CN113183580A - Biaxially oriented polypropylene release film, preparation method thereof and adhesive tape film - Google Patents

Biaxially oriented polypropylene release film, preparation method thereof and adhesive tape film Download PDF

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Publication number
CN113183580A
CN113183580A CN202110593705.9A CN202110593705A CN113183580A CN 113183580 A CN113183580 A CN 113183580A CN 202110593705 A CN202110593705 A CN 202110593705A CN 113183580 A CN113183580 A CN 113183580A
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CN
China
Prior art keywords
layer
release
resin
biaxially oriented
propylene
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Pending
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CN202110593705.9A
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Chinese (zh)
Inventor
乔胜琦
胡卓荣
徐文树
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Guangdong Decro Package Films Co ltd
GUANGDONG DECRO FILM NEW MATERIALS CO Ltd
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Guangdong Decro Package Films Co ltd
GUANGDONG DECRO FILM NEW MATERIALS CO Ltd
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Priority to CN202110593705.9A priority Critical patent/CN113183580A/en
Publication of CN113183580A publication Critical patent/CN113183580A/en
Pending legal-status Critical Current

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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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/403—Adhesives in the form of films or foils characterised by release liners characterised by the structure of the release feature
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/405—Adhesives in the form of films or foils characterised by release liners characterised by the substrate of the release liner
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
    • B32B2037/268—Release layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/0028—Stretching, elongating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/045—Presence of homo or copolymers of ethene in the release coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene
    • C09J2423/105—Presence of homo or copolymers of propene in the release coating

Abstract

A biaxially oriented polypropylene release film sequentially comprises a surface layer, a core layer and a release layer; the surface layer and the core layer both comprise polypropylene resin; the release layer comprises ethylene-propylene-butylene ternary copolymer resin and propylene-silicon block copolymer resin. According to the biaxially oriented polypropylene release film, the release layer is formed on the core layer, the propylene-silicon block copolymer resin is added into the release layer, and the silicon element is embedded into the molecular structure, so that the propylene-silicon block copolymer resin is favorably and uniformly dispersed in the release layer, and the ethylene-propylene-butylene terpolymer resin has good binding force with the polypropylene resin in the core layer, so that the release effect can be achieved without coating silicone oil, the release layer and the core layer are favorably co-extruded in the preparation process, the process is simplified, and the cost is reduced.

Description

Biaxially oriented polypropylene release film, preparation method thereof and adhesive tape film
Technical Field
The invention belongs to the technical field of release films, and particularly relates to a biaxially oriented polypropylene release film, a preparation method thereof and an adhesive tape film.
Background
Biaxially oriented polypropylene film, abbreviated as BOPP film, is a film made by stretching a polypropylene resin in a machine direction and a transverse direction synchronously or asynchronously at a certain temperature and speed and subjecting the stretched film to appropriate cooling or heat treatment or special processing (such as corona). After stretching, the molecular chain and the lamella of the polypropylene are highly oriented along two directions, and the optical property and the mechanical property of the BOPP film are greatly improved. BOPP film is a very important flexible packaging material, is colorless, odorless, tasteless, and toxic, and has high tensile strength, impact strength, and good transparency.
The adhesive tape film comprises a substrate layer, a bottom coating layer and an adhesive tape layer from bottom to top, wherein the substrate layer is usually a biaxially oriented polypropylene film (BOPP film for short) or a biaxially oriented polyester film (BOPET film for short), the thickness of the substrate layer is 12-20 mu m, and the BOPP film has the characteristics of high transparency, good brightness, water resistance, heat resistance, low price and the like, and is an ideal material for the adhesive tape film.
In practical application, the adhesive tape film is usually rolled and stored, and the adhesive layer covers the substrate layer after rolling. However, the BOPP film has low surface energy, and the acrylate used for preparing the glue layer has very strong polarity, and is easily adhered to the surface of the BOPP film, so that the BOPP film cannot be unwound or the glue layer is degummed. Therefore, when the BOPP film is used as the substrate layer, a material with lower surface energy needs to be coated on the BOPP film, so that the substrate layer and the glue layer are easy to peel off during use, and then the glue layer is coated.
