CN110696461A - High-heat-seal-strength puncture-resistant BOPP film and preparation method thereof - Google Patents
High-heat-seal-strength puncture-resistant BOPP film and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-heat-seal-strength puncture-resistant BOPP film which sequentially comprises a corona layer, a core layer and a heat seal layer; the raw materials of the corona layer consist of 95-98 parts of homopolymerized polypropylene and 2-5 parts of anti-sticking master batch by weight; the raw materials of the anti-sticking master batch A consist of 30-50 parts of random silicon dioxide and 50-70 parts of homopolymerized polypropylene according to parts by weight; the core layer is prepared from 80-85 parts by weight of homopolymerized polypropylene, 1-5 parts by weight of erucamide slipping agent and 10-15 parts by weight of SBS styrene thermoplastic elastomer; the raw materials of the heat sealing layer consist of 70-80 parts of metallocene ternary copolymer polypropylene, 20-25 parts of linear low-density polyethylene and 2-6 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B comprise 40-60 parts of glass beads and 40-60 parts of binary copolymerized polypropylene in parts by weight. The invention also discloses a preparation method of the BOPP film.
Description
Technical Field
The invention relates to the technical field of BOPP films, in particular to a high-heat-seal-strength puncture-resistant BOPP film and a preparation method thereof.
Background
In the field of packaging of foods and medicines, particularly heavy objects and hard objects, the traditional packaging film is difficult to meet the requirements of high-strength heat sealing and puncture resistance. At present, most of common packages in the market are: the packaging bag has the following structures of OPP/LLDPE, NY/LLDPE, PET/CPP, PET/VMPET/CPP, PET/NY/CPP and the like, and has the following problems: (1) the impact resistance of the packaging bag is poor, the packaging bag is easily damaged by external force in the processes of transportation, loading and unloading and shelf placement, the phenomena of bag breaking and bag opening are easily caused, the appearance of a packaged product is influenced, and the due effect of the packaging bag cannot be achieved; (2) the smoothness of the packaging bag is poor, the opening performance is poor in the production process, the production efficiency is low, the utilization rate of the packaging bag is reduced, and the cost is wasted; (3) the heat seal strength of a common packaging bag is less than 20N/15mm, when the heat seal temperature is too high, the damage of a heat seal layer is easily caused, the protection performance of the packaging bag is reduced, the quality guarantee period of contents is greatly shortened, and the contents cannot reach the corresponding quality guarantee period; (4) the interlaminar peeling strength of the packaging bag is less than 1.0N/15mm, so that the breaking force is insufficient, the mechanical property of the packaging bag is poor, the packaging bag is layered, the packaging bag cannot achieve the due bearing effect, and the effective protection effect on the contents cannot be achieved; (5) the puncture performance of the packaging bag is less than 1.0N/mu m, and for fish and meat products containing bones and hard objects, the packaging bag is easy to puncture by product extrusion in transportation and stacking, the sealing performance of the packaging bag is damaged, and thus the puncture performance requirement on the packaging bag is high; (6) the composite processing process of the packaging material involves solvent and glue, has certain pollution to the environment and does not accord with the policy of green packaging industry.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a high-heat-seal-strength puncture-resistant BOPP film and a preparation method thereof.
The invention provides a high-heat-seal-strength puncture-resistant BOPP film which is sequentially composed of a corona layer, a core layer and a heat seal layer; the raw materials of the corona layer consist of 95-98 parts of homopolymerized polypropylene and 2-5 parts of anti-sticking master batch A in parts by weight; the raw materials of the anti-sticking master batch A consist of 30-50 parts of random silicon dioxide and 50-70 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 80-85 parts by weight of homopolymerized polypropylene, 1-5 parts by weight of erucamide slipping agent and 10-15 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 70-80 parts of metallocene ternary copolymer polypropylene, 20-25 parts of linear low-density polyethylene and 2-6 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B comprise 40-60 parts of glass beads and 40-60 parts of binary copolymerized polypropylene in parts by weight.
