CN114621524A - High-barrier film and preparation method thereof - Google Patents
High-barrier film and preparation method thereof Download PDFInfo
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- CN114621524A CN114621524A CN202210339456.5A CN202210339456A CN114621524A CN 114621524 A CN114621524 A CN 114621524A CN 202210339456 A CN202210339456 A CN 202210339456A CN 114621524 A CN114621524 A CN 114621524A
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- 238000002360 preparation method Methods 0.000 title claims description 12
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 230000004888 barrier function Effects 0.000 claims abstract description 20
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000004743 Polypropylene Substances 0.000 claims abstract description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000839 emulsion Substances 0.000 claims abstract description 10
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 10
- 239000004626 polylactic acid Substances 0.000 claims abstract description 10
- -1 polypropylene Polymers 0.000 claims abstract description 10
- 229920001155 polypropylene Polymers 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000000919 ceramic Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000006185 dispersion Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 40
- 239000000440 bentonite Substances 0.000 claims description 35
- 229910000278 bentonite Inorganic materials 0.000 claims description 35
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 230000005415 magnetization Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000009832 plasma treatment Methods 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 230000005495 cold plasma Effects 0.000 claims description 5
- 238000002242 deionisation method Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002715 modification method Methods 0.000 claims description 5
- 235000010333 potassium nitrate Nutrition 0.000 claims description 5
- 239000004323 potassium nitrate Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 235000012424 soybean oil Nutrition 0.000 claims description 5
- 239000003549 soybean oil Substances 0.000 claims description 5
- OXIKLRTYAYRAOE-CMDGGOBGSA-N (e)-3-(1-benzyl-3-pyridin-3-ylpyrazol-4-yl)prop-2-enoic acid Chemical group N1=C(C=2C=NC=CC=2)C(/C=C/C(=O)O)=CN1CC1=CC=CC=C1 OXIKLRTYAYRAOE-CMDGGOBGSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 2
- 230000002079 cooperative effect Effects 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 3
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000000752 ionisation method Methods 0.000 description 3
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; 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
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- 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
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- 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
- C08K3/346—Clay
-
- 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
- C08K9/00—Use of pretreated ingredients
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
Abstract
The invention provides a high-barrier film which comprises the following raw materials in parts by weight: 45-55 parts of polypropylene resin, 25-35 parts of acrylic emulsion, 5-10 parts of polylactic acid, 20-30 parts of modified bentonite and 5-10 parts of reaction auxiliary agent. According to the invention, the surface of the ceramic powder in the reaction auxiliary agent is subjected to dispersion treatment, so that the strength and toughness of the ceramic powder can be enhanced, the reaction auxiliary agent and the modified bentonite have a mutual and cooperative effect, and a high-barrier film formed under the coordination of the reaction auxiliary agent, the polypropylene resin, the acrylic emulsion and the polylactic acid has excellent flexibility and high barrier property.
Description
Technical Field
The invention relates to the technical field of barrier films, in particular to a high-barrier film and a preparation method thereof.
Background
The common high-barrier packaging materials in the market at present comprise aluminum foil, vacuum aluminum-plated film, EVOH, PVA, PVDC and the like. These materials have good barrier properties, but have their own distinct drawbacks. For example, aluminum foil has poor ductility, and is easy to form pinholes, which leads to reduction in barrier properties; the vacuum aluminizer has poor adhesive force and is not resistant to boiling; and the aluminum foil and the vacuum aluminum-plated film are opaque, so that the packaged contents cannot be seen, and simultaneously, the microwave heating cannot be carried out, so that the use of the aluminum foil and the vacuum aluminum-plated film is limited. The barrier property of EVOH and PVA is greatly influenced by the external humidity environment, and the barrier property is seriously reduced under the high-temperature and high-humidity environment. The PVDC coating film has yellow appearance color, and can generate carcinogenic dioxin in the subsequent incineration treatment process, which is objected by environmental protection personnel.
