CN115352160A - BOPE film and preparation method thereof - Google Patents

BOPE film and preparation method thereof Download PDF

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Publication number
CN115352160A
CN115352160A CN202210932246.7A CN202210932246A CN115352160A CN 115352160 A CN115352160 A CN 115352160A CN 202210932246 A CN202210932246 A CN 202210932246A CN 115352160 A CN115352160 A CN 115352160A
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surface layer
stretching
bope film
master batch
core layer
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毛健全
王永祥
蒋晓伟
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Furong New Materials Co ltd
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Furong New Materials 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/02—Deburring or deflashing
    • 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
    • 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
    • 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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
    • 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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • 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
    • B32B2439/00—Containers; Receptacles
    • 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
    • C08J2323/06—Polyethene
    • 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
    • C08J2423/06—Polyethene
    • 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
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The invention provides a BOPE film and a preparation method thereof, wherein the BOPE film comprises the following components: the core layer comprises a first surface layer, a core layer and a second surface layer; the raw materials of the first surface layer and the second surface layer comprise: one or more of HDPE, LLDPE, MDPE, LDPE, an antiblocking masterbatch; the core layer comprises the following raw materials: one or more of HDPE, LLDPE, MDPE and LDPE, an antistatic agent master batch and a smooth master batch; the preparation method comprises the following steps: respectively melting the first surface layer raw material, the core layer raw material and the second surface layer raw material, and extruding the molten materials through a three-layer extrusion die head; cooling and solidifying the flowing melt into thick pieces; longitudinally stretching and transversely stretching the slab to obtain a prefabricated product; and carrying out corona treatment on one side or two sides of the prefabricated product to obtain the BOPE film. The BOPE film prepared by the invention has excellent mechanical strength and lower thermal shrinkage rate, can be used for repackaging, realizes the design and development of a single-material composite packaging structure in downstream application, is beneficial to recycling, and promotes the development of environmental protection and circular economy.

Description

BOPE film and preparation method thereof
Technical Field
The disclosure relates to the technical field of high polymer materials, and particularly relates to a BOPE film and a preparation method thereof.
Background
At present, the production of PE films mainly adopts a traditional blow molding method (IPE) and a casting method (CPE), the traditional IPE films and CPE films produced by the blow molding or casting methods have defects in physical properties and lack effective competitiveness in the field of packaging, and the optical properties and mechanical properties of the biaxially oriented polyethylene films (BOPE) obtained by the biaxially oriented molding method are greatly improved.
At present, most of raw materials for producing biaxially oriented BOPE films are Linear Low Density Polyethylene (LLDPE), the BOPE films prepared from the LLDPE have low strength and poor heat resistance, so that the heat shrinkage is obvious, and the BOPE films are greatly hindered in downstream application due to the phenomena of color misregistration, shrinkage, deformation and the like during downstream printing, compounding and bag making.
Disclosure of Invention
The present disclosure provides a BOPE film and a method for preparing the same, to at least solve the above technical problems in the prior art.
According to a first aspect of the present disclosure, there is provided a BOPE film comprising:
a first surface layer;
a core layer; and
a second skin layer;
the raw materials of the first surface layer and the second surface layer comprise: one or more of high density polyethylene HDPE, linear low density polyethylene LLDPE, medium density polyethylene MDPE and low density polyethylene LDPE, and anti-blocking master batch;
the core layer comprises the following raw materials: one or more of high density polyethylene HDPE, linear low density polyethylene LLDPE, medium density polyethylene MDPE and low density polyethylene LDPE, and an antistatic agent master batch.
In one embodiment, the effective component of the anti-blocking masterbatch in the first skin layer and the second skin layer is one or more of silica, magnesium silicate, talc, and diatomaceous earth.
In one embodiment, the active ingredient of the antistatic agent masterbatch in the core layer comprises one of glycerol monoglyceride, ammonium ethoxyfatty acid, and ethanol amino compound.
In one embodiment, the raw material of the core layer further comprises a smooth master batch;
the effective components of the smooth master batch are one or more of erucamide, stearic acid amide, oleic acid amide and ethylene bisstearic acid amide.
In an embodiment, the first surface layer and the second surface layer are made of the following raw materials by mass percent: 40-80% of HDPE, 17-55% of LLDPE and 3-5% of anti-blocking master batch.
In one embodiment, the core layer is made of the following raw materials in percentage by mass: 40-80% of HDPE, 16.8-49.5% of LLDPE, 3-8% of LDPE, 0.2-2% of antistatic agent master batch and 0-0.5% of slipping agent master batch.
