CN114248523B - Cast polypropylene film and aluminum plastic film - Google Patents

Cast polypropylene film and aluminum plastic film Download PDF

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Publication number
CN114248523B
CN114248523B CN202111335227.8A CN202111335227A CN114248523B CN 114248523 B CN114248523 B CN 114248523B CN 202111335227 A CN202111335227 A CN 202111335227A CN 114248523 B CN114248523 B CN 114248523B
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polypropylene
slipping agent
melting
amide
point
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CN114248523A (en
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徐孟进
范云峰
邸喜强
王莉
柳青
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Lucky Film Co Ltd
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Lucky Film 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/085—Layered products comprising a layer of metal comprising metal 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 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/746—Slipping, anti-blocking, low friction
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides

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  • Chemical & Material Sciences (AREA)
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  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The invention relates to a cast polypropylene film and an aluminum plastic film, wherein the polypropylene cast film comprises an adhesive layer, a core layer and a heat sealing layer which are sequentially laminated, and the heat sealing layer is formed by 50-60 parts by weight of random copolymer polypropylene, 30-40 parts by weight of block copolymer polypropylene, 0.7-3.5 parts by weight of slipping agent and 0.4-1.0 part by weight of silicon dioxide; wherein the slipping agent comprises an organosilicone slipping agent and an amide slipping agent. The heat sealing layer formed by the components can stably reduce the friction coefficient of the heat sealing layer for a long time, can ensure that the heat sealing cover of the aluminum plastic film still has lower friction coefficient after the aluminum plastic film is cured at high temperature, further improves the deep drawing formability of the aluminum plastic film, and does not reduce the packaging strength and the transparency.

Description

Cast polypropylene film and aluminum plastic film
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a cast polypropylene film and an aluminum plastic film.
Background
At present, an aluminum plastic film generally comprises an aluminum plastic film CPP (cast polypropylene film) layer, and in order to enable the aluminum plastic film to have excellent deep drawing forming performance, a smooth coating is generally coated on the surface of the aluminum plastic film to reduce the friction coefficient of the aluminum plastic film, so that the sliding performance of the aluminum plastic film on the surface of a die is improved, and the purpose of improving the forming depth is achieved. The implementation of the smooth coating increases the processing procedure of the aluminum plastic film, and the aluminum plastic film has no economy.
Although the problem of increasing the processing step can be improved by adding the composition to the layered structure of the cast polypropylene film to reduce the friction coefficient, this method has many drawbacks, in particular, there are problems that the friction coefficient becomes large at the time of curing at a higher temperature, there is a problem that the precipitation of the composition contaminates the guide roller to affect the processing performance, it is difficult to balance the friction coefficient and the packaging performance, a higher addition amount is required to maintain a lower friction coefficient, there is a risk of decreasing the transparency of the CPP film, and the like.
Therefore, there is a need for improvements in cast polypropylene films.
Disclosure of Invention
The present invention aims to improve at least to some extent at least one of the above technical problems.
In order to improve the technical problems, the invention provides a casting polypropylene film, which comprises an adhesive layer, a core layer and a heat sealing layer which are sequentially laminated, wherein the material for forming the heat sealing layer comprises 50-60 parts by weight of random copolymer polypropylene, 30-40 parts by weight of block copolymer polypropylene, 0.7-3.5 parts by weight of slipping agent and 0.4-1.0 parts by weight of silicon dioxide; wherein the slipping agent comprises an organosilicone slipping agent and an amide slipping agent. The heat sealing layer formed by the components can stably reduce the friction coefficient of the heat sealing layer for a long time, can ensure that the heat sealing cover of the aluminum plastic film still has lower friction coefficient after the aluminum plastic film is cured at high temperature, further improves the deep drawing formability of the aluminum plastic film, and does not reduce the packaging strength and the transparency.
According to an embodiment of the present invention, the content of the organosilicone slipping agent is 0.5 to 2.5 parts by weight, and the content of the amide slipping agent is 0.2 to 1.0 parts by weight. The organic silicone slipping agent and the amide slipping agent with the contents are matched with each other, so that the surface friction coefficient of the cast polypropylene film can be greatly reduced.