The traditional adhesive tape film needs to cover one surface of a BOPP film with silicone oil with lower surface energy so as to achieve the release effect, and then coats an adhesive on the other surface so as to achieve the sticking effect. However, silicone oil is difficult to be directly extruded with BOPP to form a film in a coextrusion mode, and the silicone oil can only be coated on the BOPP film by adopting a coating process, so that the working procedure and the processing cost are increased, and other materials with low surface energy cannot achieve the release effect of the silicone oil.
In the prior art, a Chinese patent CN 109278388A discloses a delustering type high-barrier biaxially-oriented polypropylene cold seal base film and a preparation method thereof, wherein the delustering type high-barrier biaxially-oriented polypropylene cold seal base film sequentially comprises a release layer, a barrier layer, a core layer and a delustering layer from outside to inside, the release layer comprises antistatic master batch, organosilicon modified polypropylene and polypropylene, wherein the organosilicon modified polypropylene comprises polypropylene, vinyl elastomer, ethylene-propylene-butadiene, antioxidant, methyl silicone oil and ethyl silicone oil; the preparation method of the release layer comprises the steps of physically mixing raw materials such as methyl silicone oil, ethyl silicone oil, polypropylene, vinyl elastomer, ethylene-propylene-butadiene copolymer and the like through an extruder, and then granulating and drying the mixture to obtain the release layer, wherein the phenomenon of uneven dispersion of liquid silicone oil in solid raw materials possibly exists in the method; in addition, even if the raw materials can be uniformly mixed, the total content of the silicone oil in the raw materials is less than or equal to 3.5%, the silicone oil content on the surface of the BOPP film after subsequent longitudinal and transverse stretching is less, and the release effect is not ideal.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a biaxially oriented polypropylene release film, which can achieve a good release effect without coating silicone oil by forming a release layer on a core layer and adding propylene-silicon block copolymer resin and ethylene-propylene-butylene terpolymer resin into the release layer.
The invention is realized by the following technical scheme:
a biaxially oriented polypropylene release film sequentially comprises a surface layer, a core layer and a release layer; the surface layer and the core layer both comprise polypropylene resin; the release layer comprises ethylene-propylene-butylene ternary copolymer resin and propylene-silicon block copolymer resin.
According to the biaxially oriented polypropylene release film, the release layer is formed on the core layer, the propylene-silicon block copolymer resin is added into the release layer, and the silicon element is embedded into the molecular structure, so that the propylene-silicon block copolymer resin is favorably and uniformly dispersed in the release layer, and the ethylene-propylene-butylene terpolymer resin has good binding force with the polypropylene resin in the core layer, so that the release effect can be achieved without coating silicone oil, the release layer and the core layer are favorably co-extruded in the preparation process, the process is simplified, and the cost is reduced.
Further, the release layer comprises 70-90% of ethylene-propylene-butylene ternary copolymer resin and 10-30% of propylene-silicon block copolymer resin. Adding a proper amount of ethylene-propylene-butylene terpolymer resin to enhance the affinity of the release layer and the surface layer; if the content of the propylene-silicon block copolymer resin is too low, the mold release effect cannot be achieved, and if the content of the propylene-silicon block copolymer resin is too high, the cost is increased.
Further, the ethylene-propylene-butylene terpolymer resin has a melt index of 3-7 g/10min (190 ℃, 2.16kg) and a melting point of 120-150 ℃; the propylene-silicon block copolymer resin has a melt index of 10-15 g/10min (190 ℃, 2.16kg) and a melting point of 120-160 ℃. The propylene-silicon block copolymer resin and the ethylene-propylene-butylene terpolymer resin with the melt index range can make the release effect and the combination effect with other core layers better.
Further, the thickness of the release layer is 1-2 μm; the thickness of the surface layer is 1-2 mu m; the thickness of the biaxially oriented polypropylene release film is 12-25 mu m. If the thickness of the release layer is too large, the haze of the biaxially oriented polypropylene release film is increased, and the production cost is increased; if the thickness of the release layer is too small, a good release effect is difficult to achieve, and the release layer is not favorable for unwinding in the application of the adhesive tape film.
