CN111070838A - Recyclable multilayer PE composite film and preparation method thereof - Google Patents

Recyclable multilayer PE composite film and preparation method thereof Download PDF

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CN111070838A
CN111070838A CN201911406490.4A CN201911406490A CN111070838A CN 111070838 A CN111070838 A CN 111070838A CN 201911406490 A CN201911406490 A CN 201911406490A CN 111070838 A CN111070838 A CN 111070838A
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layer
composite film
raw materials
inner layer
outer layer
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冯志伟
鲜志德
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CHENGDE TECHNOLOGY CO LTD
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CHENGDE TECHNOLOGY CO LTD
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0625—LLDPE, i.e. linear low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a recyclable multilayer PE composite film and a preparation method thereof, wherein the recyclable multilayer PE composite film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials: LLDPE7042, LDPE2420H, MLLDPESP 1520; the middle layer is composed of the following raw materials: LDPE2426H, LLDPE2045, MLLDPESP 0510; the inner layer is composed of the following raw materials: LLDPESP2020, MLLDPESP0510, an EAZ-10 as a mouth-opening agent and an ESQ-4 as a slipping agent. The recyclable multilayer PE composite film prepared by the invention can be subjected to low-temperature heat sealing after being printed and solvent-free compounded by a printer, and has the characteristics of freezing resistance, falling resistance and high transparency.

Description

Recyclable multilayer PE composite film and preparation method thereof
Technical Field
The invention relates to the technical field of PE films, in particular to a recyclable multilayer PE composite film and a preparation method thereof.
Background
Compared with polypropylene films, polyester films and polyvinyl chloride films, the PE film has the characteristics of low cost, good flexibility and excellent heat sealing performance and longitudinal and transverse performances; and the PE film can be aluminized and printed after corona treatment, and is compounded with other materials to obtain a composite film with better performance,
the PE film is widely applied to the packaging of food and daily necessities, and the portable bags for commercial super goods in the market are usually made of the PE film. The PET12/PE opal 120-150 mu m is also used in some markets, but the PET12/PE opal 120-150 mu m is easy to break the package in the aspect of falling, particularly under the condition that the temperature is lower than zero in winter in the north, the PET12/PE opal 120-150 mu m is brittle, and the package breaking rate is higher; PA15/PE opal 100-; in addition, the film products produced by the two materials can not be recycled, and the waste of resources is serious.
Therefore, in order to solve the above problems, the present invention provides a recyclable multilayer PE composite film made of a single material, which is easy to mass-produce, resistant to low temperature and freezing, resistant to dropping, and heat-sealable at low temperature.
Chinese patent CN101480861B discloses a PE film, which is formed by co-extruding an outer layer, a middle layer and an inner layer; the thickness ratio of the outer layer, the middle layer and the inner layer is 1 +/-0.3: 1 ± 0.3: 1 plus or minus 0.3; the outer layer is prepared from the following raw materials in percentage by weight of 1: 1-1: 8 of low density polyethylene and linear low density polyethylene, wherein the raw materials of the middle layer are 1: 0.2-1: 10, the inner layer is prepared from the following raw materials in a weight ratio of 100: 100: 2-100: 10: 1, metallocene linear low density polyethylene and a die opener. The middle layer is modified by polypropylene, and the metallocene linear low-density polyethylene is added into the middle layer and the inner layer, so that the film has better heat sealing performance, molecular chains of the modified PE film form a spatial three-dimensional configuration, and the molecular density is increased, thereby achieving the purpose of preventing oil molecules from permeating, and enabling the PE film of the invention to have good oil-separating function.
Chinese patent CN104476889B discloses a PE film, which is formed by co-extruding a corona layer, a middle layer and an inner layer, wherein the corona layer comprises metallocene linear low-density polyethylene resin and medium-density polyethylene resin; the middle layer comprises low-density polyethylene resin, linear low-density polyethylene resin and medium-density polyethylene resin; the inner layer comprises metallocene linear low density polyethylene resin and medium density polyethylene resin. The corona layer and the inner layer both comprise metallocene linear low-density polyethylene resin with high proportion, so that the film has better heat sealing performance, and the medium-density polyethylene resin added in the corona layer, the middle layer and the inner layer enables the film to have better stiffness and flexibility, so that the PE film is suitable for being used as a sanitary product package.
