Seawater-degradable environment-friendly plastic meal box and preparation method thereof

Abstract

The invention discloses an environment-friendly plastic lunch box capable of being degraded by seawater, and belongs to the technical field of lunch boxes integrally formed by a plastic uptake process, the environment-friendly plastic lunch box comprises a lunch box, a plurality of food grooves and buckle grooves are formed in the lunch box, a plurality of anti-scald grooves are formed in the bottom of the lunch box, and handle grooves are formed in the two sides of the lunch box; and a buckle edge is arranged in the box cover, the buckle edge is clamped in the buckle groove, and the box cover is detachably connected to the handle groove. Through the synergistic effect of the PHA, the PBAT / PBS, the inorganic filler, the antioxidant, the soybean oil and the heat stabilizer, the seawater degradation environment-friendly plastic meal box can be gradually degraded in a seawater environment, finally converted into small fragments and further decomposed into water and carbon dioxide by microorganisms, the cost is low, accumulation of plastic in the ocean can be reduced, and the service life of the meal box is prolonged. And the ocean is protected.

Description

Technical Field

[0001] The invention belongs to the technical field of lunch boxes integrally formed by a blister forming process, and in particular relates to an environmentally friendly plastic lunch box degradable by seawater and a preparation method thereof. Background Art

[0002] In recent years, with the booming global economic activities, the widespread use of plastic films as indispensable polymer materials has greatly improved the convenience of life. However, these traditional plastic films based on petroleum resources, such as polyethylene and polypropylene, while bringing convenience, have also caused serious environmental pollution and resource depletion problems. In view of this, the scientific research community and the industry have turned to exploring alternatives to fully biodegradable plastic films in order to reduce dependence on petroleum and ease environmental pressure.

[0003] Although biodegradable polyester materials such as polylactic acid and polybutylene succinate have shown good application prospects and can be completely decomposed by microorganisms in nature, their high cost, limited processing applicability and specific equipment requirements still limit their widespread promotion in the market. In particular, due to the particularity of the marine environment, the degradation efficiency of existing biodegradable plastics has dropped significantly, and they cannot effectively deal with the ecological crisis caused by the accumulation of plastic particles in seawater.

[0004] At the same time, after the existing lunch boxes are made and filled with food, the food has a certain temperature, and it is easy to burn by hand. Moreover, after the meal is made, it is easy to spill during the takeaway transportation. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that existing biodegradable polyester materials such as polylactic acid and polybutylene succinate have shown good application prospects. They can be completely decomposed by microorganisms in nature, but their high cost, limited processing applicability and specific equipment requirements still limit their wide promotion in the market. In particular, in view of the particularity of the marine environment, the degradation efficiency of existing biodegradable plastics has been significantly reduced, and it is impossible to effectively deal with the ecological crisis caused by the accumulation of plastic particles in seawater. Therefore, a seawater-degradable environmentally friendly plastic lunch box and a preparation method thereof are proposed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an environmentally friendly plastic lunch box degradable by seawater and a preparation method thereof, comprising:

[0007] A lunch box, wherein a plurality of food slots and buckle slots are arranged inside the lunch box, a plurality of anti-scalding grooves are arranged at the bottom of the lunch box, and handle slots are arranged on both sides of the lunch box;

[0008] The box cover is provided with a buckle edge therein, the buckle edge is buckled in the buckle groove, and the box cover is detachably connected to the handle groove.

[0009] As a further description of the above technical solution:

[0010] Baffles are arranged between the plurality of food grooves, and a plurality of isolation holes are arranged at the bottom of the lunch box, and the isolation holes penetrate to the top of the baffles.

[0011] As a further description of the above technical solution:

[0012] Inwardly extending grooves are arranged on both sides of the box cover, and the grooves form connecting blocks on the inner wall of the box cover, and the connecting blocks are correspondingly clamped in the handle grooves.

[0013] As a further description of the above technical solution:

[0014] The groove is rectangular.

[0015] As a further description of the above technical solution:

[0016] An environmentally friendly plastic lunch box degradable by seawater, comprising the following raw materials in percentage by mass:

[0017]

[0018]

[0019] As a further description of the above technical solution:

[0020] The present invention also provides a method for preparing an environmentally friendly plastic lunch box degradable by seawater, which specifically comprises the following steps:

[0021] S1: Raw material preparation and pretreatment: PHA, PBAT / PBS, inorganic filler, antioxidant, soybean oil and thermal stabilizer are weighed respectively according to the above mass percentage requirements;

[0022] S2: Ingredients and mixing: weigh the raw materials accurately according to the given proportions of PHA: 90%, PBAT / PBS: 5%, inorganic filler: 4-5%, antioxidant: 0.1%, soybean oil: 0.2%, thermal stabilizer: 0.1%; put all the raw materials into a high-speed mixer and mix them thoroughly to ensure that the components are evenly distributed;

[0023] S3: melt blending, feeding the mixed raw materials into a twin-screw extruder or internal mixer for melt blending;

[0024] S4: Vacuum forming, the raw materials are blended and plasticized by the screw to extrude into sheets, and then heated again and formed by vacuum forming process:

[0025] S5: Cooling and demoulding. The formed lunch box is cooled in the mold to ensure that its shape and size are stable. After cooling to room temperature, the lunch box is removed from the mold for subsequent processing;

[0026] S6: As needed, the product is trimmed, cleaned and dried to obtain the final seawater-degradable environmentally friendly plastic lunch box.