Further, the release layer also comprises an anti-blocking agent; the skin layer further comprises at least one of an anti-blocking agent, a blend of high density polyethylene and ethylene-propylene-butene terpolymer, and a blend of high density polyethylene and homopolypropylene. And adding an anti-adhesion agent or an anti-adhesion component to ensure that the surface layer and the release layer are not easy to adhere after the biaxially oriented polypropylene release film is rolled.
Further, corona treatment is carried out on the surface layer, so that the surface tension of the surface layer is favorably enhanced, the biaxially oriented polypropylene release film has good printing adaptability, a coating process can be realized on the surface layer, and the biaxially oriented polypropylene release film is applied to preparation of adhesive tape films.
The invention also provides a method for preparing the biaxially oriented polypropylene release film, which comprises the following steps:
co-extruding and cooling the surface layer, the core layer and the release layer to form a resin sheet; longitudinally stretching and transversely stretching the resin sheet; and carrying out corona treatment on the surface layer and rolling.
According to the method for preparing the biaxially oriented polypropylene release film, the biaxially oriented polypropylene release film with the release effect is produced through a biaxially oriented process, the surface layer, the core layer and the release layer have good binding force, so that a good co-extrusion effect is achieved, the release layer has the release effect, an additional silicone oil coating process is not needed, the cost is reduced, and the production efficiency is improved.
Further, the extrusion temperature of the surface layer and the core layer is 220-260 ℃, and the extrusion temperature of the release layer is 200-250 ℃. Because the surface layer and the core layer both comprise polypropylene, the release layer comprises ethylene-propylene-butylene terpolymer resin, and the melting point of the ethylene-propylene-butylene terpolymer resin is lower than that of the polypropylene, the temperature of the release layer is required to be controlled and cannot be too high during extrusion.
The invention also provides an adhesive tape film which sequentially comprises the biaxially oriented polypropylene release film, a primer layer and a glue layer, wherein the primer layer is coated on the surface layer, and the glue layer is coated on the primer layer.
The adhesive tape film reduces the peeling force required between the rolled biaxially oriented polypropylene release film and the adhesive tape layer, and has a good release effect.
Further, the glue layer comprises at least one of polypropylene resin, water-based acrylate adhesive and octene-polyolefin resin. This is a specific embodiment, which provides a glue layer with a better gluing effect.
Detailed Description
The invention provides a biaxially oriented polypropylene release film which sequentially comprises a surface layer, a core layer and a release layer;
the surface layer and the core layer both comprise polypropylene resin; the release layer comprises ethylene-propylene-butylene ternary copolymer resin and propylene-silicon block copolymer resin.
According to the biaxially oriented polypropylene release film, the release layer is formed on the core layer, the propylene-silicon block copolymer resin is added into the release layer, and the silicon element is embedded into the molecular structure, so that the propylene-silicon block copolymer resin is favorably and uniformly dispersed in the release layer, and the ethylene-propylene-butylene terpolymer resin has good binding force with the polypropylene resin in the core layer, so that the release effect can be achieved without coating silicone oil, the release layer and the core layer are favorably co-extruded in the preparation process, the process is simplified, and the cost is reduced.
Preferably, the release layer comprises 70-90% of ethylene-propylene-butylene terpolymer resin and 10-30% of propylene-silicon block copolymer resin. Adding a proper amount of ethylene-propylene-butylene terpolymer resin to enhance the affinity of the release layer and the surface layer; if the content of the propylene-silicon block copolymer resin is too low, the mold release effect cannot be achieved, and if the content of the propylene-silicon block copolymer resin is too high, the cost is increased.
Preferably, the ethylene-propylene-butylene terpolymer resin has a melt index of 3-7 g/10min (190 ℃, 2.16kg) and a melting point of 120-150 ℃; the propylene-silicon block copolymer resin has a melt index of 10-15 g/10min (190 ℃, 2.16kg) and a melting point of 120-160 ℃. The propylene-silicon block copolymer resin and the ethylene-propylene-butylene terpolymer resin with the melt index range can make the release effect and the combination effect with other core layers better.
