CN115521595B - 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 47
- 238000002360 preparation method Methods 0.000 title description 6
- 239000000314 lubricant Substances 0.000 claims abstract description 18
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000012745 toughening agent Substances 0.000 claims description 20
- 239000000155 melt Substances 0.000 claims description 10
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims description 9
- 229920001038 ethylene copolymer Polymers 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229920002189 poly(glycerol 1-O-monomethacrylate) polymer Polymers 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 claims description 5
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 5
- 239000000194 fatty acid Substances 0.000 claims description 5
- 229930195729 fatty acid Natural products 0.000 claims description 5
- 150000004665 fatty acids Chemical class 0.000 claims description 5
- 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
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- -1 polybutylene succinate Polymers 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 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 239000012528 membrane Substances 0.000 abstract description 2
- 238000005266 casting 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 6
- 238000012360 testing method Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 239000003795 chemical substances by application 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
- 239000002994 raw material Substances 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 235000014347 soups Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 241001530119 Vaccaria Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000011156 evaluation 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
- 235000012054 meals Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 238000002834 transmittance Methods 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
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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
- 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 leakage-proof lunch box cover body, which comprises, by weight, 100 parts of PLA 70-80 parts, PBS 5-20 parts, flexibilizer 3-12 parts, reinforcing agent 0.5-2 parts, compatilizer 0.5-2 parts and lubricant balance. The film and the sealing frame made of the material have the characteristics of light weight, high temperature resistance, good toughness and transparency, and the sealing frame made of the material has the characteristics of high temperature resistance and high fastening force to the box body. Because the membrane method structure is adopted, the thickness of the cover body film is only 10-30 wires, the wall thickness of the frame body is 1-3mm, the cost is greatly reduced, and the sealing effect with low cost is realized.
Description
Technical Field
The invention relates to a material for a leakage-proof lunch box cover body and a preparation method thereof, belonging to the technical field of disposable lunch box materials.
Background
At present, in order to prevent and treat plastic garbage pollution, in the field of disposable cutlery boxes, the cutlery boxes made of non-degradable materials such as polystyrene are replaced by three degradable cutlery box varieties such as a coated paper cutlery box, a paper pulp molding cutlery box and a PLA cutlery box.
For the PE coated paper cutlery box, the problem that the cutlery box is opaque, low in strength, easy to soft and deform, incapable of being sealed, incapable of containing soup and the like can occur when the pure paper product is used, PE coated film compounding is needed, and the cutlery box cannot be completely degraded. The plastic upper cover is matched with the curled edge cup bowl to realize sealing, and is used for containing soup, beverage and the like. But the overall cost of the paper cup and the paper bowl matched with the PLA upper cover is increased by about 50 percent.
Pulp molded cutlery boxes are also required to achieve water and oil repellency by adding water and oil repellent agents. The oil-repellent agent has been internationally disabled because of its fluorine-containing nature, which is harmful to the environment. In addition, the pulp molding process has the problems of opacity, non-printing, no curling and difficulty in sealing by matching with a plastic upper cover.
The PLA meal box has high strength, water resistance, oil resistance, falling resistance, sealing property and transparency. The heat resistance of the treated PLA cutlery box reaches 100 degrees, and the cutlery box is suitable for containing any food. However, the productivity of the basic PLA material is small, and the cost is far higher than that of the traditional plastic cutlery box and paper pulp cutlery box.
Disclosure of Invention
In view of the shortcomings of the prior art, a first object of the present invention is to provide a leak-proof material for a cover of a lunch box.
A second object of the present invention is to provide a method for preparing the above material.
In order to achieve the first object, the present invention is realized by the following technical scheme: the leakproof material for the cover of the lunch box comprises, by weight, 70-80 parts of PLA, 5-20 parts of PBS, 3-12 parts of toughening agent, 0.5-2 parts of reinforcing agent, 0.5-2 parts of compatilizer and the balance of lubricant according to 100 parts.
Preferably, the PLA is of a left-handed 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 PLA-PCL copolymer or a vinyl acetate-ethylene copolymer complex, 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 base material, the vinyl acetate-ethylene copolymer is used as the auxiliary toughening agent, and under the cooperation of the two, the frame injection molding with better toughness, transparency and casting stability than that obtained by independent addition of the two 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 synthetic PGMA is adopted as the compatilizer, a better compatilizer effect is obtained with a lower addition amount, and under the cooperation of the compatilizer and the nano talcum powder, the effect of heat-resistant temperature of more than 80 ℃ under the low PBS content is obtained, and the migration of monomer under the addition of the high PBS content is avoided. And meanwhile, the material has synergistic effect with the toughening agent, so that the impact strength of the material is further improved.
