CN109968762B - Cast polypropylene film for aluminum-plastic composite film and preparation method thereof - Google Patents
Cast polypropylene film for aluminum-plastic composite film and preparation method thereof Download PDFInfo
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- CN109968762B CN109968762B CN201811578425.5A CN201811578425A CN109968762B CN 109968762 B CN109968762 B CN 109968762B CN 201811578425 A CN201811578425 A CN 201811578425A CN 109968762 B CN109968762 B CN 109968762B
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- layer
- aluminum
- film
- polypropylene
- silicon dioxide
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- Laminated Bodies (AREA)
Abstract
The invention relates to a cast polypropylene film for an aluminum-plastic composite film and a preparation method thereof, wherein the three-layer co-extrusion cast polypropylene film is obtained by casting three extrusion heads of a melting extruder in a three-layer co-extrusion mode, and sequentially comprises a plasma treatment layer, a core layer and a heat sealing layer, wherein the plasma treatment layer is mainly prepared from random copolymer polypropylene, maleic anhydride modified polypropylene and a polyolefin elastomer; the core layer is mainly made of homopolymerized polypropylene, organic modified nano silicon dioxide and polyolefin elastomer; and the heat sealing layer is mainly made of random or block copolymerization polypropylene, polyolefin elastomer and slipping agent. This application is because the high heat conductivity and the pliability of this CPP film for the plastic-aluminum complex film that forms through hot method technology complex has more resistant deep shaping of dashing, changes low temperature heat-seal, more electrolyte resistant performance, has strengthened plastic-aluminum complex film's life and usage.
Description
Technical Field
The invention relates to the technical field of aluminum-plastic composite film production, in particular to a cast polypropylene film for an aluminum-plastic composite film and a preparation method thereof.
Background
The main structure of the flexible package of the lithium battery is formed by compounding three layers of film materials, namely a protective layer, an aluminum foil layer and a heat sealing layer from outside to inside, wherein the protective layer is a biaxially oriented nylon film and the heat sealing layer is cast polypropylene (CPP). The electrolyte of lithium cell contains multiple organic solvent and lithium salt, and the lithium salt meets water can produce the hydrofluoric acid of strong corrosivity rapidly, in case corroded CPP and even destroyed the tie coat of plastic-aluminum composite membrane inlayer to destroy the aluminium foil surface, can make CPP interlaminar heat-seal effect variation and CPP and aluminium foil separation, cause the gas expansion of lithium cell, weeping inefficacy scheduling problem.
At present, the CPP film still has some problems as a heat sealing material of an aluminum-plastic composite film. For example, when deep drawing is carried out, the CPP film with poor toughness and strength is easy to generate stress whitening and even burst; high temperature treatment can make the smooth agent on CPP film surface change, and the coefficient of friction control between heat-seal layer CPP surface and the mould of dashing deeply is difficult, also influences the shaping of dashing deeply of plastic-aluminum composite film, and the heat-seal effect between CPP film can not be good during the heat-seal, influences the resistant electrolyte performance of plastic-aluminum composite film.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cast polypropylene film for an aluminum-plastic composite film and a preparation method thereof. The bonding property of the bonding layer and the aluminum foil is improved, and the electrolyte resistance of the aluminum-plastic composite film is improved; the core layer has organic modified nano silicon dioxide with high thermal conductivity, so that the strength, flexibility and low-temperature heat sealability of the aluminum-plastic composite film are enhanced; the high-temperature-resistant slipping agent contained in the heat sealing layer enables the deep punching forming of the aluminum-plastic composite film to be more stable, so that the performance of the aluminum-plastic composite film for lithium battery packaging is better.
The purpose of the invention is realized by the following technical scheme:
a cast polypropylene film for an aluminum-plastic composite film is obtained by casting three extrusion heads of a melting extruder in a three-layer co-extrusion mode, and sequentially comprises a plasma treatment layer, a core layer and a heat sealing layer.
The total thickness of the cast polypropylene film for the aluminum-plastic composite film is 30-80 microns, and the thickness ratio of each plasma treatment layer, the core layer and the heat sealing layer is 1:3: 1.
