High-dispersity bio-based full-biodegradable mulching film and preparation method thereof

Abstract

The invention discloses a high-dispersity bio-based full-biodegradable mulching film and a preparation method thereof. The high-dispersity bio-based full-biodegradable mulching film is prepared from the following raw materials in parts by weight: 72-91 parts of PBAT, 3-8 parts of PLA, 3-10 parts of lignin modified carbon black and 1.5-5 parts of a processing aid, the lignin-modified carbon black is prepared by the following method: lignin, carbon black and a dispersing aid are mixed in an airflow crushing process, the lignin-modified carbon black is obtained after crushing, and the particle size distribution of the lignin-modified carbon black is that D50 is less than or equal to 3 microns and D100 is less than or equal to 10 microns. Lignin and carbon black are subjected to airflow pulverization modification through the dispersing auxiliary, the binding force of lignin and carbon black is enhanced, and compatibility and dispersity are improved; after crushing, the particle size is reduced, PBAT molecular gaps can be filled, and the barrier property of the mulching film is improved; in addition, the lignin modified carbon black is directly used for replacing black masterbatch, the process is simplified, and the cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and in particular relates to a highly dispersible bio-based fully biodegradable ground film and a preparation method thereof. Background Art

[0002] Biodegradable mulch is a new type of ground covering film, mainly used for ground covering. It can increase soil temperature, retain soil moisture, maintain soil structure, and prevent pests from invading crops and diseases caused by certain microorganisms.

[0003] In existing technology, the production of black, fully biodegradable mulch requires first preparing or purchasing a black masterbatch through mixing and extrusion. This is then blended with a fully biodegradable resin, a modifying material, the black masterbatch, and related additives to create a modified masterbatch, which is then blown into film. However, this method presents challenges such as high cost, difficult processing, and complex manufacturing processes. The entire production process not only has high operating costs but also low filler content and poor dispersibility. To improve dispersibility, existing methods often increase the amount of dispersant and lubricant used, but this further increases costs, making the widespread use of biodegradable mulch difficult. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the present invention provides a highly dispersible bio-based fully biodegradable ground film and a preparation method thereof.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In one aspect, the present invention provides a highly dispersible bio-based fully biodegradable ground film, which is prepared from the following raw materials in parts by weight:

[0007] PBAT 72-91 parts, PLA 3-8 parts, lignin-modified carbon black 3-10 parts, processing aid 1.5-5 parts;

[0008] The lignin-modified carbon black is prepared by the following method: lignin, carbon black and a dispersing aid are mixed during air flow pulverization, and the lignin-modified carbon black is obtained after pulverization. The particle size distribution of the lignin-modified carbon black is D50≤3μm and D100≤10μm.

[0009] As a further solution of the present invention: the melt index of the PBAT is 1 to 8 g / 10 min, and the terminal carboxyl group content is ≤20 mol / t.

[0010] As a further embodiment of the present invention: the carbon black is high-pigment carbon black;

[0011] And / or, the amount of carbon black is 5% to 30% of the amount of lignin.

[0012] As a further embodiment of the present invention: the dispersibility aid is at least one of stearic acid, zinc stearate and calcium stearate;

[0013] And / or, the amount of the dispersibility aid used is 0.5% to 5% of the amount of the lignin used.

[0014] As a further solution of the present invention: the bio-based fully biodegradable mulch film is prepared from the following raw materials in parts by weight: 88 parts of PBAT, 5 parts of PLA, 7 parts of lignin-modified carbon black, and 1.5 to 5 parts of processing aids.

[0015] As a further solution of the present invention: the processing aid includes 0.2-0.7 parts of plasticizer, 0.5-1.2 parts of ultraviolet absorber, 0.5-1.5 parts of light stabilizer, 0.3-1 parts of antioxidant, and 0.4-0.7 parts of anti-blocking agent.

[0016] As a further embodiment of the present invention: the plasticizer is at least one of tributyl citrate TBC, acetyl tri-n-butyl citrate ATBC, and polyethylene glycol;

[0017] And / or, the ultraviolet absorber is at least one of UV-531, UV-326, and UV-1577;

[0018] and / or, the light stabilizer is a hindered amine light stabilizer, such as 783, 944, 622;

[0019] And / or, the antioxidant is a combination of a phenolic antioxidant 1010 and a phosphite auxiliary antioxidant 168;

[0020] And / or, the opening agent is erucamide and / or oleamide.

