CN116278267A - BOPE (biaxially oriented polyethylene) adhesive-free film, preparation method thereof and thermal composite sheet - Google Patents
BOPE (biaxially oriented polyethylene) adhesive-free film, preparation method thereof and thermal composite sheet Download PDFInfo
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- CN116278267A CN116278267A CN202310558297.2A CN202310558297A CN116278267A CN 116278267 A CN116278267 A CN 116278267A CN 202310558297 A CN202310558297 A CN 202310558297A CN 116278267 A CN116278267 A CN 116278267A
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- ethylene
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- copolymer
- bope
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- 239000002131 composite material Substances 0.000 title claims abstract description 34
- -1 polyethylene Polymers 0.000 title claims description 32
- 238000002360 preparation method Methods 0.000 title abstract description 27
- 239000004698 Polyethylene Substances 0.000 title description 10
- 229920000573 polyethylene Polymers 0.000 title description 9
- 239000002344 surface layer Substances 0.000 claims abstract description 198
- 239000002346 layers by function Substances 0.000 claims abstract description 152
- 239000002775 capsule Substances 0.000 claims abstract description 107
- 239000002313 adhesive film Substances 0.000 claims abstract description 62
- 239000012792 core layer Substances 0.000 claims abstract description 55
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 49
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 claims abstract description 37
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000010030 laminating Methods 0.000 claims abstract description 8
- 239000010408 film Substances 0.000 claims description 113
- 229920001577 copolymer Polymers 0.000 claims description 101
- 239000010410 layer Substances 0.000 claims description 92
- 238000000034 method Methods 0.000 claims description 71
- 230000008569 process Effects 0.000 claims description 62
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 55
- 239000000155 melt Substances 0.000 claims description 47
- 229920005989 resin Polymers 0.000 claims description 36
- 239000011347 resin Substances 0.000 claims description 36
- 238000002844 melting Methods 0.000 claims description 34
- 230000008018 melting Effects 0.000 claims description 34
- 239000002245 particle Substances 0.000 claims description 23
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 21
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 20
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 20
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 19
- 239000000377 silicon dioxide Substances 0.000 claims description 17
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims description 16
- 239000010409 thin film Substances 0.000 claims description 16
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 11
- 239000000178 monomer Substances 0.000 claims description 11
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 11
- 230000008033 biological extinction Effects 0.000 claims description 9
- 239000002981 blocking agent Substances 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- 238000009966 trimming Methods 0.000 claims description 9
- 238000003851 corona treatment Methods 0.000 claims description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims description 6
- 230000009477 glass transition Effects 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 238000013329 compounding Methods 0.000 abstract description 31
- 238000007639 printing Methods 0.000 abstract description 15
- 229920003023 plastic Polymers 0.000 abstract description 11
- 239000004033 plastic Substances 0.000 abstract description 11
- 238000004049 embossing Methods 0.000 abstract description 8
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 24
- 239000000123 paper Substances 0.000 description 20
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 18
- 238000007731 hot pressing Methods 0.000 description 16
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000007888 film coating Substances 0.000 description 8
- 238000009501 film coating Methods 0.000 description 8
- 229920000877 Melamine resin Polymers 0.000 description 6
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000003490 calendering Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 238000003854 Surface Print Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000003475 lamination Methods 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
- 238000012805 post-processing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- YKZUNWLMLRCVCW-UHFFFAOYSA-N 4-[2-(4-bicyclo[2.2.1]hept-2-enyl)ethyl]bicyclo[2.2.1]hept-2-ene Chemical compound C1CC(C2)C=CC21CCC1(C=C2)CC2CC1 YKZUNWLMLRCVCW-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 1
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000003079 width control 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/082—Layered products comprising a layer of metal comprising metal 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 comprising vinyl resins; comprising acrylic resins
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/085—Layered products comprising a layer of metal comprising metal 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 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
- B32B27/06—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
- B32B27/10—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 paper or cardboard
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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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
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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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
- C08J2433/12—Homopolymers or copolymers of methyl methacrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2493/00—Characterised by the use of natural resins; Derivatives thereof
- C08J2493/04—Rosin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of films, and particularly relates to a BOPE non-adhesive film, a preparation method thereof and a thermal composite sheet. The BOPE non-adhesive film comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer comprises 85-95wt% of ethylene-vinyl acetate copolymer and 5-15wt% of ethylene-norbornene copolymer; the functional layer surface layer comprises 90-98wt% of ethylene-vinyl acetate copolymer and 2-10wt% of capsules. The invention provides a novel BOPE non-adhesive film technical scheme, the BOPE non-adhesive film prepared by the technical scheme has the performance of direct paper-plastic thermal compounding, the interfacial binding force between the functional layer and the surface of a paper printing piece during the thermal compression compounding of a film is effectively improved, the film laminating fastness is effectively improved, the peeling strength of a thermal composite material is effectively improved, the subsequent deep embossing processing adaptability is further improved, the film production process is smooth, and the film is easier to roll up and roll down.
Description
Technical Field
The invention relates to the technical field of films, in particular to a BOPE non-adhesive film, a preparation method thereof and a thermal composite sheet.
Background
Biaxially oriented polyethylene film, abbreviated as BOPE film, is polyethylene obtained by stretching synchronously or asynchronously in the machine direction and in the transverse direction. Through stretching, the molecular chains and the platelets of the polyethylene are highly oriented along two directions, the optical performance and the mechanical performance of the film are greatly improved, and the BOPE film is easier to recycle than the BOPP film, so that the development of a PE single material composite structure packaging solution can be promoted, and the development of environmental protection and recycling economy is facilitated. In recent years, BOPE film is increasingly popular in the packaging industry due to its excellent combination of properties and unique environmental advantages.
Chinese patent CN102152580B discloses a polyethylene film for thermal compression compounding, which at least comprises a substrate layer and a thermal compression compounding layer, wherein the substrate layer is biaxially oriented film-grade polyethylene or ethylene-1-hexene copolymer, and the thermal compression compounding layer can directly realize thermal compression compounding with paper or pre-printed paper containing ink. However, the technology has the problem that the interface fastness of the hot-press compounding (hereinafter referred to as hot compounding) is insufficient when the polyethylene film is subjected to paper-plastic or plastic-plastic compounding, and is particularly applied to the field of digital printed matters containing silicone oil or wax, the digital printed matters are not easy to combine with a hot compounding layer during film coating, the hot-press compounding effect is affected, the combination fastness of the printed matters and the film after film coating is insufficient, and the deep embossing performance of the printed matters is poor.
Chinese patent CN106827750B discloses a polypropylene film containing an ethylene-vinyl acetate copolymer resin layer, wherein the polypropylene film is easier to degrade than the polyethylene film, but once the composite structure is separated and recovered, the recyclability is inferior to the latter, and the content of Vinyl Acetate (VA) in the ethylene-vinyl acetate copolymer (EVA) adopted in the technical scheme of the patent is low, which affects the interfacial bonding force between the non-adhesive film functional layer and the substrate when the film is processed and thermally compounded, but if the ethylene-vinyl acetate copolymer with a lower melting point is directly used for the thermal compression composite layer, there may be problems such as unsmooth unwinding during the manufacturing process, slitting process, storage and application, limiting the production speed, and serious problems even occurrence of film breakage under hot environment.
