CN111703162A - Scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film and preparation method thereof - Google Patents
Scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film and preparation method thereof Download PDFInfo
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- CN111703162A CN111703162A CN202010516791.9A CN202010516791A CN111703162A CN 111703162 A CN111703162 A CN 111703162A CN 202010516791 A CN202010516791 A CN 202010516791A CN 111703162 A CN111703162 A CN 111703162A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
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- 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
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- 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
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- 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
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- 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
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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
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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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
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
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- 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
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- 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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- 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
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- 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
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- 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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
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- 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
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- 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
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
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- 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
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
Abstract
The invention discloses a scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film which sequentially comprises an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer. The invention also discloses a preparation method of the anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film. The film prepared by the invention has high hardness of the outer surface layer, excellent scratch-resistant effect, excellent water-oxygen barrier property without a composite barrier material, high bonding force among layers, no layering, no need of coating a Polyethyleneimine (PEI) primer on the inner surface layer, direct bonding with ethylene-vinyl acetate copolymer (EVA) melt, high bonding strength, and can be used for surface coating of products such as books, magazines, cigarette and wine gift boxes, the production efficiency of downstream customers is greatly improved, the processing cost is reduced, the linear cutting property after coating is good, the mechanical property of the film is excellent, the size stability is good, the longitudinal and transverse shrinkage rates are low, and the processing technology is simple.
Description
Technical Field
The invention relates to the technical field of films, in particular to a scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film and a preparation method thereof.
Background
The BOPP film is widely used for film-coated packaging of books, magazines and gift boxes due to excellent performances of optics, printing and the like, but because the BOPP film does not have scratch resistance, in the field of high-grade film coating, a photosensitive curing type scratch-resistant coating needs to be coated on the surface of the film, the processing efficiency is low, Volatile Organic Compounds (VOC) pollution exists, and the cost is high.
The BOPP film has poor barrier property, particularly poor oxygen barrier property, and generally needs to be subjected to secondary processing when being used for packaging in the barrier field, and is compounded with other barrier materials. The barrier packaging materials on the market mainly comprise polyvinylidene chloride (PVDC) coating films, aluminum-plated films, aluminum foils, nylon films and the like, and the barrier packaging materials have more defects:
(1) PVDC coating film: special coating equipment is needed, the use procedures of downstream customers are more, the cost is high, the efficiency is low, a large amount of VOC can be generated in the coating process, and toxic and harmful substances such as hydrogen chloride, dioxin and the like can be generated when the waste is combusted;
(2) aluminum film plating and aluminum foil plating: the product is opaque, the folding resistance is poor, the product is difficult to recycle after being compounded, and the waste has great pollution to the environment;
(3) nylon membrane: the cost of raw materials is high, the product is easy to absorb moisture, and the barrier property is greatly reduced after moisture absorption;
(4) the processing procedures are increased, and the cost is greatly improved.
The BOPP film has low surface polarity and can not be directly adhered to paper, a PEI primer is coated on the surface layer of the BOPP film in advance before use, then the BOPP film is extruded and compounded with molten polyvinyl acetate (EVA) hot melt adhesive, and the BOPP film is prepared after cooling and shaping, can be directly hot-pressed and compounded with the paper, and is widely applied to the field of paper-plastic compounding.
The pre-coating technology is widely applied in European and American countries at present, and becomes the mainstream of the laminating technology in China in recent years. However, this process also has more disadvantages:
1) in the production process of the pre-coating film, the volatile solvent of the primer and ozone generated by corona treatment pollute the production environment;
2) the primer affects the appearance of the pre-coated film, and the product is easy to yellow at the later stage;
3) the coating of the primer can increase the production process and energy consumption of a pre-coating film, and needs to be matched with a corona pretreatment device, an ozone removal device, a coating drying device and the like, so that the equipment investment cost is high, and the occupied area is large;
4) the production speed is greatly influenced by the drying speed of the primer, and the production efficiency is low.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film and a preparation method thereof.