Preferably, the thickness of the corona layer is 4-8% of the thickness of the BOPP film, the thickness of the core layer is 75-80% of the thickness of the BOPP film, and the thickness of the heat sealing layer is 15-20% of the thickness of the BOPP film.
Preferably, the melt index of the homopolypropylene is from 2.5 to 3.5g/10 min.
Preferably, the random silica has two particle size ranges of 1-2 μm and 2-4 μm, wherein the weight ratio of the random silica having a particle size of 1-2 μm to the random silica having a particle size of 2-4 μm is 0.5-1.5: 3.5-4.5.
Preferably, the glass microspheres have a particle size of 2-4 μm.
Preferably, the high heat seal strength puncture resistant BOPP film has a thickness of 20-50 μm.
The invention also provides a preparation method of the high heat-seal-strength puncture-resistant BOPP film, which comprises the following steps:
s1, extruding, plasticizing and melting the core layer raw materials to obtain a core layer melt; heating and melting a corona layer raw material to obtain a corona layer melt; heating and melting the heat seal layer raw material to obtain a heat seal layer melt;
s2, respectively filtering the corona layer melt, the core layer melt and the heat seal layer melt, converging and extruding the melts at a lip of a three-layer die head to form a membrane, attaching the membrane to a chill roll by a high-pressure air knife to be quenched to form a cast sheet, and cooling and shaping the cast sheet by circulating cooling water;
s3, longitudinally stretching the casting sheet to obtain a thick film, transversely stretching, heat setting, and naturally cooling to room temperature to obtain the puncture-resistant BOPP film with high heat-seal strength, wherein during longitudinal stretching, the preheating temperature of the corona layer is 150-.
Preferably, in S3, the preheating temperature for transverse stretching is 175-180 ℃, the transverse stretching temperature is 155-160 ℃, and the transverse stretching multiple is 8-10 times.
Preferably, in S3, the heat-setting temperature is 165-170 ℃.
Preferably, in S2, the screen is 400 mesh and the pressure of the high pressure air knife is 260 bar.
And in the step S3, introducing the high-heat-seal-strength puncture-resistant BOPP film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
The core layer of the invention adopts the homopolymerized polypropylene, the erucamide slipping agent and the SBS styrene thermoplastic elastomer, thereby improving the impact resistance, puncture resistance and opening effect of the film; the anti-adhesion master batch A for shallow screen printing with smaller granularity is selected for the corona layer, so that the film printing applicability is strong, and the printing problems of point loss, poor overprinting and the like can be avoided; the heat sealing layer adopts metallocene ternary copolymer polypropylene, linear low-density polyethylene and anti-sticking master batch B, so that the BOPP film has good heat sealing performance and lower initial heat sealing temperature; the invention provides a proper preparation method according to the BOPP film, and the corona layer and the heat-sealing layer are preheated at different temperatures during longitudinal stretching so as to prevent the heat-sealing layer from being stuck on a roller; the BOPP film can also be suitable for the production line of common BOPP films.
The heat sealing strength of the invention can reach more than 20N/15mm, the pendulum impact resistance (strength) can be more than or equal to 1.0J, and the friction coefficient is less than or equal to 0.3; the puncture resistance is more than or equal to 1.5N/mum, the invention can replace part of PE or CPP composite package, and has wide market prospect.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A high heat-seal strength puncture-resistant BOPP film comprises a corona layer, a core layer and a heat-seal layer in sequence; the raw materials of the corona layer consist of 95 parts of homopolymerized polypropylene and 5 parts of anti-sticking master batch A in parts by weight; the raw materials of the anti-sticking master batch A consist of 30 parts of random silicon dioxide and 70 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 80 parts by weight of homopolymerized polypropylene, 5 parts by weight of erucamide slipping agent and 15 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 70 parts of metallocene ternary copolymer polypropylene, 25 parts of linear low-density polyethylene and 5 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B consist of 40 parts of glass beads and 60 parts of binary copolymerized polypropylene in parts by weight;
the thickness of the high heat-seal strength puncture-resistant BOPP film is 20 mu m;
the thickness of the corona layer is 4% of that of the BOPP film, the thickness of the core layer is 80% of that of the BOPP film, and the thickness of the heat-seal layer is 16% of that of the BOPP film;
the melt index of the homopolymerized polypropylene is 2.5g/10 min; the particle size of the random silica is 1 μm and 2 μm, wherein the weight ratio of the random silica with the particle size of 1 μm to the random silica with the particle size of 2 μm is 0.5: 4.5; the particle size of the glass beads was 2 μm.
