CN110065281B - BOPP double-sided heat-sealing film and preparation method thereof - Google Patents
BOPP double-sided heat-sealing film and preparation method thereof Download PDFInfo
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- CN110065281B CN110065281B CN201910319194.4A CN201910319194A CN110065281B CN 110065281 B CN110065281 B CN 110065281B CN 201910319194 A CN201910319194 A CN 201910319194A CN 110065281 B CN110065281 B CN 110065281B
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- 239000011127 biaxially oriented polypropylene Substances 0.000 title claims abstract description 39
- 229920006378 biaxially oriented polypropylene Polymers 0.000 title claims abstract description 39
- 238000007789 sealing Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000010410 layer Substances 0.000 claims abstract description 82
- 229920005989 resin Polymers 0.000 claims abstract description 38
- 239000011347 resin Substances 0.000 claims abstract description 38
- 239000012792 core layer Substances 0.000 claims abstract description 30
- 239000004743 Polypropylene Substances 0.000 claims abstract description 28
- 229920001155 polypropylene Polymers 0.000 claims abstract description 25
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 claims abstract description 24
- -1 polypropylene Polymers 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000011342 resin composition Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 239000002216 antistatic agent Substances 0.000 claims description 25
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims description 12
- 239000003208 petroleum Substances 0.000 claims description 12
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 9
- 238000003851 corona treatment Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- 230000000181 anti-adherent effect Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 4
- 150000002148 esters Chemical class 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000003963 antioxidant agent Substances 0.000 claims description 2
- 239000011324 bead Substances 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 claims description 2
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 230000006750 UV protection Effects 0.000 claims 1
- 230000003078 antioxidant effect Effects 0.000 claims 1
- 239000011230 binding agent Substances 0.000 claims 1
- 239000003292 glue Substances 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 12
- 239000002904 solvent Substances 0.000 abstract description 5
- 231100000331 toxic Toxicity 0.000 abstract description 3
- 230000002588 toxic effect Effects 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 description 9
- 238000005299 abrasion Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 7
- 229920000058 polyacrylate Polymers 0.000 description 7
- 235000019504 cigarettes Nutrition 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000009998 heat setting Methods 0.000 description 3
- 239000012785 packaging film Substances 0.000 description 3
- 229920006280 packaging film Polymers 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000012748 slip agent Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003848 UV Light-Curing Methods 0.000 description 2
- 125000005396 acrylic acid ester group Chemical group 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000012536 packaging technology Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920005606 polypropylene copolymer Polymers 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009736 wetting 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
- B32B27/06—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
Abstract
A BOPP double-sided heat-sealing film comprises a core layer (1) and an outer layer (3), wherein a subsurface layer (2) is arranged between the core layer and the outer layer; wherein the material of the subsurface layer is polypropylene-based bonding resin, the material of the core layer is polypropylene composition, and the material of the outer layer is PETG resin composition. The BOPP double-sided heat-sealing film disclosed by the invention uses the BOPP film as a core layer and uses the PETG resin as a main material as an outer layer, so that the BOPP double-sided heat-sealing film has the advantages of wear resistance, low preparation process difficulty (good transverse and longitudinal film pulling performance during production). Furthermore, the invention solves the defect that the BOPP film and the PETG film are easy to slide and peel by adding the bonding layer (subsurface layer) which takes the polypropylene-based bonding resin as a material between the core layer and the outer layer, and the BOPP film and the PETG film can be prepared by the process of uniform extrusion and film drawing, and the process is simple and the production qualification rate is high. Compared with the bonding by using transparent glue, the process is simple and environment-friendly (the solvent of the transparent glue is generally toxic), and the peeling force and the heat seal strength are good.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a BOPP double-sided heat-sealing film and a preparation method thereof.