The plasma processing layer is made of random copolymer polypropylene, maleic anhydride modified polypropylene and polyolefin elastomer, and the composition proportion is 65-80%: 10-15%: 10 to 15 percent.
The core layer is prepared from homopolymerized polypropylene, organic modified nano-silica and a polyolefin elastomer, and the composition proportion is 65-75%: 5-10%: 15-30%.
The heat sealing layer is made of random or block copolymerization polypropylene, a polyolefin elastomer and a slipping agent, and the composition ratio is 70-80%: 15-25%: 1 to 5 percent.
Preferably, the plasma treatment is to perform certain physicochemical modification on the surface of the film through a plasma surface treatment machine so as to change the surface roughness and the surface molecular activity of the surface of the plasma treatment layer and improve the adhesion between the surface of the plasma treatment layer and the aluminum foil. Compared with corona treatment, the method has the advantages of high treatment efficiency, less emission of harmful gases such as ozone and the like, no limitation of the size of an object and the like. Preferably, the maleic anhydride modified polypropylene in the plasma treatment layer has high reactivity, improves the adhesion between the CPP film and the aluminum foil, and enables the aluminum-plastic composite film to be more resistant to electrolyte.
Preferably, the core layer contains nano-scale organic modified silica with high thermal conductivity, so that the heat conduction rate and the flexibility are high, and the heat conduction rate and the formability during deep punching of the aluminum-plastic composite film during low-temperature heat sealing are improved.
The thermal conductivity of silicon dioxide is more than 30 times that of common polypropylene, so that the heat conduction rate during heat sealing can be increased, and the nano-scale silicon dioxide also has the advantages of large surface area, small size effect, macroscopic quantum tunneling effect and the like, and can improve the strength and flexibility of resin.
The purpose of the organic modification of the nano-scale silicon dioxide is to reduce the polarity and improve the compatibility with a resin matrix, and the main steps of the organic modification are as follows:
(3) preparing nano silicon dioxide:
preparing tetraethyl orthosilicate, ethanol and deionized water into a solution according to the volume ratio of 1:2 by adopting a sol-gel method, stirring the solution for 1h at 75 ℃ to mix the solution uniformly, adding hexadecylamine into the solution, keeping the volume ratio of the tetraethyl orthosilicate to the hexadecylamine at 3:2, continuously stirring the solution for 1h, controlling the pH value of the solution to be about 6, and aging the solution at room temperature to prepare milky gel; putting the prepared gel into a muffle furnace at 650 ℃ for high-temperature roasting for 1.5h to prepare nano silicon dioxide powder;
(4) activation of nano silicon dioxide:
placing the dried silicon dioxide in a sand bath under the protection of nitrogen and activating for 5 hours at the high temperature of 250 ℃ to obtain activated nano silicon dioxide;
(3) organic modification of nano-silica:
adding octanol into the activated nano-silica, heating and stirring at 120 ℃ for 1h under the catalysis of p-toluenesulfonic acid, refluxing for 1h, washing the product with absolute ethyl alcohol for 3 times, and drying to obtain the organic modified nano-silica.
The mass ratio of the activated nano silicon dioxide to the octanol is 1: 5;
the mass ratio of the activated nano silicon dioxide to the toluenesulfonic acid is 25: 1;
preferably, the slipping agent in the heat sealing layer is silicone master batch taking polypropylene as a carrier, and is more resistant to high temperature, so that the friction coefficient of the heat sealing layer is stable, the static friction coefficient of the surface of the heat sealing layer is 0.12-0.2, the dynamic friction coefficient is 0.1-0.2, and the stability of the aluminum-plastic composite film during deep punching forming is improved to a certain extent.
The components of the slipping agent are random copolymerization polypropylene and silicone, and the mass ratio of the random copolymerization polypropylene to the silicone is 1: 1.1.
The preparation method of the slipping agent comprises the following specific steps: the polypropylene and the silicone master batch with the mass ratio of 1:1.1 are stirred and mixed evenly under certain conditions, then corresponding additives are added, reaction, extrusion and granulation are carried out, and the silicone slipping agent which takes the random copolymerization polypropylene as the carrier and has the silicone content of 50 percent is prepared by a chemical grafting method.
