CN117087280A - Polypropylene film and application thereof - Google Patents
Polypropylene film and application thereof Download PDFInfo
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- CN117087280A CN117087280A CN202210520343.5A CN202210520343A CN117087280A CN 117087280 A CN117087280 A CN 117087280A CN 202210520343 A CN202210520343 A CN 202210520343A CN 117087280 A CN117087280 A CN 117087280A
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- -1 Polypropylene Polymers 0.000 title claims abstract description 59
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 59
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 59
- 229920000642 polymer Polymers 0.000 claims abstract description 89
- 239000010410 layer Substances 0.000 claims abstract description 58
- 239000000203 mixture Substances 0.000 claims abstract description 47
- 229920001577 copolymer Polymers 0.000 claims abstract description 40
- 239000012792 core layer Substances 0.000 claims abstract description 23
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 11
- 239000000155 melt Substances 0.000 claims description 21
- 229920005604 random copolymer Polymers 0.000 claims description 20
- 229920001038 ethylene copolymer Polymers 0.000 claims description 17
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 9
- 239000005977 Ethylene Substances 0.000 claims description 9
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 7
- 239000004711 α-olefin Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 5
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 4
- 150000007934 α,β-unsaturated carboxylic acids Chemical class 0.000 claims description 4
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 claims description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 3
- 229920005653 propylene-ethylene copolymer Polymers 0.000 claims description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 2
- 229920005606 polypropylene copolymer Polymers 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims 2
- 238000007789 sealing Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 6
- 230000001954 sterilising effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- VRZACSAFVDXUCE-UHFFFAOYSA-N but-3-enoic acid;prop-2-enoic acid Chemical compound OC(=O)C=C.OC(=O)CC=C VRZACSAFVDXUCE-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention relates to the field of films, in particular to a polypropylene film and application thereof. The polypropylene film is characterized in that: the film is of a multi-layer structure, and the film is a corona layer, a core layer and a heat sealing layer which are sequentially laminated; wherein the corona layer is made from a corona layer composition comprising a heterophasic polymer a; the core layer is made of a core layer composition comprising a heterophasic polymer a and a heterophasic polymer b; the heat-seal layer is made of a heat-seal layer composition comprising a heterophasic polymer a; the heterophasic polymer a and heterophasic polymer b each independently comprise a continuous phase provided by polypropylene and a dispersed phase provided by copolymer rubber. The film prepared by the method has good mechanical property and heat sealing property and simultaneously keeps good transparency.
Description
Technical Field
The invention relates to the field of films, in particular to a polypropylene film and application thereof.
Background
Polypropylene films are widely used in the field of food packaging due to their excellent optical properties, mechanical properties and packaging adaptability. The polypropylene film can be prepared by a unidirectional tape casting film processing technology, and the film is required to have good toughness, optical performance and low odor volatility, and is required not to deform and generate peculiar smell at the sterilization temperature of 131 ℃ no matter the film is prepared or the film is used as a packaging material.
CN102453180a discloses a film prepared using butene and propylene copolymers, which has better transparency and lower soluble content. Because of the use of more butene-propylene copolymer, the film has unsatisfactory properties of solubles content, transparency of package appearance, stiffness, etc., and it is uncertain whether the film can withstand a sterilization environment of 131 ℃.
Disclosure of Invention
The invention aims to solve the problems of poor transparency, low pendulum impact strength, poor high temperature resistance and the like of a film in the prior art. The polypropylene film can be used in a sterilization environment with a sterilization temperature of 131 ℃, and has good transparency and good pendulum impact resistance.
In order to achieve the above object, a first aspect of the present invention provides a polypropylene film, wherein the film has a multilayer structure, and the film has a corona layer, a core layer and a heat sealing layer which are sequentially laminated;
wherein the corona layer is made from a corona layer composition comprising a heterophasic polymer a; the core layer is made of a core layer composition comprising a heterophasic polymer a and a heterophasic polymer b; the heat-seal layer is made of a heat-seal layer composition comprising a heterophasic polymer a;
the heterophasic polymer a and heterophasic polymer b each independently comprise a continuous phase provided by polypropylene and a dispersed phase provided by copolymer rubber;
the content of the dispersed phase provided by the copolymer rubber is 5 to 20wt% based on the total weight of the heterophasic high polymer a;
the content of the dispersed phase provided by the copolymer rubber is 30 to 50wt% based on the total weight of the heterophasic polymer b.
