CN111100350B - Polyethylene composition, method of making the same, and packaging articles - Google Patents

Polyethylene composition, method of making the same, and packaging articles Download PDF

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CN111100350B
CN111100350B CN201811259056.3A CN201811259056A CN111100350B CN 111100350 B CN111100350 B CN 111100350B CN 201811259056 A CN201811259056 A CN 201811259056A CN 111100350 B CN111100350 B CN 111100350B
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polyethylene
component
polyethylene composition
composition according
components
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CN111100350A (en
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郑萃
姚雪容
施红伟
张韬毅
李娟�
刘宣伯
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/14—Gas barrier composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • 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
    • 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
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Abstract

The invention belongs to the field of polyolefin, and relates to a polyethylene composition, a preparation method thereof and a packaging product. The polyethylene composition comprises the following components: (1)10-80 wt% of polyethylene A component, (2)10-60 wt% of polyethylene B component, (3)10-70 wt% of polyethylene C component, and (4)0.01-3 wt% of organic volatile molecule V. The polyethylene package of the present invention has significantly higher barrier properties to volatile organic small molecules without loss of processability.

Description

Polyethylene composition, method of making the same, and packaging articles
Technical Field
The present invention is in the field of polyolefins, and more particularly, to a polyethylene composition, a method of producing the polyethylene composition, and a packaging article made from the polyethylene composition.
Background
Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. The polyethylene is odorless, nontoxic, has wax-like hand feeling, excellent low-temperature resistance and good chemical stability, and can resist corrosion of most of acid and alkali.
The polyethylene material has low cost, mature process conditions with large latitude and excellent low-temperature toughness, so the polyethylene material is widely applied in the field of packaging. In the packaging of goods such as food, medicine and cosmetics, polyethylene-based packaging generally suffers from insufficient barrier properties. Since food, medicine and cosmetics generally have volatile organic small molecules including flavor and effective medicinal components, the barrier property of polyethylene materials against these organic small molecules is poor. These volatile active pharmaceutical ingredients or flavor molecules can permeate the polyethylene packaging too quickly, resulting in a reduced shelf life of the product. The blocking of the packaging material to such volatile substances which are solid at normal temperature is different from the response law of the blocking of non-solid micromolecules such as conventional oxygen, water, carbon dioxide and the like at normal temperature, and the law of the traditional high-blocking material cannot be directly applied.
With respect to this problem, there are two main solutions on the market today, one is to use polyester packaging with better barrier properties, such as patent document 201510246432.5, and the other is to make a multilayer composite structure with polyethylene and high barrier material (such as ethylene-vinyl alcohol copolymer EVOH), such as patent document 201010272351. X. However, for the former, the polyester material is easy to contain water-soluble small molecules to pollute the product, and cannot meet the increasingly high requirements of users on the product; in the latter case, the multi-layer structure greatly increases the complexity of the manufacturing process.
Therefore, it is a better solution to provide a high-barrier polyethylene composition material for odor small molecules.
Disclosure of Invention
The object of the present invention is to overcome the above mentioned drawbacks of polyethylene packages and to provide a polyethylene composition, a process for the preparation of such a polyethylene composition and a packaging article made of such a polyethylene composition. Compared with the traditional low-density polyethylene packaging product, the barrier property of the packaging product to volatile organic micromolecules can be improved by about 10 times.
