CN114015143B - PE blown film for liquid packaging and preparation method thereof - Google Patents

PE blown film for liquid packaging and preparation method thereof Download PDF

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Publication number
CN114015143B
CN114015143B CN202111485424.8A CN202111485424A CN114015143B CN 114015143 B CN114015143 B CN 114015143B CN 202111485424 A CN202111485424 A CN 202111485424A CN 114015143 B CN114015143 B CN 114015143B
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film
density polyethylene
parts
polyethylene
blown film
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CN114015143A (en
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姜鹏
卞慎坤
黄志勇
王树宪
张凯
翟江东
张辉
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Qingdao Hengxin Plastic Co ltd
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Qingdao Hengxin Plastic Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/521—Esters of phosphoric acids, e.g. of H3PO4

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  • Polymers & Plastics (AREA)
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Abstract

The invention discloses a PE blown film for liquid packaging, which is mainly prepared from the following raw materials in parts by weight: 50-80 parts of metallocene polyethylene, 10-25 parts of linear low-density polyethylene and 10-25 parts of low-density polyethylene; the density of the metallocene polyethylene is 0.900-0.918 g/cm 3 The density of the linear low density polyethylene is 0.915-0.921 g/cm 3 The density of the low-density polyethylene is 0.920-0.925 g/cm 3 . According to the PE blown film for liquid packaging, disclosed by the invention, metallocene polyethylene, linear low-density polyethylene and low-density polyethylene are mixed in proportion, so that the advantages of the metallocene polyethylene, the linear low-density polyethylene and the low-density polyethylene can be combined, the rigidity and the toughness of the PE blown film are provided, the stress strength and the kneading performance of the PE blown film can be ensured even in a long-distance liquid transportation process, meanwhile, the PE blown film is provided with good tensile strength, right-angle tear strength, dart drop impact strength, heat seal strength and kneading performance in a multilayer coextrusion blowing processing mode, and the comprehensive performance of the film is improved.

Description

PE blown film for liquid packaging and preparation method thereof
Technical Field
The invention relates to the technical field of film materials, in particular to a PE blown film for liquid packaging and a preparation method thereof.
Background
With the rapid development of world trade, the demand for transportation of liquids is also increasing, and the competition is also increasing. In the past liquid transportation, a plastic barrel, an iron barrel and a film and paper box packaging mode are generally used for transporting liquid, the mode has the characteristics of insufficient cargo loading amount, high packaging cost and high transportation cost, in order to reduce the transportation cost, a PE film is mostly used as a packaging material in the middle and large liquid transportation process, and the PE film is widely applied in the packaging field and can be applied to food and food additive packaging, non-dangerous liquid chemical packaging, industrial alcohol, acid ester packaging, petroleum extract packaging and the like.
The PE film has the characteristics of moisture resistance, small moisture permeability and the like, and has the characteristics of good chemical stability, good ductility and the like, so that the PE film can be used as a medium-and-small-sized liquid transportation packaging material, but if the PE film is used as a medium-and-large-sized packaging material, the PE film can shake very severely along with the starting and braking of a vehicle in the package due to the liquid, and meanwhile, the conventional PE film is easy to tear during large-sized packaging due to the problems of weak right-angle tearing strength, poor rubbing property and low dart drop impact property of the PE film due to the weight of the liquid.
Therefore, the prior art needs to be solved.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a PE blown film for liquid packaging and a preparation method thereof. The invention provides a PE blown film for liquid packaging, which has the advantages of less processing, good sealing performance, strong dart impact performance, high right-angle tearing strength and good kneading performance.
