CN116218152A - Preparation method of starch-based material with barrier property - Google Patents

Preparation method of starch-based material with barrier property Download PDF

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CN116218152A
CN116218152A CN202310254946.XA CN202310254946A CN116218152A CN 116218152 A CN116218152 A CN 116218152A CN 202310254946 A CN202310254946 A CN 202310254946A CN 116218152 A CN116218152 A CN 116218152A
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starch
ppc
pla
based material
barrier property
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朱玉正
李刚
侯昭升
张�浩
孙晨
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Shandong Tianming Medical Technology Co ltd
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Shandong Tianming Medical Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B31/00—Preparation of derivatives of starch
    • C08B31/18—Oxidised starch
    • C08B31/185—Derivatives of oxidised starch, e.g. crosslinked oxidised starch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/64—Polyesters containing both carboxylic ester groups and carbonate groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/04—Starch derivatives, e.g. crosslinked derivatives
    • C08L3/10—Oxidised starch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/06—Biodegradable
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/14—Gas barrier composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a preparation method of a starch-based material with barrier property. The invention prepares the polyester PPC-PLA by melting and copolymerizing the poly propylene carbonate polyol and the lactide, obtains AA-ST by carrying out radical modification on oxidized starch by amino acid, and then carries out banburying extrusion on the poly propylene carbonate polyol and the lactide to obtain the starch-based degradable material PPC-PLA-ST. The PPC not only improves the stretchability and the impact resistance of the starch, but also ensures that the material has certain barrier property, the mechanical strength of the material is enhanced by adding the polylactide, the material has good biocompatibility by adding the amino acid, and the crosslinking degree between the starch and the polyester is improved by the dicarboxyl and the amino, so that the prepared product has good barrier property, good mechanical property and biocompatibility, can be completely degraded, and can be used in the industries of food film packaging, mulch films and medicines.

Description

Preparation method of starch-based material with barrier property
Technical Field
The invention belongs to the technical field of bio-based polymer materials, and particularly relates to a preparation method of a starch-based material with barrier property.
Background
Since the invention of the 20 th century, plastics have been widely used because of their good properties, wherein plastic packaging materials are most rapidly developed, and plastic packaging materials account for 41% of household garbage, which is "permanently" non-degradable, so that the development of naturally degradable plastic products to replace common plastics is a current research focus. Starch is a natural degradable high molecular material, can be broken into monosaccharides such as glucose and other small molecular compounds under the action of microorganisms, is finally metabolized into water and carbon dioxide, is renewable and low in cost, and is a powerful substitute for non-degradable petroleum-based materials. At present, starch can have thermoplastic property by adding a small molecular plasticizer or a compatilizer, and along with the migration of small molecular substances, the safety of the starch cannot be ensured.
The carbon dioxide copolymer is a generic name of a polymer formed by copolymerization of carbon dioxide and other copolymerizable monomers, and the synthesis of the carbon dioxide copolymer starts from the work published in the Japanese science home in auspicious 1696 years. At present, a large number of polymers are researched, wherein the polymers are generated by copolymerizing carbon dioxide and epoxide, the carbon dioxide and the propylene oxide are polymerized to generate polypropylene carbonate (PPC) under the action of a catalyst, and the PPC is used as novel aliphatic polyester, has good degradation performance and barrier property, is transparent and nontoxic, and has good prospect in the aspects of food packaging, medical materials and engineering plastics.
Patent CN111607209a discloses a high-performance polypropylene carbonate composition and a preparation method thereof, which is prepared by blending clay, starch compound and polypropylene carbonate resin, can improve the thermal stability of the composition, is environment-friendly, but has the defect of poor compatibility of starch and polypropylene carbonate, and poor mechanical property of the composition.
Therefore, it is necessary to provide a material which maintains the excellent barrier properties of polycarbonate, has certain mechanical properties, and is inexpensive.
Disclosure of Invention
The invention provides a preparation method of a starch-based material with barrier property, aiming at the problems existing in the prior art. The invention prepares the polyester PPC-PLA by melting and copolymerizing the poly propylene carbonate polyol and the lactide, obtains AA-ST by carrying out radical modification on oxidized starch by amino acid, and then carries out banburying extrusion on the poly propylene carbonate polyol and the lactide to obtain the starch-based degradable material PPC-PLA-ST. The PPC not only improves the stretchability and the impact resistance of the starch, but also ensures that the material has certain barrier property, the mechanical strength of the material is enhanced by adding the polylactide, the material has good biocompatibility by adding the amino acid, and the crosslinking degree between the starch and the polyester is improved by the dicarboxyl and the amino, so that the prepared product has good barrier property, good mechanical property and biocompatibility, can be completely degraded, and can be used in the industries of food film packaging, mulch films and medicines.
