Agricultural nanofilm and its manufacturing method

Abstract

The present invention relates to an agricultural nanofilm and its manufacturing method. Nano-fertilizers, nano-plant fibers, and / or nano-carbon fibers and / or nano-bamboo charcoal are uniformly dispersed within the film, with the average particle size of each element being less than 45 microns. The film is made from a biodegradable lipid-generated material, mixed with nano-sized dry fertilizer particles and plant particles, and then thermally coated to form an upper and lower layer of the film, uniformly distributed with nano-fertilizers and / or nano-plant fibers. During agricultural use, the film gradually releases plant nutrients into the soil, starting from the shady side and progressing upwards according to the degradation level. This invention provides a method for gradually releasing and / or converting nutrients required by plants during agricultural use, according to the degradation level's differentiated timeline, while also preventing the photosynthetic growth of weeds.

Description

Technical Field

[0001] The present invention relates to an agricultural nanofilm and a method for manufacturing the same. Background Art

[0002] In order to prevent weeds from growing, agricultural planting is done by covering the surface of the field with mulch, avoiding the planting area. In addition to preventing weeds from growing, the mulch also helps maintain soil moisture and prevent insects from breeding.

[0003] Traditional mulch films are made of high-molecular plasticized materials that are blown and then cut into films. Since these materials are plasticized polymers, they will cause plastic pollution to the soil after use. New mulch films made of degradable materials can greatly improve the plastic pollution to the soil. They are also added with plant fragments, hoping that they will be released during the degradation process of the mulch film and converted into nutrients needed by plants. The particle size of the fragments is large and can be clearly seen with the naked eye. They are thin relative to the thickness of the mulch film. Therefore, the particle size is large in proportion to the thickness of the mulch film. Sand holes or deflocculation of plant fibers will form on the surface of the mulch film. The defects formed cause tension weaknesses, which greatly affect the tensile strength of the mulch film. In addition, after the plant fibers are released, they still need to be corroded by bacteria to decompose and convert into nutrients.

[0004] Conventional ground films are produced by blowing with air pressure, where the hot-melt substrate is expanded into a thin layer by air pressure and then cut into films such as plastic bags. However, since the plant particles are relatively large in size compared to the thickness of the ground film, and the size is about one-tenth of the film thickness, the plant fiber itself does not have the ability to spread, and the contact surface with the hot-melt substrate will peel off due to different deformation rates, causing holes in the film surface. Even if the ratio is not high enough to cause holes, the fiber structure will be exposed on the film surface, and deflocculation will occur during the winding or laying operations due to external force. If deflocculation is not achieved, the fibers protruding from the film surface will also cause the film surface to be rough.

[0005] In addition, due to the small ratio of fiber thickness to membrane thickness, the volume space occupied on the membrane surface is large, which forms structural defects on the surface or inside of the membrane layer, and obviously causes the linkage between the substrate molecules.

[0006] The production of the ground film can be done by hot rolling and hot laminating. Hot laminating is convenient for producing thin thickness. This method is to use the laminating operation or hot film state before, Figure 1As shown, hot rolling is performed by a roller R with a clamping device to restructure the molecular bonds and thin the film to a thinner length. During the rolling process, air exists inside the plant particles 21 contained in the hot film state of the ground film 800. After being rolled by the roller R, the air will flow out, and through the pressure balance and damping factors, the bubbles 22 squeezed out under normal circumstances will be transferred to the surface of the ground film 800, forming a thick defect in the cross section of the ground film 800 to which the bubble 22 belongs, thereby generating a tension weakness, which is not conducive to tensile strength and loses tension strength.

[0007] like Figure 2 As shown, since the plant particles 21 are usually located on the surface of the ground film 800 regardless of whether they are made by blowing or laminating and rolling, the cross section of the ground film 800 occupied by the plant particles 21 also forms a defect in thickness, resulting in a tensile weakness.

[0008] Please refer to Figure 3 As shown, the two adjacent plant fragments 21 inside the ground film 800 occupy a large volume due to their large particle size. The adjacent area of ​​the two plant fragments 21 is located at the horizontal section of the ground film 800, forming a polymerization defect of the ground film 800, and producing a tensile weakness. If the plant fragments 21 are in large quantities, they will be blown apart during the blowing process due to the existence of the above-mentioned weakness. In addition, the plant fragments 21 are large in size. After the ground film 800 degrades and contacts the soil, it still takes time for the conversion to obtain the required nutrient elements, but this time may be delayed beyond the plant maturity and harvest period. Summary of the Invention

[0009] The present invention aims to provide an agricultural nanofilm and its manufacturing method, which can gradually release and / or convert nutrients required by plants according to the degradation level differentiation schedule during agricultural use, and can prevent the photosynthetic growth of weeds.