The invention provides a scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film which sequentially comprises an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer;
the outer surface layer is prepared from the following raw materials in percentage by mass: 1-5% of antistatic master batch, 1-10% of ultra-smooth polypropylene anti-sticking master batch, 10-20% of carbon nanotube modified polypropylene composite material, 10-20% of glass fiber reinforced modified polypropylene and the balance of maleic anhydride graft modified homo-polypropylene;
the outer subsurface layer is prepared from the following raw materials in percentage by mass: 10-20% of ethylene-propylene-ethylene glycol block copolymer, 10-20% of maleic anhydride grafted homo-polypropylene and the balance of polyvinyl alcohol;
the core layer is prepared from the following raw materials in percentage by mass: 1-5% of metallocene linear low-density polyethylene, 1-15% of ethylene-propylene-butadiene terpolymer, 10-35% of maleic anhydride graft modified homo-polypropylene and the balance of polypropylene;
the inner surface layer is prepared from the following raw materials in percentage by mass: 1-10% of an ultralow-friction anti-sticking master batch, 1-5% of maleic anhydride graft modified homo-polypropylene, 1-5% of low-density polyethylene, 1-5% of an ethylene-propylene-butadiene terpolymer and the balance of metallocene linear low-density polyethylene.
Preferably, the ethylene-propylene-ethylene glycol block copolymer is prepared by taking an ethylene-propylene random copolymer with an ethylene chain segment proportion of 5-20% as a raw material to prepare a hydroxyl-terminated ethylene-propylene random copolymer, and then mixing the isocyanate-terminated polyethylene glycol and the hydroxyl-terminated ethylene-propylene random copolymer according to a mass ratio of (10-40): (60-90) mixing and reacting.
Preferably, the preparation method of the ethylene-propylene-ethylene glycol block copolymer comprises the following steps:
(1) taking ethylene and propylene as raw materials, wherein the mass ratio of the ethylene to the propylene is (0.3-0.6) to 1, taking boroxy cyclopentadienyl titanium as a catalyst, taking high-purity nitrogen as a protective gas, and preparing an ethylene-propylene random copolymer with an ethylene chain segment proportion of 5-20% under the conditions of 0-5 ℃ and 3-5 MPa;
(2) using an ethylene-propylene random copolymer with an ethylene chain segment proportion of 5-20% as a raw material, firstly oxidizing with high-purity ozone to generate COOH groups and OH groups on the surface, and then hydrolyzing with hydrogen peroxide to prepare a hydroxyl-terminated ethylene-propylene random copolymer;
(3) the method comprises the following steps of (1) mixing terminal isocyanate group polyethylene glycol and the terminal hydroxyl ethylene-propylene random copolymer in a mass ratio of (10-40): (60-90), and reacting at 10-50 ℃ and 3.2-4.5 MPa to obtain the ethylene-propylene-ethylene glycol block copolymer.
Preferably, the super-smooth polypropylene anti-adhesion master batch is prepared by adding anti-adhesion particles in the polymerization process of propylene to synthesize polypropylene, and the super-smooth polypropylene anti-adhesion master batch consists of the following components in percentage by mass: 3-8% of anti-adhesion particles and the balance of isotactic polypropylene; preferably, the anti-blocking particles are organic porous glass microspheres with the particle size distribution of 2.5-7.8 μm and the average particle size of 5.2 μm.
Preferably, the preparation method of the ultra-smooth polypropylene anti-sticking master batch comprises the following steps: adding the anti-blocking particles into liquid propylene, and carrying out polymerization reaction at 68-72 ℃ and under the condition of 2.8-3.2 MPa to obtain the super-smooth polypropylene anti-sticking master batch.
Preferably, the carbon nanotube modified polypropylene composite material is prepared from the following raw materials in parts by mass: 40-60 parts of isotactic polypropylene, 10-20 parts of ethylene propylene random copolymer, 10-30 parts of carbon nanotube master batch, 4-8 parts of modified graphene, 10-20 parts of dispersing agent and 10-20 parts of compatilizer; preferably, in the carbon nano master batch, the content of the carbon nano tube is 15-25 wt%; preferably, the carbon nanotube master batch is prepared from the following raw materials in percentage by mass: 15-25% of carbon nano tube and the balance of polypropylene.
Preferably, the preparation method of the carbon nanotube modified polypropylene composite material comprises the following steps: weighing the raw materials according to the proportion, firstly mixing the raw materials for 30min by using a mixer, and then carrying out melt extrusion granulation by using a double-screw extruder to obtain the carbon nano tube modified polypropylene composite material, wherein the extrusion temperature is 250-255 ℃.
Preferably, the ultralow-friction anti-adhesion master batch is prepared by adding anti-adhesion particles and a dispersing agent in the copolymerization polymerization process of synthesizing metallocene linear low-density polyethylene, and the ultralow-friction anti-adhesion master batch consists of the following components in percentage by mass: 1.5-2.8% of anti-adhesion particles, 0.5-1.9% of dispersing agent and the balance of metallocene linear low density polyethylene; preferably, the anti-blocking particles are spherical porous silica with the particle size distribution of 2.0-10.0 μm and the average particle size of 5.0 μm.