The first aspect of the invention provides a polyethylene composition comprising the following components:
(1)10 to 80 weight percent of a polyethylene A component, based on the total weight of component (1) to component (4); wherein the polyethylene A component contains one or more polyethylene resins An with the following parameters, the polymerization pressure of the polyethylene resin An is less than 150MPa, the polymerization temperature is less than 200 ℃, the comonomer is selected from one or more of propylene, 1-butene, 1-hexene and 1-octene, and the comonomer content is 0-2 mol%;
(2)10 to 60wt% of a polyethylene B component, based on the total weight of components (1) to (4); wherein the polyethylene B component contains one or more polyethylene resins Bn with the following parameters, the polymerization pressure of the polyethylene resin Bn is less than 150MPa, the polymerization temperature is less than 200 ℃, the comonomer is selected from propylene and/or 1-butylene, and the comonomer content is 0.5-5 mol%;
(3)10 to 70wt% of a polyethylene C component, based on the total weight of components (1) to (4); wherein the polyethylene C component contains one or more polyethylene resins Cn with the following parameters, the polymerization pressure of the polyethylene resin Cn is more than 150MPa, the polymerization temperature is more than 200 ℃, and no comonomer is contained;
(4)0.01 to 3 wt.%, based on the total weight of components (1) to (4), of organic volatile molecules V; wherein the molecular weight of the organic volatile molecule V is 80-2000.
In the polyethylene component of the present invention, "comonomer" means a monomer copolymerized with an ethylene monomer, and the "comonomer content" is calculated on the basis of the total amount of all monomers, including the ethylene monomer and the comonomer copolymerized therewith.
Further preferably, the content of the polyethylene A component is 10 to 60wt%, preferably 15 to 35wt%, and further preferably 20 to 30wt%, based on the total weight of the components (1) to (4); the polymerization pressure of the polyethylene resin An is preferably less than 100MPa, more preferably less than 50MPa, and still more preferably less than 20 MPa; the polymerization temperature is preferably less than 150 ℃, and more preferably less than 100 ℃; the comonomer content is preferably from 0.01 to 2mol%, preferably from 0.5 to 1.5 mol%.
Further preferably, the content of the polyethylene B component is 12 to 30wt%, further preferably 15 to 25 wt%, based on the total weight of the components (1) to (4); the polymerization pressure of the polyethylene resin Bn is preferably less than 100MPa, more preferably less than 50MPa, and still more preferably less than 20 MPa; the polymerization temperature is preferably less than 150 ℃ and more preferably less than 100 ℃.
Further preferably, the content of the polyethylene C component is 35 to 60wt%, further preferably 40 to 55 wt%, based on the total weight of the components (1) to (4).
Further preferably, the content of the organic volatile molecule V is 0.1 to 2% by weight, further preferably 0.5 to 1.5% by weight, based on the total weight of the components (1) to (4).
According to the present invention, preferably, the density of the polyethylene resin An is 0.950 to 0.970g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.05 and 40; the density of the polyethylene resin Bn is 0.910-0.940g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.10 and 40; the density of the polyethylene resin Cn is 0.890-0.930g/cm 3 And a melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.10 and 40.
The specific choice of the individual polyethylene components can be adjusted for different uses, according to a preferred embodiment of the invention, the polyethylene resin An has a melt index, measured at 190 ℃ under a load of 2.16kg, of from 4.0 to 15; the polyethylene resin Bn has a melt index of 0.5-7.0 measured at 190 ℃ under a load of 2.16 kg; the polyethylene resin Cn has a melt index of 0.5 to 4.0 measured at 190 ℃ under a load of 2.16 kg. Further preferably, the density of the polyethylene resin An is 0.952-0.965g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 6.0 and 12; the density of the polyethylene resin Bn is 0.915-0.938g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.8 and 5.0; the density of the polyethylene resin Cn is 0.910-0.925g/cm 3 And a melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.7 and 3.0.
According to the invention, the organic volatile molecule V preferably has a molecular weight of 90 to 1000. The organic volatile molecule is preferably sparingly soluble or insoluble in water, with a boiling point of 120-. Preferably, the organic volatile molecule V has an unsaturation degree of 1 or more, i.e., may be an alkenyl-containing molecule or a cyclic molecule.
In particular, the organic volatile molecule V meeting the above requirements may be selected from one or more of 1, 8-limonene, 1,7, 7-trimethylbicyclo [2.2.1] heptan-2-one, 2-isopropyl-5-methylcyclohexanol and 1,7, 7-trimethylbicyclo [2.2.1] -2-heptanol.