Disclosure of Invention
Based on the above, the invention aims to provide a novel BOPE non-adhesive film which has the performance of direct paper-plastic thermal compounding, effectively improves the interfacial bonding force between a film functional layer formed by a functional layer surface layer and the surface of a paper printing piece during thermal compounding, effectively improves the film laminating fastness, effectively improves the peeling strength of a thermal composite material, further improves the adaptability of subsequent deep embossing processing, and has smooth film production process and easy winding and unwinding, and comprises the steps of mother winding and slitting in the film manufacturing process, secondary slitting processing and film unwinding and laminating application.
A BOPE non-adhesive film comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer comprises 85-95wt% of ethylene-vinyl acetate copolymer (EVA) and 5-15wt% of ethylene-norbornene copolymer; the functional layer surface layer comprises 90-98wt% of ethylene-vinyl acetate copolymer (EVA) and 2-10wt% of capsules, wherein the particle size D50 of the capsules is 2-3 mu m; the capsule comprises an inner capsule layer and an outer capsule layer, wherein the inner capsule layer comprises hydrogenated rosin pentaerythritol ester with a softening point of 80-90 ℃ and silicon oxide, the particle size D50 of the silicon oxide is smaller than the particle size of 0.5 mu m of the capsule, the Mohs hardness of the silicon oxide is 6-7, and the outer capsule layer comprises ethylene-1-octene copolymer with a melting point of 115-120 ℃; the core layer comprises one or two of ethylene-1-hexene copolymer and ethylene-1-octene copolymer; the thickness of the functional layer surface layer is 0.5-1 mu m, and the thickness of the functional layer surface layer is 2-8 mu m.
Through a great deal of experimental verification and intensive research, the inventor performs differential function collaborative design on the ultrathin functional layer surface layer and the thicker functional layer surface layer, and the stiffness of the film functional layer surface layer is improved to a certain extent through the design of the ultrathin functional layer surface layer, so that the film is not easy to stick to a roller during production, and the smoothness of parent winding and unwinding in the film production process is ensured; by designing the thicker functional layer surface layer and utilizing the capsule principle, the film parent roll winding and unwinding smoothness is further ensured, the quality stability of the film in storage and transportation in different seasons is facilitated, the functional layer surface layer can be softened at the thermal compound processing temperature and pressure, the silica with specific size and specific hardness in the capsule inner layer can puncture the capsule outer layer, and the hydrogenated rosin pentaerythritol ester softened in the capsule inner layer is released to play a role of tackifying. Under the synergistic effect of the functional layer surface layer and the functional layer surface layer, the peeling strength after the subsequent thermal compounding with the base material is effectively improved, the subsequent deep embossing processing adaptability is further improved, the BOPE non-adhesive film production process is smooth, and the winding and unwinding are easier.
The BOPE non-adhesive film fully considers the thermal composite interface binding force between the film and the base materials such as printing ink or paper in the paper-plastic thermal composite application processing and the performance balance of the smoothness of the mother winding and unwinding in the film manufacturing process.
The functional layer surface layer comprises 85-95wt% of ethylene-vinyl acetate copolymer (EVA) and 5-15wt% of ethylene-norbornene copolymer. The ethylene-norbornene copolymer is formed by randomly arranging and copolymerizing norbornene monomers and ethylene monomers, is an amorphous copolymer, has a ring structure on a molecular chain, has certain rigidity, is added with a proper amount of ethylene-norbornene copolymer into the surface layer of the functional layer, plays a role of hardening in the surface layer of the functional layer in the production and manufacturing process, reduces the adhesive force between films, ensures that the surface layer of the functional layer of the BOPE non-adhesive film has relatively high stiffness, is beneficial to smooth production process of the film and smooth parent rolling and unreeling. In the surface layer of the functional layer, if the addition of the ethylene-norbornene copolymer is too low, the effect of improving unsmooth film parent roll-up and roll-down in the film production process is not obvious, and if the addition of the ethylene-norbornene copolymer exceeds 15%, the interfacial bonding force between the surface layer of the film functional layer of the paper-plastic thermal composite structure and the paper printing is low due to the fact that the concentration of EVA (ethylene-vinyl acetate) which is a main effective component of the surface layer of the functional layer is low.
The functional layer surface layer comprises 90-98wt% of ethylene-vinyl acetate copolymer and 2-10wt% of capsules, wherein the particle size D50 of the capsules is 2-3 mu m; the capsule comprises an inner capsule layer and an outer capsule layer, wherein the inner capsule layer comprises hydrogenated rosin pentaerythritol ester with a softening point of 80-90 ℃ and silicon oxide, the particle size D50 of the silicon oxide is smaller than the particle size of 0.5 mu m of the capsule, the Mohs hardness of the silicon oxide is 6-7, and the outer capsule layer comprises ethylene-1-octene copolymer with a melting point of 115-120 ℃. And a capsule with proper content is added into the functional layer surface layer, and a thermoplastic shell with relatively high melting point (namely the outer layer of the capsule) is beneficial to the smoothness of film production and parent rolling unreeling, and is also beneficial to the compatibility and affinity between the functional layer surface layer and the core layer to a certain extent. The ethylene-1-octene copolymer with the melting point of 115-120 ℃ is softened at the hot pressing temperature of 95-105 ℃, and meanwhile, under the hot pressing pressure of 10-20MPa, the silicon oxide with specific size and specific hardness in the inner layer of the capsule can puncture the softened outer layer of the capsule, so that the hydrogenated rosin pentaerythritol ester in the inner layer of the capsule is released, and the tackifying effect is achieved. Under the synergistic effect of the functional layer surface layer and the functional layer surface layer, the peeling strength of the hot-pressing composite is effectively improved, and the subsequent deep embossing processing adaptability is further improved. If the addition of the capsules is too low, the problem of unsmooth film parent roll winding and unwinding in the film production process is not facilitated to be improved, the compatibility and affinity between the functional layer surface layer and the core layer are also not facilitated to be ensured, so that interlayer shearing and peeling phenomena occur between films, if the addition of the capsules exceeds 10wt%, the risk of rupture of the capsules in the stretching process is increased, once the rupture occurs, the smoothness of the whole production process is not facilitated due to the mutual adhesion of the adhesive roll and the parent roll, and the uniformity of the thermal composite performance of the films is also not facilitated due to uneven dispersion of effective components.