Background
Along with the improvement of the living standard of people and the enhancement of environmental awareness, the requirements on product packaging are higher and higher, the packaging technology is attractive, environmental protection is realized, the packaging technology is transparent enough for certain packaging fields such as carton packaging of cigarettes, the polishing is not easy, the aesthetic property is ensured, the carton packaging box can be removed, the environmental protection effect is realized, and the novel BOPP heat-sealing film meeting the requirements is required to be developed for the application fields of the requirements. At present, most BOPP heat-seal films have certain heat-seal performance by arranging the copolymerized PP as a surface layer, but because the surface hardness of the copolymerized PP is lower, the surface abrasion of the film is easy to cause in the packaging and transportation processes, scratches appear, the aesthetic property of the package is seriously affected, particularly in the field of cigarette packaging, and therefore, a plurality of BOPP production enterprises carry out the modification research on the aspects and have related patent disclosures:
chinese patent CN206264524U discloses a wear-resistant high-brightness smoke film comprising a 3-layer structure: the middle layer is a homo-polypropylene layer, and the upper and lower surfaces of the middle layer are co-polypropylene layers, wherein the co-polypropylene layers contain wear-resistant regular irregular sphere organic filler so as to increase wear resistance. Chinese patent CN106315009a discloses a smoke-resistant film which is of 3-layer structure: an intermediate core layer composed of homopolypropylene, an upper surface layer and a lower surface layer composed of copolymerized polypropylene, modified polyacrylate and a nucleating agent. The three-layer film is prepared by co-extrusion, wherein friction-resistant polyacrylate is mixed on the surface layer to increase the wear resistance of the surface layer.
Chinese patent CN103252960B discloses a wear resistant cigarette packaging film having a 3-layer structure: the transparent UV curing coating comprises a BOPP film layer in the middle layer, wherein polyacrylate layers are arranged on the upper surface and the lower surface of the middle layer, and a plurality of pits filled with the transparent UV curing coating are arranged on the polyacrylate layers, and the middle layer and the polyacrylate layers are bonded through transparent glue. The cigarette packaging film has the advantage that the friction resistance is improved mainly through the friction-resistant polyacrylate layer, however, the preparation process is that transparent glue is coated on the prepared intermediate layer film, polyacrylate solution is coated on the transparent glue after drying, and the transparent glue is dried and solidified again. The process is complex, the assembly line is long, the coated glue is easy to be uneven, air bubbles are easy to be generated by volatilizing the solvent (and cause workshop air pollution, exhaust air and air purifying equipment are required to be added to increase the cost), the rejection rate is high, and the friction resistance of the UV layer on the surface is insufficient, so that the friction resistance requirement of the cigarette packaging film cannot be fully met.
Chinese patent CN101362539B discloses a polyester film for shrink-wrapping cigarettes, which has a three-layer structure: the main component of the core layer formula is PETG+PET slices, the main component of the upper and lower surface layer formula is PETG, and the three-layer structure is compounded by direct coextrusion. The PETG film has good wear resistance, but the core layer is a film layer with PETG+PET slices as a main formula, and the film layer has poor stretchability during preparation, so that the process difficulty during production is high, and the water vapor permeation resistance is also insufficient.
Disclosure of Invention
The invention aims to provide a BOPP double-sided heat-sealing film which has the advantages of wear resistance, simple preparation process and difficult sliding and stripping of an outer layer and a core layer.
The invention further aims to provide a preparation method of the BOPP double-sided heat-sealing film, which is simple in preparation process and environment-friendly.
The invention is realized by the following technical scheme:
a BOPP double-sided heat-sealing film comprises a core layer and an outer layer, wherein a subsurface layer is arranged between the core layer and the outer layer; wherein the material of the core layer is polypropylene composition, the material of the subsurface layer is polypropylene-based bonding resin, and the material of the outer layer is PETG resin composition.
The core layer is made of BOPP film, and has good stretching performance (4X 8 times stretching), good water vapor blocking performance, and good wear resistance of the PETG resin composition as the outer layer, so that the BOPP double-sided heat-sealing film is prepared by compounding the two material films, and the BOPP double-sided heat-sealing film is wear-resistant, and can be produced by a preparation method of one-time coextrusion and transverse and longitudinal stretching, thereby reducing the production difficulty and improving the yield.
