ii) a The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer is 2g/10min under the condition of 190 ℃/2.16kg, and the density is 0.92g/cm3(ii) a The melt index of the metallocene polyethylene in the outer layer, the middle layer and the inner layer is 1g/10min under the condition of 190 ℃/2.16kg, and the density is 0.94g/cm3。
The PCR polyethylene comprises the following raw materials in percentage by mass:
Figure BDA0003072847460000081
wherein the melt index of the low-density polyethylene at 190 ℃/2.16kg is 10g/10min, and the density is 0.92g/cm3(ii) a The antioxidant comprises antioxidant1076 and an antioxidant 168 in a mass ratio of 4: 1.
The preparation method of the PCR polyethylene comprises the following steps:
and (3) 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 500rpm for 3min, then melting at 180 ℃, filtering through 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:
respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer co-extrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering through a filter screen with the mesh number of 20/80/200/80/20, extruding through a die head, and cooling and shaping to obtain the polyethylene label film.
Example 2
In this embodiment, a polyethylene label film is provided, which includes, from top to bottom, an outer layer, a middle layer, and an inner layer, where the thickness of the label film is 80 μm, and the layer thickness ratio of the outer layer, the middle 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 middle layer comprise the following components in percentage by mass:
40% of PCR polyethylene
50 percent of low-density polyethylene
10% of metallocene polyethylene;
wherein, the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer is 1g/10min under the condition of 190 ℃/2.16kg, and the density is 0.96g/cm3(ii) a The melting fingers of the low-density polyethylene in the outer layer, the middle layer and the inner layer are all under the condition of 190 ℃/2.16kgIs 1.5g/10min, and the density is 0.923g/cm3(ii) a The melt index of the metallocene polyethylene at 190 ℃/2.16kg is 1.3g/10min, and the density is 0.941g/cm3。
The PCR polyethylene comprises the following raw materials in percentage by mass:
Figure BDA0003072847460000092
Figure BDA0003072847460000101
wherein the melt index of the low-density polyethylene at 190 ℃/2.16kg is 10g/10min, and the density is 0.93g/cm3(ii) a 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:
and (3) 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 600rpm for 3min, then melting at 200 ℃, filtering through 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:
respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer co-extrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering through a filter screen with the mesh number of 20/80/200/80/20, extruding through a die head, and cooling and shaping to obtain the polyethylene label film.
Example 3
In this embodiment, a polyethylene label film is provided, which includes, from top to bottom, an outer layer, a middle layer, and an inner layer, where the thickness of the label film is 85 μm, and the layer thickness ratio of the outer layer, the middle 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 middle layer comprise the following components in percentage by mass:
30% of PCR polyethylene
55 percent of low-density polyethylene
15% of metallocene polyethylene.
Wherein, the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer is 2g/10min under the condition of 190 ℃/2.16kg, and the density is 0.955g/cm3(ii) a The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer is 2g/10min under the condition of 190 ℃/2.16kg, and the density is 0.93g/cm3(ii) a The melt index of the metallocene polyethylene in the outer layer, the middle layer and the inner layer is 3g/10min under the condition of 190 ℃/2.16kg, and the density is 0.96g/cm3。
The PCR polyethylene comprises the following raw materials in percentage by mass:
Figure BDA0003072847460000111
wherein the melt index of the low-density polyethylene at 190 ℃/2.16kg is 15g/10min, and the density is 0.94g/cm3(ii) a 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:
and (3) 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 700rpm for 2min, then melting at 200 ℃, filtering through 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:
respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer co-extrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering through a filter screen with the mesh number of 20/80/200/80/20, extruding through a die head, and cooling and shaping to obtain the polyethylene label film.
Example 4
In this embodiment, a polyethylene label film is provided, which comprises an outer layer, a middle layer and an inner layer from top to bottom in sequence, wherein the thickness of the label film is 75 μm, and the layer thickness ratio of the outer layer, the middle 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 middle layer comprise the following components in percentage by mass:
30% of PCR polyethylene
45 percent of low-density polyethylene
Metallocene polyethylene 25%.