Preferably, the thickness of the release layer is 1-2 μm; the thickness of the surface layer is 1-2 mu m; the thickness of the biaxially oriented polypropylene release film is 12-25 mu m. If the thickness of the release layer is too large, the haze of the biaxially oriented polypropylene release film is increased, and the production cost is increased; if the thickness of the release layer is too small, a good release effect is difficult to achieve, and the release layer is not favorable for unwinding in the application of the adhesive tape film.
Preferably, the release layer further comprises an anti-blocking agent; the skin layer further comprises at least one of an anti-blocking agent, a blend of high density polyethylene and ethylene-propylene-butene terpolymer, and a blend of high density polyethylene and homopolypropylene. And adding an anti-adhesion agent or an anti-adhesion component to ensure that the surface layer and the release layer are not easy to adhere after the biaxially oriented polypropylene release film is rolled.
Preferably, the surface layer is subjected to corona treatment, so that the surface tension of the surface layer is enhanced, the biaxially oriented polypropylene release film has good printing adaptability, a coating process can be realized on the surface layer, and the biaxially oriented polypropylene release film is applied to preparation of adhesive tape films.
A preparation method of a biaxially oriented polypropylene release film comprises the following steps:
co-extruding and cooling the surface layer, the core layer and the release layer to form a resin sheet; longitudinally stretching and transversely stretching the resin sheet; and carrying out corona treatment on the surface layer and rolling.
According to the method for preparing the biaxially oriented polypropylene release film, the biaxially oriented polypropylene release film with the release effect is produced through a biaxially oriented process, the surface layer, the core layer and the release layer have good binding force, so that a good co-extrusion effect is achieved, the release layer has the release effect, an additional silicone oil coating process is not needed, the cost is reduced, and the production efficiency is improved.
Preferably, the extrusion temperature of the surface layer and the core layer is 220-260 ℃, and the extrusion temperature of the release layer is 200-250 ℃. Because the surface layer and the core layer both comprise polypropylene, the release layer comprises ethylene-propylene-butylene terpolymer resin, and the melting point of the ethylene-propylene-butylene terpolymer resin is lower than that of the polypropylene, the temperature of the release layer is required to be controlled and cannot be too high during extrusion.
The invention also provides an adhesive tape film which sequentially comprises the biaxially oriented polypropylene release film, a primer layer and a glue layer, wherein the primer layer is coated on the surface layer, and the glue layer is coated on the primer layer.
The adhesive tape film reduces the peeling force required between the rolled biaxially oriented polypropylene release film and the adhesive tape layer, and has a good release effect.
The glue layer comprises at least one of polypropylene resin, water-based acrylate adhesive and octene-polyolefin resin. This is a specific embodiment, which provides a glue layer with a better gluing effect.
Example 1
This embodiment 1 provides a biaxially oriented polypropylene release film, including the following steps:
(1) preparing a surface layer;
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 5.5g/10min (190 ℃, 2.16kg) and the melting point of 134 ℃, propylene-silicon block copolymer resin with the melt index of 12g/10min (190 ℃, 2.16kg) and the melting point of 130 ℃ and anti-blocking master batch according to the weight ratio of 86:10: 4;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching by 5 times, introducing into a transverse stretching device, preheating at 162 ℃, transversely stretching by 8.5 times, and finally carrying out corona treatment and rolling. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
Example 2
This embodiment 2 provides a biaxially oriented polypropylene release film, including the following steps:
(1) preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 5.5g/10min (190 ℃, 2.16kg) and the melting point of 134 ℃, propylene-silicon block copolymer resin with the melt index of 12g/10min (190 ℃, 2.16kg) and the melting point of 130 ℃ and anti-blocking master batch according to the weight ratio of 76:20: 4;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
the resin sheet is preheated at 130 ℃ and then longitudinally stretched by 5 times, then introduced into a transverse stretching device, preheated at 162 ℃ and then stretched by 8.5 times, and finally wound by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
Example 3
This embodiment 3 provides a biaxially oriented polypropylene release film, including the following steps:
