CN112026315B - Cast polypropylene peelable release film and preparation method thereof - Google Patents

Cast polypropylene peelable release film and preparation method thereof Download PDF

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Publication number
CN112026315B
CN112026315B CN202010674532.9A CN202010674532A CN112026315B CN 112026315 B CN112026315 B CN 112026315B CN 202010674532 A CN202010674532 A CN 202010674532A CN 112026315 B CN112026315 B CN 112026315B
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polypropylene
mass
release film
parts
layer
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CN112026315A (en
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谢文汇
王浩
杨勇
董文辉
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Huangshan Novel Co Ltd
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Huangshan Novel 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/026—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing of layered or coated substantially flat surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer

Abstract

The invention provides a cast polypropylene peelable release film and a preparation method thereof, belonging to the technical field of packaging. The release film is prepared from a cast polypropylene film and a release coating through an off-line hot pressing process; the cast polypropylene film is prepared by three layers of a corona layer, a middle layer and a heat sealing layer through co-extrusion casting, and the thickness ratio of the corona layer to the middle layer to the heat sealing layer is as follows: 3: 14: 3. According to the cast polypropylene peelable release film, deeper reticular lines and uniform depth distribution lines are obtained by an embossing process, so that the contact area with the pressure-sensitive adhesive can be reduced when the cast polypropylene peelable release film is attached to the pressure-sensitive adhesive, the contact surface is not an integral plane, bubbles generated when the release film with higher smoothness is attached to the pressure-sensitive adhesive can be avoided, and the use and appearance effects cannot be influenced; and the release effect of the release film is more stable.

Description

Cast polypropylene peelable release film and preparation method thereof
Technical Field
The invention relates to the field of packaging, in particular to a cast polypropylene peelable release film and a preparation method thereof.
Background
In order to increase the release force of the plastic film, silicone oil (silicone) is generally used as a release agent coated on the surface layer of the plastic film, so that the release film can exhibit a certain release force to various pressure-sensitive adhesives and has an anti-sticking release effect.
The release film is generally made of materials with high tensile strength and good heat resistance, such as BOPP, BOPET, paper and the like, and is used as a base material for coating silicone oil. When the traditional release film coated with the organic silicone oil is bonded with the pressure-sensitive adhesive, due to the fact that smoothness between the release film and the pressure-sensitive adhesive is high, bubbles are easily generated when the release film and the pressure-sensitive adhesive are bonded, the generated bubbles are difficult to remove, and the beautifying effect of the adhesive surface is affected; and the organic silicone oil is a mixture prepared from different raw materials, and cannot be used as a raw material for food packaging and medicine packaging with higher safety level.
Disclosure of Invention
In order to solve the technical problems, the invention provides a casting polypropylene peelable release film and a preparation method thereof, wherein the casting polypropylene peelable casting film has the advantages of no reverse adhesion, good unit length stability and the like; the preparation method has the characteristics of stable and uniform glue coating amount, accurate positioning of ring sealing and lap sealing and firm sealing strength.
In order to realize one of the purposes of the invention, the invention adopts the following technical scheme:
a casting polypropylene strippable release film is prepared by a casting polypropylene film through an off-line hot pressing process; the cast polypropylene film is prepared by three layers of a corona layer, a middle layer and a heat sealing layer through co-extrusion casting, and the thickness ratio of the corona layer to the middle layer to the heat sealing layer is 3: 14: 3.
Preferably, the corona layer comprises 90 to 110 parts by mass of polypropylene homopolyresin; the middle layer comprises 70-80 parts by mass of polypropylene homopolymerized resin and 23-27 parts by mass of ternary copolymerized polypropylene; the heat sealing layer comprises 70-80 parts by mass of polypropylene homopolymerization resin, 23-27 parts by mass of ternary polymerization polypropylene, 0.9-1.1 parts by mass of smooth master batch, 0.9-1.1 parts by mass of open master batch and 0.15-0.25 part by mass of processing aid.
Preferably, the corona layer includes 100 parts by mass of a polypropylene homo-polymer resin; the middle layer comprises 75 parts by mass of polypropylene homopolymerized resin and 25 parts by mass of ternary copolymer polypropylene; the heat sealing layer comprises 75 parts by mass of polypropylene homopolymerization resin, 25 parts by mass of ternary polymerization polypropylene, 1 part by mass of smooth master batch, 1 part by mass of opening master batch and 0.2 part by mass of processing aid.
