Environment-friendly easily-degradable foaming box and preparation method thereof

Abstract

The environment-friendly easily-degradable foaming box comprises a three-layer composite structure which comprises a middle layer, an outer layer and an inner layer; the middle layer comprises the following raw materials in percentage by weight; the composite material is prepared from 50%-60% of bio-based polyester, 20%-30% of degradable polyethylene, 20%-25% of filler and 0.5%-2% of foaming The outer layer and the inner layer comprise the following raw materials in percentage by weight: 60-65% of bio-based polyester; the foaming box is made of environment-friendly materials such as bio-based polyester, degradable polyethylene and degradable polylactic acid, and the materials are easy to degrade in the natural environment, so that the pollution to the environment is reduced; meanwhile, the middle-layer sheet with a uniform closed-cell structure is formed through the heating, melting, extruding and foaming processes, the heat preservation, sound insulation and buffering performance of the foaming box is improved, the outer-layer sheet and the inner-layer sheet are subjected to waterproof treatment, good printing adaptability and waterproof performance are achieved, and subsequent processing and use are facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of foam boxes, and in particular relates to an environmentally friendly and degradable foam box and a preparation method thereof. Background Art

[0002] Foam boxes generally refer to containers with heat insulation and heat preservation functions, which are made of polystyrene (PS) as the main raw material through heating, melting, extrusion and foaming processes. They are currently widely used in the catering field, providing great convenience for industries such as takeout and fast food.

[0003] However, polystyrene (PS), the main raw material of foam boxes, is a plastic with a relatively stable chemical structure and is difficult to be decomposed by microorganisms in the natural environment. With the rapid development of industries such as takeout and fast food, the use of foam boxes has increased dramatically, and a large number of discarded foam boxes have accumulated in landfills, rivers, beaches and other places, seriously affecting the city's appearance and natural environment. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that polystyrene (PS), the main raw material of foam boxes, is a plastic with a relatively stable chemical structure and is difficult to be decomposed by microorganisms in the natural environment; with the rapid development of industries such as takeout and fast food, the use of foam boxes has increased sharply, and a large number of discarded foam boxes have accumulated in landfills, rivers, beaches and other places, seriously affecting the appearance of cities and the natural environment. Therefore, an environmentally friendly and easily degradable foam box is proposed.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: an environmentally friendly and easily degradable foam box, comprising a three-layer composite structure, which includes a middle layer, an outer layer and an inner layer;

[0006] The middle layer comprises the following raw materials in weight percentages:

[0007]

[0008]

[0009] The outer layer and the inner layer comprise the following raw materials in weight percentage:

[0010] Bio-based polyester 60%-65%

[0011] Degradable polylactic acid 35%-40%.

[0012] As a further description of the above technical solution:

[0013] The filler is natural calcium carbonate.

[0014] As a further description of the above technical solution:

[0015] The foaming agent is citrate.

[0016] As a further description of the above technical solution:

[0017] The present invention also provides a method for preparing an environmentally friendly and easily degradable foam box, comprising the following steps:

[0018] S1: Preparation of the middle layer sheet:

[0019] 1) mixing bio-based polyester, degradable polyethylene, natural calcium carbonate and foaming agent in a predetermined proportion;

[0020] 2) The mixed raw materials are fed into an extruder, and a middle layer sheet with a uniform closed-cell structure is formed through heating, melting, extrusion and foaming processes;

[0021] S2: Preparation of the outer sheet and the inner sheet:

[0022] 1) mixing the bio-based polyester and the degradable polylactic acid in a predetermined ratio;

[0023] 2) feeding the mixed raw materials into an extruder to form outer and inner sheets through heating, melting, extrusion and molding processes;

[0024] 3) performing waterproofing treatment on the surfaces of the outer layer sheet and the inner layer sheet to improve their printability and waterproof performance;

[0025] S3: Composite molding:

[0026] 1) stacking the middle layer sheet, the outer layer sheet, and the inner layer sheet in a predetermined order;

[0027] 2) The three layers of sheets are combined together through a hot pressing process to form the prototype of an environmentally friendly and easily degradable foam box;

[0028] 3) The prototype is cut and trimmed to obtain the final foam box.

[0029] As a further description of the above technical solution:

[0030] The waterproofing treatment in S3 is applying waterproof paint.

[0031] As a further description of the above technical solution:

[0032] Before waterproofing the surfaces of the outer sheet and the inner sheet in S3, a surface cleaning treatment is first performed to remove dust and oil stains on the surfaces of the outer sheet and the inner sheet.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. In the present invention, the foam box is made of environmentally friendly materials such as bio-based polyester, degradable polyethylene, and degradable polylactic acid. These materials are easily degraded in the natural environment, reducing pollution to the environment. At the same time, the middle layer sheet is formed into a middle layer sheet with a uniform closed-cell structure through heating, melting, extrusion and foaming processes, which improves the thermal insulation, sound insulation and cushioning properties of the foam box. The outer and inner layer sheets are waterproofed and have good printability and waterproof properties, which facilitates subsequent processing and use.

[0035] 2. In the present invention, the foam box adopts a three-layer composite structure, and the layers are firmly combined through a hot pressing composite process, which ensures the structural stability of the foam box while also having the characteristics of environmental protection and degradability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 It is a three-dimensional diagram of an environmentally friendly and biodegradable foam box.

[0038] Figure 2 for Figure 1 Magnified image of .

[0039] Legend:

[0040] 1-middle sheet; 2-outer sheet; 3-inner sheet; 4-foam box. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0043] 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 as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0044] 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, it does not require further definition or explanation in subsequent drawings.

