CN115521595A - Material for leakage-proof lunch box cover and preparation method thereof - Google Patents
Material for leakage-proof lunch box cover and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title description 9
- 239000012745 toughening agent Substances 0.000 claims abstract description 24
- 239000000314 lubricant Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 14
- 239000012528 membrane Substances 0.000 claims abstract description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 23
- 229920001038 ethylene copolymer Polymers 0.000 claims description 11
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 9
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 7
- 239000000194 fatty acid Substances 0.000 claims description 7
- 229930195729 fatty acid Natural products 0.000 claims description 7
- 229920002189 poly(glycerol 1-O-monomethacrylate) polymer Polymers 0.000 claims description 7
- 150000004665 fatty acids Chemical class 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- -1 polybutylene succinate Polymers 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000004631 polybutylene succinate Substances 0.000 claims description 3
- 229920002961 polybutylene succinate Polymers 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 3
- 229910052623 talc Inorganic materials 0.000 claims description 3
- 238000004382 potting Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000007789 sealing Methods 0.000 abstract description 6
- 238000005266 casting Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000005871 repellent Substances 0.000 description 3
- 125000005521 carbonamide group Chemical group 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 235000012222 talc Nutrition 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- C08L67/04—Polyesters derived from hydroxycarboxylic 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
- C08L2203/162—Applications used for films sealable films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
-
- 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)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a material for a leakproof lunch box cover, which comprises 70-80 parts by weight of PLA, 5-20 parts by weight of PBS, 3-12 parts by weight of toughening agent, 0.5-2 parts by weight of reinforcing agent, 0.5-2 parts by weight of compatilizer and the balance of lubricant by 100 parts by weight. The film and the sealing frame are made of the material, the made film has the characteristics of lightness, thinness, high temperature resistance, toughness and good transparency, and the made sealing frame has the characteristics of high temperature resistance and high fastening force on a box body. Due to the adoption of the membrane method structure, the thickness of the cover body film is only 10-30 threads, and the wall thickness of the frame body is 1-3mm, so that the cost is greatly reduced, and the low-cost sealable effect is realized.
Description
Technical Field
The invention relates to a material for a leakage-proof lunch box cover and a preparation method thereof, belonging to the technical field of disposable lunch box materials.
Background
At present, in order to prevent plastic garbage pollution, in the field of disposable lunch boxes, degradable lunch boxes such as laminated paper lunch boxes, pulp molding lunch boxes and PLA lunch boxes are mainly used to replace polystyrene and other non-degradable lunch boxes.
To drenching membrane paper cutlery box, use pure paper products and can appear opaque, the intensity is low, easily becomes soft yielding, can't be sealed, unable splendid attire hot water scheduling problem, need carry out PE and drench membrane complex, this part will lead to the unable complete degradation of cutlery box. The plastic upper cover can realize sealing by matching with the curled cup bowl, and is used for containing soup, beverages and the like. But the overall cost of the paper cup and paper bowl combined with the PLA upper cover is increased by about 50 percent.
The pulp-molded lunch box also needs to be water-and oil-repellent by adding a water-and oil-repellent agent. Since the oil-repellent agent contains fluorine and is harmful to the environment, it has been internationally banned. In addition, the pulp molding process has the problems of opacity, no printing, no curling and difficulty in realizing sealing by matching with a plastic upper cover.
PLA cutlery box has intensity height, waterproof grease proofing prevents falling, can seal, can be transparent. The heat resistance of the treated PLA lunch box can reach 100 ℃, and the PLA lunch box is suitable for containing any food. However, the basic PLA material has low productivity and cost far higher than that of the traditional plastic lunch box and the pulp lunch box.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a leakage-proof lunch box cover material.
The second purpose of the invention is to provide a preparation method of the material.
In order to achieve the first object, the invention is realized by the following technical scheme: the material for the leakproof dining box cover comprises, by weight, 100 parts of 70-80 parts of PLA, 5-20 parts of PBS, 3-12 parts of a toughening agent, 0.5-2 parts of a reinforcing agent, 0.5-2 parts of a compatilizer and the balance of a lubricant.