Disclosure of Invention
The invention aims at the problems and provides a recyclable multilayer PE composite film and a preparation method thereof.
The technical scheme adopted by the invention for solving the problems is as follows: the recyclable multilayer PE composite film comprises an outer layer, a middle layer and an inner layer, wherein the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 50-70% of LLDPE7042, 15-25% of LDPE2420H and 15-25% of MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 25-55% of LDPE2426H, 15-25% of LLDPE2045 and 30-50% of MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 70-85% of MLLDPESP2020, 15-25% of MLLDPESP0510, 1-2.5% of an opening agent EAZ-10 and 1-2.5% of a slipping agent ESQ-4.
Further, the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 60% LLDPE7042, 20% LDPE2420H, 20% MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 40% LDPE2426H, 20% LLDPE2045, 40% MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 77% of MLLDPESP2020, 20% of MLLDPESP0510, 1.5% of an opening agent EAZ-10 and 1.5% of a slipping agent ESQ-4.
Further, the outer layer, the middle layer and the inner layer are composed of the following components in a mass ratio of 2-3: 4-6: 2 to 3.
Furthermore, the outer layer, the middle layer and the inner layer are composed of the following components in a mass ratio of 2.5: 5: 2.5
Another object of the present invention is to provide a method for preparing a recyclable multilayer PE composite film, comprising the steps of:
step one, mixing materials: uniformly stirring the raw materials of the outer layer, the middle layer and the inner layer according to the mass percentage to respectively prepare an outer layer raw material, a middle layer raw material and an inner layer raw material for later use;
step two, batching: respectively loading the outer layer raw material, the middle layer raw material and the inner layer raw material obtained in the step one into a No. 1 hopper, a No. 2 hopper and a No. 3 hopper of a batching device for batching;
step three, blowing the film: and (3) plasticizing, extruding and blow molding by adopting a three-layer co-extrusion film blowing machine connected with the batching equipment in the step two to obtain the recyclable multilayer PE composite film, wherein the blow-up ratio is 2.5-4: 1.
further, in the first step, the stirring speed is 450-1250 revolutions per minute.
Further, in the third step, in the plasticizing and extruding process, the plasticizing temperature of the film blowing machine is 175-195 ℃, and the head temperature of the film blowing machine is 165-175 ℃. The selection of the plasticizing temperature of the film blowing machine is proper, materials of each part can be fully mixed and plasticized, and the energy consumption and the cost are reduced.
Further, in the third step, in the blow molding process, the temperature of the cooling roller is 15-45 ℃.
The invention has the advantages that:
(1) the recyclable multilayer PE composite film prepared by the invention can be subjected to low-temperature heat sealing after being printed and solvent-free compounded by a printer, and has the characteristics of freezing resistance, falling resistance and high transparency;
(2) the recyclable multilayer PE composite film prepared by the invention realizes the preparation of single raw material, is convenient to recycle and has high recycling rate;
(3) the recyclable multilayer PE composite film prepared by the invention can be widely used for packaging foods, daily necessities, electronic products and the like, has excellent gas barrier properties such as water vapor and the like, and can also be used for packaging sanitary products;
(4) according to the recyclable multilayer PE composite film prepared by the invention, the batching equipment and the film blowing machine are used in a combined manner in the preparation process, so that the continuous production is realized, the mass production is easy, the cost is lower, and the recyclable multilayer PE composite film can be widely popularized.
Drawings
In order to more clearly illustrate the improvement of the recyclable multilayer PE composite films prepared in the embodiments 1-5 of the present invention, the following experimental examples are provided with the following figures and graphs showing the performance test results of the recyclable multilayer PE composite films prepared in the embodiments 1-5 of the present invention. In the drawings:
FIG. 1 is a comparison of the heat seal strength of recyclable multilayer PE composite films prepared in examples 1 to 5 of the present invention.
Detailed Description
The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.