The polyolefin elastomer in the CPP film is one or two of a propylene-based elastomer, a vinyl elastomer, an ethylene-acrylic acid copolymer and a rubber modified polypropylene polymer.
The aluminum-plastic composite film compounded by the CPP through the thermal process has the performances of higher resistance to deep drawing forming, easier low-temperature heat sealing and higher resistance to electrolyte.
A preparation method of a cast polypropylene film for an aluminum-plastic composite film comprises the following specific steps:
(1) and coating an outer-layer adhesive on the aluminum foil dark side subjected to double-sided passivation treatment by using an acidic chromium-containing passivation solution in a gravure roll coating manner, drying the aluminum foil dark side by using a drying tunnel, and then performing dry compounding on the aluminum foil dark side and a biaxially oriented nylon film. The passivation temperature of the aluminum foil is 200-220 ℃, the hot drying temperature is 80-150 ℃, and the composite hot pressing temperature is 100-150 ℃:
the outer layer adhesive is polyurethane resin and a polyisocyanate curing agent.
(2) And extruding and coating the inner layer resin adhesive on the bright surface of the aluminum foil compounded with the nylon by using a melt extruder, wherein the extrusion temperature is 160-240 ℃, so that the aluminum-plastic composite film is prepared.
The inner layer resin adhesive is acid modified polyolefin resin and an epoxy resin curing agent.
Compared with the prior art, the invention has the following positive effects:
the bonding strength between the plasma processing layer and the aluminum foil layer of the CPP film is enhanced; the core layer has high thermal conductivity, better strength and flexibility; the surface of the heat-seal layer has the advantage of more stable friction coefficient to the temperature, so that the prepared aluminum-plastic composite film has the characteristics of more resistance to deep drawing forming, easier low-temperature heat sealing and more resistance to electrolyte.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention.
The attached drawings indicate the following:
1 a nylon layer, wherein the nylon layer is a nylon layer,
2 an outer adhesive layer, wherein the outer adhesive layer,
3 a layer of aluminium foil having a high tensile strength,
4 an inner resin adhesive layer, a lower resin adhesive layer,
5 a CPP layer, a first CPP layer,
6, treating the layer by plasma treatment,
7, forming a core layer by using a composite material,
8 heat sealing the layers.
Detailed Description
The following provides a specific embodiment of the cast polypropylene film for the aluminum-plastic composite film and the preparation method thereof.
Example 1
A cast polypropylene film (CPP) for an aluminum-plastic composite film is obtained by casting three extrusion heads of a melting extruder in a three-layer co-extrusion mode, and sequentially comprises a plasma processing layer, a core layer and a heat sealing layer. The plasma processing layer is mainly made of random copolymerization polypropylene, maleic anhydride modified polypropylene and polyolefin elastomer, and the approximate composition proportion is 75%: 10%: 15 percent; the core layer is mainly made of homopolymerized polypropylene, organic modified nano silicon dioxide and polyolefin elastomer, and the approximate composition proportion is 65%: 5%: 30 percent; the heat sealing layer is mainly prepared from random or block copolymerization polypropylene, polyolefin elastomer and slipping agent, and the approximate composition proportion is 80%: 18%: 2 percent.
Preferably, in the cast polypropylene film (CPP) for the aluminum-plastic composite film, the plasma treatment layer is formed by performing a certain physical and chemical modification on the surface of the CPP by a plasma surface treatment machine.
The main steps of organic modification are as follows:
(1) preparing nano silicon dioxide:
adopting a sol-gel method to prepare tetraethyl orthosilicate, ethanol and deionized water into a solution according to the volume ratio of 1:2, stirring the solution for 1h at 75 ℃ to mix the solution uniformly, adding hexadecylamine into the solution, keeping the volume ratio of tetraethyl orthosilicate to hexadecylamine at 3:2, continuously stirring the solution for 1h, controlling the pH value of the solution to be about 6, and aging the solution at room temperature to prepare milky gel. And putting the prepared gel into a muffle furnace at 650 ℃ for high-temperature roasting for 1.5h to obtain the nano silicon dioxide powder.