In one embodiment, the thickness of the first surface layer and the second surface layer is 1-3 μm; the thickness of the core layer is 18-44 μm.
According to a second aspect of the present disclosure, there is provided a method for preparing a BOPE film, the method comprising:
respectively melting the first surface layer raw material, the core layer raw material and the second surface layer raw material, filtering the melted melt, and extruding through a three-layer extrusion die head; cooling and solidifying the flowing melt into thick pieces;
respectively carrying out longitudinal stretching and transverse stretching on the thick sheet to obtain a prefabricated product;
and cutting off burrs with uneven thickness on two sides of the prefabricated product, and then carrying out corona treatment on one side or two sides of the prefabricated product to obtain the BOPE film.
In one embodiment, the slab is stretched in the machine direction and in the transverse direction, respectively, to obtain a preform comprising:
the thick sheet enters a longitudinal stretching area and is subjected to preheating, stretching and qualitative three areas, wherein the longitudinal stretching magnification is 4-7 times, the temperature of the preheating area is 115-125 ℃, the temperature of the stretching area is 100-115 ℃, and the temperature of the qualitative area is 120-130 ℃;
and (3) feeding the longitudinally stretched thick sheet into a transverse stretching area, preheating, stretching, qualifying and cooling the thick sheet, wherein the transverse stretching ratio is 7-10 times, the temperature of the preheating area is gradually reduced from 130 ℃ to 110 ℃, the temperature of the stretching area is 125-130 ℃, the temperature of the qualifying area is 128-132 ℃, and then cooling the thick sheet to obtain the prefabricated product.
The invention provides a BOPE film and a preparation method thereof, the structure of the BOPE film comprises a first surface layer, a core layer and a second surface layer, wherein the first surface layer and the second surface layer are formed by blending HDPE and other PE, and the core layer is formed by blending PE with various densities, so that the heat shrinkage rate of the BOPE film can be effectively reduced, and the mechanical strength of the BOPE film can be improved. The BOPE film prepared by the preparation method disclosed by the invention has low thermal shrinkage and excellent mechanical strength, can be used for heavy packaging, can realize the design and development of a single-material composite packaging structure in downstream application, is favorable for recycling, and promotes the development of environmental protection and circular economy.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, like or corresponding reference characters designate like or corresponding parts.
FIG. 1 shows a schematic structural diagram of a BOPE film provided by the present disclosure;
fig. 2 shows a schematic flow chart of a method for preparing a BOPE film provided by the present disclosure.
Detailed Description
In order to make the objects, features and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Fig. 1 shows a schematic structural diagram of a BOPE film provided by the present invention, the BOPE film sequentially includes, from top to bottom:
a first surface layer, a core layer and a second surface layer; wherein the first surface layer and the second surface layer have a thickness of 1-3 μm and the core layer has a thickness of 18-44 μm.
Wherein, the raw materials of first top layer and second top layer include: one or more of high density polyethylene HDPE, linear low density polyethylene LLDPE, medium density polyethylene MDPE and low density polyethylene LDPE, and anti-blocking master batch. The raw materials of the first surface layer and the second surface layer are preferably as follows: the anti-blocking agent comprises high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE) and an anti-blocking master batch, wherein the effective component of the anti-blocking master batch is one or more of silicon dioxide, magnesium silicate, talcum powder and diatomite, and the anti-blocking master batch is a blend of the effective component with an anti-blocking effect and PE.
The core layer comprises the following raw materials: one or more of high density polyethylene HDPE, linear low density polyethylene LLDPE, medium density polyethylene MDPE and low density polyethylene LDPE, and an antistatic agent master batch. The raw materials of the core layer are preferably as follows: high density polyethylene HDPE, linear low density polyethylene LLDPE, low density polyethylene LDPE, elastomer and antistatic agent masterbatch. The active ingredients of the antistatic agent master batch comprise one or more of glycerol monoglyceride, ethoxy fatty acid ammonium and ethanol amino compounds, and the antistatic agent master batch is a blend of the active ingredients with antistatic effect and PE.
In one example, the core layer raw material further comprises a smooth master batch, and the effective component of the smooth master batch is one or more of erucamide, stearic acid amide, oleic acid amide and ethylene bis-stearic acid amide.
In one example, the first surface layer and the second surface layer are made of the following raw materials in percentage by mass: 40-80% of HDPE, 17-55% of LLDPE and 3-5% of anti-blocking master batch.