[0045] In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "inner" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are orientations or positional relationships in which the inventive product is usually placed when in use. These 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 orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0046] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] See also Figure 1-2 , the present invention provides a technical solution: an environmentally friendly and easily degradable foam box, comprising a three-layer composite structure, which includes a middle layer, an outer layer and an inner layer;

[0048] The middle layer comprises the following raw materials in weight percentages:

[0049]

[0050] The outer layer and the inner layer comprise the following raw materials in weight percentage:

[0051] Bio-based polyester 60%-65%

[0052] Degradable polylactic acid 35%-40%.

[0053] The foam box made of the middle layer, outer layer and inner layer has excellent environmental performance, is easy to degrade, and the layers are firmly bonded and have a stable structure.

[0054] The filler is natural calcium carbonate, which is used to enhance the structural strength of the material at a low cost while maintaining the environmentally friendly and easily degradable properties.

[0055] The foaming agent is citrate, which is environmentally friendly and non-toxic, helps to form a uniform foaming structure, and improves the thermal insulation, sound insulation and cushioning properties of the foam box.

[0056] The present invention also provides a method for preparing an environmentally friendly and easily degradable foam box, comprising the following steps:

[0057] S1: Preparation of the middle layer sheet 1:

[0058] 1) mixing bio-based polyester, degradable polyethylene, natural calcium carbonate and foaming agent in a predetermined proportion;

[0059] 2) feeding the mixed raw materials into an extruder to form a middle layer sheet 1 having a uniform closed-cell structure through heating, melting, extrusion and foaming processes;

[0060] S2: Preparation of the outer layer sheet 2 and the inner layer sheet 3:

[0061] 1) mixing the bio-based polyester and the degradable polylactic acid in a predetermined ratio;

[0062] 2) feeding the mixed raw materials into an extruder, and forming the outer layer sheet 2 and the inner layer sheet 3 through heating, melting, extrusion and molding processes;

[0063] 3) performing waterproof treatment on the surfaces of the outer layer sheet 2 and the inner layer sheet 3 to improve their printability and waterproof performance;

[0064] S3: Composite molding:

[0065] 1) stacking the middle layer sheet 1, the outer layer sheet 2, and the inner layer sheet 3 in a predetermined order;

[0066] 2) The three layers of sheets are combined together through a hot pressing process to form the prototype of an environmentally friendly and easily degradable foam box;

[0067] 3) The prototype is cut and trimmed to obtain the final foam box 4.

[0068] The waterproof treatment in S3 is to apply waterproof pigment to improve its printability and waterproof performance.

[0069] Before waterproofing the outer sheet 2 and the inner sheet 3 in S3, the surface is cleaned to remove dust and oil on the surface of the outer sheet 2 and the inner sheet 3. The outer sheet 2 and the inner sheet 3 are firmly bonded to the surface of the middle sheet, which can effectively improve the waterproof performance of the foam box.

[0070] The foamed middle layer sheet needs to be cooled and shaped immediately after extrusion to prevent the cells from continuing to expand or deform.

[0071] Working principle: The foam box is made of environmentally friendly materials such as bio-based polyester, degradable polyethylene, and degradable polylactic acid. These materials are easily degraded in the natural environment, reducing pollution to the environment. At the same time, the middle layer sheet is formed into a middle layer sheet with a uniform closed-cell structure through heating, melting, extrusion and foaming processes, which improves the thermal insulation, sound insulation and cushioning properties of the foam box. The outer and inner sheets are waterproofed and have good printability and waterproof properties, which is convenient for subsequent processing and use. In addition, the foam box adopts a three-layer composite structure, and the layers are firmly combined through a hot pressing composite process to ensure the structural stability of the foam box while also having environmentally friendly and degradable characteristics.

[0072] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An environmentally friendly and easily degradable foam box, characterized in that: comprising a three-layer composite structure comprising a middle layer, an outer layer, and an inner layer; The middle layer comprises the following raw materials in weight percentages: The outer layer and the inner layer comprise the following raw materials in weight percentage: Bio-based polyester 60%-65% Degradable polylactic acid 35%-40%.

2. The environmentally friendly and biodegradable foam box according to claim 1, characterized in that: The filler is natural calcium carbonate.

3. The environmentally friendly and biodegradable foam box according to claim 2, characterized in that: The foaming agent is citrate.

4. The method for preparing an environmentally friendly and easily degradable foam box according to claims 1-3, characterized in that: The following steps are involved: S1: Preparation of the middle layer sheet: 1) mixing bio-based polyester, degradable polyethylene, natural calcium carbonate and foaming agent in a predetermined proportion; 2) The mixed raw materials are fed into an extruder, and a middle layer sheet with a uniform closed-cell structure is formed through heating, melting, extrusion and foaming processes; S2: Preparation of the outer sheet and the inner sheet: 1) mixing the bio-based polyester and the degradable polylactic acid in a predetermined ratio; 2) feeding the mixed raw materials into an extruder to form outer and inner sheets through heating, melting, extrusion and molding processes; 3) performing waterproofing treatment on the surfaces of the outer layer sheet and the inner layer sheet to improve their printability and waterproof performance; S3: Composite molding: 1) stacking the middle layer sheet, the outer layer sheet, and the inner layer sheet in a predetermined order; 2) The three layers of sheets are combined together through a hot pressing process to form the prototype of an environmentally friendly and easily degradable foam box; 3) The prototype is cut and trimmed to obtain the final foam box.

5. The environmentally friendly and biodegradable foam box according to claim 4, characterized in that: The waterproofing treatment in S3 is applying waterproof paint.

6. The method for preparing an environmentally friendly and easily degradable foam box according to claim 5, characterized in that: Before waterproofing the surfaces of the outer sheet and the inner sheet in S3, a surface cleaning treatment is first performed to remove dust and oil stains on the surfaces of the outer sheet and the inner sheet.

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