[0010] The present invention is achieved as follows: a method for manufacturing agricultural nanofilm, characterized in that it includes: a preparation stage, which further includes: (1) taking fertilizer dry particles, nano-catalyzing them into nanofertilizers through a dry nanocatalytic operation, and then storing them; (2) taking plant dry particles, nano-catalyzing them into nanofibers through a dry nanocatalytic operation, and then storing them; (3) taking degradation materials and storing them; a granulation stage, the above-mentioned nanofertilizers, nanofibers, and degradation materials are respectively mixed in proportion through the corresponding mixing operation, and then they are combined to perform a mixing operation, and then they are extruded into strips through a hot melt extrusion operation and pelletized to generate master batches; a film forming stage, taking the above-mentioned master batches and performing a hot melt extrusion operation, and then performing a film coating operation at the end, and then forming them through a film rolling and cooling and shaping operation.

[0011] The volume proportion of the material is as follows: 50-75% of the degradation material; 3-8% of the fertilizer dry particles; and 1-8% of the plant dry particles.

[0012] The mixing operation is performed by mixing the following fillers simultaneously: 0.1-3% of nano calcium oxide and 15-25% of talc.

[0013] The following additional improving agents are mixed simultaneously in the mixing operation: lubricant 0.5-1%; dispersant 0.04-1.2%; chain extender 0.5-3%.

[0014] The average particle size of the fertilizer dry particles and plant dry particles after catalysis by dry nanocatalysis is below 45 microns.

[0015] The degradable material is made of polybutylene terephthalate (PBAT).

[0016] The dry granules of the fertilizer are made from potassium phosphate.

[0017] The plant dry particles are taken from plant stems containing silicon dioxide.

[0018] In the preparation stage, plant carbon particles are added and stored through dry nanocatalysis, with the application ratio being 3-20%.

[0019] In the preparation stage or the mixing operation procedure, nano bamboo carbon is added in a proportion of 2-20%.

[0020] The dry nanocatalytic operation described above utilizes a pressure cylinder to provide processing material inlet and outlet, and utilizes the dry high-speed fluid generated during the process to generate high-speed momentum to perform nanoscale dry catalysis on the processing material.

[0021] An agricultural nano-film is a film made by any of the above-mentioned methods.

[0022] The thickness of the ground film is 0.05-1.2 mm.

[0023] Nano-fertilizers, nano-plant fibers, and / or plant nano-carbon fibers and / or nano-bamboo carbon are uniformly dispersed inside the ground film, and the average particle size of each element is below 45 microns.

[0024] The agricultural nano-mulch film and its manufacturing method of the present invention provide a mulch film and its manufacturing method that can gradually release and / or convert nutrients required by plants according to the degradation level differentiation schedule during agricultural use, and can prevent the photosynthetic growth of weeds. In a preparation stage A, dry fertilizer particles and plant dry particles are subjected to dry pneumatic catalysis to form their particle size into nano-sized particles. They are then mixed with prepared degradable materials in a granulation stage for uniform mixing. Master batches are then produced through a hot melt extrusion process. In a film-forming stage, the master batches are formed into a mulch film by laminating. During agricultural use, the mulch film has the function of gradually releasing nutrients.

[0025] The present invention uses 3-8% of the above-mentioned dry fertilizer granules, 1-8% of plant dry granules, and 50-75% of degradable materials, and is mixed with fillers including talc, nano-calcium oxide, and a large amount of nano-carbon black.

[0026] In the present invention, a dispersant such as a lubricant, a dispersant or a chain extender may be added during the mixing operation.

[0027] The present invention provides for the homogeneity of the particle sizes of the above materials to be below 45 microns.

[0028] The present invention fills more than 2% of nano bamboo carbon in the nano fiber prepared in the preparation stage, and the particle size of the bamboo carbon is less than 45 microns.