In one example, the core layer is made from the following raw materials in percentage by mass: 40-80% of HDPE, 16.8-49.5% of LLDPE, 3-8% of LDPE, 0.2-2% of antistatic agent master batch and 0-0.5% of slipping agent master batch.
The invention also provides a preparation method of the BOPE film, as shown in FIG. 2, which is a schematic flow chart of the preparation method of the BOPE film, and the method comprises the following steps:
s1, respectively melting a first surface layer raw material, a core layer raw material and a second surface layer raw material, filtering the molten materials, and extruding the filtered molten materials through a three-layer extrusion die head; cooling and solidifying the flowing melt into thick pieces;
s2, respectively carrying out longitudinal stretching and transverse stretching on the thick sheet to obtain a prefabricated product;
and S3, cutting off burrs with uneven thickness on two sides of the prefabricated product, and then carrying out corona treatment on one side or two sides of the prefabricated product to obtain the BOPE film.
Step S2, respectively carrying out longitudinal stretching and transverse stretching on the slab to obtain a prefabricated product, wherein the method comprises the following steps:
s21, enabling the thick sheet to enter a longitudinal stretching area, and performing preheating, stretching and qualitative determination in three areas, wherein the longitudinal stretching magnification is 4-7 times, the temperature of the preheating area is 115-125 ℃, the temperature of the stretching area is 100-115 ℃, and the temperature of the qualitative determination area is 120-130 ℃;
s22, the longitudinally stretched slab enters a transverse stretching area, and is subjected to preheating, stretching, qualitative determination and cooling, wherein the transverse stretching magnification is 7-10 times, the temperature of the preheating area is gradually reduced from 130 ℃ to 110 ℃, the temperature of the stretching area is 125-130 ℃, the temperature of the qualitative determination area is 128-132 ℃, and then cooling is carried out, so that the preform is obtained.
In the scheme of the invention, the BOPE film comprises a first surface layer, a core layer and a second surface layer, wherein the first surface layer and the second surface layer are formed by blending HDPE and other PE, and the core layer is added with an elastomer, so that the thermal shrinkage rate of the BOPE film can be effectively reduced, and the mechanical strength of the BOPE film can be improved. The BOPE film prepared by the preparation method disclosed by the invention has low thermal shrinkage and excellent mechanical strength, can be used for heavy packaging, can realize the design and development of a single-material composite packaging structure in downstream application, is favorable for recycling, and promotes the development of environmental protection and circular economy.
The present invention will be described in detail with reference to specific examples.
Example 1
A BOPE film comprising:
the core layer comprises a first surface layer, a core layer and a second surface layer.
The first surface layer and the second surface layer are made of the following raw materials in percentage by mass: HDPE 52%, LLDPE 45% and anti-adhesion master batch 3%, wherein the effective component of the anti-adhesion master batch is silicon dioxide.
The core layer is prepared from the following raw materials in percentage by mass: 57% of HDPE, 36.5% of LLDPE, 5% of LDPE, 1% of antistatic agent master batch and 0.5% of smooth master batch; the effective component of the antistatic agent master batch is glycerol monoglyceride, and the effective component of the slipping master batch is erucamide.
A preparation method of a BOPE film comprises the following steps:
a1, drying and weighing a first surface layer raw material, a core layer raw material and a second surface layer raw material, wherein the mass ratio of the first surface layer raw material to the core layer raw material to the second surface layer raw material is 1; after filtering, mixing and extruding the three-layer melt through a three-layer co-extrusion die head, wherein the temperature of the die head is 248 ℃; attaching the extruded melt to the surface of a chilling roller through compressed air blown by a fan air knife, rapidly cooling and solidifying the extruded melt into a thick sheet, controlling the temperature of the chilling roller at 35-40 ℃, cooling the thick sheet through a water bath, and then carrying out water removal treatment on the cooled thick sheet by using the compressed air.
A2, respectively carrying out longitudinal stretching and transverse stretching on the thick sheet to obtain a prefabricated product;
a21, feeding the thick sheet into a longitudinal stretching area, heating the longitudinal stretching area by using a roller, wherein the longitudinal stretching area comprises three areas of preheating, stretching and qualitative operation, the temperature of the preheating area is gradually heated from 115 ℃ to 125 ℃, the temperature of the stretching area is 100-115 ℃, the temperature of the shaping area is 125 ℃, and the longitudinal stretching magnification is 5 times.