Further, as shown in fig. 1 of the specification, a sub-surface layer (2) is arranged between the core layer and the outer layer, and the material of the sub-surface layer is polypropylene-based bonding resin.
The adhesiveness between the core layer formed by the BOPP film and the outer layer film of the PETG resin composition is low, and the films are easy to slide and peel during use. Therefore, a sub-surface layer (bonding layer) composed of polypropylene-based bonding resin is further arranged between the outer layer and the core layer, and the bonding layer with the formula solves the problems of volatilization of toxic solvents (not environment-friendly) and air bubbles (low qualification rate) when transparent glue is used for production. In addition, as the polypropylene-based adhesive resin is used, the film can be produced by a preparation process of one-time coextrusion and transverse and longitudinal film drawing, so that the production efficiency is improved, and the production cost is reduced.
And moreover, compared with the bonding of a non-bonding layer and transparent glue, the polypropylene-based bonding resin improves the wear-resisting performance.
The polypropylene composition comprises, by weight, 70-100 parts of homo-polypropylene, 0-20 parts of petroleum resin, 0-5 parts of antistatic agent and 0-5 parts of slipping agent.
The polypropylene composition contains petroleum resin, and can improve the processing performance of the polypropylene composition, and the physical and mechanical properties and optical properties of the film.
The petroleum resin is selected from carbon five or carbon nine hydrogenated petroleum resins.
In the embodiment of the invention, the melt index of the homopolymerized polypropylene can be 2-4 g/10min, and GB/T3682.1-2018.
In the polypropylene composition, the antistatic agent is at least one selected from amine antistatic agents and ester antistatic agents; the slipping agent is at least one of erucamide slipping agents and oleamide slipping agents.
The polypropylene-based bonding resin is maleic anhydride grafted polypropylene bonding resin, the grafting rate is 0.1-2.0%, the melt index is 4-8 g/10min, and GB/T3682.1-2018.
The maleic anhydride grafted polypropylene binding resin can be pure maleic anhydride grafted polypropylene or a maleic anhydride grafted polypropylene composition, and other auxiliary agents such as slipping agents, antioxidants, ultraviolet resistant agents and the like can be included in the composition. The auxiliary agent can also be other additives. In the maleic anhydride grafted polypropylene composition, the maleic anhydride grafted polypropylene is the main component and accounts for more than 80 percent by weight.
The PETG resin composition comprises, by weight, 94-100 parts of PETG resin, 0-2 parts of antistatic agent, 0-2 parts of anti-adhesive agent and 0-2 parts of slipping agent.
In the PETG resin composition, the intrinsic viscosity of the PETG resin is 0.65-0.85dl/g; the antistatic agent is at least one selected from amine antistatic agents and ester antistatic agents; the slipping agent is at least one of silicone slipping agents and erucamide slipping agents; the anti-adhesive is at least one selected from silicon dioxide, clay, diatomite and glass beads.
The thickness of the core layer is 0.1-68.8 micrometers, the thickness of the subsurface layer is 0.3-3 micrometers, and the thickness of the outer layer is 0.3-3 micrometers. If the thickness of the subsurface layer is less than 0.3 microns, the adhesion will be less than 0.2N, which is not easy to meet the requirements of the film product.
The preparation method of the BOPP double-sided heat-seal film comprises the following steps: melting, plasticizing, extruding and converging the raw materials of each layer on the same die head by different extruders respectively, forming a thick sheet by a casting sheet roller from the melt flowing out of the die head, and carrying out longitudinal stretching, transverse stretching and traction treatment on the thick sheet, and then rolling to obtain the BOPP double-sided heat-sealing film; corona treatment is required after the traction treatment, if necessary.
And (3) a drying device: the temperature of the continuous drying device is 70 ℃ and the drying time is more than 6 hours.
Extruder device: the extruder can be a single-screw extruder or a double-screw extruder, the temperature of the extruder is set to be 170-290 ℃, the temperature is too low, the appearance effect of the film is poor due to poor resin plasticization, and even the melt is difficult to extrude; the temperature is too high, and the resin is easily decomposed, thereby affecting the product performance and even the production stability.