[0029] The present invention is characterized in that the degradable material is polybutylene terephthalate (PBAT), the fertilizer dry particles are potassium phosphate, and the plant dry particles are plant stems containing silicon dioxide, such as rice.

[0030] The present invention provides nano-sized carbon black in the preparation stage. After being formed in the granulation stage and the film forming stage, the carbon black has a light blocking effect, thereby preventing the photosynthetic growth of weeds in the area covered by the ground film.

[0031] The present invention is a dry nanocatalytic process that utilizes high-energy fluid and high-speed blades to generate high-speed stirring energy inside a pressure cylinder to perform dry nanocatalysis on the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of commonly used ground film.

[0033] Figure 2 This is one of the structural diagrams of commonly used ground films.

[0034] Figure 3 This is the second structural diagram of the commonly used ground film.

[0035] Figure 4 The present invention is produced by the process diagram.

[0036] Figure 5 This is a simplified diagram of the laminating operation system of the present invention.

[0037] Figure 6 This is one of the process flow diagrams of the present invention.

[0038] Figure 7 This is a schematic diagram of the agricultural use process of the mulch film of the present invention.

[0039] Explanation of symbols:

[0040] Fertilizer Granules 10 Dry Nanocatalysis Operation 11 Stockpiling 12

[0041] Preparation Operation 13 Nanofertilizer 100 First Degradation Level 101

[0042] Second degradation level 102 Third degradation level 103 Fourth degradation level 104

[0043] Plant dry granules 20 Plant crushed granules 21 Bubbles 22

[0044] Nanofiber 200 Degradable Material 30 Degradable Material 300

[0045] Plant carbon particles 40 Nano carbon fiber 400 Mixing operation 50

[0046] Hot melt extrusion operation 60 Cooling 61 Pelletizing operation 62

[0047] Masterbatch 600 Hot melt extrusion operation 70 Feeding head 71

[0048] Laminating operation 80 Cooling and shaping operation 81 Laminating head 82

[0049] Transfer unit 83 Film rolling device 84 Adjustment unit 85

[0050] Cooling device 86 Rewinding device 87 Ground film 800

[0051] Planting 90 Preparation stage A Granulation stage B

[0052] Film Formation Stage C Roller R Nano Bamboo Carbon 201 DETAILED DESCRIPTION

[0053] The present invention provides an agricultural nanofilm and its manufacturing method, which can gradually release and / or convert the nutrients required by plants in accordance with the degradation level differentiation schedule during agricultural use, and can prevent the photosynthetic growth of weeds. The method of making the film of the present invention is as follows: Figure 4 As shown, the process mainly comprises a preparation stage A, a granulation stage B, and a film-forming stage C. In the preparation stage A, fertilizer dry particles 10, plant dry particles 20, and a degradable material 30 are prepared. The degradable material 30 is made of PBAT and stored 12. The fertilizer dry particles 10 are dry materials, and the plant dry particles 20 are crushed plant dry materials. They are respectively subjected to a dry nanocatalysis operation 11 to catalyze their particle sizes to nanoscale, thereby forming nanofertilizer 100 and nanofiber 200, respectively. The dry nanocatalysis operation 11 is operated by high-speed gas impact. After completion, storage 12 is performed separately. The degree of nanoization of each of the above elements is below 45 microns.

[0054] Granulation stage B involves distributing the dry nanofertilizer 100, nanofiber 200, and biodegradable material 30 prepared in the above stages in proportion through a blending operation 13. The blended amounts are obtained from a storage 12 and then collectively subjected to a mixing operation 50. The biodegradable material 30 accounts for 50-75% of the total volume, the nanofiber 200 accounts for 1-8%, and the nanofertilizer 100 accounts for 3-8%. After thorough mixing in the mixing operation 50, a hot melt extrusion operation 60 is performed. The hot melt extrusion operation 60 utilizes a double-tube screw extruder to extrude the mixture into strips. The strips are cooled 61 to form a solid shape, and then pelletized 62 to produce masterbatch 600.

[0055] In a film forming stage C, the master batch 600 is prepared as above, and after a hot melt extrusion operation 70 , a coating operation 80 is performed. After the coating operation 80 undergoes a cooling and setting operation 81 , a ground film 800 is formed.

[0056] During the mixing operation 50 of the granulation stage B, powdered nano-bamboo carbon 201 prepared by dry catalysis can be added at a ratio of 2-20% to perform the mixing operation 50 with the aforementioned elements to complete the co-constructed masterbatch 600.

