Biodegradable multi-layer extrusion environment-friendly sheet structure

Abstract

The utility model discloses a biodegradable multi-layer extrusion environment-friendly sheet structure, which relates to the technical field of biodegradable sheets and comprises a base layer A made of PLA (polylactic acid) materials; the base layer B is made of a PLA material; the base layer C is made of a PBS material; a three-layer or multi-layer sheet is prepared through multi-layer sheet co-extrusion equipment; the surface layer of the multi-layer structure is made of a low-migration-quantity full-biodegradable material such as polylactic acid (PLA) as a main material or an alloy material with PLA as a main material, the middle layer or multiple layers are made of a blending alloy material with PBS as a main material, the excellent toughness and temperature resistance of the PBS are utilized, the rigidity, strength and low migration characteristics of the PLA material of the surface layer are matched, and the surface layer is made of a biodegradable material. And a packaging product is prepared through a blister process, so that the sheet and the blister packaging product have the properties of safe food contact use and high temperature resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of biodegradable sheets, in particular to a biodegradable multi-layer extruded environmentally friendly sheet structure. Background Art

[0002] PBS is a biodegradable material. Its Chinese full name is polybutylene succinate. PBS has excellent toughness and tensile strength. PBS has good heat resistance and its heat deformation temperature is close to 100℃. However, due to its low modulus and insufficient rigidity, its application in many fields such as disposable straws and tableware, food packaging, 3D printing materials, etc. is seriously limited. The incomplete purification during the synthesis of PBS itself causes the residual small molecules to migrate in the total migration test of food contact, especially in ethanol solutions above 50%. The total migration is the largest. PBS is blended with other degradable materials to modify alloys. For example, a large amount of PBS raw materials needs to be added to PLA+PBS alloy materials, which will make it difficult for food packaging products prepared by PLA+PBS alloy materials to meet the requirements of total migration of food contact materials ≤10mg / dm2. If the PBS content is low, the heat resistance of PBS alloy will be poor. In addition, PBS has excellent toughness and tensile strength, but due to its low modulus and insufficient rigidity, its application in food contact packaging fields such as disposable tableware and blister food packaging is seriously limited. At present, it is difficult for fully biodegradable PBS alloy materials to simultaneously meet the requirements of excellent heat resistance (HDT>88℃) and food contact (total migration amount in 50% ethanol simulant ≤10mg / dm2) when in contact with food. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides a biodegradable multi-layer extruded environmentally friendly sheet structure, in which a three-layer or multi-layer sheet is prepared through a multi-layer co-extrusion sheet equipment. The surface layer of the multi-layer structure adopts a low-migration fully biodegradable material such as polylactic acid PLA as the main material, and the middle layer or multiple layers adopt a blended alloy material with PBS as the main material, thereby solving the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: a biodegradable multi-layer extruded environmentally friendly sheet structure, comprising:

[0005] Base layer A1, base layer A1 is PLA material;

[0006] Base layer C3, base layer C3 is PBS material;

[0007] The base layer A1 and the base layer C3 are integrally formed multi-layer extruded sheets.

[0008] Preferably, the base layer A1 and the base layer C3 are integrally formed into a multi-layer extruded sheet material, which is a sheet material A12, and the sheet material A12 is used to make a container by a vacuum forming machine.

[0009] Preferably, a biodegradable multi-layer extruded environmentally friendly sheet structure comprises:

[0010] Base layer A1, base layer A1 is PLA material;

[0011] Base layer B2, base layer B2 is made of PLA material;

[0012] Base layer C3, base layer C3 is PBS material;

[0013] A base layer C3 is disposed in the middle of the base layer A1 and the base layer B2, and the base layers A1, B2 and C3 form a core-shell structure.

[0014] Preferably, the base layer A1, base layer C3 and base layer B2 are integrally formed into a multi-layer extruded sheet, which is a sheet B13, and the sheet B13 is used to make a container by a vacuum forming machine.

[0015] Preferably, the base layer A1 is the inner surface layer of the container and contacts the food through the inner surface layer.

[0016] Preferably, the sheet material B13 can be used to make a water cup or a lunch box, and the water cup or the lunch box made of the sheet material B13 can be used for high-temperature heating.

[0017] The utility model provides a biodegradable multi-layer extruded environmentally friendly sheet structure. Compared with the prior art, it has the following beneficial effects:

[0018] The patent technology has two points: a three-layer or multi-layer sheet is prepared by a multi-layer co-extrusion sheet equipment, the multi-layer structure surface layer adopts a low migration amount of fully biodegradable material such as polylactic acid (PLA) as the main material, and the middle layer or multiple layers adopt a blended alloy material with PBS as the main material. The excellent toughness and heat resistance of PBS are used, and the rigidity, strength and low migration characteristics of the surface layer PLA material are combined to prepare a multi-layer co-extruded sheet that meets the requirements of food contact, and the packaging products are prepared through the blister process, so that the temperature resistance of the sheet and the blister packaging products is improved and can contact food. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a sheet B having a biodegradable multi-layer extruded environmentally friendly sheet structure;

[0020] Figure 2 A schematic diagram of a biodegradable multi-layer extruded environmentally friendly sheet structure;

[0021] Figure 3 A biodegradable multi-layer extruded environmentally friendly sheet structure product Figure 1 ;

[0022] Figure 4A biodegradable multi-layer extruded environmentally friendly sheet structure product Figure 2 .