The second aspect of the invention provides an application of the polypropylene film in the packaging field.
Through the technical scheme, the polypropylene film and the application thereof provided by the invention have the following beneficial effects:
the film of the invention adopts the structural design of a corona layer, a core layer and a heat sealing layer, the main components of each layer are selected from at least one of multiphase high polymer a and multiphase high polymer b, and the multiphase high polymer comprises a continuous phase provided by polypropylene and a disperse phase provided by copolymer rubber. The multiphase polymer with the specific structure can not only improve the high temperature resistance and pendulum impact resistance of the film, but also keep the film to have better transparency and simultaneously show better heat sealing performance.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The first aspect of the present invention provides a polypropylene film characterized in that: the film is of a multi-layer structure, and the film is a corona layer, a core layer and a heat sealing layer which are sequentially laminated;
wherein the corona layer is made from a corona layer composition comprising a heterophasic polymer a; the core layer is made of a core layer composition comprising a heterophasic polymer a and a heterophasic polymer b; the heat-seal layer is made of a heat-seal layer composition comprising a heterophasic polymer a;
the heterophasic polymer a and heterophasic polymer b each independently comprise a continuous phase provided by polypropylene and a dispersed phase provided by copolymer rubber;
the content of the dispersed phase provided by the copolymer rubber is 5 to 20wt% based on the total weight of the heterophasic high polymer a;
the content of the dispersed phase provided by the copolymer rubber is 30 to 50wt% based on the total weight of the heterophasic polymer b.
In the invention, the content of the disperse phase provided by the copolymer rubber in the multiphase polymer has great influence on the transparency and the high temperature resistance of the film, and the prepared film has better transparency and better high temperature resistance by adopting the multiphase polymer with the characteristics.
According to the invention, the content of the dispersed phase provided by the copolymer rubber is from 5 to 16% by weight, based on the total weight of the heterophasic polymer a;
and/or the content of the dispersed phase provided by the copolymer rubber is 30 to 40wt% based on the total weight of the heterophasic polymer b.
According to the invention, the copolymer rubber is a copolymer of propylene with ethylene and/or butene.
According to the present invention, the copolymer rubber is a propylene-ethylene copolymer rubber.
According to the invention, the heterophasic polymer a has a melt mass flow rate of 2-8g/10min, measured at 230℃and under a load of 2.16 kg.
According to the invention, the heterophasic polymer b has a melt mass flow rate of 2-8g/10min, measured at 230℃and under a load of 2.16 kg.
In the present invention, the heterophasic polymer is commercially available, for example, heterophasic polymer a-1 under the trade name F8303-GD of Yanshan petrochemical industry; the multi-phase polymer b-1 with the brand of F8801-GD is used for the petrifaction of Yanshan. The heterogeneous high polymer a and the heterogeneous high polymer b can also be prepared according to the following steps:
firstly, introducing a reaction raw material into a first kettle, and homopolymerizing polypropylene in the first kettle to prepare a polypropylene continuous phase; then, adding the prepared polypropylene continuous phase into a second kettle, introducing reaction raw materials such as propylene and ethylene into the second kettle, and mixing the copolymer rubber dispersed phase prepared in the second kettle into the polypropylene continuous phase to prepare the multiphase polymer.
In the present invention, it is also possible to obtain heterophasic polymers by direct mechanical mixing of the continuous phase provided by the polypropylene and the disperse phase provided by the copolymer rubber.
According to the invention, the weight average molecular weight of the copolymer rubber is 400000-600000g/mol.
In the invention, the propylene-ethylene copolymer with the characteristics has the characteristic of high impact strength.
According to the present invention, the corona layer composition further comprises an ethylene copolymer, which is a copolymer of ethylene with a monomer B selected from at least one of α, β -unsaturated carboxylic acid, α, β -unsaturated carboxylic acid ester, and vinyl carboxylate (vinyl acetate).