Cooling the cast sheet device: the cooling casting device can be formed by a casting roller and a cooling water tank together, or only the cooling casting roller, and the temperature setting range is 10-50 ℃. The melt from the die head is cooled into thick slices rapidly, the temperature setting of the cooling casting device has great influence on the quality of the thick slices, the quality of downstream production and even films can be influenced, and the temperature setting can be adjusted in the temperature range according to different conditions.
Longitudinal stretching device: the slabs pass through guide rollers into a longitudinal stretching zone, which generally comprises three parts, preheating, longitudinal stretching and heat setting. The preheating is to soften the thick sheet to meet the requirement of stretching (the temperature range is 100-150 ℃); the longitudinal stretching is realized by the preheated thick sheet through more than two stretching rollers with speed difference, the stretching multiplying power is set to 3.5-7.0, one-time stretching or two or more times stretching can be adopted, and the stretching temperature range is 60-130 ℃; the heat setting is to increase the dimensional stability of the film, and the temperature range is 90-155 ℃.
Transverse stretching device: the longitudinally stretched thick sheet is preheated, transversely stretched and heat-set in a transverse stretching area to form a film, and then enters a downstream traction and winding area. The preheating is to soften the thick sheet to meet the stretching requirement; the transverse stretching is to improve the transverse physical and mechanical properties of the film, the stretching multiplying power is set to be 8-12, and the specific stretching multiplying power is determined according to specific conditions; heat setting is to increase the dimensional stability of the film.
Corona treatment device: the corona treatment device is a part of a traction winding area, the corona treatment is mainly used for improving the wetting tension of the surface of the film, the downstream processing such as printing, compounding and the like is facilitated on the surface of the film, the magnitude of a corona treatment value can be determined according to the requirements of specific downstream clients, and some clients even do not need to carry out corona treatment on the film.
Traction winding device: and (3) after the processed BOPP film is pulled, rolling the BOPP film on a rolling device according to the production requirement.
Compared with the prior art, the invention has the following beneficial effects
Firstly, the BOPP double-sided heat-sealing film disclosed by the invention uses PETG as a main material to serve as an outer layer and BOPP as a core layer, so that the BOPP double-sided heat-sealing film disclosed by the invention has the advantages of abrasion resistance, low preparation process difficulty (good transverse and longitudinal film pulling performance in production and 4 multiplied by 8).
Furthermore, the polypropylene-based bonding resin is used for replacing the traditional transparent glue, the outer layer PETG resin and the core layer BOPP film are bonded, and the preparation method is simple and environment-friendly: the BOPP double-sided heat-sealing film can be obtained by transversely and longitudinally drawing films after being uniformly extruded and cast into thick sheets in a die head, and has high yield and no sliding and stripping of an outer layer and a core layer.
Compared with the use of transparent glue for bonding, although the peeling force of the transparent glue is slightly better, because the transparent glue contains a large amount of toxic solvents, a large amount of air exhaust and air filtering equipment is needed in the process of preparing the film, and bubbles possibly remain in the glue layer of the film along with the evaporation of the solvents, more importantly, the production process of the glue bonding film can only be that one layer of film is prepared first, then glue is coated and then the other layer of film is bonded, so that the preparation process is complex, the cost is high, and the rejection rate is also high. And moreover, compared with the bonding of a non-bonding layer and transparent glue, the polypropylene-based bonding resin improves the wear-resisting performance.
Therefore, the BOPP double-sided heat-sealing film has good competitiveness.
Detailed Description
The present invention is further illustrated by the following examples, but the present invention is not limited by the following examples.