The technical scheme of the invention is as follows: the preparation method of the starch-based material with barrier property is characterized by comprising the following steps of:
1) Taking polypropylene carbonate polyol (PPC) and Lactide (LA) as raw materials, catalyzing the raw materials by a catalyst, carrying out copolymerization reaction for 12-48 hours at the temperature of 100-140 ℃ under normal pressure to obtain solid polyester PPC-PLA, and crushing the solid polyester PPC-PLA by a crusher to obtain PPC-PLA particles;
2) Dissolving oxidized starch and amino acid in water, heating to 40-80 ℃ under stirring to react to obtain AA-ST, drying to remove water, and grinding to obtain AA-ST powder with the particle size of more than 100 meshes;
3) And carrying out banburying extrusion on the AA-ST powder and the PPC-PLA particles in a screw extruder to obtain the starch-based degradable material PPC-PLA-ST.
The preparation of the above steps 1) -3) and the schematic diagram of the product structure are shown in FIG. 1. The connectivity between the starch and the polyester is enhanced by the method of crosslinking amino acid, and the compatibility is increased, so that the mechanical property of the material is greatly enhanced.
Preferably, the step 1) polypropylene carbonate polyol is one of polypropylene carbonate diol (PPC), polypropylene carbonate triol (3-PPC), polypropylene carbonate tetraol (4-PPC), more preferably PPC; the molecular weight is 500-10000 g/mol, more preferably the molecular weight of the polycarbonate polyol is 3000-8000 g/mol.
Preferably, the molar ratio of the polypropylene carbonate polyol to the lactide of step 1) is 1:10-100, more preferably the molar ratio of polycarbonate polyol to lactide is 1:30-60.
Preferably, the catalyst in the step 1) is a tin compound, more preferably stannous octoate, and the addition amount is 0.01-0.3 wt% of the total mass of the raw materials in the step 1).
Preferably, the starch of step 2) has an oxidation degree of 10-60%; the amino acid is one or two of glutamic acid and aspartic acid.
Preferably, the mass ratio of oxidized starch to amino acid in step 2) is 100:10-50.
Preferably, the reaction time of step 2) is from 0.5 to 3 hours.
Preferably, the mass ratio of AA-ST to PPC-PLA in the step 3) is 100:80-200.
Preferably, the banburying conditions in the step 3) are as follows: the banburying temperature of the screw extruder is 140-200 ℃, the banburying rotating speed is 20-80rpm, and the banburying time is 3-10min.
The barrier starch-based material prepared by the method is characterized in that the mass content of starch in the material PPC-PLA-ST is 30-50%.
The barrier starch-based material prepared by the method can be completely degraded (the degradation time is less than or equal to 24 days), and the breaking strength is high>27MPa, elongation at break>121%, water vapor transmission rate of less than 134g/m 2 Per 24 hours, the oxygen transmittance is less than 185cm 3 /m 2 /d/atm, thus in packaging, agricultureAnd the fields of medical treatment and the like have wide application prospect.
The invention has the following beneficial effects:
1. in the product of the invention, the PPC is added to improve the stretchability and the impact resistance of the starch, the material has a certain barrier property, the added polylactide enhances the mechanical strength of the material, the product has better mechanical properties, the amino acid is added to ensure that the material has good biocompatibility (the material has good compatibility without adding other small molecular plasticizers, coupling agents and dispersing agents), and the crosslinking degree between the starch and the polyester is improved through the dicarboxyl and the amino groups, so that the starch content can be improved, and the cost can be reduced.
2. The material of the invention does not use small molecular additives in the preparation process, all the raw materials can be fully degraded, and the product has certain barrier property, so the material can be used for manufacturing various tableware, packaging materials which directly contact food, medical materials, agricultural films and the like, the product is green and degradable, and the degradation products are harmless to human bodies.
3. Compared with the traditional method, the preparation method disclosed by the invention has the advantages of simple process, no need of organic solvent for treatment, no need of other small-molecule additives, higher starch content, wide sources and low cost, and is suitable for large-scale production.