Preferably, the lubricant is one or two of C14-C18 fatty acid monoglyceride and N, N-1, 2-ethanediylbisoctadecanyl (carbo) amide.
In order to achieve the second object, the present invention is realized by the following technical scheme: a preparation method of a material for a leakage-proof lunch box cover body 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 a compatilizer, a reinforcing agent and a lubricant, stirring, discharging, and carrying out vacuum extrusion granulation by an extruder to obtain the material for the cover of the anti-leakage film method lunch box.
By adopting the technical scheme, PLA, PBS and a toughening agent are added into a special sealed mixing pot, the temperature is raised to 60 ℃ and the mixture is stirred for 5min, a surface activated mixture is obtained, the mixture is stirred for 3min after the compatilizer, the reinforcing agent and the lubricant are added, then the mixture is discharged, and the material for the anti-leakage film method lunch box cover is obtained through vacuum extrusion granulation by an extruder.
Preferably, step S2 specifically includes: the melt extrusion temperature is 120-190 ℃, and the host machine rotating speed of the extruder is 400-600 rpm.
The invention has the beneficial effects that:
(1) The PLA-PCL copolymer is creatively selected as the toughening agent of the main base material, the vinyl acetate-ethylene copolymer is used as the auxiliary toughening agent, and under the cooperation of the two, the toughness, the transparency and the casting stability which are superior to those obtained by independent addition of the two are obtained, and the plastic is suitable for high-yield forming of films and small-size frame injection molding.
(2) The synthetic PGMA is creatively used as a compatilizer, a better compatilizer effect is obtained with a lower addition amount, and under the cooperation of the compatilizer and the nano talcum powder, the effect of heat-resistant temperature of more than 80 ℃ under the low PBS content is obtained, and the migration of monomer substances added with the high PBS content is avoided. And meanwhile, the material has synergistic effect with the toughening agent, so that the impact strength of the material is further improved.
(3) The invention has 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 made of the material have the characteristics of light weight, high temperature resistance, good toughness and transparency, and the sealing frame made of the material has the characteristics of high temperature resistance and high fastening force to the box body. Because the membrane method structure is adopted, the thickness of the cover body film is only 10-30 wires, the wall thickness of the frame body is 1-3mm, the cost is greatly reduced, and the sealing effect with low cost is realized.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Example 1
A material for a leakage-proof lunch box cover body 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 is of a L-spin structure, the melting point is 168 ℃, and the melt index is 3g/10min.
In this embodiment, the PBS is polybutylene succinate.
In the embodiment, the toughening agent is a PLA-PCL copolymer or a vinyl acetate-ethylene copolymer complex, and the mass ratio of the PLA-PCL copolymer to the vinyl acetate-ethylene copolymer is 2:1.
In this embodiment, the reinforcing agent is nano talcum powder.
In this example, the compatibilizer is PGMA (methacrylate-glycidyl methacrylate copolymer).
In this example, the lubricant is a C14-C18 fatty acid monoglyceride or diglyceride.
A preparation method of a material for a leakage-proof lunch box cover body comprises the following steps:
s1: adding PLA, PBS and a toughening agent into a special sealed mixing pot, heating to 60 ℃ and stirring for 5min to obtain a surface-activated mixture;
s2: and (3) adding the compatilizer, the reinforcing agent and the lubricant, stirring for 3min, discharging, and carrying out vacuum extrusion granulation by an extruder to obtain the material for the cover of the anti-leakage film method lunch box.
In this example, the melt extrusion temperature was 120℃and the host machine speed of the extruder was 400 rpm.
Example 2
The material for the cover of the leakproof lunch box is different from the material in the embodiment 1 in 80g of PLA, 5g of PBS, 12g of toughening agent, 0.5g of reinforcing agent and 2g of compatilizer.
PLA has a L-shaped structure, the melting point is 178 ℃, and the melt index is 8g/10min.
The lubricant is N, N-1, 2-ethanediylbisoctadecanyl (carbo) amide.
The process for preparing the material for the lid of the leakproof lunch box differs from example 1 in that the melt extrusion temperature is 190℃and the main machine rotation speed of the extruder is 500 revolutions per minute.
