CN111703160A - Antibacterial barrier BOPET film and preparation method thereof - Google Patents

Antibacterial barrier BOPET film and preparation method thereof Download PDF

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Publication number
CN111703160A
CN111703160A CN202010376031.2A CN202010376031A CN111703160A CN 111703160 A CN111703160 A CN 111703160A CN 202010376031 A CN202010376031 A CN 202010376031A CN 111703160 A CN111703160 A CN 111703160A
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bopet film
surface layer
antibacterial
barrier
stretching
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张少伟
王红兵
张涛
黄剑
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Anhui Guofeng Plastic Industry Co Ltd
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Anhui Guofeng Plastic Industry Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
    • 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
    • B32B27/36—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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
    • 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
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • 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
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/041—Carbon nanotubes
    • 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
    • C08K3/346—Clay
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/16—Solid spheres
    • C08K7/18—Solid spheres inorganic
    • C08K7/20—Glass
    • 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
    • C08K9/12—Adsorbed ingredients, e.g. ingredients on carriers

Abstract

The invention discloses an antibacterial barrier BOPET film and a preparation method thereof, relating to the technical field of BOPET films, wherein the BOPET film consists of an upper surface layer, a core layer and a lower surface layer; the upper surface layer and the lower surface layer are antibacterial layers and are prepared from the following raw materials: silver-loaded carbon nanotubes, glass beads and polyester chips; the core layer is a barrier layer and is prepared from the following raw materials: EVOH, nano montmorillonite and polyester chip. According to the invention, through optimization of the formula and adjustment of process parameters, the prepared BOPET film has excellent antibacterial and barrier properties on the basis of ensuring good physical and mechanical properties and optical properties, the antibacterial rate reaches 99%, the oxygen diffusion coefficient is only 1/3 of that of the common BOPET film, and the BOPET film can be widely applied to the fields of food packaging and other industrial packaging.

Description

Antibacterial barrier BOPET film and preparation method thereof
Technical Field
The invention relates to the technical field of BOPET films, in particular to an antibacterial barrier BOPET film and a preparation method thereof.
Background
The BOPET film is widely applied to the field of packaging due to good performance, and has the characteristics of high strength, good rigidity, transparency, high glossiness, good toughness and the like. At present, the domestic BOPET antibacterial or barrier film is mainly produced by a coating mode, namely, a functional coating liquid is coated on the surface of the film, and the method has the problems of environmental pollution, low production efficiency and the like. A few manufacturers also produce PET antibacterial films or barrier films in an internal mixing mode, but the haze of the films is large and the optical performance is poor due to the problems of raw material formulas and production processes.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an antibacterial barrier BOPET film and a preparation method thereof, and the BOPET film with excellent antibacterial property, barrier property and optical and mechanical properties is prepared by optimizing a formula and adjusting process parameters.
The invention provides an antibacterial barrier BOPET film, which consists of an upper surface layer, a core layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are antibacterial layers and are prepared from the following raw materials: silver-loaded carbon nanotubes, glass beads and polyester chips; the core layer is a barrier layer and is prepared from the following raw materials: EVOH, nano montmorillonite and polyester chip.
Preferably, the antibacterial layer is prepared from the following raw materials in percentage by weight: 1.0-1.2% of silver-loaded carbon nano tube, 0.3-0.4% of glass bead and the balance of polyester chip;
the core layer is prepared from the following raw materials in parts by weight: 10-15% of EVOH, 0.5-0.8% of nano montmorillonite and the balance of polyester chips.
Preferably, the silver-loaded carbon nanotubes are prepared by using multi-walled carbon nanotubes and a silver nitrate solution.
Preferably, the average particle size of the glass beads is 1.5-2 μm.
Preferably, the thickness of the upper surface layer and the thickness of the lower surface layer respectively account for 12-14% of the total thickness of the film.