Example 1
Recoverable multilayer PE composite film
The recyclable multilayer PE composite film comprises an outer layer, a middle layer and an inner layer, wherein the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 50% LLDPE7042, 25% LDPE2420H, 25% MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 25% LDPE2426H, 25% LLDPE2045, 50% MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 70% of MLLDPESP2020, 25% of MLLDPESP0510, 2.5% of an opening agent EAZ-10 and 2.5% of a slipping agent ESQ-4; wherein, the outer layer, the middle layer and the inner layer are composed of 2: 6: 3.
the preparation method comprises the following steps:
step one, mixing materials: uniformly stirring the raw materials of the outer layer, the middle layer and the inner layer according to the mass percentage at the speed of 450 revolutions per minute to respectively prepare an outer layer raw material, a middle layer raw material and an inner layer raw material for later use;
step two, batching: respectively loading the outer layer raw material, the middle layer raw material and the inner layer raw material obtained in the step one into a No. 1 hopper, a No. 2 hopper and a No. 3 hopper of a batching device for batching;
step three, blowing the film: and (3) plasticizing, extruding and blow molding by adopting a three-layer co-extrusion film blowing machine connected with the batching equipment in the step two to obtain the recyclable multilayer PE composite film, wherein the blow-up ratio is 2.5: 1.
in the plasticizing and extruding process, the plasticizing temperature of the film blowing machine is 175 ℃, and the head temperature of the film blowing machine is 165 ℃; the chill roll temperature was 15 ℃ during blow molding.
Example 2
Recoverable multilayer PE composite film
The recyclable multilayer PE composite film comprises an outer layer, a middle layer and an inner layer, wherein the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 70% LLDPE7042, 15% LDPE2420H, 15% MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 55% LDPE2426H, 15% LLDPE2045, 30% MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 85% of MLLDPESP2020, 15% of MLLDPESP0510, 2.5% of an opening agent EAZ-10 and 2.5% of a slipping agent ESQ-4; wherein, the outer layer, the middle layer and the inner layer are composed of the following components in mass ratio of 3: 4: 2.
the preparation method comprises the following steps:
step one, mixing materials: uniformly stirring the raw materials of the outer layer, the middle layer and the inner layer according to the mass percentage at the speed of 1250 revolutions per minute to respectively prepare an outer layer raw material, a middle layer raw material and an inner layer raw material for later use;
step two, batching: respectively loading the outer layer raw material, the middle layer raw material and the inner layer raw material obtained in the step one into a No. 1 hopper, a No. 2 hopper and a No. 3 hopper of a batching device for batching;
step three, blowing the film: and (3) plasticizing, extruding and blow molding by adopting a three-layer co-extrusion film blowing machine connected with the batching equipment in the step two to obtain the recyclable multilayer PE composite film, wherein the blow-up ratio is 4: 1.
in the plasticizing and extruding process, the plasticizing temperature of the film blowing machine is 195 ℃ and the head temperature of the film blowing machine is 175 ℃; the chill roll temperature was 45 ℃ during blow molding.
Example 3
Recoverable multilayer PE composite film
The recyclable multilayer PE composite film comprises an outer layer, a middle layer and an inner layer, wherein the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 55% LLDPE7042, 23% LDPE2420H, 22% MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 32% LDPE2426H, 23% LLDPE2045, 45% MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 75% of MLLDPESP2020, 23% of MLLDPESP0510, 1% of an opening agent EAZ-10 and 1% of a slipping agent ESQ-4; wherein, the outer layer, the middle layer and the inner layer are composed of 2: 6: 2.
the preparation method comprises the following steps:
step one, mixing materials: uniformly stirring raw materials of the outer layer, the middle layer and the inner layer according to the mass percentage at a speed of 650 revolutions per minute to respectively prepare an outer layer raw material, a middle layer raw material and an inner layer raw material for later use;
step two, batching: respectively loading the outer layer raw material, the middle layer raw material and the inner layer raw material obtained in the step one into a No. 1 hopper, a No. 2 hopper and a No. 3 hopper of a batching device for batching;
step three, blowing the film: and (3) plasticizing, extruding and blow molding by adopting a three-layer co-extrusion film blowing machine connected with the batching equipment in the step two to obtain the recyclable multilayer PE composite film, wherein the blow-up ratio is 3: 1.
in the plasticizing and extruding process, the plasticizing temperature of the film blowing machine is 180 ℃, and the temperature of the head of the film blowing machine is 168 ℃; the chill roll temperature was 25 ℃ during blow molding.