[0057] The nano bamboo carbon 201 is mixed with the masterbatch 600 during the mixing process as described above. Alternatively, it can be prepared in the same manner as the nano fertilizer 100 during the preparation phase A. Furthermore, since the nano bamboo carbon 201 is not chemically active, it can be dry-mixed in advance into the already accumulated nano fertilizer 100 or nano fiber 200 in a proportional manner.

[0058] The above-mentioned complete masterbatch 600 is used to perform film formation. In the present invention, since the mixed product is nano-sized, in addition to obtaining better flowability during the molding process, it can also provide a thinner ground film 800 (within the force range allowed by the tension of the degradable material 30 after film formation). In addition, in order to make the molecular bonds between the various materials tighter during the shaping process to increase the tension strength, it is suitable to use laminating and rolling methods to produce the ground film 800, wherein the hot melt extrusion operation 70 and the laminating operation 80 are jointly constructed into a film forming device. The process of performing film formation by the relevant equipment is shown below.

[0059] like Figure 5As shown, the hot melt extrusion operation 70 obtains the above-mentioned masterbatch 600 through hot melting, and then a feeding head 71 generates pressure to perform a coating operation 80. The coating operation 80 uses a coating head 82 to form a bare strip of ground film 800 rough blank. The rough blank is transferred to a film rolling device 84 through a transfer unit 83. The film rolling device 84 uses a rolling method. The mutual gap between the rollers R is adjusted by an adjustment unit 85 to pre-determine the thickness of the ground film 800 in the process. It is then sealed by a cooling and shaping operation 81. The cooling and shaping operation 81 can use the cooling device 86 to balance the temperature or blow away the heat to form a temperature drop heat treatment operation, thereby making the molecular structure of the ground film 800 more stable. Finally, a winding device 87 is used to perform winding, that is, to form the ground film 800 for the purpose of the present invention, and its forming thickness is between 0.05 and 1.2 mm.

[0060] Please refer to Figure 6 As shown, in the process of the production method of the present invention, plant carbon black can be added and mixed. The material used is plant carbon particles 40, which are also nano-catalyzed into nano-carbon fibers 400 at a ratio of 3 to 20% through the dry nano-catalytic operation 11 of dry fluid catalysis. The nano-carbon fibers 400 have the same or similar size as the nano-fertilizer 100 and the nano-planted fiber 200. After completion, the nano-fertilizer 100 and the nano-planted fiber 200 enter a storage 12. In the granulation stage B operation process, the nano-fertilizer 100, the nano-planted fiber 200 and the degradable material 30 are mixed by the mixing operation 13 at about 3 to 8%. Figure 4 After the proportions in the mixture enter the mixing operation 50, the granulation stage B is reached and the masterbatch 600 is obtained. Figure 4 In the film-forming stage C, hot melt extrusion operation 70 and coating operation 80 are performed to form a ground film 800 mixed with nano-sized plant carbon particles 40. The plant carbon particles 40 are nano-sized into nano-carbon fibers 400, and a material ratio of 3-20% is uniformly dispersed in a large amount within the generated ground film 800 to produce an anti-refraction function. The nano-carbon fibers 400 can block the refraction of sunlight, making it difficult for weed seedlings in the soil covering the bottom surface to carry out photosynthesis, thereby inhibiting weed growth. The black color can act as a light absorber to assist in absorbing solar heat energy, so that the temperature under the ground film is heated and maintained to facilitate plant growth, especially in winter or cold areas.

[0061] The main purpose of the above-mentioned nano carbon fiber 400 filled with a large proportion is to block sunlight to inhibit the growth of weeds on the covered ground. Figure 4 When the proportion of the nano bamboo carbon 201 added thereto is high, the nano bamboo carbon 201 is carbon black in nature and has the ability to block sunlight refraction, so the proportion of the nano carbon fiber 400 can be reduced.

[0062] Please refer to Figure 7As shown, when the ground film 800 completed by the present invention is used in agriculture, the shady side covers the surface of the plant soil 90, and the degradable material 300 contained in the ground film 800 is eroded by the bacteria contained in the plant soil 90, and undergoes tissue differentiation and degradation into water and carbon dioxide.

