CN116769206B - Polylactic acid film with high barrier property and preparation method thereof - Google Patents
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- 230000004888 barrier function Effects 0.000 title claims abstract description 38
- 229920006381 polylactic acid film Polymers 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 60
- 239000004626 polylactic acid Substances 0.000 claims abstract description 60
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000137 annealing Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000001291 vacuum drying Methods 0.000 claims abstract description 14
- 230000003179 granulation Effects 0.000 claims abstract description 12
- 238000005469 granulation Methods 0.000 claims abstract description 12
- 238000007731 hot pressing Methods 0.000 claims abstract description 11
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 239000003960 organic solvent Substances 0.000 claims abstract description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 abstract description 8
- 239000001301 oxygen Substances 0.000 abstract description 8
- 239000002131 composite material Substances 0.000 abstract description 5
- 230000002776 aggregation Effects 0.000 abstract description 4
- 229920000642 polymer Polymers 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005054 agglomeration Methods 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 229920006280 packaging film Polymers 0.000 description 4
- 239000012785 packaging film Substances 0.000 description 4
- 238000001132 ultrasonic dispersion Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229920006238 degradable plastic Polymers 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229920006254 polymer film Polymers 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920001896 polybutyrate Polymers 0.000 description 2
- 239000011165 3D composite Substances 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical group [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006126 semicrystalline polymer Polymers 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention relates to the technical field of polymer composite materials, and discloses a polylactic acid film with high barrier property and a preparation method thereof, wherein the preparation method comprises the following steps of 1: uniformly mixing graphene oxide with an organic solvent, adding a silane coupling agent to perform a grafting reaction with the graphene oxide, then adding polylactic acid to continue the reaction, and washing, filtering and vacuum drying to obtain modified graphene oxide; step 2: uniformly mixing the modified graphene oxide and the L-polylactic acid according to the weight ratio of 1:9-1:99, carrying out melt blending granulation, water cooling, granulating, vacuum drying by a double-screw extruder, carrying out hot pressing film formation by a flat vulcanizing machine, and carrying out annealing to obtain the high-barrier polylactic acid film. The graphene oxide produced by the method can effectively avoid agglomeration in the processing process, reduce the processing flow and the cost, and the prepared polylactic acid film improves the barrier property of water vapor and oxygen.
Description
Technical Field
The invention relates to the technical field of polymer composite materials, in particular to a polylactic acid film with high barrier property and a preparation method thereof.
Background
Due to the widespread use of petroleum-based traditional plastic packaging films, waste packaging films have caused serious "white pollution" to the ecological environment. Along with the promotion of national policy and the enhancement of environmental awareness of people, the development of degradable plastics to replace traditional plastics is urgent, and polylactic acid materials can be biologically degraded after being used and abandoned due to renewable raw material sources, and have good mechanical strength and are widely used, but the barrier property of polylactic acid materials to water vapor is poor, so that the application and development of polylactic acid in packaging films are limited. Polylactic acid has different configurations due to different configurations of lactic acid: l-polylactic acid, D-polylactic acid and racemic polylactic acid. Polylactic acid with different configurations has different physical properties, racemic polylactic acid cannot be crystallized due to disorder of molecular chains, and the left-handed polylactic acid and the right-handed polylactic acid belong to semi-crystalline polymers, after complete crystallization, the crystallinity can reach 50%, and the right-handed polylactic acid and the left-handed polylactic acid can be blended to form an established composite crystal.
The nano-filler composite technology is one of the effective means widely used at present for improving the barrier property of polymer films. The nanofiller can be used as a 'barrier' in the film due to the impermeability of the nanofiller, so that the permeation path of gas molecules in the film is prolonged, and the barrier property of the polymer film is greatly improved. The intrinsic properties of the nanofiller and the dispersibility of the nanofiller in the polymer are key factors affecting the barrier properties of the polymer film.
Graphene oxide is used as a nano lamellar filler, has a large specific surface area and has good dispersibility in a polar solvent. In addition, the graphene oxide has a two-dimensional lamellar structure, so that the permeation path of gas in the film can be effectively prolonged compared with nano spherical filler and rod-shaped filler, and the barrier property of the film is improved to the greatest extent.