[0021] As a further solution of the present invention: the thickness of the bio-based fully biodegradable ground film is 6 to 13 μm, for example, 10 μm.

[0022] In another aspect, the present invention provides a method for preparing a highly dispersible bio-based fully biodegradable mulch film, which specifically comprises the following steps:

[0023] (1) uniformly mixing PBAT, PLA, lignin-modified carbon black, and processing aids to obtain a primary mixture;

[0024] (2) adding the primary mixed material into the hopper of a twin-screw extruder, extruding at 140-170° C., and granulating with air cooling or water cooling to obtain a masterbatch;

[0025] (3) The masterbatch is put into a film blowing machine and blown into film at 140-165° C. to obtain the bio-based fully biodegradable ground film.

[0026] The beneficial effects of the present invention are:

[0027] 1) The present invention utilizes a dispersant to mix lignin and carbon black, followed by airflow pulverization and modification. During the pulverization process, the lignin, carbon black, and dispersant collide with each other under the action of the airflow, thereby achieving surface modification and increasing the bonding strength between the lignin and carbon black. This modification process effectively improves the compatibility and dispersibility of the two during use.

[0028] 2) After airflow milling modification, the particle size of the material of the present invention is significantly reduced. During use, this fine particle size can fill the problem of excessive gaps between PBAT molecules, thereby improving the poor barrier properties of the PBAT film itself to a certain extent.

[0029] 3) The present invention directly uses lignin / carbon black to replace or reduce the use of black masterbatch, achieving coloring. This not only simplifies the processing technology but also reduces production costs, providing a powerful foundation for the wider application of fully biodegradable mulch films. DETAILED DESCRIPTION

[0030] The present invention is further illustrated by examples below, but the invention is not limited to these examples. Experimental methods in the following examples, where specific conditions are not specified, were performed according to conventional methods and conditions, or according to commercial product specifications. Furthermore, all reagents and raw materials used in the present invention are commercially available. In the following examples and comparative examples, the PBAT melt index was 3.8 g / 10 min, and the carboxyl end group content was 10 to 15 mol / t.

[0031] Example 1

[0032] A highly dispersible bio-based fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0033] 85 parts of PBAT, 5 parts of PLA, 5 parts of lignin-modified carbon black, and 2.5 parts of processing aid;

[0034] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 5 parts of high-pigment carbon black, and 2 parts of stearic acid are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=2μm and D100=8μm.

[0035] Among them, the processing aids are 0.25 parts of ATBC, 0.5 parts of UV-531, 0.7 parts of 944, 0.4 parts of 1010, 0.2 parts of 168, and 0.45 parts of erucamide.

[0036] A method for preparing a highly dispersible bio-based fully biodegradable mulch film comprises the following steps:

[0037] 1. Accurately weigh the corresponding materials according to the composition;

[0038] 2. Place PBAT, PLA, processing aid, and lignin-modified carbon black in a high-speed blender and mix at a speed of 200 rpm for 15 minutes to obtain a primary mixture;

[0039] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 140°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 145°C to prepare a 0.01 mm ground film.

[0040] Example 2

[0041] A highly dispersible bio-based fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0042] 83 parts of PBAT, 5 parts of PLA, 7 parts of lignin-modified carbon black, and 4 parts of processing aid;

[0043] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 30 parts of high-pigment carbon black, and 2 parts of zinc stearate are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=1.83μm and D100=8.3μm.

[0044] Among them, the processing aids are 0.4 parts of ATBC, 1.2 parts of UV-531, 0.5 parts of 783, 0.5 parts of 622, 0.3 parts of 1010, 0.3 parts of 168, and 0.7 parts of erucamide.

[0045] A method for preparing a highly dispersible bio-based fully biodegradable mulch film comprises the following steps:

[0046] 1. Accurately weigh the corresponding materials according to the composition;

[0047] 2. Place PBAT, PLA, processing aid, and lignin-modified carbon black in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0048] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 170°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 165°C to prepare a 0.01 mm ground film.

[0049] Example 3

[0050] A highly dispersible bio-based fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0051] 83 parts of PBAT, 5 parts of PLA, 7 parts of lignin-modified carbon black, and 3.5 parts of processing aids;

[0052] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 15 parts of high-pigment carbon black, and 2 parts of zinc stearate are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=1.53μm and D100=9.1μm.