According to an embodiment of the invention, the weight average molecular weight of the organosilicone slipping agent is 10 ten thousand to 100 ten thousand.
According to an embodiment of the invention, the melting point of the amide slip agent is 110-160 ℃; further, the amide slip agent comprises a low melting point amide slip agent and a high melting point amide slip agent; the melting point of the low-melting-point amide slipping agent is 110-130 ℃, and the melting point of the high-melting-point amide slipping agent is 140-160 ℃; further, the mass ratio of the low-melting-point amide slipping agent to the high-melting-point amide slipping agent is 1: (1-2); therefore, in the early stage of high-temperature curing, the low-melting-point amide slipping agent component can be quickly migrated to the surface of the cast polypropylene film, so that the purpose of quickly reducing the friction coefficient is achieved; with the prolongation of curing time or storage time, the high-melting-point amide slipping agent component can be further migrated to the surface of the cast polypropylene film, so that the high-temperature long-acting property of low friction coefficient is ensured. The low-melting-point amide slipping agent and the high-melting-point amide slipping agent are matched with each other, so that the high-temperature long-acting property of the low friction coefficient of the surface of the cast polypropylene film can be ensured.
Further, the low-melting-point slipping agent comprises at least one of ethylene bis-oleamide and ethylene bis-erucamide; the high-melting-point slipping agent comprises at least one of ethylene bis-stearamide and ethylene bis-lauramide;
according to an embodiment of the invention, the silica has a particle size of 0.1-0.5 μm. Thus, the cast polypropylene film can be reinforced. In addition, as the surface of the silicon dioxide contains a plurality of silicon hydroxyl groups, the amide slipping agent can be fixed through the polar attraction effect, so that the migration rate of the amide slipping agent is further reduced, and the thermal stability and the long-acting property of the low friction coefficient are improved.
According to the embodiment of the invention, the random copolymer polypropylene is ethylene propylene binary random copolymer polypropylene, the melting point of the random copolymer polypropylene is 130-145 ℃, and the melt index of the random copolymer polypropylene is 4-8g/10min.
According to the embodiment of the invention, the block copolymerized polypropylene is ethylene propylene binary block copolymerized polypropylene, the melting point of the block copolymerized polypropylene is 150-165 ℃, and the melt index of the block copolymerized polypropylene is 4-8g/10min.
According to an embodiment of the present invention, the raw material for forming the adhesive layer includes block copolymerized polypropylene; the block copolymerization polypropylene comprises ethylene propylene binary block copolymerization polypropylene, the melting point of the block copolymerization polypropylene is 160-165 ℃, and the melt index of the block copolymerization polypropylene is 3-5g/10min.
According to an embodiment of the present invention, the material forming the core layer includes block copolymerized polypropylene and homo-polymerized polypropylene; the mass ratio of the block copolymerized polypropylene to the homopolypropylene is 1:1; the block copolymerization polypropylene comprises ethylene propylene binary block copolymerization polypropylene, the melting point of the block copolymerization polypropylene is 160-165 ℃, and the melt index of the block copolymerization polypropylene is 3-5g/10min; the melting point of the homo-polypropylene is 160-170 ℃, and the melt index of the homo-polypropylene is 3-5g/10min.
According to an embodiment of the invention, the ratio of the thickness of the adhesive layer, the thickness of the core layer and the thickness of the heat-seal layer is 1: (2-4): 1.
The invention also provides an aluminum-plastic film, which comprises the casting polypropylene film. Thus, the aluminum plastic film has all the features and advantages of the cast polypropylene film described above, and is not described herein.
Drawings
FIG. 1 is a schematic view showing the structure of a polypropylene casting film in one embodiment of the present invention;
reference numerals illustrate:
110-adhesive layer, 120-core layer, 130-heat seal layer.
Detailed Description
Embodiments of the present application are described in detail below. The following examples are illustrative only and are not to be construed as limiting the application. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents used were not manufacturer-identified and were all commercially available conventional products.