Drawings
FIG. 1 is a schematic diagram of the preparation of a starch-based material with barrier properties and the structure of the product according to the present invention;
FIG. 2 is a photograph of the film PPC-PLA-ST-1 prepared in example 1.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The experimental procedures, which do not address the specific conditions in the examples below, are generally carried out under conventional conditions or under conditions recommended by the manufacturer.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described herein are presented for illustrative purposes only.
The invention is further illustrated and described below with particular reference to examples.
Example 1
300g of PPC (M n 6000 g/mol) and 300g L-lactide are placed in a flask, 0.6g stannous octoate is added, the temperature is raised to 140 ℃, the mixture is magnetically stirred for reaction for 24 hours to obtain milky polyester PPC-PLA-1, and the milky polyester PPC-PLA-1 particles are obtained after being crushed by a crusher;
dissolving 400g of oxidized starch (oxidation degree of 50%) and 80g of aspartic acid in 1000ml of deionized water, uniformly stirring, heating to 60 ℃, stirring at a speed of 150rmp, reacting for 2 hours, freeze-drying, and grinding to obtain AA-ST-1 powder (110 meshes);
400g of AA-ST-1 powder and 600g of PPC-PLA-1 particles are added into a screw extruder, the mixture is banburying for 5 minutes at the temperature of 150 ℃ and the rotating speed of 60rpm, the product is extruded, air-cooled and granulated, and the mixture is blow molded into a film in a blow molding machine at the temperature of 160 ℃ to finally obtain a PPC-PLA-ST-1 film, the picture of the product is shown in figure 2, and a dumbbell-shaped sample bar M1 (the thickness is 1 mm) is manufactured by using a rubber pneumatic slicer.
Example 2
500g of PPC (M n 6000 g/mol) and 300g L-lactide are placed in a flask, 0.8g stannous octoate is added, the temperature is raised to 150 ℃, the mixture is magnetically stirred for reaction for 20 hours, so that milky polyester PPC-PLA-2 is obtained, and PPC-PLA-2 particles are obtained after being crushed by a crusher;
dissolving 400g of oxidized starch (oxidation degree of 50%) and 80g of aspartic acid in 1000ml of deionized water, uniformly stirring, heating to 60 ℃, stirring at a speed of 150rmp, reacting for 2 hours, freeze-drying, and grinding to obtain AA-ST-2 powder (105 meshes);
400g of AA-ST-2 powder and 600g of PPC-PLA-2 particles are added into a screw extruder, the mixture is banburying for 7min at the temperature of 150 ℃ and the rotating speed of 55rpm, the product is extruded, air-cooled and granulated, and the mixture is blow molded into a film in a blow molding machine at 160 ℃ to finally obtain a PPC-PLA-ST-2 film, and a dumbbell-shaped sample bar M2 (the thickness is 1 mm) is manufactured by using a rubber pneumatic slicer.
Example 3
300g of 3-PPC (M n 6000 g/mol) and 300g L-lactide are placed in a flask, 0.6g stannous octoate is added, the temperature is raised to 130 ℃, the mixture is magnetically stirred for reaction for 28 hours, so that milky polyester PPC-PLA-3 is obtained, and PPC-PLA-3 particles are obtained after being crushed by a crusher;
dissolving 400g of oxidized starch (oxidation degree of 50%) and 80g of aspartic acid in 1000ml of deionized water, uniformly stirring, heating to 60 ℃, stirring at a speed of 150rmp, reacting for 2 hours, freeze-drying, and grinding to obtain AA-ST-3 powder (120 meshes);
400g of AA-ST-3 powder and 600g of PPC-PLA-3 are added into a screw extruder, the mixture is banburying for 6min at the temperature of 160 ℃ and the rotating speed of 60rpm, the product is extruded, air-cooled and granulated, and the mixture is blow molded into a film in a blow molding machine at the temperature of 160 ℃ to finally obtain a PPC-PLA-ST-3 film, and a dumbbell-shaped sample bar M3 (the thickness is 1 mm) is manufactured by using a rubber pneumatic slicer.