The existing high-barrier film is mostly modified and filled with bentonite to enhance the high barrier property of the film, the permeation of water molecules such as oxygen and the like is blocked by using a bentonite lamellar structure, but the hardness of the film after the bentonite modification is enhanced, the flexibility is poor, and the use effect is limited.
Disclosure of Invention
In view of the drawbacks of the prior art, it is an object of the present invention to provide a high barrier film and a method for preparing the same.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a high-barrier film which comprises the following raw materials in parts by weight:
45-55 parts of polypropylene resin, 25-35 parts of acrylic emulsion, 5-10 parts of polylactic acid, 20-30 parts of modified bentonite and 5-10 parts of reaction auxiliary agent;
the modification method of the modified bentonite comprises the following steps:
s1, bentonite pretreatment: sending the bentonite into deionized water for microwave dispersion, wherein the microwave power is 10-50W, the microwave time is 20-30min, then carrying out cold plasma treatment, the treatment power is 120-150W, the gas flow is 4-6L/min, and finishing the treatment;
s2, preparation of a flexibilizer: adding epoxidized soybean oil into a sodium carbonate solution with the mass fraction of 10-20%, then adding polyvinyl alcohol and an acetone solvent, stirring at the rotating speed of 20-100r/min for 20-30min, and obtaining a flexibilizer after the stirring is finished;
s3, bentonite flexibility treatment: feeding bentonite into a flexibilizer, stirring at low speed of 20-50r/min and 75-85 ℃ for 15-25min, washing with water, and drying;
s4, deionization: and (3) putting the bentonite into a potassium nitrate aqueous solution, soaking for 40-46min, then carrying out ionization treatment, wherein the ionization treatment power is 100-200W, the ionization time is 10-20min, and after the ionization is finished, washing and drying.
Preferably, the high barrier film comprises the following raw materials in parts by weight:
50 parts of polypropylene resin, 30 parts of acrylic emulsion, 7.5 parts of polylactic acid, 25 parts of modified bentonite and 7.5 parts of reaction auxiliary agent.
Preferably, the specific operation steps of the ionization treatment are as follows: under the conditions of the temperature of 51-55 ℃ and the pressure of 0.15-0.17MPa, firstly keeping the voltage of 142-148V and the current of 0.6-0.7A for ionization treatment for 7-9min, then reducing the voltage to 120-125V and the current of 0.2-0.5A, and continuing to ionize for 10-15 min.
Preferably, the preparation method of the reaction auxiliary agent comprises the following steps: grinding the ceramic into powder, feeding into a citric acid aqueous solution with the mass fraction of 4.5-4.9%, mixing, magnetizing, adding a silane coupling agent KH560, stirring at a low speed, and drying at the temperature of 91-95 ℃ until no water exists to obtain the reaction auxiliary agent.
Preferably, the magnetization treatment is carried out for 20-25min under the condition that the magnetic field intensity of the magnetization treatment is 1210-1250G.
Preferably, the magnetic field strength is 1230G, and the magnetization time is 22.5 min.
Preferably, the rotating speed of the low-speed stirring treatment is 20-100r/min, and the stirring time is 10-20 min.
The present invention also provides a method of making a high barrier film comprising the steps of: the raw materials are sequentially added into a stirrer to be stirred, the stirring speed is 50-150r/min, the stirring time is 20-30min, then the mixture is sent into a double-screw extruder to be extruded, the extrusion temperature is 125-135 ℃, and the extruded mixture is cooled to the room temperature to obtain the high-barrier film.