The preparation method of the high heat-seal-strength puncture-resistant BOPP film comprises the following steps:
s1, adding the core layer raw materials into a main extruder, extruding, plasticizing and melting to obtain a core layer melt; adding a corona layer raw material into an auxiliary extruder, and heating and melting to obtain a corona layer melt; adding the raw material of the heat seal layer into another auxiliary extruder, and heating and melting to obtain a melt of the heat seal layer;
s2, filtering the corona layer melt, the core layer melt and the heat seal layer melt through 400-mesh filter screens respectively, converging at a lip of a three-layer die head to extrude into a membrane, attaching the membrane to a chill roll by a 260bar high-pressure air knife to quench to form a cast sheet, and cooling and shaping by circulating cooling water;
s3, taking a casting sheet, enabling the preheating temperature of the corona layer to be 120 ℃, the preheating temperature of the heat sealing layer to be 90 ℃, longitudinally stretching 4.0 times at 110 ℃ to obtain a thick film, taking the thick film, preheating at 175 ℃, transversely stretching 8 times at 155 ℃, heat setting at 165 ℃, naturally cooling to room temperature to obtain a high-heat-seal-strength puncture-resistant BOPP film, introducing the high-heat-seal-strength puncture-resistant BOPP film into a traction system, flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Example 2
A high heat-seal strength puncture-resistant BOPP film comprises a corona layer, a core layer and a heat-seal layer in sequence; the raw materials of the corona layer consist of 96 parts of homopolymerized polypropylene and 4 parts of anti-sticking master batch A in parts by weight; the raw materials of the anti-sticking master batch A consist of 40 parts of random silicon dioxide and 60 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 81 parts by weight of homopolymerized polypropylene, 4 parts by weight of erucamide slipping agent and 15 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 72 parts of metallocene ternary copolymer polypropylene, 24 parts of linear low-density polyethylene and 4 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B consist of 50 parts of glass beads and 50 parts of binary copolymerized polypropylene in parts by weight;
the thickness of the high heat-seal strength puncture-resistant BOPP film is 30 micrometers;
the thickness of the corona layer is 5% of that of the BOPP film, the thickness of the core layer is 78% of that of the BOPP film, and the thickness of the heat-seal layer is 17% of that of the BOPP film;
the melt index of the homopolymerized polypropylene is 2.7g/10 min; the particle size of the random silica is 2 μm and 4 μm, wherein the weight ratio of the random silica with the particle size of 2 μm to the random silica with the particle size of 4 μm is 1.5: 3.5; the particle size of the glass beads was 3 μm.