Preferably, the PLA has a levorotatory structure, the melting point is 168-178 ℃, and the melt index is 3-12g/10min.
Preferably, the PBS is polybutylene succinate.
Preferably, the toughening agent is a complex of a PLA-PCL copolymer and a vinyl acetate-ethylene copolymer, and the mass ratio of the PLA-PCL copolymer to the vinyl acetate-ethylene copolymer is 2:1.
By adopting the technical scheme, the PLA-PCL copolymer is selected as the toughening agent of the main body base material, the vinyl acetate-ethylene copolymer is used as the auxiliary toughening agent, and under the cooperation of the PLA-PCL copolymer and the auxiliary toughening agent, the frame injection molding with better toughness, transparency and casting stability than those obtained by independently adding the PLA-PCL copolymer and the ethylene copolymer is obtained.
Preferably, the reinforcing agent is nano talcum powder.
Preferably, the compatibilizer is PGMA (methacrylate-glycidyl methacrylate copolymer).
By adopting the technical scheme, the synthesized PGMA is used as the compatilizer, a better compatilized effect is obtained by using a lower addition amount, the effect that the heat-resistant temperature is higher than 80 ℃ under the condition of low PBS content is obtained by matching with the nano talcum powder, and the migration of monomers under the condition of high PBS content is avoided. Simultaneously, the impact strength of the material is further improved by the synergistic effect of the toughening agent and the material.
Preferably, the lubricant is one or two of C14-C18 fatty acid glycerol mono-diester and N, N-1,2-ethanediylbisacyl (carbonamide).
In order to achieve the second object, the invention is realized by the following technical scheme: a preparation method of a material for a leak-proof lunch box cover comprises the following steps:
s1: adding PLA, PBS and a toughening agent into a closed mixing pot, heating and stirring to obtain a surface activated mixture;
s2: and adding the compatilizer, the reinforcing agent and the lubricant, stirring, discharging, and performing vacuum extrusion granulation by an extruder to obtain the material for the lunch box cover with the leak-proof membrane method.
By adopting the technical scheme, PLA, PBS and a toughening agent are added into a specially-made closed mixing pot, the temperature is raised to 60 ℃, the mixture is stirred for 5min to obtain a surface-activated mixture, the compatilizer, the reinforcing agent and the lubricant are added, the mixture is stirred for 3min and then discharged, and the material for the lunch box cover by the leak-proof membrane method is obtained by performing vacuum extrusion granulation by an extruder.
Preferably, step S2 specifically includes: the melt extrusion temperature is 120-190 ℃, and the main machine rotating speed of the extruder is 400-600 r/min.
The invention has the beneficial effects that:
(1) According to the invention, the PLA-PCL copolymer is creatively selected as the toughening agent of the main body base material, the vinyl acetate-ethylene copolymer is used as the auxiliary toughening agent, and the toughness, the transparency and the casting stability which are better than those obtained by independently adding the PLA-PCL copolymer and the vinyl acetate-ethylene copolymer are obtained under the cooperation of the PLA-PCL copolymer and the auxiliary toughening agent, so that the PLA-PCL composite film is suitable for high-yield film forming and small-size frame injection molding.
(2) The invention creatively uses the synthesized PGMA as the compatilizer, obtains better compatibility effect with lower addition amount, obtains the effect that the heat-resisting temperature is more than 80 ℃ under the condition of low PBS content by matching with the nano talcum powder, and avoids the migration of monomer under the condition of high PBS content. Simultaneously, the impact strength of the material is further improved by the synergistic effect of the toughening agent and the material.
(3) The method has the advantages of simple process and obvious product effect, reduces the dependence on production equipment to a certain extent, meets the market demand, and has wide commercial application prospect and market value.