[0063] The progressive erosion is defined as a first degradation level 101 , a second degradation level 102 , a third degradation level 103 , and a fourth degradation level 104 .

[0064] The ground film 800 is essentially made of a degradable material 300 containing a large number of dispersed nanofibers 200 and nanofertilizers 100. The nanofibers 200 and nanofertilizers 100 are degraded in sequence according to the thickness of the ground film 800, following the first degradation layer 101, the second degradation layer 102, the third degradation layer 103, the fourth degradation layer 104, etc. At first, the nanofertilizers 100 contained in the first degradation layer 101 are degraded and released into the soil according to the degradation process. At this time, the nanofertilizers 100 above the second degradation layer 102 of the ground film 800 are degraded. The nanofertilizer 100 and nanofiber 200 inside the first degradation layer 100 remain in place. After the first degradation layer 101 is degraded and eliminated according to the first time schedule, it enters the second degradation layer 102. The nanofertilizer 100 and nanofiber 200 contained in the second degradation layer 102 are also decomposed and released into the soil, and then the third degradation layer 103 and the fourth degradation layer 104..., the nanofertilizer 100 and nanofiber 200 contained in each layer are released one by one into the soil 90 according to the divergent time schedule to be absorbed by the plant roots or converted into nutrients. The mulch film 800 of the present invention can meet the needs of plant growth, so the mulch film 800 of the present invention will gradually release the nano fertilizer 100 and the nano fiber 200 layer by layer according to the degradation level and time in the process of providing agricultural use. In the process of providing agricultural planting with the mulch film 800, there is no need to apply the fertilizer of the present invention to the planting soil 90. The nano fiber 200 contained in each layer will also penetrate into the planting soil 90 in sequence and be converted into plant nutrients through chemical combination. Specifically, it can be seen that the mulch film 800 of the present invention will gradually release the nano fertilizer 100 and the nano fiber 200 layer by layer according to the time of agricultural planting. The nanofertilizer 100, nanofiber 200, and / or nanocarbon fiber 400 are nano-sized into fine particles and penetrate into the soil. They are easily absorbed by the soil components and quickly converted. They are easily absorbed by the roots of plants and driven by water or water vapor. They can be easily dispersed and distributed in the soil. They will not cause previous defects on the surface of the ground film 800 and affect the mechanical tension of the ground film 800.

[0065] The biodegradable material primarily utilizes polybutylene terephthalate (PBAT), a biodegradable thermoplastic compound whose flexibility and tensile strength can be improved by adding additives. PBAT, under aerobic conditions, especially in open fields, has ample sunlight, moisture, and microorganisms, which facilitates its complete degradation or biocomposting, making it suitable for use as agricultural mulch.

[0066] The plant dry particles 20 may be plant stems containing silicon dioxide, such as rice grains and rice straw. Silica has a nano-hair microstructure on a microscopic level, which can prick or stimulate the insect surface, thereby achieving an inhibitory insect repellent effect.

[0067] exist Figure 4 or Figure 6 In the figure, the program performs a filler addition in the mixing operation 50. The filler is nano calcium oxide with a ratio of 0.1-3%, talc powder 15-25%, and an improver can be added according to the requirements of the film forming mechanical strength, the laminating operation environment and the conditions of the equipment. The improver is a lubricant 0.5-1%, a dispersant 0.04-1.2%, and a chain extender 0.5-3%.

[0068] In the preparation phase A, the complete dry nano-bamboo carbon is mixed in a mixing operation 50 in a ratio of 2-20% and a particle size of less than 45 microns.

[0069] In addition to providing a new functional ground film, the present invention utilizes the material state during production, coupled with a dry nano-processing process, to achieve rapid material preparation and film formation, significantly reducing the flow resistance of hot-melt materials. The dry nano-processing process is a processing equipment system that utilizes high-speed fluid physics and mechanical momentum to break down visible granular materials into nano-scale particles using high kinetic energy. The system has a working axis of rotation. A prime mover shaft is positioned along the axis of rotation. The prime mover shaft drives a flow cylinder into a pressure generating unit. An inlet is provided at one end of the flow cylinder to receive the particulate material to be processed. The processed material is transferred through the flow cylinder into the working area of ​​a booster impeller. The flow cylinder radially drives the booster impeller, and the entire system operates within a rigid pressure cylinder. The pressure cylinder has a radial working surface and a discharge outlet leading outward.