The softening point of hydrogenated rosin pentaerythritol ester with tackifying effect is controlled at 80-90 ℃, so that the prepared BOPE non-adhesive film has optimal viscosity in hot-pressing compounding, if the softening point of the hydrogenated rosin pentaerythritol ester is lower than 80 ℃, the hydrogenated rosin pentaerythritol ester can be easier to soften and flow in production, the smoothness of production is not facilitated, if the softening point of the hydrogenated rosin pentaerythritol ester is higher than 90 ℃, the temperature difference between the inner layer and the outer layer of a capsule is smaller, the implementation effect of the capsule is not facilitated, the interface binding force with a base material in the subsequent hot compounding of a film is influenced, and the embossing deep processing adaptability of a hot compound sheet made of the film is further improved. In general, the melting point of the core layer of the BOPE non-adhesive film is 125-130 ℃, the melting point of the ethylene-1-octene copolymer of the outer layer of the capsule is controlled to be 115-120 ℃, on one hand, in the transverse stretching process, the outer layer of the capsule is not molten and keeps a relatively stiff state, which is equivalent to the formation of an EVA and capsule island structure in the functional layer surface layer, the stretching stress is insufficient to rupture the outer layer of the capsule, so that the hydrogenated rosin pentaerythritol ester of the inner layer of the capsule is wrapped and protected, the smoothness of film production is facilitated, and the parent rolling and unwinding are smooth, on the other hand, the capsule can rupture under the condition of a thermal compounding process, and the core layer is still stable, so that the thermal compounding is facilitated. If the melting point of the ethylene-1-octene copolymer at the outer layer of the capsule is too low, most of the capsule shell may be melted at the temperature of the transverse stretching process, the smoothness of the whole production process is not facilitated due to the mutual adhesion of the inner side and the outer side of the adhesive roll and the parent roll, the uniformity of the thermal compounding performance of the film is also not facilitated due to uneven dispersion of the effective components, if the melting point is too high, the capsule shell cannot be effectively softened under the hot-pressing compounding condition, so that the capsule shell cannot be pierced by silicon oxide with specific size and specific hardness, and hydrogenated rosin pentaerythritol ester cannot be released in time to play a role of tackifying, thereby being not beneficial to improving the thermal compounding interface binding force between the film and the base materials such as printing ink or paper. Under the conditions of the hot pressing temperature and the hot pressing pressure, the ethylene-1-octene copolymer in the outer layer of the capsule has certain elasticity, can elastically wrap the components in the inner layer of the capsule, controls the particle size D50 of the capsule to be 2-3 mu m, controls the particle size D50 of the silicon oxide to be smaller than the particle size 0.5 mu m of the capsule, and controls the Mohs hardness of the silicon oxide to be 6-7, so that the silicon oxide can puncture the outer layer of the capsule under the hot pressing effect, and the double functions of ensuring smooth winding and unwinding of the capsule in production and application and improving the interfacial binding force between the film and a base material during hot pressing composite post-processing are taken into account.
The thickness of the functional layer surface layer is 0.5-1 mu m, and the thickness of the functional layer surface layer is 2-8 mu m. Under the synergistic effect of the functional layer surface layer and the functional layer surface layer, the film functional layer formed by the functional layer surface layer and the functional layer surface layer has proper stiffness, the film is smooth to produce and process, meanwhile, the ultrathin melt of the functional layer surface layer can be timely supplemented in a penetrating and synergistic way from the thicker functional layer surface layer during hot-pressing lamination, the film and the paper printing are fully compounded, the bonding force of a thermal composite interface between the film and the paper printing is further improved, and the film laminating fastness and the peeling strength of the thermal composite sheet are ensured.
Further, in the surface layer of the functional layer, the melting point of the ethylene-vinyl acetate copolymer (EVA) is 78-85 ℃ and the melt index is 13-18g/10min. In the surface layer of the functional layer, the melting point of the ethylene-vinyl acetate copolymer (EVA) is 78-85 ℃, if the melting point of the ethylene-vinyl acetate copolymer (EVA) is lower than 78 ℃, the production stability is not facilitated, the roll sticking in the stretching traction or rolling process is easy to cause, the surface layer of the functional layer is locally degummed to influence the appearance quality of the film, and if the melting point of the ethylene-vinyl acetate copolymer (EVA) is higher than 85 ℃, the thermal compounding process efficiency is not facilitated, and meanwhile, the film shrinkage rate is increased to influence the effective size and even the film covering piece is warped. In limiting the surface layer of the functional layer, the melt index of the ethylene-vinyl acetate copolymer (EVA) is controlled to be 13-18g/10min, so that the melt fluidity is guaranteed to be good in the processing production process, the effective extrusion of the resin melt of the surface layer of the functional layer is facilitated, the resin melt is not too sticky, the production is smooth, and the processing applicability requirement can be met in the subsequent film thermal compounding process.
Further, the glass transition temperature of the ethylene-norbornene copolymer is 70-90 ℃, and the melt volume flow rate of the ethylene-norbornene copolymer is 10-20cm 3 And/10 min, wherein the content of norbornene monomer in the ethylene-norbornene copolymer is 62.5-67.5wt%. The glass transition temperature of the ethylene-norbornene copolymer is controlled to be 70-90 ℃, so that the smoothness of production is facilitated; the ethylene-norbornene copolymer with the melt volume flow rate range has relatively good melt flow matching property with the functional layer surface layer and the main component EVA of the functional layer surface layer, so that the thermal composite interface binding force between the film and the paper printing piece is ensured. Preferably, the ethylene-norbornene copolymer has a glass transition temperature of 78℃and a melt volume flow rate of 15cm 3 And/10 min. By defining the ethylene-norborneneThe content of norbornene in the copolymer ensures that the ethylene-norbornene copolymer has moderate steric hindrance, ensures proper melt fluidity, is favorable for subsequent stretching, ensures that the prepared film functional layer surface layer has proper stiffness, and greatly reduces the toughness of the functional layer surface layer if the steric hindrance macromolecular chain is too rigid, thereby being unfavorable for stretching film formation. Preferably, the content of norbornene monomer in the ethylene-norbornene copolymer is 65wt%.
Further, in the functional layer surface layer, the weight ratio of the inner capsule layer to the outer capsule layer in the capsule is 1:1, the content of the ethylene-1-octene copolymer in the functional layer surface layer is 1-5wt%, and the melt index of the ethylene-1-octene copolymer is 1-2 g/10min. The weight ratio of the inner layer of the capsule to the outer layer of the capsule in the capsule is controlled to be 1:1, and the content of the ethylene-1-octene copolymer in the surface layer of the functional layer is 1-5wt%, so that the inner layer of the capsule is effectively protected in the film production process, the outer layer of the capsule can be fully softened in the hot pressing compounding process, the hydrogenated rosin pentaerythritol ester in the inner layer of the capsule is released, and the bonding force of a thermal compounding interface between the film and a paper printing piece is ensured. If the content of the ethylene-1-octene copolymer exceeds 5wt%, the interfacial bonding force of the paper-plastic thermal composite structure is not improved due to the low concentration of EVA (ethylene-vinyl acetate) which is a main effective component of the functional layer surface layer, and if the content of the ethylene-1-octene copolymer is less than 1wt%, the problem that the film master batch is not smooth in winding and unwinding in the film production process is not solved, and the compatibility and affinity between the functional layer surface layer and the core layer are also not guaranteed, so that interlayer peeling between films is possibly caused. In the capsule, the melt index of the ethylene-1-octene copolymer is 1-2 g/10min, which is favorable for forming the sea-island structure of EVA and the capsule in the functional layer surface layer, and is more favorable for ensuring the stability of the functional layer surface layer in the extrusion process and the stretching process without rupture.