[0027] As a further description of the above technical solution:

[0028] In the above-mentioned S6, the product is subjected to oil and water repellent treatment.

[0029] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0030] 1. In the present invention, biodegradable materials such as PHA (polyhydroxyalkanoate) and PBAT / PBS (polyethylene terephthalate / polybutylene succinate) can be decomposed by microorganisms in the natural environment. Microorganisms gradually break these polymer chains through enzymes and eventually convert them into small molecules. At the same time, inorganic fillers (such as calcium carbonate, talcum powder, etc.) work synergistically. The inorganic fillers provide a surface for microorganisms to attach, increase the contact area between microorganisms and materials, and thus accelerate the degradation rate. Soybean oil, as a bio-based plasticizer, not only improves the flexibility and processing properties of the material, but also promotes the degradation of the material in seawater. The fatty acid components in soybean oil can be used by microorganisms, further accelerating the degradation of the material. During the vacuum forming process, the material is injected into the mold. During this process, the material will form certain microstructures (pores, cracks, etc.), which provide more invasion points for microorganisms, which is conducive to the growth and reproduction of microorganisms inside the material. In the seawater environment, the salt, microorganisms, temperature and other factors in the seawater act together on the surface and interior of the material. The salt can destroy the surface structure of the material, making it more susceptible to erosion by microorganisms; the microorganisms gradually decompose the material through the action of enzymes; and the suitable temperature provides favorable conditions for the growth and reproduction of microorganisms. Through the synergistic effect of these ingredients, the seawater-degradable environmentally friendly plastic lunch box can gradually degrade in the seawater environment, and eventually be converted into smaller fragments, which are further decomposed into water and carbon dioxide by microorganisms. It is not only low-cost, but also can reduce the accumulation of plastic in the ocean and protect the ocean.

[0031] 2. In the present invention, an anti-scalding groove is provided at the bottom of the lunch box, an anti-scalding pad is provided in the anti-scalding groove, and handle grooves are provided on both sides of the lunch box, so that the anti-scalding groove can be supported by hand when taking the food, or the handle groove can be taken. During the take-out transportation process, the connecting block can be clamped in the handle groove when packing to avoid food spilling when the box cover falls off during transportation. In addition, a plurality of isolation holes are provided at the bottom of the lunch box, and the isolation holes extend to the top of the baffle to reduce the temperature transfer of each food and maintain the taste of the food. The isolation holes can also increase the contact area with seawater when the seawater is degraded, thereby improving the degradation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 Decomposition of an environmentally friendly plastic lunch box that can be degraded in seawater Figure 1 .

[0034] Figure 2 Decomposition of an environmentally friendly plastic lunch box that can be degraded in seawater Figure 2 .

[0035] Figure 3 Decomposition of an environmentally friendly plastic lunch box that can be degraded in seawater Figure 3 .

[0036] Figure 4 The present invention is a flowchart of the steps of a method for preparing an environmentally friendly plastic lunch box that can be degraded by seawater.

[0037] Legend:

[0038] 1-lunch box; 2-food slot; 3-clip slot; 4-anti-scalding groove; 5-handle slot; 6-box cover; 8-connecting block; 9-baffle; 10-isolation hole; 11-groove. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "inner", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Embodiment 1

[0046] See also Figure 1-3 The present invention provides a technical solution: an environmentally friendly plastic lunch box that can be degraded by seawater, comprising:

[0047] A lunch box 1 is provided with a plurality of food slots 2 and buckle slots 3, a plurality of anti-scalding grooves 4 are provided at the bottom of the lunch box 1, and handle slots 5 are provided on both sides of the lunch box 1;

[0048] The box cover 6 is provided with a buckle edge therein, and the buckle edge is buckled in the buckle groove 3 . The box cover 6 is detachably connected to the handle groove 5 .

[0049] A baffle plate 9 is disposed between the plurality of food grooves 2 , and a plurality of isolation holes 10 are disposed at the bottom of the lunch box 1 , and the isolation holes 10 penetrate to the top of the baffle plate 9 .

[0050] Inwardly extending grooves 11 are provided on both sides of the box cover 6 , and the grooves 11 form connecting blocks 8 on the inner wall of the box cover, and the connecting blocks 8 are correspondingly snapped into the handle grooves 5 .

[0051] The groove 11 is rectangular.