Preferably, the grade of the polypropylene homopolymerization resin is HD915CF produced by northern Europe chemical industry Co; the grade of the ternary copolymer polypropylene is FL7632 produced by Singapore tpc company; the grade of the smooth master batch is 10090-K produced by color and safety companies; the grade of the opening master batch is AB20LD produced by Beijing Allen company; the processing aid is 100991-K produced by an Anhua color company.
Another object of the present invention is to provide a method for preparing a cast polypropylene peelable release film, comprising the steps of:
s1, weighing heat-sealing layer resin raw materials, middle layer resin raw materials and corona layer resin raw materials in corresponding parts by weight according to a formula, co-extruding, and cooling and shaping at a casting station;
s2, carrying out corona treatment on the surface of a corona layer of the film subjected to casting and shaping;
and S3, performing an off-line hot pressing process on the corona-treated film to obtain the release film, namely performing an embossing process after the film reaches a softening point through a heating roller.
Preferably, the thickness of the emboss after the embossing in the embossing process is at least one time the thickness of the emboss before the embossing.
Preferably, the temperatures of three barrels of the extruder are equally divided into three sections, and the temperatures of each section are respectively as follows: one section is 220 ℃, two sections are 255 ℃, three sections are 250 ℃, and the die head temperature of the extruder is 240 ℃.
Preferably, the roll surface temperature of the casting roll in the casting process in the step S1 is 15 ℃; the distance between the air knife and the cooling roller is 90CM; the air knife and the cooling roller form an angle of 45 degrees; the air knife pressure is 5mbar; the vacuum box pressure was 1mbar.
Preferably, the corona treatment power is 8KW and the corona roller pressure is 3bar.
Preferably, the reticulate patterns on the release film are in a plurality of rhombus splicing structures, the inner angles of the rhombuses are 60 degrees, the side lengths are 2mm, and the thickness of any one side is 0.4mm.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the prepared cast polypropylene peelable release film has deeper net-shaped grains and uniform depth distribution lines, when the release film is adhered to the pressure-sensitive adhesive, the contact area with the pressure-sensitive adhesive can be reduced, the contact surface is not an integral plane, bubbles generated when the release film with higher smoothness is adhered to the pressure-sensitive adhesive can be avoided, the use and appearance effects cannot be influenced, and the release effect of the release film is more stable.
2) The release film prepared by the invention does not adopt organic silicone oil as a release agent, and breaks through the tradition that the release film can not be prepared without organic silicone oil.
3) The cast polypropylene peelable release film is made of high-crystalline polypropylene homopolymerized resin and terpolymer, and is a film material manufactured by a casting process, for the release film, the proper high rigidity is favorable for the forming effect of a hot-pressing process and the stiffness of the hot-pressed film, so that the release effect of the release film is stabilized and improved, the brand of the polypropylene homopolymerized resin is HD915CF produced by northern Europe chemical company, the polypropylene homopolymerized resin is based on the northern star polymerization technology, and the high-crystalline polypropylene homopolymerized resin produced by adopting the unique northern star nucleation technology (BNT) can provide high rigidity for the structure of the release film, and is favorable for improving the stiffness and the heat resistance of the release film; the ternary copolymer polypropylene has good fluidity at the melting temperature, good molding property and two characteristics in processing: one is as follows: the viscosity of the melt is obviously reduced (less influenced by temperature) along with the increase of the shear speed; the second step is as follows: high molecular orientation degree, good processing temperature of about 200-300 ℃, good thermal stability (decomposition temperature of 310 ℃), obvious reduction of viscosity along with the increase of shearing speed, therefore, the fluidity of the alloy is improved by increasing the pressure and the speed, the shrinkage deformation and the dent are improved, and the melt can pass through a narrow die and has excellent processing performance. The performance characteristics of the ternary copolymer polypropylene can provide a better processing stability of the tape casting processing procedure for the invention. Therefore, the material has stable performance, high toughness, pressure resistance and processing stability under normal or high-temperature conditions.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a cross-sectional view of a release film after the embossing process of the present invention.
Fig. 3 is a schematic representation of the cross-hatched shape of the release film after the embossing process of the present invention.
Fig. 4 is a schematic structural diagram of the present invention.