The invention also provides a preparation method of the antibacterial barrier BOPET film, which comprises the following steps:
s1, uniformly mixing EVOH, nano-montmorillonite and polyester chips, extruding the mixture by a double-screw extruder, drying the mixture, adding the dried mixture into a main extruder, melting and filtering the mixture to prepare a core layer melt; uniformly mixing the silver-loaded carbon nano tube, the glass beads and the polyester slices, extruding and drying the mixture by a double-screw extruder, respectively adding the mixture into two auxiliary extruders, and melting and vacuumizing the mixture to prepare upper and lower surface layer melts; co-extruding the core layer melt and the upper and lower surface layer melts by adopting a three-layer structure die head to prepare a membrane;
s2, attaching the film-forming sheet to a chill roll and cooling to obtain a cast sheet;
s3, longitudinally stretching the cast sheet into a thick sheet, and transversely stretching the thick sheet to obtain a BOPET film;
and S4, air cooling, drawing, rolling, slitting and packaging the BOPET film to obtain the finished product.
Preferably, in S1, the main extruder is a single-screw extruder, and the extrusion temperature is 265-270 ℃; preferably, the auxiliary extruder is a double-screw extruder, and the extrusion temperature is 270-275 ℃; preferably, the extrusion temperature of the three-layer co-extrusion is 270-272 ℃.
Preferably, in S1, mixing the raw materials of the core layer, extruding the mixture by a double-screw extruder, and drying the mixture by a fluidized bed at the drying temperature of 140-150 ℃ for 4-5 h; preferably, the filtration is performed using a 15 μm disc filter.
Preferably, in S2, the cooling temperature of the cast slab is 20 to 25 ℃.
Preferably, in S3, the preheating temperature in longitudinal stretching is 60-95 ℃, the stretching temperature is 100-110 ℃, and the stretching ratio is 3.5-4.0 times; preferably, the preheating temperature in transverse stretching is 90-100 ℃, the stretching temperature is 100-120 ℃, the stretching magnification is 3.5-4.0 times, and the setting temperature is 200-230 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the additive amount of the silver-loaded carbon nano tube in the BOPET film is small, the optical performance of the film is not influenced, the antibacterial effect is excellent, the antibacterial rate reaches more than 99%, and the antibacterial effective time is long and can reach more than 2 years.
The small-particle-size glass microspheres adopted in the BOPET film play a role in film opening, so that on one hand, the BOPET film is ensured to be normally wound and unwound, on the other hand, the haze of the film is reduced, and the optical performance of the film is improved.
3. The core layer is made of EVOH and nanoscale montmorillonite blended with polyester chips, the barrier performance of the film is remarkably improved, the oxygen permeability coefficient is reduced from 2.0 × 10-15cm3 × cm/(cm2 × S × Pa) to 0.7 × 10-15cm3 × cm/(cm2 × S × Pa), and the water vapor permeability coefficient is reduced from 4.0g 0.1mm/(m2 × 24h) to 2.5g 0.1mm/(m2 × 24 h).
In conclusion, the BOPET film disclosed by the invention has excellent antibacterial and barrier properties on the basis of ensuring good physical and mechanical properties and optical properties, and has wide market prospects in the fields of fresh food packaging and other industrial packaging.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
An antibacterial barrier BOPET film comprises an upper surface layer, a core layer and a lower surface layer; the thickness of the film is 15 μm, and the thickness of the upper and lower surface layers respectively accounts for 12% of the total thickness of the film.
The upper surface layer and the lower surface layer are antibacterial layers and are prepared from the following raw materials in percentage by weight: 1.0% of silver-loaded carbon nano tube, 0.3% of glass bead and the balance of polyester chip; wherein the average particle diameter of the glass beads is 1.5 μm.
The core layer is a barrier layer and is prepared from the following raw materials in parts by weight: 10 percent of EVOH, 0.8 percent of nano montmorillonite and the balance of polyester chips.