According to one embodiment of the present invention, the organic volatile molecule V may be, in addition to the above-mentioned compounds, various organic volatile components derived from foods, medicines or cosmetics or derivatives thereof. The organic volatile molecules are, for example, odor molecules.
According to the invention, the polyethylene composition also preferably contains 0 to 2wt%, based on the total weight of components (1) to (5), of component (5) additive X; further preferably, the additive X is contained in an amount of 0.1 to 1.5wt% based on the total weight of the components (1) to (5).
The additive X includes, but is not limited to, an antioxidant and/or a nucleating agent. The antioxidant and nucleating agent used in the present invention may be various antioxidants and nucleating agents which are conventional in the art, and the relative amounts thereof may be determined according to the amounts conventionally used in the art and adjusted as needed, and the present invention is not particularly limited thereto.
The antioxidant can be one or more of hindered phenol antioxidant, phosphite antioxidant and pentaerythritol ester antioxidant, and preferably, the antioxidant is hindered phenol antioxidant and/or phosphite antioxidant. Specifically, the hindered phenol antioxidant is as follows: antioxidant 1010 (pentaerythrityl tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], antioxidant 1076 (N-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate), antioxidant 1098(N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine), and antioxidant 3114(1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid). Phosphite antioxidants such as: antioxidant 168 (tris (2, 4-di-tert-butylphenol) phosphite), antioxidant 626 (bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite). The hindered phenol antioxidant and the phosphite antioxidant can be used in combination, and the weight ratio of the hindered phenol antioxidant to the phosphite antioxidant is preferably 1: (1-6).
The nucleating agent can be an organic salt nucleating agent and/or an inorganic salt nucleating agent, and preferably, the nucleating agent is an organic salt nucleating agent, such as NP-508 nucleating agent of Zhongda chemical industry.
According to a preferred embodiment of the invention, the polyethylene composition further comprises component (6) polyethylene D component in an amount of 0 to 97% by weight, based on the total weight of components (1) to (6); preferably, the polyethylene D component is present in an amount of from 0 to 25 wt%, based on the total weight of component (1) to component (6); further preferably, the polyethylene D component is present in an amount of 1 to 15wt%, based on the total weight of component (1) to component (6); more preferably, the polyethylene D component is present in an amount of 5 to 12 wt%, based on the total weight of component (1) to component (6);
the polyethylene D component contains one or more polyethylene resins Dn with the following parameters, the comonomer of the polyethylene resin Dn is selected from one or more of propylene, 1-butene, 1-hexene and 1-octene, and the comonomer content is 5-95 mol%; preferably, the comonomer of the polyethylene resin Dn is selected from one or more of propylene, 1-butene and 1-octene, and the comonomer content is 5-20 mol% or 80-95 mol%. The polyethylene resin Dn having a comonomer content within the above-mentioned preferred range is more advantageous in promoting the compatibility of the components.
Further preferably, the density of the polyethylene resin Dn is 0.830-0.920g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.5 and 20; preferably, the density of the polyethylene resin Dn is 0.840-0.910g/cm 3 And a melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.8 and 10.
According to a preferred embodiment of the present invention, the polyethylene composition further comprises component (7) polyethylene E component in an amount of 0.1 to 30wt%, based on the total weight of components (1) to (7); preferably, the polyethylene E component is present in an amount of from 0.2 to 20% by weight, based on the total weight of components (1) to (7); further preferably, the polyethylene E component is present in an amount of from 0.5 to 10% by weight, based on the total weight of components (1) to (7);
wherein the intrinsic viscosity of the polyethylene E component is 2000-5000 as tested according to ISO 1628-3; preferably, the polyethylene E component has an intrinsic viscosity of 3000 and 4500 as measured according to ISO 1628-3.