The technical scheme of the invention is realized as follows:
the PE blown film for liquid packaging is mainly prepared from the following raw materials in parts by weight: 50-80 parts of metallocene polyethylene, 10-25 parts of linear low-density polyethylene and 10-25 parts of low-density polyethylene; the density of the metallocene polyethylene is 0.900-0.918 g/cm 3 The density of the linear low density polyethylene is 0.915-0.921 g/cm 3 The density of the low-density polyethylene is 0.920-0.925 g/cm 3 。
By adopting the technical scheme, the metallocene polyethylene has higher stretching resistance, tearing resistance, dart impact resistance and kneading performance and good sealing performance, and when the material is used as a film, the physical performance is good, but the processing performance is general, the stability of a film bubble is difficult to control in the blowing process, and the equipment load is large. The linear low-density polyethylene has good stretch resistance and tear resistance, has small density difference with the low-density polyethylene, does not have layering phenomenon in the melting process, has common dart impact property and kneading property, has common processing property, has difficult control of bubble stability in the blowing process and has large equipment load. The low-density polyethylene has good openness, high transparency and easy processing, and can improve the integral bubble stability of the mixture when being mixed with metallocene polyethylene and linear low-density polyethylene for preparation. According to the invention, the metallocene polyethylene, the linear low-density polyethylene and the low-density polyethylene are mixed according to the proportion in the scheme, so that the excellent tensile property, tear resistance, dart drop impact property and kneading property of the metallocene polyethylene and the linear low-density polyethylene can be exerted, meanwhile, the metallocene polyethylene and the linear low-density polyethylene are combined with the low-density polyethylene, the layering phenomenon can not occur in the melting process, the good processing property can be ensured, and finally, the evenly mixed melt can be obtained, so that the PE blown film for liquid packaging is even in material quality.
The PE blown film for liquid packaging is mainly prepared from the following raw materials in parts by weight: 60-80 parts of metallocene polyethylene, 10-20 parts of linear low-density polyethylene and 10-20 parts of low-density polyethylene. More preferably, 80 parts of metallocene polyethylene, 10 parts of linear low density polyethylene and 10 parts of low density polyethylene. The proposal further preferably selects the proportion of metallocene polyethylene, linear low density polyethylene and low density polyethylene, which is beneficial to obtaining PE blown film for liquid packaging with more excellent performance.
The PE blown film for liquid packaging as described above, wherein the melt index of the metallocene polyethylene is 0.5 to 1.5g/10min, the melt index of the linear low-density polyethylene is 0.5 to 2g/10min, and the melt index of the low-density polyethylene is 0.2 to 0.5g/10min. In the blowing process under the condition, when the low-density polyethylene is mixed with the metallocene polyethylene and the linear low-density polyethylene for preparation, the bubble stability of the whole mixture can be improved.
The PE blown film for liquid packaging as described above has a tensile strength of 35MPa or more and the linear low-density polyethylene has a tensile strength of 22MPa or more. Under the condition, the PE blown film for the liquid packaging has the tensile strength of more than or equal to 35MPa, and is not easy to cause the phenomenon of film thinning in the process of loading liquid for transportation.
The PE blown film for liquid packaging as described above, wherein the metallocene polyethylene has a right angle tear strength of 100KN/m or more, the linear low density polyethylene has a right angle tear strength of 80KN/m or more, and the low density polyethylene has a right angle tear strength of 20KN/m or more. Under such conditions, to ensure that the PE blown film for liquid packaging blown according to the present invention has a right-angle tear strength of 90KN/m or more, it is ensured that the PE film can withstand a greater tearing force without being directly broken.
The PE blown film for liquid packaging as described above, wherein the dart impact strength of the metallocene polyethylene is 1000g or more. Under the condition, the PE blown film for the liquid packaging disclosed by the invention has the dart impact strength of 850g or more, and can bear larger lifting force and sudden braking and sudden stopping impact force when the PE film is used for transporting liquid.
The PE blown film for liquid packaging further comprises 0.5-1 part of a food-grade opening agent, wherein the opening agent is one or two of fatty acid amide and silicon dioxide. Under the condition, the opening agent can obviously reduce the friction coefficient of the resin, improve the workability of the resin and the opening property of the film, and can prevent the plastic film from adhering by adding the opening agent into the PE blown film for liquid packaging.
