CN116494622B - Biaxially oriented polyethylene film, preparation method thereof and polyethylene laser color film - Google Patents
Biaxially oriented polyethylene film, preparation method thereof and polyethylene laser color film Download PDFInfo
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- CN116494622B CN116494622B CN202310768125.8A CN202310768125A CN116494622B CN 116494622 B CN116494622 B CN 116494622B CN 202310768125 A CN202310768125 A CN 202310768125A CN 116494622 B CN116494622 B CN 116494622B
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- -1 polyethylene Polymers 0.000 title claims abstract description 171
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 163
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 163
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000010410 layer Substances 0.000 claims abstract description 166
- 239000012792 core layer Substances 0.000 claims abstract description 89
- 238000006243 chemical reaction Methods 0.000 claims abstract description 55
- 239000002344 surface layer Substances 0.000 claims abstract description 51
- 229920005989 resin Polymers 0.000 claims abstract description 32
- 239000011347 resin Substances 0.000 claims abstract description 32
- 238000000465 moulding Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 69
- 238000002844 melting Methods 0.000 claims description 45
- 230000008018 melting Effects 0.000 claims description 44
- 239000000155 melt Substances 0.000 claims description 39
- 230000008033 biological extinction Effects 0.000 claims description 30
- 229920001577 copolymer Polymers 0.000 claims description 30
- 239000011159 matrix material Substances 0.000 claims description 27
- 229920001903 high density polyethylene Polymers 0.000 claims description 24
- 239000004700 high-density polyethylene Substances 0.000 claims description 24
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 21
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 21
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 11
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 9
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 239000003208 petroleum Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 238000007740 vapor deposition Methods 0.000 claims description 7
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 6
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims description 6
- QQONPFPTGQHPMA-UHFFFAOYSA-N Propene Chemical group CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 6
- 238000000748 compression moulding Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002216 antistatic agent Substances 0.000 claims description 5
- 238000003851 corona treatment Methods 0.000 claims description 5
- 229920002313 fluoropolymer Polymers 0.000 claims description 5
- 239000004811 fluoropolymer Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 229920001897 terpolymer Polymers 0.000 claims description 5
- QYMGIIIPAFAFRX-UHFFFAOYSA-N butyl prop-2-enoate;ethene Chemical compound C=C.CCCCOC(=O)C=C QYMGIIIPAFAFRX-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 3
- 229920006245 ethylene-butyl acrylate Polymers 0.000 claims description 3
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 claims description 3
- 229920006225 ethylene-methyl acrylate Polymers 0.000 claims description 3
- 229920005677 ethylene-propylene-butene terpolymer Polymers 0.000 claims description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 3
- 229920006027 ternary co-polymer Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 38
- 238000003825 pressing Methods 0.000 description 13
- 239000003963 antioxidant agent Substances 0.000 description 11
- 230000003078 antioxidant effect Effects 0.000 description 11
- 238000012545 processing Methods 0.000 description 9
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 7
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 3
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000004049 embossing Methods 0.000 description 3
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- 239000000758 substrate Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
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- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
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- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
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- 239000012790 adhesive layer Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
- B32B2255/205—Metallic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of polyethylene films, and particularly relates to a biaxially oriented polyethylene film, a preparation method thereof and a polyethylene laser color film. The biaxially oriented polyethylene film comprises a first surface layer, a core layer and a second surface layer in sequence; the first surface layer is a moldable bright layer, and the moldable bright layer comprises copolymerized polyethylene; the core layer comprises polyethylene; at the molding temperature of 100 ℃, the conversion rate of the moldable bright layer, namely the conversion rate of the core layer is more than or equal to 21% and less than or equal to 30%; wherein the conversion is the ratio of the specific enthalpy of the core layer or the moldable bright layer resin when partially melted to the specific enthalpy of the core layer or the moldable bright layer resin when fully melted at a test temperature of 100 ℃. The conversion rate of the moldable bright layer is larger than that of the core layer, so that the moldable bright layer can be favorably molded to have a laser color effect, and the method can be applied to the field of single-material polyethylene moldable laser color films.
Description
Technical Field
The invention belongs to the technical field of polyethylene films, and particularly relates to a biaxially oriented polyethylene film, a preparation method thereof and a polyethylene laser color film.
Background
Biaxially oriented polyethylene film, abbreviated as BOPE film, is a film made by stretching polyethylene resin synchronously or asynchronously in the longitudinal and transverse directions at a certain temperature and speed, and by appropriate cooling or heat treatment or special processing (such as corona). After being stretched, the molecular chains and platelets of the polyethylene are highly oriented along two directions, the optical performance and the mechanical performance are greatly improved, and the BOPE film is a very important soft packaging material which is colorless, odorless, tasteless and nontoxic, and has high tensile strength, impact strength and good transparency. BOPE is a commercially available product in recent years, and due to its molecular structure, ordinary polyethylene is difficult to biaxially stretch into a film, and a special metallocene linear low-density polyethylene raw material needs to be added.
