CN110182464B - PE easy-to-tear packaging film and preparation method thereof - Google Patents
PE easy-to-tear packaging film and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
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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
- B32B27/06—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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Laminated Bodies (AREA)
Abstract
The invention relates to a PE easy-tear packaging film and a preparation method thereof, wherein the PE easy-tear packaging film comprises an outer layer, a middle layer and an inner layer which are sequentially stacked, wherein the outer layer comprises the following components in parts by weight: 20-40 parts of low-density polyethylene, 40-60 parts of linear polyethylene and 15-25 parts of metallocene polypropylene, wherein the middle layer comprises the following components in parts by weight: 10-30 parts of low-density polyethylene, 10-30 parts of high-density polyethylene and 40-80 parts of linear polyethylene, wherein the inner layer comprises the following components in parts by weight: 30-50 parts of low-density polyethylene, 15-35 parts of linear polyethylene and 25-45 parts of metallocene polypropylene. The product has the characteristics of easy tearing, no odor and no odor, and meets the technical requirements of national environmental protection standards and food standards.
Description
Technical Field
The invention relates to the field of PE films, in particular to a PE easy-to-tear packaging film and a preparation method thereof.
Background
The small bag-packed coffee packaging bag usually adopts the traditional printing process of easily tearing the packaging film, this kind of traditional printing process of easily tearing the packaging film adopts PT structure more, perhaps single copper paper, because PT (cellophane) and single copper paper have easily tearing nature and printability by itself, make whole complex film have printing pattern and the characteristic that can easily tear, but adopt cellophane and single copper paper as the structure cost of easily tearing the packaging film printing material of selecting is higher, especially the manufacturing of cellophane relates to environmental protection problem and great production technology technical difficulty, the soft-packing trade of china all relies on the import to high-quality cellophane at present, so that the manufacturing cost of cellophane remains high throughout.
The PE film has multiple advantages of no toxicity, no smell, good toughness and the like, and the easy-to-tear film based on the PE has wide prospects in the field of packaging. For example:
chinese patent application CN107629281A discloses a longitudinal easy-to-tear film, which is composed of 40-50% of low density polyethylene, 20-30% of linear low density polyethylene, 5-10% of polyethylene wax, 10-20% of ethylene-vinyl acetate copolymer and 5-10% of polybutene by mass percentage. According to the scheme, the PE is modified by adopting the ethylene-vinyl acetate copolymer and the polybutylene, so that the characteristic of easy longitudinal tearing is obtained, but the mechanical strength is not high, and the PE is not suitable for packaging particles and food with an edge structure.
Disclosure of Invention
The invention aims to solve the problem of overcoming the defects in the prior art and provides a PE easy-to-tear packaging film and a preparation method thereof.
The PE easy-tear packaging film comprises an outer layer, a middle layer and an inner layer which are sequentially stacked, and is prepared by adopting a three-layer co-extrusion process, wherein the outer layer and the inner layer are improved in easy-tear performance by introducing metallocene polypropylene, and the middle layer is designed for improving strength and toughness through a formula.
The specific scheme is as follows:
the PE easy-tear packaging film comprises an outer layer, a middle layer and an inner layer which are sequentially stacked, wherein the outer layer comprises the following components in parts by weight: 20-40 parts of low-density polyethylene, 40-60 parts of linear polyethylene and 15-25 parts of metallocene polypropylene, wherein the middle layer comprises the following components in parts by weight: 10-30 parts of low-density polyethylene, 10-30 parts of high-density polyethylene and 40-80 parts of linear polyethylene, wherein the inner layer comprises the following components in parts by weight: 30-50 parts of low-density polyethylene, 15-35 parts of linear polyethylene and 25-45 parts of metallocene polypropylene.
Further, the outer layer comprises the following components in parts by weight: 30 parts of low-density polyethylene, 50 parts of linear polyethylene and 20 parts of metallocene polypropylene.
Further, the middle layer comprises the following components in parts by weight: 20 parts of low-density polyethylene, 20 parts of high-density polyethylene and 60 parts of linear polyethylene.
Further, the inner layer comprises the following components in parts by weight: 40 parts of low-density polyethylene, 25 parts of linear polyethylene and 35 parts of metallocene polypropylene.
Further, the mass ratio of the outer layer, the middle layer and the inner layer is 1: 2: 1.
further, the low-density polyethylene in the outer layer has a melt index of 2.5-3.5g/min and a density of 0.925-0.935g/cm3(ii) a The linear polyethylene in the outer layer is ultrahigh molecular weight polyethylene with molecular weight of 10-20 ten thousand and density of 0.92-0.93g/cm3(ii) a The melt index of the metallocene polypropylene in the outer layer is 9.0-10.0 g/min.