Further, the silicon oxide is solid silicon dioxide, the content of the solid silicon dioxide in the inner layer of the capsule is 1-2wt%, and the content of the hydrogenated rosin pentaerythritol ester in the inner layer of the capsule is 98-99wt%. And proper amount of applicable silicon oxide is added into the inner layer of the capsule, so that the outer layer of the capsule is pierced under the action of hot pressing, and the double functions of enabling the capsule to be smoothly rolled and unrolled in production and application and improving the interface binding force of the film and the base material in the process of thermal compounding and post-processing are taken into consideration. Preferably, the solid silica is present in the inner layer of the capsule in an amount of 2wt%.
Further, the content of the comonomer hexene or octene in the ethylene-1-hexene copolymer or ethylene-1-octene copolymer is 30-45mol% and the melt index is 1.7-2.5g/10min. If the content of hexene or octene in the ethylene-1-hexene copolymer or ethylene-1-octene copolymer is lower than 30mol%, the crystallinity of the copolymer is too high to meet the requirement of biaxial stretching in the preparation process of the BOPE non-adhesive film, so that uneven thickness and even film rupture occur in the stretching process; if the content of hexene or octene in the ethylene-1-hexene copolymer or ethylene-1-octene copolymer is more than 45mol%, the crystallinity of the copolymer is too low to be normally biaxially stretched and formed.
As one embodiment, the lower surface layer is a bright layer, the lower surface layer is a blend containing ethylene-1-hexene copolymer or ethylene-1-octene copolymer and an anti-blocking agent, the content of the anti-blocking agent in the lower surface layer is 500-2500ppm, and the anti-blocking agent is one or two of silicon dioxide and polymethyl methacrylate. The lower surface layer comprises the components, so that the anti-blocking effect of the BOPE non-adhesive film in the process of mother roll in the manufacturing process and the process of receiving and unreeling in the subsequent process is improved. The ethylene-1-hexene copolymer or ethylene-1-octene copolymer is the same as the core layer to ensure compatibility and affinity between the lower skin layer and the core layer.
As another embodiment, the lower surface layer is a matt layer, and the lower surface layer comprises one or two of 45-65wt% of ethylene-propylene copolymer, 35-55wt% of ethylene-1-hexene copolymer or ethylene-1-octene copolymer; in the extinction layer, the melt index of the ethylene-propylene copolymer is 0.5-1 g/10min, and the ethylene content of the ethylene-propylene copolymer is 2-5wt%; in the extinction layer, the melt index of the ethylene-1-hexene copolymer or the ethylene-1-octene copolymer is 10-20 g/10min, and the content of the comonomer hexene or octene is 6-10wt%. The components and the content of the lower surface layer are limited, the melt indexes of the ethylene-propylene copolymer and the ethylene-1-octene copolymer are in a specific range, so that the lower surface layer can generate a certain extinction effect, and the extinction uniformity is good.
The invention also provides a preparation method of the BOPE non-adhesive film, which comprises the following steps: the method comprises the steps of extruding core layer resin and lower surface layer resin through an extruder, co-extruding and processing the core layer resin and the lower surface layer resin into plasticized and homogenized melt, transmitting the melt through a pipeline, filtering the melt through a filter, co-extruding the melt through a runner distributor, quenching the melt into thick sheets through a casting sheet process, stretching the thick sheets into thin sheets through a longitudinal stretching process, converging the thin sheets through a co-extrusion laminating device consisting of the extruder, the die head and a guide roller, coating the two layers of functional layer surface layers on the surface of the thin sheet core layer after separating the thin sheets, enabling the functional layer surface layers to be one layer contacting the thin sheet core layer, stretching the thin sheets into thin films through a transverse stretching process, controlling the thickness of the thin films through an automatic thickness measuring device, trimming the thin films through an on-line trimming width, controlling the thin films through a corona treatment process or a flame treatment process, drawing and collecting the thin sheets into parent rolls through a winding process, and manufacturing thin film finished products through an aging treatment and slitting process. In the extrusion process of the functional layer surface layer, the control of extrusion equipment and the process ensures that the capsule cannot be broken in the extrusion coating process, wherein the extrusion temperature is controlled to be 95-100 ℃.
Further, in the longitudinal stretching process, the preheating temperature is controlled at 110-120 ℃, the stretching temperature is controlled at 90-100 ℃, and the shaping temperature after stretching is controlled at 90-100 ℃; in the transverse stretching process, the preheating temperature is controlled at 120-125 ℃, the stretching temperature is controlled at 105-110 ℃, and the shaping temperature after stretching is controlled at 108-112 ℃.
Further, when the transverse stretching is carried out, the chain clamping opening is ensured not to be contacted with the coated functional layer surface layer and the coated functional layer surface layer, and the chain clamping opening is prevented from being adhered to influence the smoothness of the stretching.
The invention also provides a thermal composite sheet, which comprises any one of the BOPE non-adhesive films and a substrate capable of being thermally compounded with the BOPE non-adhesive films, wherein the BOPE non-adhesive films are thermally compounded on the substrate. The thermal composite sheet is formed by the BOPE non-adhesive film and the base material through a hot-pressing film coating process, and has the advantages of high film coating fastness and high peeling strength. The substrate may be a sheet or sheet of paper (e.g., melamine paper, white cardboard, pre-cured and printed), film or sheet of a surface-printed plastic (e.g., calendered co-propylene, PVC, PETg), sheet metal, or the like.
The invention provides a novel BOPE film-free film, which has the performance of direct paper-plastic thermal compounding, and effectively improves the interfacial binding force between a film functional layer and the surface of a paper printing piece, which are formed by the functional layer surface layer and the functional layer surface layer during thermal compression compounding, through carrying out differential functional collaborative design on an ultrathin functional layer surface layer and a thicker functional layer surface layer, effectively improves the film laminating fastness, effectively improves the peeling strength of a thermal composite material, further improves the adaptability of subsequent deep embossing processing, and has the advantages of smooth film production process and easier winding and unwinding, including the processes of mother winding and slitting in the film manufacturing process, and also including secondary slitting processing and film unwinding application.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
The invention provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer comprises 85-95wt% of ethylene-vinyl acetate copolymer and 5-15wt% of ethylene-norbornene copolymer; the functional layer surface layer comprises 90-98wt% of ethylene-vinyl acetate copolymer and 2-10wt% of capsules, wherein the particle size D50 of the capsules is 2-3 mu m; the capsule comprises an inner capsule layer and an outer capsule layer, wherein the inner capsule layer comprises hydrogenated rosin pentaerythritol ester with a softening point of 80-90 ℃ and silicon oxide, the particle size D50 of the silicon oxide is smaller than the particle size of 0.5 mu m of the capsule, the Mohs hardness of the silicon oxide is 6-7, and the outer capsule layer comprises ethylene-1-octene copolymer with a melting point of 115-120 ℃; the core layer comprises one or two of ethylene-1-hexene copolymer and ethylene-1-octene copolymer; the thickness of the functional layer surface layer is 0.5-1 mu m, and the thickness of the functional layer surface layer is 2-8 mu m.
Further, in the surface layer of the functional layer, the melting point of the ethylene-vinyl acetate copolymer is 78-85 ℃ and the melt index is 13-18g/10min.