(4) The film and the sealing frame are made of the material, the made film has the characteristics of lightness, thinness, high temperature resistance, toughness and good transparency, and the made sealing frame has the characteristics of high temperature resistance and high fastening force to the box body. Due to the adoption of the membrane method structure, the thickness of the cover body film is only 10-30 threads, and the wall thickness of the frame body is 1-3mm, so that the cost is greatly reduced, and the low-cost sealable effect is realized.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
A material for a leakproof lunch box cover comprises 70g of PLA, 20g of PBS, 8g of toughening agent, 1g of reinforcing agent, 0.5g of compatilizer and 0.5g of lubricant.
In this example, PLA has a levorotatory structure, a melting point of 168 ℃ and a melt index of 3g/10min.
In this example, PBS is polybutylene succinate.
In the embodiment, the toughening agent is a complex of PLA-PCL copolymer and vinyl acetate-ethylene copolymer, and the mass ratio of the PLA-PCL copolymer to the vinyl acetate-ethylene copolymer is 2:1.
In this example, the reinforcing agent was nano talc.
In this example, the compatibilizer was PGMA (methacrylate-glycidyl methacrylate copolymer).
In this example, the lubricant is a C14-C18 fatty acid glycerol mono-di-ester.
A preparation method of a material for a leakproof lunch box cover comprises the following steps:
s1: adding PLA, PBS and a toughening agent into a special closed mixing pot, heating to 60 ℃, and stirring for 5min to obtain a surface activated mixture;
s2: and adding the compatilizer, the reinforcing agent and the lubricant, stirring for 3min, discharging, and performing vacuum extrusion granulation by using an extruder to obtain the material for the lunch box cover by the leak-proof membrane method.
In this example, the melt extrusion temperature was 120 ℃ and the main machine rotation speed of the extruder was 400 rpm.
Example 2
The material for the leakproof lunch box cover is different from the material in example 1 in that 80g of PLA, 5g of PBS, 12g of toughening agent, 0.5g of reinforcing agent and 2g of compatilizer.
PLA is a levorotatory structure, the melting point is 178 ℃, and the melt index is 8g/10min.
The lubricant is N, N-1,2-ethanediylbisitacid (carbonamide).
The preparation method of the material for the leakproof lunch box cover is different from the embodiment 1 in that the melt extrusion temperature is 190 ℃, and the main machine rotating speed of an extruder is 500 r/min.
Example 3
The difference between the material for the leakproof lunch box cover and the material in the embodiment 1 is that 75g of PLA, 17g of PBS, 3g of toughening agent, 2g of reinforcing agent, 2g of compatilizer and 1g of lubricant.
PLA is of a levorotatory structure, the melting point is 170 ℃, and the melt index is 12g/10min.
The lubricant is a mixture of C14-C18 fatty acid glycerol monoester and N, N-1,2-ethanediylbis octadecanamide, and the mass ratio of the glycerol monoester to the fatty acid glycerol diester is 1:1.
The preparation method of the material for the leakproof lunch box cover is different from the embodiment 1 in that the melt extrusion temperature is 150 ℃, and the main machine rotating speed of an extruder is 600 revolutions per minute.
Example 4
The difference between the material for the leakproof lunch box cover and the material in the embodiment 1 is 75g of PLA, 15g of PBS, 7g of toughening agent, 1g of compatilizer and 1g of lubricant.
A method for preparing a material for a leakproof lunch box cover, which is the same as in example 1.
Example 5
A material for a leakproof lunch box cover comprises 75g of PLA, 10g of PBS, 10g of toughening agent, 2g of reinforcing agent, 2g of compatilizer and 1g of lubricant.
A method for preparing a material for a leakproof lunch box cover, which is the same as in example 1.
Test example 1
The PLA resin was L175 from Totalcorbin;
PBS resin adopts A200 of golden hair technology;
the vinyl acetate-ethylene copolymer in the toughening agent selects Wake 2525;
the intensifier is Shen Ba nano Talc;
in the lubricant, C14-C18 fatty acid glycerol monoester and C18 fatty acid glycerol monoester are selected from products of Asia-Tai auxiliary agent Limited in Haian county, and N, N-1,2-ethanediylbis octadecanamide is selected from Cheng Tong Yuehe chemical engineering science and technology products;
the experimental and comparative raw material compositions are shown in table 1, and the preparation method of each group is the same as that of example 1.