[0053] Among them, the processing aids are 0.3 parts of ATBC, 1 part of UV-326, 0.5 parts of 783, 0.5 parts of 622, 0.4 parts of 1010, 0.4 parts of 168, and 0.7 parts of erucamide.

[0054] A method for preparing a highly dispersible bio-based fully biodegradable mulch film comprises the following steps:

[0055] 1. Accurately weigh the corresponding materials according to the composition;

[0056] 2. Place PBAT, PLA, processing aid, and lignin-modified carbon black in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0057] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 150°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 150°C to prepare a 0.01 mm ground film.

[0058] Example 4

[0059] A highly dispersible bio-based fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0060] 82 parts of PBAT, 4 parts of PLA, 10 parts of lignin-modified carbon black, and 4.8 parts of processing aid;

[0061] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 15 parts of high-pigment carbon black, and 5 parts of zinc stearate are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=1.93μm and D100=9.3μm.

[0062] Among them, the processing aids are 0.6 parts of ATBC, 1.2 parts of UV-326, 1.5 parts of light stabilizer 944, 0.4 parts of 1010, 0.4 parts of 168, and 0.7 parts of erucamide.

[0063] A method for preparing a highly dispersible bio-based fully biodegradable mulch film comprises the following steps:

[0064] 1. Accurately weigh the corresponding materials according to the composition;

[0065] 2. Place PBAT, PLA, processing aid, and lignin-modified carbon black in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0066] 3. The primary mixture was transferred to a twin-screw extruder and extruded at 160°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine and blown at 160°C to prepare a 0.01 mm ground film.

[0067] Example 5

[0068] A highly dispersible bio-based fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0069] 85 parts of PBAT, 5 parts of PLA, 5 parts of lignin-modified carbon black, and 3 parts of processing aid;

[0070] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 30 parts of high-pigment carbon black, and 0.5 parts of calcium stearate are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=1.23μm and D100=7.3μm.

[0071] Among them, the processing aids are 0.3 parts of ATBC, 0.7 parts of UV-1577, 0.5 parts of 783, 0.5 parts of 622, 0.3 parts of 1010, 0.3 parts of 168, and 0.4 parts of erucamide.

[0072] A method for preparing a highly dispersible bio-based fully biodegradable mulch film comprises the following steps:

[0073] 1. Accurately weigh the corresponding materials according to the composition;

[0074] 2. Place PBAT, PLA, processing aid, and lignin-modified carbon black in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0075] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 150°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 150°C to prepare a 0.01 mm ground film.

[0076] Example 6

[0077] A highly dispersible bio-based fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0078] 88 parts of PBAT, 4 parts of PLA, 4 parts of lignin-modified carbon black, and 3.1 parts of processing aid;

[0079] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 30 parts of high-pigment carbon black, and 2 parts of zinc stearate are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=1.53μm and D100=9.1μm.

[0080] Among them, the processing aids are 0.3 parts of ATBC, 0.8 parts of UV-326, 0.8 parts of light stabilizer 944, 0.4 parts of 1010, 0.4 parts of 168, and 0.4 parts of oleamide.

[0081] A method for preparing a highly dispersible bio-based fully biodegradable mulch film comprises the following steps:

[0082] 1. Accurately weigh the corresponding materials according to the composition;

[0083] 2. Place PBAT, PLA, processing aid, and lignin-modified carbon black in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0084] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 140°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 165°C to prepare a 0.01 mm ground film.

[0085] Comparative Example 1

[0086] A fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0087] 85 parts of PBAT, 5 parts of PLA, 5 parts of degraded masterbatch, 5 parts of lignin powder, 2.5 parts of processing aid;

[0088] Among them, the processing aids are 0.25 parts of ATBC, 0.5 parts of UV-531, 0.7 parts of 944, 0.4 parts of 1010, 0.2 parts of 168, and 0.45 parts of erucamide.

[0089] A method for preparing a fully biodegradable mulch film comprises the following steps:

[0090] 1. Accurately weigh the corresponding materials according to the composition;

[0091] 2. Place PBAT, PLA, degradation masterbatch, processing aids, and lignin powder in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0092] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 140°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 145°C to prepare a 0.01 mm ground film.

[0093] Comparative Example 2

[0094] A fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0095] 82 parts of PBAT, 4 parts of PLA, 4 parts of degradation masterbatch, 10 parts of inorganic filler, 4.8 parts of processing aid;

[0096] The inorganic filler is calcium carbonate with a particle size of 1250 to 5000 meshes.