Example 4
300g of PPC (M n 6000 g/mol) and 300g L-lactide are placed in a flask, 0.6g stannous octoate is added, the temperature is raised to 140 ℃, the mixture is magnetically stirred for reaction for 24 hours, so that milky polyester PPC-PLA-4 is obtained, and PPC-PLA-4 particles are obtained after being crushed by a crusher;
600g of oxidized starch (oxidation degree 50%) and 120g of aspartic acid are dissolved in 1500ml of deionized water, stirred evenly, heated to 70 ℃, stirred at a speed of 180rmp, reacted for 3 hours, freeze-dried and ground to obtain AA-ST-4 powder (125 meshes);
600gAA-ST-4 powder and 600g of PPC-PLA-4 are added into a screw extruder, the mixture is banburying for 5min at the temperature of 140 ℃ and the rotating speed of 50rpm, the product is extruded, air-cooled and granulated, and the mixture is blow molded into a film in a blow molding machine at 160 ℃ to finally obtain a PPC-PLA-ST-4 film, and a dumbbell-shaped sample bar M4 (the thickness is 1 mm) is manufactured by using a rubber pneumatic slicer.
Example 5
300g of PPC (M n =4000 g/mol) and 300g L-lactide are placed in a flask, 0.6g stannous octoate is added, the temperature is raised to 140 ℃, the reaction is carried out for 28 hours under magnetic stirring, thus obtaining milky polyester PPC-PLA-5, and the milky polyester PPC-PLA-5 is prepared byCrushing by a crusher to obtain PPC-PLA-5 particles;
dissolving 400g of oxidized starch (oxidation degree of 50%) and 80g of aspartic acid in 1000ml of deionized water, uniformly stirring, heating to 50 ℃, stirring at a stirring rate of 160rmp, reacting for 2.5h, freeze-drying, and grinding to obtain AA-ST-5 powder (105 meshes);
400g of AA-ST-5 powder and 600g of PPC-PLA-5 are added into a screw extruder, the mixture is banburying for 7min at the temperature of 150 ℃ and the rotating speed of 60rpm, the product is extruded, air-cooled and granulated, and the mixture is blow molded into a film in a blow molding machine at the temperature of 160 ℃ to finally obtain a PPC-PLA-ST-5 film, and a dumbbell-shaped sample bar M5 (the thickness is 1 mm) is manufactured by using a rubber pneumatic slicer.
Example 6
300g of PPC (M n 6000 g/mol) and 500g L-lactide are placed in a flask, 0.8g stannous octoate is added, the temperature is raised to 140 ℃, the mixture is magnetically stirred and reacts for 30 hours to obtain milky polyester PPC-PLA-6, and PPC-PLA-6 particles are obtained after the milky polyester PPC-PLA-6 is crushed by a crusher;
dissolving 400g of oxidized starch (oxidation degree of 50%) and 80g of aspartic acid in 1000ml of deionized water, uniformly stirring, heating to 60 ℃, stirring at a speed of 150rmp, reacting for 2 hours, freeze-drying, and grinding to obtain AA-ST-6 powder (115 meshes);
400g of AA-ST-6 and 600g of PPC-PLA-6 are added into a screw extruder, the mixture is banburying for 7min at the temperature of 160 ℃ and the rotating speed of 60rpm, the product is extruded, air-cooled and granulated, and the mixture is blow molded into a film in a blow molding machine at the temperature of 160 ℃ to finally obtain a PPC-PLA-ST-6 film, and a dumbbell-shaped sample bar M6 (the thickness is 1 mm) is manufactured by using a rubber pneumatic slicer.
Example 7
300g of PPC (M n 6000 g/mol) and 300g L-lactide are placed in a flask, 0.6g stannous octoate is added, the temperature is raised to 140 ℃, the mixture is magnetically stirred for reaction for 24 hours to obtain milky polyester PPC-PLA-7, and the milky polyester PPC-PLA-7 particles are obtained after being crushed by a crusher;
dissolving 400g of oxidized starch (oxidation degree 40%) and 120g of glutamic acid in 1000ml of deionized water, uniformly stirring, heating to 70 ℃, stirring at a speed of 200rmp, reacting for 3 hours, freeze-drying, and grinding to obtain AA-ST-7 powder (120 meshes);
400g of AA-ST-7 powder and 600g of PPC-PLA-7 particles are added into a screw extruder, the mixture is banburying for 5min at the temperature of 150 ℃ and the rotating speed of 60rpm, the product is extruded, air-cooled and granulated, and the mixture is blow molded into a film in a blow molding machine at the temperature of 160 ℃ to finally obtain a PPC-PLA-ST-1 film, and a dumbbell-shaped sample bar M7 (the thickness is 1 mm) is manufactured by using a rubber pneumatic slicer.