Patent application CN112280261a discloses a full-biodegradable high-barrier PLA/PBAT composite packaging film, and degradable plastics, modified graphene oxide and modified nano silicon dioxide are blended through multiple blending granulation. Patent application CN114789591A discloses a preparation process of an ecological friendly multilayer co-extrusion packaging bag, wherein PBAT and modified nano calcium carbonate are used as barrier layers. Patent application CN116199924A discloses a preparation method of an efficient GO/PLA layer-by-layer self-assembled barrier film, and graphene oxide is deposited on the surface of a polylactic acid film by virtue of an electric field effect, so that the barrier property of the polylactic acid film is improved. The method can improve the barrier property of the polylactic acid film to a certain extent, but the nano filler is directly blended with the degradable plastic, so that the agglomeration of the nano filler cannot be effectively avoided. In addition, the preparation flow is prolonged by the multiple blending granulation, multilayer coextrusion and electric field deposition technologies, and the cost is greatly increased. The electric field deposition technique also sacrifices the transparency of the film, limiting the range of applications of the film in packaging.
Disclosure of Invention
Aiming at the problems, the preparation method for the polylactic acid film has the advantages that in order to reduce the preparation flow, reduce the cost, improve the interaction between the graphene oxide and the polylactic acid, avoid the aggregation of the graphene oxide caused by direct blending of the polylactic acid and the graphene oxide, and improve the barrier property of the polylactic acid film by utilizing the characteristic that the graphene oxide can be used as a heterogeneous nucleation point to promote the crystallization of the polylactic acid, so that the preparation method for the polylactic acid film with high barrier property is provided.
The invention adopts the following technical scheme:
a preparation method of a polylactic acid film with high barrier property comprises the following steps:
step 1: uniformly mixing 0.1-1 g of graphene oxide with an organic solvent, adding 0.5-8.0 g of silane coupling agent KH560 to perform grafting reaction with the graphene oxide, heating to 60 ℃, and reacting for 6 hours; then adding 5.0-20.0 g of polylactic acid for continuous reaction, and obtaining modified graphene oxide after washing, filtering and vacuum drying;
step 2: uniformly mixing the modified graphene oxide and the L-polylactic acid according to the weight ratio of 1:9-1:99, carrying out melt blending granulation, water cooling, granulating, vacuum drying by a double-screw extruder, carrying out hot pressing film formation by a flat vulcanizing machine, and carrying out annealing to obtain the high-barrier polylactic acid film.
Further, the polylactic acid in the step 1 is any one of the l-polylactic acid and the d-polylactic acid.
Further, the working parameters of the twin-screw extruder are as follows: the rotation speed is 60-100 rpm at 140-180 ℃.
Further, the working parameters of the flat vulcanizing machine are as follows: the temperature is 190-240 ℃, the pressure is 0-10 MPa, and the time is 1-10 min.
Further, the annealing process parameter in the step 2 is 120 ℃ for 30min.
In another aspect, the invention provides a high-barrier polylactic acid film, which is prepared by a preparation method comprising the following steps:
step 1: uniformly mixing 0.5g of graphene oxide with an organic solvent, adding 4.0g of silane coupling agent KH560 to perform grafting reaction with the graphene oxide, adding 20.0g of polylactic acid dissolved by N, N-dimethylformamide to continuously react, washing, filtering and drying in vacuum to obtain modified graphene oxide;
step 2: uniformly mixing 4 parts of modified graphene oxide and 96 parts of L-polylactic acid, performing melt blending granulation, water cooling, granulating, vacuum drying by a double-screw extruder, performing hot pressing film formation by a flat vulcanizing machine, and performing annealing to obtain the high-barrier polylactic acid film.
In another aspect, the invention provides an application of the high-barrier polylactic acid film in food packaging.