A22, after longitudinally stretching the film, feeding the film into a transverse stretching area, blowing air to heat the transverse stretching area through an air box, wherein the transverse stretching area comprises four areas of preheating, stretching, determining the nature and cooling, the preheating temperature of the stretching area is gradually reduced to 110 ℃ from 130 ℃ at an inlet, the temperature of the stretching area is 126 ℃, the temperature of the setting area is 130 ℃, and then blowing air to cool the film, wherein the transverse stretching multiplying power of the film is 8 times.
A3, after the film is taken out from the transverse pulling area, the film is pulled, cooled and flattened by a guide roller in a pulling area, thick sheets on two sides are cut off, corona treatment is carried out on electrodes on the upper surface and the lower surface, the film passes through a corona generator, namely, between the two electrodes existing at high voltage, the air between the electrodes is ionized by the high voltage to generate electron current, an oxidation polarization base is formed on the surface of the film, the polarity is generated on the surface of the film, the roughness and the adhesiveness of the surface of the film are improved, and printing ink is convenient to adhere; in the corona process, chemical bonds of the high molecules of the film are broken and degraded, the surface roughness and the surface area of the film are increased, a large amount of ozone is also generated during discharge, the ozone is a strong oxidant and can oxidize the high molecules to generate radicals with stronger polarity, such as carbonyl, peroxide and the like, so that the surface energy of the film is improved. And finally, rolling on a machine, and performing aging treatment to obtain the biaxially oriented BOPE film.
Performance testing
1. Tensile strength
The BOPE film prepared in example 1 was tested for tensile strength according to GB/T1040.3-2006-test for tensile properties in the transverse direction TD and the machine direction MD.
2. Thermal shrinkage rate
Taking a BOPE film with specified length and width as a sample, respectively testing the shrinkage rate of the BOPE film in an oven heated at 100 ℃ for 2min and at 130 ℃ for 20s, and calculating according to the following formula:
shrinkage (%) = (length before heating-length after heating)/length before heating × 100%
TABLE 1 BOPE film Properties prepared in example 1
Figure BDA0003781944450000071
As can be seen from table 1, the BOPE film prepared in example 1 has excellent mechanical strength (i.e., tensile strength) and low heat shrinkage.
Example 2
A BOPE film comprising:
the core layer comprises a first surface layer, a core layer and a second surface layer.
The first surface layer and the second surface layer are prepared from the following raw materials in percentage by mass: 60% of HDPE, 35% of LLDPE and 5% of anti-adhesion master batch, wherein the effective component of the anti-adhesion master batch is magnesium silicate.
The core layer is prepared from the following raw materials in percentage by mass: 66% of HDPE, 25% of LLDPE, 3% of MDPE, 4% of LDPE, 1.5% of antistatic agent master batch and 0.5% of smooth master batch; the antistatic agent master batch comprises the effective components of ethoxy fatty acid ammonium, and the effective components of the smooth master batch comprise erucamide and oleamide (the mass ratio is 1.
A preparation method of a BOPE film comprises the following steps:
b1, drying and weighing a first surface layer raw material, a core layer raw material and a second surface layer raw material, wherein the mass ratio of the first surface layer raw material to the core layer raw material to the second surface layer raw material is 1; after filtering, mixing and extruding the three-layer melt through a three-layer co-extrusion die head, wherein the die head temperature is 248 ℃; attaching the extruded melt to the surface of a chilling roller through compressed air blown by a fan air knife, rapidly cooling and solidifying the extruded melt into a thick sheet, controlling the temperature of the chilling roller at 35-40 ℃, cooling the thick sheet through a water bath, and then carrying out water removal treatment on the cooled thick sheet by using the compressed air.
B2, respectively carrying out longitudinal stretching and transverse stretching on the thick sheet to obtain a prefabricated product;
b21, enabling the thick sheet to enter a longitudinal stretching area, heating the longitudinal stretching area by using a roller, wherein the longitudinal stretching area comprises three areas of preheating, stretching and qualitative determination, the temperature of the preheating area is gradually heated from 115 ℃ to 125 ℃, the temperature of the stretching area is 100-115 ℃, the temperature of the shaping area is 125 ℃, and the longitudinal stretching magnification is 7 times.