The notations in the figures have the following meanings:
1-corona layer, 2-middle layer and 3-heat sealing layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
The embodiment of the invention discloses a cast polypropylene peelable release film and a preparation method thereof, wherein the release film is prepared from a cast polypropylene film through an off-line hot pressing process; the cast polypropylene film is prepared by co-extrusion casting of three layers of a corona layer 1, a middle layer 2 and a heat sealing layer 3, wherein the thickness ratio of the corona layer 1 to the middle layer 2 to the heat sealing layer 3 is as follows: 3: 14: 3. The off-line hot pressing process is off-line, but not collinear, namely, the off-line hot pressing process is carried out as a single process and is not produced with the previous process (casting process); the collinear hot pressing process refers to the collinear production simultaneously with the previous working procedure.
In the following examples, the grade of the polypropylene homopolymer resin is HD915CF manufactured by Nordic chemical company; the grade of the ternary copolymer polypropylene is FL7632 produced by Singapore tpc company; the grade of the smooth master batch is 10090-K produced by color and safety companies; the grade of the open master batch is AB20LD produced by Beijing Allen company; the processing aid is 100991-K produced by color and safety companies. The embossing thickness after embossing in the embossing process is more than one time of the embossing thickness before embossing, and the embossing has deeper net-shaped grains and uniform depth distribution lines.
Example 1
S1, weighing 230 parts by mass of polypropylene homopolymerization resin; 46 parts by mass of a terpolymer polypropylene; 0.9 part of smooth master batch; 0.9 part by mass of an opening master batch and 0.15 part by mass of a processing aid, wherein the heat sealing layer resin raw material, the middle layer resin raw material and the corona layer resin raw material are distributed in an extruder in parts by weight, and are subjected to cooling and shaping in a casting station after being co-extruded;
s2, carrying out corona treatment on the surface of a corona layer of the film subjected to casting and shaping;
and S3, performing an off-line hot pressing process on the corona-treated film to obtain the release film, namely performing an embossing process after the film reaches a softening point through a heating roller.
The process parameters are as follows: the temperatures of three machine barrels of the extruder are equally divided into three sections, and the temperatures of each section are respectively as follows: one section is 220 ℃, two sections are 255 ℃, three sections are 250 ℃, and the die head temperature of the extruder is 240 ℃. The roll surface temperature of the casting roll in the casting process in the step S1 is 15 ℃; the distance between the air knife and the cooling roller is 90CM; the air knife and the cooling roller form an angle of 45 degrees, namely the air knife forms an angle of 45 degrees with a vertical plane on the surface of the cooling roller; the air knife pressure is 5mbar; the vacuum box pressure was 1mbar. The power of the corona treatment was 8KW and the corona roller pressure was 3bar.
Example 2
S1, weighing 250 parts by mass of polypropylene homopolymerization resin; 50 parts by mass of a terpolymer polypropylene; 1 part by mass of a smooth master batch; 1 part by mass of an opening master batch and 0.2 part by mass of a processing aid, distributing a heat-sealing layer resin raw material, a middle layer resin raw material and a corona layer resin raw material in parts by weight of a formula into an extruder, and cooling and shaping at a casting station after co-extrusion;
s2, carrying out corona treatment on the surface of the corona layer of the film subjected to the casting and sizing;
and S3, performing an off-line hot pressing process on the corona-treated film to obtain the release film, namely performing an embossing process after the film reaches a softening point through a heating roller.
The process parameters are as follows: the temperatures of three machine barrels of the extruder are equally divided into three sections, and the temperatures of each section are respectively as follows: one section is 220 ℃, two sections are 255 ℃, three sections are 250 ℃, and the die head temperature of the extruder is 240 ℃. The roll surface temperature of the casting roll in the casting process in the step S1 is 15 ℃; the distance between the air knife and the cooling roller is 90CM; the air knife and the cooling roller form an angle of 45 degrees, namely the air knife forms an angle of 45 degrees with a vertical plane on the surface of the cooling roller; the air knife pressure is 5mbar; the vacuum box pressure was 1mbar. The power of the corona treatment was 8KW and the corona roller pressure was 3bar.
Example 3
S1, weighing 270 parts by mass of polypropylene homopolymerization resin; 54 parts by mass of a terpolymer polypropylene; 1.1 parts by mass of a smooth master batch; 1.1 parts by mass of an opening master batch and 0.25 part by mass of a processing aid, distributing the heat-sealing layer resin raw material, the middle layer resin raw material and the corona layer resin raw material in parts by weight of the formula into an extruder, and cooling and shaping in a casting station after co-extrusion;
s2, carrying out corona treatment on the surface of a corona layer of the film subjected to casting and shaping;
and S3, performing an off-line hot pressing process on the corona-treated film to obtain the release film, namely performing an embossing process after the film reaches a softening point through a heating roller.