The laser color film is a film with color effect prepared by laser image mould pressing treatment and laser protective layer evaporation medium treatment. The substrate layer is usually a biaxially oriented polypropylene film (BOPP film for short) with a thickness of 20-40 μm, wherein the BOPP film has the characteristics of high transparency, easy recovery, low cost and the like.
In practical application, BOPP film needs to be molded on a molding layer of a substrate film at 135 ℃, and the film with color effect is prepared by laser image molding treatment and laser protection layer vapor deposition medium treatment. However, the higher molding temperature tends to deform and burn the film on the one hand, and requires higher heat consumption for molding on the other hand.
Disclosure of Invention
Based on the above, the invention aims to provide an original biaxially oriented polyethylene film which can be molded at a lower molding temperature to achieve the same effect as a conventional biaxially oriented polypropylene moldable film, wherein the moldable bright layer is a laser molding layer, the conversion rate of the moldable bright layer is larger than that of the core layer, the laser molding layer is beneficial to realizing low-temperature molding, and the addition of polyethylene in the core layer is beneficial to increasing the stiffness and heat resistance of the film, so that the biaxially oriented polypropylene film can be applied to the field of single-material polyethylene laser color films.
The invention is realized by the following technical scheme:
the biaxially oriented polyethylene film sequentially comprises a first surface layer, a core layer and a second surface layer;
the first surface layer is a moldable bright layer, and the moldable bright layer comprises copolymerized polyethylene;
the core layer comprises polyethylene;
at the molding temperature of 100 ℃, the conversion rate of the moldable bright layer, namely the conversion rate of the core layer is more than or equal to 21% and less than or equal to 30%; wherein the conversion is the ratio of the specific enthalpy of the core layer or the moldable bright layer resin when partially melted to the specific enthalpy of the core layer or the moldable bright layer resin when fully melted at a test temperature of 100 ℃.
According to the biaxially oriented polyethylene film disclosed by the invention, the core layer and the moldable bright layer are made of different types of polyethylene, the conversion ratio difference between the core layer and the moldable bright layer at the molding temperature of 100 ℃ is controlled by controlling the components of the core layer and the moldable bright layer, and the conversion ratio difference between the moldable bright layer and the core layer is controlled within a certain range, namely between 21 and 30 percent, so that the moldable bright layer can be used as a low-temperature molding layer on one hand, and the low-temperature molding can be realized on the surface of the moldable bright layer; on the other hand, the core layer can reduce deformation at the molding temperature, so that only the surface layer of the three-layer film structure has an embossing effect after molding, and meanwhile, the rupture of films in the stretching process can be reduced, and the method can be applied to the field of polyethylene laser color films. If the conversion rate difference between the moldable bright layer and the core layer is too low, the melting conversion rates of the two layers of resin are close to each other at the same temperature, the whole film is easy to deform during molding, so that the film cannot be used later, and if the conversion rate difference between the moldable bright layer and the core layer is too high, the fact that the melting conversion rate of the moldable bright layer is too high is indicated, the temperature resistance is poor, the situation of adhesion with a press roller is easy to occur during molding, and the film cannot be molded into a specific shape is caused.
Further, the polyethylene in the core layer is at least one of high-density polyethylene, medium-density polyethylene, low-density polyethylene and linear low-density polyethylene. Polyethylene with different densities is selected, so that the film forming property is ensured, and meanwhile, the stiffness and the heat resistance are improved.
As a preferred embodiment, the core layer comprises 60 to 90wt% of linear low density polyethylene, 10 to 40wt% of high density polyethylene, and not more than 4wt% of antistatic agent. The proportion of each component in the core layer is regulated, so that the film forming property is ensured, meanwhile, the stiffness and the heat resistance are improved better, and the antistatic agent is added, so that the surface static electricity is reduced in the subsequent winding process.
Further, the linear low density polyethylene has a melting point of 120-130 ℃, and the high density polyethylene has a melting point of 130-140 ℃. The type of polyethylene is selected according to the melting point to ensure the regulation and control of the conversion rate of the core layer and the moldable luminescent layer.
Further, the melt index of the linear low-density polyethylene is 1-5g/10min (190 ℃,2.16 kg), and the melt index of the high-density polyethylene is 0.1-3 g/10min (190 ℃,2.16 kg). The polyethylene with the melt index range is adopted, so that the core layer has fluidity suitable for processing in a processing temperature window.
As a preferred embodiment, the moldable bright layer comprises 98wt% of a copolymer polyethylene and 2wt% of an anti-adhesion agent; in the moldable bright layer, the melting point of the copolymer polyethylene is 110-125 ℃, and the melt index is 1-5g/10min (190 ℃,2.16 kg).