The PE blown film for liquid packaging further comprises 0.5-1 part of food-grade antistatic master batch, wherein the antistatic master batch has one or two of polar groups and nonpolar groups. Under such conditions, the antistatic master batch can significantly reduce the surface resistance of the object, and the polyethylene is an insulator under the conventional condition, and the surface resistance is 10 12 Omega or more, PE blown film for liquid packaging requires a surface resistance of 10 in order to reduce adsorption of static electricity to dust in air 7 ～10 11 Omega. The PE blown film for liquid packaging is added with the antistatic master batch, has rapid and excellent antistatic effect, can avoid the release of static electricity generated by the insulation performance of polyethylene, and reduces the adsorption of dust in the air by the film.
The PE blown film for liquid packaging further comprises 0.01-1 part of food-grade slipping agent, wherein the slipping agent is fatty acid amide. Under this condition, the slipping agent changes the balance between film slipping and blocking resistance by significantly reducing the coefficient of friction of the plastic film. The slip agent can improve the surface properties of the PE blown film for liquid packaging of the invention, and reduce the friction between films and other surfaces in contact. The PE blown film for liquid packaging is added with a slipping agent, so that the static friction coefficient of the PE film is less than or equal to 0.32, and the dynamic friction coefficient of the PE film is less than or equal to 0.3.
Based on the same inventive concept, the invention also provides a preparation method of PE blown film for liquid packaging, which is characterized by comprising the following steps:
s1, respectively placing metallocene polyethylene, linear low-density polyethylene, a food-grade opening agent, a food-grade antistatic master batch and a food-grade slipping agent into an inner layer stirrer and an outer layer stirrer of 3-5 layers of co-extrusion film blowing equipment, mixing and stirring for 15-45 minutes, and obtaining uniformly mixed particles;
s2, respectively placing metallocene polyethylene, linear low-density polyethylene and low-density polyethylene into a secondary inner layer, a secondary outer layer and a middle layer stirrer of 3-5 layers of coextrusion film blowing equipment, mixing and stirring for 15-45 minutes, and then obtaining uniformly mixed particles;
s3, heating and melting the mixed particle screw obtained in the step A and the step B, pressurizing and heating to obtain a molten mass, and blowing a film of the molten mass to obtain a film;
and S4, cooling the film to obtain the PE blow-molded film for liquid packaging.
According to the preparation method of the PE blown film for liquid packaging, the technical scheme is adopted, the low-density polyethylene with a certain proportion is added into the metallocene polyethylene and the linear low-density polyethylene, so that the processability of the blown film is improved, and meanwhile, the processability, the openness, the antistatic property and the friction coefficient of the PE film are improved by adding the opening agent, the antistatic master batch and the slipping agent into raw materials.
Preferably, in the step S3, the heating temperature of the screw is 160 to 230 ℃. Under these conditions, the raw materials can be sufficiently melt-mixed. More preferably, the temperature of the screw heating is 175-180 ℃.
Preferably, in the step S3, the pressure is increased to 0.2-2 MPa, and the heating temperature is 170-240 ℃. Under the condition, the PE plastic is pressurized, heated and blown before film blowing to obtain the PE blown film for liquid packaging. More preferably, in the step S3, the pressurizing is performed to 1.1-1.2 MPa, and the heating temperature is 185-190 ℃.
Preferably, in the step S4, the cooling air volume is 1000-4000 m 3 And/h. Under the condition, the polyethylene film is cooled by air blowing after film blowing, and the film is conveniently pulled and packaged after cooling. More preferably, in the step S4, the cooling air volume is 1800 to 2000m 3 /h。
The beneficial effects of the invention are as follows:
1. according to the invention, metallocene polyethylene, linear low-density polyethylene and low-density polyethylene are mixed in proportion to form the blown film, so that the advantages of the metallocene polyethylene, the linear low-density polyethylene and the low-density polyethylene can be integrated, and the tensile strength, dart impact strength, right-angle tear strength, heat seal strength and kneading performance of the blown film are improved.
2. The PE blow-molded film for liquid packaging is added with the opening agent and the slipping agent, so that the friction coefficient of the film can be reduced, and the opening property of the film can be improved.