In the present invention, various polyethylene resins can be prepared or commercially available, and the source thereof is not particularly limited as long as the above parameter requirements are satisfied.
The second aspect of the present invention provides a method for preparing the above-mentioned polyethylene composition, which comprises the steps of stirring and mixing the components, melt blending, extruding, cooling and granulating to obtain the polyethylene composition.
The present invention is not particularly limited to specific conditions for each step in the above-described production method, and the production can be carried out according to the procedures and conditions which are conventional in the art. Specifically, the temperature of the melt blending extrusion may be 150 ℃ to 270 ℃, preferably 170 ℃ to 240 ℃.
A third aspect of the invention provides a packaging article made from the above polyethylene composition.
The packaging article may be at least one of a film article, a blister article, a blow molded article, and an extrusion molded article. The packaging article may be one of the types described above, or may be a multi-process formed composite packaging article. The method of making the packaging article may employ various processes conventional in the art.
The packaging article of the present invention may be used for food, pharmaceutical or cosmetic products. The packaging product can be an outer package or an inner package, and the specific shape of the packaging product is not limited to a bag shape or a bottle shape.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, one or more new ranges of values may be obtained from the combination of the endpoints of each range, the endpoints of each range and the individual values, and the individual values.
In the following examples and comparative examples, the melt index of polyethylene was measured on a model LMI melt index meter from Dynisco, the test temperature was 190 ℃ and the load, not otherwise specified, was 2.16 kg;
the density of the polyethylene was measured on a second quasi-technical MZ-A300 densitometer;
the microscopic chain structure of the polyethylene is measured by an AVANCE DRX 400MHz nuclear magnetic resonance spectrometer of Bruker company of Switzerland, and deuterated o-dichlorobenzene is used as a solvent;
the intrinsic viscosity of the polymer was measured using an Ubbelohde viscometer according to ISO 1628-3;
the composition of the polyethylene composition is determined by the batch size of the raw materials.
The present invention will be described in detail below by way of examples.
Example 1
This example illustrates the polyethylene composition and method of making the same provided by the instant invention.
Under stirring (stirring rate 90rpm for 5min), the following components were mixed: 54g of DGDA 2490BK (Dow chemical, USA, melt index of 7, density of 0.959g/mL, polymerization pressure of about 3MPa, polymerization temperature of about 80 ℃, comonomer of 1-hexene, comonomer content of 1 mol%), 36g of DNDB 7149 (Zhongpetrochemical Tianjin, melt index of 4, density of 0.934g/mL, polymerization pressure of about 4MPa, polymerization temperature of about 85 ℃, comonomer of 1-butene, comonomer content of 2.5 mol%), 90g of LD100BW (Zhongpetrochemical Yanshan petrochemical, melt index of 2.1, density of 0.923g/mL, polymerization pressure of about 200MPa, polymerization temperature of about 300 ℃), 20g of Versify 2400 (Dow chemical, melt index of 2, density of 0.859g/mL, comonomer of propylene, comonomer content of 87 mol%), 1.8g of 1, 8-terpene dienes (Shanghai Jiu Shih Co., Ltd.), 0.4g of antioxidant 168 (Nanjing Hualiming), 0.4g of antioxidant 1010 (Nanjing Hualiming) and 1.0g of nucleating agent NP-508 (Zhongda chemical industry) are fully mixed. Extruding and granulating the obtained mixture by a double-screw extruder, wherein the rotating speed of a screw is controlled to be 10rpm, the torque is 20N × m, and the temperature of each section from a feed inlet to an extrusion outlet in the double-screw extruder is 180 ℃, 200 ℃, 220 ℃ and 220 ℃ in sequence to obtain the polyethylene composition A1.
Example 2
This example illustrates the polyethylene composition and method of making the same provided by the instant invention.