Example 4
Recoverable multilayer PE composite film
The recyclable multilayer PE composite film comprises an outer layer, a middle layer and an inner layer, wherein the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 65% LLDPE7042, 18% LDPE2420H, 17% MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 47% LDPE2426H, 18% LLDPE2045, 35% MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 82% of MLLDPESP2020, 16% of MLLDPESP0510, 1% of an opening agent EAZ-10 and 1% of a slipping agent ESQ-4; wherein, the outer layer, the middle layer and the inner layer are composed of the following components in mass ratio of 3: 4: 3.
the preparation method comprises the following steps:
step one, mixing materials: uniformly stirring the raw materials of the outer layer, the middle layer and the inner layer according to the mass percentage at a speed of 1050 revolutions per minute to respectively prepare an outer layer raw material, a middle layer raw material and an inner layer raw material for later use;
step two, batching: respectively loading the outer layer raw material, the middle layer raw material and the inner layer raw material obtained in the step one into a No. 1 hopper, a No. 2 hopper and a No. 3 hopper of a batching device for batching;
step three, blowing the film: and (3) plasticizing, extruding and blow molding by adopting a three-layer co-extrusion film blowing machine connected with the batching equipment in the step two to obtain the recyclable multilayer PE composite film, wherein the blow-up ratio is 3.5: 1.
in the plasticizing and extruding process, the plasticizing temperature of the film blowing machine is 190 ℃, and the temperature of the head of the film blowing machine is 172 ℃; the chill roll temperature was 35 ℃ during blow molding.
Example 5
Recoverable multilayer PE composite film
The recyclable multilayer PE composite film comprises an outer layer, a middle layer and an inner layer, wherein the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 60% LLDPE7042, 20% LDPE2420H, 20% MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 40% LDPE2426H, 20% LLDPE2045, 40% MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 77% of MLLDPESP2020, 20% of MLLDPESP0510, 1.5% of an opening agent EAZ-10 and 1.5% of a slipping agent ESQ-4; wherein, the outer layer, the middle layer and the inner layer are composed of 2.5 mass ratio: 5: 2.5.
the preparation method comprises the following steps:
step one, mixing materials: uniformly stirring the raw materials of the outer layer, the middle layer and the inner layer according to the mass percentage at the speed of 850 revolutions per minute to respectively prepare an outer layer raw material, a middle layer raw material and an inner layer raw material for later use;
step two, batching: respectively loading the outer layer raw material, the middle layer raw material and the inner layer raw material obtained in the step one into a No. 1 hopper, a No. 2 hopper and a No. 3 hopper of a batching device for batching;
step three, blowing the film: and (3) plasticizing, extruding and blow molding by adopting a three-layer co-extrusion film blowing machine connected with the batching equipment in the step two to obtain the recyclable multilayer PE composite film, wherein the blow-up ratio is 3: 1.
in the plasticizing and extruding process, the plasticizing temperature of the film blowing machine is 185 ℃, and the temperature of the head of the film blowing machine is 170 ℃; the chill roll temperature was 40 ℃ during blow molding.
Examples of the experiments
The tensile strength and tensile elongation at break of the recyclable multilayer PE composite films prepared in examples 1 to 5 were measured according to GB/T1040.3-2006, respectively; the heat-seal strength of the recyclable multilayer PE composite films obtained in examples 1 to 5 was measured according to QBT2358-1998Q, wherein the heat-seal temperature was 110 ℃ and the heat-seal pressure was 0.15 MPa. Further illustrating the advancement of the recyclable multilayer PE composite film of the present invention.