3. The PE blown film for liquid packaging is added with the antistatic master batch, has rapid and excellent antistatic effect, can prevent static electricity generated by the insulation performance of polyethylene from being released, and reduces the adsorption of dust in the air by the film.
4. The preparation method of the PE blown film for liquid packaging has the advantages of simple process, easy operation and strong practicability.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
The experimental methods used in the following examples are conventional methods unless otherwise specified.
Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.
In the following examples, the metallocene polyethylene used was a plastic material of the type MPE-8656 having a density of 0.916g/cm 3 The melt index is 0.5g/10min, the transverse tensile strength is 50MPa, the longitudinal tensile strength is 70MPa, the right-angle tear strength is 115KN/m, and the dart impact strength is 1500g; MPE-5400G plastic material with density of 0.916G/cm 3 The melt index is 1g/10min, the tensile strength is 36.3MPa, the transverse tensile strength is 36.3MPa, the longitudinal tensile strength is 38.5MPa, the right-angle tear strength is 110KN/m, and the dart drop impact strength is 1000g; the linear low density polyethylene adopts a plastic raw material with the size of LLDPE-LL0209AA, and the density is 0.920g/cm 3 The melt index is 0.9g/10min, the transverse tensile strength is 28MPa, the longitudinal tensile strength is 35MPa, and the right-angle tear strength is 90N/m; the low-density polyethylene adopts plastic raw material with the model of LDPE-2100TN00 and the density of 0.920g/cm 3 Melt index of 0.3g/10min, transverse stretchingThe strength is 26MPa, the longitudinal tensile strength is 29MPa, and the right-angle tear strength is 20KN/m.
Example 1
The PE blown film for liquid packaging of the embodiment is prepared from the following raw materials in parts by weight: 70kg of metallocene polyethylene MPE-5400G, 20kg of linear low density polyethylene LLDPE-LL0209AA, 10kg of low density polyethylene LDPE-2100TN00, 0.5kg of erucamide and 0.6kg of phosphate.
The preparation method of the PE blown film for liquid packaging in the embodiment comprises the following steps:
s1, respectively placing 25kg of metallocene polyethylene, 5kg of linear low-density polyethylene, 0.25kg of erucamide and 0.3kg of phosphate into an inner-outer layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and obtaining uniformly mixed particles;
s2, respectively placing 20kg of metallocene polyethylene, 10kg of linear low-density polyethylene and 10kg of low-density polyethylene into a middle layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S1 and S2 through three screws, pressurizing to 1.2MPa after the melting temperature is 180 ℃, heating to 190 ℃, obtaining a melt, and blowing the melt to obtain a film.
S4, carrying out 1800m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Example 2
The PE blown film for liquid packaging of the embodiment is prepared from the following raw materials in parts by weight: 50kg of metallocene polyethylene MPE-5400G, 25kg of linear low density polyethylene LLDPE-LL0209AA, 25kg of low density polyethylene LDPE-2100TN00, 0.6kg of erucamide and 0.6kg of phosphate.
The preparation method of the PE blown film for liquid packaging provided by the embodiment comprises the following steps:
s1, respectively placing 25kg of metallocene polyethylene, 5kg of linear low-density polyethylene, 0.3kg of erucamide and 0.3kg of phosphate into an inner-outer layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s2, respectively placing 15kg of linear low-density polyethylene and 25kg of low-density polyethylene into a middle layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S1 and S2 through three screws, pressurizing to 1.1MPa after the melting temperature is 175 ℃, heating to 185 ℃, obtaining a melt, and blowing the melt to obtain a film.
S4, carrying out 1800m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Example 3
The PE blown film for liquid packaging of the embodiment is prepared from the following raw materials in parts by weight: 80kg of metallocene polyethylene MPE-8656, 10kg of linear low density polyethylene LLDPE-LL0209AA, 10kg of low density polyethylene LDPE-2100TN00, 0.3kg of erucamide and 0.4kg of phosphate.