Wherein, the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer is 3g/10min under the condition of 190 ℃/2.16kg, and the density is 0.965g/cm3(ii) a The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer is 3g/10min under the condition of 190 ℃/2.16kg, and the density is 0.935g/cm3(ii) a The melt index of the metallocene polyethylene in the outer layer, the middle layer and the inner layer is 4g/10min under the condition of 190 ℃/2.16kg, and the density is 0.965g/cm3。
The PCR polyethylene comprises the following raw materials in percentage by mass:
Figure BDA0003072847460000122
Figure BDA0003072847460000131
wherein the melt index of the low-density polyethylene at 190 ℃/2.16kg is 12g/10min, and the density is 0.922g/cm3(ii) a 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:
and (3) 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 through 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:
respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer co-extrusion casting equipment or film blowing equipment, melting and plasticizing at 180 ℃, filtering through a filter screen with the mesh number of 20/80/200/80/20, extruding through a die head, and cooling and shaping to obtain the polyethylene label film.
Example 5
In this embodiment, a polyethylene label film is provided, which includes, from top to bottom, an outer layer, a middle layer, and an inner layer, where the thickness of the label film is 85 μm, and the layer thickness ratio of the outer layer, the middle 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 middle layer comprise the following components in percentage by mass:
30% of PCR polyethylene
50 percent of low-density polyethylene
20% of metallocene polyethylene.
Wherein, the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer is 5g/10min under the condition of 190 ℃/2.16kg, and the density is 0.96g/cm3(ii) a The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer is 4g/10min under the condition of 190 ℃/2.16kg, and the density is 0.94g/cm3The melt index of the metallocene polyethylene in the outer layer, the middle layer and the inner layer is 6g/10min under the condition of 190 ℃/2.16kg, and the density is 0.955g/cm3。
The PCR polyethylene comprises the following raw materials in percentage by mass:
Figure BDA0003072847460000142
wherein the melt index of the low density polyethylene at 190 ℃/2.16kg is 20g/10min, and the density is 0.933g/cm3(ii) a 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:
and (3) 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 900rpm for 2min, then melting at 180 ℃, filtering through 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:
respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer co-extrusion casting equipment or film blowing equipment, melting and plasticizing at 210 ℃, filtering through a filter screen with the mesh number of 20/80/200/80/20, extruding through a die head, and cooling and shaping to obtain the polyethylene label film.
Example 6
In this embodiment, a polyethylene label film is provided, which includes, from top to bottom, an outer layer, a middle layer, and an inner layer, where the thickness of the label film is 80 μm, and the layer thickness ratio of the outer layer, the middle 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 middle layer comprise the following components in percentage by mass:
45% of PCR polyethylene
45 percent of low-density polyethylene
10% of metallocene polyethylene.
Wherein, the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer is 6g/10min under the condition of 190 ℃/2.16kg, and the density is 0.96g/cm3(ii) a The melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer is 1g/10min under the condition of 190 ℃/2.16kg, and the density is 0.935g/cm3The melt index of the metallocene polyethylene in the outer layer, the middle layer and the inner layer is 6g/10min under the condition of 190 ℃/2.16kg, and the density is 0.945g/cm3。
The PCR polyethylene comprises the following raw materials in percentage by mass:
Figure BDA0003072847460000161
wherein the melt index of the low-density polyethylene at 190 ℃/2.16kg is 17g/10min, and the density is 0.93g/cm3(ii) a 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:
and (3) 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 1000rpm for 1min, then melting at 190 ℃, filtering through 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:
respectively adding the preparation raw materials in the outer layer, the middle layer and the inner layer into three-layer co-extrusion casting equipment or film blowing equipment, melting and plasticizing at 200 ℃, filtering through a filter screen with the mesh number of 20/80/200/80/20, extruding through 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 the same amount of non-PCR raw material HTA 108 (manufacturer: Exxon Mobil chemical) having a melt index of 0.7g/10min at 190 ℃/2.16kg and a density of 0.961g/cm3。
Example 8
This example differs from example 1 only in that no odor eliminating agent was included in the raw materials for the preparation of the PCR polyethylene, and the mass percentage of the low density polyethylene was 38.5%.
Example 9
This example is different from example 1 only in that the number of meshes of the filter used in the filtration in the preparation method of PCR polyethylene was 20/80/80/20.
Example 10
The difference between this example and example 3 is only that, in the raw materials for preparing the outer layer and the inner layer, the mass percent of the PCR polyethylene is 15%, and the mass percent of the low density polyethylene is 60%.