[0097] Among them, the processing aids are 0.6 parts of ATBC, 1.2 parts of UV-326, 1.5 parts of light stabilizer 944, 0.4 parts of 1010, 0.4 parts of 168, and 0.7 parts of erucamide.

[0098] A method for preparing a fully biodegradable mulch film comprises the following steps:

[0099] 1. Accurately weigh the corresponding materials according to the composition;

[0100] 2. Place PBAT, PLA, degradation masterbatch, processing aid, and inorganic filler in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0101] 3. The primary mixture was transferred to a twin-screw extruder and extruded at 160°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine and blown at 160°C to prepare a 0.01 mm ground film.

[0102] Comparative Example 3

[0103] A fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0104] 83 parts of PBAT, 5 parts of PLA, 5 parts of degraded masterbatch, 7 parts of lignin-modified carbon black, and 3.5 parts of processing aid;

[0105] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 15 parts of high-pigment carbon black, and 2 parts of zinc stearate are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=1.53μm and D100=9.1μm.

[0106] Among them, the processing aids are 0.3 parts of ATBC, 1 part of UV-326, 0.5 parts of 783, 0.5 parts of 622, 0.4 parts of 1010, 0.4 parts of 168, and 0.7 parts of erucamide.

[0107] A method for preparing a fully biodegradable mulch film comprises the following steps:

[0108] 1. Accurately weigh the corresponding materials according to the composition;

[0109] 2. Place PBAT, PLA, degradation masterbatch, processing aid, and lignin-modified carbon black in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0110] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 150°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 150°C to prepare a 0.01 mm ground film.

[0111] Comparative Example 4

[0112] A fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0113] 88 parts of PBAT, 4 parts of PLA, 4 parts of degraded masterbatch, 4 parts of lignin-modified carbon black, 3.1 parts of processing aid;

[0114] Among them, lignin-modified carbon black is prepared by the following method: 100 parts of lignin raw powder, 30 parts of high-pigment carbon black, and 2 parts of zinc stearate are mixed in a jet milling process, and lignin-modified carbon black is obtained after milling. The particle size after milling is D50=1.53μm and D100=9.1μm.

[0115] Among them, the processing aids are 0.3 parts of ATBC, 0.8 parts of UV326, 0.8 parts of light stabilizer 944, 0.4 parts of 1010, 0.4 parts of 168, and 0.4 parts of oleamide.

[0116] A method for preparing a fully biodegradable mulch film comprises the following steps:

[0117] 1. Accurately weigh the corresponding materials according to the composition;

[0118] 2. Place PBAT, PLA, degradation masterbatch, processing aid, and lignin-modified carbon black in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0119] 3. The above primary mixture was transferred to a twin-screw extruder for extrusion at 140°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine for film blowing at 165°C to prepare a 0.01 mm ground film.

[0120] Comparative Example 5

[0121] The only difference from Example 2 is that no dispersing aid is added in the preparation of lignin-modified carbon black.

[0122] Comparative Example 6

[0123] The only difference from Example 2 is that zinc stearate is replaced by vinyl bisstearamide in the preparation of lignin-modified carbon black.

[0124] Comparative Example 7

[0125] The only difference from Example 2 is that the processing aid does not include an anti-blocking agent.

[0126] Comparative Example 8

[0127] A fully biodegradable ground film is prepared from the following raw materials in parts by weight:

[0128] 83 parts of PBAT, 5 parts of PLA, 6 parts of lignin powder, 1 part of high-pigment carbon black, 0.2 parts of zinc stearate, and 4 parts of processing aids;

[0129] Among them, the processing aids are 0.4 parts of ATBC, 1.2 parts of UV-531, 0.5 parts of 783, 0.5 parts of 622, 0.3 parts of 1010, 0.3 parts of 168, and 0.7 parts of erucamide.

[0130] A method for preparing a fully biodegradable mulch film comprises the following steps:

[0131] 1. Accurately weigh the corresponding materials according to the composition;

[0132] 2. Place PBAT, PLA, processing aid, lignin powder, high pigment carbon black, and zinc stearate in a high-speed blender and mix at 200 rpm for 15 minutes to obtain a primary mixture;

[0133] 3. The primary mixture was transferred to a twin-screw extruder and extruded at 170°C, air-cooled and granulated to obtain degradation masterbatch, which was then transferred to a film blowing machine and blown at 165°C to prepare a 0.01 mm ground film.