Test example:
mechanical properties: the breaking strength and the breaking elongation of the film are measured by using an HY939C type computer type single column tensile testing machine of Hengyu instrument limited company of Guangdong, and the stretching rate is 50mm/min; the water vapor transmission rate of the film was measured using water vapor transmission rate C390 (infrared method) from atanan opto-mechanical and electronic technology limited; the oxygen transmission rate of the film was measured using a G2/131X differential pressure gas transmission rate tester from Jinan blue opto-mechanical technology Co.
Degradation performance: the degradation properties of the materials were evaluated by testing their tensile strength at different stages. The film material was immersed in physiological saline at 37℃and measured at a period of 1 day, and when the tensile strength was zero, the degradation was considered to be completed.
Table 1 properties of the samples prepared in examples 1 to 6
Figure BDA0004129216500000061
The test results are shown in Table 1. From the properties of the film samples in Table 1, the film material has good breaking strength, elongation at break and barrier property (low water vapor and oxygen transmission), and good degradation property; an increase in PPC content (M2) will decrease its mechanical strength, but increase its barrier properties; with increasing PPC functionality (M3) or decreasing molecular weight (M5), the mechanical strength of the material can also be increased; an increase in PLA content (M6) will decrease the flexibility of the material, but increase the mechanical strength; the increase of the amino acid content (M7) also increases the crosslinking degree between the starch and the polyester, thereby improving the mechanical property; the starch content (M4) mainly affects the degradation time of the material. By adjusting the ratio, materials suitable for different directions can be obtained.

Claims (10)

1. The preparation method of the starch-based material with barrier property is characterized by comprising the following steps of:
1) Taking polypropylene carbonate polyol and lactide as raw materials, catalyzing the raw materials by a catalyst, carrying out copolymerization reaction for 12-48 hours at the temperature of 100-140 ℃ under normal pressure to obtain solid polyester PPC-PLA, and crushing the solid polyester PPC-PLA to obtain PPC-PLA particles;
2) Dissolving oxidized starch and amino acid in water, heating to 40-80 ℃ under stirring to react to obtain AA-ST, drying to remove water, and grinding to obtain AA-ST powder with the particle size of more than 100 meshes;
3) And carrying out banburying extrusion on the AA-ST powder and the PPC-PLA particles in a screw extruder to obtain the barrier starch-based material PPC-PLA-ST.
2. The method for preparing a starch-based material with barrier property according to claim 1, wherein in the step 1), the polypropylene carbonate polyol is one of polypropylene carbonate diol, polypropylene carbonate triol and polypropylene carbonate tetraol; the molecular weight is 500-10000 g/mol.
3. The method for preparing a starch-based material having barrier properties according to claim 1, wherein in the step 1), the molar ratio of the polypropylene carbonate polyol to the lactide is 1:10-100.
4. The method for preparing a starch-based material with barrier property according to claim 1, wherein in the step 1), the catalyst is a tin compound, and the addition amount is 0.01-0.3 wt% of the total mass of the raw materials in the step 1).
5. The method for producing a starch-based material having barrier properties according to claim 1, wherein in said step 2), the starch has an oxidation degree of 10 to 60%; the amino acid is glutamic acid and/or aspartic acid.
6. The method for preparing a starch-based material with barrier property according to claim 1, wherein in the step 2), the mass ratio of oxidized starch to amino acid is 100:10-50.
7. The method for preparing a starch-based material with barrier property according to claim 1, wherein in the step 3), the banburying conditions are as follows: the banburying temperature of the screw extruder is 140-200 ℃, the banburying rotating speed is 20-80rpm, and the banburying time is 3-10min.
8. The method for preparing a starch-based material with barrier property according to claim 1, wherein in the step 3), the mass ratio of AA-ST to PPC-PLA is 100:80-200.
9. The barrier starch-based material prepared by the method as claimed in any one of claims 1 to 8, wherein the mass percentage of starch in the barrier starch-based material PPC-PLA-ST is 30-50%.
10. The barrier starch-based material of claim 9, which is fully degradable for less than or equal to 24 days and has a break strength>27MPa, elongation at break>121%, water vapor transmission rate of less than 134g/m 2 Per 24 hours, the oxygen transmittance is less than 185cm 3 /m 2 /d/atm。
CN202310254946.XA 2023-03-16 2023-03-16 Preparation method of starch-based material with barrier property Pending CN116218152A (en)

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