Preferably, the thickness of the outer surface layer is 5-30 μm, the thickness of the outer subsurface layer is 2-10 μm, and the thickness of the inner surface layer is 0.5-5.0 μm.
The preparation method of the scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film comprises the following steps:
s1, heating and melting the raw materials of the outer surface layer, the outer subsurface layer, the core layer and the inner surface layer respectively, filtering respectively to obtain an outer surface layer melt, an outer subsurface layer melt, a core layer melt and an inner surface layer melt, and converging and extruding the outer surface layer melt, the outer subsurface layer melt, the core layer melt and the inner surface layer melt in a four-layer structure die head in sequence to form a melt sheet;
s2, attaching the melt sheet to a chill roll to form a cast sheet;
and S3, longitudinally stretching the casting sheet to obtain a thick sheet, and transversely stretching the thick sheet to obtain a thin film.
Preferably, the preheating temperature of longitudinal stretching is 100-150 ℃, the stretching temperature is 120-135 ℃, and the stretching ratio is 3.5-4.2, wherein the preheating of longitudinal stretching is to place the casting sheet on a roller, the temperature of the roller in contact with the outer surface of the casting sheet is 130-150 ℃, and the temperature of the roller in contact with the inner surface of the casting sheet is 100-120 ℃; the preheating temperature of transverse stretching is 165-180 ℃, the stretching temperature is 140-160 ℃, the heat setting temperature is 165-175 ℃, the stretching ratio is 7.5-9.0 times, and the retraction ratio is 2.0-5.0%.
Preferably, the core layer melt is filtered by a 360-400 mesh filter, the outer surface layer melt, the outer subsurface layer melt and the inner surface layer melt are respectively filtered by a 300-mesh filter, and the opening of a die lip of the die head is 2.0-4.5 mm.
Preferably, the temperature of the chilling roller is 20-40 ℃.
Preferably, after the film is transversely stretched in the step S3 to obtain the film, the film is subjected to air cooling at 20-35 ℃, enters a traction system to be cooled and flattened at 20-30 ℃, is wound, has a cut-in depth of-1.0-5.0 mm, and is subjected to aging treatment, slitting and packaging to obtain a finished product.
The invention has the following beneficial effects:
the film of the invention is composed of an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer in sequence, wherein the outer surface layer is a scratch-proof layer, the raw material of the outer surface layer is added with super-smooth polypropylene anti-sticking master batch which is prepared by adding anti-sticking particle organic porous glass beads in the polymerization reaction process of propylene to polypropylene, as the glass beads are added and fully mixed in the synthesis process of polypropylene, propylene chain segments are effectively embedded and penetrate through pores of the glass beads, simultaneously, the porous structure of the glass beads can greatly improve the binding power with the film surface layer, improve the dispersion effect, avoid agglomeration, can more effectively reduce the friction coefficient of the film, and can greatly reduce the scratch degree when the film is scratched, thereby improving the scratch-proof capability of the outer surface layer of the film, and the carbon nanotube modified polypropylene composite material is added, and through the introduction of carbon nanotubes and modified graphene with proper content, the hardness of the outer surface layer of the film is effectively improved, and the scratch resistance of the outer surface layer of the film is further improved; the outer subsurface layer is a barrier layer, the barrier effect is greatly improved by adding polyvinyl alcohol, and the compatibility of the polyvinyl alcohol and polypropylene is improved by adding a specific ethylene-propylene-ethylene glycol block copolymer, so that the adhesive force among the outer subsurface layer, the outer surface layer and the core layer of the film is improved, the delamination of the film is effectively avoided, and the quality of the film is improved; the inner surface layer is a primer-free layer, the low-density polyethylene, the ethylene-propylene-butadiene terpolymer and the metallocene linear low-density polyethylene with proper proportion are compounded, the cohesiveness of the inner surface layer of the film is greatly improved, the film can be directly adhered with paper, so that the effect of using the primer-free agent is achieved, the ultra-low friction anti-sticking master batch prepared by adding anti-sticking particles and dispersing agents in the copolymerization polymerization process of synthesizing the metallocene linear low-density polyethylene is added, because the metallocene linear low-density polyethylene chain segment is effectively embedded and penetrates through the pores of silicon dioxide, the cohesive force between the anti-sticking particles and the inner surface layer of the film can be greatly improved, the dispersion effect of the anti-sticking particles is improved, the agglomeration is avoided, the effect of reducing the film friction coefficient by the anti-sticking particles is better exerted, the downstream film operation efficiency is improved, and the homopolymerized polypropylene is grafted and modified, the compatibility among the components is improved.