[0070] Specifically, the system utilizes a power element to drive a pressure generating unit. A circular chamber-shaped pressure cylinder is disposed within the pressure generating unit along the system's rotational axis. A discharge outlet is provided at one point on the circumference of the pressure cylinder, and a flow guide shaft is disposed within the unit, the centerline of which overlaps with the rotational axis. The flow guide shaft is radially coupled to a booster impeller, and the entire unit is coaxially located within the pressure cylinder. A suction port is disposed at one end of the flow guide shaft, and radially extending pressure-activated slots are provided on the outer circumference of the suction port to connect to the booster impeller space. The workpiece is drawn into the pressure cylinder through the suction port by the pressure within the pressure cylinder. The high and low pressure differences in the airflow generated within the pressure cylinder, the high-speed airflow even reaching a critical state at the speed of sound, and the momentum generated by mechanical operation combine to perform a variety of physical operations on the processed material particles, effectively breaking down the material (raw material) to be processed, which has a visible particle size, into nanometer-scale particles. The material is dry and can be organic or inorganic.

[0071] The present invention utilizes a dry nano-processing process during the preparation stage to process fertilizer and plant dry particles, and then incorporates plant carbon fragments. This allows the resulting mulch film to have the unique functions of absorbing heat, blocking light, and gradually releasing fertilizer elements. The tension of the mulch film can be precisely maintained, allowing it to be stretched and laid flat during installation, thus creating an innovative mulch film production process.

Claims

1. A method for manufacturing agricultural nanofilm, characterized in that It contains: A preparation phase, which further includes: (1) Dry fertilizer particles are taken and converted into nanofertilizers through a dry nanocatalytic process and then stored; (2) Plant dry particles containing silicon dioxide are taken as materials, and nanofibers are converted into nanofibers through a dry nanocatalytic process and then stored; (3) Obtaining degradable materials and stockpiling them; The volume ratio of the materials is as follows: 50-75% of the degradable materials; 3-8% of the fertilizer particles; and 1-8% of the plant particles. In a granulation stage, the aforementioned nanofertilizer, nanofiber, and biodegradable material are mixed in their respective proportions after blending. Nanosized plant carbon (3-20% by volume), nano-calcium oxide (0.1-3%), and talc (15-25%) are then added and mixed simultaneously. The mixture is then hot-melt extruded into strips and pelletized to produce masterbatch. In the first film-forming stage, the masterbatch is subjected to a hot-melt extrusion operation, and a coating operation is performed at the end. After the film is rolled and de-bubbled by a film rolling device, it is cooled and shaped.

2. The method for producing agricultural nanofilm according to claim 1, characterized in that The following additional improving agents are mixed simultaneously in the mixing operation: the volume ratio of lubricant is 0.5-1%, the volume ratio of dispersant is 0.04-1.2%, and the volume ratio of chain extender is 0.5-3%.

3. The method for manufacturing agricultural nanofilm according to claim 1, wherein the average particle size of the fertilizer dry particles and plant dry particles after catalysis by dry nanocatalysis is less than 45 microns.

4. The method for manufacturing agricultural nanofilm according to claim 1, characterized in that The biodegradable material is made from polybutylene terephthalate (PBAT).

5. The method for manufacturing agricultural nanofilm according to claim 1, wherein the dry granular fertilizer is potassium phosphate.

6. The method for manufacturing agricultural nanofilm according to claim 1, characterized in that During the preparation stage or mixing operation, nano bamboo carbon is added at a ratio of 2 to 20% to increase the content of silica elements.

7. The method for manufacturing agricultural nanofilm according to claim 1, characterized in that The dry nanocatalytic operation utilizes a pressure cylinder to provide processing material inlet and outlet, and utilizes the dry high-speed fluid generated during the process to generate high-speed momentum to perform nano-scale dry catalysis on the processing material.

8. An agricultural nanofilm, characterized by being a film made by the manufacturing method according to any one of claims 1 to 7.

9. The agricultural nanofilm according to claim 8, characterized in that The thickness of the ground film is 0.05 to 1.2 mm.

10. The agricultural nano-mulch film according to claim 8, wherein nano-fertilizers, nano-plant fibers, and / or plant nano-carbon fibers and / or nano-bamboo carbon are uniformly dispersed within the film, and the average particle size of each element is less than 45 microns.

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