Example 3
The material for the cover of the leakproof lunch box is different from the material in the embodiment 1 in 75g of PLA, 17g of PBS, 3g of toughening agent, 2g of reinforcing agent, 2g of compatilizer and 1g of lubricant.
PLA has a L-shaped structure, the melting point is 170 ℃, and the melt index is 12g/10min.
The lubricant is a mixture of C14-C18 fatty acid monoglyceride and N, N-1, 2-ethylene dioctadecyl (carbon) amide, and the mass ratio of the two is 1:1.
The process for preparing the material for the lid of the leakproof lunch box differs from example 1 in that the melt extrusion temperature is 150℃and the main machine rotation speed of the extruder is 600 revolutions per minute.
Example 4
The material for the cover of the leakproof lunch box is different from the material in the embodiment 1 in 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 is the same as that of example 1.
Example 5
A material for a leakage-proof lunch box cover body 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 is the same as that of example 1.
Test example 1
PLA resin adopts the L175 of Totalcorbin;
PBS resin adopts A200 of golden technology;
the vinyl acetate-ethylene copolymer in the toughening agent is prepared from Vaccaria;
the enhancer is Shen Ba nano Talc;
the C14-C18 fatty acid monoglyceride and diglyceride in the lubricant are selected from products of Share Asia Tai auxiliary agent Co., ltd, and the N, N-1, 2-ethylene dioctadecyl (carbon) amide is selected from Cheng Tong Yue chemical technology products;
the raw material components of the experimental group and the comparative group 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 4 hours, in a specific embodiment, performing impact performance test by using a notch impact tester, performing elongation at break test by using a universal tester, performing transparency test and melt stability evaluation by using a film with 5-wire thickness produced by a casting film machine, wherein the test environment is at room temperature of 23 ℃, and the experimental results are shown in table 2;
table 2 statistical table of results of various test performance data
Table 2 shows the results of the test of the materials for the cover of the anti-leakage film method prepared in each of the experimental groups 1 to 3, and the comparison of the transparency of the film and the stability of the drift edge (melt strength) of the casting process was made. Comparison group 2, comparison group 3 and experiment group 2 are compared, 2525 or PLA-PCL copolymer is singly adopted, the light transmittance of the film is reduced compared with the film, the casting stability is reduced, and the elongation at break and notch impact toughness are reduced. Experiment group 2 was compared with comparative group 3 without PGMA, casting stability, impact strength, heat distortion temperature were reduced. Experiment group 2 and comparison group 5 were compared, without using nano talc powder, the heat distortion temperature was reduced. Under the coordination of nano talcum powder and PGMA, the thermal deformation temperature is more than 80 ℃. Experiment group 2 was compared with comparative group 5, and no lubricant was used, adversely affecting the casting stability, and the fracture toughness was slightly lowered.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, 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 may be embodied in 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. The material for the anti-leakage lunch box cover is characterized by comprising, by weight, 100 parts of PLA 70-80 parts, PBS 5-20 parts, flexibilizer 3-12 parts, reinforcing agent 0.5-2 parts, compatilizer 0.5-2 parts and lubricant balance;
the toughening agent is a PLA-PCL copolymer and a vinyl acetate-ethylene copolymer complex, and the mass ratio of the PLA-PCL copolymer to the vinyl acetate-ethylene copolymer is 2:1.
2. The leak-proof cover material of claim 1, wherein the PLA has a left-handed structure, a melting point of 168-178 ℃ and a melt index of 3-12g/10min.
3. The leak resistant cover material as recited in claim 2, wherein the PBS is polybutylene succinate.
4. A leak-proof cover material as defined in claim 3, wherein the reinforcing agent is nano talc.
5. The leak-proof cover material of claim 4, wherein the compatibilizer is PGMA.
6. The leak resistant cover material as set forth in claim 5, wherein said lubricant is one or both of a C14-C18 fatty acid monoglyceride and an N, N-1, 2-ethanediylbisoctadecanyl (carbo) amide.
7. A method of making a leak-proof cover material as defined in any one of claims 1-6, comprising the steps of:
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 a compatilizer, a reinforcing agent and a lubricant, stirring, discharging, and carrying out vacuum extrusion granulation by an extruder to obtain the material for the cover of the anti-leakage film method lunch box.
8. The method for preparing a material for a leakage prevention lunch box cover according to claim 7, wherein step S2 is specifically: the melt extrusion temperature is 120-190 ℃, and the host machine rotating speed of the extruder is 400-600 rpm.
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