The film prepared by the invention has high hardness of the outer surface layer, excellent scratch-resistant effect, excellent water-oxygen barrier property without a composite barrier material, high bonding force among layers, no layering, no need of coating a Polyethyleneimine (PEI) primer on the inner surface layer, direct bonding with ethylene-vinyl acetate copolymer (EVA) melt, high bonding strength, and can be used for surface coating of products such as books, magazines, cigarette and wine gift boxes, the production efficiency of downstream customers is greatly improved, the processing cost is reduced, the linear cutting property after coating is good, the mechanical property of the film is excellent, the size stability is good, the longitudinal and transverse shrinkage rates are low, and the processing technology is simple.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
In the following examples, an ethylene-propylene-ethylene glycol block copolymer was prepared by using an ethylene-propylene random copolymer having an ethylene segment ratio of 10% as a raw material to prepare a hydroxyl-terminated ethylene-propylene random copolymer, and then mixing a terminal isocyanate group polyethylene glycol with the hydroxyl-terminated ethylene-propylene random copolymer in a mass ratio of 20: 75 mixing and reacting to obtain; the super-smooth polypropylene anti-adhesion master batch is prepared by adding anti-adhesion particles in the polymerization reaction process of synthesizing polypropylene from propylene, and comprises the following components in percentage by mass: 5 percent of anti-adhesion particles and the balance of isotactic polypropylene, wherein the anti-adhesion particles are organic porous glass microspheres with the particle size distribution of 2.5-7.8 mu m and the average particle size of 5.2 mu m; the carbon nano tube modified polypropylene composite material is prepared from the following raw materials in parts by mass: 50 parts of isotactic polypropylene, 15 parts of ethylene-propylene random copolymer, 20 parts of carbon nanotube master batch, 6 parts of modified graphene, 15 parts of dispersing agent and 15 parts of compatilizer, wherein the preparation method comprises the following steps: weighing raw materials according to a ratio, mixing the raw materials for 30min by using a mixer, and then performing melt extrusion granulation by using a double-screw extruder to obtain the carbon nanotube modified polypropylene composite material, wherein the extrusion temperature is 250-255 ℃, the modified graphene manufacturer is Suzhou carbon Feng graphene science and technology company Limited, the product model is HQNANO-GR-027, and the carbon nanotube master batch is prepared from the following raw materials in percentage by mass: 20% of carbon nano tube and the balance of polypropylene; the ultra-low friction anti-adhesion master batch is prepared by adding anti-adhesion particles and a dispersing agent in the copolymerization polymerization process of synthesizing metallocene linear low-density polyethylene, and comprises the following components in percentage by mass: 2% of anti-blocking particles, 1% of dispersing agent and the balance of metallocene linear low density polyethylene, wherein the anti-blocking particles are spherical porous silica with the particle size distribution of 2.0-10.0 mu m and the average particle size of 5.0 mu m.
Example 1
The anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film sequentially comprises an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer;
the outer surface layer is prepared from the following raw materials in percentage by mass: 2% of antistatic master batch, 8% of ultra-smooth polypropylene anti-sticking master batch, 13% of carbon nanotube modified polypropylene composite material, 18% of glass fiber reinforced modified polypropylene and 59% of maleic anhydride graft modified homo-polypropylene;
the outer subsurface layer is prepared from the following raw materials in percentage by mass: 18% of ethylene-propylene-ethylene glycol block copolymer, 15% of maleic anhydride grafted homo-polypropylene and 67% of polyvinyl alcohol;
the core layer is prepared from the following raw materials in percentage by mass: 5% of metallocene linear low-density polyethylene, 10% of ethylene-propylene-butadiene terpolymer, 30% of maleic anhydride graft modified homo-polypropylene and 55% of polypropylene;
the inner surface layer is prepared from the following raw materials in percentage by mass: 2% of ultra-low friction anti-sticking master batch, 3% of maleic anhydride graft modified homo-polypropylene, 3% of low-density polyethylene, 5% of ethylene-propylene-butadiene terpolymer and 87% of metallocene linear low-density polyethylene.
Wherein, the thickness of the outer surface layer is 6 μm, the thickness of the outer sub-surface layer is 3 μm, the thickness of the inner surface layer is 2 μm, and the total thickness of the precoating basement membrane is 35 μm.