In the invention, in order to improve the interface effect of the film and the matrix material, such as aluminum foil, and improve the strength of the film-base material composite material, the ethylene copolymer with polar groups is added into the corona layer composition, and the corona layer with the characteristics is adopted, so that the film has better high temperature resistance while improving the composite strength of the film and the matrix material.
According to the invention, the content of structural units provided by the monomers B is from 1 to 10% by weight, based on the total weight of the ethylene copolymer.
According to the invention, the heterophasic polymer a is present in an amount of 90 to 99wt% and the ethylene copolymer is present in an amount of 1 to 10wt%, based on the total weight of the corona layer composition.
Further, the heterophasic polymer a is present in an amount of 92 to 99wt% and the ethylene copolymer is present in an amount of 1 to 8wt%, based on the total weight of the corona layer composition.
Still further, the heterophasic polymer a is present in an amount of 95 to 99wt% and the ethylene copolymer is present in an amount of 1 to 5wt%, based on the total weight of the corona layer composition.
According to the invention, the ethylene copolymer has a melt mass flow rate of 2-8g/10min, measured at 230℃and under a load of 2.16 kg.
In the present invention, the use of the ethylene copolymer having the above-described characteristics can further increase the peel strength.
According to the invention, the heat seal layer composition further comprises a random copolymer polypropylene of propylene and a comonomer.
According to the invention, the comonomer is selected from ethylene and/or alpha-olefins.
According to the invention, the alpha-olefin is C 4 -C 12 Is a alpha-olefin of (c).
Further, the alpha-olefin is selected from at least one of 1-butene, 1-hexene, and 1-octene.
According to the invention, the content of structural units provided by the comonomer is 1 to 8 wt.%, based on the total weight of the random copolymer polypropylene.
According to the invention, the heterophasic polymer a is present in an amount of 80 to 99wt% and the random copolymer polypropylene is present in an amount of 1 to 20wt% based on the total weight of the heat seal composition.
In the invention, the heat sealing layer is added with random copolymer polypropylene, so that the heat sealing temperature of the film can be reduced. The random copolymer polypropylene with the specific composition and content is added into the heat sealing layer composition, so that the defect of poor high temperature resistance of the film caused by the overhigh content of the random copolymer polypropylene can be effectively avoided; but also can effectively avoid the effect that the heat sealing temperature of the film cannot be reduced due to the too low content of the random copolymer polypropylene.
Further, the content of the heterophasic high polymer a is 85 to 99wt% and the content of the random copolymer polypropylene is 1 to 15wt% based on the total weight of the heat sealing layer composition.
Still further, the heterophasic polymer a is present in an amount of 90 to 99wt% and the random copolymer polypropylene is present in an amount of 1 to 10wt% based on the total weight of the heat sealing composition.
According to the invention, the random copolymer polypropylene has a melt mass flow rate of 2-8g/10min, measured at 230℃and under a load of 2.16 kg.
In the invention, the random copolymer polypropylene with the characteristics has the characteristic of good processing performance.
According to the invention, the heterophasic polymer a is present in an amount of 70 to 90wt% and the heterophasic polymer b is present in an amount of 10 to 30wt%, based on the total weight of the core composition.
Further, the content of the heterophasic polymer a is 70 to 85wt% and the content of the heterophasic polymer b is 15 to 30wt% based on the total weight of the core layer composition.
Still further, the heterophasic polymer a is present in an amount of 80 to 85wt% and the heterophasic polymer b is present in an amount of 15 to 20wt%, based on the total weight of the core composition.
In the invention, the core layer with the characteristics has the characteristics of high impact strength and good tearing resistance.
According to the invention, the film has a three-layer structure.
According to the invention, the thickness ratio of the corona layer, the core layer and the heat seal layer is 1:2-4:1.
In the invention, the film with the characteristics has the advantages of high impact strength, high temperature resistance and tear resistance.
In the invention, the preparation method of the polypropylene film comprises the following steps: the mixture of the corona layer, the core layer and the heat sealing layer is respectively melted in three extruders, and the melt is extruded into a three-layer film through a slit (the slit gap is 0.4-0.65 mm) on a T-shaped machine head. The extruded film was applied to a chill roll with compressed air from an air knife. In the process of extruding the film through the cooling roller, the feeding speed and the drawing speed of the extruder are controlled, so that the final thickness of each layer of film is controlled.