The preparation method of the high heat-seal-strength puncture-resistant BOPP film comprises the following steps:
s1, adding the core layer raw materials into a main extruder, extruding, plasticizing and melting to obtain a core layer melt; adding a corona layer raw material into an auxiliary extruder, and heating and melting to obtain a corona layer melt; adding the raw material of the heat seal layer into another auxiliary extruder, and heating and melting to obtain a melt of the heat seal layer;
s2, filtering the corona layer melt, the core layer melt and the heat seal layer melt through 400-mesh filter screens respectively, converging at a lip of a three-layer die head to extrude into a membrane, attaching the membrane to a chill roll by a 260bar high-pressure air knife to quench to form a cast sheet, and cooling and shaping by circulating cooling water;
s3, taking a casting sheet, enabling the preheating temperature of the corona layer to be 130 ℃, the preheating temperature of the heat sealing layer to be 95 ℃, longitudinally stretching the thick film by 4.2 times at 115 ℃ to obtain a thick film, taking the thick film, preheating the thick film at 176 ℃, transversely stretching the thick film by 9 times at 156 ℃, heat setting the thick film at 166 ℃, naturally cooling the thick film to room temperature to obtain a high-heat-seal-strength puncture-resistant BOPP film, introducing the high-heat-seal-strength puncture-resistant BOPP film into a traction system, flattening the film, measuring the thickness by a beta-ray thickness gauge, and rolling the film to obtain.
Example 3
A high heat-seal strength puncture-resistant BOPP film comprises a corona layer, a core layer and a heat-seal layer in sequence; the raw materials of the corona layer consist of 97 parts by weight of homopolymerized polypropylene and 3 parts by weight of anti-sticking master batch A; the raw materials of the anti-sticking master batch A consist of 50 parts of random silicon dioxide and 50 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 82 parts by weight of homopolymerized polypropylene, 4 parts by weight of erucamide slipping agent and 14 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 74 parts of metallocene ternary copolymer polypropylene, 23 parts of linear low-density polyethylene and 3 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B consist of 60 parts of glass beads and 40 parts of binary copolymerized polypropylene in parts by weight;
the thickness of the high heat-seal strength puncture-resistant BOPP film is 40 mu m;
the thickness of the corona layer is 6% of that of the BOPP film, the thickness of the core layer is 76% of that of the BOPP film, and the thickness of the heat-seal layer is 18% of that of the BOPP film;
the melt index of the homopolymerized polypropylene is 2.9g/10 min; the particle size of the random silica is 1.5 μm and 3 μm, wherein the weight ratio of the random silica with the particle size of 1.5 μm to the random silica with the particle size of 3 μm is 1: 4; the particle size of the glass beads was 4 μm.
The preparation method of the high heat-seal-strength puncture-resistant BOPP film comprises the following steps:
s1, adding the core layer raw materials into a main extruder, extruding, plasticizing and melting to obtain a core layer melt; adding a corona layer raw material into an auxiliary extruder, and heating and melting to obtain a corona layer melt; adding the raw material of the heat seal layer into another auxiliary extruder, and heating and melting to obtain a melt of the heat seal layer;
s2, filtering the corona layer melt, the core layer melt and the heat seal layer melt through 400-mesh filter screens respectively, converging at a lip of a three-layer die head to extrude into a membrane, attaching the membrane to a chill roll by a 260bar high-pressure air knife to quench to form a cast sheet, and cooling and shaping by circulating cooling water;
s3, taking a casting sheet, enabling the preheating temperature of the corona layer to be 140 ℃, the preheating temperature of the heat sealing layer to be 100 ℃, longitudinally stretching the thick film by 4.4 times at 120 ℃ to obtain a thick film, preheating the thick film at 177 ℃, transversely stretching the thick film by 9 times at 157 ℃, heat setting the thick film at 167 ℃, naturally cooling the thick film to room temperature to obtain a high-heat-seal-strength puncture-resistant BOPP film, introducing the high-heat-seal-strength puncture-resistant BOPP film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Example 4
A high heat-seal strength puncture-resistant BOPP film comprises a corona layer, a core layer and a heat-seal layer in sequence; the raw materials of the corona layer consist of 98 parts of homopolymerized polypropylene and 2 parts of anti-sticking master batch A in parts by weight; the raw materials of the anti-sticking master batch A consist of 40 parts of random silicon dioxide and 60 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 83 parts by weight of homopolymerized polypropylene, 4 parts by weight of erucamide slipping agent and 13 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 76 parts of metallocene ternary copolymer polypropylene, 22 parts of linear low-density polyethylene and 2 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B consist of 50 parts of glass beads and 50 parts of binary copolymerized polypropylene in parts by weight;
the thickness of the high heat-seal strength puncture-resistant BOPP film is 50 mu m;
the thickness of the corona layer is 7% of that of the BOPP film, the thickness of the core layer is 75% of that of the BOPP film, and the thickness of the heat-seal layer is 18% of that of the BOPP film;
the melt index of the homopolymerized polypropylene is 3.1g/10 min; the particle size of the random silica is 2 μm and 4 μm, wherein the weight ratio of the random silica with the particle size of 2 μm to the random silica with the particle size of 4 μm is 1.5: 3.5; the particle size of the glass beads was 3 μm.