As a preferred scheme, the second surface layer is a matting layer, and the matting layer comprises 25-40wt% of copolymerized polyethylene, 35-70wt% of polypropylene, 2-10wt% of a first master batch and 2-10wt% of a second master batch; the first masterbatch includes a first masterbatch matrix and a hydrogenated petroleum resin, and the second masterbatch includes a second masterbatch matrix and a fluoropolymer processing aid. The second surface layer is a extinction layer, the second surface layer is used as a gluing composite layer, and the concave-convex surface of the extinction layer is favorable for being coated with an adhesive to form an adhesive layer. In the extinction layer, hydrogenated petroleum resin is added to facilitate the uniform dispersion of the extinction layer, so that the extinction effect is improved, the fluoropolymer processing aid can form a layer of smooth film in the processing process, extrusion processing of the extinction layer is facilitated, die head precipitation is reduced, and the extinction effect and extinction uniformity of the extinction layer can be better by adopting a proper proportion. Preferably, the first masterbatch matrix and the second masterbatch matrix are both copolymerized polyethylene.
Further, the matting layer further comprises 5wt% of an antioxidant masterbatch comprising a third masterbatch matrix and an antioxidant, the third masterbatch matrix being a copolymerized polyethylene.
Preferably, the copolymer polyethylene in the matting layer has a melting point of 123℃and a melt index in the range of 10-20g/10min (190℃2.16 kg).
Further, the copolymerized polyethylene in the moldable bright layer and the copolymerized polyethylene in the matting layer each include one or more of a copolymer and a terpolymer.
Further, the binary copolymer can be selected from a copolymer polyethylene formed by copolymerizing one of 1-propylene, 1-butene, 1-hexene or 1-octene with ethylene, and the binary copolymer can also be selected from one of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-butyl acrylate copolymer; the terpolymer includes an ethylene-propylene-butene terpolymer.
Further, the moldable bright layer has a thickness of 2-3 μm; the thickness of the extinction layer is 2-3 mu m; the thickness of the biaxially oriented polyethylene film is 20-40 mu m. If the thickness of the extinction layer is too large, film formation is difficult to be carried out during production of the biaxially oriented polyethylene film, and the production cost is increased; if the thickness of the matting layer is too small, it is difficult to obtain a rough surface and achieve a good matting effect.
The invention also provides a preparation method of the biaxially oriented polyethylene film, which comprises the following steps:
co-extruding the first skin layer, the core layer and the second skin layer and cooling the first skin layer, the core layer and the second skin layer into a resin sheet; subjecting the resin sheet to longitudinal stretching and transverse stretching; and carrying out corona treatment on the first surface layer and the second surface layer, and rolling.
The invention also provides a polyethylene laser color film, which comprises any one of the biaxially oriented polyethylene film and a laser mould pressing treatment layer, wherein the laser mould pressing treatment layer is formed on the surface of the first surface layer of the biaxially oriented polyethylene film after laser image mould pressing treatment and laser protection layer evaporation medium treatment. Finally preparing the polyethylene laser color film with color effect.
Detailed Description
The invention provides a biaxially oriented polyethylene film, which sequentially comprises a first surface layer, a core layer and a second surface layer;
the first surface layer is a moldable bright layer, and the moldable bright layer comprises copolymerized polyethylene;
the core layer comprises polyethylene;
at the molding temperature of 100 ℃, the conversion rate of the moldable bright layer, namely the conversion rate of the core layer is more than or equal to 21% and less than or equal to 30%; wherein the conversion is the ratio of the specific enthalpy of the core layer or the moldable bright layer resin when partially melted to the specific enthalpy of the core layer or the moldable bright layer resin when fully melted at a test temperature of 100 ℃.
Preferably, the polyethylene in the core layer is at least one of high density polyethylene, medium density polyethylene, low density polyethylene, and linear low density polyethylene. Polyethylene of different densities is selected to ensure film forming properties while improving heat shrinkage.
Preferably, the core layer comprises 60 to 90wt% of linear low density polyethylene, 10 to 40wt% of high density polyethylene, and not more than 4wt% of antistatic agent. The proportion of each component is regulated, so that the film forming property is ensured, the heat shrinkage is improved, and the antistatic agent is added, so that the surface static electricity is weakened, and the subsequent winding process is facilitated.
Preferably, the linear low density polyethylene has a melting point of 120-130 ℃ and the high density polyethylene has a melting point of 130-140 ℃. The type of polyethylene is selected to ensure regulation of the conversion of the core layer and the moldable luminescent layer.
Preferably, the melt index of the linear low-density polyethylene is 1-5g/10min (190 ℃,2.16 kg), and the melt index of the high-density polyethylene is 0.1-3 g/10min (190 ℃,2.16 kg). The polyethylene with the melt index range is adopted, so that the core layer has fluidity suitable for processing in a processing temperature window.
Preferably, the copolymer polyethylene in the moldable bright layer has a melting point of 110℃to 125℃and a melt index in the range of 1 to 5g/10min (190℃2.16 kg).