Under stirring (stirring rate 90rpm for 5min), the following components were mixed: 50g of SH800U (medium petrochemical Shanghai petrochemical, melt index of 8, density of 0.964g/mL, polymerization pressure of 4MPa, polymerization temperature of 75 ℃, comonomer of 1-butene, comonomer content of 0.1 mol%), 45g of SP3010 (Japan Triwell, melt index of 4, density of 0.928g/mL, polymerization pressure of 5MPa, polymerization temperature of 85 ℃, comonomer of 1-butene, comonomer content of 3 mol%), 95g of LD104 (medium petrochemical Yanshan petrochemical, melt index of 1.95, density of 0.923g/mL, polymerization pressure of 220MPa, polymerization temperature of 290 g of Engage 8452 (Dow chemical, melt index of 3, density of 0.875g/mL, comonomer of 1-octene, comonomer content of 15 mol%), 1.8g of 1, 8-limonene (Shanghai nine orange terpene Co., Ltd.), 0.4g of antioxidant 168 (Nanjing Hualiming), 0.4g of antioxidant 1010 (Nanjing Hualiming) and 1.0g of nucleating agent NP-508 (Zhongda chemical industry) are fully mixed. Extruding and granulating the obtained mixture by a double-screw extruder, wherein the rotating speed of a screw is controlled to be 10rpm, the torque is 20N × m, and the temperature of each section from a feed inlet to an extrusion outlet in the double-screw extruder is 180 ℃, 200 ℃, 220 ℃ and 220 ℃ in sequence to obtain the polyethylene composition A2.
Example 3
This example illustrates the polyethylene composition and method of making the same provided by the instant invention.
Under stirring (stirring rate 90rpm for 5min), the following components were mixed: 45g of HDPE-1252 (Nexus Resin, U.S.A., melt index of 11, density of 0.952g/mL, polymerization pressure of about 3MPa, polymerization temperature of about 70 ℃, comonomer of 1-butene, comonomer content of 0.8 mol%), 45g of 9088 (orthopetrochemical, melt index of 0.8, density of 0.92g/mL, polymerization pressure of 3MPa, polymerization temperature of 70 ℃, comonomer of 1-butene, comonomer content of 4 mol%), 95g of 2426F (Shenhua Xinjiang, melt index of 0.75, density of 0.92g/mL, polymerization pressure of 290MPa, polymerization temperature of 310 ℃), 20g of Exact 8210 (Dow chemical, melt index of 10, density of 0.883g/mL, comonomer of 1-octene, comonomer content of 13 mol%), 5g of DB5305 g of 5305A (Tagumo U.S.S., inherent viscosity of 3300), 1.4g of 1, 8-terpene diene (Shanghai Jiuzui industry Co., Ltd.), 0.4g of antioxidant 168 (Nanjing Hualiming), 0.4g of antioxidant 1010 (Nanjing Hualiming), and 1.0g of nucleating agent NP-508 (Zhongda chemical industry) were mixed thoroughly. Extruding and granulating the obtained mixture by a double-screw extruder, wherein the rotating speed of a screw is controlled to be 10rpm, the torque is 20N × m, and the temperature of each section from a feed inlet to an extrusion outlet in the double-screw extruder is 180 ℃, 200 ℃, 220 ℃ and 220 ℃ in sequence to obtain the polyethylene composition A3.
Example 4
The same as in example 1, except that no Versify 2400 component was added. Polyethylene composition a4 was obtained.
Example 5
The same as in example 3 except that no DB5305A component was added. Polyethylene composition a5 was obtained.
Example 6
The same as in example 3, except that the HDPE-1252 component was present in an amount of 20 g. Polyethylene composition a6 was obtained.
Comparative example 1
Low density polyethylene N210 (medium petrochemical, Shanghai petrochemical, melt index 2.1, density 0.921g/mL) was used as comparative material D1.
Comparative example 2
High density polyethylene HDPE-1252 (U.S. Nexus Resin, melt index 11, density 0.952g/mL) was used as a comparative material D2.