Example 11
The difference between this example and example 3 is only 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 label film has a thickness of 70 μm.
The polyethylene label films of examples 1-11 and comparative example 1 were tested for performance by the following methods:
(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 points/m2: visual inspection is carried out, and a crystal point area card is used as a reference;
(5) and (3) smell test: placing in a glass bottle, placing in an oven at 40 deg.C for 30min, and taking out for odor test.
The results of the performance tests are shown in table 1.
TABLE 1
Figure BDA0003072847460000171
Figure BDA0003072847460000181
Where MD refers to the machine direction and CD refers to the cross-machine direction in the table.
As can be seen from Table 1, the polyethylene label films prepared in examples 1-6 have high transverse and longitudinal tensile elastic modulus (longitudinal: 610-2) The number is less than 10 (3-8), and the area is not more than 0.05mm2This indicates that the polyethylene label film has a low crystal point, and it can be seen through olfaction test that the polyethylene label film has almost no odor.
The results of example 1 and example 7 show that the performance difference of the polyethylene label films prepared in example 1 and example 7 is very small and the number of crystal points in example 1 is less, which indicates that the recycled material used as the raw material in the present invention does not reduce the performance of the polyethylene label film, and has low crystal point, which can achieve the purpose of environmental protection.
The polyethylene label film prepared in example 8 had a pungent odor compared to example 1.
The polyethylene label film prepared in example 9 has more crystal points compared to example 1, which indicates that the number of the filter mesh affects the number of crystal points of the product.
The polyethylene label film prepared in example 10 had a reduced transverse and longitudinal tensile elastic modulus and flexural stiffness compared to example 3.
The polyethylene label film prepared in example 11 had a slight increase in both the transverse and longitudinal tensile elastic modulus and the bending stiffness, but had a larger number of crystal points, compared to example 3.
The polyethylene label film prepared in comparative example 1 has a decreased transverse and longitudinal tensile elastic modulus and bending stiffness compared to example 1.
The applicant states that the present invention is illustrated by the above examples of the polyethylene label film of the present invention and the preparation method and application thereof, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (10)

1. The polyethylene label film is characterized by comprising an outer layer, a middle layer and an inner layer from top to bottom in sequence, and the thickness of the label film is 75-85 micrometers.
2. The polyethylene label film according to claim 1, wherein the layer thickness ratio of the outer layer, the intermediate layer and the inner layer is 1:2:1 to 1:3.5: 1.
3. The polyethylene label film according to claim 1 or 2, wherein the outer layer and the inner layer have the same formulation, and the preparation raw materials comprise the following components in percentage by mass:
Figure FDA0003072847450000011
preferably, 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.
4. The polyethylene label film according to claim 3, wherein the melt index of the PCR polyethylene in the outer layer, the middle layer and the inner layer is 0.8-6g/10min at 190 ℃/2.16kg, and the density of the PCR polyethylene is 0.955-0.965g/cm3；
Preferably, the melt index of the low-density polyethylene in the outer layer, the middle layer and the inner layer is 1-4g/10min at 190 ℃/2.16kg, and the density of the low-density polyethylene is 0.92-0.94g/cm3；
Preferably, the melt index of the metallocene polyethylene in the outer layer, the middle layer and the inner layer is 1-6g/10min at 190 ℃/2.16kg, and the density of the metallocene polyethylene is 0.94-0.965g/cm3；
Preferably, the processing aid in the outer and inner layers comprises an opening agent and PPA;
preferably, the mass ratio of the opening agent to PPA is 2: 1.
5. The polyethylene label film according to claim 3 or 4, wherein the raw materials for preparing the PCR polyethylene comprise the following components in percentage by mass:
Figure FDA0003072847450000021
6. the polyethylene label film according to claim 5, wherein the low density polyethylene has a melt index of 10-20g/10min at 190 ℃/2.16kg and a density of 0.92-0.94g/cm3；
Preferably, the antioxidants include antioxidant 1076 and antioxidant 168;
preferably, the mass ratio of the antioxidant 1076 to the antioxidant 168 is 4: 1;
preferably, the smell eliminating agent is a smell eliminating agent with a molecular sieve structure, preferably an achromatic color 1000622-K;
preferably, the processing aid is PPA.