Further, the low density polyethylene in the middle layer has a melt index of 2.5-3.5g/min and a density of 0.925-0.935g/cm3(ii) a The high density polyethylene in the middle layer has a melt index of 7.0-7.6g/min and a density of 0.945-0.955g/cm3(ii) a The linear polyethylene in the middle layer is ultrahigh molecular weight polyethylene with molecular weight of 10-20 ten thousand and density of 0.92-0.93g/cm3。
Further, the low density polyethylene in the inner layer has a melt index of 2.5-3.5g/min and a density of 0.925-0.935g/cm3(ii) a The linear polyethylene in the inner layer is ultrahigh molecular weight polyethylene with molecular weight of 10-20 ten thousand and density of 0.92-0.93g/cm3(ii) a The melt index of the metallocene polypropylene in the inner layer is 9.0-10.0 g/min.
The invention also provides a preparation method of the PE easy-tear packaging film, which comprises the following steps:
step 1: weighing the raw materials according to the weight parts, and mixing the raw materials according to respective formulas of the outer layer, the middle layer and the inner layer to respectively obtain an outer layer mixed material, a middle layer mixed material and an inner layer mixed material;
step 2: respectively adding the outer layer mixed material, the middle layer mixed material and the inner layer mixed material into three hoppers of an extruder, and carrying out three-layer co-extrusion film blowing treatment to obtain a film;
and step 3: and cooling and rolling the film to obtain the PE easy-tear packaging film.
Further, the temperature of the extruder in step 2 was 150 ℃ and 185 ℃.
Has the advantages that: the PE easy-to-tear packaging film provided by the invention utilizes the property difference between polyethylene and metallocene polypropylene to enable the outer layer and the inner layer of the product to easily form easy-to-tear notches, and the middle layer of the bonding material is improved in strength, so that the PE easy-to-tear packaging film can be torn straight along the notches by bare hands, has an easy-to-tear characteristic, and avoids the use of any cutting tool when the package is opened.
Furthermore, the PE easy-to-tear packaging film disclosed by the invention has moderate overall strength and toughness on the basis of the outer layer structure and the inner layer structure through the formula design of the middle layer, and meets the packaging requirements of coffee bags. The product adopts environment-friendly raw materials, all meets the requirements of food grade, is tasteless and odorless, and meets the technical requirements of national environment-friendly standards and food standard products.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
The low density polyethylene used in the examples had a melt index of 2.5-3.5g/min and a density of 0.925-0.935g/cm3Preferably, the melt index is 2.8g/min and the density is 0.932g/cm3(ii) a The linear polyethylene is ultrahigh molecular weight polyethylene, has a molecular weight of 10-20 ten thousand and a density of 0.92-0.93g/cm3Preferably, the molecular weight is 16 ten thousand and the density is 0.924g/cm3(ii) a The high density polyethylene has a melt index of 7.0-7.6g/min and a density of 0.945-0.955g/cm3Preferably, the melt index is 7.3g/min and the density is 0.947g/cm3(ii) a The metallocene polypropylene has a melt index of 9.0 to 10.0g/min, preferably a melt index of 9.5 g/min.
Example 1
Preparing a PE easy-to-tear packaging film, which comprises the following steps;
step 1: weighing the raw materials according to the table 1, and mixing the raw materials according to respective formulas of the outer layer, the middle layer and the inner layer to respectively obtain an outer layer mixed material, a middle layer mixed material and an inner layer mixed material;
step 2: respectively adding the outer layer mixed material, the middle layer mixed material and the inner layer mixed material into three hoppers of an extruder, and performing blow molding according to a conventional three-layer co-extrusion process after the temperature of the extruder is 160 ℃ to obtain a film, wherein the thicknesses of the outer layer, the middle layer and the inner layer are 0.03mm, 0.06mm and 0.03mm respectively;
and step 3: and cooling and rolling the film to obtain the PE easy-tear packaging film.
TABLE 1 dosage of raw materials/part by weight
Example 2
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1 except that the temperature of the extruder in step 2 is 150 ℃.
Example 3
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1.
Example 4
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1 except that the temperature of the extruder in step 2 is 180 ℃.
Example 5
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1 except that the temperature of the extruder in step 2 is 185 ℃.
Example 6
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1.
Comparative example 1
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1.
Comparative example 2
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1.