Preparing a precoated base film:
s1, adding the raw materials of the core layer into a double-screw extruder, heating and melting at 245 ℃, removing water vapor and small molecular impurities in the raw materials by using a vacuum filtration system under the condition that the vacuum negative pressure is 1.0mPa, and filtering by using a 400-mesh candle filter to obtain a core layer melt; respectively adding the raw material of the outer surface layer, the raw material of the outer subsurface layer and the raw material of the inner surface layer into three twin-screw extruders for heating and melting, and then respectively filtering by using a 300-mesh flat filter to obtain an outer surface layer melt, an outer subsurface layer melt and an inner surface layer melt; converging and extruding the core layer melt, the outer surface layer melt, the outer subsurface layer melt and the inner surface layer melt in a four-layer structure die head in sequence to form a melt sheet, wherein the opening degree of a die lip of the die head is 2.8 mm;
s2, attaching the melt sheet to a chill roll at 35 ℃ to form a cast sheet;
s3, placing the casting sheet on a roller, enabling the temperature of the roller contacted with the outer surface of the casting sheet to be 145 ℃ and the temperature of the roller contacted with the inner surface to be 110 ℃, preheating, longitudinally stretching to obtain a thick sheet under the conditions that the temperature is 122 ℃ and the stretching ratio is 3.7 times, preheating the thick sheet at 178 ℃, transversely stretching under the conditions that the temperature is 150 ℃ and the stretching ratio is 8.2 times, then performing heat setting at 172 ℃, retracting, and obtaining a film with the retraction ratio of 2.5%;
and S4, cooling the film prepared in the step S3 by air at 25 ℃, cooling and flattening the film in a traction system at 25 ℃, rolling the film, wherein the rolling cutting depth is-3.5 mm, and cutting and packaging the film after aging treatment to prepare a finished product.
The performance indexes of the precoated base film prepared above are shown in table 1:
table 1 results of performance index test of precoated base film of example 1
Example 2
The anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film sequentially comprises an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer;
the outer surface layer is prepared from the following raw materials in percentage by mass: 3% of antistatic master batch, 10% of ultra-smooth polypropylene anti-sticking master batch, 18% of carbon nanotube modified polypropylene composite material, 20% of glass fiber reinforced modified polypropylene and 49% of maleic anhydride graft modified homo-polypropylene;
the outer subsurface layer is prepared from the following raw materials in percentage by mass: 20% of ethylene-propylene-ethylene glycol block copolymer, 20% of maleic anhydride grafted homo-polypropylene and 60% of polyvinyl alcohol;
the core layer is prepared from the following raw materials in percentage by mass: 3% of metallocene linear low-density polyethylene, 15% of ethylene-propylene-butadiene terpolymer, 10% of maleic anhydride graft modified homo-polypropylene and 72% of polypropylene;
the inner surface layer is prepared from the following raw materials in percentage by mass: 5% of an ultralow-friction anti-sticking master batch, 5% of maleic anhydride graft modified homo-polypropylene, 2% of low-density polyethylene, 3% of an ethylene-propylene-butadiene terpolymer and 85% of metallocene linear low-density polyethylene.
Wherein, the thickness of the outer surface layer is 7 μm, the thickness of the outer sub-surface layer is 5 μm, the thickness of the inner surface layer is 3 μm, and the total thickness of the precoating basement membrane is 35 μm.
Preparing a precoated base film:
s1, adding the raw materials of the core layer into a double-screw extruder, heating and melting at 242 ℃, removing water vapor and small molecular impurities in the raw materials by using a vacuum filtration system under the condition that the vacuum negative pressure is 1.2mPa, and filtering by using a 400-mesh candle filter to obtain a core layer melt; respectively adding the raw material of the outer surface layer, the raw material of the outer subsurface layer and the raw material of the inner surface layer into three twin-screw extruders for heating and melting, and respectively filtering by using a 300-mesh flat filter to obtain an outer surface layer melt, an outer subsurface layer melt and an inner surface layer melt; converging and extruding the core layer melt, the outer surface layer melt, the outer subsurface layer melt and the inner surface layer melt in a four-layer structure die head in sequence to form a melt sheet, wherein the opening degree of a die lip of the die head is 2.5 mm;
s2, attaching the melt sheet to a chill roll at 30 ℃ to form a cast sheet through cooling;
s3, placing the casting sheet on a roller, enabling the temperature of the roller contacted with the outer surface of the casting sheet to be 140 ℃ and the temperature of the roller contacted with the inner surface to be 115 ℃, preheating, longitudinally stretching to obtain a thick sheet under the conditions that the temperature is 128 ℃ and the stretching ratio is 3.6 times, preheating the thick sheet under the condition of 179 ℃, transversely stretching under the conditions that the temperature is 155 ℃ and the stretching ratio is 8.5 times, then performing heat setting under the condition of 175 ℃, retracting, and obtaining a film, wherein the retraction ratio is 2.0%;
and S4, cooling the film prepared in the step S3 by air at 23 ℃, cooling and flattening the film in a traction system at 23 ℃, rolling the film, wherein the rolling cut depth is-3.0 mm, and cutting and packaging the film to prepare a finished product after aging treatment.