Compared with the prior art, the invention has the following beneficial effects:
the modified bentonite of the invention can improve the modified activation effect of the bentonite by pretreating the bentonite, dispersing the bentonite by microwave during pretreatment, and then cooling the bentonite by plasma treatment, so that the bentonite is more easily moistened by a flexibilizer, the flexibility of the bentonite after flexible treatment can be obviously improved, and ions in the bentonite are removed after ionization treatment, so that the polymerization degree is deteriorated, the lamella is more flexible, but the strength is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The high-barrier film of the embodiment comprises the following raw materials in parts by weight:
45 parts of polypropylene resin, 25 parts of acrylic emulsion, 5 parts of polylactic acid, 20 parts of modified bentonite and 5 parts of reaction auxiliary agent;
the modification method of the modified bentonite comprises the following steps:
s1, bentonite pretreatment: the bentonite is sent into deionized water for microwave dispersion, the microwave power is 10W, the microwave time is 20min, then cold plasma treatment is carried out, the treatment power is 120W, the gas flow is 4L/min, and the treatment is finished;
s2, preparation of a flexibilizer: adding epoxidized soybean oil into a sodium carbonate solution with the mass fraction of 10%, then adding polyvinyl alcohol and an acetone solvent, stirring at the rotating speed of 20r/min for 20min, and obtaining a flexibilizer after the stirring is finished;
s3, bentonite flexibility treatment: feeding bentonite into a flexibilizer, stirring at a low speed of 20r/min and 75 ℃ for 15min, washing with water, and drying;
s4, deionization: and (3) putting the bentonite into a potassium nitrate aqueous solution, soaking for 40min, then carrying out ionization treatment, wherein the ionization treatment power is 100W, the ionization time is 10min, and after the ionization is finished, washing and drying.
The specific operation steps of the ionization process in this embodiment are: under the conditions of 51 deg.C and 0.15MPa, maintaining the voltage at 142V and current at 0.6A for ionization for 7-9min, then reducing the voltage to 120V and current at 0.2A, and continuing ionization for 10 min.
The preparation method of the reaction promoter in this example is: grinding the ceramic into powder, feeding into a citric acid aqueous solution with the mass fraction of 4.5%, mixing, magnetizing, adding a silane coupling agent KH560, stirring at a low speed, and drying at the temperature of 91 ℃ until no water exists to obtain the reaction auxiliary agent.
The magnetization treatment of this example was carried out for 20min under the condition that the magnetic field strength was 1210G.
The rotation speed of the low-speed stirring treatment in this example was 20r/min, and the stirring time was 10 min.
A method of making a high barrier film of the present embodiment comprises the steps of: the raw materials are sequentially added into a stirrer to be stirred, the stirring speed is 50r/min, the stirring time is 20min, then the mixture is sent into a double-screw extruder to be extruded, the extrusion temperature is 125 ℃, and the high-barrier film is obtained after the extrusion and the cooling to the room temperature.
Example 2
The high-barrier film of the embodiment comprises the following raw materials in parts by weight:
55 parts of polypropylene resin, 35 parts of acrylic emulsion, 10 parts of polylactic acid, 30 parts of modified bentonite and 10 parts of reaction auxiliary agent;
the modification method of the modified bentonite comprises the following steps:
s1, bentonite pretreatment: the bentonite is sent into deionized water for microwave dispersion, the microwave power is 50W, the microwave time is 30min, then cold plasma treatment is carried out, the treatment power is 150W, the gas flow is 6L/min, and the treatment is finished;
s2, preparation of a flexibilizer: adding epoxidized soybean oil into a sodium carbonate solution with the mass fraction of 20%, then adding polyvinyl alcohol and an acetone solvent, stirring at the rotating speed of 100r/min for 30min, and obtaining a flexibilizer after the stirring is finished;
s3, bentonite flexibility treatment: feeding bentonite into a flexibilizer, stirring at a low speed of 50r/min and 85 ℃ for 25min, washing with water, and drying;
s4, deionization: and (3) putting the bentonite into a potassium nitrate aqueous solution, soaking for 46min, then carrying out ionization treatment, wherein the ionization treatment power is 200W, the ionization time is 20min, and after the ionization is finished, washing and drying.