The invention also provides a preparation method of the antibacterial barrier BOPET film, which comprises the following steps:
s1, uniformly mixing EVOH, nano-montmorillonite and polyester chips, extruding the mixture by a double-screw extruder, drying the mixture for 5 hours at the temperature of 140 ℃ by adopting a fluidized bed, adding the dried mixture into a single-screw extruder for melting, wherein the extrusion temperature is 265 ℃, and filtering the mixture by using a 15-micrometer disc type filter to prepare a core layer melt; uniformly mixing the silver-loaded carbon nano tube, the glass beads and the polyester slices, extruding and drying the mixture by using a double-screw extruder, respectively adding the mixture into two double-screw extruders, wherein the extrusion temperature is 270 ℃, and then melting and vacuumizing the mixture to prepare upper and lower surface layer melts; co-extruding the core layer melt, the upper surface layer melt and the lower surface layer melt by adopting a three-layer structure die head to prepare a membrane, wherein the extrusion temperature is 270 ℃;
s2, attaching the film-forming sheet to a chill roll with the temperature of 20 ℃ and cooling to obtain a cast sheet;
s3, longitudinally stretching the cast sheet into a thick sheet, wherein the longitudinal stretching preheating temperature is 60 ℃, the stretching temperature is 100 ℃, and the stretching magnification is 3.5 times; transversely stretching the thick sheet to obtain a BOPET film, wherein the transverse line stretching preheating temperature is 90 ℃, the stretching temperature is 100 ℃, the stretching magnification is 3.5 times, and the setting temperature is 200 ℃;
and S4, air cooling, drawing, rolling, slitting and packaging the BOPET film to obtain the finished product.
Example 2
An antibacterial barrier BOPET film comprises an upper surface layer, a core layer and a lower surface layer; the thickness of the film is 18 μm, and the thickness of the upper and lower surface layers respectively accounts for 13% of the total thickness of the film.
The upper surface layer and the lower surface layer are antibacterial layers and are prepared from the following raw materials in percentage by weight: 1.1% of silver-loaded carbon nano tube, 0.35% of glass bead and the balance of polyester chip; wherein the average particle diameter of the glass beads is 1.8 μm.
The core layer is a barrier layer and is prepared from the following raw materials in parts by weight: 12 percent of EVOH, 0.6 percent of nano montmorillonite and the balance of polyester chips.
The invention also provides a preparation method of the antibacterial barrier BOPET film, which comprises the following steps:
s1, uniformly mixing EVOH, nano-montmorillonite and polyester chips, extruding the mixture by a double-screw extruder, drying the mixture for 4.5 hours at the temperature of 145 ℃ by adopting a fluidized bed, adding the dried mixture into a single-screw extruder for melting, wherein the extrusion temperature is 268 ℃, and filtering the mixture by using a 15-micrometer disc type filter to prepare a core layer melt; uniformly mixing the silver-loaded carbon nano tube, the glass beads and the polyester slices, extruding and drying the mixture by using a double-screw extruder, respectively adding the mixture into two double-screw extruders, wherein the extrusion temperature is 273 ℃, and then melting and vacuumizing the mixture to prepare upper and lower surface layer melts; co-extruding the core layer melt and the upper and lower surface layer melts by adopting a three-layer structure die head to prepare a membrane, wherein the extrusion temperature is 271 ℃;
s2, attaching the film-forming sheet to a chill roll with the temperature of 25 ℃ and cooling to obtain a cast sheet;
s3, longitudinally stretching the cast sheet into a thick sheet, wherein the longitudinal stretching preheating temperature is 80 ℃, the stretching temperature is 105 ℃, and the stretching magnification is 3.8 times; transversely stretching the thick sheet to obtain a BOPET film, wherein the transverse line stretching preheating temperature is 95 ℃, the stretching temperature is 110 ℃, the stretching ratio is 3.8 times, and the setting temperature is 215 ℃;
and S4, air cooling, drawing, rolling, slitting and packaging the BOPET film to obtain the finished product.
Example 3
An antibacterial barrier BOPET film comprises an upper surface layer, a core layer and a lower surface layer; the thickness of the film is 20 μm, and the thickness of the upper and lower surface layers respectively accounts for 14% of the total thickness of the film.
The upper surface layer and the lower surface layer are antibacterial layers and are prepared from the following raw materials in percentage by weight: 1.2 percent of silver-loaded carbon nano tube, 0.4 percent of glass bead and the balance of polyester chip; wherein the average particle diameter of the glass beads is 2 μm.