Further, the glass transition temperature of the ethylene-norbornene copolymer is 70-90 ℃, and the melt volume flow rate of the ethylene-norbornene copolymer is 10-20cm 3 And/10 min, wherein the content of norbornene monomer in the ethylene-norbornene copolymer is 62.5-67.5wt%.
Further, in the functional layer surface layer, the weight ratio of the inner capsule layer to the outer capsule layer in the capsule is 1:1, the content of the ethylene-1-octene copolymer in the functional layer surface layer is 1-5wt%, and the melt index of the ethylene-1-octene copolymer is 1-2 g/10min.
Further, the silicon oxide is solid silicon dioxide, the content of the solid silicon dioxide in the inner layer of the capsule is 1-2wt%, and the content of the hydrogenated rosin pentaerythritol ester in the inner layer of the capsule is 98-99wt%.
Further, the content of the comonomer hexene or octene in the ethylene-1-hexene copolymer or ethylene-1-octene copolymer is 30-45mol% and the melt index is 1.7-2.5g/10min.
As one embodiment, the lower surface layer is a bright layer, the lower surface layer is a blend containing ethylene-1-hexene copolymer or ethylene-1-octene copolymer and an anti-blocking agent, the content of the anti-blocking agent in the lower surface layer is 500-2500ppm, and the anti-blocking agent is one or two of silicon dioxide and polymethyl methacrylate.
As another embodiment, the lower surface layer is a matt layer, and the lower surface layer comprises one or two of 45-65wt% of ethylene-propylene copolymer, 35-55wt% of ethylene-1-hexene copolymer or ethylene-1-octene copolymer; in the extinction layer, the melt index of the ethylene-propylene copolymer is 0.5-1 g/10min, and the ethylene content of the ethylene-propylene copolymer is 2-5wt%; in the extinction layer, the melt index of the ethylene-1-hexene copolymer or the ethylene-1-octene copolymer is 10-20 g/10min, and the content of the comonomer hexene or octene is 6-10wt%.
Further, the thickness of the lower surface layer is 1-3 mu m, and the total thickness of the film is 15-30 mu m.
The invention also provides a preparation method of the BOPE non-adhesive film, which comprises the following steps: the method comprises the steps of extruding core layer resin and lower surface layer resin through an extruder, co-extruding and processing the core layer resin and the lower surface layer resin into plasticized and homogenized melt, transmitting the melt through a pipeline, filtering the melt through a filter, co-extruding the melt through a runner distributor, quenching the melt into thick sheets through a casting sheet process, stretching the thick sheets into thin sheets through a longitudinal stretching process, converging the thin sheets through a co-extrusion laminating device consisting of the extruder, the die head and a guide roller, coating the two layers of functional layer surface layers on the surface of the thin sheet core layer after separating the thin sheets, enabling the functional layer surface layers to be one layer contacting the thin sheet core layer, stretching the thin sheets into thin films through a transverse stretching process, controlling the thickness of the thin films through an automatic thickness measuring device, trimming the thin films through an on-line trimming width, controlling the thin films through a corona treatment process or a flame treatment process, drawing and collecting the thin sheets into parent rolls through a winding process, and manufacturing thin film finished products through an aging treatment and slitting process. It should be noted that during extrusion of the functional layer skin, control of the extrusion equipment and process ensures that the capsules do not rupture during extrusion coating.
Further, in the longitudinal stretching process, the preheating temperature is controlled at 110-120 ℃, the stretching temperature is controlled at 90-100 ℃, and the shaping temperature after stretching is controlled at 90-100 ℃; in the transverse stretching process, the preheating temperature is controlled at 120-125 ℃, the stretching temperature is controlled at 105-110 ℃, and the shaping temperature after stretching is controlled at 108-112 ℃.
Further, when the transverse stretching is carried out, the chain clamping opening is ensured not to be contacted with the coated functional layer surface layer and the coated functional layer surface layer, and the chain clamping opening is prevented from being adhered to influence the smoothness of the stretching.
The invention also provides a thermal composite sheet, which comprises any one of the BOPE non-adhesive films and a substrate capable of being thermally compounded with the BOPE non-adhesive films, wherein the BOPE non-adhesive films are thermally compounded on the substrate. The thermal composite sheet is formed by the BOPE non-adhesive film and the base material through a hot-pressing film coating process, and has the advantages of high film coating fastness and high peeling strength. The substrate may be a sheet or sheet of paper (e.g., melamine paper, white cardboard, pre-cured and printed), film or sheet of a surface-printed plastic (e.g., calendered co-propylene, PVC, PETg), sheet metal, or the like.
Physical properties of the following examples or comparative examples were measured as follows:
Film thickness was determined according to GB/T6672-2001;
melt index (melt mass flow rate MFR) according to GB/T3682-2018, ethylene-propylene copolymer according to 2.16kg at 230℃ethylene-vinyl acetate copolymer, ethylene-1-octene copolymer, ethylene-1-hexene copolymer according to 2.16kg at 190℃in g/10min;
melt volume flow Rate (MVR) of ethylene-norbornene copolymer measured at 2.16kg and 190℃in cm 3 /10min；
Melting point is measured according to GB/T16582-2008 in degrees Celsius;
glass transition temperature (Tg) measured according to ISO11357 in degrees celsius;
the peel strength of the white cardboard is measured according to GB/T8808 (A method) and the unit is N/15mm;
the method for testing the adhesion force between the films comprises the following steps: under the standard condition of a laboratory, obtaining a to-be-tested sample film with the thickness of 250mmx and 250mm, flatly wrapping the to-be-tested film with the thickness larger than the area between metal plates of a American BLOCKING FORCE ELECTROLIC TESTER tester, enabling the upper surface/lower surface plates of the film to be in contact, fully contacting and pressing the to-be-tested sample film with weights with the same area and the weight of 10kg, putting the to-be-tested sample film into a baking oven, curing at the temperature of 60 ℃ for 1 hour, gradually cooling for 5 minutes, slowly separating according to a specified speed, and testing a separation maximum force value with the unit of N.
The stated percentages by weight of the following examples or comparative examples are given in the following table:
example 1
The BOPE non-adhesive film of this embodiment includes a functional layer surface layer, a core layer, and a lower surface layer that are sequentially set.
The BOPE non-adhesive film of the embodiment and the preparation method thereof are as follows:
(1) Preparing a BOPE non-adhesive film raw material:
functional layer top layer: 85% by weight of an ethylene-vinyl acetate copolymer (melt index: 15 g/10min, melting point: 83 ℃ C.) and 15% by weight of an ethylene-norbornene copolymer (Tg: 78 ℃ C., MVR: 20 cm) were taken 3 And/10 min, norbornene monomer content of 65 wt%) as a functional layer surface layer resin.
Functional hierarchical surface layer: 98wt% of an ethylene-vinyl acetate copolymer (melt index: 15 g/10min, melting point: 83 ℃ C.) and 2 wt% of a capsule (capsule particle diameter: D50: 2 μm; in the capsule, the ethylene-1-octene copolymer accounts for 50wt%, the melting point of the ethylene-1-octene copolymer is 115 ℃ C., the melt index of the ethylene-1-octene copolymer is 1.5 g/10min; the pentaerythritol ester content of hydrogenated rosin having a softening point of 85 ℃ C., 49.5wt%, mohs hardness: 6, and solid silica content having a particle diameter: D50: 1.5 μm: 0.5 wt%) were uniformly mixed to obtain a functional layer resin.