[0023] In the figure: 1. base layer A; 2. base layer B, 3. base layer C; 12. sheet material A; 13. sheet material B. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 As shown, the utility model provides a biodegradable multi-layer extruded environmentally friendly sheet structure

[0026] Structure, including:

[0027] Base layer A1, base layer A1 is PLA material;

[0028] Base layer C3, base layer C3 is PBS material;

[0029] The base layer A1 and the base layer C3 are integrally formed multi-layer extruded sheets.

[0030] See also Figure 2 As shown, it also includes a biodegradable multi-layer extruded environmentally friendly sheet structure,

[0031] include:

[0032] Base layer A1, base layer A1 is PLA material;

[0033] Base layer B2, base layer B2 is made of PLA material;

[0034] Base layer C3, base layer C3 is PBS material;

[0035] A base layer C3 is disposed in the middle of the base layer A1 and the base layer B2, and the base layers A1, B2 and C3 form a core-shell structure.

[0036] See also Figure 3-4 As shown, the base layer A1 and the base layer C3 are integrally formed into a multi-layer extruded sheet material, which is a sheet material A12, and the sheet material A12 is used to make a container by a blister machine;

[0037] The base layer A1, base layer C3 and base layer B2 are integrally formed into a multi-layer extruded sheet as a sheet B13, and the sheet B13 is used to make a container by a vacuum forming machine; the base layer A1 is the inner surface layer of the container, and contacts the food through the inner surface layer; the sheet B13 can be used to make a water cup or a lunch box, and the water cup or lunch box made of the sheet B13 can be used for high-temperature heating.

[0038] It should be noted that the material used to make the base layer A1 is PLA, and the base layer C3 is PBS. These are existing technology products that can be purchased on the market, so there is no need to conduct detailed chemical analysis of the existing technology products.

[0039] In addition, when the base layer A1 is produced, that is, the sheet A12 material is made, the formula weight parts needed are: base layer A1PLA 50-100 parts, base layer C3PBS 20-100 parts, talcum powder 5-30 parts, lubricant 0.2-0.5 parts, compatibilizer 1-4 parts;

[0040] In addition, when the base layer A1, base layer C3 and base layer B2 are produced, that is, when making the sheet material B13, the formula weight parts needed are: base layer A1 PLA 50-100 parts, base layer C3 PBS 20-100 parts, base layer B2 PLA 50-100 parts talc powder 5-30 parts, lubricant 0.2-0.5 parts, compatibilizer 1-4 parts;

[0041] In addition, the following information is required in the specification: PBS alloy material is composed of PBS content of more than 20% and other biodegradable materials including but not limited to the following varieties: PLA / PHA / PBAT / PCL / PPC / PGA, and other inorganic materials including but not limited to the following varieties: talc / calcium carbonate / mica / barium sulfate / calcium sulfate, etc.

[0042] PLA alloy material is composed of PLA content of more than 30% and other biodegradable materials including but not limited to the following varieties: PBS / PHA / PBAT / PCL / PPC / PGA, etc., and other inorganic materials including but not limited to the following varieties: talc / calcium carbonate / mica / barium sulfate / calcium sulfate, etc.;

[0043] The PBs alloy material and the PLA alloy material are prepared by extrusion granulation process or other blending granulation process, and the prepared granules are used to produce the base sheet of the patented product.

[0044] By using the above weights, multiple layers of different sheets can be produced, and the produced sheets can be further processed using existing blister machines to produce products that can come into contact with food, such as lunch boxes, bowls, or cups for daily use.

Claims

1. A biodegradable multi-layer extruded environmentally friendly sheet structure, characterized in that: include: Base layer A (1), the base layer A (1) is a PLA material; Base layer C (3), base layer C (3) is PBS material; The base layer A (1) and the base layer C (3) are integrally formed multi-layer extruded sheets.

2. The biodegradable multi-layer extruded environmentally friendly sheet structure according to claim 1, characterized in that: The base layer A (1) and the base layer C (3) are integrally formed into a multi-layer extruded sheet material, namely a sheet material A (12), and the sheet material A (12) is used to make a container by a vacuum forming machine.

3. The biodegradable multi-layer extruded environmentally friendly sheet structure according to claim 2, characterized in that: The base layer A (1) is the inner surface layer of the container and is in contact with the food through the inner surface layer.

4. A biodegradable multi-layer extruded environmentally friendly sheet structure, characterized in that: include: Base layer A (1), the base layer A (1) is a PLA material; Base layer B (2), the base layer B (2) is a PLA material; Base layer C (3), base layer C (3) is PBS material; A base layer C (3) is disposed in the middle of the base layer A (1) and the base layer B (2), and the base layer A (1), the base layer B (2) and the base layer C (3) form a core-shell structure.

5. The biodegradable multi-layer extruded environmentally friendly sheet structure according to claim 4, characterized in that: The base layer A (1), the base layer C (3) and the base layer B (2) are integrally formed into a multi-layer extruded sheet material, namely a sheet material B (13), and the sheet material B (13) is used to make a container by a vacuum forming machine.

6. The biodegradable multi-layer extruded environmentally friendly sheet structure according to claim 4, characterized in that: The sheet material B (13) can be used to make a water cup or a lunch box. The water cup or the lunch box made of the sheet material B (13) can be used for high-temperature heating.

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