The process parameters are as follows: the temperatures of three machine barrels of the extruder are equally divided into three sections, and the temperatures of each section are respectively as follows: the temperature of the first section is 220 ℃, the temperature of the second section is 255 ℃, the temperature of the third section is 250 ℃, and the temperature of a die head of the extruder is 240 ℃. The roll surface temperature of the casting roll in the casting process in the step S1 is 15 ℃; the distance between the air knife and the cooling roller is 90CM; the air knife and the cooling roller form an angle of 45 degrees, namely the air knife forms an angle of 45 degrees with the vertical plane on the surface of the cooling roller; the air knife pressure is 5mbar; the vacuum box pressure was 1mbar. The power of the corona treatment was 8KW and the corona roller pressure was 3bar.
Comparative example 1
S1, weighing 270 parts by mass of polypropylene homopolymerization resin; 54 parts by mass of a terpolymer polypropylene; 1.1 parts by mass of a smooth master batch; 1.1 parts by mass of an open master batch and 0.2 parts by mass of a processing aid, wherein the heat-sealing layer resin raw material, the middle layer resin raw material and the corona layer resin raw material in parts by weight of the formula are distributed in an extruder, and are cooled and shaped in a casting station after being co-extruded;
s2, carrying out corona treatment on the surface of a corona layer of the film subjected to casting and shaping;
and S3, coating silicone oil on the polypropylene layer.
The physical properties of the polypropylene homopolymer resins of the above examples 1 to 3 are shown in the following Table 1:
Figure 192878DEST_PATH_IMAGE001
for the release film, because appropriate high rigidity is favorable for the forming effect of a hot pressing process and the stiffness of the film after hot pressing, and further favorable for stabilizing and improving the release effect of the release film, the polypropylene homopolymerization resin in the invention is HD915CF produced by northern Europe chemical engineering company, is based on northern star polymerization technology, and adopts high-crystallization polypropylene homopolymerization resin produced by unique northern star nucleation technology (BNT), so that high rigidity can be provided for the structure of the release film, and the stiffness and the heat resistance of the release film can be favorably improved.
The grade of the ternary copolymer polypropylene is FL7632 produced by Singapore tpc company, the ternary copolymer polypropylene has good fluidity and good formability at the melting temperature, and has two characteristics in processing: one is as follows: the viscosity of the melt is obviously reduced (less influenced by temperature) along with the increase of the shear speed; and the second step is as follows: high molecular orientation degree, good processing temperature of about 200-300 ℃, good thermal stability (decomposition temperature of 310 ℃), obvious reduction of viscosity along with the increase of shearing speed, therefore, the fluidity is improved by increasing the pressure and speed, the shrinkage deformation and the dent are improved, and the melt can pass through a narrow die and has excellent processing performance. The performance characteristics of the ternary copolymer polypropylene can provide a better processing stability of the tape casting processing procedure for the invention.
The test data for examples 1-3 and comparative example 1 are shown in table 2 below:
Figure 503774DEST_PATH_IMAGE002
in the above table 2, the thickness of the release film after embossing in the embodiments 1 to 3 is much greater than that of the film before embossing, that is, as shown in fig. 2, it is indicated that the release film after embossing has a shape of a cross-hatched pattern, and the thickness of the release film is increased, so that the contact area when the release film is attached to the pressure-sensitive adhesive is reduced, and the contact surface is not an integral plane, thereby avoiding the generation of bubbles and improving the release effect of the invention; and the longitudinal tensile strength, the transverse tensile strength, the longitudinal elongation at break, the transverse elongation at break, the haze, the friction coefficient and the residual adhesive force of the examples 1 to 3 are all higher than those of the comparative example 1, which shows that the overall performance of the release film prepared by the invention is higher than that of the release film prepared by the comparative example 1, and the release force of the release film prepared by the examples 1 to 3 is closer to that of the release film prepared by the comparative example 1, which shows that the release effect of the release film prepared by the invention is equivalent to that of the release film prepared by using the organic silicon oil as the release agent, but the invention is safer in preparation raw materials, more beneficial to the raw materials for preparing packaged foods and medicines and meets higher packaging requirements. As shown in fig. 3, the shape of the reticulate pattern on the release film is a structure spliced by a plurality of diamonds, the internal angle of each diamond is 60 degrees, the side length is 2mm, and the thickness of any one side is 0.4mm.