Core layer: 100wt% of an ethylene-1-octene copolymer (wherein the 1-octene content was 30mol% and the melt index was 2.5g/10 min) was taken as the core resin.
The lower surface layer: 99.8% by weight of an ethylene-1-octene copolymer (wherein the 1-octene content is 30mol%, the melt index is 2.5g/10 min) and 2000ppm of silica having an average particle diameter D50 of 4 μm were uniformly mixed to obtain a lower surface layer resin.
(2) Preparing a BOPE non-adhesive film:
the method comprises the steps of feeding component raw materials of a core layer and a lower surface layer into a batching unit, metering the raw materials, feeding the raw materials into an extruder, controlling the extrusion temperature to be 210-240 ℃, converging the raw materials at a multi-layer die head after passing through a flow channel distributor to form a resin melt with a multi-layer structure, and cooling the resin melt by a chilled roll at 25-35 ℃ to form a resin sheet with a two-layer structure; introducing the resin sheet into a longitudinal stretching device in a biaxial stretching device, preheating at 110-120 ℃, controlling the stretching temperature to be 90-100 ℃, controlling the stretching ratio to be 4.5-5.5 times, and controlling the shaping temperature to be 90-100 ℃ after longitudinal stretching to form a sheet; the sheet is processed by a coextrusion film coating device consisting of an extruder, a die head and a guide roller, the two layers of the functional layer surface layer and the functional layer surface layer are coextruded and joined, the functional layer surface layer is coated on the surface of the sheet core layer after being separated from the die, the functional layer surface layer is one layer contacting the sheet core layer, a transverse stretching device is introduced, the preheating temperature is controlled to be 120-125 ℃, the transverse stretching temperature is controlled to be 105-110 ℃, the shaping temperature is controlled to be 108-112 ℃ after the transverse stretching, the stretching is 6-10 times, the thickness of the film is cooled by air shower, the thickness of the film is controlled by an automatic thickness measuring device, the width of the functional layer surface layer contained in the film before the online trimming process is controlled to be less than or equal to the width of a winding parent roll, and corona treatment is carried out on the surfaces of the functional layer surface layer and the lower surface layer after the online trimming process is carried out the trimming width control (the energy density of the corona treatment of the functional layer surface layer is 1.2 KJ/m) 2 The energy density of the corona treatment of the lower surface layer is 1.8 KJ/m 2 ) And drawing and coiling the film into a master roll through a coiling procedure, and preparing a film finished product from the master roll through an aging treatment and slitting procedure to obtain a BOPE film-free film with the total thickness of 30 mu m, wherein each layer of film which is combined adjacently in sequence is respectively: the thickness of the functional layer surface layer is 0.5 mu m, the thickness of the functional layer surface layer is 2.5 mu m, the thickness of the core layer is 25 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has smooth process.
Example 2
The embodiment provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the core layer and the lower surface layer are the same as in example 1, except that:
functional layer top layer: 95wt% ethylene-vinyl acetate copolymer (melt index 15 g/10min, VA content 15 w)t, melting point 83 ℃ C.) and 5wt% of an ethylene-norbornene copolymer (Tg 78 ℃ C., MVR 20 cm) 3 And/10 min, norbornene monomer content of 65 wt%) as a functional layer surface layer resin.
Functional hierarchical surface layer: 90wt% of an ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) and 10 wt% of a capsule (capsule particle diameter: D50: 3 μm; in the capsule, the ethylene-1-octene copolymer accounts for 50wt%, the melting point of the ethylene-1-octene copolymer: 115 ℃ C., melt index of the ethylene-1-octene copolymer: 1.5 g/10min; the pentaerythritol ester content of hydrogenated rosin having a softening point of 85 ℃ C., 49wt%, mohs hardness: 7, and solid silica content of 2.5 μm: 1 wt%) were uniformly mixed to obtain a functional layer surface resin.
The preparation method of the BOPE non-adhesive film of the embodiment is the same as that of the embodiment 1, the BOPE non-adhesive film is obtained, the total thickness of the film is 30 mu m, the thickness of the functional layer surface layer is 1 mu m, the thickness of the functional layer surface layer is 5 mu m, the thickness of the core layer is 22 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has smooth process and normal appearance.
Example 3
The embodiment provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the core layer was the same as in example 1, except that:
functional layer top layer: 90wt% of ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) and 10wt% of ethylene-norbornene copolymer (Tg: 78 ℃ C., MVR: 20 cm) were taken 3 And/10 min, norbornene monomer content of 65 wt%) as a functional layer surface layer resin.
Functional hierarchical surface layer: 94wt% of an ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) and 6 wt% of a capsule (capsule particle diameter: D50: 3 μm; in the capsule, the ethylene-1-octene copolymer accounts for 50wt%, the melting point of the ethylene-1-octene copolymer: 115 ℃ C., melt index of the ethylene-1-octene copolymer: 1.5 g/10min; the pentaerythritol ester content of hydrogenated rosin having a softening point of 85 ℃ C., 49wt%, mohs hardness: 7, and solid silica content of 2.5 μm: 1 wt%) were uniformly mixed to obtain a functional layer surface resin.
The lower surface layer: 50wt% of an ethylene-propylene copolymer (wherein the ethylene content was 5wt%, the melt index was 0.5g/10 min) and 50wt% of an ethylene-1-octene copolymer (wherein the 1-octene content was 6wt%, and the melt index was 10g/10 min) were uniformly mixed to obtain a lower surface layer resin.
The preparation method of the BOPE non-adhesive film of the embodiment is the same as that of the embodiment 1, the BOPE non-adhesive film is obtained, the total thickness of the film is 30 mu m, the thickness of the functional layer surface layer is 1 mu m, the thickness of the functional layer surface layer is 8 mu m, the thickness of the core layer is 19 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has smooth process.
Example 4
The embodiment provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer and the functional layer surface layer are the same as those of example 3, except that:
core layer: 100wt% of an ethylene-1-hexene copolymer (wherein the 1-hexene content was 30mol% and the melt index was 2.5g/10 min) was taken as a core layer resin.
The lower surface layer: 50wt% of an ethylene-propylene copolymer (wherein the ethylene content was 5wt%, the melt index was 0.5g/10 min) and 50wt% of an ethylene-1-hexene copolymer (wherein the 1-hexene content was 6wt%, and the melt index was 10g/10 min) were uniformly mixed to obtain a lower layer resin.
The preparation method of the BOPE non-adhesive film of this embodiment is the same as that of embodiment 1, and the obtained BOPE non-adhesive film has a total thickness of 30 mu m, wherein the thickness of the functional layer surface layer is 0.8 mu m, the thickness of the functional layer surface layer is 2 mu m, the thickness of the core layer is 25.2 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has smooth process.
Comparative example 1
The comparative example provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer and the core layer are the same as those of the embodiment 3, and the difference is that:
functional layer top layer: 100wt% of ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) was used as the functional layer surface layer resin.