The aluminum plastic film generally comprises an aluminum plastic film CPP (cast polypropylene film) layer, so that the friction coefficient of the surface of the aluminum plastic film is reduced, the sliding performance of the aluminum plastic film on the surface of a die can be improved, and the purpose of improving the molding depth is achieved. The existing mode for reducing the friction coefficient of the CPP (cast polypropylene) layer of the aluminum plastic film has the defects that the processing procedure is complex, the friction coefficient is increased when curing at a higher temperature, the composition is separated out to pollute a guide roller, the processing performance is further influenced, the friction coefficient and the packaging performance are difficult to balance, the higher addition amount is required to keep the lower friction coefficient, the transparency risk of the CPP film is reduced, and the like.
The present invention aims to improve at least to some extent at least one of the above technical problems.
In order to improve the technical problems described above, the present invention provides a cast polypropylene film, referring to fig. 1, comprising an adhesive layer 110, a core layer 120 and a heat sealing layer 130 laminated in this order, wherein the material forming the heat sealing layer 130 comprises 50-60 parts by weight of random copolymer polypropylene, 30-40 parts by weight of block copolymer polypropylene, 0.7-3.5 parts by weight of a slip agent, and 0.4-1.0 parts by weight of silica; wherein the slipping agent comprises an organosilicone slipping agent and an amide slipping agent. The heat sealing layer formed by the components can stably reduce the friction coefficient of the heat sealing layer for a long time, can ensure that the heat sealing cover of the aluminum plastic film still has lower friction coefficient after the aluminum plastic film is cured at high temperature, further improves the deep drawing formability of the aluminum plastic film, and does not reduce the packaging strength and the transparency. In addition, the aluminum plastic film assembled by the cast polypropylene film has the advantages that the surface of the cast polypropylene film does not need to be coated with smooth coating liquid, the friction coefficient can be kept low even if the cast polypropylene film is cured at high temperature, and the packaging strength and the haze are not affected.
According to an embodiment of the present invention, the content of the organosilicone slipping agent is 0.5 to 2.5 parts by weight, and the content of the amide slipping agent is 0.2 to 1.0 parts by weight. The organic silicone slipping agent and the amide slipping agent with the contents are matched with each other, so that the surface friction coefficient of the cast polypropylene film can be greatly reduced. If the content of the silicone slipping agent is too small, the friction coefficient cannot be effectively reduced. If the content of the silicone slip agent is too large, on the one hand, the packaging strength is lowered and on the other hand, the haze of the cast polypropylene film is increased. If the amount of the amide slipping agent added is too small, the friction coefficient cannot be effectively reduced. If the amount of the amide slip agent added is too large, there is a risk of precipitation of the contaminated guide roller.
According to an embodiment of the present invention, the weight average molecular weight of the organosilicone slipping agent is 10-100 ten thousand, for example 10 ten thousand, 15 ten thousand, 20 ten thousand, 25 ten thousand, 30 ten thousand, 35 ten thousand, 40 ten thousand, 45 ten thousand, 50 ten thousand, 55 ten thousand, 60 ten thousand, 65 ten thousand, 70 ten thousand, 75 ten thousand, 80 ten thousand, 85 ten thousand, 90 ten thousand, 95 ten thousand, 100 ten thousand. The organic silicone is a non-migrating slipping agent, and slipping property of the organic silicone is not affected by time and temperature, so that slipping property of the organic silicone can be permanently maintained. If the weight average molecular weight of the organosilicone slipping agent is too small, the intermolecular force is small, the organosilicone slipping agent has a transfer risk, and the organosilicone slipping agent is easy to transfer from the surface of the heat sealing layer to the surface of the bonding layer, so that the bonding performance of the bonding surface is reduced; if the molecular weight of the organosilicone slipping agent is too large, the organosilicone slipping agent has the problem of poor dispersion, and a uniformly dispersed film layer is difficult to form on the surface in the melt extrusion process of the cast polypropylene film, so that the friction coefficient cannot be effectively reduced.
According to some embodiments of the invention, the weight average molecular weight of the organosilicone slip agent is preferably 20-40 ten thousand.
According to an embodiment of the invention, the amide slip agent is preferably a small molecule amide slip agent. The amide slip agent is a migratory slip agent.