Preferably, the matting layer comprises 25 to 40wt% of a copolymerized polyethylene, 35 to 70wt% of polypropylene, 2 to 10wt% of a first masterbatch and 2 to 10wt% of a second masterbatch; the first masterbatch includes a first masterbatch matrix and a hydrogenated petroleum resin, and the second masterbatch includes a second masterbatch matrix and a fluoropolymer processing aid. The hydrogenated petroleum resin is added to facilitate the uniform dispersion of the extinction layer, so that the extinction effect is improved, the fluoropolymer processing aid can form a layer of smooth film in the processing process, the extrusion processing of the extinction layer is facilitated, the precipitation of a die head is reduced, and the extinction effect and extinction uniformity of the extinction layer can be better by adopting a proper proportion.
Preferably, the copolymer polyethylene in the matting layer has a melting point of 123℃and a melt index in the range of 10-20g/10min (190℃2.16 kg).
Preferably, the copolymerized polyethylene in the moldable bright layer and the copolymerized polyethylene in the matting layer each include one or more of a copolymer and a terpolymer; the binary copolymer can be selected from copolymerized polyethylene formed by copolymerization of one of 1-propylene, 1-butene, 1-hexene or 1-octene and ethylene, and can also be selected from one of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-butyl acrylate copolymer; the terpolymer includes an ethylene-propylene-butene terpolymer.
Preferably, the moldable bright layer has a thickness of 2-3 μm; the thickness of the extinction layer is 2-3 mu m; the thickness of the biaxially oriented polyethylene film is 20-40 mu m. If the thickness of the extinction layer is too large, film formation is difficult to be carried out during production of the biaxially oriented polyethylene film, and the production cost is increased; if the thickness of the matting layer is too small, it is difficult to obtain a rough surface and achieve a good matting effect.
The invention also provides a preparation method of the biaxially oriented polyethylene film, which comprises the following steps:
co-extruding and cooling the first surface layer, the core layer and the second surface layer to form a resin sheet; subjecting the resin sheet to longitudinal stretching and transverse stretching; and carrying out corona treatment on the first surface layer and the second surface layer, and rolling.
According to the preparation method of the biaxially oriented polyethylene film, the first surface layer, the core layer and the second surface layer are co-extruded to achieve a good combination effect, and the biaxially oriented polyethylene film capable of being molded at low temperature is produced through a biaxially oriented process and can be applied to the field of polyethylene laser color films.
The invention also provides a polyethylene laser color film, which comprises the biaxially oriented polyethylene film and a laser mould pressing treatment layer, wherein the laser mould pressing treatment layer is attached to the first surface layer.
The polyethylene laser color film comprises any one of the biaxially oriented polyethylene film and a laser mould pressing treatment layer, wherein the laser mould pressing treatment layer is formed on the surface of a first surface layer of the biaxially oriented polyethylene film after laser image mould pressing treatment and laser protection layer evaporation medium treatment. Finally preparing the polyethylene laser color film with color effect.
As a preferable scheme, the laser molding layer treatment layer comprises a laser information layer and a vapor deposition layer; the laser information layer is a low-temperature molded pattern formed by performing laser low-temperature molding treatment on the surface of the first surface layer of the biaxially oriented polypropylene film; the vapor deposition layer is formed on the laser information layer by vapor deposition, and the preferable vapor deposition layer is an aluminum layer.
Example 1
The embodiment 1 provides a biaxially oriented polyethylene film, which sequentially comprises a first surface layer, a core layer and a second surface layer.
The first skin layer was a moldable bright layer comprising 98wt% of a copolymerized polyethylene of ethylene-octene copolymer having a melting point of 120℃and a melt index of 1.5g/10min (190 ℃,2.16 kg) and 2wt% of an anti-sticking agent.
The core layer comprised 69wt% linear low density polyethylene having a melting point of 127℃and a melt index of 1.7g/10min (190 ℃,2.16 kg), 30wt% high density polyethylene having a melting point of 138℃and a melt index of 1.2g/10min (190 ℃,2.16 kg), and 1wt% antistatic masterbatch.
The conversion of the core layer was 13% at 100 ℃, the conversion of the first skin layer was 38%, and the difference between the conversion of the first skin layer and the core layer at 100 ℃ was 25%.
The second skin layer is a matting layer comprising 40wt% of a copolymerized polyethylene, 35wt% of a polypropylene, 10wt% of a first masterbatch, 10wt% of a second masterbatch, and 5wt% of an antioxidant masterbatch. Wherein the polypropylene is an ethylene-propylene binary copolymer with a melt index of 3g/10min (190 ℃ C., 2.16 kg). The first master batch comprises 60wt% of a first master batch matrix and 40wt% of hydrogenated petroleum resin, wherein the first master batch matrix is copolymerized polyethylene. The second masterbatch comprises 97wt% of a second masterbatch matrix and 3wt% of a PPA processing aid, the second masterbatch matrix being a copolymerized polyethylene and the PPA processing aid being a commercially available fluoroelastomer. The antioxidant masterbatch comprises 90wt% of a third masterbatch matrix which is a copolymerized polyethylene and 10wt% of an antioxidant which is commercially available as antioxidant 1010. The copolymer polyethylene in the extinction layer is copolymer polyethylene of ethylene and butene, the melting point is 124 ℃, and the melt index is 15g/10min (190 ℃,2.16 kg).