The lower surface layer: 99.8% by weight of an ethylene-1-octene copolymer (wherein the 1-octene content is 30mol%, the melt index is 2.5g/10 min) and 2000ppm of silica having an average particle diameter D50 of 4 μm were uniformly mixed to obtain a lower surface layer resin.
The preparation method of the BOPE non-adhesive film of the comparative example is the same as that of the embodiment 1, the total thickness of the film is 30 mu m, the thickness of the surface layer of the functional layer is 1 mu m, the thickness of the surface layer of the functional layer is 5 mu m, the thickness of the core layer is 22 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has the defects of unsmooth technological process and difficult winding and unwinding.
Comparative example 2
The comparative example provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer, the core layer and the lower surface layer are the same as those of comparative example 1, and the difference is that:
functional layer top layer: 70wt% of ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) and 30wt% of ethylene-norbornene copolymer (Tg: 78 ℃ C., MVR: 20 cm) were taken 3 And/10 min, norbornene monomer content of 65 wt%) as a functional layer surface layer resin.
The preparation method of the BOPE non-adhesive film of the comparative example is the same as that of the embodiment 1, the total thickness of the film is 30 mu m, the thickness of the surface layer of the functional layer is 1 mu m, the thickness of the surface layer of the functional layer is 5 mu m, the thickness of the core layer is 22 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has smooth process.
Comparative example 3
The comparative example provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the core layer and the lower surface layer are the same as those of comparative example 1, and the difference is that:
functional layer top layer: 90wt% of ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) and 10wt% of ethylene-norbornene copolymer (Tg: 78 ℃ C., MVR: 20 cm) were taken 3 10min, norbornene monomer contentThe amount was 65 wt%) as a functional layer surface layer resin.
Functional hierarchical surface layer: 100wt% of ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) was taken as a functional gradation skin resin.
The preparation method of the BOPE non-adhesive film of the comparative example is the same as that of the embodiment 1, the total thickness of the film is 30 mu m, the thickness of the surface layer of the functional layer is 1 mu m, the thickness of the surface layer of the functional layer is 5 mu m, the thickness of the core layer is 22 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has smooth film making process, but the slitting, winding and unwinding are not smooth enough.
Comparative example 4
The comparative example provides a BOPE non-adhesive film, which comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer, the core layer and the lower surface layer are the same as those of comparative example 3, and the difference is that:
functional hierarchical surface layer: 80wt% of ethylene-vinyl acetate copolymer (melt index: 15 g/10min, VA content: 15wt%, melting point: 83 ℃ C.) and 20 wt% of capsule (capsule particle diameter: D50: 3 μm; in the capsule, the ethylene-1-octene copolymer accounts for 50wt%, the melting point of the ethylene-1-octene copolymer is 115 ℃ C., the melt index of the ethylene-1-octene copolymer is 1.5 g/10min; the pentaerythritol ester content of hydrogenated rosin having a softening point of 85 ℃ C. Is 49wt%, the Mohs hardness: 6, and the solid silica content having a particle diameter: D50: 2.5 μm: 1 wt%) were uniformly mixed to obtain a functional layer surface resin.
The preparation method of the BOPE non-adhesive film of the comparative example is the same as that of the embodiment 1, the total thickness of the film is 30 mu m, the thickness of the surface layer of the functional layer is 1 mu m, the thickness of the surface layer of the functional layer is 5 mu m, the thickness of the core layer is 22 mu m, and the thickness of the lower surface layer is 2 mu m. The preparation method has smooth film making process, but the slitting, winding and unwinding are not smooth enough.
Example 5
The embodiment provides a thermal composite sheet, which comprises a BOPE non-adhesive film and a surface printing co-propylene sheet, wherein the BOPE non-adhesive film is thermally compounded on the surface printing co-propylene sheet.
The thermal composite sheet of this example was prepared from BOPE non-adhesive film and a surface printing co-polypropylene sheet.
The BOPE non-adhesive film of the embodiment and the preparation method thereof are as follows:
(1) Preparing a polypropylene film:
one of the BOPE non-adhesive films was prepared as in examples 1-4 for use as the BOPE non-adhesive film.
(2) Preparing a sheet of the overprinting propylene copolymer:
selecting an ethylene-propylene copolymer containing gray pigment, wherein the melting point of the ethylene-propylene copolymer is 141 ℃ and the melt index is 6 g/10min, processing the ethylene-propylene copolymer into a calendered copolymer propylene sheet through a calendering process, carrying out surface corona treatment to 38 dyne/cm, coating a polyurethane coating with the surface of 20 mu m for printing until the total thickness is 170 mu m, printing the grain plate peach color with water-based ink, and taking the surface-printed copolymer propylene sheet as a surface-printed copolymer sheet for standby 24-72 hours after printing.
(3) Preparing the thermal composite sheet:
synchronously preheating the printed copolymerized propylene sheet to 95 ℃ by passing the hot-compounded surfaces (the functional layer surface layer and the functional layer surface layer) of the BOPE non-adhesive film through a Teflon-treated preheating roller, and synchronously introducing the hot-compounded surfaces and the pre-polymerized propylene sheet to a first hot-pressed compound large roller at 100 ℃ for 50 kgf/cm 2 And (5) hot-pressing and compounding by a press roller. When needed, preheating at 100-115 ℃ and entering an embossing group roller, oppositely pressing (extruding 50-100 mu m protruding thorns) in the pressure range, continuously cooling by a plurality of groups of metal rollers, and finally rolling to obtain the thermal composite sheet with the thickness of 190 mu m.
Example 6
The embodiment provides a thermal composite sheet, which comprises a BOPE non-adhesive film and a water-based ink pre-cured and printed melamine paper, wherein the BOPE non-adhesive film is thermally compounded on the water-based ink pre-cured and printed melamine paper.
The thermal composite sheet of this example was prepared from a BOPE non-adhesive film and a melamine paper pre-cured with water-based ink and printed.
The thickness of the thermal composite sheet prepared in this example is 150 μm, and the base material thermally compounded with the BOPE adhesive-free film is made of melamine paper preprinted with water-based ink, and the preparation method is the same as that of example 5, and the same equipment and process as described in example 5 are selected.
Example 7
In this example, the BOPE non-adhesive films prepared in examples 1 to 4 and comparative examples 1 to 4 were subjected to thermal compounding with white cardboard to obtain thermal composite sheets, respectively, and the peel strength of the white cardboard was measured.
As can be seen from the performance test data of comparative examples 1-4, the BOPE non-adhesive film prepared in comparative example 1 has the problems of unsmooth preparation process, unsmooth film winding and unwinding and the like due to the fact that the ethylene-norbornene copolymer is not added into the surface layer of the functional layer in comparative example 1, and the adhesive force between films is too large; in comparative example 2, although the preparation process is smooth, the interfacial bonding force between the thin film functional layer surface layer of the paper-plastic thermal composite structure and the white cardboard is low due to the fact that the concentration of EVA (ethylene-norbornene) which is a main effective component of the functional layer surface layer is low due to the fact that the addition amount of ethylene-norbornene copolymer in the functional layer surface layer is too large, so that the peeling strength is low; in comparative example 3, the EVA with 100% functional layer surface layer was smooth in film making process, but not smooth enough in slitting and unwinding; in comparative example 4, the risk of rupture of the capsule during the stretching process is increased due to excessive addition of the capsule in the functional layer surface layer, and once the capsule is ruptured, smoothness of the whole production process is not facilitated due to mutual adhesion of the inner side and the outer side of the adhesive roll and the parent roll, and uniformity of thermal compounding performance of the film is also not facilitated due to uneven dispersion of the effective components.