According to an embodiment of the invention, the amide slip agent has a melting point of 110-160 ℃, such as 110 ℃, 115 ℃, 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃, 150 ℃, 155 ℃, 160 ℃.
If the melting point of the amide slip agent is too low, the amide slip agent tends to migrate or volatilize in a high temperature environment to increase the coefficient of friction. If the melting point of the amide slip agent is too high, the migration rate of the amide slip agent is slow and it is difficult to rapidly decrease the friction coefficient of the cast polypropylene film surface.
According to some embodiments of the invention, the amide slip agent includes a low melting amide slip agent and a high melting amide slip agent; the melting point of the low-melting-point amide slipping agent is 110-130 ℃, and the melting point of the high-melting-point amide slipping agent is 140-160 ℃. In the early stage of high-temperature curing, the low-melting-point amide slipping agent component with the melting point in the range of 110-130 ℃ can rapidly migrate to the surface of the cast polypropylene film, so that the purpose of rapidly reducing the friction coefficient is achieved; with the prolongation of curing time or storage time, the high-melting-point amide slipping agent component with the melting point in the range of 140-160 ℃ can be further migrated to the surface of the cast polypropylene film, so that the high-temperature long-term efficiency of low friction coefficient is ensured.
According to some embodiments of the invention, the amide slip agent is a fatty amide compound. Specifically, the low-melting-point slipping agent comprises at least one of ethylene bis-oleamide and ethylene bis-erucamide; the high-melting-point slipping agent comprises at least one of ethylene bis-stearamide and ethylene bis-lauramide. Wherein the melting point of ethylene bis-oleamide is 115 ℃, the melting point of ethylene bis-erucamide is 125 ℃, the melting point of ethylene bis-stearamide is 145 ℃, and the melting point of ethylene bis-lauramide is 155 ℃.
According to some embodiments of the invention, the mass ratio of the low melting point amide slip agent to the high melting point amide slip agent is 1: (1-2), e.g., 1:1, 1:1.5, 1:2. Therefore, the high-temperature long-acting performance of the low friction coefficient of the surface of the cast polypropylene film can be ensured, the low friction coefficient is still realized when the cast polypropylene film is cured at a higher temperature, and the defect that the friction coefficient of the cast polypropylene film is increased when the cast polypropylene film is cured at a higher temperature is overcome.
Although the slip agent can greatly reduce the surface friction coefficient of the cast polypropylene film, the slip agent can cause the reduction of the packaging performance of the cast polypropylene film. The silica as a reinforcing component can improve the defects of the slipping agent, and in particular, the silica can reinforce the cast polypropylene film and ensure the packaging performance of the cast polypropylene film.
By adding silica, it is possible to reinforce the cast polypropylene film, synergistically reduce the coefficient of friction and improve the thermal stability and long-lasting property of the low coefficient of friction. In addition, as the surface of the silicon dioxide contains a plurality of silicon hydroxyl groups, the amide slipping agent can be fixed through the polar attraction effect, so that the migration rate of the amide slipping agent is further reduced, and the thermal stability and the long-acting property of the low friction coefficient are improved.
According to an embodiment of the present invention, the content of silica is 0.4 to 1.0 parts by weight, for example, 0.4 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, 1.0 parts by weight. If the amount of silica added is too small, the apparent concavo-convex effect of the cast polypropylene film cannot be effectively increased. If the amount of silica added is too large, silica is at risk of agglomeration to affect the appearance of the cast polypropylene film.
According to an embodiment of the present invention, the silica has a particle size of nano-scale. The casting polypropylene film can be reinforced by adding the nano-scale silicon dioxide, so that the packaging performance of the casting polypropylene film is ensured. The reinforcing effect of nanoscale silica is mainly affected by two aspects: on one hand, the toughness of the cast polypropylene film is increased by utilizing the small-size effect and the large specific surface area of the nano silicon dioxide particles; on the other hand, the surface of the particle contains a plurality of silicon hydroxyl groups, and the particle can form an interpenetrating network structure through the action of hydrogen bonds and Van der Waals forces. On the one hand, the microscopic concave-convex appearance formed by the nano silicon dioxide particles can reduce the friction force by reducing the contact area so as to improve the smoothness of the cast polypropylene film, thereby reducing the dosage of the organosilicone slipping agent and keeping the high transparency of the cast polypropylene film; on the other hand, the nano silicon dioxide can reinforce the casting polypropylene film and improve the mechanical property of the casting polypropylene film, thereby ensuring that the casting polypropylene film still has better heat sealing strength after being assembled into an aluminum plastic film. By adding nano-scale silica, the production cost of the cast polypropylene film can be further reduced.