The performance indexes of the precoated base film prepared above are shown in table 2:
table 2 results of performance index test of precoated base film of example 2
Example 3
The anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film sequentially comprises an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer;
the outer surface layer is prepared from the following raw materials in percentage by mass: 1% of antistatic master batch, 1% of ultra-smooth polypropylene anti-sticking master batch, 10% of carbon nanotube modified polypropylene composite material, 10% of glass fiber reinforced modified polypropylene and 78% of maleic anhydride graft modified homo-polypropylene;
the outer subsurface layer is prepared from the following raw materials in percentage by mass: 10% of ethylene-propylene-ethylene glycol block copolymer, 10% of maleic anhydride grafted homo-polypropylene and 80% of polyvinyl alcohol;
the core layer is prepared from the following raw materials in percentage by mass: 1% of metallocene linear low-density polyethylene, 1% of ethylene-propylene-butadiene terpolymer, 10% of maleic anhydride graft modified homo-polypropylene and 88% of polypropylene;
the inner surface layer is prepared from the following raw materials in percentage by mass: 1% of ultralow-friction anti-sticking master batch, 1% of maleic anhydride graft modified homo-polypropylene, 1% of low-density polyethylene, 1% of ethylene-propylene-butadiene terpolymer and 96% of metallocene linear low-density polyethylene.
Wherein, the thickness of the outer surface layer is 5 μm, the thickness of the outer sub-surface layer is 10 μm, the thickness of the inner surface layer is 5 μm, and the total thickness of the precoating basement membrane is 35 μm.
Preparing a precoated base film:
s1, adding the raw materials of the core layer into a double-screw extruder, heating and melting at 230 ℃, removing water vapor and small molecular impurities in the raw materials by using a vacuum filtration system under the condition that the vacuum negative pressure is 0.2mPa, and filtering by using a 360-mesh candle filter to obtain a core layer melt; respectively adding the raw material of the outer surface layer, the raw material of the outer subsurface layer and the raw material of the inner surface layer into three twin-screw extruders for heating and melting, and respectively filtering by using a 300-mesh flat filter to obtain an outer surface layer melt, an outer subsurface layer melt and an inner surface layer melt; converging and extruding the core layer melt, the outer surface layer melt, the outer subsurface layer melt and the inner surface layer melt in a four-layer structure die head in sequence to form a melt sheet, wherein the opening degree of a die lip of the die head is 2.0 mm;
s2, attaching the melt sheet to a chill roll at 20 ℃ to form a cast sheet;
s3, placing the casting sheet on a roller, enabling the temperature of the roller contacted with the outer surface of the casting sheet to be 130 ℃, the temperature of the roller contacted with the inner surface to be 100 ℃, preheating, longitudinally stretching to obtain a thick sheet under the conditions that the temperature is 120 ℃ and the stretching ratio is 3.5 times, preheating the thick sheet at 165 ℃, transversely stretching under the conditions that the temperature is 140 ℃ and the stretching ratio is 7.5 times, heat setting at 165 ℃, retracting, and preparing a film, wherein the retraction ratio is 2.0%;
and S4, cooling the film prepared in the step S3 by air at 20 ℃, cooling and flattening the film in a traction system at 20 ℃, rolling the film, wherein the cutting depth is-1.0 mm, and cutting and packaging the film to prepare a finished product after aging treatment.