(1) preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 5.4g/10min (190 ℃, 2.16kg) and the melting point of 137 ℃, propylene-silicon block copolymer resin with the melt index of 12g/10min (190 ℃, 2.16kg) and the melting point of 130 ℃ and anti-blocking master batch according to the weight ratio of 86:10: 4;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching the resin sheet for 5 times, introducing the resin sheet into a transverse stretching device, preheating the resin sheet at 162 ℃, stretching the resin sheet for 8.5 times, and finally winding the resin sheet by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
Example 4
This embodiment 4 provides a biaxially oriented polypropylene release film, including the following steps:
(1) preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg)/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 5.4g/10min (190 ℃, 2.16kg) and the melting point of 137 ℃, propylene-silicon block copolymer resin with the melt index of 12g/10min (190 ℃, 2.16kg) and the melting point of 130 ℃ and anti-blocking master batch according to the weight ratio of 76:20: 4;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching the resin sheet for 5 times, introducing the resin sheet into a transverse stretching device, preheating the resin sheet at 162 ℃, stretching the resin sheet for 8.5 times, and finally winding the resin sheet by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
Example 5
This embodiment 5 provides a biaxially oriented polypropylene release film, which includes the following steps:
(1) preparing a surface layer;
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the melting point of 120 ℃, propylene-silicon block copolymer resin with the melt index of 10g/10min (190 ℃, 2.16kg) and the melting point of 120 ℃ and anti-blocking master batch according to the weight ratio of 70:26: 4;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 220 ℃, and the extrusion temperature of the release layer is 200 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching by 5 times, introducing into a transverse stretching device, preheating at 162 ℃, transversely stretching by 8.5 times, and finally carrying out corona treatment and rolling. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 10 micrometers, the thickness of the release layer is 1m, and the total thickness of the biaxially oriented polypropylene release film is 12 micrometers.
Example 6
This embodiment 6 provides a biaxially oriented polypropylene release film, which includes the following steps:
(1) preparing a surface layer;
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 7g/10min (190 ℃, 2.16kg) and the melting point of 150 ℃ and propylene-silicon block copolymer resin with the melt index of 15g/10min (190 ℃, 2.16kg) and the melting point of 160 ℃ according to the weight ratio of 90: 10;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 260 ℃, and the extrusion temperature of the release layer is 250 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching by 5 times, introducing into a transverse stretching device, preheating at 162 ℃, transversely stretching by 8.5 times, and finally carrying out corona treatment and rolling. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and finally, after aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 2 micrometers, the thickness of the core layer is 21 micrometers, the thickness of the release layer is 2 micrometers, and the total thickness of the biaxially oriented polypropylene release film is 25 micrometers.
Example 7
This embodiment 7 provides a biaxially oriented polypropylene release film, which includes the following steps:
(1) preparing a surface layer;
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 7g/10min (190 ℃, 2.16kg) and the melting point of 150 ℃ and propylene-silicon block copolymer resin with the melt index of 15g/10min (190 ℃, 2.16kg) and the melting point of 160 ℃ according to the weight ratio of 70: 30;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 260 ℃, and the extrusion temperature of the release layer is 250 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching by 5 times, introducing into a transverse stretching device, preheating at 162 ℃, transversely stretching by 8.5 times, and finally carrying out corona treatment and rolling. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and finally, after aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 2 micrometers, the thickness of the core layer is 21 micrometers, the thickness of the release layer is 2 micrometers, and the total thickness of the biaxially oriented polypropylene release film is 25 micrometers.
Comparative example 1
(1) Preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing homo-polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg), the melting point of 167 ℃ and the isotacticity of 95%, propylene-silicon block copolymer resin with the melt index of 12g/10min (190 ℃, 2.16kg) and the melting point of 130 ℃ and anti-blocking master batch according to the weight ratio of 86:10: 4;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching the resin sheet for 5 times, introducing the resin sheet into a transverse stretching device, preheating the resin sheet at 162 ℃, stretching the resin sheet for 8.5 times, and finally winding the resin sheet by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and (3) carrying out aging treatment, then cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 μm, the thickness of the core layer is 17 μm, and the thickness of the release layer is 2 μm.