According to an embodiment of the invention, the silica has a particle size of 0.1-0.5 μm, e.g. 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm. If the particle diameter of the silica is too small, it is difficult for the silica particles to greatly increase the irregularities on the surface of the cast polypropylene film, and the purpose of synergistically reducing the friction coefficient cannot be achieved. If the particle diameter of the silica is too large, the silica particles cannot effectively reinforce the cast polypropylene film.
According to the embodiment of the invention, the random copolymer polypropylene is ethylene propylene binary random copolymer polypropylene, the melting point of the random copolymer polypropylene is 130-145 ℃, and the melt index of the random copolymer polypropylene is 4-8g/10min. Specifically, the melt flow rate of the random copolymer polypropylene is 4-8g/10min at 230 ℃ under the load of 2.16 kg.
According to the embodiment of the invention, the block copolymerized polypropylene is ethylene propylene binary block copolymerized polypropylene, the melting point of the block copolymerized polypropylene is 150-165 ℃, and the melt index of the block copolymerized polypropylene is 4-8g/10min. Specifically, the block copolymerized polypropylene has a melt flow rate of 4-8g/10min at 230 ℃ under a load of 2.16 kg.
According to an embodiment of the present invention, the raw material for forming the adhesive layer includes block copolymerized polypropylene; the block copolymerization polypropylene comprises ethylene propylene binary block copolymerization polypropylene, the melting point of the block copolymerization polypropylene is 160-165 ℃, and the melt index of the block copolymerization polypropylene is 3-5g/10min. Specifically, the block copolymerized polypropylene has a melt flow rate of 3-5g/10min at 230 ℃ under a load of 2.16 kg.
According to an embodiment of the present invention, the material forming the core layer includes block copolymerized polypropylene and homo-polymerized polypropylene; the mass ratio of the block copolymerized polypropylene to the homopolypropylene is 1:1; the block copolymerization polypropylene comprises ethylene propylene binary block copolymerization polypropylene, the melting point of the block copolymerization polypropylene is 160-165 ℃, and the melt index of the block copolymerization polypropylene is 3-5g/10min; specifically, the block copolymerized polypropylene has a melt flow rate of 3-5g/10min at 230 ℃ under a load of 2.16 kg. The melting point of the homo-polypropylene is 160-170 ℃, the melt index of the homo-polypropylene is 3-5g/10min, and specifically, the melt flow rate of the homo-polypropylene is 3-5g/10min under the conditions that the temperature is 230 ℃ and the load is 2.16 kg.
According to an embodiment of the present invention, the material forming the adhesive layer, the material forming the core layer, and the material forming the heat-seal layer may each include an antioxidant. The type and content of antioxidants in each layer are not limited in the present invention, and may be selected by those skilled in the art according to the use requirements.
According to an embodiment of the present invention, the adhesive layer, the core layer and the heat seal layer are formed by coextrusion casting.
According to an embodiment of the invention, the ratio of the thickness of the adhesive layer, the thickness of the core layer and the thickness of the heat-seal layer is 1: (2-4): 1, for example, may be 1:2:1, 1:2.5:1, 1:3:1, 1:3.5:1, 1:4:1.
The invention also provides an aluminum-plastic film, which comprises the casting polypropylene film. Thus, the aluminum plastic film has all the features and advantages of the cast polypropylene film described above, and will not be described herein.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not limiting in any way.
The cast polypropylene films of the examples and comparative examples were prepared using the following processing techniques: and respectively putting the formula materials of each layer into three groups of double-screw extruders, and pushing the materials to a three-layer distributor for extrusion by a melt pump after gradient temperature rise to obtain the three-layer co-extrusion CPP film. Trimming and rolling after thickness adjustment and corona treatment on the bonding surface to obtain the casting polypropylene film.