The beneficial effects of the invention are as follows:
the high-barrier polylactic acid film PLLA/(PLLA-g-GO) and PLLA/(PDLA-g-GO) prepared by the invention improve the barrier property of water vapor and oxygen, and the special silicon oxygen group and epoxy group of the silane coupling agent KH560 can react with graphene oxide and polylactic acid respectively, so that the polylactic acid is grafted on the surface of the graphene oxide, the compatibility between the graphene oxide and the polylactic acid is improved, the dispersibility of the graphene oxide in the polylactic acid is improved, the aggregation phenomenon of the graphene oxide in the processing process is effectively prevented, and the better the dispersion of the graphene oxide is, the better the barrier property is expressed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present invention and are not limiting of the present invention.
FIG. 1 is a schematic diagram of a first temperature rise curve of a DSC of the PLLA, PLLA/(PLLA/GO), PLLA/(PLLA-g-GO), PLLA/(PDLA-g-GO) of the invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
The invention will be further described with reference to the drawings and examples.
A preparation method of a polylactic acid film with high barrier property comprises the following steps:
step 1: uniformly mixing 0.1-1 g of graphene oxide with an organic solvent, adding 0.5-8.0 g of silane coupling agent KH560 to perform grafting reaction with the graphene oxide, heating to 60 ℃, and reacting for 6 hours; and then adding 5.0-20.0 g of polylactic acid for continuous reaction, and obtaining the modified graphene oxide after washing, filtering and vacuum drying.
Step 2: uniformly mixing the modified graphene oxide and the L-polylactic acid according to the weight ratio of 1:9-1:99, carrying out melt blending granulation, water cooling, granulating, vacuum drying by a double-screw extruder, carrying out hot pressing film formation by a flat vulcanizing machine, and carrying out annealing to obtain a high-barrier polylactic acid film;
the working parameters of the double-screw extruder are as follows: 140-180 ℃ and the rotating speed is 60-100 rpm;
the working parameters of the flat vulcanizing machine are as follows: the temperature is 190-240 ℃, the pressure is 0-10 MPa, and the time is 1-10 min;
the annealing process parameters in the step 2 are 120 ℃ and 30min.
The method comprises the following specific steps:
step 1: adding 0.5g of graphene oxide and 200ml of ethanol solution into a three-necked flask, performing ultrasonic dispersion for 1h, adding 4g of silane coupling agent KH560, heating to 60 ℃, and reacting for 6h; and adding 20g of polylactic acid dissolved by N, N-dimethylformamide, and continuously reacting for 6 hours at room temperature, washing, filtering and drying in vacuum to obtain the modified graphene oxide.
Step 2: after 4 parts of modified graphene oxide and 96 parts of L-polylactic acid are uniformly mixed, melt blending granulation is carried out through a double-screw extruder, water cooling, granulating, vacuum drying is carried out, and hot pressing is carried out through a flat vulcanizing machine to obtain the high-barrier modified polylactic acid film. The working parameters of the double screw extruder are as follows: 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 180 ℃ and the rotation speed is 100rpm. The working parameters of the vulcanizing press are as follows: the temperature is 230 ℃, the pressure is 10MPa, and the time is 7min. The working parameters of the annealing process are as follows: 120 ℃ for 30min.
Example 1:
step 1: adding 0.5g of graphene oxide and 200ml of ethanol solution into a three-necked flask, performing ultrasonic dispersion for 1h, slowly adding 4g of silane coupling agent KH560, heating to 60 ℃, and reacting for 6h; and adding 20g of L-polylactic acid dissolved by N, N-dimethylformamide, continuously reacting for 6 hours at room temperature, washing, filtering and drying in vacuum to obtain the L-polylactic acid modified graphene oxide.
Step 2: and uniformly mixing the L-polylactic acid modified graphene oxide and the L-polylactic acid according to the proportion of 4:96, performing melt blending granulation through a double screw extruder, performing water cooling, granulating, performing vacuum drying, performing hot pressing through a flat vulcanizing machine, and performing annealing to obtain the L-polylactic acid modified graphene oxide/L-polylactic acid film (PLLA/(PLLA-g-GO)). The working parameters of the double screw extruder are as follows: 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 180 ℃ and the rotation speed is 100rpm. The working parameters of the vulcanizing press are as follows: the temperature is 180-230 ℃, the pressure is 10MPa, and the time is 7min. The working parameters of the annealing process are as follows: 120 ℃ for 30min.