Comparative example 2
(1) Preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10moin (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing homo-polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg), the melting point of 167 ℃ and the isotacticity of 95%, propylene-silicon block copolymer resin with the melt index of 12g/10min (190 ℃, 2.16kg) and the melting point of 130 ℃ and anti-blocking master batch according to the weight ratio of 76:20: 4;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching the resin sheet for 5 times, introducing the resin sheet into a transverse stretching device, preheating the resin sheet at 162 ℃, stretching the resin sheet for 8.5 times, and finally winding the resin sheet by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
Comparative example 3
(1) Preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
taking a homopolypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg), the melting point of 167 ℃, and the isotacticity of 95 percent, and an anti-blocking master batch according to 96 percent; 4, uniformly mixing the components in a weight ratio;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching the resin sheet for 5 times, introducing the resin sheet into a transverse stretching device, preheating the resin sheet at 162 ℃, stretching the resin sheet for 8.5 times, and finally winding the resin sheet by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
Comparative example 4
(1) Preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10moin (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
taking a second anti-static master batch, 2% of an anti-blocking master batch, 80% of organosilicon modified polypropylene and 13% of homopolymerized polypropylene;
the second antistatic master batch comprises a mixture of stearic acid polyethylene glycol ester, N-dihydroxyethyl octadecylamine, fatty alcohol polyether amide, a polyoxyethylene compound, polyol fatty acid ester and homopolymerized polypropylene; the organic silicon modified resin comprises 70% of polypropylene, 12% of vinyl elastomer, 13% of ethylene-propylene-butadiene, 3% of antioxidant, 1.5% of methyl silicone oil and 0.5% of ethyl silicone oil, and is prepared by extruding the organic silicon modified resin through a double-screw extruder, and granulating and drying.
(4) Introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the extrusion temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching the resin sheet for 5 times, introducing the resin sheet into a transverse stretching device, preheating the resin sheet at 162 ℃, stretching the resin sheet for 8.5 times, and finally winding the resin sheet by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
Comparative example 5
(1) Preparing a surface layer:
uniformly mixing polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent and the anti-blocking master batch according to the weight ratio of 96: 4;
(2) preparing a core layer:
taking polypropylene resin with the melt index of 3g/10min (190 ℃, 2.16kg) and the isotacticity of 95 percent;
(3) preparing a release layer:
uniformly mixing ethylene-propylene-butylene terpolymer resin with the melt index of 5.5g/10min (190 ℃, 2.16kg) and the melting point of 134 ℃, 20 percent of organic silicon modified polypropylene and an anti-blocking master batch according to the weight ratio of 76:20: 4; the organic silicon modified polypropylene comprises 70% of polypropylene, 12% of vinyl elastomer, 13% of ethylene-propylene-butadiene, 3% of antioxidant, 1.5% of methyl silicone oil and 0.5% of ethyl silicone oil, and is prepared by extruding the organic silicon modified polypropylene through a double-screw extruder, cutting into particles and drying;
(4) introducing the surface layer, the core layer and the release layer into an extruder for coextrusion, and converging the surface layer, the core layer and the release layer at a T-shaped die head through a runner distributor to form a resin melt, wherein the extrusion temperature of the surface layer and the core layer is 250 ℃, and the basic temperature of the release layer is 230 ℃; cooling by a chill roll at 28 ℃ and performing tape casting to prepare a resin sheet;
preheating the resin sheet at 130 ℃, longitudinally stretching the resin sheet for 5 times, introducing the resin sheet into a transverse stretching device, preheating the resin sheet at 162 ℃, stretching the resin sheet for 8.5 times, and finally winding the resin sheet by corona. Or, the resin sheet is stretched longitudinally and transversely by 45 times at 160 ℃, and then is wound after corona treatment;
(5) and performing aging treatment, cutting according to the required specification, and packaging to obtain the biaxially oriented polypropylene release film, wherein the thickness of the surface layer is 1 micrometer, the thickness of the core layer is 17 micrometers, and the thickness of the release layer is 2 micrometers.