After the cast polypropylene film is obtained, an aluminum plastic film is assembled according to the following process: 1) Acid and alkali cleaning and trivalent chromium treatment are carried out on the surface of the aluminum foil; 2) Coating and compositing the corona surface of the PA film and the matte surface of the aluminum foil by using a dry-method compositing machine and using double-component polyurethane glue; glue drying temperature is 90 ℃, and drying time is 15s; the temperature of the composite roller is 90 ℃, and the composite pressure is 0.4Mpa; 3) Using a dry-method compounding machine, and using modified polyolefin glue to glue and compound the adhesive layer of the tape-casting polypropylene film and the aluminum foil bright surface; glue drying temperature 70 ℃ and drying time 20s; the temperature of the composite roller is 100 ℃, and the composite pressure is 0.5Mpa; 4) And (3) curing the compounded aluminum-plastic film at 80 ℃ for 3 days to obtain a finished product. After the aluminum plastic film is cured and stored for a certain time under different temperature conditions, the haze of the CPP surface of the aluminum plastic film, the packaging strength of the aluminum plastic film and the friction coefficient of the CPP surface of the aluminum plastic film are tested. Specific parameters of each of the examples and comparative examples are shown in table 1 below.
TABLE 1 specific parameters for examples 1-8 and comparative examples 1-2
Remarks: the melt index is measured according to GB/T3682.1, and the test condition is 230 ℃ and 2.16kg; the melting point is determined according to GB/T19466.3.
Evaluation of performance:
Static friction coefficient of CPP surface of aluminum-plastic film: the plastic-aluminum films assembled from the CPP films in each of the above examples and comparative examples were stored at different temperatures (25 ℃, 45 ℃, 60 ℃) for 6 months, and were sampled 1 week, 1 month, 3 months, and 6 months after storage, respectively, and the static friction coefficients of the plastic-aluminum film surfaces were measured. The static friction coefficient was recorded using an atanan light friction coefficient instrument at a load of 200g and a friction speed of 100 mm/min, and the test results are recorded in table 2.
It should be noted that, the static friction coefficient of the CPP surface of the aluminum plastic film is: in the aluminum plastic film, the friction coefficient of the CPP surface (namely the heat sealing layer) far away from the joint side with the aluminum foil bright surface is increased.
Package strength: the packaging strength is packaged according to the conditions of 200 ℃/0.4Mpa/3 s.
TABLE 2 Performance test results of CPP film assembled aluminum-plastic films in examples 1-8 and comparative examples 1-2
Remarks: coefficient of friction +.: less than 0.15; the following steps: greater than 0.15 and less than 0.20; and (3) the following materials: greater than 0.20;
packaging strength +.: 90-100N/15 mm; the method comprises the following steps: 70-80N/15 mm;
Haze +.: less than 10%; delta: > 10%.
From the test results of the aluminum plastic films assembled by the CPP films of each example in Table 2, it can be seen that the cast polypropylene film (CPP film) of the present invention has good thermal stability of friction coefficient, packaging strength and haze.
As can be seen from the test results of example 4, example 6 and example 7, the CPP film has a long-term stable low friction coefficient after being assembled into an aluminum plastic film by using the low-melting-point amide slip agent and the high-melting-point amide slip agent. Specifically, in example 6, after the CPP film using only the low-melting-point amide slipping agent is assembled into an aluminum plastic film, the long-term heat-resistant stability effect of the friction coefficient is lower than that of the system using both the low-melting-point amide slipping agent and the high-melting-point amide slipping agent; in example 7, after the CPP film using only the high-melting-point amide slipping agent was assembled into an aluminum plastic film, the initial friction coefficient was large, and it was difficult to satisfy the low friction coefficient CPP film requirement. In example 8, the melting point of erucamide is less than 110 ℃, and after the CPP film containing erucamide is assembled into an aluminum plastic film, the friction coefficient and the heat resistance stability are extremely poor. Further, it is described that only when the low-melting-point amide slipping agent and the high-melting-point amide slipping agent are used, the CPP film has a long-acting stable low friction coefficient after being assembled into an aluminum plastic film.