The embodiment 1 also provides a preparation method of the biaxially oriented polyethylene film, which comprises the following steps:
introducing the first surface layer, the core layer and the second surface layer into an extruder for coextrusion, and converging at a T-shaped die after passing through a flow channel distributor to form a resin melt, wherein the extrusion temperature is 250 ℃; cooling by a chilled roller at 28 ℃ and casting to obtain a resin sheet;
longitudinally stretching the resin sheet 5 times after preheating at 120 ℃, then introducing the resin sheet into transverse stretching equipment, transversely stretching 8.5 times after preheating at 140 ℃, and finally rolling after corona treatment; and (3) carrying out aging treatment, cutting according to actual required specifications, and packaging to obtain the biaxially oriented polyethylene film, wherein the thicknesses of the first surface layer and the second surface layer are 2 mu m, and the thickness of the core layer is 21 mu m.
Example 2
This example 2 provides a biaxially oriented polyethylene film similar to that described in example 1, with the main differences that:
the core layer comprised 89wt% linear low density polyethylene having a melting point of 127℃and a melt index of 1.7g/10min (190 ℃,2.16 kg), 10wt% high density polyethylene having a melting point of 138℃and a melt index of 1.2g/10min (190 ℃,2.16 kg) and 1wt% antistatic masterbatch.
The conversion of the core layer was 17% at 100 ℃, the conversion of the first skin layer was 38%, and the difference between the conversion of the first skin layer and the core layer at 100 ℃ was 21%.
The present example 2 also provides a method for preparing the biaxially oriented polyethylene film, which is substantially the same as that of example 1. The biaxially oriented polyethylene film of example 2, wherein the first skin layer and the second skin layer each have a thickness of 2 μm and the core layer has a thickness of 21 μm.
Example 3
This example 3 provides a biaxially oriented polyethylene film similar to that described in example 1, with the main differences that:
the core layer comprised 60wt% linear low density polyethylene having a melting point of 127℃and a melt index of 1.7g/10min (190 ℃,2.16 kg), 39wt% high density polyethylene having a melting point of 138℃and a melt index of 1.2g/10min (190 ℃,2.16 kg) and 1wt% antistatic masterbatch.
The conversion of the core layer was 8% at 100 ℃, the conversion of the first skin layer was 38%, and the difference between the conversion of the first skin layer and the core layer at 100 ℃ was 30%.
This example 3 also provides a method for preparing the biaxially oriented polyethylene film described above, which is substantially the same as example 1. The biaxially oriented polyethylene film of example 2, wherein the first skin layer and the second skin layer each have a thickness of 2 μm and the core layer has a thickness of 21 μm.
Comparative example 1
This comparative example 1 provides a biaxially oriented polyethylene film comprising, in order, a first skin layer, a core layer and a matting layer;
the first skin layer comprised 98wt% of an ethylene-octene copolymerized polyethylene having a melting point of 127℃and a melt index of 5.5g/10min (190 ℃,2.16 kg) and 2wt% of an antiblocking masterbatch.
The core layer comprised 69wt% linear low density polyethylene having a melting point of 127℃and a melt index of 1.7g/10min (190 ℃,2.16 kg), 30wt% high density polyethylene having a melting point of 138℃and a melt index of 1.2g/10min (190 ℃,2.16 kg), and 1wt% antistatic masterbatch.
The conversion of the core layer was 17% at 100 ℃, the conversion of the first skin layer was 22%, and the difference between the conversion of the first skin layer and the core layer at 100 ℃ was 5%.
The matting layer comprises 40wt% of a copolymerized polyethylene, 35wt% of polypropylene, 10wt% of a first masterbatch, 10wt% of a second masterbatch, and 5wt% of an antioxidant masterbatch. Wherein the polypropylene is an ethylene-propylene binary copolymer with a melt index of 3g/10min (190 ℃ C., 2.16 kg). The first master batch comprises 60wt% of a first master batch matrix and 40wt% of hydrogenated petroleum resin, wherein the first master batch matrix is copolymerized polyethylene. The second masterbatch comprises 97wt% of a second masterbatch matrix and 3wt% of a PPA processing aid, the second masterbatch matrix being a copolymerized polyethylene and the PPA processing aid being a commercially available fluoroelastomer. The antioxidant masterbatch comprises 90wt% of a third masterbatch matrix which is a copolymerized polyethylene and 10wt% of an antioxidant which is commercially available as antioxidant 1010. The copolymer polyethylene in the extinction layer is copolymer polyethylene of ethylene and butene, the melting point is 123 ℃, and the melt index is 15g/10min (190 ℃,2.16 kg).