The biaxially oriented polypropylene release films of examples 1 to 7 and comparative examples 1 to 5 were subjected to a performance test: the peel force of the biaxially oriented polyethylene release film is guessed by using the national 180-degree peel force test standard GB/T25256-:
TABLE 1-1 biaxially oriented polyethylene Release film Performance test
Figure BDA0003090220090000171
Figure BDA0003090220090000181
As can be seen from Table 1-1, the biaxially oriented polypropylene release films of examples 1-4 had lower peel force and maintained low haze;
compared with comparative examples 1 and 3, although the biaxially oriented polypropylene release films of comparative examples 1 and 3 have lower haze, the release effect is poor because the release force is higher than that of the biaxially oriented polypropylene release films of examples 1 to 4 due to the use of the homo-polypropylene in the release layer;
in comparative examples 4 and 5, the silicone modified polypropylene is added into the release layer, wherein the silicone modified polypropylene comprises methyl silicone oil and ethyl silicone oil, so that the release layer has a certain release effect, but the silicone modified polypropylene is formed by physical blending, liquid silicone oil is unevenly dispersed in other solid raw materials, the content of the methyl silicone oil and the content of the ethyl silicone oil are too low, the release effect is poor, and the peel force obtained by testing is large.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.

Claims (10)

1. A biaxially oriented polypropylene release film is characterized in that:
sequentially comprises a surface layer, a core layer and a release layer; the surface layer and the core layer both comprise polypropylene resin; the release layer comprises ethylene-propylene-butylene ternary copolymer resin and propylene-silicon block copolymer resin.
2. The biaxially oriented polypropylene release film of claim 1, wherein:
the release layer comprises 70-90% of ethylene-propylene-butylene ternary copolymer resin and 10-30% of propylene-silicon block copolymer resin.
3. The biaxially oriented polypropylene release film of claim 1, wherein:
the ethylene-propylene-butylene terpolymer resin has a melt index of 3-7 g/10min (190 ℃, 2.16kg) and a melting point of 120-150 ℃; the propylene-silicon block copolymer resin has a melt index of 10-15 g/10min (190 ℃, 2.16kg) and a melting point of 120-160 ℃.
4. The biaxially oriented polypropylene release film of claim 1, wherein:
the thickness of the release layer is 1-2 mu m; the thickness of the surface layer is 1-2 mu m;
the thickness of the biaxially oriented polypropylene release film is 12-25 mu m.
5. The biaxially oriented polypropylene release film of claim 1, wherein:
the release layer also comprises an anti-blocking agent;
the skin layer further comprises at least one of an anti-blocking agent, a blend of high density polyethylene and ethylene-propylene-butene terpolymer, and a blend of high density polyethylene and homopolypropylene. And adding an anti-adhesion agent or an anti-adhesion component to ensure that the surface layer and the release layer are not easy to adhere after the biaxially oriented polypropylene release film is rolled.
6. The biaxially oriented polypropylene release film of claim 1, wherein;
and carrying out corona treatment on the surface layer.
7. A process for preparing the biaxially oriented polypropylene release film according to any one of claims 1 to 6, wherein:
the method comprises the following steps:
co-extruding and cooling the surface layer, the core layer and the release layer to form a resin sheet; longitudinally stretching and transversely stretching the resin sheet; and carrying out corona treatment on the surface layer and rolling.
8. The method for preparing a biaxially oriented polypropylene release film according to claim 7, wherein:
the extrusion temperature of the surface layer and the core layer is 220-260 ℃, and the extrusion temperature of the release layer is 200-250 ℃.
9. An adhesive tape film characterized in that:
comprising in order the biaxially oriented polypropylene release film of any one of claims 1 to 6, a primer layer applied to the surface layer, and a glue layer applied to the primer layer.
10. The adhesive tape film according to claim 9, wherein:
the glue layer comprises at least one of polypropylene resin, water-based acrylate adhesive and octene-polyolefin resin.
CN202110593705.9A 2021-05-28 2021-05-28 Biaxially oriented polypropylene release film, preparation method thereof and adhesive tape film Pending CN113183580A (en)

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