The preparation method of the PE blown film for liquid packaging provided by the embodiment comprises the following steps:
s1, specifically comprising the following steps:
s11, respectively placing 20kg of metallocene polyethylene, 0.15kg of erucamide and 0.2kg of phosphate into an inner layer stirrer and an outer layer stirrer of 5-layer coextrusion film blowing equipment, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s12, respectively placing 20kg of metallocene polyethylene into a secondary inner layer stirrer and a secondary outer layer stirrer of 5-layer coextrusion film blowing equipment, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s2, respectively placing 10kg of linear low-density polyethylene and 10kg of low-density polyethylene into a middle layer stirrer of 5 layers of coextrusion film blowing equipment, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S11, S12 and S2 through five screws, pressurizing to 1.2MPa after the melting temperature is 180 ℃, heating to 190 ℃ to obtain a melt, and blowing a film of the melt to obtain the film.
S4, carrying out 2000m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Example 4
The PE blown film for liquid packaging of the embodiment is prepared from the following raw materials in parts by weight: 10kg of metallocene polyethylene MPE-8656, 50kg of MPE-5400G, 20kg of linear low density polyethylene LLDPE-LL0209AA, 20kg of low density polyethylene LDPE-2100TN00, 0.5kg of erucamide and 0.6kg of phosphate.
The preparation method of the PE blown film for liquid packaging in the embodiment comprises the following steps:
s1, respectively placing 30kg of metallocene polyethylene, 0.25kg of erucamide and 0.3kg of phosphate into an inner-outer layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s2, respectively placing 20kg of linear low-density polyethylene and 20kg of low-density polyethylene into a middle layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S1 and S2 through three screws, pressurizing to 1.2MPa after the melting temperature is 180 ℃, heating to 190 ℃, obtaining a melt, and blowing the melt to obtain a film.
S4, carrying out 1800m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Example 5
The PE blown film for liquid packaging of the embodiment is prepared from the following raw materials in parts by weight: 15kg of metallocene polyethylene MPE-8656, 55kg of MPE-5400G, 20kg of linear low density polyethylene LLDPE-LL0209AA, 10kg of low density polyethylene LDPE-2100TN00, 0.5kg of erucamide and 0.6kg of phosphate.
The preparation method of the PE blown film for liquid packaging in the embodiment comprises the following steps:
s1, respectively placing 25kg of metallocene polyethylene, 5kg of linear low-density polyethylene, 0.25kg of erucamide and 0.3kg of phosphate into an inner-outer layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and obtaining uniformly mixed particles;
s2, respectively placing 20kg of metallocene polyethylene, 10kg of linear low-density polyethylene and 10kg of low-density polyethylene into a middle layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S1 and S2 through three screws, pressurizing to 1.2MPa after the melting temperature is 180 ℃, heating to 190 ℃, obtaining a melt, and blowing the melt to obtain a film.
S4, carrying out 1800m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Comparative example 1
The PE blown film for liquid packaging of the comparative example is prepared from the following raw materials in parts by weight: 40kg of metallocene polyethylene MPE-5400G, 50kg of linear low density polyethylene LLDPE-LL0209AA, 10kg of low density polyethylene LDPE-2100TN00, 0.3kg of erucamide and 0.4kg of phosphate.
The preparation method of the PE blown film for liquid packaging provided by the comparative example comprises the following steps:
s1, respectively placing 5kg of metallocene polyethylene, 25kg of linear low-density polyethylene, 0.15kg of erucamide and 0.2kg of phosphate into an inner-outer layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and obtaining uniformly mixed particles;
s2, respectively placing 30kg of metallocene polyethylene and 10kg of low-density polyethylene into a middle layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S1 and S2 through three screws, pressurizing to 1.1MPa after the melting temperature is 175 ℃, heating to 185 ℃, obtaining a melt, and blowing the melt to obtain a film.
S4, carrying out 1800m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Comparative example 2
The PE blown film for liquid packaging of the comparative example is prepared from the following raw materials in parts by weight: 70kg of linear low density polyethylene LLDPE-LL0209AA, 30kg of low density polyethylene LDPE-2100TN00, 0.3kg of erucamide and 0.4kg of phosphate.