This comparative example 1 also provides a method of preparing the biaxially oriented polyethylene film described above, comprising the steps of:
introducing the first surface layer, the core layer and the extinction layer into an extruder for coextrusion, and converging at a T-shaped die after passing through a runner distributor to form a resin melt, wherein the extrusion temperature is 250 ℃; cooling by a chilled roller at 28 ℃ and casting to obtain a resin sheet;
longitudinally stretching the resin sheet 5 times after preheating at 120 ℃, then introducing the resin sheet into transverse stretching equipment, transversely stretching 8.5 times after preheating at 140 ℃, and finally rolling after corona treatment;
and (3) carrying out aging treatment, cutting according to the actual specification, and packaging to obtain the biaxially oriented polyethylene film, wherein the thickness of the first surface layer is 2 mu m, the thickness of the core layer is 21 mu m, and the thickness of the extinction layer is 2 mu m.
In comparative example 1, the first skin layer was made of a copolymer polyethylene having a conventional melting point and melt index, resulting in too low a conversion rate of the first skin layer at 100℃and a conversion rate of the core layer approaching, and insufficient temperature at the time of heat molding, and a specific shape could not be molded on the surface of the first skin layer in the subsequent step.
Comparative example 2
This comparative example 2 provides a biaxially oriented polyethylene film comprising, in order, a first skin layer, a core layer and a matting layer;
the first skin layer comprised 98wt% of an ethylene-octene copolymerized polyethylene having a melting point of 120℃and a melt index of 1.5g/10min (190 ℃,2.16 kg) and 2wt% of an antiblocking masterbatch.
The core layer comprised 49wt% linear low density polyethylene having a melting point of 127℃and a melt index of 1.7g/10min (190 ℃,2.16 kg), 50 wt% high density polyethylene having a melting point of 138℃and a melt index of 1.2g/10min (190 ℃,2.16 kg), and 1wt% antistatic masterbatch.
The matting layer comprises 40wt% of a copolymerized polyethylene, 35wt% of a polyethylene, 10wt% of a first masterbatch, 10wt% of a second masterbatch, and 5wt% of an antioxidant masterbatch. Wherein the polypropylene is an ethylene-propylene copolymer having a melt index of 3g/10min (190 ℃ C., 2.16 kg). The first master batch comprises 60wt% of a first master batch matrix and 40wt% of hydrogenated petroleum resin, wherein the first master batch matrix is copolymerized polyethylene. The second masterbatch comprises 97wt% of a second masterbatch matrix and 3wt% of a PPA processing aid, the second masterbatch matrix being a copolymerized polyethylene and the PPA processing aid being a commercially available fluoroelastomer. The antioxidant masterbatch comprises 90wt% of a third masterbatch matrix which is a copolymerized polyethylene and 10wt% of an antioxidant which is commercially available as antioxidant 1010. The copolymer polyethylene in the extinction layer is copolymer polyethylene of ethylene and butene, the melting point is 124 ℃, and the melt index is 15g/10min (190 ℃,2.16 kg).
In the preparation process of the biaxially oriented polyethylene film of the comparative example 2, the high-multiple biaxially oriented polyethylene cannot be performed due to the excessively large proportion of the high-density polyethylene in the core layer, so that film formation is difficult, and particularly the biaxially oriented polyethylene film of the comparative example 2 has large pressure during extrusion, low efficiency, cannot be biaxially oriented, and cannot be formed.
Comparative example 3
Comparative example 3 provides a biaxially oriented polyethylene film similar to that described in comparative example 2, with the main difference that:
the core layer comprised 94wt% linear low density polyethylene having a melting point of 127℃and a melt index of 1.7g/10min (190 ℃,2.16 kg), 5wt% high density polyethylene having a melting point of 138℃and a melt index of 1.2g/10min (190 ℃,2.16 kg) and 1wt% antistatic masterbatch.
The conversion of the core layer was 18% at 100 ℃, the conversion of the first skin layer was 38%, and the difference between the conversion of the first skin layer and the core layer at 100 ℃ was 20%.
The comparative example 3 also provides a method for preparing the biaxially oriented polyethylene film, wherein the biaxially oriented polyethylene film of the comparative example 3 has a thickness of 2 μm for both the first surface layer and the second surface layer, and a thickness of 21 μm for the core layer.
Comparative example 4
Comparative example 4 provides a biaxially oriented polyethylene film similar to that described in comparative example 2, with the main difference that:
the core layer comprised 69wt% linear low density polyethylene having a melting point of 117℃and a melt index of 5.5g/10min (190 ℃,2.16 kg), 30wt% high density polyethylene having a melting point of 138℃and a melt index of 1.2g/10min (190 ℃,2.16 kg), and 1wt% antistatic masterbatch.
In the preparation process of the biaxially oriented polyethylene film of comparative example 4, film formation was impossible.