[0052] Embodiment 2

[0053] See also Figure 4 , an environmentally friendly plastic lunch box degradable by seawater, comprising the following raw materials in percentage by mass:

[0054]

[0055] The present invention also provides a method for preparing an environmentally friendly plastic lunch box degradable by seawater, which specifically comprises the following steps:

[0056] S1: Raw material preparation and pretreatment: PHA, PBAT / PBS, inorganic filler, antioxidant, soybean oil and thermal stabilizer are weighed respectively according to the above mass percentage requirements;

[0057] S2: Ingredients and mixing: weigh the raw materials accurately according to the given proportions of PHA: 90%, PBAT / PBS: 5%, inorganic filler: 4-5%, antioxidant: 0.1%, soybean oil: 0.2%, thermal stabilizer: 0.1%; put all the raw materials into a high-speed mixer and mix them thoroughly to ensure that the components are evenly distributed;

[0058] S3: melt blending, feeding the mixed raw materials into a twin-screw extruder or internal mixer for melt blending;

[0059] S4: Vacuum forming, the raw materials are blended and plasticized by the screw to extrude into sheets, and then heated again and formed by vacuum forming process:

[0060] S5: Cooling and demoulding. The formed lunch box is cooled in the mold to ensure that its shape and size are stable. After cooling to room temperature, the lunch box is removed from the mold for subsequent processing;

[0061] S6: As needed, the product is trimmed, cleaned and dried to obtain the final seawater-degradable environmentally friendly plastic lunch box.

[0062] Embodiment 3

[0063] In S6, the product is subjected to oil and water proofing treatment to improve the usability of the lunch box.

[0064] Working principle: By selecting biodegradable materials such as PHA, PBAT / PBS, and adding additives such as inorganic fillers, antioxidants, soybean oil and heat stabilizers, materials with microstructures such as pores and cracks are formed. In the seawater environment, these materials are affected by the combined effects of salt, microorganisms and temperature, making it easier for microorganisms to attach and invade the interior of the material, and gradually decompose the polymer chains through the action of enzymes, and finally convert them into harmless substances such as carbon dioxide and water, thereby achieving seawater degradation of the lunch box, which is not only low-cost, but also can reduce the amount of plastic in the ocean. At the same time, an anti-scalding groove is set at the bottom of the lunch box, and handle grooves are set on both sides of the lunch box, so that when taking out, you can hold the anti-scalding groove with your hand, or you can take the handle groove. In the process of take-out transportation, the connecting block can be connected to the inside of the handle groove when packing, so as to avoid food spilling when the box cover falls off during transportation. In addition, a number of isolation holes are set at the bottom of the lunch box, and the isolation holes extend to the top of the baffle to reduce the temperature transfer of each food and maintain the taste of the food. In addition, the isolation holes can also increase the contact area with seawater when seawater degrades.

[0065] Improve degradation efficiency.

[0066] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An environmentally friendly plastic lunch box that can be degraded by seawater, characterized in that: include: A lunch box, wherein a plurality of food slots and buckle slots are arranged inside the lunch box, a plurality of anti-scalding grooves are arranged at the bottom of the lunch box, and handle slots are arranged on both sides of the lunch box; The box cover is provided with a buckle edge therein, the buckle edge is buckled in the buckle groove, and the box cover is detachably connected to the handle groove.

2. The environmentally friendly plastic lunch box degradable by seawater according to claim 1, characterized in that: Baffles are arranged between the plurality of food grooves, and a plurality of isolation holes are arranged at the bottom of the lunch box, and the isolation holes penetrate to the top of the baffles.

3. The environmentally friendly plastic lunch box degradable by seawater according to claim 2, characterized in that: Inwardly extending grooves are arranged on both sides of the box cover, and the grooves form connecting blocks on the inner wall of the box cover, and the connecting blocks are correspondingly clamped in the handle grooves.

4. The environmentally friendly plastic lunch box degradable by seawater according to claim 3, characterized in that: The groove is rectangular.

5. The environmentally friendly plastic lunch box degradable by seawater according to claim 1, characterized in that: The following raw materials are included in mass percentage:

6. The method for preparing a seawater-degradable environmentally friendly plastic lunch box according to claims 1-5, characterized in that: The specific steps include: S1: Raw material preparation and pretreatment: PHA, PBAT / PBS, inorganic filler, antioxidant, soybean oil and thermal stabilizer are weighed respectively according to the above mass percentage requirements; S2: Ingredients and mixing: weigh the raw materials accurately according to the given proportions of PHA: 90%, PBAT / PBS: 5%, inorganic filler: 4-5%, antioxidant: 0.1%, soybean oil: 0.2%, thermal stabilizer: 0.1%; put all the raw materials into a high-speed mixer and mix them thoroughly to ensure that the components are evenly distributed; S3: melt blending, feeding the mixed raw materials into a twin-screw extruder or internal mixer for melt blending; S4: Vacuum forming, the raw materials are blended and plasticized by the screw to extrude into sheets, and then heated again and formed by vacuum forming process: S5: Cooling and demoulding. The formed lunch box is cooled in the mold to ensure that its shape and size are stable. After cooling to room temperature, the lunch box is removed from the mold for subsequent processing; S6: As needed, the product is trimmed, cleaned and dried to obtain the final seawater-degradable environmentally friendly plastic lunch box.

7. The method for preparing an environmentally friendly plastic lunch box degradable by seawater according to claim 7, wherein the product is subjected to oil-proof and waterproof treatment in S6.

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