7. The polyethylene label film according to any one of claims 3 to 6, wherein the PCR polyethylene is prepared by a method comprising:
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 carried out in a high speed mixer;
preferably, the rotation speed of the mixing is 500-;
preferably, the temperature of the melting is 170-200 ℃;
preferably, the mesh number of the filter screens used for filtering is set to 20/80/200/80/20.
8. The process for the preparation of polyethylene label film according to any of claims 1 to 7, characterized in that it 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 co-extrusion casting equipment or film blowing equipment, melting, plasticizing, filtering, extruding, cooling and shaping to obtain the polyethylene label film.
9. The method as claimed in claim 8, wherein the melting temperature is 180-210 ℃;
preferably, the mesh number of the filter screens used for filtering is set to 20/80/200/80/20.
10. Use of the polyethylene label film according to any one of claims 1 to 7 in a label.
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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992017539A1 (en) * 1991-03-29 1992-10-15 Bpi Environmental Inc. Polymeric material and clear film produced therefrom
JP2009172845A (en) * 2008-01-24 2009-08-06 Japan Polyethylene Corp Multilayer blow-molded article and its manufacturing method
CN102173160A (en) * 2010-12-29 2011-09-07 东莞市正新包装制品有限公司 Heavy-duty thermal shrinkage polyethylene film and preparation method thereof
CN102774110A (en) * 2012-07-13 2012-11-14 杭州德雅包装有限公司 Biaxially-oriented polyethylene shrink film and production technique thereof
CN104890334A (en) * 2015-06-12 2015-09-09 成都市益诚包装有限公司 High-temperature-resistant and creep-resistant polyethylene heat shrinkage film and film-blowing process thereof
CN109532177A (en) * 2018-12-28 2019-03-29 广东超维塑料薄膜有限公司 A kind of three-layer co-extruded polyethylene label film and preparation method thereof
CN109824925A (en) * 2019-01-09 2019-05-31 江阴宝柏包装有限公司 A kind of film and preparation method thereof using PCR-PE preparation
US20200299043A1 (en) * 2019-03-18 2020-09-24 C.L.P. Industries Ltd. Fully recyclable polyethylene packaging
CN112341686A (en) * 2020-10-24 2021-02-09 深圳市鹏展永晟实业有限公司 Environment-friendly cosmetic hose with high PCR content and manufacturing process thereof
WO2021074697A1 (en) * 2019-10-15 2021-04-22 Braskem S.A. Shrink films incorporating post-consumer resin and methods thereof

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992017539A1 (en) * 1991-03-29 1992-10-15 Bpi Environmental Inc. Polymeric material and clear film produced therefrom
JP2009172845A (en) * 2008-01-24 2009-08-06 Japan Polyethylene Corp Multilayer blow-molded article and its manufacturing method
CN102173160A (en) * 2010-12-29 2011-09-07 东莞市正新包装制品有限公司 Heavy-duty thermal shrinkage polyethylene film and preparation method thereof
CN102774110A (en) * 2012-07-13 2012-11-14 杭州德雅包装有限公司 Biaxially-oriented polyethylene shrink film and production technique thereof
CN104890334A (en) * 2015-06-12 2015-09-09 成都市益诚包装有限公司 High-temperature-resistant and creep-resistant polyethylene heat shrinkage film and film-blowing process thereof
CN109532177A (en) * 2018-12-28 2019-03-29 广东超维塑料薄膜有限公司 A kind of three-layer co-extruded polyethylene label film and preparation method thereof
CN109824925A (en) * 2019-01-09 2019-05-31 江阴宝柏包装有限公司 A kind of film and preparation method thereof using PCR-PE preparation
US20200299043A1 (en) * 2019-03-18 2020-09-24 C.L.P. Industries Ltd. Fully recyclable polyethylene packaging
WO2021074697A1 (en) * 2019-10-15 2021-04-22 Braskem S.A. Shrink films incorporating post-consumer resin and methods thereof
CN112341686A (en) * 2020-10-24 2021-02-09 深圳市鹏展永晟实业有限公司 Environment-friendly cosmetic hose with high PCR content and manufacturing process thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王建清，陈金周: "《包装材料学 第2版》", 28 February 2017, 北京：中国轻工业出版社 *

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