Comparative example 3
The amounts of the respective raw materials are shown in Table 1, and the preparation method is the same as that of example 1.
Performance testing
The prepared samples were subjected to a packaging test and tensile properties were tested using the film tensile properties test method of GB 13022-1991.
The test results are shown in Table 2.
TABLE 2 Performance test Table
As can be seen from table 2, the PE easy tear packaging film according to the present invention has easy tear characteristics, thereby avoiding the use of any cutting tool when opening the package. And the strength and the toughness are moderate, and the packaging requirement of the coffee bag is met. The product adopts environment-friendly raw materials, all meets the requirements of food grade, is tasteless and odorless, and meets the technical requirements of national environment-friendly standards and food standard products.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
1. The utility model provides a PE easily tears packaging film which characterized in that: the composite material comprises an outer layer, a middle layer and an inner layer which are sequentially stacked, wherein the outer layer comprises the following components in parts by weight: 20-40 parts of low-density polyethylene, 40-60 parts of linear polyethylene and 15-25 parts of metallocene polypropylene, wherein the middle layer comprises the following components in parts by weight: 10-30 parts of low-density polyethylene, 10-30 parts of high-density polyethylene and 40-80 parts of linear polyethylene, wherein the inner layer comprises the following components in parts by weight: 30-50 parts of low-density polyethylene, 15-35 parts of linear polyethylene and 25-45 parts of metallocene polypropylene; the low-density polyethylene in the outer layer has a melt index of 2.5-3.5g/min and a density of 0.925-0.935g/cm3(ii) a The linear polyethylene in the outer layer is ultrahigh molecular weight polyethylene with molecular weight of 10-20 ten thousand and density of 0.92-0.93g/cm3(ii) a The outer partThe metallocene polypropylene in the layer has a melt index of 9.0 to 10.0 g/min.
2. The PE easy-tear packaging film according to claim 1, wherein: the outer layer comprises the following components in parts by weight: 30 parts of low-density polyethylene, 50 parts of linear polyethylene and 20 parts of metallocene polypropylene.
3. The PE easy-tear packaging film according to claim 1, wherein: the middle layer comprises the following components in parts by weight: 20 parts of low-density polyethylene, 20 parts of high-density polyethylene and 60 parts of linear polyethylene.
4. The PE easy-tear packaging film according to claim 1, wherein: the inner layer comprises the following components in parts by weight: 40 parts of low-density polyethylene, 25 parts of linear polyethylene and 35 parts of metallocene polypropylene.
5. The PE easy-tear packaging film according to any one of claims 1-4, wherein: the mass ratio of the outer layer to the middle layer to the inner layer is 1: 2: 1.
6. the PE easy-tear packaging film according to any one of claims 1-4, wherein: the low density polyethylene in the middle layer has a melt index of 2.5-3.5g/min and a density of 0.925-0.935g/cm3(ii) a The high density polyethylene in the middle layer has a melt index of 7.0-7.6g/min and a density of 0.945-0.955g/cm3(ii) a The linear polyethylene in the middle layer is ultrahigh molecular weight polyethylene with molecular weight of 10-20 ten thousand and density of 0.92-0.93g/cm3。
7. The PE easy-tear packaging film according to any one of claims 1-4, wherein: the low density polyethylene in the inner layer has a melt index of 2.5-3.5g/min and a density of 0.925-0.935g/cm3(ii) a The linear polyethylene in the inner layer is ultrahigh molecular weight polyethylene with molecular weight of 10-20 ten thousand and density of 0.92-0.93g/cm3(ii) a The metallocene polypropylene in the inner layerThe melt index of the alkene is 9.0-10.0 g/min.
8. A method for preparing the PE easy-tear packaging film of any one of claims 1-7, characterized in that: the method comprises the following steps:
step 1: weighing the raw materials according to the parts by weight in the PE easy-to-tear packaging film of any one of claims 1 to 7, and mixing the raw materials according to respective formulas of the outer layer, the middle layer and the inner layer to obtain an outer layer mixed material, a middle layer mixed material and an inner layer mixed material respectively;
step 2: respectively adding the outer layer mixed material, the middle layer mixed material and the inner layer mixed material into three hoppers of an extruder, and carrying out three-layer co-extrusion film blowing treatment to obtain a film;
and step 3: and cooling and rolling the film to obtain the PE easy-tear packaging film.
9. The method for preparing the PE easy-tear packaging film according to claim 8, wherein the method comprises the following steps: the temperature of the extruder in step 2 was 150 ℃ and 185 ℃.
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| CN110182464A (en) | 2019-08-30 |
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