The second aspect of the invention provides an application of the polypropylene film in the packaging field.
The present invention will be described in detail by examples. In the following examples, various raw materials used were obtained from commercial sources without particular explanation.
Heterophasic polymer a-1, available from Yanshan petrochemical industry under the trade designation F8303-GD, has a melt mass flow rate of 3.5g/10min, measured at 230℃and under a load of 2.16kg, and a copolymer rubber content of 16% by weight.
Heterophasic polymer b-1, available from Yanshan petrochemical industry under the trade designation F8801-GD, had a melt mass flow rate of 4.6g/10min, measured at 230℃and under a load of 2.16kg, and a copolymer rubber content of 39% by weight.
Heterophasic polymer a-2, available from Yanshan petrochemical industry under the trade designation F8004-GD, has a melt mass flow rate of 4g/10min, measured at 230℃under a load of 2.16kg, and a copolymer rubber content of 20wt%.
Heterophasic polymer b-2, available from Yanshan petrochemical industry under the trade designation F9004-GD, has a melt mass flow rate of 4g/10min, measured at 230℃and under a load of 2.16kg, and a copolymer rubber content of 50% by weight.
Heterophasic polymer a-3, available from Yanshan petrochemical industry under the trade designation F8005-GD, has a melt mass flow rate of 5g/10min, measured at 230℃under a load of 2.16kg, and a copolymer rubber content of 4wt%.
Heterophasic polymer b-3, available from Basel under the trade designation C200F, had a melt mass flow rate of 6.3g/10min, measured at 230℃and a load of 2.16kg, and a copolymer rubber content of 52% by weight.
Random copolymer polypropylene, available from Yanshan petrochemical industry under the designation F4903-GD (abbreviated as d-1), has a melt mass flow rate of 3g/10min, measured at 230℃and under a load of 2.16kg, and the comonomer ethylene provides a content of structural units of 3.5% by weight.
Random copolymer polypropylene, available from Yanshan petrochemical industry under the designation F4904-GD (abbreviated as d-2), has a melt mass flow rate of 4g/10min, measured at 230℃and under a load of 2.16kg, and the comonomer ethylene provides a content of structural units of 7% by weight.
The ethylene copolymer was EAA, available from Exxon under the designation EAA5000 (abbreviated as c-1), and had a melt mass flow rate of 5.6g/10min, measured at 230℃under a load of 2.16kg, and the comonomer ethyl acrylate provided a content of 6% by weight.
The ethylene copolymer was EAA, available from Exxon under the designation EAA5100 (abbreviated as c-2), and had a melt mass flow rate of 8g/10min, measured at 230℃under a load of 2.16kg, and the comonomer ethyl acrylate provided 3% by weight of structural units.
1. In the present invention, the melt mass flow rate is determined according to GB/T3682-2000.
2. In the present invention, the method for testing the content of the dispersed phase provided by the copolymer rubber in the heterophasic polymer comprises: the sample is weighed to be W 1 Adding the mixture into boiling n-decane, stirring for 1 hour, cooling for 1 hour at room temperature, stirring for 1 hour at room temperature, and filtering to obtain a rubber phase in filtrate; the total weight of the filter paper and the stirrer is W 2 The method comprises the steps of carrying out a first treatment on the surface of the Adding the filtrate into 400ml of acetone under stirring, and stirring for 1 hour; filtering with filter paper, oven drying to obtain rubber phase, and weighing the filter paper, stirrer and rubber phase together to W 3 . The content of the dispersed phase provided by the copolymer rubber in the final heterophasic polymer was calculated as (W 3 -W 2 )/W 1 ×100％。
3. Film toughness: film toughness was characterized by means of pendulum impact resistance and tested according to standard GB/T8809-1988.
4. Corona layer adhesion properties: and heat-sealing the film and the aluminum foil under the heat-sealing condition of 190 ℃ and 0.3MPa for 2s, and testing the heat-sealing strength of the corona layer and the aluminum foil according to standard QB/T2358-98 to characterize the bonding performance of the corona layer.
5. Heat sealing performance: the film itself was heat sealed under heat sealing conditions of 0.3MPa for 2s, tested according to standard QB/T2358-98, and the corresponding temperature was recorded when the heat seal strength reached 7N/15mm, which temperature was the heat sealing temperature.