The sources of the raw materials used in the invention are as follows:
PETG resin: islaman chemical GP001 in America;
maleic anhydride grafted polypropylene binding resin: ADMER of japan three-well chemistry TM Grafting ratio is 0.8%, melting point is 145 ℃;
homo-polypropylene: chinese petrochemical industry, division, F300M;
petroleum resin: exxon Mobil, PR100A;
antistatic agent: nanjing North, inc., SACY06, beijing Du Chen, DS126;
slip agent: SJ065, a plastic masterbatch Co., ltd., 2582SC, a Shulman plastics Co., ltd;
anti-adhesive: the method comprises the steps of carrying out a first treatment on the surface of the Shulman plastics company ABPP05SC;
examples BOPP double-sided heat-sealable films were prepared by the process described in the description.
The performance testing method comprises the following steps:
(1) Heat seal strength: with reference to GBT1003-2008 detection (heat seal strength means that two films are mutually fused and cooled for a certain time under temperature and pressure and have certain tightness, and the heat seal strength is mainly applied to the field of sealed packaging);
(2) Peel force: detection is carried out by referring to GB 8808-88;
(3) Wear-resisting spending time: rubbing 20 films within a set time to observe whether the films are scratched, if so, the time is the wear-resistant time;
(4) Coefficient of friction: reference is made to GB10006-88 detection.
Table 1: examples BOPP double-sided Heat seal film formulation (weight percent of each layer) and results of each Performance test
Comparative example 1: the film has only 3 layers: the outer layer (PETG 95%, antistatic agent 2%, slip agent 1%, anti-blocking agent 2%) had a thickness of 0.3 μm, the core layer (homo-polypropylene 82%, petroleum resin 15%, slip agent 1%, antistatic agent 2%) had a thickness of 20 μm, and the preparation process was the same as in the examples except that no subsurface layer was prepared. The test results are: the heat sealing strength is 1.9N/15mm, the peeling force is less than 0.1N, the abrasion resistance time is less than 20s, and the friction coefficient is 0.19.
Comparative example 2: the film contains 5 layers: the thickness of the outer layer (PETG 95%, antistatic agent 2%, slipping agent 1%, anti-sticking agent 2%) is 0.3 micrometers, the thickness of the core layer (homo-polypropylene 82%, petroleum resin 15%, slipping agent 1%, antistatic agent 2%) is 20 micrometers, the subsurface layer is bonded by using transparent glue, the transparent glue is acrylic acid ester solution, the preparation process is that the acrylic acid ester solution is coated on line on the core layer formed by planar biaxial stretching film, and then the outer layer is compounded. The test results are: the heat seal strength was 2.0N/15 mm, the peeling force was 1.1N, the abrasion resistance took 23 seconds and the friction coefficient was 0.18.
Comparative example 3: the film contains 3 layers: the thickness of the outer layer (95% of the polypropylene copolymer, 2% of the antistatic agent, 1% of the slipping agent and 2% of the anti-adhesion agent) is 1.2 microns, and the thickness of the core layer (82% of the polypropylene homopolymer, 15% of the petroleum resin, 1% of the slipping agent and 2% of the antistatic agent) is 18 microns. The test results are: the heat seal strength is 3.4N/15 mm, the temperature is 135 ℃, the abrasion resistance time is less than 20 seconds, and the friction coefficient is 0.19.
Comparative example 4: the film contains 3 layers: the thickness of the outer layer (95% of the polypropylene copolymer, 2% of the antistatic agent, 1% of the slipping agent and 2% of the glass microsphere wear-resistant agent) is 1.2 microns, the thickness of the core layer (82% of the polypropylene homopolymer, 15% of the petroleum resin, 1% of the slipping agent and 2% of the antistatic agent) is 18 microns, and the preparation process is a three-layer melt coextrusion planar biaxial stretching method. The test results are: the heat seal strength is 3.3N/15 mm, the temperature is 135 ℃, the abrasion resistance takes 24 seconds, and the friction coefficient is 0.17.
The BOPP double-layer heat-sealing film has good use value only by reaching at least 0.2N of peeling force.
As can be seen from Table 1, the BOPP double-layer heat-sealing film of the invention has simple preparation process and good product performance, and the wear-resisting time of comparative examples 1 and 2 shows that the use of polypropylene-based bonding resin improves the wear-resisting performance compared with the bonding without a bonding layer and the bonding with transparent glue. .