TABLE 1 raw material composition Table of examples and comparative examples
Drying the prepared composite material in a dehumidifying drying oven at 85 ℃ for 4h, wherein in the specific embodiment, a notch impact tester is used for testing impact performance, a universal tester is used for testing elongation at break, a casting film machine is used for producing a film with the thickness of 5 filaments for transparency test and melt stability evaluation, the test environment is room temperature 23 ℃, and the test results are shown in table 2;
table 2 statistics table for each performance data
Table 2 shows the test results of the materials for the lid body of the leak-proof film method lunch box prepared by each experimental group and the comparative group, wherein the experimental groups 1 to 3 prepared products with different content levels and compared the transparency of the film with the edge floating stability (melt strength) of the casting process. The comparison group 2 and the comparison group 3 are compared with the experiment group 2, and the 2525 or the PLA-PCL copolymer is independently adopted, so that the light transmittance of the film is reduced compared with the light transmittance of the film and the PCL copolymer in a matching way, the casting stability is reduced, and the elongation at break and the notch impact toughness are reduced. In comparison with the control group 3, the experimental group 2 showed a decrease in casting stability, impact strength and heat distortion temperature without using PGMA. In comparison with the control group 5, the thermal deformation temperature of the experimental group 2 is reduced without using nano talc powder. Under the coordination of the nano talcum powder and the PGMA, the thermal deformation temperature is more than 80 ℃. In comparison with the comparative group 5, the experimental group 2 did not use a lubricant, adversely affecting the casting stability and slightly decreasing the fracture toughness.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics 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 (9)
1. The material for the leakproof lunch box cover is characterized by comprising 70-80 parts by weight of PLA, 5-20 parts by weight of PBS, 3-12 parts by weight of toughening agent, 0.5-2 parts by weight of reinforcing agent, 0.5-2 parts by weight of compatilizer and the balance of lubricant according to 100 parts by weight.
2. The material for the leak-proof lunch box cover as claimed in claim 1, wherein said PLA has a levorotatory structure, a melting point of 168-178 ℃ and a melt index of 3-12g/10min.
3. The material for the cover of the leakproof dining box as claimed in claim 2, wherein the PBS is polybutylene succinate.
4. The material for the leakproof lunch box cover as claimed in claim 3, wherein the toughening agent is a composition of PLA-PCL copolymer and vinyl acetate-ethylene copolymer, and the mass ratio of the PLA-PCL copolymer to the vinyl acetate-ethylene copolymer is 2:1.
5. The material for the leak-proof lunch box cover as claimed in claim 4, wherein said reinforcing agent is nano talc.
6. The material for a leak-proof lunch box cover as recited in claim 5, wherein said compatibilizer is PGMA.
7. The material for the leakproof lunch box cover as claimed in claim 6, wherein the lubricant is one or two of C14-C18 fatty acid glycerol mono-di-ester and N, N-1,2-ethanediylbisacta (carbo) -amide.
8. A method for preparing the material for the leakproof lunch box cover as claimed in any one of claims 1 to 7, comprising the following steps:
s1: adding PLA, PBS and a toughening agent into a closed mixing pot, and heating and stirring to obtain a surface-activated mixture;
s2: and adding the compatilizer, the reinforcing agent and the lubricant, stirring, discharging, and performing vacuum extrusion granulation by an extruder to obtain the material for the lunch box cover with the leak-proof membrane method.
9. The method for preparing a material for a leak-proof lunch box cover as claimed in claim 8, wherein the step S2 is specifically as follows: the melt extrusion temperature is 120-190 ℃, and the main machine rotating speed of the extruder is 400-600 r/min.
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