(2) Activation of nano silicon dioxide:
placing the dried silicon dioxide in a sand bath under the protection of nitrogen and activating for 5 hours at the high temperature of 250 ℃ to obtain activated nano silicon dioxide;
(3) organic modification of nano-silica:
adding octanol into the activated nano-silica, heating and stirring at 120 ℃ for 1h under the catalysis of p-toluenesulfonic acid, refluxing for 1h, washing the product with absolute ethyl alcohol for 3 times, and drying to obtain the organic modified nano-silica.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film comprises a core layer containing the nanoscale organic modified silica with high thermal conductivity, and has a high thermal conduction rate and high flexibility.
Preferably, in the cast polypropylene film (CPP) for the aluminum-plastic composite film, the maleic anhydride modified polypropylene in the plasma treatment layer has high reactivity, and the adhesion between the CPP film and the aluminum foil is improved.
Preferably, the slip agent in the heat seal layer is silicone master batch taking polypropylene random copolymer as a carrier, so that the heat seal layer is more resistant to high temperature, the friction coefficient of the heat seal layer is stable, the static friction coefficient of the surface of the heat seal layer is 0.12-0.2, and the dynamic friction coefficient of the heat seal layer is 0.1-0.2.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film is one or two of a propylene-based elastomer, a vinyl elastomer, an ethylene-acrylic acid copolymer and a rubber modified polypropylene polymer.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film has a total thickness of 40 microns, and the thickness ratio of the plasma treatment layer to the core layer to the heat sealing layer is 1:3: 1. .
The performance is improved by adding the nano particles into the core layer of the CPP; and secondly, the plasma treatment and the high-temperature resistant slipping agent bring stable improvement of the surface performance of the composite layer and the heat sealing layer, so that the performance of the aluminum plastic film prepared by the CPP is optimized.
Example 2
The utility model provides a curtain coating polypropylene film (CPP) for plastic-aluminum complex film, this CPP film adopts the mode curtain coating of three-layer coextrusion to obtain through the three extruder heads of melting extruder, includes corona layer, sandwich layer and heat-seal layer in proper order. The plasma processing layer is mainly made of random copolymerization polypropylene and polyolefin elastomer, and the composition proportion is 75%: 25 percent; the core layer is mainly made of homopolymerized polypropylene and polyolefin elastomer, and the composition proportion is 80%: 20 percent; the heat sealing layer is mainly prepared from random or block copolymerization polypropylene, polyolefin elastomer and high temperature resistant silicone slipping agent, and the composition proportion is 80%: 18%: 2 percent.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film is one or two of a propylene-based elastomer, a vinyl elastomer, an ethylene-acrylic acid copolymer and a rubber modified polypropylene polymer.
Preferably, in the cast polypropylene film (CPP) for the aluminum-plastic composite film, the plasma treatment layer is formed by performing a certain physical and chemical modification on the surface of the CPP by a plasma surface treatment machine.
Preferably, the slip agent in the heat seal layer is silicone master batch taking polypropylene random copolymer as a carrier, so that the heat seal layer is more resistant to high temperature, the friction coefficient of the heat seal layer is stable, the static friction coefficient of the surface of the heat seal layer is 0.12-0.2, and the dynamic friction coefficient of the heat seal layer is 0.1-0.2.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film is one or two of a propylene-based elastomer, a vinyl elastomer, an ethylene-acrylic acid copolymer and a rubber modified polypropylene polymer.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film has a total thickness of 40 microns, and the thickness ratio of the plasma treatment layer, the core layer and the heat sealing layer is 1:3: 1.
Example 3
A cast polypropylene film (CPP) for an aluminum-plastic composite film is obtained by casting three extrusion heads of a melting extruder in a three-layer co-extrusion mode, and sequentially comprises a plasma processing layer, a core layer and a heat sealing layer. The plasma processing layer is mainly made of random copolymerization polypropylene, maleic anhydride modified polypropylene and polyolefin elastomer, and the approximate composition proportion is 75%: 10%: 15 percent; the core layer is mainly made of homopolymerized polypropylene, organic modified nano silicon dioxide and polyolefin elastomer, and the approximate composition proportion is 65%: 5%: 30 percent; the heat sealing layer is mainly prepared from random or block copolymerization polypropylene, polyolefin elastomer and slipping agent, and the approximate composition proportion is 80%: 18%: 2 percent.