The preparation method of the PE blown film for liquid packaging provided by the comparative example comprises the following steps:
s1, respectively placing 30kg of linear low-density polyethylene, 0.15kg of erucamide and 0.2kg of phosphate into an inner-outer layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s2, respectively placing 10kg of linear low-density polyethylene and 30kg of low-density polyethylene into a middle layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S1 and S2 through three screws, pressurizing to 1.1MPa after the melting temperature is 175 ℃, heating to 185 ℃, obtaining a melt, and blowing the melt to obtain a film.
S4, carrying out 1800m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Comparative example 3
The PE blown film for liquid packaging of the comparative example is prepared from the following raw materials in parts by weight: 20kg of metallocene polyethylene MPE-5400G, 40kg of linear low density polyethylene LLDPE-LL0209AA, 40kg of low density polyethylene LDPE-2100TN00, 0.3kg of erucamide and 0.4kg of phosphate.
The preparation method of the PE blown film for liquid packaging provided by the comparative example comprises the following steps:
s1, respectively placing 10kg of metallocene polyethylene, 15kg of linear low-density polyethylene, 5kg of low-density polyethylene, 0.15kg of erucamide and 0.2kg of phosphate into an inner-outer layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s2, respectively placing 10kg of linear low-density polyethylene and 30kg of low-density polyethylene into a middle layer stirrer of a 3-layer coextrusion film blowing device, mixing and stirring for 30 minutes, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S1 and S2 through three screws, pressurizing to 1.1MPa after the melting temperature is 175 ℃, heating to 185 ℃, obtaining a melt, and blowing the melt to obtain a film.
S4, carrying out 1800m on the film 3 And (3) carrying out air cooling treatment to obtain the PE blown film for liquid packaging.
Performance contrast test
The PE blown films for liquid packaging obtained in the five examples and the three comparative examples were subjected to tensile strength property test according to GB/T1040.3-2006, right-angle tear strength property test according to QB/T1130-1991, dart drop impact strength property test according to GBT9639.1-2008, heat seal strength test according to QB/T2358-1998, kneading property test according to ASTF 392, and the test results are shown in Table 1.
TABLE 1 Performance parameters of PE blown films of examples 1-5 and comparative examples 1-3
As can be seen from Table 1, the PE blown film for liquid packaging of the present invention has excellent tensile strength, right angle tear strength, dart impact strength, heat seal strength and kneading property, and improves the overall properties of the film, as compared with comparative example 1, comparative example 2 and comparative example 3.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (3)

1. The PE blown film for liquid packaging is characterized by being mainly prepared from the following raw materials in parts by weight: 80 parts of metallocene polyethylene MPE-8656, 10 parts of linear low density polyethylene LLDPE-LL0209AA, and 10 parts of low density polyethylene LDPE-2100TN00.
2. The PE blown film for liquid packaging of claim 1 further comprising erucamide, phosphate ester.
3. A process for the preparation of a PE blown film for liquid packaging according to claim 2, characterized by comprising the steps of:
s11, respectively placing 20 parts of metallocene polyethylene, erucamide and phosphate into an inner layer stirrer and an outer layer stirrer of 5 layers of coextrusion film blowing equipment, mixing and stirring, and then obtaining uniformly mixed particles;
s12, respectively placing 20 parts of metallocene polyethylene into a secondary inner layer stirrer and a secondary outer layer stirrer of 5-layer coextrusion film blowing equipment, mixing and stirring, and then obtaining uniformly mixed particles;
s2, respectively placing 10 parts of linear low-density polyethylene and 10 parts of low-density polyethylene into a middle layer stirrer of 5 layers of coextrusion film blowing equipment, mixing and stirring, and then obtaining uniformly mixed particles;
s3, respectively heating and melting the mixed particles obtained in the steps S11, S12 and S2 through five screws, pressurizing and heating to obtain a melt, and blowing a film of the melt to obtain a film;
s4, carrying out air cooling treatment on the film to obtain the PE blow-molded film for liquid packaging.
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