From the peeling strength and the bonding force data among the films, the novel BOPE non-adhesive film provided by the invention effectively improves the interfacial bonding force between the functional layer and the surface of the paper printing piece during the hot-pressing lamination of the films, has the advantages of high peeling strength and film-coating fastness, is smooth in production process, is easier to unwind and collect, is favorable for the stability of the films in the storage and transportation of hot environments, and can be applied to the field of silicone oil-containing or wax-containing digital printing products.
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 (10)
1. The BOPE non-adhesive film is characterized in that: comprises a functional layer surface layer, a core layer and a lower surface layer which are sequentially arranged; the functional layer surface layer comprises 85-95wt% of ethylene-vinyl acetate copolymer and 5-15wt% of ethylene-norbornene copolymer; the functional layer surface layer comprises 90-98wt% of ethylene-vinyl acetate copolymer and 2-10wt% of capsules, wherein the particle size D50 of the capsules is 2-3 mu m; the capsule comprises an inner capsule layer and an outer capsule layer, wherein the inner capsule layer comprises hydrogenated rosin pentaerythritol ester with a softening point of 80-90 ℃ and silicon oxide, the particle size D50 of the silicon oxide is smaller than the particle size of 0.5 mu m of the capsule, the Mohs hardness of the silicon oxide is 6-7, and the outer capsule layer comprises ethylene-1-octene copolymer with a melting point of 115-120 ℃; the core layer comprises one or two of ethylene-1-hexene copolymer and ethylene-1-octene copolymer; the thickness of the functional layer surface layer is 0.5-1 mu m, and the thickness of the functional layer surface layer is 2-8 mu m.
2. The BOPE adhesive-free film of claim 1, wherein: in the surface layer of the functional layer, the melting point of the ethylene-vinyl acetate copolymer is 78-85 ℃ and the melt index is 13-18g/10min.
3. The BOPE adhesive-free film of claim 1, wherein: the glass transition temperature of the ethylene-norbornene copolymer is 70-90 ℃, and the melt volume flow rate of the ethylene-norbornene copolymer is 10-20cm 3 And/10 min, wherein the content of norbornene monomer in the ethylene-norbornene copolymer is 62.5-67.5wt%.
4. The BOPE adhesive-free film of claim 1, wherein: the weight ratio of the inner capsule layer to the outer capsule layer in the capsule is 1:1, the content of the ethylene-1-octene copolymer in the functional layer surface layer is 1-5wt%, and the melt index of the ethylene-1-octene copolymer is 1-2 g/10min.
5. The BOPE adhesive-free film of claim 1, wherein: the silicon oxide is solid silicon dioxide, the content of the solid silicon dioxide in the inner layer of the capsule is 1-2wt%, and the content of the hydrogenated rosin pentaerythritol ester in the inner layer of the capsule is 98-99wt%.
6. The BOPE adhesive-free film of claim 1, wherein: in the core layer, the content of the comonomer hexene or octene in the ethylene-1-hexene copolymer or ethylene-1-octene copolymer is 30-45mol%, and the melt index is 1.7-2.5g/10min.
7. The BOPE adhesive-free film of claim 1, wherein: the lower surface layer is a bright layer, the lower surface layer is a blend containing ethylene-1-hexene copolymer or ethylene-1-octene copolymer and an anti-blocking agent, the content of the anti-blocking agent in the lower surface layer is 500-2500ppm, and the anti-blocking agent is one or two of silicon dioxide and polymethyl methacrylate.
8. The BOPE adhesive-free film of claim 1, wherein: the lower surface layer is a extinction layer and comprises one or two of 45-65wt% of ethylene-propylene copolymer, 35-55wt% of ethylene-1-hexene copolymer or ethylene-1-octene copolymer; in the extinction layer, the melt index of the ethylene-propylene copolymer is 0.5-1 g/10min, and the ethylene content of the ethylene-propylene copolymer is 2-5wt%; in the extinction layer, the melt index of the ethylene-1-hexene copolymer or the ethylene-1-octene copolymer is 10-20 g/10min, and the content of the comonomer hexene or octene is 6-10wt%.
9. A process for preparing a BOPE non-adhesive film according to any one of claims 1 to 8, wherein: the method comprises the following steps: the method comprises the steps of extruding core layer resin and lower surface layer resin through an extruder, co-extruding and processing the core layer resin and the lower surface layer resin into plasticized and homogenized melt, transmitting the melt through a pipeline, filtering the melt through a filter, co-extruding the melt through a runner distributor, quenching the melt into thick sheets through a casting sheet process, stretching the thick sheets into thin sheets through a longitudinal stretching process, converging the thin sheets through a co-extrusion laminating device consisting of the extruder, the die head and a guide roller, coating the two layers of functional layer surface layers on the surface of the thin sheet core layer after separating the thin sheets, enabling the functional layer surface layers to be one layer contacting the thin sheet core layer, stretching the thin sheets into thin films through a transverse stretching process, controlling the thickness of the thin films through an automatic thickness measuring device, trimming the thin films through an on-line trimming width, controlling the thin films through a corona treatment process or a flame treatment process, drawing and collecting the thin sheets into parent rolls through a winding process, and manufacturing thin film finished products through an aging treatment and slitting process.
10. A thermal composite sheet, characterized in that: a substrate comprising the BOPE adhesive-free film of any one of claims 1-8, thermally composited with the BOPE adhesive-free film, the BOPE adhesive-free film thermally composited on the substrate.
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| EP1000973A1 (en) * | 1998-11-16 | 2000-05-17 | Viskase Corporation | Puncture resistant, high shrink films, blends, and process |
| CN102152580A (en) * | 2009-12-31 | 2011-08-17 | 广东德冠薄膜新材料股份有限公司 | Polyethylene film for hot-pressing compositing |
| JP2019216144A (en) * | 2018-06-11 | 2019-12-19 | アルファゼロス株式会社 | Solar cell module |
| CN114694978A (en) * | 2020-12-29 | 2022-07-01 | 山东海科创新研究院有限公司 | Thermally-excited active safety mechanism flame-retardant microcapsule, preparation method thereof and supercapacitor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1000973A1 (en) * | 1998-11-16 | 2000-05-17 | Viskase Corporation | Puncture resistant, high shrink films, blends, and process |
| CN102152580A (en) * | 2009-12-31 | 2011-08-17 | 广东德冠薄膜新材料股份有限公司 | Polyethylene film for hot-pressing compositing |
| JP2019216144A (en) * | 2018-06-11 | 2019-12-19 | アルファゼロス株式会社 | Solar cell module |
| CN114694978A (en) * | 2020-12-29 | 2022-07-01 | 山东海科创新研究院有限公司 | Thermally-excited active safety mechanism flame-retardant microcapsule, preparation method thereof and supercapacitor |
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