Example 2
Step 1: adding 0.5g of graphene oxide and 200ml of ethanol solution into a three-necked flask, performing ultrasonic dispersion for 1h, slowly adding 4g of silane coupling agent KH560, heating to 60 ℃, and reacting for 6h; and adding 20g of dextrorotatory polylactic acid dissolved by N, N-dimethylformamide, continuously reacting for 6 hours at room temperature, washing, filtering and drying in vacuum to obtain the dextrorotatory polylactic acid modified graphene oxide.
Step 2: and uniformly mixing the right-handed polylactic acid modified graphene oxide and the left-handed polylactic acid in a ratio of 4:96, performing melt blending granulation through a double-screw extruder, performing water cooling, granulating, performing vacuum drying, performing hot pressing through a flat vulcanizing machine, and performing annealing to obtain the right-handed polylactic acid modified graphene oxide/left-handed polylactic acid film (PLLA/(PDLA-g-GO)). The working parameters of the double screw extruder are as follows: 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 180 ℃ and the rotation speed is 100rpm. The working parameters of the vulcanizing press are as follows: the temperature is 180-230 ℃, the pressure is 10MPa, and the time is 7min. The working parameters of the annealing process are as follows: 120 ℃ for 30min.
Comparative example 1
And (3) carrying out hot pressing on the L-polylactic acid particles by a flat vulcanizing machine, and annealing to obtain the L-polylactic acid film (PLLA). The working parameters of the vulcanizing press are as follows: the temperature is 180-230 ℃, the pressure is 10MPa, and the time is 7min. The working parameters of the annealing process are as follows: 120 ℃ for 30min.
Comparative example 2
Step 1: adding 0.5g of graphene oxide and 200ml of ethanol solution into a three-necked flask, performing ultrasonic dispersion for 1h, then adding 20g of L-polylactic acid dissolved by N, N-dimethylformamide, washing, filtering and drying in vacuum to obtain the L-polylactic acid graphene oxide.
Step 2: uniformly mixing the left-handed polylactic acid graphene oxide and the left-handed polylactic acid according to the proportion of 4:96, carrying out melt blending granulation by a double-screw extruder, carrying out water cooling, granulating, carrying out vacuum drying, carrying out hot pressing by a flat vulcanizing machine, and annealing to obtain the graphene oxide/polylactic acid film (PLLA/(PLLA/GO)). The working parameters of the double screw extruder are as follows: 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 180 ℃ and the rotation speed is 100rpm. The working parameters of the vulcanizing press are as follows: the temperature is 180-230 ℃, the pressure is 10MPa, and the time is 7min. The working parameters of the annealing process are as follows: 120 ℃ for 30min.
DSC characterization tests and barrier property tests were performed on PLLA/(PLLA-g-GO), PLLA/(PDLA-g-GO), PLLA/(PLLA/GO) obtained in example 1, example 2, comparative example 1 and comparative example 2, respectively, and the barrier property tests included a water vapor barrier property test and an oxygen barrier property test, the water vapor barrier property test was performed in accordance with "GB/T1037-2021", and the oxygen barrier property was performed in accordance with "GB/T1038.1-2022".