Example 4
The anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film sequentially comprises an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer;
the outer surface layer is prepared from the following raw materials in percentage by mass: 5% of antistatic master batch, 10% of ultra-smooth polypropylene anti-sticking master batch, 20% of carbon nanotube modified polypropylene composite material, 20% of glass fiber reinforced modified polypropylene and 45% of maleic anhydride graft modified homo-polypropylene;
the outer subsurface layer is prepared from the following raw materials in percentage by mass: 20% of ethylene-propylene-ethylene glycol block copolymer, 20% of maleic anhydride grafted homo-polypropylene and 60% of polyvinyl alcohol;
the core layer is prepared from the following raw materials in percentage by mass: 5% of metallocene linear low-density polyethylene, 15% of ethylene-propylene-butadiene terpolymer, 35% of maleic anhydride graft modified homo-polypropylene and 45% of polypropylene;
the inner surface layer is prepared from the following raw materials in percentage by mass: 10% of ultralow-friction anti-sticking master batch, 5% of maleic anhydride graft modified homo-polypropylene, 5% of low-density polyethylene, 5% of ethylene-propylene-butadiene terpolymer and 75% of metallocene linear low-density polyethylene.
Wherein, the thickness of the outer surface layer is 30 μm, the thickness of the outer sub-surface layer is 2 μm, the thickness of the inner surface layer is 0.5 μm, and the total thickness of the precoating basement membrane is 35 μm.
Preparing a precoated base film:
s1, adding the raw materials of the core layer into a double-screw extruder, heating and melting at 255 ℃, removing water vapor and small molecular impurities in the raw materials under the condition that the vacuum negative pressure is 1.2mPa by using a vacuum filtration system, and filtering by using a 380-mesh candle filter to obtain a core layer melt; respectively adding the raw material of the outer surface layer, the raw material of the outer subsurface layer and the raw material of the inner surface layer into three twin-screw extruders for heating and melting, and respectively filtering by using a 300-mesh flat filter to obtain an outer surface layer melt, an outer subsurface layer melt and an inner surface layer melt; converging and extruding the core layer melt, the outer surface layer melt, the outer subsurface layer melt and the inner surface layer melt in a four-layer structure die head in sequence to form a melt sheet, wherein the opening degree of a die lip of the die head is 4.5 mm;
s2, attaching the melt sheet to a chill roll at 40 ℃ to form a cast sheet;
s3, placing the casting sheet on a roller, enabling the temperature of the roller contacted with the outer surface of the casting sheet to be 150 ℃ and the temperature of the roller contacted with the inner surface to be 120 ℃, preheating, longitudinally stretching to obtain a thick sheet under the conditions that the temperature is 135 ℃ and the stretching ratio is 4.2 times, preheating the thick sheet at 180 ℃, transversely stretching under the conditions that the temperature is 160 ℃ and the stretching ratio is 9.0 times, then performing heat setting at 175 ℃, retracting, and obtaining a thin film, wherein the shrinking ratio is 5.0%;
and S4, cooling the film prepared in the step S3 by air at 35 ℃, cooling and flattening the film in a traction system at 30 ℃, rolling the film, wherein the rolling cutting depth is-5.0 mm, and cutting and packaging the film after aging treatment to prepare a finished product.
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 scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film is characterized by sequentially comprising an outer surface layer, an outer secondary surface layer, a core layer and an inner surface layer;
the outer surface layer is prepared from the following raw materials in percentage by mass: 1-5% of antistatic master batch, 1-10% of ultra-smooth polypropylene anti-sticking master batch, 10-20% of carbon nanotube modified polypropylene composite material, 10-20% of glass fiber reinforced modified polypropylene and the balance of maleic anhydride graft modified homo-polypropylene;
the outer subsurface layer is prepared from the following raw materials in percentage by mass: 10-20% of ethylene-propylene-ethylene glycol block copolymer, 10-20% of maleic anhydride grafted homo-polypropylene and the balance of polyvinyl alcohol;
the core layer is prepared from the following raw materials in percentage by mass: 1-5% of metallocene linear low-density polyethylene, 1-15% of ethylene-propylene-butadiene terpolymer, 10-35% of maleic anhydride graft modified homo-polypropylene and the balance of polypropylene;
the inner surface layer is prepared from the following raw materials in percentage by mass: 1-10% of an ultralow-friction anti-sticking master batch, 1-5% of maleic anhydride graft modified homo-polypropylene, 1-5% of low-density polyethylene, 1-5% of an ethylene-propylene-butadiene terpolymer and the balance of metallocene linear low-density polyethylene.
2. The anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film according to claim 1, wherein the ethylene-propylene-ethylene glycol block copolymer is prepared by taking an ethylene-propylene random copolymer with an ethylene chain segment proportion of 5-20% as a raw material to prepare a hydroxyl-terminated ethylene-propylene random copolymer, and then mixing the isocyanate-terminated polyethylene glycol and the hydroxyl-terminated ethylene-propylene random copolymer according to a mass ratio of (10-40): (60-90) mixing and reacting.
