CN111100365B - Polyethylene composition, preparation method thereof and extrusion molding packaging product - Google Patents
Polyethylene composition, preparation method thereof and extrusion molding packaging product Download PDFInfo
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- CN111100365B CN111100365B CN201811260427.XA CN201811260427A CN111100365B CN 111100365 B CN111100365 B CN 111100365B CN 201811260427 A CN201811260427 A CN 201811260427A CN 111100365 B CN111100365 B CN 111100365B
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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
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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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four 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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
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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
- C08L2207/068—Ultra high molecular weight polyethylene
Abstract
The invention belongs to the field of polyolefin, and relates to a polyethylene composition, a preparation method thereof and an extrusion molding packaging product. The polyethylene composition comprises the following components: (1)10-60 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 extrusion molding package of the invention has obviously higher barrier property to volatile organic small molecules, and does not lose processing performance.
Description
Technical Field
The present invention belongs to the field of polyolefin, and more particularly, to a polyethylene composition, a method for preparing the same, and an extrusion-molded packaging article made of the same.
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, and is widely applied in the field of extrusion molding and packaging. Extrusion packaging is a packaging method which is important in the field of packaging. In the packaging of goods such as food, pharmaceuticals and cosmetics, polyethylene-based packaging often 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 rule of the blocking of non-solid small molecules such as conventional oxygen, water, carbon dioxide and the like at normal temperature, and the rule of the traditional high-blocking material cannot be directly applied.
To address this problem, there are two main solutions currently on the market, 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 a high barrier material (such as ethylene-vinyl alcohol copolymer EVOH), such as patent document 201580053015.7. 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 invention aims to overcome the defects of the polyethylene extrusion molding package, and provides a polyethylene composition, a preparation method thereof and an extrusion molding package product. Compared with the traditional low-density polyethylene extrusion molding package, the extrusion molding package has the advantage that the barrier property 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 60 weight percent of 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%; the density of the polyethylene resin An is 0.950-0.970g/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 4.0 and 15;
(2)10 to 60wt% of a polyethylene B component, based on the total weight of component (1) to component (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/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 2.0 and 7.0;
(3)10 to 70wt% of a polyethylene C component, based on the total weight of component (1) to component (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 the polyethylene resin Cn does not contain comonomer; the density of the polyethylene resin Cn is 0.890-0.930g/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.5 and 4.0;
(4)0.01 to 3% by weight, based on the total weight of component (1) to component (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 15 to 35wt% 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 2 mol%, preferably from 0.5 to 1.5 mol%.
Further preferably, the content of the polyethylene B component is 12 to 30wt% 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% based on the total weight of the components (1) to (4).
Further preferably, the content of the organic volatile molecules V is 0.1 to 2wt% based on the total weight of the components (1) to (4).
According to the invention, preferably, the polyethylene resin An has a density of 0.952 to 0.965g/cm3A 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/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 3.0 and 5.0; the density of the polyethylene resin Cn is 0.910-0.925g/cm3And a melt index of 0.7 to 3.0 measured at 190 ℃ under a load of 2.16 kg.
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 odour 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 1.5% by weight, 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 the nucleating agent used in the present invention may be various antioxidants and nucleating agents which are conventionally used 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 in Zhongda chemical industry.
According to a preferred embodiment of the present invention, the polyethylene composition further comprises component (6), polyethylene D component, in an amount of 3 to 30wt%, based on the total weight of components (1) to (6); preferably, the polyethylene D component is present in an amount of 5 to 20wt%, 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-described 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/cm3A 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/cm3And 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 invention, the polyethylene composition further comprises component (7), polyethylene E component, in an amount of 0.1 to 10% by weight, 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 5.0wt%, based on the total weight of component (1) to component (7);
wherein the intrinsic viscosity of the polyethylene E component is 2000-; 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 mixing the above-mentioned components under stirring, 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 an extrusion molded packaging article made from the above polyethylene composition. The method of making the packaging article may employ various processes conventional in the art.
The packaging article of the present invention is particularly suitable for use in 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 the embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating the present 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 numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.