[0134] Effect embodiment

[0135] The performance of the mulch films prepared in Examples 1 to 6 and Comparative Examples 1 to 8 was tested using a universal electronic tensile testing machine (KY8000C) in accordance with the standard GB / T 1040.2-2006. The specific data are shown in Table 1.

[0136] Table 1

[0137]

[0138]

[0139] The results show that the highly dispersible bio-based fully biodegradable mulch film of the present invention has good mechanical properties and fully meets the use standards. The mechanical properties of the implementation cases are better than those of the comparison cases.

[0140] Finally, it should be noted that in the present invention, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0141] Although the present disclosure has been disclosed above through the description of the specific embodiments of the present disclosure, it should be understood that those skilled in the art may design various modifications, improvements or equivalents of the present disclosure within the spirit and scope of the attached solutions. Such modifications, improvements or equivalents should also be considered to be included in the scope of protection claimed by the present disclosure.

Claims

1. A highly dispersible bio-based fully biodegradable ground film, characterized in that: Prepared from the following raw materials in parts by weight: PBAT 72-91 parts, PLA 3-8 parts, lignin-modified carbon black 3-10 parts, processing aid 1.5-5 parts; The lignin-modified carbon black is prepared by the following method: lignin, carbon black and a dispersing aid are mixed during air flow pulverization, and the lignin-modified carbon black is obtained after pulverization. The particle size distribution of the lignin-modified carbon black is D50≤3μm and D100≤10μm.

2. The highly dispersible bio-based fully biodegradable ground film according to claim 1, characterized in that: The PBAT has a melt index of 1 to 8 g / 10 min and a terminal carboxyl content of ≤20 mol / t.

3. The highly dispersible bio-based fully biodegradable ground film according to claim 1, characterized in that: The carbon black is high pigment carbon black; And / or, the amount of carbon black is 5% to 30% of the amount of lignin.

4. The highly dispersible bio-based fully biodegradable ground film according to claim 1, characterized in that: The dispersibility aid is at least one of stearic acid, zinc stearate and calcium stearate; And / or, the amount of the dispersibility aid used is 0.5% to 5% of the amount of the lignin used.

5. The highly dispersible bio-based fully biodegradable ground film according to claim 1, characterized in that: The bio-based fully biodegradable mulch film is prepared from the following raw materials in parts by weight: 88 parts of PBAT, 5 parts of PLA, 7 parts of lignin-modified carbon black, and 1.5 to 5 parts of a processing aid.

6. The highly dispersible bio-based fully biodegradable ground film according to claim 1, characterized in that: The processing aid comprises 0.2 to 0.7 parts of a plasticizer, 0.5 to 1.2 parts of an ultraviolet absorber, 0.5 to 1.5 parts of a light stabilizer, 0.3 to 1 parts of an antioxidant, and 0.4 to 0.7 parts of an anti-blocking agent.

7. The highly dispersible bio-based fully biodegradable ground film according to claim 1, characterized in that: The plasticizer is at least one of tributyl citrate TBC, acetyl tri-n-butyl citrate ATBC, and polyethylene glycol; And / or, the ultraviolet absorber is at least one of UV-531, UV-326, and UV-1577; and / or, the light stabilizer is a hindered amine light stabilizer, such as 783, 944, 622; And / or, the antioxidant is a combination of a phenolic antioxidant 1010 and a phosphite auxiliary antioxidant 168; And / or, the opening agent is erucamide and / or oleamide.

8. The highly dispersible bio-based fully biodegradable ground film according to claim 1, characterized in that: The thickness of the bio-based fully biodegradable ground film is 6 to 13 μm, for example, 10 μm.

9. The method for preparing a highly dispersible bio-based fully biodegradable ground film according to claims 1 to 8, characterized in that: The specific steps include: (1) uniformly mixing PBAT, PLA, lignin-modified carbon black, and processing aids to obtain a primary mixture; (2) adding the primary mixed material into the hopper of a twin-screw extruder, extruding at 140-170° C., and granulating with air cooling or water cooling to obtain a masterbatch; (3) The masterbatch is put into a film blowing machine and blown into film at 140-165° C. to obtain the bio-based fully biodegradable ground film.

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