And B22, after longitudinally stretching the film, feeding the film into a transverse stretching area, blowing air for heating the transverse stretching area through an air box, wherein the transverse stretching area comprises four areas of preheating, stretching, determining the nature and cooling, the preheating temperature of the stretching area is gradually reduced from 130 ℃ at an inlet to 110 ℃, the temperature of the stretching area is 128 ℃, the temperature of the setting area is 130 ℃, and then blowing air for cooling is carried out, and the transverse stretching multiplying power of the film is 10 times.
And B3, after the film is taken out from the transverse pulling area, the film is pulled, cooled and flattened by a guide roller in a pulling area, thick sheets on two sides are cut off, the electrodes on the upper surface and the lower surface are subjected to corona treatment, and finally the film is wound on a machine and subjected to aging treatment to obtain the biaxially oriented BOPE film.
The performance of the BOPE film prepared in example 2 was tested as in example 1.
TABLE 2 BOPE film Properties prepared in example 2
Figure BDA0003781944450000091
As can be seen from table 2, the BOPE film prepared in example 2 has excellent mechanical strength (i.e., tensile strength) and low thermal shrinkage.
Example 3
A BOPE film comprising:
the core layer comprises a first surface layer, a core layer and a second surface layer.
The first surface layer and the second surface layer are made of the following raw materials in percentage by mass: 75% of HDPE, 20% of LLDPE and 5% of anti-adhesion master batch, wherein the effective components of the anti-adhesion master batch are silica and talcum powder (mass ratio 1.
The core layer is prepared from the following raw materials in percentage by mass: 75% of HDPE, 19% of LLDPE, 5% of LDPE, 0.8% of antistatic agent master batch and 0.2% of smooth master batch; the effective component of the antistatic agent master batch is ethoxy fatty acid ammonium, and the effective component of the smooth master batch is stearic acid amide.
A preparation method of a BOPE film comprises the following steps:
c1, drying and weighing a first surface layer raw material, a core layer raw material and a second surface layer raw material, wherein the mass ratio of the first surface layer raw material to the core layer raw material to the second surface layer raw material is 1; after filtering, mixing and extruding the three-layer melt through a three-layer co-extrusion die head, wherein the die head temperature is 248 ℃; attaching the extruded melt to the surface of a chilling roller through compressed air blown by a fan air knife, rapidly cooling and solidifying the extruded melt into a thick sheet, controlling the temperature of the chilling roller at 35-40 ℃, cooling the thick sheet through a water bath, and then carrying out water removal treatment on the cooled thick sheet by using the compressed air.
C2, respectively carrying out longitudinal stretching and transverse stretching on the thick sheet to obtain a prefabricated product;
and C21, enabling the thick sheet to enter a longitudinal stretching area, heating the longitudinal stretching area by using a roller, wherein the longitudinal stretching area comprises three areas of preheating, stretching and qualitative determination, the temperature of the preheating area is gradually heated from 115 ℃ to 125 ℃, the temperature of the stretching area is 100-115 ℃, the temperature of the shaping area is 125 ℃, and the longitudinal stretching magnification is 6 times.
C22, after longitudinally stretching the film, enabling the film to enter a transverse stretching area, blowing air for heating the transverse stretching area through an air box, wherein the transverse stretching area comprises four areas of preheating, stretching, determining the nature and cooling, the preheating temperature of the stretching area is gradually reduced to 110 ℃ from 130 ℃ at an inlet, the temperature of the stretching area is 126 ℃, the temperature of the setting area is 130 ℃, and then blowing air for cooling is carried out, and the transverse stretching multiplying power of the film is 9 times.
And C3, after the film is pulled out from the transverse pulling area, the film is pulled, cooled and flattened by a guide roller in a pulling area, thick sheets on two sides are cut off, the electrodes on the upper surface and the lower surface are subjected to corona treatment, and finally the film is wound on a machine and subjected to aging treatment to obtain the biaxially oriented BOPE film.
The performance of the BOPE film prepared in example 3 was tested as in example 1.
TABLE 2 BOPE film Properties prepared in example 2
Figure BDA0003781944450000101
As can be seen from table 3, the BOPE film prepared in example 3 has excellent mechanical strength (i.e., tensile strength) and low thermal shrinkage.
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, and the present disclosure is not limited herein.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims (9)

1. A BOPE film, comprising:
a first skin layer;
a core layer; and
a second skin layer;
the raw materials of the first surface layer and the second surface layer comprise: one or more of high density polyethylene HDPE, linear low density polyethylene LLDPE, medium density polyethylene MDPE and low density polyethylene LDPE, and anti-blocking master batch;
the core layer comprises the following raw materials: one or more of high density polyethylene HDPE, linear low density polyethylene LLDPE, medium density polyethylene MDPE and low density polyethylene LDPE, and an antistatic agent master batch.