The high barrier film of the present example comprises the following raw materials in parts by weight:
50 parts of polypropylene resin, 30 parts of acrylic emulsion, 7.5 parts of polylactic acid, 25 parts of modified bentonite and 7.5 parts of reaction auxiliary agent.
The specific operation steps of the ionization process in this embodiment are: keeping the voltage at 148V and the current at 0.7A under the conditions of 55 deg.C and 0.17MPa for ionization for 9min, then reducing the voltage to 125V and the current at 0.5A, and continuing ionization for 15 min.
The preparation method of the reaction promoter in this example is: grinding the ceramic into powder, feeding into a citric acid aqueous solution with the mass fraction of 4.9%, mixing, magnetizing, then adding a silane coupling agent KH560, stirring at a low speed, and finally drying at the temperature of 95 ℃ until no moisture exists to obtain the reaction auxiliary agent.
The magnetization treatment of this example was carried out for 25min under the condition that the magnetic field strength was 1250G.
The rotation speed of the low-speed stirring treatment in this example was 100r/min, and the stirring time was 20 min.
A method of making a high barrier film of the present embodiment comprises the steps of: the raw materials are sequentially added into a stirrer to be stirred, the stirring speed is 150r/min, the stirring time is 30min, then the mixture is sent into a double-screw extruder to be extruded, the extrusion temperature is 135 ℃, and the high-barrier film is obtained after being cooled to the room temperature after being extruded.
Example 3
The high-barrier film of the embodiment comprises the following raw materials in parts by weight:
50 parts of polypropylene resin, 30 parts of acrylic emulsion, 7.5 parts of polylactic acid, 25 parts of modified bentonite and 7.5 parts of reaction auxiliary agent;
the modification method of the modified bentonite comprises the following steps:
s1, bentonite pretreatment: the bentonite is sent into deionized water for microwave dispersion, the microwave power is 30W, the microwave time is 25min, then cold plasma treatment is carried out, the treatment power is 135W, the gas flow is 5L/min, and the treatment is finished;
s2, preparation of a flexibilizer: adding epoxidized soybean oil into a sodium carbonate solution with the mass fraction of 15%, then adding polyvinyl alcohol and an acetone solvent, stirring at the rotating speed of 60r/min for 25min, and obtaining a flexibilizer after the stirring is finished;
s3, bentonite flexibility treatment: feeding bentonite into a flexibilizer, stirring at a low speed of 35r/min and 80 ℃ for 20min, washing with water, and drying;
s4, deionization: and (3) putting the bentonite into a potassium nitrate aqueous solution, soaking for 43min, then carrying out ionization treatment, wherein the ionization treatment power is 150W, the ionization time is 15min, and after the ionization is finished, washing and drying.
The specific operation steps of the ionization process in this embodiment are: under the conditions of 53 deg.C and 0.16MPa, maintaining the voltage at 145V and current at 0.65A for ionization for 8min, then reducing the voltage to 122.5V and current at 0.35A, and continuing ionization for 12.5 min.
The preparation method of the reaction promoter in this example is: grinding the ceramic into powder, feeding into a citric acid aqueous solution with the mass fraction of 4.7%, mixing, magnetizing, adding a silane coupling agent KH560, stirring at a low speed, and drying at the temperature of 93 ℃ until the water is free to obtain the reaction auxiliary agent.
The magnetization treatment of this example was carried out for 22.5min under the condition that the magnetic field strength was 1230G.
In the present example, the rotation speed of the low-speed stirring treatment was 60r/min, and the stirring time was 15 min.
A method of making a high barrier film of the present embodiment comprises the steps of: the raw materials are sequentially added into a stirrer to be stirred, the stirring speed is 100r/min, the stirring time is 25min, then the mixture is sent into a double-screw extruder to be extruded, the extrusion temperature is 130 ℃, and the extruded mixture is cooled to the room temperature to obtain the high-barrier film.