6. High temperature resistance: placing the film into a sterilizing pot, setting the temperature of the sterilizing pot to 131 ℃, taking out the film after 15min, and observing the film state.
7. Transparency: film haze was measured according to standard GB/T2410-2008.
Example 1
The preparation process of the film comprises the following steps: the mixture of the corona layer, the core layer and the heat sealing layer is respectively melted in three extruders, and the melt is extruded into a three-layer film through a slit (the slit gap is 0.4-0.65 mm) on a T-shaped machine head. The extruded film was applied to a chill roll with compressed air from an air knife. In the process of extruding the film through the cooling roller, the feeding speed and the drawing speed of the extruder are controlled, so that the final thickness of each layer of film is controlled. The total thickness of the polypropylene film is 50 mu m, the thickness of the corona layer is 10 mu m, the thickness of the core layer is 30 mu m, and the thickness of the heat seal layer is 10 mu m.
The specific compositions of the corona layer composition, the core layer composition and the heat seal layer composition in example 1 are shown in table 1.
Example 2-example 6, comparative example 1
Films were prepared according to the method of example 1, with the amounts and types of the various materials in the corona layer composition, core layer composition and heat seal layer composition being different, as shown in Table 1.
TABLE 1
Example 7
A film was prepared in the same proportion as in example 1, except that the content of rubber in the heterophasic polymer a-2 was 20% by weight; the content of rubber in the heterophasic polymer b-2 was 50wt%.
Example 8
A film was prepared in the same proportion as in example 1, except that the comonomer in the random copolymer polypropylene (d-2) provided a content of structural units of 7% by weight.
Example 9
A film was produced in the same proportion as in example 1, except that the ethylene copolymer (c-2) had a content of 3% by weight of structural units provided by the comonomer ethyl acrylate.
Comparative example 2
A film was prepared in the same proportion as in example 1, except that the content of the copolymer rubber in the heterophasic polymer a-3 was 4% by weight; the content of the copolymer rubber in the heterophasic polymer b-3 was 52% by weight.
Comparative example 3
A film was produced in the same proportion as in example 1, except that the content of the copolymer rubber in the heterophasic polymer b-3 was in the range of 52% by weight.
Comparative example 4
A film was prepared in the same proportion as in example 1, except that the content of the copolymer rubber in the heterophasic polymer a-3 was in the range of 4% by weight.
The results of the performance test of the films prepared in examples and comparative examples are shown in Table 2.
TABLE 2
As can be seen from Table 2, the film prepared by the technical scheme of the invention has better pendulum impact resistance and heat resistance, and simultaneously maintains better transparency and better heat sealing performance.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (14)
1. The polypropylene film is characterized by having a multilayer structure, wherein the film comprises a corona layer, a core layer and a heat sealing layer which are sequentially laminated;
wherein the corona layer is made from a corona layer composition comprising a heterophasic polymer a; the core layer is made of a core layer composition comprising a heterophasic polymer a and a heterophasic polymer b; the heat-seal layer is made of a heat-seal layer composition comprising a heterophasic polymer a;
the heterophasic polymer a and heterophasic polymer b each independently comprise a continuous phase provided by polypropylene and a dispersed phase provided by copolymer rubber;
the content of the dispersed phase provided by the copolymer rubber is 5 to 20wt% based on the total weight of the heterophasic high polymer a;
the content of the dispersed phase provided by the copolymer rubber is 30 to 50wt% based on the total weight of the heterophasic polymer b.
2. The polypropylene film according to claim 1, wherein the content of the dispersed phase provided by the copolymer rubber is 5 to 16wt% based on the total weight of the heterophasic polymer a;
and/or the content of the dispersed phase provided by the copolymer rubber is 30 to 40wt% based on the total weight of the heterophasic polymer b.
3. The polypropylene film according to claim 1 or 2, wherein the copolymer rubber is a copolymer of propylene with ethylene and/or butene;
preferably, the copolymer rubber is a propylene-ethylene copolymer rubber.