As can be seen from comparative example 2, although the subsurface layer is transparent and has good peeling force compared with water, the production process is complicated, the environment is not protected, and the product competitiveness is insufficient.
As can be seen from comparative examples 3 and 4, if the skin layer is made of PP material, although the adhesion effect with the core layer is good and the peeling force is high, the method can also be produced by using the three-layer melt coextrusion planar biaxial stretching method, but the abrasion resistance is poor.
Claims (6)
1. The BOPP double-sided heat-sealing film is characterized by comprising a core layer (1) and an outer layer (3), wherein a subsurface layer (2) is arranged between the core layer and the outer layer; wherein the material of the subsurface layer is polypropylene-based bonding resin, the material of the core layer is polypropylene composition, and the material of the outer layer is PETG resin composition; the thickness of the core layer is 0.1-68.8 micrometers, the thickness of the subsurface layer is 0.3-3 micrometers, and the thickness of the outer layer is 0.3-3 micrometers; the polypropylene composition comprises, by weight, 70-100 parts of homo-polypropylene, 0-20 parts of petroleum resin, 0-5 parts of antistatic agent and 0-5 parts of slipping agent; the polypropylene-based bonding resin is selected from maleic anhydride grafted polypropylene bonding resin, the grafting rate is 0.1-2%, the melt index is 4-8 g/10min, and GB/T3682.1-2018.
2. The BOPP double-sided heat-seal film of claim 1, wherein the antistatic agent is at least one selected from the group consisting of amine antistatic agents and ester antistatic agents; the slipping agent is at least one of erucamide slipping agents and oleamide slipping agents; the petroleum resin is selected from hydrogenated petroleum resin of carbon five or carbon nine.
3. The BOPP double-sided heat-seal film of claim 1, wherein the maleic anhydride grafted polypropylene binder resin is pure maleic anhydride grafted polypropylene or a maleic anhydride grafted polypropylene composition, wherein the maleic anhydride grafted polypropylene composition comprises other additives, and the other additives comprise one or more of a slipping agent, an antioxidant and an ultraviolet resistance agent.
4. The BOPP double-sided heat-seal film of claim 1, wherein the PETG resin composition comprises 94-100 parts by weight of PETG resin, 0-2 parts by weight of antistatic agent, 0-2 parts by weight of anti-adhesive, and 0-2 parts by weight of slipping agent.
5. The BOPP double-sided heat-seal film of claim 4, wherein the PETG resin has an intrinsic viscosity of 0.65-0.85dl/g; the antistatic agent is at least one selected from amine antistatic agents and ester antistatic agents; the slipping agent is at least one of silicone slipping agents and erucamide slipping agents; the anti-adhesive is at least one selected from silicon dioxide, clay, diatomite and glass beads.
6. The preparation method of the BOPP double-sided heat-sealing film according to any one of claims 1 to 5, which is characterized by comprising the following steps of respectively melting, plasticizing and extruding all the raw materials by different extruders to form a thick sheet by a casting roller, and winding the thick sheet after longitudinal stretching, transverse stretching and traction treatment; corona treatment is required after the traction treatment, if necessary.
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| CN110815781A (en) * | 2019-11-20 | 2020-02-21 | 江苏光辉包装材料有限公司 | Preparation method of five-layer co-extruded flexible heat-shrinkable label film |
| CN112848580B (en) * | 2021-02-04 | 2023-06-23 | 河南银金达新材料股份有限公司 | PETG/PET co-extrusion self-sealing multilayer film and preparation method thereof |
| CN113024951A (en) * | 2021-03-15 | 2021-06-25 | 瑞安市东威塑胶有限公司 | BOPP film with low wearing and tearing |
| CN114474932A (en) * | 2022-02-07 | 2022-05-13 | 山东优尼科斯科技股份有限公司 | Method and device for preparing polyolefin bottom-back spliced carpet |
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Inventor after: Xue Peng Inventor after: He Qingdong Inventor before: Xue Peng |