The preparation method of the high heat-seal-strength puncture-resistant BOPP film comprises the following steps:
s1, adding the core layer raw materials into a main extruder, extruding, plasticizing and melting to obtain a core layer melt; adding a corona layer raw material into an auxiliary extruder, and heating and melting to obtain a corona layer melt; adding the raw material of the heat seal layer into another auxiliary extruder, and heating and melting to obtain a melt of the heat seal layer;
s2, filtering the corona layer melt, the core layer melt and the heat seal layer melt through 400-mesh filter screens respectively, converging at a lip of a three-layer die head to extrude into a membrane, attaching the membrane to a chill roll by a 260bar high-pressure air knife to quench to form a cast sheet, and cooling and shaping by circulating cooling water;
s3, taking a casting sheet, enabling the preheating temperature of the corona layer to be 150 ℃, the preheating temperature of the heat sealing layer to be 105 ℃, longitudinally stretching the thick film by 4.7 times at 125 ℃ to obtain a thick film, preheating the thick film at 178 ℃, transversely stretching the thick film by 10 times at 158 ℃, heat setting the thick film at 168 ℃, naturally cooling the thick film to room temperature to obtain a high-heat-seal-strength puncture-resistant BOPP film, introducing the high-heat-seal-strength puncture-resistant BOPP film into a traction system for flattening, measuring the thickness by a beta-ray thickness gauge, and rolling to obtain a finished product.
Example 5
A high heat-seal strength puncture-resistant BOPP film comprises a corona layer, a core layer and a heat-seal layer in sequence; the raw materials of the corona layer consist of 97 parts by weight of homopolymerized polypropylene and 3 parts by weight of anti-sticking master batch A; the raw materials of the anti-sticking master batch A consist of 30 parts of random silicon dioxide and 70 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 84 parts by weight of homopolymerized polypropylene, 2 parts by weight of erucamide slipping agent and 14 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 78 parts of metallocene ternary copolymer polypropylene, 20 parts of linear low-density polyethylene and 2 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B consist of 40 parts of glass beads and 60 parts of binary copolymerized polypropylene in parts by weight;
the thickness of the high heat-seal strength puncture-resistant BOPP film is 40 mu m;
the thickness of the corona layer is 8% of that of the BOPP film, the thickness of the core layer is 77% of that of the BOPP film, and the thickness of the heat-seal layer is 15% of that of the BOPP film;
the melt index of the homopolymerized polypropylene is 3.3g/10 min; the particle size of the random silica is 1 μm and 2 μm, wherein the weight ratio of the random silica with the particle size of 1 μm to the random silica with the particle size of 2 μm is 0.5: 4.5; the particle size of the glass beads was 3 μm.