Comparative example 3
Linear low density polyethylene 7042 (medium petrochemical and reduced maritime, melt index 2, density 0.918g/mL) was used as comparative material D3.
Test example
The various materials of the examples and comparative examples were prepared into 1mm thick, 3cm square multiple preforms, edge-melt heat sealed into cube containers, and sealed into 0.1g of menthol (a typical volatile drug). The package was placed in a 60 ℃ circulating air oven and tested for its weight loss effect after 120 hours. The average of 5 trials was taken. The smoothness of the formed container was also observed. The results are shown in Table 1.
TABLE 1
Numbering Weight loss after 120 h/mg Degree of smoothness
A1 3.84 Is smooth and smooth
A2 3.96 Is smooth and smooth
A3 4.01 Is smooth and smooth
A4 4.42 Is smooth and smooth
A5 4.37 Is smooth and smooth
A6 5.51 Is smooth and smooth
D1 39.5 Is smooth and smooth
D2 10.1 Is slightly rough
D3 32.3 Is smooth and smooth
From the above examples and comparative example data, it can be seen that the polyethylene packaging of the present invention has significantly higher barrier properties to volatile organic small molecules without loss of processability.
While embodiments of the present invention have been described above, the above description is illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (26)

1. A polyethylene composition, characterized in that the polyethylene composition comprises the following components:
(1)10 to 35 weight percent of a polyethylene A component, based on the total weight of components (1) through (4); wherein the polyethylene A component contains one or more of the following componentsThe polyethylene resin An has the parameters that the polymerization pressure of the polyethylene resin An is less than 150MPa, the polymerization temperature is less than 200 ℃, the comonomer is selected from one or more of propylene, 1-butene, 1-hexene and 1-octene, and the content of the comonomer is 0.1-2 mol%; the density of the polyethylene resin An is 0.952-0.970 g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of 4.0 to 15 g/10 min;
(2)10 to 30wt% of a polyethylene B component, based on the total weight of components (1) to (4); wherein the polyethylene B component contains one or more polyethylene resins Bn with the following parameters, the polymerization pressure of the polyethylene resin Bn is less than 150MPa, the polymerization temperature is less than 200 ℃, the comonomer is selected from propylene and/or 1-butylene, and the comonomer content is 0.5-5 mol%; the density of the polyethylene resin Bn is 0.910-0.940g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.5 and 7.0 g/10 min;
(3) 35 to 70wt% of a polyethylene C component, based on the total weight of components (1) to (4); wherein the polyethylene C component contains one or more polyethylene resins Cn with the following parameters, the polymerization pressure of the polyethylene resin Cn is more than 150MPa, the polymerization temperature is more than 200 ℃, and no comonomer is contained; the density of the polyethylene resin Cn is 0.890-0.930g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.5 and 4.0 g/10 min;
(4)0.01 to 3 wt.%, based on the total weight of components (1) to (4), of organic volatile molecules V; wherein the molecular weight of the organic volatile molecule V is 80-2000.
2. The polyethylene composition according to claim 1, wherein the polyethylene a component is present in an amount of 15 to 35wt%, the polyethylene B component is present in an amount of 12 to 30wt%, the polyethylene C component is present in an amount of 35 to 60wt%, and the organic volatile molecule V is present in an amount of 0.1 to 2wt%, based on the total weight of components (1) to (4).
3. The polyethylene composition of claim 1, which isWherein the density of the polyethylene resin An is 0.952-0.965g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of 6.0 to 12 g/10 min; the density of the polyethylene resin Bn is 0.915-0.938g/cm 3 A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.8 and 5.0 g/10 min; the density of the polyethylene resin Cn is 0.910-0.925g/cm 3 And a melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.7 and 3.0 g/10 min.
4. The polyethylene composition according to any of claims 1-3, wherein the organic volatile molecules V have a molecular weight of 90-1000, are sparingly soluble or insoluble in water and have a boiling point of 120-350 ℃.