4. A polypropylene film according to any one of claims 1 to 3 wherein the heterophasic polymer a has a melt mass flow rate of 2 to 8g/10min as measured at 230 ℃ and a load of 2.16 kg;
preferably, the heterophasic polymer b has a melt mass flow rate of 2-8g/10min, measured at 230℃and under a load of 2.16 kg.
5. The polypropylene film according to any one of claims 1 to 4, wherein the copolymer rubber has a weight average molecular weight of 400000 to 600000g/mol.
6. The polypropylene film according to any one of claims 1 to 5 wherein the corona layer composition further comprises an ethylene copolymer which is a copolymer of ethylene with a monomer B selected from at least one of an α, β -unsaturated carboxylic acid, an α, β -unsaturated carboxylic acid ester and a vinyl carboxylic acid ester;
preferably, the content of structural units provided by the monomers B is from 1 to 10% by weight, based on the total weight of the ethylene copolymer.
7. The polypropylene film according to claim 6, wherein the heterophasic high polymer a is present in an amount of 90 to 99wt% and the ethylene copolymer is present in an amount of 1 to 10wt%, based on the total weight of the corona layer composition;
preferably, the heterophasic high polymer a is present in an amount of 92 to 99wt% and the ethylene copolymer is present in an amount of 1 to 8wt%, based on the total weight of the corona layer composition;
preferably, the heterophasic polymer a is present in an amount of 95 to 99wt% and the ethylene copolymer is present in an amount of 1 to 5wt%, based on the total weight of the corona layer composition.
8. The polypropylene film according to claim 6 or 7, wherein the ethylene copolymer has a melt mass flow rate of 2-8g/10min as measured at 230 ℃ and a load of 2.16 kg.
9. The polypropylene film according to any one of claims 1 to 8, wherein the heat-seal layer composition further comprises a propylene and comonomer random copolymer polypropylene;
preferably, the comonomer is selected from ethylene and/or alpha-olefins;
preferably, the alpha-olefin is C 4 -C 12 Preferably at least one of 1-butene, 1-hexene and 1-octene;
preferably, the content of structural units provided by the comonomer is 1 to 8wt%, based on the total weight of the random copolymer polypropylene.
10. The polypropylene film according to claim 9, wherein the heterophasic high polymer a is present in an amount of 80 to 99wt% and the random copolymer polypropylene is present in an amount of 1 to 20wt%, based on the total weight of the heat seal layer composition;
preferably, the content of the heterophasic high polymer a is 85 to 99wt% and the content of the random copolymer polypropylene is 1 to 15wt%, based on the total weight of the heat sealing layer composition;
preferably, the heterophasic polymer a is present in an amount of 90 to 99wt% and the random copolymer polypropylene is present in an amount of 1 to 10wt% based on the total weight of the heat seal composition.
11. The polypropylene film according to claim 9 or 10, wherein the random copolymer polypropylene has a melt mass flow rate of 2-8g/10min as measured at 230 ℃ and a load of 2.16 kg.
12. The polypropylene film according to any one of claims 1 to 11, wherein the heterophasic polymer a is present in an amount of 70 to 90wt% and the heterophasic polymer b is present in an amount of 10 to 30wt%, based on the total weight of the core composition;
preferably, the heterophasic polymer a is present in an amount of from 70 to 85wt% and the heterophasic polymer b is present in an amount of from 15 to 30wt%, based on the total weight of the core layer composition;
preferably, the heterophasic polymer a is present in an amount of 80 to 85wt% and the heterophasic polymer b is present in an amount of 15 to 20wt%, based on the total weight of the core composition.
13. The polypropylene film according to any one of claims 1 to 12, wherein the film is of a three-layer structure;
preferably, the thickness ratio of the corona layer, the core layer and the heat seal layer is 1:2-4:1.
14. Use of a polypropylene film according to any one of claims 1 to 13 in packaging applications.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210520343.5A CN117087280A (en) | 2022-05-12 | 2022-05-12 | Polypropylene film and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210520343.5A CN117087280A (en) | 2022-05-12 | 2022-05-12 | Polypropylene film and application thereof |
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| CN117087280A true CN117087280A (en) | 2023-11-21 |
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| CN202210520343.5A Pending CN117087280A (en) | 2022-05-12 | 2022-05-12 | Polypropylene film and application thereof |
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| CN (1) | CN117087280A (en) |
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