Comparative example 5
Comparative example 5 provides a biaxially oriented polyethylene film similar to that described in comparative example 2, with the main difference that:
the core layer comprised 69wt% linear low density polyethylene having a melting point of 127℃and a melt index of 1.7g/10min (190 ℃,2.16 kg), 30wt% high density polyethylene having a melting point of 143℃and a melt index of 0.8g/10min (190 ℃,2.16 kg), and 1wt% antistatic masterbatch.
In the preparation process of the biaxially oriented polyethylene film of comparative example 5, film formation was impossible.
Comparative example 6
Comparative example 6 provides a biaxially oriented polyethylene film similar to that described in example 2, with the main differences:
the first skin layer comprised 98wt% of a copolymer polyethylene having a melting point of 95℃and a melt index of 15g/10min (190 ℃,2.16 kg) and 2wt% of an antiblocking masterbatch.
The conversion of the core layer was 17% at 100 ℃, the conversion of the first skin layer was 49%, and the difference between the conversion of the first skin layer and the core layer at 100 ℃ was 32%.
This comparative example 6 also provides a method for producing the biaxially oriented polyethylene film described above, which is the same as comparative example 1. The biaxially oriented polyethylene film of comparative example 6, wherein the first skin layer and the second skin layer each had a thickness of 2 μm and the core layer had a thickness of 21. Mu.m.
Example 4
The embodiment 4 provides a polyethylene laser color film, which comprises the biaxially oriented polyethylene film and the laser compression molding treatment layer according to any one of the embodiments 1 to 3, wherein the laser compression molding treatment layer is formed by performing laser image compression molding treatment and laser protection layer vapor deposition medium treatment on the surface of the first surface layer of the biaxially oriented polyethylene film.
For convenience of comparison, biaxially oriented polyethylene films prepared in comparative examples 1 to 6 were further prepared into polyethylene laser color films, specifically:
the nickel plate containing the laser holographic image is arranged on a plate roller of a mould pressing device, and then the biaxially oriented polyethylene films prepared in examples 1-3 and comparative examples 1-6 are respectively conveyed between the plate roller and a press roller of the mould pressing device after being preheatedEmbossing, namely controlling the embossing temperature of the surface (namely the embossing surface) of the first surface layer of the film to 100 ℃, controlling the temperature of a plate roller to 50 ℃ and controlling the pressure of a press roller to 12kg/cm 2 The stamping speed is controlled at 45m/min, so that a laser holographic image is stamped on a laser stamping layer (namely a first surface layer), and then an aluminum layer is evaporated on the prepared laser information layer in vacuum evaporation equipment, so that the polyethylene laser color film is obtained.
The biaxially oriented polyethylene films of examples 1 to 3 and comparative examples 1 to 6 were subjected to performance test: the biaxially oriented polyethylene film is subjected to a thermal shrinkage test by adopting the national test standard GB/T13519-92, the test is carried out in a constant temperature oven with the temperature of 120 ℃ for increasing the identification degree, the test time is prolonged to 2min from 20s of the national standard, meanwhile, the conversion rate and the difference value between the moldable bright layer (namely the first surface layer) and the core layer at the temperature of 100 ℃ are detected by using a differential scanning calorimeter DSC, and the test result is shown in the table 1-1:
TABLE 1-1 biaxially oriented polyethylene film Performance test
As shown in Table 1-1, the biaxially oriented polyethylene films of examples 1-3 have a low haze, a low heat shrinkage ratio of 21% or less and a conversion ratio of the first skin layer of 30% or less, and a higher conversion ratio of the first skin layer and the core layer are more advantageous for low-temperature molding under the premise of ensuring film forming properties.
Comparative example 1, although haze is low, after the first skin layer adopts the copolymer polyethylene with conventional melting point and melt index, the difference between the conversion rate of the first skin layer and the conversion rate of the core layer is 5%, and the difference is too small, so that the low-temperature mould pressing is not facilitated, and the adhesion and wrinkling phenomenon are easy to occur during the mould pressing; in comparative example 2, the high-multiple biaxially oriented film cannot be formed due to the excessively large proportion of the high-density polyethylene in the core layer, and the film cannot be formed, and in particular, in comparative example 2, the extrusion pressure is high, the efficiency is low, and the biaxially oriented film cannot be stretched. The difference between the conversion rate of the first surface layer and the conversion rate of the core layer in the biaxially oriented polyethylene film of comparative example 3 is 20%, although biaxially oriented, the conversion rate of the first surface layer is a special low-melting point copolymer polyethylene, the conversion rate of the first surface layer and the conversion rate of the core layer are too small, the addition amount of the high-density polyethylene of the core layer is too small, the temperature resistances of the first surface layer and the core layer are close, the heat shrinkage rate exceeds 5%, and the deformation problem easily occurs in the subsequent molding process. In comparative example 4, the core layer uses linear low-density polyethylene with low melting point and high melt index, and has strong molecular crystallization capability and high crystallization speed, so that the problems of uneven film thickness and film rupture easily occur in the biaxial stretching process, the requirement of the biaxial stretching process is difficult to meet, and the biaxial stretching film cannot be formed. Compared with comparative example 4, the biaxially oriented polyethylene film of the invention has a core layer made of linear low density polyethylene with high melting point and low melt index after the design of special molecular structure, has a low crystallization speed, and can be biaxially oriented into a polyethylene film with uniform thickness and high transparency. Comparative example 5, to which high-density polyethylene having a high melting point was added, was not stretched into a film, and it was necessary to use a high-density polyethylene resin polymerized with a specific molecular structure to biaxially stretch into a film, similarly to comparative example 4. Comparative example 6 used a lower melting point copolymer polyethylene, but the lower melting point caused the film to melt completely at the time of molding, and the press roll for molding caused blocking, and could not be molded into a desired shape on the film skin.