In the following examples and comparative examples, the melt index of the polyethylene was measured on a model LMI melt index apparatus from Dynisco, at a test temperature of 190 ℃ and a load of 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 standard;
the composition of the polyethylene composition is determined by the feed 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: 43g of HDPE-1252 (Nexus Resin, U.S.A., melt index of 11, density of 0.952g/mL, polymerization pressure of 3MPa, polymerization temperature of 70 ℃, comonomer of 1-butene, comonomer content of 0.8 mol%), 40g of DNDB 7149 (Zhongpetrochemical Tianjin petrochemical, melt index of 4, density of 0.934g/mL, polymerization pressure of 4MPa, polymerization temperature of 85 ℃, comonomer of 1-butene, comonomer content of 2.5 mol%), 110g of LD100BW (Zhongpetrochemical Yanshan petrochemical, melt index of 2.1, density of 0.923g/mL, polymerization pressure of 200MPa, polymerization temperature of 2400 ℃), 25g of Versify (Dow chemical, melt index of 2, density of 0.859g/mL, comonomer of propylene, comonomer content of 87 mol%), 6g of GUR 4150(Ticona, UHMWPE, intrinsic viscosity of 3850), 1.8g of 1, 8-terpadiene (Shanghai Jiuzui industry Co., Ltd.), 0.5g of antioxidant 168 (Nanjing Hualimen), 0.5g of antioxidant 1010 (Nanjing Hualimen), and 1.0g of nucleating agent NP-508 (Zhongda chemical industry) were mixed thoroughly. The resulting mixture was pelletized by extrusion through a twin-screw extruder at a rotation speed of 10rpm and a torque of 20N × m, and the temperatures of the respective zones from the feed port to the extrusion port in the twin-screw extruder were 180 ℃, 200 ℃, 220 ℃ in this order to obtain polyester 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: 30g of DGDA 2460BK (Dow chemical, U.S.A., melt index of 7, density of 0.959g/mL, polymerization pressure of 3MPa, polymerization temperature of 80 ℃, comonomer of 1-hexene, comonomer content of 1 mol%), 50g of SP3010 (Mitsui, Japan, 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%), 100g of 2426F (Shenhua Xinjiang, melt index of 0.75, density of 0.92g/mL, polymerization pressure of 290MPa, polymerization temperature of 310 ℃ C.) of 15g of Engage 8452 (Dow chemical, melt index of 3, density of 0.875g/mL, comonomer of 1-octene, comonomer content of 15 mol%), 10g of DB530 5305A (Taguchi chemical, U.S.S., intrinsic viscosity of 3300), 1.7g of 1, 8-terpadiene (Shanghai Jiuzui industry Co., Ltd.), 0.5g of antioxidant 168 (Nanjing Hualimen), 0.5g of antioxidant 1010 (Nanjing Hualimen), and 1.0g of nucleating agent NP-508 (Zhongda chemical industry) were mixed thoroughly. The resulting mixture was pelletized by extrusion through a twin-screw extruder at a rotation speed of 10rpm and a torque of 20N × m, and the temperatures of the respective zones from the feed port to the extrusion port in the twin-screw extruder were 180 ℃, 200 ℃, 220 ℃ in this order to obtain polyester 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: 60g of DGDA 2460BK (Dow chemical, USA, melt index of 7, density of 0.959g/mL, polymerization pressure of 3MPa, polymerization temperature of 80 ℃, comonomer of 1-hexene, comonomer content of 1 mol%), 30g of SP3010 (Tritsui, 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%), 80g of 2426F (Shenhua Xinjiang, melt index of 0.75, density of 0.92g/mL, polymerization pressure of 290MPa, polymerization temperature of 310 ℃), 12g of Engage 8452 (Dow chemical, melt index of 3, density of 0.875g/mL, comonomer of 1-octene, comonomer content of 15 mol%), 5g of DB530 5305A (Tai-plastics USA, intrinsic viscosity of 3300), 1.2g of 1, 8-terpene diene (Shanghai Jiuzui industry Co., Ltd.), 0.5g of antioxidant 168 (Nanjing Hualiming), 0.5g of antioxidant 1010 (Nanjing Hualiming), and 1.0g of nucleating agent NP-508 (Zhongda chemical industry) were mixed thoroughly. The mixture obtained through a double screw extruder extrusion granulation, screw speed control for 10rpm, torque 20N x m, the double screw extruder from the feed inlet to the extrusion outlet of the section of the temperature is sequentially 180 degrees, 200 degrees, 220 degrees, preparation of polyester 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 1, except that the GUR 4150 component was not added. Polyethylene composition a5 was obtained.
Example 6
The same as in example 1, except that the HDPE-1252 component was added in an amount of 25 g. Polyethylene composition a6 was obtained.
Comparative example 1
A conventional low-density polyethylene LD104 for extrusion molding (medium petrochemical Yanshan petrochemical, melt index of 1.95, density of 0.923g/mL) was used as comparative material D1.
Comparative example 2
High density polyethylene HDPE-1252 (Nexus Resin, U.S. with a melt index of 11 and a density of 0.952g/mL) was used as comparative material D2.
Comparative example 3
Linear low density polyethylene DNDB 7149 (medium petrochemical Tianjin petrochemical, melt index 4, density 0.934g/mL) was used as comparative material D3.
Test example
The materials of the examples and comparative examples were prepared into extrusion-molded packages having a thickness of about 1mm and a volume of about 50mL, 0.1g of menthol (typical volatile drug) was put in, and then the openings were melt-sealed. The package was placed in a forced air oven at 60 ℃ and tested for its weight loss effect after 120 hours. The average of 5 trials was taken. And observing the uniformity of the welding position at the bottom of the package. The results are shown in Table 1.