2. The BOPE film of claim 1, wherein the effective component of the anti-blocking masterbatch in the first skin layer and the second skin layer is one or more of silica, magnesium silicate, talc, and diatomaceous earth.
3. The BOPE film of claim 1, wherein the active ingredient of the antistatic agent masterbatch in the core layer comprises one or more of glycerol monoglyceride, ammonium ethoxylated fatty acid ester, and ethanol amino compound.
4. The BOPE film according to claim 1 or 3, wherein the raw material of the core layer further comprises a slip masterbatch;
the effective components of the smooth master batch are one or more of erucamide, stearic acid amide, oleic acid amide and ethylene bisstearic acid amide.
5. The BOPE film according to claim 1, wherein the first surface layer and the second surface layer are made of the following raw materials in percentage by mass: 40-80% of HDPE, 17-55% of LLDPE and 3-5% of anti-blocking master batch.
6. The BOPE film according to claim 1 or 4, wherein the core layer is prepared from the following raw materials in percentage by mass: 40-80% of HDPE, 16.8-49.5% of LLDPE, 3-8% of LDPE, 0.2-2% of antistatic agent master batch and 0-0.5% of slipping agent master batch.
7. The BOPE film of claim 1, wherein the thickness of the first skin layer and the second skin layer is 1-3 μ ι η; the thickness of the core layer is 18-44 μm.
8. A method of preparing a BOPE film according to any one of claims 1 to 7, wherein the method comprises:
respectively melting the first surface layer raw material, the core layer raw material and the second surface layer raw material, filtering the molten body, and extruding through a three-layer extrusion die head; cooling and solidifying the outflow melt into thick pieces;
respectively carrying out longitudinal stretching and transverse stretching on the thick sheet to obtain a prefabricated product;
and cutting off burrs with uneven thickness on two sides of the prefabricated product, and then carrying out corona treatment on one side or two sides of the prefabricated product to obtain the BOPE film.
9. The method of producing a BOPE film according to claim 8, wherein the slab is subjected to longitudinal stretching and transverse stretching to obtain a preform, respectively, comprising:
the thick sheet enters a longitudinal stretching area and is subjected to preheating, stretching and qualitative three areas, wherein the longitudinal stretching magnification is 4-7 times, the temperature of the preheating area is 115-125 ℃, the temperature of the stretching area is 100-115 ℃, and the temperature of the qualitative area is 120-130 ℃;
and (2) feeding the longitudinally stretched slab into a transverse stretching area, preheating, stretching, determining the quality and cooling the slab, wherein the transverse stretching ratio is 7-10 times, the temperature of the preheating area is gradually reduced from 130 ℃ to 110 ℃, the temperature of the stretching area is 125-130 ℃, the temperature of the determining area is 128-132 ℃, and then cooling the slab to obtain the preform.
CN202210932246.7A 2022-08-04 2022-08-04 BOPE film and preparation method thereof Pending CN115352160A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102774110A (en) * 2012-07-13 2012-11-14 杭州德雅包装有限公司 Biaxially-oriented polyethylene shrink film and production technique thereof
CN111941970A (en) * 2020-08-06 2020-11-17 安徽金田高新材料股份有限公司 Biaxially oriented BOPE film and preparation method thereof
CN112874092A (en) * 2021-01-14 2021-06-01 广东德冠薄膜新材料股份有限公司 High-stiffness heat-resistant BOPE film and preparation method thereof
CN113601932A (en) * 2021-08-09 2021-11-05 广东德冠薄膜新材料股份有限公司 Biaxially oriented polyethylene film, preparation method thereof and polyethylene barrier film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102774110A (en) * 2012-07-13 2012-11-14 杭州德雅包装有限公司 Biaxially-oriented polyethylene shrink film and production technique thereof
CN111941970A (en) * 2020-08-06 2020-11-17 安徽金田高新材料股份有限公司 Biaxially oriented BOPE film and preparation method thereof
CN112874092A (en) * 2021-01-14 2021-06-01 广东德冠薄膜新材料股份有限公司 High-stiffness heat-resistant BOPE film and preparation method thereof
CN113601932A (en) * 2021-08-09 2021-11-05 广东德冠薄膜新材料股份有限公司 Biaxially oriented polyethylene film, preparation method thereof and polyethylene barrier film

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Application publication date: 20221118