The preparation method of the high heat-seal-strength puncture-resistant BOPP film comprises the following steps:
s1, adding the core layer raw materials into a main extruder, extruding, plasticizing and melting to obtain a core layer melt; adding a corona layer raw material into an auxiliary extruder, and heating and melting to obtain a corona layer melt; adding the raw material of the heat seal layer into another auxiliary extruder, and heating and melting to obtain a melt of the heat seal layer;
s2, filtering the corona layer melt, the core layer melt and the heat seal layer melt through 400-mesh filter screens respectively, converging at a lip of a three-layer die head to extrude into a membrane, attaching the membrane to a chill roll by a 260bar high-pressure air knife to quench to form a cast sheet, and cooling and shaping by circulating cooling water;
s3, taking a casting sheet, enabling the preheating temperature of the corona layer to be 140 ℃, the preheating temperature of the heat-sealing layer to be 110 ℃, longitudinally stretching the thick film by 4.9 times at 130 ℃ to obtain a thick film, taking the thick film, preheating the thick film at 179 ℃, transversely stretching the thick film by 9 times at 158 ℃, heat-setting the thick film at 169 ℃, naturally cooling the thick film to room temperature to obtain a high-heat-seal-strength puncture-resistant BOPP film, introducing the high-heat-seal-strength puncture-resistant BOPP film into a traction system, flattening the film, measuring the thickness by a beta-ray thickness gauge, and rolling the film.
Example 6
A high heat-seal strength puncture-resistant BOPP film comprises a corona layer, a core layer and a heat-seal layer in sequence; the raw materials of the corona layer consist of 96 parts of homopolymerized polypropylene and 4 parts of anti-sticking master batch A in parts by weight; the raw materials of the anti-sticking master batch A consist of 40 parts of random silicon dioxide and 60 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 85 parts by weight of homopolymerized polypropylene, 1 part by weight of erucamide slipping agent and 14 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 78 parts of metallocene ternary copolymer polypropylene, 20 parts of linear low-density polyethylene and 2 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B consist of 50 parts of glass beads and 50 parts of binary copolymerized polypropylene in parts by weight;
the thickness of the high heat-seal strength puncture-resistant BOPP film is 50 mu m;
the thickness of the corona layer is 5% of that of the BOPP film, the thickness of the core layer is 75% of that of the BOPP film, and the thickness of the heat-seal layer is 20% of that of the BOPP film;
the melt index of the homopolymerized polypropylene is 3.5g/10 min; the particle size of the random silica is 1.5 μm and 3 μm, wherein the weight ratio of the random silica with the particle size of 1.5 μm to the random silica with the particle size of 3 μm is 1: 4; the particle size of the glass beads was 2 μm.
The preparation method of the high heat-seal-strength puncture-resistant BOPP film comprises the following steps:
s1, adding the core layer raw materials into a main extruder, extruding, plasticizing and melting to obtain a core layer melt; adding a corona layer raw material into an auxiliary extruder, and heating and melting to obtain a corona layer melt; adding the raw material of the heat seal layer into another auxiliary extruder, and heating and melting to obtain a melt of the heat seal layer;
s2, filtering the corona layer melt, the core layer melt and the heat seal layer melt through 400-mesh filter screens respectively, converging at a lip of a three-layer die head to extrude into a membrane, attaching the membrane to a chill roll by a 260bar high-pressure air knife to quench to form a cast sheet, and cooling and shaping by circulating cooling water;
s3, taking a casting sheet, enabling the preheating temperature of the corona layer to be 150 ℃, the preheating temperature of the heat sealing layer to be 110 ℃, longitudinally stretching the thick film by 5.0 times at 130 ℃ to obtain a thick film, taking the thick film, preheating the thick film at 180 ℃, transversely stretching the thick film by 8 times at 160 ℃, heat setting the thick film at 170 ℃, naturally cooling the thick film to room temperature to obtain the high-heat-seal-strength puncture-resistant BOPP film, introducing the high-heat-seal-strength puncture-resistant BOPP film into a traction system, flattening the film, measuring the thickness by a beta-ray thickness gauge, and rolling the film to obtain.
The samples obtained in examples 1 to 6 were tested and the results are shown in the following table:
as can be seen from the above table, examples 1-6 have good pendulum impact resistance, heat seal strength, puncture resistance and low friction smoothness, are suitable for modern and rapid automatic packaging equipment, can replace part of composite products for heavy and hard object packaging, and have the advantages of cost and environmental protection.