The statistics of the test results are shown in table 1:
TABLE 1 Performance results for recyclable multilayer PE composite films prepared in inventive examples 1-5
Figure BDA0002348772640000081
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The recyclable multilayer PE composite film is composed of an outer layer, a middle layer and an inner layer, and is characterized in that the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in percentage by mass: 50-70% of LLDPE7042, 15-25% of LDPE2420H and 15-25% of MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 25-55% of LDPE2426H, 15-25% of LLDPE2045 and 30-50% of MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 70-85% of MLLDPESP2020, 15-25% of MLLDPESP0510, 1-2.5% of an opening agent EAZ-10 and 1-2.5% of a slipping agent ESQ-4.
2. The recyclable multilayer PE composite film according to claim 1, wherein the outer layer of the recyclable multilayer PE composite film is composed of the following raw materials in mass percent: 60% LLDPE7042, 20% LDPE2420H, 20% MLLDPESP 1520; the middle layer is composed of the following raw materials by mass percent: 40% LDPE2426H, 20% LLDPE2045, 40% MLLDPESP 0510; the inner layer is composed of the following raw materials in percentage by mass: 77% of MLLDPESP2020, 20% of MLLDPESP0510, 1.5% of an opening agent EAZ-10 and 1.5% of a slipping agent ESQ-4.
3. The recyclable multilayer PE composite film as claimed in claim 1, wherein the outer layer, the middle layer and the inner layer are composed of 2-3 mass ratio: 4-6: 2 to 3.
4. The recyclable multilayer PE composite film according to claim 3, wherein the outer layer, the middle layer and the inner layer are formed by mixing 2.5: 5: 2.5.
5. a method for preparing the recyclable multilayer PE composite film according to any one of claims 1 to 4, comprising the steps of:
step one, mixing materials: uniformly stirring the raw materials of the outer layer, the middle layer and the inner layer according to the mass percentage to respectively prepare an outer layer raw material, a middle layer raw material and an inner layer raw material for later use;
step two, batching: respectively loading the outer layer raw material, the middle layer raw material and the inner layer raw material obtained in the step one into a No. 1 hopper, a No. 2 hopper and a No. 3 hopper of a batching device for batching;
step three, blowing the film: and (3) plasticizing, extruding and blow molding by adopting a three-layer co-extrusion film blowing machine connected with the batching equipment in the step two to obtain the recyclable multilayer PE composite film, wherein the blow-up ratio is 2.5-4: 1.
6. the method according to claim 5, wherein in the first step, the stirring rate is 450 to 1250 revolutions per minute.
7. The preparation method according to claim 5, wherein in the third step, the plasticizing temperature of the film blowing machine is 175-195 ℃ and the head temperature of the film blowing machine is 165-175 ℃ in the plasticizing extrusion process.
8. The method according to claim 5, wherein in the third step, the cooling roller temperature during the blow molding process is 15 ℃ to 45 ℃.
CN201911406490.4A 2019-12-31 2019-12-31 Recyclable multilayer PE composite film and preparation method thereof Pending CN111070838A (en)

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Publication number Priority date Publication date Assignee Title
CN101959907A (en) * 2008-03-07 2011-01-26 埃克森美孚化学专利公司 High MIR linear polyethylenes and coextruded films made using such polyethylene
CN104512080A (en) * 2014-12-12 2015-04-15 浙江诚德包装有限公司 Low-temperature dropping resistant film and its application
CN104527188A (en) * 2014-12-12 2015-04-22 浙江诚德包装有限公司 Printable double-faced heat sealing film, preparation method and application thereof
US20190344551A1 (en) * 2016-07-08 2019-11-14 Constantia Pirk Gmbh & Co. Kg Recyclable Polyethylene Film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101959907A (en) * 2008-03-07 2011-01-26 埃克森美孚化学专利公司 High MIR linear polyethylenes and coextruded films made using such polyethylene
CN104512080A (en) * 2014-12-12 2015-04-15 浙江诚德包装有限公司 Low-temperature dropping resistant film and its application
CN104527188A (en) * 2014-12-12 2015-04-22 浙江诚德包装有限公司 Printable double-faced heat sealing film, preparation method and application thereof
US20190344551A1 (en) * 2016-07-08 2019-11-14 Constantia Pirk Gmbh & Co. Kg Recyclable Polyethylene Film

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