Preferably, in the cast polypropylene film (CPP) for the aluminum-plastic composite film, the plasma treatment layer is formed by performing a certain physical and chemical modification on the surface of the CPP by a plasma surface treatment machine.
The main steps of organic modification are as follows:
(1) preparing nano silicon dioxide:
adopting a sol-gel method to prepare tetraethyl orthosilicate, ethanol and deionized water into a solution according to the volume ratio of 1:2, stirring the solution for 1h at 75 ℃ to mix the solution uniformly, adding hexadecylamine into the solution, keeping the volume ratio of tetraethyl orthosilicate to hexadecylamine at 3:2, continuously stirring the solution for 1h, controlling the pH value of the solution to be about 6, and aging the solution at room temperature to prepare milky gel. And putting the prepared gel into a muffle furnace at 650 ℃ for high-temperature roasting for 1.5h to obtain the nano silicon dioxide powder.
(2) Activation of nano silicon dioxide:
placing the dried silicon dioxide in a sand bath under the protection of nitrogen and activating for 5 hours at the high temperature of 250 ℃ to obtain activated nano silicon dioxide;
(3) organic modification of nano-silica:
adding octanol into the activated nano-silica, heating and stirring at 120 ℃ for 1h under the catalysis of p-toluenesulfonic acid, refluxing for 1h, washing the product with absolute ethyl alcohol for 3 times, and drying to obtain the organic modified nano-silica.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film comprises a core layer containing the nanoscale organic modified silica with high thermal conductivity, and has a high thermal conduction rate and high flexibility.
Preferably, in the cast polypropylene film (CPP) for the aluminum-plastic composite film, the maleic anhydride modified polypropylene in the plasma treatment layer has high reactivity, and the adhesion between the CPP film and the aluminum foil is improved.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film comprises an erucamide slipping agent which is not resistant to high temperature in a heat sealing layer, the static friction coefficient of the surface of the heat sealing layer is 0.2-0.3, and the dynamic friction coefficient is 0.2-0.3.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film is one or two of a propylene-based elastomer, a vinyl elastomer, an ethylene-acrylic acid copolymer and a rubber modified polypropylene polymer.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film has a total thickness of 40 microns, and the thickness ratio of the plasma treatment layer to the core layer to the heat sealing layer is 1:3: 1.
Example 4
The three-layer co-extrusion casting polypropylene film is obtained by casting three extrusion heads of a melting extruder in a three-layer co-extrusion mode, and sequentially comprises a corona treatment layer, a core layer and a heat sealing layer. The corona treatment layer is mainly made of random copolymer polypropylene, maleic anhydride modified polypropylene and polyolefin elastomer, and the approximate composition proportion is 75%: 10%: 15 percent; the core layer is mainly made of homopolymerized polypropylene, organic modified nano silicon dioxide and polyolefin elastomer, and the approximate composition proportion is 65%: 5%: 30 percent; the heat sealing layer is mainly prepared from random or block copolymerization polypropylene, polyolefin elastomer and high temperature resistant silicone slipping agent, and the approximate composition proportion is 80%: 18%: 2 percent.
Preferably, the corona treatment layer is formed by carrying out corona treatment on the surface of the cast polypropylene (CPP) by using high frequency and high voltage, so that the surface molecules are oxidized and polarized, and the adhesion of the surface of the film is enhanced.
The main steps of organic modification are as follows:
(1) preparing nano silicon dioxide:
adopting a sol-gel method to prepare tetraethyl orthosilicate, ethanol and deionized water into a solution according to the volume ratio of 1:2, stirring the solution for 1h at 75 ℃ to mix the solution uniformly, adding hexadecylamine into the solution, keeping the volume ratio of tetraethyl orthosilicate to hexadecylamine at 3:2, continuously stirring the solution for 1h, controlling the pH value of the solution to be about 6, and aging the solution at room temperature to prepare milky gel. And putting the prepared gel into a muffle furnace at 650 ℃ for high-temperature roasting for 1.5h to obtain the nano silicon dioxide powder.