The core layer is a barrier layer and is prepared from the following raw materials in parts by weight: 15 percent of EVOH, 0.5 percent of nano montmorillonite and the balance of polyester chips.
The invention also provides a preparation method of the antibacterial barrier BOPET film, which comprises the following steps:
s1, uniformly mixing EVOH, nano-montmorillonite and polyester chips, extruding the mixture by a double-screw extruder, drying the mixture for 4 hours at the temperature of 150 ℃ by adopting a fluidized bed, adding the dried mixture into a single-screw extruder for melting, wherein the extrusion temperature is 270 ℃, and filtering the mixture by using a 15-micrometer disc type filter to prepare a core layer melt; uniformly mixing the silver-loaded carbon nanotube, the glass beads and the polyester slices, extruding and drying the mixture by using a double-screw extruder, respectively adding the mixture into two double-screw extruders, wherein the extrusion temperature is 275 ℃, and then melting and vacuumizing the mixture to prepare upper and lower surface layer melts; co-extruding the core layer melt and the upper and lower surface layer melts by adopting a three-layer structure die head to prepare a membrane, wherein the extrusion temperature is 272 ℃;
s2, attaching the film-forming sheet to a chill roll with the temperature of 25 ℃ and cooling to obtain a cast sheet;
s3, longitudinally stretching the cast sheet into a thick sheet, wherein the longitudinal stretching preheating temperature is 95 ℃, the stretching temperature is 110 ℃, and the stretching magnification is 4.0 times; transversely stretching the thick sheet to obtain a BOPET film, wherein the transverse line stretching preheating temperature is 100 ℃, the stretching temperature is 120 ℃, the stretching magnification is 4.0 times, and the setting temperature is 230 ℃;
and S4, air cooling, drawing, rolling, slitting and packaging the BOPET film to obtain the finished product.
Comparative example 1
A BOPET film consists of an upper surface layer, a core layer and a lower surface layer; the thickness of the film is 15 μm, and the thickness of the upper and lower surface layers respectively accounts for 12% of the total thickness of the film.
The upper and lower surface layers are anti-sticking layers and are prepared from the following raw materials in percentage by weight: 0.4% of silicon dioxide and 99.6% of polyester chips; wherein the average particle diameter of the silica is 2.5. mu.m.
The core layer is prepared from the following raw materials in percentage by weight: 100% of polyester chips.
The preparation method comprises the following steps:
s1, drying the polyester chips for 5 hours at the temperature of 140 ℃ in a fluidized bed, adding the dried polyester chips into a single-screw extruder for melting, wherein the extrusion temperature is 265 ℃, and filtering the polyester chips by a 15-micrometer disc type filter to prepare a core layer melt; uniformly mixing silicon dioxide and polyester slices, extruding and drying the silicon dioxide and polyester slices by using a double-screw extruder, respectively adding the silicon dioxide and polyester slices into two double-screw extruders, wherein the extrusion temperature is 270 ℃, and then melting and vacuumizing the silicon dioxide and polyester slices to prepare upper and lower surface layer melts; co-extruding the core layer melt, the upper surface layer melt and the lower surface layer melt by adopting a three-layer structure die head to prepare a membrane, wherein the extrusion temperature is 270 ℃;
s2, attaching the film-forming sheet to a chill roll with the temperature of 20 ℃ and cooling to obtain a cast sheet;
s3, longitudinally stretching the cast sheet into a thick sheet, wherein the longitudinal stretching preheating temperature is 60 ℃, the stretching temperature is 100 ℃, and the stretching magnification is 3.5 times; transversely stretching the thick sheet to obtain a BOPET film, wherein the transverse line stretching preheating temperature is 90 ℃, the stretching temperature is 100 ℃, the stretching magnification is 3.5 times, and the setting temperature is 200 ℃;
and S4, air cooling, drawing, rolling, slitting and packaging the BOPET film to obtain the finished product.
The BOPET films obtained in examples 1 to 3 and comparative example 1 were subjected to performance tests, and the detection standards and the detection results are shown in Table 1.