5. The polyethylene composition according to claim 4, wherein the organic volatile molecules V have an unsaturation degree of 1 or more.
6. The polyethylene composition according to claim 4, wherein the organic volatile molecule V is selected from one or more of 1, 8-limonene, 1,7, 7-trimethylbicyclo [2.2.1] heptan-2-one, 2-isopropyl-5-methylcyclohexanol, and 1,7, 7-trimethylbicyclo [2.2.1] -2-heptanol.
7. Polyethylene composition according to any of claims 1 to 3, wherein the organic volatile molecules V are organic volatile components derived from food, pharmaceutical or cosmetic products or derivatives thereof.
8. The polyethylene composition according to any of claims 1 to 3, wherein the polyethylene composition further comprises from 0 to 2wt% of component (5) additive X, based on the total weight of components (1) to (5).
9. The polyethylene composition according to claim 8, wherein the additive X is present in an amount of 0.1 to 1.5wt%, based on the total weight of components (1) to (5).
10. The polyethylene composition according to claim 8, wherein the additive X is an antioxidant and/or a nucleating agent.
11. The polyethylene composition according to claim 10, wherein the antioxidant is one or more of hindered phenolic antioxidants, phosphite antioxidants and pentaerythritol antioxidants.
12. The polyethylene composition according to claim 10, wherein the nucleating agent is an organic salt-based nucleating agent and/or an inorganic salt-based nucleating agent.
13. The polyethylene composition according to any of claims 1 to 3, wherein the polyethylene composition further comprises from 1 to 15wt% of component (6), polyethylene D component, based on the total weight of components (1) to (6);
the polyethylene D component contains one or more polyethylene resins Dn having a comonomer selected from one or more of propylene, 1-butene, 1-hexene and 1-octene in an amount of 5 to 95 mol%.
14. The polyethylene composition according to claim 13, wherein the comonomer of the polyethylene resin Dn is selected from one or more of propylene, 1-butene and 1-octene, with a comonomer content of 5-20 mol% or 80-95 mol%.
15. The polyethylene composition according to claim 13, wherein the polyethylene resin Dn has a density of 0.830-0.920g/cm 3 And a melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.5 and 20 g/10 min.
16. The polyethylene composition according to claim 15, wherein the polyethylene resin Dn has a density of 0.840-0.910g/cm 3 A melt index of 0.8 to 10 g/10m measured at 190 ℃ under a load of 2.16kgin。
17. The polyethylene composition according to any of claims 1 to 3, wherein the polyethylene composition further comprises from 0.1 to 30wt% of component (7) polyethylene E component, based on the total weight of components (1) to (7);
wherein the polyethylene E component has an intrinsic viscosity of 2000-.
18. Polyethylene composition according to claim 17, wherein the polyethylene E component is present in an amount of 0.2 to 20wt%, based on the total weight of components (1) to (7).
19. Polyethylene composition according to claim 18, wherein the polyethylene E component is present in an amount of 0.5 to 10wt%, based on the total weight of components (1) to (7).
20. Polyethylene composition according to claim 17 wherein the polyethylene E-fraction has an intrinsic viscosity of 3000-4500 as tested according to ISO 1628-3.
21. The process for producing a polyethylene composition according to any of claims 1 to 20, comprising mixing the components under stirring, melt blending, extruding, cooling and pelletizing to obtain the polyethylene composition.
22. The method of claim 21, wherein the melt blending extrusion temperature is from 150 ℃ to 270 ℃.
23. The method of claim 22, wherein the melt blending extrusion temperature is 170 ℃ to 240 ℃.
24. A packaging article made from the polyethylene composition of any one of claims 1-20.
25. The packaging article of claim 24, wherein the packaging article is a film article.
26. The packaging article of claim 24, wherein the packaging article is at least one of a blister article, a blow molded article, and an extrusion molded article.
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