The above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its aspects.

Claims (7)

1. The cast polypropylene peelable release film is characterized in that the release film is prepared from a cast polypropylene film through an off-line hot pressing process; the cast polypropylene film is prepared by co-extrusion casting of a corona layer (1), an intermediate layer (2) and a heat sealing layer (3), wherein the thickness ratio of the corona layer (1), the intermediate layer (2) and the heat sealing layer (3) is 3: 14: 3;
the corona layer (1) comprises 90-110 parts by mass of polypropylene homopolymerized resin; the middle layer (2) comprises 70-80 parts by mass of polypropylene homopolymerized resin and 23-27 parts by mass of ternary copolymerized polypropylene; the heat sealing layer (3) comprises 70-80 parts by mass of polypropylene homopolymerization resin, 23-27 parts by mass of ternary polymerization polypropylene, 0.9-1.1 parts by mass of smooth master batch, 0.9-1.1 parts by mass of opening master batch and 0.15-0.25 part by mass of processing aid; the grade of the polypropylene homopolymerization resin is HD915CF produced by northern Europe chemical industry company; the grade of the ternary copolymer polypropylene is FL7632 produced by Singapore tpc company; the grade of the smooth master batch is 10090-K produced by color and safety companies; the grade of the open master batch is AB20LD produced by Beijing Allen company; the grade of the processing aid is 100991-K produced by an color matching company;
the shape of the reticulate pattern on the release film is of a plurality of rhombus splicing structures, the internal angle of each rhombus is 60 degrees, the side length is 2mm, and the thickness of any side is 0.4mm.
2. A cast polypropylene releasable release film according to claim 1, wherein the corona layer (1) comprises 100 parts by mass of a polypropylene homo-polymer resin; the intermediate layer (2) comprises 75 parts by mass of polypropylene homopolymerization resin and 25 parts by mass of ternary copolymerization polypropylene; the heat sealing layer (3) comprises 75 parts by mass of polypropylene homopolymerization resin, 25 parts by mass of ternary polymerization polypropylene, 1 part by mass of smooth master batch, 1 part by mass of opening master batch and 0.2 part by mass of processing aid.
3. A method of producing the cast polypropylene releasable release film according to any one of claims 1 to 2, characterized by comprising the steps of:
s1, weighing the resin raw materials of the heat-sealing layer (3), the middle layer (2) and the corona layer (1) in corresponding parts by weight according to a formula, co-extruding the resin raw materials in an extruder, and cooling and shaping the resin raw materials in a casting station;
s2, carrying out corona treatment on the surface of the corona layer (1) of the film subjected to casting and shaping;
and S3, performing an off-line hot pressing process on the corona-treated film to obtain the release film, namely performing an embossing process after the film in the step S2 reaches the softening point of the film through a heating roller.
4. The method for preparing the cast polypropylene peelable release film according to claim 3, wherein in the embossing process, the thickness of the film after embossing is more than one time of the thickness of the film before embossing.
5. The method for preparing the cast polypropylene peelable release film according to claim 3, wherein the temperatures of three barrels of the extruder are divided into three sections, and the temperatures of each section are as follows: the temperature of the first section is 220 ℃, the temperature of the second section is 255 ℃, the temperature of the third section is 250 ℃, and the temperature of the die head of the extruder is 240 ℃.
6. The method for preparing the cast polypropylene peelable release film according to claim 3, wherein the roll surface temperature of the casting roll in the casting process in the step S1 is 15 ℃; the distance between the air knife and the cooling roller is 90CM; the air knife and the cooling roller form an angle of 45 degrees; the air knife pressure is 5mbar; the vacuum box pressure was 1mbar.
7. The method for preparing the cast polypropylene peelable release film according to claim 3, wherein the power of the corona treatment is 8KW and the corona roller pressure is 3bar.
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CN113524835A (en) * 2021-06-09 2021-10-22 黄山永新股份有限公司 Composite packaging material with metal wire drawing on surface and preparation method thereof
CN113386401A (en) * 2021-06-21 2021-09-14 扬州万润光电科技有限公司 Cast polypropylene peelable release film and processing method thereof
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