TABLE 1 data on the Performance parameters of examples 1-3 and comparative example 1
Figure BDA0002480079570000071
As can be seen from Table 1, the BOPET film prepared in the embodiment of the invention has excellent antibacterial effect while the barrier property of the film is remarkably improved, and the haze optical property and other mechanical properties of the film are good.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (10)

1. The antibacterial barrier BOPET film is composed of an upper surface layer, a core layer and a lower surface layer, and is characterized in that the upper surface layer and the lower surface layer are antibacterial layers and are prepared from the following raw materials: silver-loaded carbon nanotubes, glass beads and polyester chips; the core layer is a barrier layer and is prepared from the following raw materials: EVOH, nano montmorillonite and polyester chip.
2. The antibacterial barrier BOPET film according to claim 1, wherein the antibacterial layer is prepared from the following raw materials in percentage by weight: 1.0-1.2% of silver-loaded carbon nano tube, 0.3-0.4% of glass bead and the balance of polyester chip;
the core layer is prepared from the following raw materials in parts by weight: 10-15% of EVOH, 0.5-0.8% of nano montmorillonite and the balance of polyester chips.
3. The antimicrobial barrier BOPET film of claim 1 or 2, wherein the silver-loaded carbon nanotubes are made using multiwall carbon nanotubes and silver nitrate solution.
4. The antibacterial barrier BOPET film according to any one of claims 1 to 3, wherein the glass beads have an average particle size of 1.5 to 2 μm.
5. The antibacterial barrier BOPET film according to any one of claims 1 to 4, wherein the thicknesses of the upper surface layer and the lower surface layer are 12-14% of the total thickness of the film respectively.
6. A method of making the antimicrobial barrier BOPET film of any one of claims 1-5, comprising the steps of:
s1, uniformly mixing EVOH, nano-montmorillonite and polyester chips, extruding the mixture by a double-screw extruder, drying the mixture, adding the dried mixture into a main extruder, melting and filtering the mixture to prepare a core layer melt; uniformly mixing the silver-loaded carbon nano tube, the glass beads and the polyester slices, extruding and drying the mixture by a double-screw extruder, respectively adding the mixture into two auxiliary extruders, and melting and vacuumizing the mixture to prepare upper and lower surface layer melts; co-extruding the core layer melt and the upper and lower surface layer melts by adopting a three-layer structure die head to prepare a membrane;
s2, attaching the film-forming sheet to a chill roll and cooling to obtain a cast sheet;
s3, longitudinally stretching the cast sheet into a thick sheet, and transversely stretching the thick sheet to obtain a BOPET film;
and S4, air cooling, drawing, rolling, slitting and packaging the BOPET film to obtain the finished product.
7. The preparation method of the antibacterial barrier BOPET film according to claim 6, wherein in S1, a main extruder is a single-screw extruder, and the extrusion temperature is 265-270 ℃; preferably, the auxiliary extruder is a double-screw extruder, and the extrusion temperature is 270-275 ℃; preferably, the extrusion temperature of the three-layer co-extrusion is 270-272 ℃.
8. The preparation method of the antibacterial barrier BOPET film according to claim 6, wherein in S1, raw materials of the core layer are mixed and extruded by a double-screw extruder, and then fluidized bed drying is adopted, wherein the drying temperature is 140-150 ℃, and the drying time is 4-5 h; preferably, the filtration is performed using a 15 μm disc filter.
9. The method of claim 6, wherein in S2, the cooling temperature of the cast sheet is 20-25 ℃.
10. The method for preparing the antibacterial barrier BOPET film according to claim 6, wherein in S3, the preheating temperature in longitudinal stretching is 60-95 ℃, the stretching temperature is 100-110 ℃, and the stretching ratio is 3.5-4.0 times; preferably, the preheating temperature in transverse stretching is 90-100 ℃, the stretching temperature is 100-120 ℃, the stretching magnification is 3.5-4.0 times, and the setting temperature is 200-230 ℃.
CN202010376031.2A 2020-05-07 2020-05-07 Antibacterial barrier BOPET film and preparation method thereof Pending CN111703160A (en)

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Application publication date: 20200925