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. A high heat-seal strength puncture-resistant BOPP film is characterized by sequentially comprising a corona layer, a core layer and a heat-seal layer; the raw materials of the corona layer consist of 95-98 parts of homopolymerized polypropylene and 2-5 parts of anti-sticking master batch by weight; the raw materials of the anti-sticking master batch A consist of 30-50 parts of random silicon dioxide and 50-70 parts of homopolymerized polypropylene according to parts by weight;
the core layer is prepared from 80-85 parts by weight of homopolymerized polypropylene, 1-5 parts by weight of erucamide slipping agent and 10-15 parts by weight of SBS styrene thermoplastic elastomer;
the raw materials of the heat sealing layer consist of 70-80 parts of metallocene ternary copolymer polypropylene, 20-25 parts of linear low-density polyethylene and 2-6 parts of anti-sticking master batch B in parts by weight; the raw materials of the anti-sticking master batch B comprise 40-60 parts of glass beads and 40-60 parts of binary copolymerized polypropylene in parts by weight.
2. The high heat seal strength puncture resistant BOPP film according to claim 1, wherein the corona layer has a thickness of 4 to 8% of the thickness of the BOPP film, the core layer has a thickness of 75 to 80% of the thickness of the BOPP film, and the heat seal layer has a thickness of 15 to 20% of the thickness of the BOPP film.
3. The high heat seal strength puncture resistant BOPP film according to claim 1 or 2, wherein the melt index of the homo-polypropylene is 2.5 to 3.5g/10 min.
4. The high heat-seal strength puncture-resistant BOPP film according to any one of claims 1 to 3, wherein the random silica has two particle size ranges, the particle size ranges are 1 to 2 μm and 2 to 4 μm, and the weight ratio of the random silica having the particle size of 1 to 2 μm to the random silica having the particle size of 2 to 4 μm is 0.5 to 1.5: 3.5-4.5.
5. The high heat seal strength puncture resistant BOPP film according to any one of claims 1 to 4, wherein the glass beads have a particle size of 2 to 4 μm.
6. The high heat seal strength puncture resistant BOPP film according to any one of claims 1 to 5, wherein the high heat seal strength puncture resistant BOPP film has a thickness of 20 to 50 μm.
7. A method for preparing the high heat seal strength puncture-resistant BOPP film according to any one of claims 1 to 6, which comprises the following steps:
s1, extruding, plasticizing and melting the core layer raw materials to obtain a core layer melt; heating and melting a corona layer raw material to obtain a corona layer melt; heating and melting the heat seal layer raw material to obtain a heat seal layer melt;
s2, respectively filtering the corona layer melt, the core layer melt and the heat seal layer melt, converging and extruding the melts at a lip of a three-layer die head to form a membrane, attaching the membrane to a chill roll by a high-pressure air knife to be quenched to form a cast sheet, and cooling and shaping the cast sheet by circulating cooling water;
s3, longitudinally stretching the casting sheet to obtain a thick film, transversely stretching, heat setting, and naturally cooling to room temperature to obtain the puncture-resistant BOPP film with high heat-seal strength, wherein during longitudinal stretching, the preheating temperature of the corona layer is 150-.
8. The method for preparing a puncture-resistant BOPP film with high heat-seal strength as claimed in claim 7, wherein in S3, the preheating temperature for transverse stretching is 175-180 ℃, the transverse stretching temperature is 155-160 ℃, and the transverse stretching multiple is 8-10.
9. The method for preparing a high heat-seal strength puncture-resistant BOPP film as claimed in claim 7 or 8, wherein the heat-setting temperature is 165-170 ℃ in S3.
10. The method for preparing a high heat-seal strength puncture-resistant BOPP film according to any one of claims 7 to 9, wherein in S2, the filter screen is 400 mesh and the pressure of the high-pressure air knife is 260 bar.
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