Compared with the prior art, the biaxially oriented polyethylene film provided by the invention has the advantages that the first surface layer is a moldable bright layer, the moldable bright layer can be molded into a laser color substrate film at a low temperature, and the conversion rate of the moldable bright layer, namely the conversion rate of the core layer, is more than or equal to 21% and less than or equal to 30% at the molding temperature of 100 ℃. The conversion rate of the moldable bright layer is controlled to be larger than that of the core layer, the moldable bright layer is favorably molded to obtain a laser color effect, the second surface layer is a extinction layer, the concave-convex surface of the extinction layer is favorable for compounding after being coated with an adhesive, and the moldable bright layer can be applied to the field of single-material polyethylene moldable laser color films.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention, and the invention is intended to encompass such modifications and improvements.
Claims (6)
1. A biaxially oriented polyethylene film for a polyethylene laser color film, characterized by:
sequentially comprises a first surface layer, a core layer and a second surface layer;
the first skin layer is a moldable bright layer comprising 98wt% ethylene-octene copolymer and 2wt% anti-tack agent; in the moldable bright layer, the ethylene-octene copolymer has a melting point of 120 ℃ and a melt index of 1.5g/10min;
the core layer comprises 60-90wt% of linear low density polyethylene, 10-40wt% of high density polyethylene, and no more than 4wt% of antistatic agent; the melting point of the linear low-density polyethylene is 120-130 ℃, and the melting point of the high-density polyethylene is 130-140 ℃; the melt index of the linear low-density polyethylene is 1-5g/10min, and the melt index of the high-density polyethylene is 0.1-3 g/10min;
at the molding temperature of 100 ℃, the conversion rate of the moldable bright layer, namely the conversion rate of the core layer is more than or equal to 21% and less than or equal to 30%; wherein the conversion is the ratio of the specific enthalpy of the core layer or the moldable bright layer resin when partially melted to the specific enthalpy of the core layer or the moldable bright layer resin when fully melted at a test temperature of 100 ℃.
2. The biaxially oriented polyethylene film for polyethylene laser color film according to claim 1, wherein: the second surface layer is a extinction layer, and the extinction layer comprises 25-40wt% of copolymerized polyethylene, 35-70wt% of polypropylene, 2-10wt% of first master batch and 2-10wt% of second master batch; the first master batch comprises a first master batch matrix and hydrogenated petroleum resin, and the second master batch comprises a second master batch matrix and a fluoropolymer processing aid; the first master batch matrix and the second master batch matrix are both copolymerized polyethylene.
3. The biaxially oriented polyethylene film for polyethylene laser color film according to claim 2, wherein: the copolymerized polyethylene in the extinction layer comprises one or more of a binary copolymer and a ternary copolymer; the binary copolymer is copolymerized polyethylene formed by copolymerizing one of 1-propylene, 1-butene, 1-hexene or 1-octene with ethylene, or one of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-butyl acrylate copolymer; the terpolymer includes an ethylene-propylene-butene terpolymer.
4. The biaxially oriented polyethylene film for polyethylene laser color film according to claim 2, wherein: the thickness of the moldable bright layer is 2-3 mu m; the thickness of the extinction layer is 2-3 mu m; the thickness of the biaxially oriented polyethylene film for the polyethylene laser color film is 20-40 mu m.
5. A method for producing a biaxially oriented polyethylene film for a polyethylene laser color film according to any one of claims 1 to 4, wherein: the method comprises the following steps:
co-extruding and cooling the first skin layer, the core layer and the second skin layer into a resin sheet; subjecting the resin sheet to longitudinal stretching and transverse stretching; and carrying out corona treatment on the first surface layer and the second surface layer, and rolling.
6. A polyethylene laser color film, characterized by: the biaxially oriented polyethylene film for the polyethylene laser color film comprises the biaxially oriented polyethylene film for the polyethylene laser color film and a laser compression molding treatment layer, wherein the laser compression molding treatment layer is formed on the surface of the first surface layer of the biaxially oriented polyethylene film for the polyethylene laser color film after laser image compression molding treatment and laser protection layer vapor deposition medium treatment.
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