Comparative example 1
A commercially available EVOH film was used.
The products of examples 1 to 3 and comparative example 1 were compared in performance tests to obtain elongation at break and improvement in oxygen transmission;
| group of | Elongation at Break (%) | Oxygen permeability improvement (%) |
| Example 1 | 34.2 | 30.5 |
| Example 2 | 34.6 | 30.7 |
| Example 3 | 35.5 | 31.2 |
| Comparative example 1 | 26.2 | 21.3 |
The elongation at break and the oxygen transmission improvement rate of the product can respectively reach more than 35.5 percent and 31.2 percent, so that the flexibility and the high barrier property of the product are obviously improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The high-barrier film is characterized by comprising the following raw materials in parts by weight:
45-55 parts of polypropylene resin, 25-35 parts of acrylic emulsion, 5-10 parts of polylactic acid, 20-30 parts of modified bentonite and 5-10 parts of reaction auxiliary agent;
the modification method of the modified bentonite comprises the following steps:
s1, bentonite pretreatment: sending the bentonite into deionized water for microwave dispersion, wherein the microwave power is 10-50W, the microwave time is 20-30min, then carrying out cold plasma treatment, the treatment power is 120-150W, the gas flow is 4-6L/min, and finishing the treatment;
s2, preparation of a flexibilizer: adding epoxidized soybean oil into a sodium carbonate solution with the mass fraction of 10-20%, then adding polyvinyl alcohol and an acetone solvent, stirring at the rotating speed of 20-100r/min for 20-30min, and obtaining a flexibilizer after the stirring is finished;
s3, bentonite flexibility treatment: feeding bentonite into a flexibilizer, stirring at low speed of 20-50r/min and 75-85 ℃ for 15-25min, washing with water, and drying;
s4, deionization: and (3) putting the bentonite into a potassium nitrate aqueous solution, soaking for 40-46min, then carrying out ionization treatment, wherein the ionization treatment power is 100-200W, the ionization time is 10-20min, and after the ionization is finished, washing and drying.
2. The high barrier film according to claim 1, comprising the following raw materials in parts by weight:
50 parts of polypropylene resin, 30 parts of acrylic emulsion, 7.5 parts of polylactic acid, 25 parts of modified bentonite and 7.5 parts of reaction auxiliary agent.
3. The high barrier film according to claim 1, wherein the specific operation steps of the ionization treatment are as follows: under the conditions of the temperature of 51-55 ℃ and the pressure of 0.15-0.17MPa, firstly keeping the voltage of 142-148V and the current of 0.6-0.7A for ionization treatment for 7-9min, then reducing the voltage to 120-125V and the current of 0.2-0.5A, and continuing to ionize for 10-15 min.
4. The high barrier film of claim 1, wherein the reaction auxiliary is prepared by the following steps: grinding the ceramic into powder, feeding into a citric acid aqueous solution with the mass fraction of 4.5-4.9%, mixing, magnetizing, adding a silane coupling agent KH560, stirring at a low speed, and drying at the temperature of 91-95 ℃ until no water exists to obtain the reaction auxiliary agent.
5. The film as claimed in claim 4, wherein the magnetization treatment is carried out for 20-25min under the condition of magnetic field strength of 1210-1250G.
6. The high barrier film of claim 5, wherein said magnetic field strength is 1230G and magnetization time is 22.5 min.
7. The film as claimed in claim 4, wherein the rotation speed of the low speed stirring process is 20-100r/min, and the stirring time is 10-20 min.
8. A method for preparing a high barrier film according to any one of claims 1 to 7, comprising the steps of: the raw materials are sequentially added into a stirrer to be stirred, the stirring speed is 50-150r/min, the stirring time is 20-30min, then the mixture is sent into a double-screw extruder to be extruded, the extrusion temperature is 125-135 ℃, and the extruded mixture is cooled to the room temperature to obtain the high-barrier film.
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