(2) Activation of nano silicon dioxide:
placing the dried silicon dioxide in a sand bath under the protection of nitrogen and activating for 5 hours at the high temperature of 250 ℃ to obtain activated nano silicon dioxide;
(3) organic modification of nano-silica:
adding octanol into the activated nano-silica, heating and stirring at 120 ℃ for 1h under the catalysis of p-toluenesulfonic acid, refluxing for 1h, washing the product with absolute ethyl alcohol for 3 times, and drying to obtain the organic modified nano-silica.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film comprises a core layer containing the nanoscale organic modified silica with high thermal conductivity, and has a high thermal conduction rate and high flexibility.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film has high reactivity and improves the adhesion between the CPP film and the aluminum foil.
Preferably, the slip agent in the heat seal layer is silicone master batch taking polypropylene random copolymer as a carrier, so that the heat seal layer is more resistant to high temperature, the friction coefficient of the heat seal layer is stable, the static friction coefficient of the surface of the heat seal layer is 0.12-0.2, and the dynamic friction coefficient of the heat seal layer is 0.1-0.2.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film is one or two of a propylene-based elastomer, a vinyl elastomer, an ethylene-acrylic acid copolymer and a rubber modified polypropylene polymer.
Preferably, the cast polypropylene film (CPP) for the aluminum-plastic composite film has a total thickness of 40 microns, and the thickness ratio of the plasma treatment layer to the core layer to the heat sealing layer is 1:3: 1.
The thickness of the aluminum foil is 40 micrometers, the thickness of the nylon is 25 micrometers, after two sides of the aluminum foil are passivated, the dark side of the aluminum foil is coated with an outer layer adhesive to be in dry compounding with the nylon, an inner layer resin adhesive is extruded to the bright side of the aluminum foil through a melting extruder, and the aluminum foil is thermally compounded with the CPP film in the embodiments 1, 2, 3 and 4, so that the 113 micrometer aluminum-plastic composite film is prepared.
The CPP films of examples 1, 2, 3 and 4 were subjected to a high temperature treatment at 60 ℃ for 1 day to test the change in the surface friction coefficient of the heat-seal face and a universal tester to test the longitudinal tensile strength and elongation at break, respectively. The test results are shown in the table:
TABLE 1
As can be seen from the properties of Table 1 of the CPP in the above examples 1, 2 and 3, the tensile strength and elongation at break of the CPP in example 1 are both larger than those of the CPP in example 2, and the coefficient of dynamic friction of the surface of the CPP heat-seal layer in examples 1 and 2 is not changed before and after high temperature, which is related to the modification of the organized nano-silica; the change in the coefficient of dynamic friction of the CPP heat-seal lands after being subjected to high-temperature treatment in example 1 was much smaller than that of the CPP in example 3, and the tensile strength and elongation at break of the two were substantially similar, indicating that the addition of the silicone slipping agent makes the CPP heat-seal lands less susceptible to high temperatures. The tensile strength, the elongation at break and the surface dynamic friction coefficient of the heat sealing layer of the CPP in the example 1 are similar to those of the example 4 due to high-temperature changes, and the properties of the CPP in the examples 2 and 3 are combined, so that the mechanical property and the heat sealing layer property of the CPP are not influenced to a certain extent by the plasma and the corona treatment.
The aluminum-plastic composite films prepared by CPP in examples 1, 2, 3 and 4 were subjected to the punching depth (punching depth pressure of 0.5MPa, punching depth time of 5 s) and heat sealing (heat sealing pressure of 0.35MPa, upper and lower mold temperature of 200 ℃ and heat sealing time of 210, 4 s) tests under the same test parameters on an aluminum-plastic film punching forming machine and a single-station heat sealing machine, respectively. The heat seal strength of the aluminum plastic film and the peeling strength of AL// CPP were tested by a universal tester.