From the barrier property test, the water vapor transmission coefficient of PLLA/(PLLA/GO) compared with PLLA is 4.10X10 -14 g·cm/cm 2 s.Pa has fallen to 2.83×10 -14 g·cm/cm 2 s.Pa, oxygen permeability coefficient of 0.86×10 -14 cm 3 ·cm/cm 2 s.Pa has fallen to 0.53X10 -14 cm 3 ·cm/cm 2 s.Pa; the water vapor transmission coefficient of PLLA/(PLLA-g-GO) is from 2.83×10 compared with PLLA/(PLLA/GO) -14 g·cm/cm 2 s.Pa has fallen to 2.71×10 -14 g·cm/cm 2 s.Pa, oxygen permeability coefficient of 0.53X10 -14 cm 3 ·cm/cm 2 s.Pa has fallen to 0.48X10 -14 cm 3 ·cm/cm 2 s.Pa; the water vapor transmission coefficient of PLLA/(PDLA-g-GO) is from 2.83×10 compared with PLLA/(PLLA/GO) -14 g·cm/cm 2 s.Pa has fallen to 2.44X10 -14 g·cm/cm 2 s.Pa, oxygen permeability coefficient of 0.53X10 - 14 cm 3 ·cm/cm 2 s.Pa has fallen to 0.40X10 -14 cm 3 ·cm/cm 2 As is clear from the above, the modified polylactic acid films PLLA/(PLLA-g-GO) and PLLA/(PDLA-g-GO) have high barrier properties against water vapor and oxygen.
As shown in FIG. 1, DSC curve shows that the D-polylactic acid grafted graphene oxide/polylactic acid film contains a stereocomplex crystal, and a melting peak appears at 210-230 ℃ in the DSC curve of PLLA/(PDLA-g-GO), and the melting peak corresponds to the melting peak of the stereocomplex crystal. The interaction between the right-handed polylactic acid modified graphene oxide and the left-handed polylactic acid is enhanced by the three-dimensional composite crystal, so that the barrier property of the film is improved, and the high-barrier polylactic acid film is applied to food packaging.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The preparation method of the polylactic acid film with high barrier property is characterized by comprising the following steps:
step 1: uniformly mixing 0.1-1 g of graphene oxide with an organic solvent, adding 0.5-8.0 g of silane coupling agent KH560 to perform grafting reaction with the graphene oxide, heating to 60 ℃, and reacting for 6 hours; then adding 5.0-20.0 g of polylactic acid for continuous reaction, and obtaining modified graphene oxide after washing, filtering and vacuum drying;
step 2: uniformly mixing the modified graphene oxide and the L-polylactic acid according to the weight ratio of 1:9-1:99, carrying out melt blending granulation, water cooling, granulating, vacuum drying by a double-screw extruder, carrying out hot pressing film formation by a flat vulcanizing machine, and carrying out annealing to obtain the high-barrier polylactic acid film.
2. The method for preparing the polylactic acid film with high barrier property according to claim 1, wherein the polylactic acid in the step 1 is any one of L-polylactic acid and D-polylactic acid.
3. The method for preparing the polylactic acid film with high barrier property according to claim 1, wherein the working parameters of the twin-screw extruder are as follows: the rotation speed is 60-100 rpm at 140-180 ℃.
4. The method for preparing the polylactic acid film with high barrier property according to claim 1, wherein the working parameters of the press vulcanizer are as follows: the temperature is 190-240 ℃, the pressure is 0-10 MPa, and the time is 1-10 min.
5. The method for preparing a polylactic acid film with high barrier property according to claim 1, wherein the annealing process parameter in the step 2 is 120 ℃ for 30min.
6. A high barrier polylactic acid film prepared by the preparation method according to any one of claims 1 to 5.
7. The polylactic acid film with high barrier property is characterized by being prepared by a preparation method comprising the following steps of:
step 1: uniformly mixing 0.5g of graphene oxide with an organic solvent, adding 4.0g of silane coupling agent KH560 to perform grafting reaction with the graphene oxide, adding 20.0g of polylactic acid dissolved by N, N-dimethylformamide to continuously react, washing, filtering and drying in vacuum to obtain modified graphene oxide;
step 2: uniformly mixing 4 parts of modified graphene oxide and 96 parts of L-polylactic acid, performing melt blending granulation, water cooling, granulating, vacuum drying by a double-screw extruder, performing hot pressing film formation by a flat vulcanizing machine, and performing annealing to obtain the high-barrier polylactic acid film.
8. Use of the high barrier polylactic acid film obtained by the preparation method according to any one of claims 1 to 5 in food packaging.
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