As can be seen from the test results of comparative examples 1 and 2, the heat seal strength of comparative example 2 was significantly lower than that of examples 1-8 when no silica was added, the coefficient of friction of comparative example 1 was significantly lower than that of examples 1-5 when no amide slip agent and silica were added, and the heat seal strength of comparative example 1 was significantly lower than that of examples 1-8. It was demonstrated that only when amide slip agent and silica were added, the aluminum plastic film assembled from CPP film had better test results.
In the description of the present specification, reference is made to the terms "one embodiment," "another embodiment," "an example," "another example," etc., meaning that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. The casting polypropylene film is characterized by comprising an adhesive layer, a core layer and a heat sealing layer which are sequentially laminated, wherein the heat sealing layer is formed by 50-60 parts by weight of random copolymer polypropylene, 30-40 parts by weight of block copolymer polypropylene, 0.7-3.5 parts by weight of slipping agent and 0.4-1.0 part by weight of silicon dioxide;
Wherein the slipping agent comprises an organic silicone slipping agent and an amide slipping agent,
The amide slip agent comprises a low-melting-point amide slip agent and a high-melting-point amide slip agent,
The melting point of the amide slipping agent is 110-160 ℃;
The melting point of the low-melting-point amide slipping agent is 110-130 ℃, and the melting point of the high-melting-point amide slipping agent is 140-160 ℃;
the mass ratio of the low-melting-point amide slipping agent to the high-melting-point amide slipping agent is 1: (1-2);
The low-melting-point slipping agent comprises at least one of ethylene bis-oleamide and ethylene bis-erucamide;
The high-melting-point slipping agent comprises at least one of ethylene bis-stearamide and ethylene bis-lauramide.
2. The cast polypropylene film according to claim 1, wherein the content of the organosilicone slipping agent is 0.5 to 2.5 parts by weight and the content of the amide slipping agent is 0.2 to 1.0 parts by weight.
3. The cast polypropylene film according to claim 2, wherein the weight average molecular weight of the organosilicone slip agent is 10-100 ten thousand.
4. The cast polypropylene film according to claim 2, wherein the silica has a particle size of 0.1 to 0.5 μm.
5. The cast polypropylene film according to claim 1, wherein the random copolymer polypropylene is ethylene propylene binary random copolymer polypropylene, the melting point of the random copolymer polypropylene is 130-145 ℃, and the melt index of the random copolymer polypropylene is 4-8g/10min.
6. The cast polypropylene film according to claim 1, wherein the block copolymerized polypropylene is ethylene propylene binary block copolymerized polypropylene, the block copolymerized polypropylene has a melting point of 150-165 ℃, and the block copolymerized polypropylene has a melt index of 4-8g/10min.
7. The cast polypropylene film according to claim 1, wherein the raw material forming the adhesive layer comprises block copolymerized polypropylene;
The block copolymerization polypropylene comprises ethylene propylene binary block copolymerization polypropylene, the melting point of the block copolymerization polypropylene is 160-165 ℃, and the melt index of the block copolymerization polypropylene is 3-5g/10min.
8. The cast polypropylene film of claim 1, wherein the material forming the core layer comprises block copolymerized polypropylene and homo-polymerized polypropylene; the mass ratio of the block copolymerized polypropylene to the homopolypropylene is 1:1;
The block copolymerization polypropylene comprises ethylene propylene binary block copolymerization polypropylene, the melting point of the block copolymerization polypropylene is 160-165 ℃, and the melt index of the block copolymerization polypropylene is 3-5g/10min;
The melting point of the homo-polypropylene is 160-170 ℃, and the melt index of the homo-polypropylene is 3-5g/10min.
9. The cast polypropylene film according to claim 1, wherein the ratio of the thickness of the adhesive layer, the thickness of the core layer and the thickness of the heat seal layer is 1: (2-4): 1.
10. An aluminum-plastic film, characterized in that the aluminum-plastic film comprises the cast polypropylene film according to any one of claims 1 to 9.
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