The test results of the aluminum-plastic composite films manufactured in examples 1, 2, 3 and 4 are shown in table 2:
compared with the aluminum-plastic composite film prepared from the CPP film in example 2, the aluminum-plastic composite film prepared from the CPP film disclosed by the invention in example 1 is more resistant to deep drawing forming, and higher heat sealing strength can be obtained at a lower heat sealing temperature, which is related to the enhancement of the heat conductivity and toughness of the CPP due to the addition of the nano modified silicon dioxide with high heat conductivity; compared with the aluminum-plastic composite film prepared from the CPP film in example 3, the aluminum-plastic composite film prepared from the CPP film of the invention in example 1 has the advantages that the aluminum-plastic composite film in example 1 is more resistant to deep drawing forming, which is related to the use of high-temperature resistant silicone master batches; the aluminum-plastic composite film prepared using the CPP film of the present invention in example 1 was found to have a much greater AL// CPP peel strength than the CPP film prepared using the CPP film of example 4, which is related to the lower surface damage and higher efficiency of the corona-treated CPP compared to the plasma treatment.
To sum up, the plasma treatment layer of the CPP film of this application and the bonding strength reinforcing of aluminium foil, sandwich layer heat-conduction height, intensity and pliability increase, heat-seal layer surface friction coefficient is stable, makes the plastic-aluminum complex film of making have more resistant dashing deep shaping, change low temperature heat-seal, more electrolyte resistance performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the concept of the present invention, and these modifications and decorations should also be regarded as being within the protection scope of the present invention.
Claims (5)
1. A cast polypropylene film for an aluminum-plastic composite film is characterized in that the cast polypropylene film is obtained by casting three extrusion heads of a melting extruder in a three-layer co-extrusion mode, and sequentially comprises a plasma processing layer, a core layer and a heat sealing layer; the core layer is prepared from homopolymerized polypropylene, organic modified nano silicon dioxide and a polyolefin elastomer, and the composition proportion is 65-75%: 5-10%: 15-30%; the organic modified nano silicon dioxide mainly comprises the following preparation steps:
(1) preparing nano silicon dioxide:
preparing tetraethyl orthosilicate, ethanol and deionized water into a solution according to the volume ratio of 1:2:2 by adopting a sol-gel method, stirring the solution for 1h at 75 ℃ to mix the solution uniformly, adding hexadecylamine into the solution, keeping stirring the solution for 1h, controlling the pH value of the solution to be 6, and aging the solution at room temperature to prepare milky gel, wherein the volume ratio of tetraethyl orthosilicate to hexadecylamine is 3: 2; putting the prepared gel into a muffle furnace at 650 ℃ for high-temperature roasting for 1.5h to prepare nano silicon dioxide powder;
(2) activation of nano silicon dioxide:
placing the dried silicon dioxide in a sand bath under the protection of nitrogen and activating for 5 hours at the high temperature of 250 ℃ to obtain activated nano silicon dioxide;
(3) organic modification of nano-silica:
adding octanol into the activated nano-silica, heating and stirring at 120 ℃ for 1h under the catalysis of p-toluenesulfonic acid, refluxing for 1h, washing the product with absolute ethyl alcohol for 3 times, and drying to obtain organic modified nano-silica;
the mass ratio of the activated nano silicon dioxide to the octanol is 1: 5;
the mass ratio of the activated nano silicon dioxide to the toluenesulfonic acid is 25: 1.
2. The cast polypropylene film for the aluminum-plastic composite film according to claim 1, wherein the cast polypropylene film for the aluminum-plastic composite film has a total thickness of 30 to 80 μm, and the thickness ratio of the plasma treatment layer to the core layer to the heat seal layer is 1:3: 1.
3. The cast polypropylene film for the aluminum-plastic composite film according to claim 1, wherein the plasma treatment layer is made of random copolymer polypropylene, maleic anhydride modified polypropylene and polyolefin elastomer, and the composition ratio is 65-80%: 10-15%: 10 to 15 percent.
4. The cast polypropylene film for the aluminum-plastic composite film according to claim 1, wherein the heat seal layer is prepared from random or block copolymerization polypropylene, a polyolefin elastomer and a slipping agent, and the composition ratio is 70-80%: 15-25%: 1 to 5 percent.
5. The cast polypropylene film for the aluminum-plastic composite film according to claim 4, wherein the slipping agent in the heat seal layer is silicone master batch taking polypropylene as a carrier, the static friction coefficient of the surface of the heat seal layer is 0.12-0.2, the dynamic friction coefficient is 0.1-0.2, and the slipping agent comprises polypropylene random copolymer and silicone, wherein the mass ratio of the polypropylene random copolymer to the silicone is 1: 1.1.
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