TABLE 1
| Numbering | Weight loss after 120 h/mg | Uniformity of package bottom weld |
| A1 | 3.01 | Uniformity |
| A2 | 3.22 | Uniformity |
| A3 | 3.51 | Uniformity |
| A4 | 5.25 | Uniformity |
| A5 | 6.18 | Uniformity |
| A6 | 6.53 | Uniformity |
| D1 | 39.6 | Uniformity |
| D2 | 30.1 | Unevenness of |
| D3 | 41.2 | Uniformity |
From the above examples and comparative example data, it can be seen that the polyethylene extrusion packages of the present invention have significantly higher barrier properties to volatile organic small molecules without loss of processability.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. 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 (20)
1. A polyethylene composition, characterized in that the polyethylene composition comprises the following components:
(1)10 to 60 weight percent of 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%; the density of the polyethylene resin An is 0.950-0.970g/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 4.0 and 15;
(2)10 to 60wt% of a polyethylene B component, based on the total weight of component (1) to component (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 to 0.940g/cm3At 19A melt index, measured at 0 ℃, under a load of 2.16kg, of between 2.0 and 7.0;
(3)10 to 70wt% of a polyethylene C component, based on the total weight of component (1) to component (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 the polyethylene resin Cn does not contain comonomer; the density of the polyethylene resin Cn is 0.890-0.930g/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.5 and 4.0;
(4)0.01 to 3% by weight, based on the total weight of component (1) to component (4), of organic volatile molecules V; wherein the molecular weight of the organic volatile molecule V is 80-2000;
the polyethylene composition further contains 0 to 2wt% of component (5) additive X, based on the total weight of component (1) to component (5);
the polyethylene composition further contains component (6) polyethylene D component and/or component (7) polyethylene E component;
wherein the content of the component (6), namely the polyethylene D component, is 3 to 30 weight percent based on the total weight of the components (1) to (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%; the density of the polyethylene resin Dn is 0.830-0.920g/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.5 and 20;
the content of the polyethylene E component of the component (7) is 0.1 to 10 weight percent based on the total weight of the components (1) to (7); the intrinsic viscosity of the polyethylene E component is 2000-5000 as tested according to ISO 1628-3;
the sum of the percentages of the components in the polyethylene composition is equal to 100%.
2. Polyethylene composition according to claim 1, wherein the polyethylene a fraction is from 15 to 35wt%, the polyethylene B fraction is from 12 to 30wt%, the polyethylene C fraction is from 35 to 60wt% and the organic volatile molecules V are from 0.1 to 2wt%, based on the total weight of fractions (1) to (4).
3. The polyethylene composition according to claim 1, wherein the polyethylene resin An has a density of from 0.952 to 0.965g/cm3A 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/cm3A melt index, measured at 190 ℃ under a load of 2.16kg, of between 3.0 and 5.0; the density of the polyethylene resin Cn is 0.910-0.925g/cm3And a melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.7 and 3.0.
4. Polyethylene composition according to any of claims 1-3 wherein the organic volatile molecule V has a molecular weight of 90-1000, is slightly water soluble or water insoluble and has a boiling point of 120-.
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 5, 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. The polyethylene composition according to any of claims 1-3, wherein the organic volatile molecule V is an organic volatile component derived from food, pharmaceutical or cosmetic products or derivatives thereof.
8. The polyethylene composition according to claim 1, 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).
9. The polyethylene composition according to claim 1, wherein the additive X is an antioxidant and/or a nucleating agent.
10. The polyethylene composition according to claim 9, wherein the antioxidant is one or more of hindered phenolic antioxidants, phosphite antioxidants and pentaerythritol antioxidants.
11. The polyethylene composition according to claim 9, wherein the nucleating agent is an organic salt-based nucleating agent and/or an inorganic salt-based nucleating agent.
12. Polyethylene composition according to claim 1, wherein the polyethylene D component is present in an amount of 5 to 20wt%, based on the total weight of components (1) to (6).
13. Polyethylene composition according to claim 1 wherein the comonomer of the polyethylene resin Dn is selected from one or more of propylene, 1-butene and 1-octene in an amount of 5-20 mol% or 80-95 mol%.
14. Polyethylene composition according to claim 1 wherein the polyethylene resin Dn has a density of 0.840-0.910g/cm3And a melt index, measured at 190 ℃ under a load of 2.16kg, of between 0.8 and 10.
15. Polyethylene composition according to claim 1, wherein the polyethylene E component is present in an amount of 0.2 to 5.0wt%, based on the total weight of components (1) to (7).
16. The polyethylene composition according to claim 1, wherein the polyethylene E-component has an intrinsic viscosity of 3000 and 4500 as tested according to ISO 1628-3.
17. The process for producing a polyethylene composition according to any of claims 1 to 16, wherein the process comprises mixing the components under stirring, melt blending, extruding, cooling and pelletizing to obtain the polyethylene composition.
18. The method of claim 17, wherein the melt blending extrusion temperature is from 150 ℃ to 270 ℃.
19. The method of claim 18, wherein the melt blending extrusion temperature is 170 ℃ to 240 ℃.
20. An extrusion molded packaging article made from the polyethylene composition of any one of claims 1-16.
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