3. The anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film according to claim 1 or 2, wherein the super-smooth polypropylene anti-sticking master batch is prepared by adding anti-sticking particles in the polymerization reaction process of propylene synthetic polypropylene, and the super-smooth polypropylene anti-sticking master batch comprises the following components in percentage by mass: 3-8% of anti-adhesion particles and the balance of isotactic polypropylene; preferably, the anti-blocking particles are organic porous glass microspheres with the particle size distribution of 2.5-7.8 μm and the average particle size of 5.2 μm.
4. The scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film and the preparation method thereof as claimed in any one of claims 1 to 3, wherein the carbon nanotube modified polypropylene composite material is prepared from the following raw materials in parts by weight: 40-60 parts of isotactic polypropylene, 10-20 parts of ethylene propylene random copolymer, 10-30 parts of carbon nanotube master batch, 4-8 parts of modified graphene, 10-20 parts of dispersing agent and 10-20 parts of compatilizer; preferably, the carbon nanotube master batch contains 15-25 wt% of carbon nanotubes.
5. The scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film and the preparation method thereof as claimed in any one of claims 1 to 4, wherein the ultra-low friction anti-sticking master batch is prepared by adding anti-sticking particles and a dispersing agent in the copolymerization polymerization process of synthesizing metallocene linear low density polyethylene, and the ultra-low friction anti-sticking master batch comprises the following components in percentage by mass: 1.5-2.8% of anti-adhesion particles, 0.5-1.9% of dispersing agent and the balance of metallocene linear low density polyethylene; preferably, the anti-blocking particles are spherical porous silica with the particle size distribution of 2.0-10.0 μm and the average particle size of 5.0 μm.
6. The scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film according to any one of claims 1 to 5, wherein the thickness of the outer surface layer is 5 to 30 μm, the thickness of the outer sub-surface layer is 2 to 10 μm, and the thickness of the inner surface layer is 0.5 to 5.0 μm.
7. The preparation method of the scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
s1, heating and melting the raw materials of the outer surface layer, the outer subsurface layer, the core layer and the inner surface layer respectively, filtering respectively to obtain an outer surface layer melt, an outer subsurface layer melt, a core layer melt and an inner surface layer melt, and converging and extruding the outer surface layer melt, the outer subsurface layer melt, the core layer melt and the inner surface layer melt in a four-layer structure die head in sequence to form a melt sheet;
s2, attaching the melt sheet to a chill roll to form a cast sheet;
and S3, longitudinally stretching the casting sheet to obtain a thick sheet, and transversely stretching the thick sheet to obtain a thin film.
8. The preparation method of the anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film according to claim 7, wherein the preheating temperature of longitudinal stretching is 100-150 ℃, the stretching temperature is 120-135 ℃, and the stretching ratio is 3.5-4.2, wherein the preheating of longitudinal stretching is to place the casting sheet on a roller, the temperature of the roller in contact with the outer surface of the casting sheet is 130-150 ℃, and the temperature of the roller in contact with the inner surface of the casting sheet is 100-120 ℃; the preheating temperature of transverse stretching is 165-180 ℃, the stretching temperature is 140-160 ℃, the heat setting temperature is 165-175 ℃, the stretching ratio is 7.5-9.0 times, and the retraction ratio is 2.0-5.0%.
9. The preparation method of the anti-scratching high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film according to claim 7 or 8, wherein the core layer melt is filtered by a 360-400-mesh filter, the outer surface layer melt, the outer sub-surface layer melt and the inner surface layer melt are respectively filtered by a 300-mesh filter, and the opening of a die lip of the die head is 2.0-4.5 mm.
10. The preparation method of the scratch-resistant high-barrier primer-free multilayer co-extrusion BOPP pre-coated base film according to any one of claims 7 to 9, wherein the temperature of the chill roll is 20-40 ℃.
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| CN105623097A (en) * | 2016-03-02 | 2016-06-01 | 北京航天试验技术研究所 | Nanometer-material-compounded long-glass-fiber-reinforced polypropylene material and preparing method thereof |
| CN105906839A (en) * | 2016-04-19 | 2016-08-31 | 广州赫尔普化工有限公司 | Silicon dioxide-based anti-adhesion agent used for polyolefin thin film and preparation method thereof |
| CN109233105A (en) * | 2018-09-25 | 2019-01-18 | 宁波瑞成包装材料有限公司 | A kind of production method of stretch-proof high barrier polypropylene screen |
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